DEVICE FOR PROCESSING SIGNAL OF LASER DOPPLER ANEMOMETER Russian patent published in 1994 - IPC

FIELD: measurement technology. SUBSTANCE: signal of laser Doppler anemometer is applied to input of input filter which is controlled by voltage. Signal from output of the filter enters parallel to signal outputs of comparators: control level comparator, the first threshold level comparator and the second threshold level comparator. Outputs of comparators are connected in pairs to gate pulse and count pulse formers. One input of gate pulse former has inverter. Logic circuit which is formed by four AND gates, delay line, two-input logic adder, shift register and short pulse former, generates input signal for integrator which regulates filter operation. Logic circuit generates count and gate signals either which are applied to inputs of frequency demodulator and digital meter of average speed. EFFECT: improved precision of measurement due to increase in frequency of useful information selection from input signal of laser Doppler anemometer. 2 dwg