JPS5531939A - Measuring circuit for photo amount - Google Patents

Measuring circuit for photo amount

Info

Publication number
JPS5531939A
JPS5531939A JP10512278A JP10512278A JPS5531939A JP S5531939 A JPS5531939 A JP S5531939A JP 10512278 A JP10512278 A JP 10512278A JP 10512278 A JP10512278 A JP 10512278A JP S5531939 A JPS5531939 A JP S5531939A
Authority
JP
Japan
Prior art keywords
light flux
output
amplifier
integration
fed
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
JP10512278A
Other languages
Japanese (ja)
Other versions
JPS5921491B2 (en
Inventor
Azusa Ogawa
Kazuo Sano
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.)
Dainichiseika Color and Chemicals Mfg Co Ltd
Original Assignee
Dainichiseika Color and Chemicals Mfg 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 Dainichiseika Color and Chemicals Mfg Co Ltd filed Critical Dainichiseika Color and Chemicals Mfg Co Ltd
Priority to JP10512278A priority Critical patent/JPS5921491B2/en
Publication of JPS5531939A publication Critical patent/JPS5531939A/en
Publication of JPS5921491B2 publication Critical patent/JPS5921491B2/en
Expired 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
    • G01J1/46—Electric circuits using a capacitor

Landscapes

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

Abstract

PURPOSE:To measure the relation between the first and second light flux without any operational processing, by using the integration circuit having the memory circuit storing until the time when the integration of light flux reaches a given value. CONSTITUTION:The differential amplifier A1 forms the integration circuit consisting of the capacitor C1 and integration control switch S1, and the photo diode Pd is connected between the differential input terminals. The output of A1 is fed to the amplifier A2 of unity amplification factor via the switch S4 and it is displayed on DIPS. Further, the output of A1 is fed to the amplifier A3 forming a comparator, the output of A3 is fed to the control circuit CONT which controls the memory amplifier A4. When light flux alpha is incident to Pd, CONT is driven, and when V1 reaches the reference voltage V3, the output of A3 stores the capacitor C3 the time when the voltage is from V1 to V3. Next, V1 is retutned on zero and CONT is driven after selecting the light flux from alpha to beta, and the light flux beta is displayed on DIPS by integrating it by the said memory time.
JP10512278A 1978-08-29 1978-08-29 Light amount measurement circuit Expired JPS5921491B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10512278A JPS5921491B2 (en) 1978-08-29 1978-08-29 Light amount measurement circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10512278A JPS5921491B2 (en) 1978-08-29 1978-08-29 Light amount measurement circuit

Publications (2)

Publication Number Publication Date
JPS5531939A true JPS5531939A (en) 1980-03-06
JPS5921491B2 JPS5921491B2 (en) 1984-05-21

Family

ID=14398987

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10512278A Expired JPS5921491B2 (en) 1978-08-29 1978-08-29 Light amount measurement circuit

Country Status (1)

Country Link
JP (1) JPS5921491B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5885139A (en) * 1981-11-17 1983-05-21 Toshiba Corp Spectroscopic analysis apparatus
US4580321A (en) * 1984-06-13 1986-04-08 Yoshida Kogyo K. K. Fluid-tight slide fastener

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5885139A (en) * 1981-11-17 1983-05-21 Toshiba Corp Spectroscopic analysis apparatus
JPH0143900B2 (en) * 1981-11-17 1989-09-25 Tokyo Shibaura Electric Co
US4580321A (en) * 1984-06-13 1986-04-08 Yoshida Kogyo K. K. Fluid-tight slide fastener

Also Published As

Publication number Publication date
JPS5921491B2 (en) 1984-05-21

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