JPS56130659A - Measuring device for speed of moving object - Google Patents

Measuring device for speed of moving object

Info

Publication number
JPS56130659A
JPS56130659A JP3456480A JP3456480A JPS56130659A JP S56130659 A JPS56130659 A JP S56130659A JP 3456480 A JP3456480 A JP 3456480A JP 3456480 A JP3456480 A JP 3456480A JP S56130659 A JPS56130659 A JP S56130659A
Authority
JP
Japan
Prior art keywords
signal
speed
moving object
speckle pattern
period
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
JP3456480A
Other languages
Japanese (ja)
Other versions
JPS6032136B2 (en
Inventor
Kazuo Yamaguchi
Satoshi Fushimi
Yasuo Nakagawa
Nobuhiko Aoki
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.)
Hitachi Cable Ltd
Original Assignee
Hitachi Cable 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 Hitachi Cable Ltd filed Critical Hitachi Cable Ltd
Priority to JP3456480A priority Critical patent/JPS6032136B2/en
Publication of JPS56130659A publication Critical patent/JPS56130659A/en
Publication of JPS6032136B2 publication Critical patent/JPS6032136B2/en
Expired 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
    • G01P3/36—Devices characterised by the use of optical means, e.g. using infrared, visible, or ultraviolet light
    • G01P3/366—Devices characterised by the use of optical means, e.g. using infrared, visible, or ultraviolet light by using diffraction of light

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Electromagnetism (AREA)
  • Power Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Length Measuring Devices By Optical Means (AREA)

Abstract

PURPOSE:To measure the speed with a high precision, by subjecting the translation signal of the speckle pattern of the moving object, which is irradiated with the interferable light, to Fourier conversion and by measuring the frequency of the waveform obtained by sampling values in a specific space frequency. CONSTITUTION:In respect to measurement for the speed of moving object 6 which is irradiated with the interferable light, the translation motion of speckle pattern 7 focused onto CCD image sensor 5 is converted photoelectrically to obtain odd element signal (a) and even element signal (b). Signal (a) is sample-held in 8 and has the phase matched to that of signal (b) to obtain signal (c), and the difference between signals (c) and (b) is operated by subtractor 11 to obtain signal (d), and this signal (d) is amplified by 12 and is multiplied by cosine wave (e) from signal generator 13 to obtain signal (f), and this signal (f) is integrated during one scanning period T of the CCD by integrator 15 to obtain signal (g), and the integral value in its specific space frequency mu0 is extracted by sample hold circuit 8 and A/D converter 17 and is stored in 18. Since the period of output (h) obtained by plotting Fourier conversion values which are obtained by repeating this sampling is equal to the time when the speckle pattern is moved by one pitch of the space filter, this period is measured and averaged by calculator 21 to measure the speed with a high precision, and the speed is displayed on 22.
JP3456480A 1980-03-18 1980-03-18 Speed measurement device for moving objects Expired JPS6032136B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3456480A JPS6032136B2 (en) 1980-03-18 1980-03-18 Speed measurement device for moving objects

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3456480A JPS6032136B2 (en) 1980-03-18 1980-03-18 Speed measurement device for moving objects

Publications (2)

Publication Number Publication Date
JPS56130659A true JPS56130659A (en) 1981-10-13
JPS6032136B2 JPS6032136B2 (en) 1985-07-26

Family

ID=12417801

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3456480A Expired JPS6032136B2 (en) 1980-03-18 1980-03-18 Speed measurement device for moving objects

Country Status (1)

Country Link
JP (1) JPS6032136B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61159104A (en) * 1984-12-29 1986-07-18 Omron Tateisi Electronics Co Detecting device for center of rotation
EP0328781A2 (en) * 1988-01-22 1989-08-23 Rockwell International Corporation A velocimeter for a printing press web

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61159104A (en) * 1984-12-29 1986-07-18 Omron Tateisi Electronics Co Detecting device for center of rotation
EP0328781A2 (en) * 1988-01-22 1989-08-23 Rockwell International Corporation A velocimeter for a printing press web

Also Published As

Publication number Publication date
JPS6032136B2 (en) 1985-07-26

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