Optics: measuring and testing – Range or remote distance finding – With photodetection
Patent
1985-08-23
1988-03-29
Blum, Theodore M.
Optics: measuring and testing
Range or remote distance finding
With photodetection
250342, 330295, G01C 308, H03F 368
Patent
active
047339616
ABSTRACT:
An integrated laser/FLIR rangefinder has a laser energy detector generating an electrical signal in response to impinging laser energy, a preamplifier for amplifying the signal and a post amplifier for selectively shaping the signal output of the preamplifier. The preamplifier has a plurality of transistors connected in parallel provided for substantially reducing noise, a summing circuit sums the outputs of the plurality of transistors, and a trans-resistance amplifier produces a low impedance voltage difference output. The post amplifier includes a delay line and an operational amplifier having a positive terminal and a negative terminal. The positive terminal of the operational amplifier and a first end of the delay line are connected to the trans-resistance amplifier for delaying the output of the trans-resistance amplifier. A second end of the delay line is connected to the negative terminal of the operational amplifier. The operational amplifier combines the delayed and undelayed output of the trans-resistance amplifier and produces a spiked-type difference voltage signal. A low noise frequency compensation circuit allows detectors with what is normally considered inadequate bandwidth to be used to detect the laser return pulses and still produce a reasonably fast pulse with a low noise-level suitable for rangefinding.
REFERENCES:
patent: 4153366 (1979-05-01), Mamon et al.
patent: 4195267 (1980-03-01), Stanley
J. Markus, Guidebook of Electronic Circuits, 1974, pp. 33, 257, 258, 394, 395.
J. Markus, Guidebook of Electronic Circuits, 1974, p. 262.
Osche et al., "CO.sub.2 Laser-Forward Looking Infrared (FLIR) Integration Concepts", 1980, pp. 57-64, SPIE, vol. 227.
Blum Theodore M.
Comfort James T.
Robinson Richard K.
Sharp Melvin
Texas Instruments Incorporated
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