Optical distance measuring apparatus

Details Optical distance measuring apparatus Optical distance measuring apparatus

2006-10-30

2008-08-26

Tarcza, Thomas H. (Department: 3662)

Optics: measuring and testing

Range or remote distance finding

With photodetection

Reexamination Certificate

active

07417718

ABSTRACT:
In an optical distance measuring apparatus, a transmitter has a light-emitting device emitting an optical signal synchronized with a modulating signal having a predetermined repetition frequency, and a modulating signal generator outputting the modulating signal to the light-emitting device. A receiver has a photodetector receiving an optical beam reflected by an object to be measured and converting it to an electrical signal, a switch receiving the signal from the modulating signal generator and alternately choosing two channels for the electrical signal with a predetermined timing, and first and second storage sections storing electrical signals on the two channels. A signal processing section has a differential operation section performing a differential operation on electrical signals stored in the first and second storage sections, and a distance determining section determining a distance to the object on the basis of the result of the differential operation of the differential operation section.

REFERENCES:
patent: 5107449 (1992-04-01), Ikuta
patent: 5608514 (1997-03-01), Stann et al.
patent: 6246468 (2001-06-01), Dimsdale
patent: 6-18665 (1994-01-01), None
patent: 7-294642 (1995-11-01), None
patent: 2004-294420 (2004-10-01), None
Miyagawa et al., “CCD-Based Range-Finding Sensor”, IEEE Transactions on Electron Devices, vol. 44(10), pp. 1648-1652 (1997).

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