Measuring and testing – Vibration – By mechanical waves
Patent
1997-09-08
1999-08-24
Williams, Hezron
Measuring and testing
Vibration
By mechanical waves
73600, 73602, 73627, G01N 2900
Patent
active
059426888
ABSTRACT:
A detecting device for detecting a physical quantity of an object, which includes a transmission signals generating device for generating first and second transmission signals of different frequencies, an ultrasonic wave transmission device that is excited by the first and the second transmission signal, for transmitting ultrasonic pulses corresponding to the first and the second transmission signal to an object, and a signal processing device for carrying out a signal processing process on the first and the second echo. The signal processing process is such that it detects phases of the first and second echo corresponding to the first and second transmission signal, which are received by the ultrasonic wave receiving device. An indeterminacy integer times as large as 2.pi. of the phase of each of the first and second echo is determined on the basis of the information of the amplitudes of the first or the second echo, and a distance from the ultrasonic wave transmission device through an object to the ultrasonic wave receiving device along an ultrasonic wave propagating path is detected on the basis of the determined phase of the first or second echo.
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Kimura Tomonori
Koike Mitsuhiro
Misu Koichiro
Nagatsuka Tsutomu
Wadaka Shusou
Kwok Helen C.
Mitsubishi Denki & Kabushiki Kaisha
Williams Hezron
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