Measuring angular speed with sensitive ring interferometer - uses long coherence duration source and phase noise light modulation

摘要

Light emitted from the night source can be used to break from the phase relationship between the disturbance light components and the useful light components. The modulation is a phase modulation achieved using an optical modulator (MOD) or using a generator of sound conducted through a solid or air. The modulation causes phase noise in the light which produces an electrical signal in a photodetector (D) whose output is analysed after passing through an electrical filter (TP) whose upper limit frequency is small compared to the reciprocal of the product of 2Pi and the transition time through a static light path (L).