Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Using radiant energy
Patent
1986-05-28
1987-09-15
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Using radiant energy
350370, 350371, 350374, 350375, 350384, 350387, 356364, 356365, G01R 1900, G01R 1507, G01B 1100
Patent
active
046942432
ABSTRACT:
Physical quantities such as pressures, accelerations and electrical currents including d-c currents are measured by alternately passing polarized and unpolarized light through an optical-sensor which modifies the polarization of the polarized light in proportion to the magnitude of the physical quantity while passing the unpolarized light unaltered by the physical quantity. The polarized and unpolarized light are generated by separate light sources which generate light at two different wavelengths and a polarizer which is effective to polarize light of the one wavelength but not the other. Light emerging from the sensor is converted into an electrical signal by an analyzer and a photodetector. The intensity of the light generated by the two sources is adjusted so that the electrical signal generated in response to the polarized light is substantially equal to that generated in response to the unpolarized light so that by subtracting the signal generated by the unpolarized light from that generated in response to the polarized light the component of the later proportional to the magnitude of the physical quantity is extracted. The subtraction is effected in an exemplary embodiment by comparing the electrical signal to a reference signal and adjusting the intensity of the unpolarized light to drive the difference between the electrical signal generated by the unpolarized light and the reference signal to zero, and then using the difference between the electrical signal generated by the polarized light and the reference signal as the output proportional to the magnitude of the physical quantity.
REFERENCES:
patent: 4147979 (1985-04-01), Baues et al.
patent: 4540937 (1985-08-01), Asars
Measurement of Pressure by Photoelastic Effects, by: G. Martens.
Multimode Fiber-Optic Hydrophone Based on the Photoelastic Effect, by: W. B. Spillman, Jr., and D. H. McMahon.
Asars Juris A.
Miller Robert C.
Abeles Daniel C.
Baker Stephen M.
Eisenzopf Reinhard J.
Westinghouse Electric Corp.
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