delicate strain gauge using is to measure mechanical loads and stresses

摘要

This invention discloses a mechanical stress measurement system which utilizes a birefringent coating and spectral demodulation to determine the magnitude and angular orientation of the stresses in a mechanical element from which the loads acting on that mechanical element are calculated. The invention provides for the measurement of Torque, Axial and Bending loads in a shaft, whether they exist singularly or in combination, without the requirement for electrical, mechanical or physical contact with the shaft, and is able to determine the magnitude and sense of the torque and axial loads, and the magnitude and plane of the bending load.