Landslide detecting apparatus having improved optical unit

Details Landslide detecting apparatus having improved optical unit Landslide detecting apparatus having improved optical unit

1991-08-09

1993-01-05

Ng, Jin F.

Communications: electrical

Condition responsive indicating system

Specific condition

340540, 2502311, 25023119, 250237R, 73784, G08B 2100

Patent

active

051774712

ABSTRACT:
A landslide detecting apparatus which is laid under the ground include: a light source; a lens device for converting a beam of light from the light source into a parallel pencil of rays; a condensing lens device; a light detecting device; and a shading mechanism adapted to partly or entirely intercept the pencil of rays in response to external pressures applied thereto. Any change in the earth's crust in a direction to cause a landslide causes the shading mechanism to operate in correspondence with the magnitude of the change so as to partly intercept the parallel pencil of rays and cause a change in the quantity of light detected, making it possible to obtain a quantitative knowledge of the change in the earth's crust. A landslide detecting apparatus may have a plurality of detection units arranged three-dimensionally and radially, each detection unit being equipped with a shading mechanism adapted to operate in correspondence with external pressures applied thereto, a row of light emitting light elements and a row of light receiving elements opposed to each other, the shading mechanism being adapted to intervene between these rows of light emitting and light receiving elements in proportion to external pressures applied thereto.

REFERENCES:
patent: 2000425 (1935-05-01), Strauss
patent: 3742233 (1973-06-01), Gorgens
patent: 3835316 (1974-09-01), Checchetti
patent: 4493212 (1985-01-01), Nelson
patent: 4539851 (1985-09-01), Lutenegger

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