CA2292401A1 - Method and apparatus for detecting low light levels - Google Patents

Method and apparatus for detecting low light levels Download PDF

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Publication number
CA2292401A1
CA2292401A1 CA002292401A CA2292401A CA2292401A1 CA 2292401 A1 CA2292401 A1 CA 2292401A1 CA 002292401 A CA002292401 A CA 002292401A CA 2292401 A CA2292401 A CA 2292401A CA 2292401 A1 CA2292401 A1 CA 2292401A1
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CA
Canada
Prior art keywords
low light
integration
light levels
detecting low
photo diode
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
CA002292401A
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French (fr)
Other versions
CA2292401C (en
Inventor
Morten J. Jensen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Caliper Life Sciences Inc
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Individual
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 Individual filed Critical Individual
Publication of CA2292401A1 publication Critical patent/CA2292401A1/en
Application granted granted Critical
Publication of CA2292401C publication Critical patent/CA2292401C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J1/00—Photometry, e.g. photographic exposure meter
    • G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
    • G01J1/44—Electric circuits
    • G01J1/46—Electric circuits using a capacitor
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J1/00—Photometry, e.g. photographic exposure meter
    • G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
    • G01J1/44—Electric circuits

Abstract

A method and apparatus (400) for measuring very low light signals including integrating a signal from a photo diode (130), avalanche photo diode, photomultiplier tube or the like, digitally sampling the integrator output (210) more than two times during each integration period, fitting a curve to the multiple digitized readings (530) to calculate the integration slope (510, 530) for each integration period and determining the original signal from the calculated integration slope.
CA002292401A 1997-06-27 1998-06-26 Method and apparatus for detecting low light levels Expired - Fee Related CA2292401C (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
US5110297P 1997-06-27 1997-06-27
US60/051,102 1997-06-27
US09/104,813 1998-06-25
US09/104,813 US5959291A (en) 1997-06-27 1998-06-25 Method and apparatus for measuring low power signals
PCT/US1998/013329 WO1999000649A1 (en) 1997-06-27 1998-06-26 Method and apparatus for detecting low light levels

Publications (2)

Publication Number Publication Date
CA2292401A1 true CA2292401A1 (en) 1999-01-07
CA2292401C CA2292401C (en) 2006-08-01

Family

ID=26729063

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002292401A Expired - Fee Related CA2292401C (en) 1997-06-27 1998-06-26 Method and apparatus for detecting low light levels

Country Status (8)

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US (4) US5959291A (en)
EP (1) EP0991923B9 (en)
JP (1) JP2002508063A (en)
AT (1) ATE362095T1 (en)
AU (1) AU734271B2 (en)
CA (1) CA2292401C (en)
DE (1) DE69837757T2 (en)
WO (1) WO1999000649A1 (en)

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Also Published As

Publication number Publication date
CA2292401C (en) 2006-08-01
AU8170698A (en) 1999-01-19
JP2002508063A (en) 2002-03-12
US6384401B1 (en) 2002-05-07
US5959291A (en) 1999-09-28
US6011252A (en) 2000-01-04
DE69837757D1 (en) 2007-06-21
EP0991923B1 (en) 2007-05-09
US6172353B1 (en) 2001-01-09
EP0991923B9 (en) 2007-10-17
ATE362095T1 (en) 2007-06-15
EP0991923A4 (en) 2001-03-28
WO1999000649A1 (en) 1999-01-07
EP0991923A1 (en) 2000-04-12
DE69837757T2 (en) 2008-01-17
AU734271B2 (en) 2001-06-07

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