JPS54130168A - Speed detector - Google Patents
Speed detectorInfo
- 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
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
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)
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 |
-
1978
- 1978-03-31 JP JP3751378A patent/JPS5920103B2/en not_active Expired
Cited By (4)
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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