METHOD FOR MEASURING SPATIAL ROTATION ANGLES OF OBJECTS
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United States of America
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Jan 23, 2020
app pub date -
Jul 17, 2019
filing date -
Jul 17, 2019
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Abstract
The present invention discloses a method for measuring a spatial rotation angle of an object, comprising steps of: controlling projection of probe light onto an object whose rotation angle is to be measured; controlling a balance homodyne detector, by which the probe light reflected or transmitted by the object whose rotation angle is to be measured is detected to obtain light parameters of the reflected or transmitted probe light; and calculating a rotation angle of the object whose rotation angle is to be measured, according to the light parameters detected by the balance homodyne detector. The device of the present invention is simple, easy to operate, and high in practicality. The measurement precision is high, and measurements of a rotation angle beyond the SNL (shot noise limit) can be realized. The present invention can be applied in high-tech fields such as precise manufacturing, spatial remote-sensing and bioimaging.
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