Wideband electronic block of laser interferometric system for measurements of quick-changing angle of scanner rotor rotation

摘要

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 $pi@/2 for this velocity. We developed electronic block for interferometric system of `direct current', which doesn't impose significant restrictions on the velocity characteristics. When frequency f of photoreceiver output signals exceeds chosen reference frequency f$-r$/ $EQ 100 $DIV 200 kHz, the sign of velocity is stored and is used in process of measurements for count pulses while f $GRT f$-r$/. 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.