System for measuring characteristics of an object's motion

Details System for measuring characteristics of an object's motion System for measuring characteristics of an object's motion

1978-02-01

1979-12-25

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

324178, G01D 2104

Patent

active

041807260

ABSTRACT:
One embodiment of the subject invention comprises a device in which the passage of an object through first and second closely spaced parallel, pulsed, infrared beams is detected, to provide an elapsed time and/or speed indication. The beams are synchronously pulsed at a sufficiently high frequency that the interpulse periods are relatively short compared to the anticipated minimum elapsed time of the passage of the object through the beams, and beam interruptions are detected within a single interpulse period. In one embodiment of the invention, a third beam, in conjunction with one of the other two beams, is used to measure a second speed value, which is compared to the speed value measured between the first and second beams so as to ascertain if the object is accelerating or decelerating. Measured speed values are displayed on a multiplexed, multi-segment display, as well as being applied to a calculator or processor unit for the computation of preselected functions of the measured speed values. The display also provides an indication as to whether the object is accelerating or decelerating.

REFERENCES:
patent: 3805061 (1974-04-01), De Missimy et al.
patent: 3907429 (1975-09-01), Kuhn et al.
patent: 4128761 (1978-12-01), Oehler

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