JPS6413424A - Photometric circuit - Google Patents

Photometric circuit

Info

Publication number
JPS6413424A
JPS6413424A JP17039187A JP17039187A JPS6413424A JP S6413424 A JPS6413424 A JP S6413424A JP 17039187 A JP17039187 A JP 17039187A JP 17039187 A JP17039187 A JP 17039187A JP S6413424 A JPS6413424 A JP S6413424A
Authority
JP
Japan
Prior art keywords
circuit
component
signal
amplified
sensor
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.)
Pending
Application number
JP17039187A
Other languages
Japanese (ja)
Inventor
Jiro Arima
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.)
Minolta Co Ltd
Original Assignee
Minolta Co Ltd
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 Minolta Co Ltd filed Critical Minolta Co Ltd
Priority to JP17039187A priority Critical patent/JPS6413424A/en
Publication of JPS6413424A publication Critical patent/JPS6413424A/en
Pending 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

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)

Abstract

PURPOSE:To obtain a photometric circuit simple in constitution with good light measurement accuracy by photodetecting stationary light and chopped light by using only one sensor. CONSTITUTION:A resistance 13 which converts a photocurrent into a voltage is connected in series with the sensor 3 and a capacitor 15 which leads only an AC component out is connected to the connection point to pass a high frequency signal and cut a low frequency signal. The output of the AC component is amplified by an amplifier 16, whose output is supplied to a circuit 8 which generates a timing signal for sample holding from the signal of the AC component and an absolute value circuit 9. Further, the photoelectric current of the sensor 3 is amplified by an amplifier 14, whose output is sent to a sample holding circuit 7 for extracting the signal of the DC component. Consequently, the signals of the DC and AC components are amplified only by the amplifiers 14 and 16 to improve the S/N. The variations of the signals of the DC and AC components are about 10<3> times and >=100 times, but this circuit uses the amplifiers 14 and 16 individually, so proper magnification can be applied.
JP17039187A 1987-07-07 1987-07-07 Photometric circuit Pending JPS6413424A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP17039187A JPS6413424A (en) 1987-07-07 1987-07-07 Photometric circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17039187A JPS6413424A (en) 1987-07-07 1987-07-07 Photometric circuit

Publications (1)

Publication Number Publication Date
JPS6413424A true JPS6413424A (en) 1989-01-18

Family

ID=15904059

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17039187A Pending JPS6413424A (en) 1987-07-07 1987-07-07 Photometric circuit

Country Status (1)

Country Link
JP (1) JPS6413424A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02263123A (en) * 1989-04-04 1990-10-25 Sony Corp Light receiving circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02263123A (en) * 1989-04-04 1990-10-25 Sony Corp Light receiving circuit

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