Optics: measuring and testing – Range or remote distance finding – With photodetection
Patent
1992-12-10
1993-10-05
Hellner, Mark
Optics: measuring and testing
Range or remote distance finding
With photodetection
356 4, G01C 308
Patent
active
052510000
ABSTRACT:
To measure a distance between two running vehicles a measurement signal is first generated by irradiating a light beam toward an article to be measured and then receiving the reflected light beam from the article. A reference signal and the measurement signal generated in the above way are input to a digital mix-down circuit which comprises two-stage flip-flop circuit to determine a phase difference between the reference signal and the measurement signal. The apparatus includes a clock delay circuit for delaying the high-going (rising) edge of the measurement signal while the reference signal is going high at an output terminal of a flip-flop circuit on the input side of the digital mix-down circuit, and a data delay circuit for delaying the down-going (falling) edge of the reference signal input into a data terminal of the flip-flop circuit. Usually, the clock delay circuit is electrically connected to the digital mix-down circuit via the data delay circuit, while the data delay circuit is electrically connected directly to the digital mix-down circuit. Alternatively, both the clock delay circuit and the data delay circuit may be electrically connected directly to the digital mix-down circuit.
REFERENCES:
patent: 4615617 (1986-10-01), Frank et al.
patent: 4620788 (1986-11-01), Giger
patent: 4699508 (1987-10-01), Bolkow et al.
patent: 4859054 (1989-08-01), Harrison
patent: 5050986 (1991-09-01), Gatto et al.
Iwasaki Kazuhisa
Kimura Shigeru
Kitamura Hideki
Ohmamyuda Yukio
Senoo Yasushi
Hellner Mark
Stanley Electric Co. Ltd.
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