Photoelastic measuring transducer and accelerometer based thereo

Measuring and testing – Speed – velocity – or acceleration – Acceleration determination utilizing inertial element

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73800, 350371, 356 33, G01L 124, G01B 1118

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active

046482741

ABSTRACT:
A photoelastic transducer is constructed with a photoelastic element receiving a 45.degree. polarized light beam with a wave plate providing a 90.degree. phase displacement in its orthogonal components. The element has reflective surface coatings to produce multiple internal reflections so as to lengthen the optical path, and increase the sensitivity of the unit. Analysis of the orthogonal outputs can be according to the difference divided by the sum with one of the outputs being multiplied by the ratio of the D.C. component of the other output to its D.C. component, for the purpose of compensating for changes in tramsmission of the two signals. Alternatively, the signal analysis can be in accordance with the difference between the rates of change of the two signals with each rate of change being multiplied by a factor which is proportional to the square root of the ratio of the other signal to the present signal, for the purpose of compensating for changes in the wave plate dimensions due to factors such as temperature change.

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Spillman, Jr., Multimode Fiber-Optic Accelerometer Based on the Photoelastic Effect, Applied Optics, Aug. 1, 1982, vol. 21, No. 15.
Spillman, Jr. et al., Multimode Fiber-Optic Hydrophone Based on the Photoelastic Effect, Applied Optics, 10-1-82, vol. 21, No. 19.
Tai et al., Fiber-Optic Acceleration Sensor Based on Photoelastic Effect, Applied Optics, 6-1-83, vol. 22, No. 11.

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