Ladar Transmitter with Induced Phase Drift for Improved Gaze on Scan Area Portions
First Claim
Patent Images
1. A method comprising:
- scanning a first mirror and a second mirror at different sinusoidal frequencies to define a Lissajous scan pattern within a scan area; and
inducing a periodic phase drift in the scanning of at least one of the first and second scannable mirrors.
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Abstract
Disclosed herein is a scanning ladar transmitter that employs an optical field splitter/inverter to improve the gaze characteristics of the ladar transmitter on desirable portions of a scan area. Also disclosed is the use of scan patterns such as Lissajous scan patterns for a scanning ladar transmitter where a phase drift is induced into the scanning to improve the gaze characteristics of the ladar transmitter on desirable portions of the scan area.
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Citations
28 Claims
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1. A method comprising:
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scanning a first mirror and a second mirror at different sinusoidal frequencies to define a Lissajous scan pattern within a scan area; and inducing a periodic phase drift in the scanning of at least one of the first and second scannable mirrors. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A beam scanner apparatus for a ladar transmitter, the apparatus comprising:
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a first scannable mirror configured to scan to a plurality of scan positions; a second scannable mirror positioned optically downstream from the first scannable mirror, the second scannable mirror configured to scan to a plurality of scan positions, wherein the scan positions of the first and second scannable mirrors define where the ladar transmitter is targeted within a scan area; and a beam scanner controller configured to drive the first scannable mirror and the second scannable mirror to scan at sinusoidal frequencies such that the first scannable mirror is driven at a first sinusoidal frequency while the second scannable mirror is driven at a second sinusoidal frequency, the first and second sinusoidal frequencies cooperating together to so that the ladar transmitter targets within the scan area according to a Lissajous scan pattern; and wherein the beam scanner controller comprises; a first driver for controllably scanning the first scannable mirror; a second driver for controllably scanning the second scannable mirror; and a processor configured to compute a periodic phase drift and provide a control signal to at least one of the first and second drivers that induces the computed periodic phase drift in the scanning of at least one of the first and second scannable mirrors. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. A method comprising:
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scanning a first mirror and a second mirror to define a spiral scan pattern within a scan area, wherein the scanning comprises scanning the first mirror at a dampened transient resonant frequency; and inducing a periodic phase drift in the scanning of the first mirror. - View Dependent Claims (28)
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Specification