Optics: measuring and testing – Range or remote distance finding – With photodetection
Patent
1974-07-29
1980-12-02
Buczinski, Stephen C.
Optics: measuring and testing
Range or remote distance finding
With photodetection
356 4, 356371, 358 96, 358107, 358108, 358109, G01C 308, H04N 700
Patent
active
042368197
ABSTRACT:
Method and apparatus for showing the relative range from an active line scan sensor to a target, the changes in range being shown on a recording medium as an alternate series of bright and dark lines. In particular, a modulated laser beam having high frequency components is utilized to illuminate the target, the reflected energy received at the sensor having the same modulation frequency but phase modified by the transit time required to make the roundtrip from the sensor to the target and return. The phase difference between the received energy and the transmitted, or reference, energy is shown on the recording medium by directing a portion of the reference energy to a detector which is also responsive to the received energy.
Points in the image formed on the recording medium where the phase angles are the same can be made to appear white while the points where the phase angles differ by 180.degree. can be made to appear black. The difference in the range between two black lines is equal to a specific sub-interval of the wavelength of the effective laser modulation frequency, the sub-interval being l
where n is the harmonic of the effective laser modulation frequency.
The scanning laser may be a mode locked laser, thereby providing a light output having high frequency components and precise frequency and phase stability.
REFERENCES:
patent: 3360987 (1968-01-01), Flower et al.
patent: 3527533 (1970-09-01), Hook et al.
patent: 3565528 (1971-02-01), Witte
patent: 3634614 (1972-01-01), Geusic
patent: 3743418 (1973-07-01), Heflinger
patent: 3879133 (1975-04-01), Mathieu
patent: 3897150 (1975-07-01), Bridges et al.
Buczinski Stephen C.
Rusz Joseph E.
Shannon James S.
The United States of America as represented by the Secretary of
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