Optics: measuring and testing – Range or remote distance finding – With photodetection
Patent
1994-12-20
1996-10-08
Tarcza, Thomas H.
Optics: measuring and testing
Range or remote distance finding
With photodetection
356 508, G01C 308
Patent
active
055637019
ABSTRACT:
An apparatus and a method for measuring a distance optically using a phase variation. The apparatus comprises a light emitting circuit for emitting a high-power intermittent pulse light beam to an object, a light receiving circuit for receiving a light beam reflected from the object, a signal generation/phase difference detection circuit for generating first and second pseudo intermittent pulse signals in response to a drive signal from the light emitting circuit and an output signal from the light receiving circuit, respectively, detecting a phase difference between the generated first and second pseudo intermittent pulse signals and measuring a phase-delayed time on the basis of the detected phase difference, and a controller for performing a control operation in response to an output signal from the signal generation/phase difference detection circuit. The first and second pseudo intermittent pulse signals are multiplied by a reference pulse signal, the multiplied signals are low pass filtered and the low pass filtered signals are phase-compensated, respectively. A phase difference between the two phase-compensated signals is detected and a light moving time is calculated on the basis of the detected phase difference. The distance to the object is calculated on the basis of the calculated light moving time.
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Hyundai Electronics Industries Co,. Ltd.
Laufer Pinchus M.
Tarcza Thomas H.
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