Device for measuring the distance between the device and a measu

Details Device for measuring the distance between the device and a measu Device for measuring the distance between the device and a measu

1988-04-15

1990-02-13

Willis, Davis L.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

G01B 902

Patent

active

049001515

ABSTRACT:
A laser optical apparatus for measuring the distance between the apparatus and a measuring surface which comprises an optical measuring reflector on said measuring surface, a converting transformer for converting the position of said reflector into corresponding electrical signals and an indicator for said signals. The improvement comprises a first optical interferometer having a measuring wave guide coupled with a reference wave guide and a second optical interferometer also having measuring and reference wave guides. The length of the second measuring wave guide is different from the length of the second reference wave guide and a computer is used to compare output electrical signals the value of which depend upon this difference. The apparatus also includes a device to correct the wave length of the laser beam by controlling the electrical current to the laser.

REFERENCES:
patent: 4717255 (1988-01-01), Ulbers
patent: 4744661 (1988-05-01), Ulbers et al.

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