JPS56141510A - Photodetector - Google Patents

Photodetector

Info

Publication number
JPS56141510A
JPS56141510A JP4409180A JP4409180A JPS56141510A JP S56141510 A JPS56141510 A JP S56141510A JP 4409180 A JP4409180 A JP 4409180A JP 4409180 A JP4409180 A JP 4409180A JP S56141510 A JPS56141510 A JP S56141510A
Authority
JP
Japan
Prior art keywords
phase
loop
output
signal
outputs
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
JP4409180A
Other languages
Japanese (ja)
Inventor
Atsuhiko Kato
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.)
Komatsu Ltd
Original Assignee
Komatsu 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 Komatsu Ltd filed Critical Komatsu Ltd
Priority to JP4409180A priority Critical patent/JPS56141510A/en
Publication of JPS56141510A publication Critical patent/JPS56141510A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S3/00—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received
    • G01S3/78—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received using electromagnetic waves other than radio waves
    • G01S3/782—Systems for determining direction or deviation from predetermined direction

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Length Measuring Devices By Optical Means (AREA)

Abstract

PURPOSE:To eliminate pulselike noise and improve accuracy of detection by detecting a rotating laser beam with plural photodetectors, removing error signals through a phase synchronizing loop and digitally processing the plural signals. CONSTITUTION:When a rotating laser beam L enters a solar battery SC, negative pulses are produced at the point (a) through a transistor 22, and the output from the output terminal 24 of an inverter 23 is applied to the input terminal 31 of a phase synchronizing loop 30. The pulse signal thereof is compared with the phase of the oscillation signal from a voltage control oscillator 35 in a phase comparator 33 via an amplifier 32. The deviation signal thereof is applied via a loop filter 34 to the voltage control oscillator 35 whereby the phase difference is reduced. The output of the loop 34 outputs a digital signal through a source follower 36, and a comparator 37. The outputs of four pieces of such solar batteries are processed, whereby the incidence position of the beam is detected strongly against noise and with good accuracy.
JP4409180A 1980-04-04 1980-04-04 Photodetector Pending JPS56141510A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4409180A JPS56141510A (en) 1980-04-04 1980-04-04 Photodetector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4409180A JPS56141510A (en) 1980-04-04 1980-04-04 Photodetector

Publications (1)

Publication Number Publication Date
JPS56141510A true JPS56141510A (en) 1981-11-05

Family

ID=12681943

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4409180A Pending JPS56141510A (en) 1980-04-04 1980-04-04 Photodetector

Country Status (1)

Country Link
JP (1) JPS56141510A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59109910U (en) * 1983-01-17 1984-07-24 飯塚　正 Leveling rod for laser rotary level
JPS6011009U (en) * 1983-07-04 1985-01-25 旭精密株式会社 Two-dimensional level luminous flux reception and detection device
JPS6011011U (en) * 1983-07-04 1985-01-25 旭精密株式会社 Two-dimensional level luminous flux receiving and detecting device
JPS6361912A (en) * 1986-09-02 1988-03-18 Sotsukishiya:Kk Level setting method using rotary irradiation type leveling machine
JPH02128515U (en) * 1989-03-29 1990-10-23

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59109910U (en) * 1983-01-17 1984-07-24 飯塚　正 Leveling rod for laser rotary level
JPS6011009U (en) * 1983-07-04 1985-01-25 旭精密株式会社 Two-dimensional level luminous flux reception and detection device
JPS6011011U (en) * 1983-07-04 1985-01-25 旭精密株式会社 Two-dimensional level luminous flux receiving and detecting device
JPH044176Y2 (en) * 1983-07-04 1992-02-07
JPS6361912A (en) * 1986-09-02 1988-03-18 Sotsukishiya:Kk Level setting method using rotary irradiation type leveling machine
JPH02128515U (en) * 1989-03-29 1990-10-23

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