Optics: measuring and testing – By particle light scattering – With photocell detection
Patent
1995-10-10
1997-11-18
Turner, Samuel A.
Optics: measuring and testing
By particle light scattering
With photocell detection
359191, G01B 902
Patent
active
056893353
ABSTRACT:
Apparatus and method for heterodyne-generated, two-dimensional detector array using a single detector. Synthetic-array heterodyne detection, permits a single-element optical detector to behave as though it were divided into an array of separate heterodyne detector elements. A fifteen-element synthetic array has successfully been experimentally realized on a single-element detector, permitting all of the array elements to be read out continuously and in parallel from one electrical connection. A CO.sub.2 laser and a single-element HgCdTe photodiode are employed. A different heterodyne local oscillator frequency is incident upon the spatially resolvable regions of the detector surface. Thus, different regions are mapped to different heterodyne beat frequencies. One can determine where the photons were incident on the detector surface even though a single electrical connection to the detector is used. This also prevents the destructive interference that occurs when multiple speckles are imaged (similar to spatial diversity), In coherent LIDAR this permits a larger field of view. An acoustooptic modulator generates the local oscillator frequencies and can achieve adequate spatial separation of optical frequencies of the order of a megahertz apart.
REFERENCES:
patent: 3571507 (1971-03-01), Korpel
patent: 3858203 (1974-12-01), Constant
patent: 4305666 (1981-12-01), Becherer et al.
patent: 5353109 (1994-10-01), Langdon et al.
Freund Samuel M.
The Regents of the University of California
Turner Samuel A.
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