A simple common path polarization interferometer was proposed to measure a roll angle change by using a Zn-indiffused lithium niobate waveguide phase modulator for optical homodyne metrology. A phase retardation plate was used for a roll angle sensor. The phase delay between two orthogonal polarizations of a probe light is dependent on the angular displacements of the roll sensor.Experimental results have shown that the roll angle measurement resolution is 0.005° in a ±0.5° range.
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