ULTRASONIC WAVE TRANSMITTER DEVICE, ULTRASONIC WAVE PROPAGATION TIME MEASUREMENT SYSTEM AND ULTRASONIC WAVE PROPAGATION TIME MEASUREMENT METHOD
First Claim
1. An ultrasonic wave transmitter device, comprisingan ultrasonic wave driving circuit that modulates an ultrasonic wave based on a pseudorandom signal to generate an ultrasonic wave driving signal;
- andan ultrasonic wave transmitter, that driven by the ultrasonic wave driving signal sends out an ultrasonic wave signal of a frequency higher than a fundamental frequency of the ultrasonic wave driving signal;
the ultrasonic wave transmitter including a cylindrically-shaped piezoelectric or magnetostrictive element that sends out the ultrasonic wave signal, and an ultrasonic wave absorber that covers part of a base member that holds the piezoelectric or magnetostrictive element.
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Abstract
An ultrasonic wave transmitter device includes an ultrasonic wave driving circuit that modulates an ultrasonic wave based on a pseudorandom signal to generate an ultrasonic wave driving signal, and an ultrasonic wave transmitter driven by the ultrasonic wave driving signal to send out an ultrasonic wave signal of a frequency higher than a fundamental frequency of the ultrasonic wave driving signal. The ultrasonic wave transmitter includes a cylindrically-shaped piezoelectric or magnetostrictive element sending out the ultrasonic wave signal and an ultrasonic wave absorber that covers part of a base member holding the piezoelectric or magnetostrictive element.
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Citations
20 Claims
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1. An ultrasonic wave transmitter device, comprising
an ultrasonic wave driving circuit that modulates an ultrasonic wave based on a pseudorandom signal to generate an ultrasonic wave driving signal; - and
an ultrasonic wave transmitter, that driven by the ultrasonic wave driving signal sends out an ultrasonic wave signal of a frequency higher than a fundamental frequency of the ultrasonic wave driving signal; the ultrasonic wave transmitter including a cylindrically-shaped piezoelectric or magnetostrictive element that sends out the ultrasonic wave signal, and an ultrasonic wave absorber that covers part of a base member that holds the piezoelectric or magnetostrictive element. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 15, 16, 17, 18, 19, 20)
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14. A method for measuring propagation time of an ultrasonic wave in a system in which an ultrasonic wave transmitter including:
- a cylindrically-shaped piezoelectric or magnetostrictive element sending out an ultrasonic wave signal; and
an ultrasonic wave absorber that covers part of a base member holding the piezoelectric or magnetostrictive element is arranged facing an ultrasonic wave receiver adapted to receive ultrasonic wave signal, the method comprising;sending out an electromagnetic wave signal indicating transmitting timing; generating an ultrasonic wave driving signal by modulating an ultrasonic wave with a pseudorandom signal simultaneously with sending out of the electromagnetic wave signal; sending out an ultrasonic wave signal of a frequency higher than a fundamental frequency of the ultrasonic wave driving signal, under driving by the ultrasonic wave driving signal; detecting the electromagnetic wave signal; detecting the ultrasonic wave signal sent out; and calculating a value of correlation between the ultrasonic wave signal detected and a model waveform which is the same waveform as that of the ultrasonic wave driving signal; detecting a principal peak value of the value of correlation calculated; and calculating an ultrasonic wave propagation time from a time point of detection of the electromagnetic wave signal and a time point of detection of the principal peak value.
- a cylindrically-shaped piezoelectric or magnetostrictive element sending out an ultrasonic wave signal; and
Specification