| 摘要 |
Method for processing echo-signal at measurement of distance in waveguides includes emission of sound to measuring tube (wave guide) with liquid placed there, obtaining echo-signal from surface of liquid and calculation of distance to it by average velocity of sound. Wave dimension of measuring tube is chosen with account of possibility of propagation of waves of 0-th and1-st stage there, with determination of time delay of echo-signal of the 0-th stage, and echo-signal of wave of 1-st stage undergoes spectral-time processing, one finds its phase spectrum and time delay at working frequency. After that by those data one restores linearity of its phase spectrum with performance of reverse Fourier transformation. After that echo-signal of the 1-st normal wave obtained in such way undergoes repetitive processing with repetitive calculation of adjusted value of its time delay by that very method, with determination of average velocity of sound in waveguide by delays obtained for waves of the 0-th and 1-st stages. Distance to liquid is found as semi-product of delay of the wave of 0-th stage by average velocity of sound obtained. |
