ERRORS OF DIGITAL METHODS OF MEASURING THE FREQUENCY OF THE SINGLE-FREQUENCY SIGNAL OF A LASER-DOPPLER ANEMOMETER

An error analysis is made for the electronic processor a laser Doppler anemometer (LDA), using digital methods of measuring the frequency of the Doppler signal. We consider a method for evaluating the period of the high-frequency filling of the LDA signal from the coordinates of the ''zero'' of the process and a method for estimating the signal fre quency from the position of the maximum value of the spectral density. The results reported show that the limiting values of the total error of measurement of the LDA signal frequency can be decreased to 0.1-0. 3%.