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JPS54130168A - Speed detector - Google Patents

Speed detector

Info

Publication number
JPS54130168A
JPS54130168A JP3751378A JP3751378A JPS54130168A JP S54130168 A JPS54130168 A JP S54130168A JP 3751378 A JP3751378 A JP 3751378A JP 3751378 A JP3751378 A JP 3751378A JP S54130168 A JPS54130168 A JP S54130168A
Authority
JP
Japan
Prior art keywords
signal
photoelectric transducer
noise
periodical
common mode
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
JP3751378A
Other languages
Japanese (ja)
Other versions
JPS5920103B2 (en
Inventor
Yoshio Kurita
Noritake Shibata
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.)
Yokogawa Electric Corp
Original Assignee
Yokogawa Hokushin Electric Corp
Yokogawa Electric Works 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 Yokogawa Hokushin Electric Corp, Yokogawa Electric Works Ltd filed Critical Yokogawa Hokushin Electric Corp
Priority to JP3751378A priority Critical patent/JPS5920103B2/en
Publication of JPS54130168A publication Critical patent/JPS54130168A/en
Publication of JPS5920103B2 publication Critical patent/JPS5920103B2/en
Expired legal-status Critical Current

Links

Landscapes

  • Length Measuring Devices By Optical Means (AREA)
  • Geophysics And Detection Of Objects (AREA)

Abstract

PURPOSE: To perform speed detection of high accuracy without subjecting to the influence of periodical noise by adjusting the phase of common mode noise contained in the noise signal obtainable from a moving object.
CONSTITUTION: Light having transmitted through moving paper 1 is detected with a photoelectric transducer 41 by way of a lens 31. Thereupon, the signal x(t) from the photoelectric transducer 41 is applied to a gain phase adjusting circuit 6. In addition, the difference of the signal from here and the signal from a photoelectric transducer 42 is obtained by an arithmetic circuit 7 and the output signal z(t) thereof is applied to a self-correlator 50, where the self correlation function ϕzz(τ) of z(t) is obtained. With this output signal ϕzz, a positive peak appears at ϕzz + ϕyy and a negative peak at ϕxy, ϕyz respectively, thus no periodical correlations owing to common mode noise appear. As a result, τ0 may be accurately detected and the velocity V may be known from the relation of τ0 = L/V.
COPYRIGHT: (C)1979,JPO&Japio
JP3751378A 1978-03-31 1978-03-31 speed detection device Expired JPS5920103B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3751378A JPS5920103B2 (en) 1978-03-31 1978-03-31 speed detection device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3751378A JPS5920103B2 (en) 1978-03-31 1978-03-31 speed detection device

Publications (2)

Publication Number Publication Date
JPS54130168A true JPS54130168A (en) 1979-10-09
JPS5920103B2 JPS5920103B2 (en) 1984-05-10

Family

ID=12499609

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3751378A Expired JPS5920103B2 (en) 1978-03-31 1978-03-31 speed detection device

Country Status (1)

Country Link
JP (1) JPS5920103B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4574238A (en) * 1983-05-20 1986-03-04 Leopold Weinlich Projectile speed measuring apparatus
WO2009008814A1 (en) * 2007-07-06 2009-01-15 Stfi, Skogsindustrins Tekniska Forsningsinstitut Ab Device and method for measuring the velocity of a moving paper web

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4574238A (en) * 1983-05-20 1986-03-04 Leopold Weinlich Projectile speed measuring apparatus
WO2009008814A1 (en) * 2007-07-06 2009-01-15 Stfi, Skogsindustrins Tekniska Forsningsinstitut Ab Device and method for measuring the velocity of a moving paper web
JP2010532829A (en) * 2007-07-06 2010-10-14 エステーエフイー・スコクスインドゥストリンス・テクニスカ・フォルスクニングスインスティトゥート・アクチボラゲット Apparatus and method for measuring the speed of a moving paper web
US8080131B2 (en) 2007-07-06 2011-12-20 Stfi, Skogsindustrins Tekniska Forskningsinstitut Ab Device and method for measuring the velocity of a moving paper web

Also Published As

Publication number Publication date
JPS5920103B2 (en) 1984-05-10

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