JPS5773635A - Photoelectric detector - Google Patents

Photoelectric detector

Info

Publication number
JPS5773635A
JPS5773635A JP14959280A JP14959280A JPS5773635A JP S5773635 A JPS5773635 A JP S5773635A JP 14959280 A JP14959280 A JP 14959280A JP 14959280 A JP14959280 A JP 14959280A JP S5773635 A JPS5773635 A JP S5773635A
Authority
JP
Japan
Prior art keywords
output
light
pass filter
emitting element
light emitting
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
JP14959280A
Other languages
Japanese (ja)
Inventor
Norio Kusano
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.)
EMU II KAIHATSU GIKEN KK
M II KAIHATSU GIKEN KK
Original Assignee
EMU II KAIHATSU GIKEN KK
M II KAIHATSU GIKEN KK
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 EMU II KAIHATSU GIKEN KK, M II KAIHATSU GIKEN KK filed Critical EMU II KAIHATSU GIKEN KK
Priority to JP14959280A priority Critical patent/JPS5773635A/en
Publication of JPS5773635A publication Critical patent/JPS5773635A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V8/00—Prospecting or detecting by optical means
    • G01V8/10—Detecting, e.g. by using light barriers
    • G01V8/12—Detecting, e.g. by using light barriers using one transmitter and one receiver

Landscapes

  • Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Geophysics (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)

Abstract

PURPOSE:To prevent an error due to disturbing light by passing a photodetection output, obtained by turning on and off a light emitting element for pulses, through a high-pass filter which turns on synchronizing with the said pulses. CONSTITUTION:The pulse output of an oscillator 1 is supplied to a light emitting element 2 and a transfer circuit (synchronous high-pass filter) 6. When a light shielding body 3 is off an optical path L, the emitted light of the light emitting element 2 enters a photodetecting element 4 and then enters the synchronous high-pass filter 6 through a preamplifier 5. The output of the filter 6 is inputted to the detecting circuit 19 consisting of a detecting and smoothing circuit (integral network) 7 and a level discriminating circuit 8 to discriminate whether the mean output value of the filter 6 has a prescribed value or not, thereby outputting the result to an output terminal 10. Consequently, the output waveform (c) of the amplifier 5 including disturbing light, after passing through the synchronous high-pass filter 6, synchronizes with a synchronizing signal (d) and changes into a waveform (e) having no low frequency component L, thus excluding an error due to disturbing light.
JP14959280A 1980-10-25 1980-10-25 Photoelectric detector Pending JPS5773635A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14959280A JPS5773635A (en) 1980-10-25 1980-10-25 Photoelectric detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14959280A JPS5773635A (en) 1980-10-25 1980-10-25 Photoelectric detector

Publications (1)

Publication Number Publication Date
JPS5773635A true JPS5773635A (en) 1982-05-08

Family

ID=15478565

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14959280A Pending JPS5773635A (en) 1980-10-25 1980-10-25 Photoelectric detector

Country Status (1)

Country Link
JP (1) JPS5773635A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6375524A (en) * 1986-09-18 1988-04-05 Hitachi Maxell Ltd Color discriminating device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6375524A (en) * 1986-09-18 1988-04-05 Hitachi Maxell Ltd Color discriminating device

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