Method of position monitoring and apparatus therefor

Details Method of position monitoring and apparatus therefor Method of position monitoring and apparatus therefor

1988-11-14

1990-08-21

Howell, Janice A.

Radiant energy

Invisible radiant energy responsive electric signalling

Neutron responsive means

356 32, 378 70, 73801, G01B 1506

Patent

active

049508989

ABSTRACT:
Displacement or strain is measured by applying to a body to be monitored at least one grid line (two or more where strain measurements are required) and scanning a radiation beam such as a laser beam across or partly across the grid line(s) to produce a pulsed output from which the mean position(s) of the grid line(s) can be ascertained with reference to a datum point on the beam scanning path. Displacement of each grid line relative to the datum point can be determined. The beam scan may be adjustable to produce a null condition in which the mean position of the grid line(s) coincides with the mid-point of the beam scan. Any deviation from the null condition then indicates displacement of the body or strain thereof.

REFERENCES:
patent: 3985444 (1976-10-01), Takashima et al.
patent: 4525068 (1985-01-01), Mannava et al.
patent: 4605857 (1980-08-01), Ninomiya et al.
patent: 4854709 (1989-08-01), Nehnert et al.

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