JPS57106864A - Optical car speed detector - Google Patents

Optical car speed detector

Info

Publication number
JPS57106864A
JPS57106864A JP18323080A JP18323080A JPS57106864A JP S57106864 A JPS57106864 A JP S57106864A JP 18323080 A JP18323080 A JP 18323080A JP 18323080 A JP18323080 A JP 18323080A JP S57106864 A JPS57106864 A JP S57106864A
Authority
JP
Japan
Prior art keywords
speed
optical
detecting
car
detecting points
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
JP18323080A
Other languages
Japanese (ja)
Inventor
Yutaka 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.)
Omron Corp
Original Assignee
Tateisi Electronics Co
Omron Tateisi Electronics Co
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 Tateisi Electronics Co, Omron Tateisi Electronics Co filed Critical Tateisi Electronics Co
Priority to JP18323080A priority Critical patent/JPS57106864A/en
Publication of JPS57106864A publication Critical patent/JPS57106864A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
    • G01P3/64—Devices characterised by the determination of the time taken to traverse a fixed distance
    • G01P3/68—Devices characterised by the determination of the time taken to traverse a fixed distance using optical means, i.e. using infrared, visible, or ultraviolet light

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Optical Distance (AREA)

Abstract

PURPOSE:To detect travelling speed without the influence of distane, car height, from optical systems in an optical car speed detector by setting up appropriately the optical pathes of reflected rays from 3 detecting points. CONSTITUTION:A camera 30 incorporates 2 optical systems which are provided with lenses 31 and 32 respectively. The camera 30 is directed to a detecting surface P. The lens 31 includes the 1st and 3rd detecting points P1, P3 which are separated by L2 to each other within its field. The lens 32 detects the 2nd detecting point P2 which is positioned between these detecting points P1 and P2. Respective detecting points P1-P3 are correspondingly provided with photodetectors J1-J3, which detect reflected light when a car with speed V passes through P. If the required time for the distance between P1 and P2 and P2 and P3 are t1 and t2 respectively, speed V=d2/(T2-T1)[where, T1=t1(d1+d2)/ (a1+a2) and T2=t2d1/a2]. Since the values other than t1 and t2 are constant, car height is changed and travelling speed can be measured precisely even if (g) is changed.
JP18323080A 1980-12-23 1980-12-23 Optical car speed detector Pending JPS57106864A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP18323080A JPS57106864A (en) 1980-12-23 1980-12-23 Optical car speed detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18323080A JPS57106864A (en) 1980-12-23 1980-12-23 Optical car speed detector

Publications (1)

Publication Number Publication Date
JPS57106864A true JPS57106864A (en) 1982-07-02

Family

ID=16132054

Family Applications (1)

Application Number Title Priority Date Filing Date
JP18323080A Pending JPS57106864A (en) 1980-12-23 1980-12-23 Optical car speed detector

Country Status (1)

Country Link
JP (1) JPS57106864A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103926588A (en) * 2014-04-28 2014-07-16 无锡成电光纤传感科技有限公司 Rail vehicle positioning and speed detecting system based on phi-OTDR

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103926588A (en) * 2014-04-28 2014-07-16 无锡成电光纤传感科技有限公司 Rail vehicle positioning and speed detecting system based on phi-OTDR

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