Method and device for measuring propagation time of signal, in particular ultrasonic signal
A technology of propagation time and signal propagation, applied in measuring devices, measuring ultrasonic/sonic/infrasonic waves, measuring propagation speed, etc., can solve difficult problems
Inactive Publication Date: 2002-03-27
SCHLUMBERGER IND INC
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This method is difficult to implement and requires multiple measurements to be generated and stored, as well as multiple calculations
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[0031] image 3 shows the excitation signal I used to excite the transmitter transducer en , and shows the received signal SRn measured at the receiver transducer output. The propagation time T to be measured P is the time between the moment the excitation signal is delivered to the transducer and the moment the resulting ultrasonic wave reaches the receiver transducer.
[0032] The excitation signal IEn comprises a series of n pulses, eg with a duty cycle of 0.5. The number of pulses n constituting the excitation signal is n≠1. The frequency spectrum of each pulse includes at least an excitation frequency T close to the resonance frequency of the transducer e , for example 1MHz. Thus, since the transducer is compatible with the oscillator, when it is subjected to a series of pulses, each roughly in the form of a square wave, it will become in a state of continuous periodic oscillation for a period associated with the number of pulses making up the excitation signal. a p...
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The invention concerns a method for measuring the propagation time Tp of a signal, in particular an ultrasonic signal between two transducers consisting of a transmitter and a receiver at some distance from each other. The transmitting transducer is subjected to an excitation signal comprising n successive pulses of period Te resulting in the transmission of an ultrasonic wave in the direction of the receiving transducer. The ultrasonic wave generates a reception signal in output of the receiving transducer. An intermediate propagation time Tint is started as from the start of the excitation of the transmitting transducer. The reception signal in output of the receiving transducer is detected and the oscillations of said reception signal are counted. The measurement of the intermediate propagation time Tint is stopped when the i-i oscillation is detected. The propagation time Tp of the signal is determined by forming the difference Tint - i x Te. Advantageously, the measurement of the intermediate propagation time Tint is stopped for the i-i oscillation of the reception signal corresponding to a maximum amplitude of the reception signal.
Description
technical field [0001] The invention relates to a method and a device for measuring the propagation time of signals, in particular ultrasonic signals, between two transducers. Background technique [0002] Measures the time T that a signal, such as an ultrasonic signal, travels between two transducers P The known method of ® consists of exciting the transmitter transducer with an excitation pulse IE1, which is roughly in the form of a square wave and whose spectrum includes the excitation frequency of the transducer. When emitted by the transmitter transducers, this pulse generates ultrasonic waves in the medium between the two transducers. This wave will propagate towards the receiver transducer. figure 1 The excitation signal IE1 of the transmitter transducer and the signal SR1 as output of the receiver transducer are shown. The method includes detecting a first oscillation of the wave when the wave reaches a receiver transducer. Then, the propa...
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IPC IPC(8): G01F1/66G01H5/00
CPCG01H5/00G01F1/667
Inventor 克里斯托夫·利勒
Owner SCHLUMBERGER IND INC