DE3786522T2 - Spectrophotometer mit Netzfrequenzgesteuertem Spannungsfrequenzumsetzersystem. - Google Patents

Spectrophotometer mit Netzfrequenzgesteuertem Spannungsfrequenzumsetzersystem.

Info

Publication number
DE3786522T2
DE3786522T2 DE19873786522 DE3786522T DE3786522T2 DE 3786522 T2 DE3786522 T2 DE 3786522T2 DE 19873786522 DE19873786522 DE 19873786522 DE 3786522 T DE3786522 T DE 3786522T DE 3786522 T2 DE3786522 T2 DE 3786522T2
Authority
DE
Germany
Prior art keywords
spectrophotometer
converter system
controlled voltage
frequency converter
mains
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.)
Expired - Fee Related
Application number
DE19873786522
Other languages
English (en)
Other versions
DE3786522D1 (de
Inventor
Charles M Wittmer
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.)
Applera Corp
Original Assignee
Perkin Elmer Corp
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 Perkin Elmer Corp filed Critical Perkin Elmer Corp
Application granted granted Critical
Publication of DE3786522D1 publication Critical patent/DE3786522D1/de
Publication of DE3786522T2 publication Critical patent/DE3786522T2/de
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

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
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M1/00—Analogue/digital conversion; Digital/analogue conversion
    • H03M1/06—Continuously compensating for, or preventing, undesired influence of physical parameters
    • H03M1/0617—Continuously compensating for, or preventing, undesired influence of physical parameters characterised by the use of methods or means not specific to a particular type of detrimental influence
    • H03M1/0624—Continuously compensating for, or preventing, undesired influence of physical parameters characterised by the use of methods or means not specific to a particular type of detrimental influence by synchronisation
    • 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
    • G01J2001/4413—Type
    • G01J2001/4426—Type with intensity to frequency or voltage to frequency conversion [IFC or VFC]
    • 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
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/28—Investigating the spectrum
    • G01J3/42—Absorption spectrometry; Double beam spectrometry; Flicker spectrometry; Reflection spectrometry
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M1/00—Analogue/digital conversion; Digital/analogue conversion
    • H03M1/12—Analogue/digital converters
    • H03M1/18—Automatic control for modifying the range of signals the converter can handle, e.g. gain ranging
    • H03M1/181—Automatic control for modifying the range of signals the converter can handle, e.g. gain ranging in feedback mode, i.e. by determining the range to be selected from one or more previous digital output values
    • H03M1/183—Automatic control for modifying the range of signals the converter can handle, e.g. gain ranging in feedback mode, i.e. by determining the range to be selected from one or more previous digital output values the feedback signal controlling the gain of an amplifier or attenuator preceding the analogue/digital converter
    • H03M1/185—Automatic control for modifying the range of signals the converter can handle, e.g. gain ranging in feedback mode, i.e. by determining the range to be selected from one or more previous digital output values the feedback signal controlling the gain of an amplifier or attenuator preceding the analogue/digital converter the determination of the range being based on more than one digital output value, e.g. on a running average, a power estimation or the rate of change
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M1/00—Analogue/digital conversion; Digital/analogue conversion
    • H03M1/12—Analogue/digital converters
    • H03M1/60—Analogue/digital converters with intermediate conversion to frequency of pulses
DE19873786522 1986-11-07 1987-10-29 Spectrophotometer mit Netzfrequenzgesteuertem Spannungsfrequenzumsetzersystem. Expired - Fee Related DE3786522T2 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US92799186A 1986-11-07 1986-11-07

Publications (2)

Publication Number Publication Date
DE3786522D1 DE3786522D1 (de) 1993-08-19
DE3786522T2 true DE3786522T2 (de) 1993-11-18

Family

ID=25455553

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19873786522 Expired - Fee Related DE3786522T2 (de) 1986-11-07 1987-10-29 Spectrophotometer mit Netzfrequenzgesteuertem Spannungsfrequenzumsetzersystem.

Country Status (3)

Country Link
EP (1) EP0266682B1 (de)
JP (1) JP2730577B2 (de)
DE (1) DE3786522T2 (de)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0295221A (ja) * 1988-09-30 1990-04-06 Shimadzu Corp 分光光度計
DE69111800T2 (de) * 1991-06-20 1995-12-14 Hewlett Packard Gmbh Photodiodenanordnung.
US5345236A (en) * 1992-12-21 1994-09-06 Harris Corporation Improved sigma-delta type analog-to-digital converter and method
US5349352A (en) * 1992-12-21 1994-09-20 Harris Corporation Analog-to-digital converter having high AC line noise rejection and insensitive to AC line frequency variations
US6307629B1 (en) 1997-08-12 2001-10-23 Lj Laboratories, L.L.C. Apparatus and method for measuring optical characteristics of an object
US6254385B1 (en) 1997-01-02 2001-07-03 Lj Laboratories, Llc Apparatus and method for measuring optical characteristics of teeth
US6373573B1 (en) 2000-03-13 2002-04-16 Lj Laboratories L.L.C. Apparatus for measuring optical characteristics of a substrate and pigments applied thereto
US6301004B1 (en) 2000-05-31 2001-10-09 Lj Laboratories, L.L.C. Apparatus and method for measuring optical characteristics of an object
US6501542B2 (en) 1998-06-30 2002-12-31 Lj Laboratories, Llc Apparatus and method for measuring optical characteristics of an object
US6573984B2 (en) 1998-06-30 2003-06-03 Lj Laboratories Llc Apparatus and method for measuring optical characteristics of teeth
US6903813B2 (en) 2002-02-21 2005-06-07 Jjl Technologies Llc Miniaturized system and method for measuring optical characteristics
GB2532015B (en) * 2014-11-04 2018-12-26 Cirrus Logic Int Semiconductor Ltd Improved analogue-to-digital convertor

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3530458A (en) * 1965-10-28 1970-09-22 Westinghouse Electric Corp Analog to digital conversion system having improved accuracy
US3500196A (en) * 1967-03-20 1970-03-10 Systron Donner Corp Digital voltage measuring instrument having a variable time base determined by a reference signal
GB1580530A (en) * 1975-12-30 1980-12-03 Contrology Tech Ltd Analogue to digital meter circuit
US4201472A (en) * 1977-04-04 1980-05-06 Hitachi, Ltd. Apparatus for converting light signals into digital electrical signals
JPS5558422A (en) * 1978-10-26 1980-05-01 Shimadzu Corp Wavelength drive type spectrophotometer
US4380757A (en) * 1980-01-28 1983-04-19 Westinghouse Electric Corp. Data acquisition system and analog to digital converter therefor
JPS5945714A (ja) * 1982-09-08 1984-03-14 Toshiba Corp 同期化回路方式
JPS60104758U (ja) * 1983-12-20 1985-07-17 三洋電機株式会社 ガス濃度測定装置

Also Published As

Publication number Publication date
JP2730577B2 (ja) 1998-03-25
EP0266682A2 (de) 1988-05-11
EP0266682B1 (de) 1993-07-14
JPS63134925A (ja) 1988-06-07
DE3786522D1 (de) 1993-08-19
EP0266682A3 (en) 1990-08-08

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Legal Events

Date Code Title Description
8364 No opposition during term of opposition
8339 Ceased/non-payment of the annual fee