| 摘要 |
PROBLEM TO BE SOLVED: To make it possible to measure the flow velocity distribution of the velocity of a reflector present at a different position by applying Fourier trans form with the shift of an original point in accordance with circumstances obtained halfway through the process, and deriving the flow velocity distribution of the 2- or 3-dimensional vector component of the velocity of the reflector present at a different position. SOLUTION: If an element V is driven by a drive source 30, a pulsed sonic wave is repeated PP-times at an interval T of sending the sonic wave, and is sent from the front of a transducer Q2. A reflective signal, from a reflector, generated by the sending of the pulsed sonic wave is received by the element of the transducer Q2. The reflective signal generated at the time of t by the sending of the p-th. sonic wave, is received by the transducer Q2, then is diffused using an A/D converter 32, and a component difference processing is performed with a component difference processing filter 34 in order to remove a reflective signal from a standstill object. Further, the Fourier transform is performed using a one-dimensional Fourier transformer 36 and the Fourier transform is performed using a one-dimensional Fourier transformer 38 to repeat the process to obtain an output. |
