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Method and device for detecting ultrasonic time of flight

A time-of-flight, ultrasonic technology, used in measuring devices, measuring ultrasonic/sonic/infrasonic waves, measuring reverberation time, etc., to achieve high-precision results

Inactive Publication Date: 2010-07-07
FARMLAND IRRIGATION RES INST CHINESE ACAD OF AGRI SCI
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Problems solved by technology

[0018] The above ultrasonic transit time detection method is the most accurate phase difference method, but it is only suitable for a few occasions where the ultrasonic (mechanical energy wave) transmission distance is very short, and it is not suitable for most occasions where the ultrasonic (mechanical energy wave) transmission distance is relatively long, such as measuring furnace temperature

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  • Method and device for detecting ultrasonic time of flight
  • Method and device for detecting ultrasonic time of flight
  • Method and device for detecting ultrasonic time of flight

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Embodiment Construction

[0033] A method of detecting the transit time of ultrasonic waves, such as figure 2 As shown, the ultrasonic generator 6 generates a square-wave ultrasonic pulse train excitation signal with a duty ratio of 50%. figure 1 The shown "rhombus" is the upper limit, because the falling edge of the last square pulse of the ultrasonic pulse train excitation signal corresponds exactly to the number of pulses received to form the "rhombus" ultrasonic pulse train received and the ultrasonic pulse train excitation The last square pulse of the signal excites the peak point of the pulse with the largest amplitude in the same direction, and will not drift, so a timer is started on the falling edge of the last square pulse of the ultrasonic pulse train excitation signal, and the ultrasonic pulse train excites After the signal is amplified by the power of the high-voltage differential drive module 7 of the ultrasonic transmitter, the ultrasonic transmitter 8 is driven to emit ultrasonic waves...

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Abstract

The invention relates to a method and a device for detecting ultrasonic time of flight. The method is characterized in that an ultrasonic generator generates square wave ultrasonic pulse train excitation signals with 50 percent of duty cycle, the upper limit of the number of square pulses contained by the excitation signals is set when the wave shape of the received ultrasonic pulse train is still in a diamond shape; a timer is started up at the falling edge of the last square pulse of the excitation signal, received ultrasonic pulse train finds the peak point of maximum pulse of amplitude through differential amplification, gain control, high Q value band-pass filter, half wave rectification, variable index amplification, threshold comparison, differential and zero-crossing detection, and the timer is turned off at the peak point. The method not only achieves the high precision of phase difference method, but also overcomes the defects that the phase difference method can only be applied at short distances, breaks the tradition, and has broad application.

Description

Technical field: [0001] The invention belongs to the field of ultrasonic application technology, and relates to a method and a device for detecting ultrasonic transit time of relatively long-distance ultrasonic transit time with high precision. Background technique: [0002] The so-called ultrasonic time-of-flight (TOF for short) refers to the time interval that the ultrasonic wave is sent from the transmitter to the ultrasonic receiver receives the sound wave. Ultrasonic transmitters or ultrasonic transmitters and ultrasonic receivers or ultrasonic receivers are collectively referred to as ultrasonic transducers. Accurate measurement of ultrasonic transit time is of great significance to ultrasonic temperature measurement, distance measurement, flow rate measurement and so on. Due to the rapid expansion of the application field of the unique advantages of ultrasonic waves, ultrasonic temperature measurement has suddenly emerged. The following uses ultrasonic measurement of...

Claims

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Application Information

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IPC IPC(8): G01H7/00
Inventor 高胜国黄修桥高任翔李发贵
Owner FARMLAND IRRIGATION RES INST CHINESE ACAD OF AGRI SCI
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