| 摘要 |
PROBLEM TO BE SOLVED: To provide a measurement device capable of appropriately extracting a desired echo even when the self-correlation range side lobe of an unnecessary echo occurs in the case of code-modulating a transmission signal, and emitting an ultrasonic wave.SOLUTION: The measurement device includes: a code modulation part for generating a modulation signal by modulating a transmission signal by a code sequence; a transmission part for generating an electric signal for generating an ultrasonic wave on the basis of the modulation signal; a reception part for generating a reception signal on the basis of an electric signal corresponding to a reflected wave from a specimen; a saturation processing part for, when the reception signal exceeds a predetermined saturation threshold, generating a saturation processing signal by changing the reception signal to a saturation threshold; a code demodulation part for generating a demodulation signal by code-demodulating the saturation processing signal; and a flaw detection processing part for detecting a desired echo from the demodulation signal by using a predetermined detection threshold. |
