Instrumentation for surveying underground cavities

Details Instrumentation for surveying underground cavities Instrumentation for surveying underground cavities

1980-10-09

1982-05-25

Orsino, Jr., Joseph A.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

356 1, H04N 718

Patent

active

043319750

ABSTRACT:
Instrumentation that can be lowered into an underground cavity to measure the dimensions of the cavity and also, as an added option, the ability to take photographs of the area of interest. The basic structure making up the preferred embodiment has a mounting frame with a television camera, a light beam assembly having two separate aligned light sources, and a mechanism to raise/lower the frame and also to tilt the light beam assembly. Above the ground is an appropriate readout unit which relates the angle of tilt for one of the light beam sources to a value of an electrical signal. To determine the distance from the aligned light source to the cavity surface, the light beams are superimposed upon one another to form a spot on the surface whose distance from the sources is to be measured. This spot is observed on the television camera and the signal magnitude (voltage) corresponding to the angle of tilt of the light source noted. By keeping the other light source rigid relative to the frame and knowing the fixed distance between the two light sources and the angle of tilt, it is possible by simple trigonometry to determine the distance in question. If visual detail greater than that observable with a television camera is desired, a remotely triggered flash camera may also be attached to the frame to photograph the surface under observation.

REFERENCES:
patent: 3620625 (1977-11-01), Tegholm
patent: 4063283 (1977-12-01), Rider et al.
patent: 4180322 (1979-12-01), Farcinade

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