3D imaging laser radar

Details 3D imaging laser radar 3D imaging laser radar

1996-06-19

2000-10-17

Hellner, Mark

Optics: measuring and testing

Range or remote distance finding

With photodetection

250332, G01C 0308

Patent

active

06133989&

ABSTRACT:
A three dimensional imaging device is presented which uses single pulse from a pulsed light source for detecting objects enveloped by a light-transmitting medium such as the earth's atmosphere or free space. By means of switching off a ramping voltage, individually for each object pixel, the time of arrival of the reflected pulse is recorded. This time is related to the third object dimension. The device consists of the pulsed light source, optics for collecting the reflected light, a sensor for detecting the light, drive and output electronics for timing and signal conditioning of data generated by the sensors and a computer for processing the sensor data and converting it to a three dimensional image. The sensor collects and processes the light data in a unique manner, using a hybrid. The hybrid is actually a two dimensional array of collectors or detectors combined in very close proximity with their own processing electronics. In general, the hybrid is composed of two integrated circuit chips mated together. The two dimensional array defines two dimensions of the image. The processing electronics individually and independently switch off, at high-speed, a time varying voltage when the light pulse, reflected from the object, arrives at the sensor. The final voltages are stored and can be mathematically transformed to the third object dimension. The sensor also records peak light pulse information which can be used to obtain higher resolution in the third dimension.

REFERENCES:
patent: 5220164 (1993-06-01), Lieber et al.
patent: 5243541 (1993-09-01), Ulich
patent: 5446529 (1995-08-01), Stettner et al.

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