Wideband electronic block of laser interferometric system for measurements of quick-changing angle of scanner rotor rotation
Viktor P. Bessmel'tsev, V. N. Burnashov · Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 1996
The most simple interferometric systems of the `direct current' have relatively low maximum of permissible velocity of displacement of interferometer reflectors because of inability of providing of shift of phase of photoreceiver output signals equal to (pi) /2 for this velocity. We developed electronic block for interferometric system of `direct current', which doesn't impose significant restrictions on the velocity characteristics. When frequency f of photoreceiver output signals exceeds chosen reference frequency fr equals 100 divided by 200 kHz, the sign of velocity is stored and is used in process of measurements for count pulses while f > fr. This method doesn't demand the shift of signal phases to be equal to (pi) /2 for the normal performance of block. The analysis of the results of joint processing of output signals of photoreceivers shows that frequency of output and input signals of photo-receiver may be considered as signed value, which sign is determined by the displacement direction of one of interferometer reflectors.