Optics: measuring and testing – Velocity or velocity/height measuring – With light detector
Patent
1988-01-22
1989-10-24
Buczinski, Stephen C.
Optics: measuring and testing
Velocity or velocity/height measuring
With light detector
250559, G01P 336, G01N 2186
Patent
active
048757691
ABSTRACT:
A velocimeter and a method for measuring the velocity of a printing press web are provided. The velocity is measured without contacting the web by measuring a speckle pattern which is reflected off the moving web by a laser. The reflected light is filtered and detected by a linear photodetector array which is differentially connected. The photodetector array output is fed into a differential amplifier to obtain a differenced output which has a frequency that is related to the velocity of the web. The difference output is filtered through a variable filter set at a predetermined bandpass center frequency and bandwidth, and its frequency is counted to obtain the approximate velocity of the web. Using the approximate velocity, a bandpass center frequency and bandwidth is selected which provides a substantially linear response of velocity at the counted frequency. The variable filter is reset to the selected bandpass center frequency and bandpass, and the frequency of its output is obtained. The web velocity is then determined using a predetermined relationship between web velocity and frequency for the selected filter setting.
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Ogiwara et al., Japanese Journal of Applied Physics, vol. 14 (1975), Supplement 14-1, pp. 307-310.
Buczinski Stephen C.
Hamann H. Fredrick
Malin Craig O.
Rockwell International Corporation
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