Apparatus for measuring speed
First Claim
1. An apparatus for measuring speed with respect to an object, comprising first and Nth sensors where N is greater than two arranged to be sensitive to energy received from first to Nth consecutive regions, respectively, of the object to form sensor signals, signal delay means for forming delayed signal by delaying the sensor signals from at least said second to Nth sensors such that a time delay for each ith of the sensor signal is greater than a time delay for each (i-1)th of the sensor signals for 1<
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N, and first difference forming means for forming a difference between a sum of the delayed signals of ever numbered ones of said sensors and a sum of the delayed signals of odd numbered ones of said sensors.
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Accused Products
Abstract
An apparatus for measuring speed with respect to an object comprises first to Nth sensors sensitive to energy received from first to Nth consecutive regions, respectively, of the object. Signal delay means are provided to delay the signals from the second to Nth sensors, the delay increasing with sensor number. A subtractor is provided to form the difference between the sum of the signals of the even-numbered sensors and the sum of the signals of the odd-numbered sensors.
13 Citations
19 Claims
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1. An apparatus for measuring speed with respect to an object, comprising first and Nth sensors where N is greater than two arranged to be sensitive to energy received from first to Nth consecutive regions, respectively, of the object to form sensor signals, signal delay means for forming delayed signal by delaying the sensor signals from at least said second to Nth sensors such that a time delay for each ith of the sensor signal is greater than a time delay for each (i-1)th of the sensor signals for 1<
- i≦
N, and first difference forming means for forming a difference between a sum of the delayed signals of ever numbered ones of said sensors and a sum of the delayed signals of odd numbered ones of said sensors. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification