Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1987-05-04
1988-04-05
Britton, Howard W.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
356 1, 356 4, 356376, 364561, H04N 718
Patent
active
047362472
ABSTRACT:
A video controlled solid state range finding system includes an opto-electric camera and a helium neon laser. The laser applies coherent light to a beam splitter which applies a reference beam to the camera and an outgoing beam to a first angularly variable reflector which directs the outgoing beam to the object. An incoming beam from the object is reflected to a second angularly variable reflector and thus to the camera via the beam splitter. The first and second reflectors are configured with respect to the beam splitter so that the distance D travelled by the outgoing beam is the same as the distance travelled by the incoming beam from the second reflector to the beam splitter. The reference beam produces a reference signal and the incoming beam produces an object signal at the camera. The difference between the reference and object signals is used to vary the angle A between the outgoing beam and the reference line (31), and the angle B between the incoming beam and the reference line. The angles A and B are maintained essentially equal. The difference between the reference signal is used to provide an input to a rotator driven circuit to vary the angles of the first and second reflectors until the reference signal and object signal are coincident. Range R is then determined as R=D tan A.
REFERENCES:
patent: 3895870 (1975-07-01), Cullen et al.
patent: 4009960 (1977-03-01), Feldman et al.
patent: 4349838 (1982-09-01), Daniel
patent: 4502785 (1985-03-01), Truax
patent: 4627734 (1986-12-01), Rioux
Epperly Walter L.
Graham Olin L.
Russell Jim K.
Barr Hardie R.
Britton Howard W.
Fein Edward K.
Kostak Victor R.
Manning John R.
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