Device for establishing a condition at the surface of a subject

Details Device for establishing a condition at the surface of a subject Device for establishing a condition at the surface of a subject

1977-11-16

1980-02-26

McGraw, Vincent P.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

356446, 356447, 356371, C01B 902, G01N 2148, G01B 1130

Patent

active

041903676

ABSTRACT:
A device for establishing the magnitude of irregularities at a surface includes a laser directing a beam of light, obliquely towards said surface, a photodetector mounted so as to catch a beam of light reflected from an irregularity at said surface, and a diffraction grating mounted in the path of a beam, mirror-image reflected from said surface and movable in relation thereto. The photodetector is provided with means for measuring the frequency and the amplitude of the time-dependent photocurrent caused by the interaction between the beam reflected from the irregularity and a further beam deflected by the diffraction grating from the mirror-image reflected beam.
In a modified version the device may be used for measuring flow velocity, the laser and the photodetector being mounted to opposite sides of a flow path defined by transparent walls.

REFERENCES:
patent: 4097160 (1978-06-01), Yataki et al.

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