WO2011080216A1 - Unit for monitoring particles - Google Patents

Unit for monitoring particles Download PDF

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Publication number
WO2011080216A1
WO2011080216A1 PCT/EP2010/070652 EP2010070652W WO2011080216A1 WO 2011080216 A1 WO2011080216 A1 WO 2011080216A1 EP 2010070652 W EP2010070652 W EP 2010070652W WO 2011080216 A1 WO2011080216 A1 WO 2011080216A1
Authority
WO
WIPO (PCT)
Prior art keywords
measuring unit
particles
window
unit according
housing
Prior art date
Application number
PCT/EP2010/070652
Other languages
French (fr)
Inventor
Klas Gøran ERIKSSON
Original Assignee
Aker Subsea As
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Aker Subsea As filed Critical Aker Subsea As
Publication of WO2011080216A1 publication Critical patent/WO2011080216A1/en

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
    • G01N15/02—Investigating particle size or size distribution
    • G01N15/0205—Investigating particle size or size distribution by optical means, e.g. by light scattering, diffraction, holography or imaging
    • G01N15/0227—Investigating particle size or size distribution by optical means, e.g. by light scattering, diffraction, holography or imaging using imaging, e.g. a projected image of suspension; using holography
    • G01N15/1433—
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
    • G01N15/10—Investigating individual particles
    • G01N15/14—Electro-optical investigation, e.g. flow cytometers
    • G01N2015/1493—Particle size
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
    • G01N15/10—Investigating individual particles
    • G01N15/14—Electro-optical investigation, e.g. flow cytometers
    • G01N2015/1497—Particle shape
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/01—Arrangements or apparatus for facilitating the optical investigation
    • G01N21/15—Preventing contamination of the components of the optical system or obstruction of the light path
    • G01N2021/154—Ultrasonic cleaning
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/47—Scattering, i.e. diffuse reflection
    • G01N21/49—Scattering, i.e. diffuse reflection within a body or fluid
    • G01N21/53—Scattering, i.e. diffuse reflection within a body or fluid within a flowing fluid, e.g. smoke

Definitions

  • This invention relates to a measuring unit for monitoring particles in a fluid flow, wherein the particles may be constituted by solid or liquid materials dispersed in a fluid flow.
  • the present invention provides a solution where the imaged volume of a fluid flow containing hydrocarbons is illuminated at an angle from the same side of the pipe as the camera, preferably providing so-called dark field images of the flow volume.
  • a measuring unit is obtained capable of measuring particles such as oil droplet and solid particles concentrations separately.
  • the unit according to the invention provides an improvement when used in pipes or pipelines in subsea or downhole situations as the unit only requires one hole in the pipe, and being positioned flush to the pipe wall so as not to disturb the fluid flow.
  • the unit is provided with means for reducing or removing deposits on the window, by coating on the window surface and/or with means for cleaning the window.
  • Figure 1 illustrates schematically the unit installed in a pipe.
  • FIG. 2 illustrated the measuring unit according to the preferred embodiment of the invention.
  • Figure 3 illustrates the measurements provided by the unit for monitoring particle sizes.
  • Figure 4 illustrates a means for cleaning the window of the unit.
  • the unit 1 may be positioned in a standard opening in the pipe wall 3 and is provided with a window 2.
  • the window material may be of any type suitable to the light used in the measurements, but preferably it is made from sapphire or similar in order to withstand the erosion from the particles in the flow as well as wear from processes cleaning the window.
  • the housing of the measuring unit 1 may be of any suitable metal being compatible with the pipe material and expected flow content.
  • a typical use as an oil and solid particle sensor is in 6" pipes containing injection water to be pumped into subsea oil wells.
  • the housing and corresponding mount in the pipe wall is adapted to position the window
  • the shape of the window may be either plane and positioned essentially flush with the wall surface, as illustrated in the drawing, or may be curved. In the latter case the optical means may have to compensate for the effects of the refraction in the window, e.g. by additional cylindrical lenses and/or by controlling the direction of the light sources.
  • the functional parts of the measuring unit is illustrated in figure 2.
  • the measuring unit 1 comprises a window 2 and a camera 6 with a lens adapted to provide images of a defined volume in the flow outside the window.
  • the volume is defined by the focus of the lens or objective 5, both is focusing at a chosen distance and the depth of field of the lens at the chosen distance and aperture.
  • the camera 6 is preferably a digital camera being able to sample images at a sufficiently high rate and with sufficient resolution to provide images of particles in sizes in the micrometer range, typically being within the range of 1-100 ⁇ .
  • the camera and lens constitutes a microscope camera and the illumination provides a dark field illumination.
  • Preferably light with wavelengths shorter than 550nm are used, especially in the range of 500-550nm but 450-480nm may also be contemplated depending on the light source.
  • a LED may be useful in order to provide short switching time and thus sharp images of the particles, droplets and other and objects in the flow.
  • the illustration shows the preferred embodiment with one window covering both the light sources and camera, but it is possible to split the window having window parts over the light sources and camera.
  • the window or window parts may also have optical features acting as lenses, e.g. for directing the light from the light sources.
  • the illustrated measuring unit 1 also includes two light sources 4a,4b being positioned on both sides of the camera 6 and thus illuminating the chosen volume at an angle relative to the camera optical axis.
  • the light sources may provide continuous lighting or flashes synchronized with the sampling of the camera 6.
  • the number of light sources may vary depending on the situation and application, e.g. on the required light intensity and the lens aperture.
  • the light source or sources 4a,4b may constitute of sections around the camera of different sizes depending on the required effect and light intensity, but larger sections up to 180° will be advantageous both for side illumination and contrast.
  • the light sources may be positioned close to the window or the light may be transmitted through a light guide toward the wanted position.
  • a single light source encircling the camera may of course also be used, or a tube shaped light guide distributing the light in a 360 degree section from one or more light sources.
  • the measuring unit also includes an electronic unit 7 for storing and/or processing the sampled data, for providing power supply and possibly also having connectors 8 for communicating with e.g. other instruments or onshore control systems, or a power supply.
  • the measuring unit will sample a number of images, and the number of drops and/or solid particles are counted.
  • the sampling may be at a constant monitoring the number of particles in each image and noticing an increase or the sampling is performed until a predetermined number of images or a predetermined number of particles are counted, and the sampled information is analyzed.
  • the shape of the particles may be observed using the microscope camera and dark field illumination, and analyzed.
  • jagged shapes indicate solids while round shapes indicate liquid droplets, which is useful when used for monitoring e.g. a water flow used for injection into a reservoir.
  • This shape analysis is based on the solution described in the abovementioned US patent and will not be discussed in detail here.
  • the well injectivity When injecting water into a reservoir, the well injectivity can be damaged by excessive oil droplets or solids content. (Dissolved hydrocarbons do not affect the injectivity of the well to any large extent). Injectivity damage by excessive oil droplet content is often reversible by injecting with clean water over time, while damage by solids can be non-reversible, requiring a costly well intervention to remedy.
  • the allowable ppm limits of solids is normally lower than the allowable limits of oil droplets, and will depend on the application and the materials used in the components in the system. For water injection it is therefore of importance to be able to determine the concentration of oil droplets and solids separately and independently
  • the device can also be used with a wet gas compressor, in order to measure the amount of liquid droplets entering the compressor.
  • the device can be used to provide the size distribution of the droplets.
  • a gas compressor can tolerate several percent of liquid content at the inlet providing the droplets are small, for example in the range of 5% liquid with ⁇ droplets, but only down to 0.05% liquid if the droplets are larger, e.g. up to ⁇ , and thus have more momentum when colliding with the pump. Thus it is an object to measure and classify the size of the droplets in the flow..
  • the measuring unit according to the invention may also be used to characterize the flow conditions by finding the size and mass distribution of the droplets in the flow.
  • Figure 3 illustrates a measured result where the distribution of the numbers of particles having sizes in (micrometers) and weight in (micro gram) is shown, which may be used when monitoring the content of injection water to be pumped into a well, e.g. making it possible to adjust or stop the separator separating oil from the water.
  • the measuring unit may be cleaned by removing it from the pipe, but e.g. in subsea installations this may be complicated and expensive. Thus methods for cleaning the window on location may be used.
  • FIG 4 one possible cleaning method is shown where the window is flushed with high pressure methanol.
  • the methanol is provided with a tool 9 coupled to a flushing nozzle and solenoid valve 10 and being positioned immediately downstream from the window 2 so as not to disturb the flow 11 during normal application, and may be installed through the same opening in the pipe or a separate opening close by.
  • the flushing may be activated manually or may be performed automatically if deposits are detected on the window. This detection may be performed by detecting e.g. loss in contrast, constant dark areas in the images etc.
  • Alternative cleaning methods may be based on optical cleaning means, e.g. using a high power laser aimed at the window either from inside or outside the housing, or insonifying the window either by vibrating the window at ultrasonic frequencies with a transducer coupled to the window or transmitting ultrasonic waves toward the window.
  • optical cleaning means e.g. using a high power laser aimed at the window either from inside or outside the housing, or insonifying the window either by vibrating the window at ultrasonic frequencies with a transducer coupled to the window or transmitting ultrasonic waves toward the window.

Abstract

This invention relates to a measuring unit for monitoring particles in a fluid flow, the unit comprising a housing being adapted to be mounted in a pipe wall with a first end being in contact with the fluid flow, the first end including a window, the housing comprising a camera positioned within the housing, the camera being aimed at a chosen volume through the window and being connected to an electronics unit for sampling and analyzing means for analyzing the sampled images for registering particles in said volume. The measuring unit also comprising at least one light source positioned within the housing and being adapted to illuminate the chosen volume.

Description

UNIT FOR MONITORING PARTICLES
This invention relates to a measuring unit for monitoring particles in a fluid flow, wherein the particles may be constituted by solid or liquid materials dispersed in a fluid flow.
In fluid flows the existence of particles may give raise to problems relates to wear and damages on equipment present in the flow, such as pumps, and also the presence of a certain amount of liquid drops in the flow may be an indication that e.g. an upstream separator or sand filter needs adjusting or repairs. Also, environmental concerns put limitations to the content of such things as injection water being pumped into subsea oil wells where the injection water is separated from oil and there is a need for detecting and classifying oil drops in the flow. Another use is for liquid content monitoring in gas compressors where the longevity of the compressor may be reduced if a large amount of liquid droplets are present in the flow. However, large droplets are more harmful than small ones, such that the size distribution also affects the longevity of the compressor.
An example illustrating a system for acquiring images of particles in a flow is discussed in US5815264, wherein a probe is positioned inside the fluid flow so as to provide images of any particles present in the flow. Although the system does provide sample images making it possible to determine characteristics such as shape, size and number of particles is does not provide an automated system where the particles are categorized based on the measured characteristics so that a monitoring of the flow is possible. Also, the probe has the disadvantage that it is preferably put into the flow centre so as to avoid material deposits on the pipe wall, but with the disadvantage in erosion on the window surface. A similar system for analyzing blood streams is shown in US5791345.
Thus it is an object of the present invention to provide a unit capable of monitoring a fluid flow containing hydrocarbons and possibly including particles such as sand, being capable of discriminating between solid and liquid particles to any large degree. A better system is discussed in US7162057 where a camera is used to provide images of the particles in the flow and analyze these images in order to investigate the nature of the particles. For some types of fluids and particles the solution in US7162057 has the disadvantage of low contrast. Thus it is an object of the present invention to monitor the particle content in a fluid flow by sampling images of the flow content where the images has an improved contrast. This is obtained using the measuring unit mentioned above and preferably based on the methods discussed in US7162057 although corresponding methods may also be used, and characterized as stated in the independent claim.
Thus the present invention provides a solution where the imaged volume of a fluid flow containing hydrocarbons is illuminated at an angle from the same side of the pipe as the camera, preferably providing so-called dark field images of the flow volume. Preferably at least two light sources are positioned symmetrically around the camera. Thus a measuring unit is obtained capable of measuring particles such as oil droplet and solid particles concentrations separately.
In addition to the improved contrast the unit according to the invention provides an improvement when used in pipes or pipelines in subsea or downhole situations as the unit only requires one hole in the pipe, and being positioned flush to the pipe wall so as not to disturb the fluid flow. Preferably the unit is provided with means for reducing or removing deposits on the window, by coating on the window surface and/or with means for cleaning the window.
The invention will be described below with reference to the accompanying drawings illustrating the invention by way of examples.
Figure 1 illustrates schematically the unit installed in a pipe.
Figure 2 illustrated the measuring unit according to the preferred embodiment of the invention.
Figure 3 illustrates the measurements provided by the unit for monitoring particle sizes.
Figure 4 illustrates a means for cleaning the window of the unit.
As indicated by figure 1 the unit 1 may be positioned in a standard opening in the pipe wall 3 and is provided with a window 2. The window material may be of any type suitable to the light used in the measurements, but preferably it is made from sapphire or similar in order to withstand the erosion from the particles in the flow as well as wear from processes cleaning the window. The housing of the measuring unit 1 may be of any suitable metal being compatible with the pipe material and expected flow content. A typical use as an oil and solid particle sensor is in 6" pipes containing injection water to be pumped into subsea oil wells.
In order to reduce both erotion on the window and disturbances in the flow the housing and corresponding mount in the pipe wall is adapted to position the window
2 flush with the inner surface of the pipe wall 3. The shape of the window may be either plane and positioned essentially flush with the wall surface, as illustrated in the drawing, or may be curved. In the latter case the optical means may have to compensate for the effects of the refraction in the window, e.g. by additional cylindrical lenses and/or by controlling the direction of the light sources.
The functional parts of the measuring unit is illustrated in figure 2. The measuring unit 1 comprises a window 2 and a camera 6 with a lens adapted to provide images of a defined volume in the flow outside the window. The volume is defined by the focus of the lens or objective 5, both is focusing at a chosen distance and the depth of field of the lens at the chosen distance and aperture. The camera 6 is preferably a digital camera being able to sample images at a sufficiently high rate and with sufficient resolution to provide images of particles in sizes in the micrometer range, typically being within the range of 1-100μιη. According to the preferred embodiment of the invention the camera and lens constitutes a microscope camera and the illumination provides a dark field illumination. Preferably light with wavelengths shorter than 550nm are used, especially in the range of 500-550nm but 450-480nm may also be contemplated depending on the light source. A LED may be useful in order to provide short switching time and thus sharp images of the particles, droplets and other and objects in the flow.
The illustration shows the preferred embodiment with one window covering both the light sources and camera, but it is possible to split the window having window parts over the light sources and camera. The window or window parts may also have optical features acting as lenses, e.g. for directing the light from the light sources.
The illustrated measuring unit 1 also includes two light sources 4a,4b being positioned on both sides of the camera 6 and thus illuminating the chosen volume at an angle relative to the camera optical axis. The light sources may provide continuous lighting or flashes synchronized with the sampling of the camera 6. The number of light sources may vary depending on the situation and application, e.g. on the required light intensity and the lens aperture. The light source or sources 4a,4b may constitute of sections around the camera of different sizes depending on the required effect and light intensity, but larger sections up to 180° will be advantageous both for side illumination and contrast. The light sources may be positioned close to the window or the light may be transmitted through a light guide toward the wanted position. A single light source encircling the camera may of course also be used, or a tube shaped light guide distributing the light in a 360 degree section from one or more light sources.
The measuring unit also includes an electronic unit 7 for storing and/or processing the sampled data, for providing power supply and possibly also having connectors 8 for communicating with e.g. other instruments or onshore control systems, or a power supply.
In use the measuring unit will sample a number of images, and the number of drops and/or solid particles are counted. The sampling may be at a constant monitoring the number of particles in each image and noticing an increase or the sampling is performed until a predetermined number of images or a predetermined number of particles are counted, and the sampled information is analyzed.
For use as a sensor monitoring the amount of oil drops and/or solids in a flow the shape of the particles may be observed using the microscope camera and dark field illumination, and analyzed. In this analysis observed jagged shapes indicate solids while round shapes indicate liquid droplets, which is useful when used for monitoring e.g. a water flow used for injection into a reservoir. This shape analysis is based on the solution described in the abovementioned US patent and will not be discussed in detail here.
When injecting water into a reservoir, the well injectivity can be damaged by excessive oil droplets or solids content. (Dissolved hydrocarbons do not affect the injectivity of the well to any large extent). Injectivity damage by excessive oil droplet content is often reversible by injecting with clean water over time, while damage by solids can be non-reversible, requiring a costly well intervention to remedy. The allowable ppm limits of solids is normally lower than the allowable limits of oil droplets, and will depend on the application and the materials used in the components in the system. For water injection it is therefore of importance to be able to determine the concentration of oil droplets and solids separately and independently
The device can also be used with a wet gas compressor, in order to measure the amount of liquid droplets entering the compressor. At the same time, the device can be used to provide the size distribution of the droplets. A gas compressor can tolerate several percent of liquid content at the inlet providing the droplets are small, for example in the range of 5% liquid with Ιμιη droplets, but only down to 0.05% liquid if the droplets are larger, e.g. up to ΙΟΟμιη, and thus have more momentum when colliding with the pump. Thus it is an object to measure and classify the size of the droplets in the flow..
The measuring unit according to the invention may also be used to characterize the flow conditions by finding the size and mass distribution of the droplets in the flow. Figure 3 illustrates a measured result where the distribution of the numbers of particles having sizes in (micrometers) and weight in (micro gram) is shown, which may be used when monitoring the content of injection water to be pumped into a well, e.g. making it possible to adjust or stop the separator separating oil from the water. As the measuring unit is to be used in environments containing oil, solid particles etc there may accumulate on the window after a period of use. The measuring unit may be cleaned by removing it from the pipe, but e.g. in subsea installations this may be complicated and expensive. Thus methods for cleaning the window on location may be used. In figure 4 one possible cleaning method is shown where the window is flushed with high pressure methanol. The methanol is provided with a tool 9 coupled to a flushing nozzle and solenoid valve 10 and being positioned immediately downstream from the window 2 so as not to disturb the flow 11 during normal application, and may be installed through the same opening in the pipe or a separate opening close by.
The flushing may be activated manually or may be performed automatically if deposits are detected on the window. This detection may be performed by detecting e.g. loss in contrast, constant dark areas in the images etc.
Alternative cleaning methods may be based on optical cleaning means, e.g. using a high power laser aimed at the window either from inside or outside the housing, or insonifying the window either by vibrating the window at ultrasonic frequencies with a transducer coupled to the window or transmitting ultrasonic waves toward the window.

Claims

C l a i m s
1. Measuring unit for monitoring particles such as solid particles and droplets in a fluid flow, the unit comprising a housing being adapted to be mounted in a pipe wall with a first end being in contact with the fluid flow, the first end including a window, the housing comprising a camera positioned within the housing, the camera being aimed at a chosen volume through the window and being connected to an electronics unit for sampling and analyzing means for analyzing the sampled images for registering particles in said volume, the measuring unit also comprising at least one light source positioned within the housing and being adapted to illuminate the chosen volume, wherein the unit is adapted to be positioned in a hydrocarbon flow and said window being positioned essentially flush with the inner pipe wall and said analyzing means being adapted to categorize said particles as fluid or solid material.
2. Measuring unit according to claim 1, including at least two light sources directed toward the chosen volume.
3. Measuring unit according to claim 2, wherein the light sources are positioned symmetrically around the camera.
4. Measuring unit according to claim 2, wherein the light sources is adapted to provide dark field illumination in the chosen volume.
5. Measuring unit according to claim 1, wherein the analyzing means is adapted to recognize and count the number of particles in each image, the measuring unit being adapted to sampling images until a predetermined number of particles have been detected.
6. Measuring unit according to claim 1, wherein the analyzing means is adapted to recognize predetermined particle characteristics, thus categorizing the detected particles, e.g. as liquid droplets or sand particles from their measured shapes or sizes.
7. Measuring unit according to claim 1, wherein the camera is constituted by a microscope with an image sensor.
8. Measuring unit according to claim 1, also comprising a flushing unit positioned outside the housing and being adapted to flush a fluid, e.g. methanol, at high pressure toward the window for cleaning.
9. Measuring unit according to claim 1, comprising an acoustic transducer for insonifying the window thus to remove contaminations there from.
10. Measuring unit according to claim 1, comprising an optical power laser device for cleaning the window from inside the device.
PCT/EP2010/070652 2009-12-29 2010-12-23 Unit for monitoring particles WO2011080216A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO20093598A NO20093598A1 (en) 2009-12-29 2009-12-29 Optical particle templates
NO20093598 2009-12-29

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WO2011080216A1 true WO2011080216A1 (en) 2011-07-07

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Cited By (4)

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Publication number Priority date Publication date Assignee Title
NL2010538C2 (en) * 2013-03-28 2014-09-30 Ihc Syst Bv Measurement device for performing measurement on a mixture of water and collected material.
US20160041376A1 (en) * 2013-08-17 2016-02-11 Clearview Subsea Llc System and method for measuring oil content in water using laser-induced fluorescent imaging
US9382921B2 (en) 2009-12-29 2016-07-05 Aker Subsea As Control of subsea compressors
CN113960037A (en) * 2021-10-23 2022-01-21 新乡市中誉鼎力软件科技股份有限公司 Detection equipment and detection system for raw stone in sandstone aggregate production

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US5641972A (en) * 1994-01-13 1997-06-24 Sextant Avionique Method and a sensor for measuring the content of water in the liquid state in a moving gas
US5791345A (en) 1993-09-03 1998-08-11 Toa Medical Electronics Co., Ltd. Non-invasive blood analyzer
US5815264A (en) 1994-09-21 1998-09-29 Laser Sensor Technology, Inc System for acquiring an image of a multi-phase fluid by measuring backscattered light
GB2371858A (en) * 2001-02-05 2002-08-07 Abb Offshore Systems Ltd Monitoring particles in a fluid flow
US7162057B1 (en) 1999-02-05 2007-01-09 Jorin Limited Apparatus for and method of monitoring particulate material in a fluid
WO2009134145A1 (en) * 2008-04-30 2009-11-05 Proanalysis As Acoustic cleaning of optical probe window

Patent Citations (6)

* Cited by examiner, † Cited by third party
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US5791345A (en) 1993-09-03 1998-08-11 Toa Medical Electronics Co., Ltd. Non-invasive blood analyzer
US5641972A (en) * 1994-01-13 1997-06-24 Sextant Avionique Method and a sensor for measuring the content of water in the liquid state in a moving gas
US5815264A (en) 1994-09-21 1998-09-29 Laser Sensor Technology, Inc System for acquiring an image of a multi-phase fluid by measuring backscattered light
US7162057B1 (en) 1999-02-05 2007-01-09 Jorin Limited Apparatus for and method of monitoring particulate material in a fluid
GB2371858A (en) * 2001-02-05 2002-08-07 Abb Offshore Systems Ltd Monitoring particles in a fluid flow
WO2009134145A1 (en) * 2008-04-30 2009-11-05 Proanalysis As Acoustic cleaning of optical probe window

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9382921B2 (en) 2009-12-29 2016-07-05 Aker Subsea As Control of subsea compressors
NL2010538C2 (en) * 2013-03-28 2014-09-30 Ihc Syst Bv Measurement device for performing measurement on a mixture of water and collected material.
WO2014158024A1 (en) 2013-03-28 2014-10-02 Ihc Systems B.V. Measurement device for performing measurement on a mixture of water and collected material
CN105143561A (en) * 2013-03-28 2015-12-09 Ihc系统股份有限公司 Measurement device for performing measurement on a mixture of water and collected material
US10060092B2 (en) 2013-03-28 2018-08-28 Ihc Holland Ie B.V. Measurement device for performing measurement on a mixture of water and collected material
US20160041376A1 (en) * 2013-08-17 2016-02-11 Clearview Subsea Llc System and method for measuring oil content in water using laser-induced fluorescent imaging
CN113960037A (en) * 2021-10-23 2022-01-21 新乡市中誉鼎力软件科技股份有限公司 Detection equipment and detection system for raw stone in sandstone aggregate production

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