Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1982-06-07
1985-04-09
Smith, Alfred E.
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
358294, 2503541, 33127, H04N 1024, G01J 100
Patent
active
045103909
ABSTRACT:
An electronic apparatus is used to measure distance by the detection and counting of a train of hot spots. The apparatus essentially comprises a heat producing means, a hot spot detecting means and electronic circuitry for energizing the heat producing means in response to the detection of a hot spot by the hot spot detecting means, whereby a train of hot pulses is produced that are spaced by the distance L between the heat producing and hot spot detecting means. A counter is used to record the number of hot spots detected by the hot spot detecting means. As the apparatus is moved, the device measures distance in increments of the separation L. An alternative embodiment is disclosed that produces two hot spots simultaneously and uses a single hot spot detecting means. The apparatus is preferably employed as part of the position reckoning means in a microcopier. However, other applications such as measuring the distance on maps, are also possible.
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Fields Carolyn E.
Smith Alfred E.
Woodbridge Richard C.
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