JPS5679922A - Optical filter system - Google Patents

Optical filter system

Info

Publication number
JPS5679922A
JPS5679922A JP15771379A JP15771379A JPS5679922A JP S5679922 A JPS5679922 A JP S5679922A JP 15771379 A JP15771379 A JP 15771379A JP 15771379 A JP15771379 A JP 15771379A JP S5679922 A JPS5679922 A JP S5679922A
Authority
JP
Japan
Prior art keywords
spectral sensitivity
output
sensitivity characteristics
electric filter
photodiode
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
JP15771379A
Other languages
Japanese (ja)
Inventor
Yoshitaka Fujikawa
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.)
Ricoh Co Ltd
Original Assignee
Ricoh 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 Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP15771379A priority Critical patent/JPS5679922A/en
Publication of JPS5679922A publication Critical patent/JPS5679922A/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

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Spectrometry And Color Measurement (AREA)

Abstract

PURPOSE:To miniaturize a device by converting spectral sensitivity characteristics of a photodiode into random spectral sensitivity characteristics by using characteristics of a modulating circuit and electric filter. CONSTITUTION:Spectral sensitivity characteristics (1), of output (u) of amplifier 1 that amplifies the output of photodiode PD0 are amplitude-modulated by modulating circuit 2 at output frequency (f) of voltage-frequency converting circuit 7 to obtain u'. Therefore, when electric filter 3 has frequency (f)/relative-output characteristics (2), output u0 of electric filter 3 has spectral sensitivity characteristics (3) through conversion. Namely, spectral sensitivity characteristics (1) of photodiode PD0 can be converted into required spectral sensitivity characteristics (3) by characteristics of modulating circuit 2 and electric filter 3, and consequently there is no need to replace the optical filter, so that the device can be miniaturized and reduced in cost.
JP15771379A 1979-12-05 1979-12-05 Optical filter system Pending JPS5679922A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15771379A JPS5679922A (en) 1979-12-05 1979-12-05 Optical filter system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15771379A JPS5679922A (en) 1979-12-05 1979-12-05 Optical filter system

Publications (1)

Publication Number Publication Date
JPS5679922A true JPS5679922A (en) 1981-06-30

Family

ID=15655740

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15771379A Pending JPS5679922A (en) 1979-12-05 1979-12-05 Optical filter system

Country Status (1)

Country Link
JP (1) JPS5679922A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5175697A (en) * 1986-06-02 1992-12-29 Minolta Camera Kabushiki Kaisha Spectrophotometer for accurately measuring light intensity in a specific wavelength region

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5175697A (en) * 1986-06-02 1992-12-29 Minolta Camera Kabushiki Kaisha Spectrophotometer for accurately measuring light intensity in a specific wavelength region
US5305233A (en) * 1986-06-02 1994-04-19 Minolta Camera Kabushiki Kaisha Spectrophotometer for accurately measuring light intensity in a specific wavelength region

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