Optics: measuring and testing – Range or remote distance finding – With photodetection
Patent
1991-09-17
1993-03-09
Hellner, Mark
Optics: measuring and testing
Range or remote distance finding
With photodetection
356342, 358 99, G01C 308
Patent
active
051929783
ABSTRACT:
The present invention employs an optical filter which rejects substantially all wavelengths except for a selected wavelength. This invention eliminates most optical noise (e.g., solar noise) in LIDAR (light detection and ranging) imaging systems as well as LIDAR bathymetry systems and underwater submarine communication systems. The selected wavelength corresponds to the transmission wavelength of the laser. In accordance with the LIDAR systems of the present invention, a laser beam of the selected wavelength is projected at a body of water wherein a return beam is generated. The reflected or backscattered return beam is collected by optics which then directs the beam at the filter. The beam is filtered so that substantially all other wavelengths not corresponding to the selected wavelength are rejected, thereby eliminating most optical noise, particularly solar noise. The filtered beam is then detected. In accordance with the underwater communication system of the present invention, an encoded laser beam of the selected wavelength is projected at an underwear location (e.g., submarine). This beam is collected by optics which then directs the beam at the filter. Again, the beam is filtered so that substantially all other wavelengths not corresponding to the selected wavelength are rejected, thereby eliminating most optical noise, particularly solar noise. The filtered beam is then detected and provides a signal to be decoded.
REFERENCES:
patent: 3862257 (1989-08-01), Ulich
patent: 4963024 (1990-10-01), Ulich
patent: 5013917 (1991-05-01), Ulich
patent: 5034810 (1991-07-01), Keeler
patent: 5091778 (1992-02-01), Keeler
Hellner Mark
Kaman Aerospace Corporation
LandOfFree
Apparatus and method for reducing solar noise in imaging lidar, does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Apparatus and method for reducing solar noise in imaging lidar, , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus and method for reducing solar noise in imaging lidar, will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-213541