Patent ID: 8806947

Claim:
An ultrasonic wave propagation time measurement system, comprising: a transmitting section that transmits an electromagnetic wave signal indicating a transmission timing and an ultrasonic wave signal, and a receiving section that detects the transmitted electromagnetic wave signal and the ultrasonic wave signal and calculates an ultrasonic wave propagation time based on reception times of the electromagnetic wave signal and the ultrasonic wave signal, wherein; an initial mode setting mechanism that constitutes an optimum ultrasonic wave transmission/reception system by selecting one or more set values of setting parameters is provided in a controlling unit that controls transmission of the signals in the transmitting section and in a data processing unit that controls the detection and the calculation in the receiving section; and the transmitting section comprises: an electromagnetic wave transmitting unit that is driven by an electromagnetic wave driving unit and transmits the electromagnetic wave signal indicating transmission timing, an ultrasonic wave driving signal generating unit that generates an ultrasonic wave driving signal by modulating an ultrasonic wave at the same time of the transmission of the electromagnetic wave signal based on a pseudo random signal of high self-correlativity, and an ultrasonic wave transmitting unit that is driven by the ultrasonic wave driving signal and transmits an ultrasonic wave signal having a higher frequency than a basic frequency of the ultrasonic wave driving signal.