JPS57184985A - Photo-detecting circuit for laser distance measuring device - Google Patents

Photo-detecting circuit for laser distance measuring device

Info

Publication number
JPS57184985A
JPS57184985A JP55140237A JP14023780A JPS57184985A JP S57184985 A JPS57184985 A JP S57184985A JP 55140237 A JP55140237 A JP 55140237A JP 14023780 A JP14023780 A JP 14023780A JP S57184985 A JPS57184985 A JP S57184985A
Authority
JP
Japan
Prior art keywords
pulse
target
laser light
distance
time
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
JP55140237A
Other languages
Japanese (ja)
Other versions
JPS6223828B2 (en
Inventor
Teruo Yakuo
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP55140237A priority Critical patent/JPS57184985A/en
Publication of JPS57184985A publication Critical patent/JPS57184985A/en
Publication of JPS6223828B2 publication Critical patent/JPS6223828B2/ja
Granted 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
    • G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
    • G01S17/02—Systems using the reflection of electromagnetic waves other than radio waves
    • G01S17/06—Systems determining position data of a target
    • G01S17/08—Systems determining position data of a target for measuring distance only
    • G01S17/10—Systems determining position data of a target for measuring distance only using transmission of interrupted, pulse-modulated waves

Abstract

PURPOSE:To eliminate a false reflection pulse and to enable measuring of even a short distance, by a method wherein a threshold, amplitude-discriminating a reflection pulse, is converted as a voltage whose magnitude varies depending on a time resulting from the start which is conducted by means of an oscillating pulse of laser light, and the voltage is caused to differ each time laser light is emitted. CONSTITUTION:Laser light of a Q switch oscillator 1 is focused by an optical system 2 and emitted toward a target, and a part thereof starts a monostable multivibrator 5 and a pulse counting part 17 through a detector 3, amplifier 4. Reflecting light from the target is recieved by an optical system 6, it is detected by a photomultiplier 7, and after amplified 8, it is added to a monostable multivibrator 14. The multivibrator 14 is triggered by a stop pulse exceeding a threshold trigger level, it is polarity inversed by an inverter 16, and is added to the counting part 17 to display a distance to the target. This changes values of a capacitor 15 and a bias resistance 13 each time a transmitting pulse is transmitted, which results in erasing a false reflecting pulse and in enabling to perform a measurement of a distance of and a detection of even a target located at a short distance.
JP55140237A 1980-10-07 1980-10-07 Photo-detecting circuit for laser distance measuring device Granted JPS57184985A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55140237A JPS57184985A (en) 1980-10-07 1980-10-07 Photo-detecting circuit for laser distance measuring device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55140237A JPS57184985A (en) 1980-10-07 1980-10-07 Photo-detecting circuit for laser distance measuring device

Publications (2)

Publication Number Publication Date
JPS57184985A true JPS57184985A (en) 1982-11-13
JPS6223828B2 JPS6223828B2 (en) 1987-05-25

Family

ID=15264091

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55140237A Granted JPS57184985A (en) 1980-10-07 1980-10-07 Photo-detecting circuit for laser distance measuring device

Country Status (1)

Country Link
JP (1) JPS57184985A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01197684A (en) * 1988-02-02 1989-08-09 Fujitsu Ten Ltd Distance measuring equipment
JPH0449890U (en) * 1990-09-03 1992-04-27
US6452665B1 (en) * 1999-08-10 2002-09-17 Honda Giken Kogyo Kabushiki Kaisha Object detecting system

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5347866A (en) * 1976-10-12 1978-04-28 Nec Corp Light receptor circuit for laser distance measurement equipment

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5347866A (en) * 1976-10-12 1978-04-28 Nec Corp Light receptor circuit for laser distance measurement equipment

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01197684A (en) * 1988-02-02 1989-08-09 Fujitsu Ten Ltd Distance measuring equipment
JPH0449890U (en) * 1990-09-03 1992-04-27
US6452665B1 (en) * 1999-08-10 2002-09-17 Honda Giken Kogyo Kabushiki Kaisha Object detecting system

Also Published As

Publication number Publication date
JPS6223828B2 (en) 1987-05-25

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