Prismatic beam rotator for an optical beam projector

Details Prismatic beam rotator for an optical beam projector Prismatic beam rotator for an optical beam projector

1978-10-05

1980-06-24

Blum, Theodore M.

Aeronautics and astronautics

Aircraft sustentation

Sustaining airfoils

350 66, 244 313, G02B 2717

Patent

active

042092248

ABSTRACT:
A beam projector which is controlled to alternately transmit rectangular cross-sectional beams substantially parallel to a projection axis, wherein the beams are respectively pulse modulated over a correspondingly distinct pulse rate frequency range to supply yaw and pitch information and are respectively scanned in a direction correspondingly orthogonal to the cross-sectional length of each beam. The size format of the beam cross-sections and the angles of scan are controlled according to a predetermined time variable function. In a first time period, the largest cross-sectional beams are alternately transmitted and the scan angle is decreased as a function of time, so that a fixed area of detectable information is available for detection with respect to an imaginary orthogonal reference plane moving along the projection axis at a rate corresponding to the predetermined time variable function. In subsequent time periods proportionately smaller cross-sectional beams are transmitted and the scan angle is continually controlled. The disclosed embodiment employs the use of a single set of proportionately different size formatted cross-sectional laser sources as a radiation generator, a scanning mechanism, a vibrationally modulated Pechan type prism and a fixed focus optical system to effect alternately transmitted beams, of selectable cross-section, orthogonally oriented and scanned with respect to each other.

REFERENCES:
patent: 4020339 (1977-04-01), Gustafson
patent: 4123165 (1978-10-01), Brown et al.

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