SYSTEM FOR PROCESSING NOISE SIGNALS IN A NOISE AND ITS APPLICATION IN FRASER LASER VELOCIMETRY

摘要

P DEVICE FOR DETECTING THE APPEARANCE TIME AND FOR DETERMINING THE FREQUENCY OF A PERIODIC SIGNAL NOISE IN A NOISE, COMPRISING MEANS FOR CALCULATING IN REAL-TIME THE FUNCTION OF AUTOCORRELATION OF THIS SIGNAL AND DEDUCTING ITS FREQUENCY OF THE VALUE OF SELF-CORRECTING COEFFICIENTS, SAID DEVICE COMPRISING A DIGITAL ANALOG CONVERTER PERIODICALLY TRANSFORMING THE SIGNAL INTO Q-BIT SAMPLES, MEANS OF DELAYING THE SAMPLES OF A PREDETERMINED TIME AND MULTIPLE OF THIS TIME, MEANS OF MULTIPLYING THE SAMPLE CURRENT SUPPLIED BY THIS CONVERTER BY PREVIOUS DELAYED SAMPLES AND DIGITAL INTEGRATE TO INTEGRATE THE PRODUCTS OBTAINED, CHARACTERIZED BY THE FACT THAT THE MEANS OF DELAYING THE SAMPLES INCLUDE FIRST MEANS OF DELAY OF DT, 2DT ... NDT AND SECOND MEANS OF DELAY OF (N1) DT, (N2) DT ... 2NDT, THE TWO DELAY SERIES TO FORM A SLIDING AUTOCORRELATION FUNCTION. / P