Laser pulse detection method and apparatus

Optics: measuring and testing – By dispersed light spectroscopy – Utilizing a spectrometer

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G01C 1964

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active

046698825

ABSTRACT:
A sensor is described for detecting the difference in phase of a pair of returned light pulse components, such as the two components of a light pulse of an optical gyro. In an optic gyro, the two light components have passed in opposite directions through a coil of optical fiber, with the difference in phase of the returned light components determining the intensity of light shining on the sensor. The sensor includes a CCD (charge coupled device) that receives the pair of returned light components to generate a charge proportional to the number of photons in the received light. The amount of the charge represents the phase difference between the two light components. At a time after the transmission of the light pulse and before the expected time of arrival of the interfering light components, charge accumulating in the CCD as a result of reflections from optical components in the system, are repeatedly removed from the CCD, by transferring out charges in the CCD and dumping these charges.

REFERENCES:
patent: 3751166 (1973-08-01), Starkey et al.
patent: 3931463 (1976-01-01), Levine
patent: 4134677 (1979-01-01), Ling et al.
patent: 4197469 (1980-04-01), Cheung
patent: 4259592 (1981-03-01), Frungel et al.
"Limitation of Rotation Sensing by Scattering", Cutler et al., Optical Society of America, 11-1980, pp. 488-490.
"Mosaic Image Sensor Cell", Will, IBM Technical Disclosure Bulletin, S-1969, p. 1618.
W. C. Goss et al., "Fiber-Optic Rotation Sensor Technology", Applied Optics, vol. 19, No. 6 (1980).

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