Apparatus for the measurement of the stress birefringence of an

Details Apparatus for the measurement of the stress birefringence of an Apparatus for the measurement of the stress birefringence of an

1987-03-05

1988-06-07

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356365, G02F 101, H01J 4014

Patent

active

047498544

ABSTRACT:
Apparatus for measurement of the stress birefringence of an optical sensor that is influenced by a quantity to be measured. An optical emitting device sends light of two adjacent wavelengths .lambda..sub.1 and .lambda..sub.2 through an emitting light guide and via a polariser and a retarder plate to the sensor. An analyser conducts mutually parallel polarization components of the light emerging from the sensor on a common path to a receiving and evaluating device which derives from the measured-value-dependent intensities of such polarization components information concerning the magnitude of the quantity to be measured. The thickness of the retarder plate is dimensioned to provide a path length w of the light through the retarder plate such that the two light components .lambda..sub.1 and .lambda..sub.2 that leave the analyzer are influenced in mutually opposite senses by the measured quantity via the sensor, so that they do not need to be separated by optical filters and combined again by a coupler.

REFERENCES:
patent: 3401590 (1968-09-01), Massey
patent: 3630622 (1971-12-01), de Lang
patent: 4400062 (1983-08-01), Mori et al.
patent: 4624563 (1986-11-01), Johnson

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