Optics: measuring and testing – Range or remote distance finding – With photodetection
Patent
1992-05-01
1994-04-26
Hellner, Mark
Optics: measuring and testing
Range or remote distance finding
With photodetection
356 28, G01C 308
Patent
active
053071387
ABSTRACT:
Disclosed is an apparatus for transmitting an optical signal. The apparatus includes a transmitter (12, 14, 18, 20, 26) for transmitting a burst of optical radiation, the burst including first periods of optical radiation having a first wavelength (.lambda..sub.1) and second periods of optical radiation having a second wavelength (.lambda..sub.2). The first and second periods alternate with one another for a duration of the burst, and each of the periods begins with substantially zero transmitted power, increases to a maximum transmitted power, and decreases to substantially zero power. Also disclosed is a receiver (30) and demodulator (90) that includes a wavelength separator (DG) for separating the received optical radiation into a first portion comprising of radiation of wavelength .lambda..sub.1 and a second portion comprising of radiation of wavelength .lambda..sub.2. First and second detectors (D1, D2) are responsive to the first and second portions, respectively, for converting the portions into first and second electrical signals, respectively. Circuitry (38, 40, 46) is responsive to the first and to said second electrical signals for determining a doppler shifted difference frequency component thereof (.DELTA.f) that is a result of a relative movement of an object with respect to the apparatus.
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patent: 5001338 (1991-03-01), Boero
patent: 5164733 (1992-11-01), Nettleton et al.
Denson-Low Wanda K.
Hellner Mark
Hughes Aircraft Company
Sales Michael W.
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