WO2002054109A1 - Procede de detection d'une temporisation d'emissions laser - Google Patents

Procede de detection d'une temporisation d'emissions laser Download PDF

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Publication number
WO2002054109A1
WO2002054109A1 PCT/JP2001/011243 JP0111243W WO02054109A1 WO 2002054109 A1 WO2002054109 A1 WO 2002054109A1 JP 0111243 W JP0111243 W JP 0111243W WO 02054109 A1 WO02054109 A1 WO 02054109A1
Authority
WO
WIPO (PCT)
Prior art keywords
light
voltage
timing
emitting element
optical signal
Prior art date
Application number
PCT/JP2001/011243
Other languages
English (en)
Japanese (ja)
Inventor
Naoto Inaba
Masaya Nagasawa
Original Assignee
Nikon Corporation
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 Nikon Corporation filed Critical Nikon Corporation
Publication of WO2002054109A1 publication Critical patent/WO2002054109A1/fr

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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

Definitions

  • Light emission timing detection method Description Light emission timing detection method, light emission timing detection device, and distance measuring device
  • the time difference between the light emission timing and the light reception timing of the pulsed laser light is counted by the number of sample clock pulses generated therebetween. Therefore, in the laser ranging method, a high-frequency oscillator and a cPU having a high signal processing capability are used in order to improve the measurement accuracy of the distance to the target.
  • a drive current is supplied from a constant current source in the driver circuit to the semiconductor laser based on the above-described light emission start signal synchronized with the clock pulse. It was found that a certain evening lag ⁇ t (a time delay of the order of several nsec) occurs until the value of the drive current exceeds a certain value at which a predetermined light output can be obtained (Fig. 6).
  • the light emission timing detection method is to detect a voltage applied to the light emitting element, and use a timing at which the detected voltage reaches a predetermined voltage as a light emission timing of the light emitting element. .
  • a distance measuring apparatus is a distance measuring device, comprising: a light emitting element for generating a pulsed optical signal; an irradiating unit for irradiating the optical signal to a target; A light receiving element for detecting an optical signal reflected from the object; and a point in time when the voltage detected by the voltage section reaches a predetermined value, until a light signal reflected from the object is detected. And a distance calculation unit that calculates a distance to the object based on the time measured by the clock unit and the optical signal.
  • FIG. 1 is a perspective view of a laser distance measuring apparatus to which the present invention is applied.
  • FIG. 2 is a block diagram showing the internal configuration of the laser distance measuring device.
  • FIG. 5 is a timing chart showing how light reception timing is measured when obtaining the distance to the target.
  • FIG. 1 is a perspective view of a laser distance measuring apparatus 100 to which the present invention is applied
  • FIG. 2 is a block diagram showing an internal configuration thereof.
  • the laser distance measuring apparatus 100 is provided with a power and measurement start button 101 and a mode change 102 on its upper surface.
  • the mode button 101 is used to change the unit of the distance.
  • a laser irradiation window 103 and a laser receiving window 104 are provided on the front surface thereof, and a finder window (not shown) is provided on the rear surface thereof.
  • the laser distance measuring device 100 has a collimating lens 111 on the side of the laser irradiation window 103 and a condensing lens 121 on the side of the laser receiving window 104.
  • the semiconductor lens (light emitting element) 112 the pulse generation circuit 130, the light emission detection circuit 14 0 is arranged.
  • a photodiode (light receiving element) 122 and a receiving circuit 150 are arranged on the converging lens 122 side.
  • the irradiation part is constituted by the semiconductor laser 112 and the collimating lens 111.
  • the control circuit 160 controls the above-described pulse generation circuit 130 and the light emission detection circuit 140 so that a predetermined timing (light emission timing) is output from the semiconductor laser 112. ) To irradiate laser light.
  • control circuit 160 detects the timing of receiving the laser beam reflected by the target 1 based on the signal from the receiving circuit 150.
  • the control circuit 160 detects the time difference between the light emission timing and the light reception timing (t in FIG. 2 (b)) by counting clock pulses (see FIG. 5).
  • the control circuit 160 calculates the distance L from the laser range finder 100 to the object 1 based on the counted time difference t and the speed of the laser light.
  • the control circuit 160 displays this calculation result on the liquid crystal display section 170 in the finder.
  • the control circuit 160 functions as a clock unit, a light emission timing detection unit, and a distance calculation unit.
  • the light emission detection circuit 140 outputs a signal indicating the irradiation timing (light emission timing) of the laser light.
  • One terminal of the comparator 140 of the light emission detection circuit 140 is connected to one of the terminals of the constant current source 116 of the semiconductor laser 112, and the other terminal is connected to the constant voltage source 144 of the other terminal. ing.
  • a current source 116 supplying a current thereto is connected to the semiconductor laser 112 via a switch 113.
  • the switch 113 is turned on by the light emission start signal S1 from the pulse generation circuit 130.
  • the light emission start signal S1 is generated in synchronization with a clock pulse as shown in FIG.
  • the timing at which the output signal of the comparator 142 rises is a timing delayed by the drive current delay time ⁇ t with respect to the light emission start signal S1 (FIG. 5).
  • the voltage V applied to the semiconductor laser 112 is a constant value V. (V TH ⁇ V. ⁇ V F ) Outputs a signal that turns on when it becomes equal to or greater than to the control circuit 160.
  • the time difference t When counting the time difference t from the rising of the output signal S2 of the light emission detection circuit to the rising timing (light receiving timing) of the light receiving pulse S3, the time difference t may be directly counted.
  • the time difference t from the rising edge of the light emission start signal S1 to the rising timing of the light reception pulse S3 (light reception time), is determined. From the rising timing of the light emission start signal S1, the light emission detection circuit 140 The time difference At until the rising timing of the output signal S2 may be obtained, and ⁇ t may be subtracted from t.
  • the timing at which a constant light output (P 01) is obtained from the semiconductor laser 112 is detected by the operation of the light emission detection circuit 140. Therefore, the delay time A t between the light emission start signal S 1 from the pulse generation circuit 130 and the light emission timing (equivalent to the rising timing of the output signal) is not included in the measurement of the time difference t. Measurement accuracy is improved.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Optical Radar Systems And Details Thereof (AREA)
  • Measurement Of Optical Distance (AREA)
  • Length Measuring Devices By Optical Means (AREA)

Abstract

L'invention porte sur un télémètre laser (100) comportant un laser à semi-conducteur (112) présentant une temporisation d'émissions telle que la tension V lui étant appliquée atteigne un niveau spécifique (VTH VF) pour lequel un ledit laser (112) produit un signal optique de sortie constant PO1. On peut donc détecter avec précision la temporisation correspondant à une émission constante de l'élément émetteur de lumière.
PCT/JP2001/011243 2000-12-27 2001-12-21 Procede de detection d'une temporisation d'emissions laser WO2002054109A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2000-399169 2000-12-27
JP2000399169A JP2004053250A (ja) 2000-12-27 2000-12-27 発光タイミング検出方法、発光タイミング検出装置、及び測距装置

Publications (1)

Publication Number Publication Date
WO2002054109A1 true WO2002054109A1 (fr) 2002-07-11

Family

ID=18864000

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2001/011243 WO2002054109A1 (fr) 2000-12-27 2001-12-21 Procede de detection d'une temporisation d'emissions laser

Country Status (2)

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JP (1) JP2004053250A (fr)
WO (1) WO2002054109A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006196129A (ja) * 2005-01-17 2006-07-27 Matsushita Electric Ind Co Ltd ディスク識別装置、ディスク挿排装置及びディスク装置
JP5552215B2 (ja) * 2008-03-27 2014-07-16 パナソニック株式会社 発光装置およびそれを用いる空間情報検出装置
JP5507053B2 (ja) * 2008-03-27 2014-05-28 パナソニック株式会社 距離測定装置
EP2189806B1 (fr) * 2008-11-20 2011-05-18 Sick Ag Capteur optoélectronique
JP6942452B2 (ja) * 2016-09-09 2021-09-29 日本信号株式会社 測距装置
WO2021039933A1 (fr) * 2019-08-28 2021-03-04 ソニーセミコンダクタソリューションズ株式会社 Système de télémétrie et pilote d'élément électroluminescent
US20220268900A1 (en) * 2019-09-23 2022-08-25 Sony Semiconductor Solutions Corporation Ranging system

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3937575A (en) * 1973-11-26 1976-02-10 Martin Marietta Corporation Electro-optical ranging means
US5227784A (en) * 1990-12-10 1993-07-13 Mazda Motor Corporation System for detecting and determining range of target vehicle
JPH06102343A (ja) * 1992-09-17 1994-04-15 Hitachi Ltd 物体の状態検知方法とその装置及びそれを用いた測距方法及び装置
JPH08184672A (ja) * 1994-12-28 1996-07-16 Fujitsu Ten Ltd 距離計測装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3937575A (en) * 1973-11-26 1976-02-10 Martin Marietta Corporation Electro-optical ranging means
US5227784A (en) * 1990-12-10 1993-07-13 Mazda Motor Corporation System for detecting and determining range of target vehicle
JPH06102343A (ja) * 1992-09-17 1994-04-15 Hitachi Ltd 物体の状態検知方法とその装置及びそれを用いた測距方法及び装置
JPH08184672A (ja) * 1994-12-28 1996-07-16 Fujitsu Ten Ltd 距離計測装置

Also Published As

Publication number Publication date
JP2004053250A (ja) 2004-02-19

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