Non-electrical monitoring of a physical condition

Details Non-electrical monitoring of a physical condition Non-electrical monitoring of a physical condition

1988-11-14

1990-03-27

Woodiel, Donald O.

Measuring and testing

Fluid pressure gauge

Photoelectric

73729, 25023119, G01L 706

Patent

active

049110152

ABSTRACT:
A method for monitoring temperature or pressure by the steps of: providing a light path (30-42) having a light attenuating characteristic which is substantially independent of light wavelength, at least with respect to a given wavelength range; conducting light having different first and second wavelengths which are in the given wavelength range along the light path (30-42); controlling the intensity of the radiation along the light path (30-42) as a function of the temperature or pressure to be monitored and the light wavelength; producing (76-82): four signals having values representing the light intensity at, respectively: the output end of the path for light having the first wavelength; the input end of the path for light having the first wavelength; the output end of the path for light having the second wavelength; and the input end of the path for light having the second wavelength; and deriving (86-90) an output signal having a value representing the ratio of the mathematical product of the values of the first and fourth signals to the mathematical product of the values of the second and third signals.

REFERENCES:
patent: 4368645 (1983-01-01), Glenn et al.
patent: 4495819 (1985-01-01), Tekippe
patent: 4515473 (1985-05-01), Mermelstein
patent: 4612810 (1986-09-01), Martens

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