The simultaneous measurement of the linear displacement and two rotation angles (yaw and pitch) of a moving object using a laser sensor based on the self-mixing effect is reported. The laser head includes three commercial diode lasers equipped with monitor photodiodes. The target is a plane mirror attached to the moving object. The linear and angular resolutions are 0.7μm and0.8× 10-3∘(2.7 arcsec), respectively. The linearity of the sensor response has been verified over a range of 1 m and±0.4∘. Using three retroreflector prisms with a diameter of 10 mm instead of the plane mirror, the angular range of yaw and pitch has been improved by one order of magnitude.
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Ottonelli et al. (2008) studied this question.