Method and system for wirelessly measuring resonant frequency of sample piece by combination of sound waves and electromagnetic waves
A technology for resonant frequency and wireless measurement, which is applied in the direction of measuring resonant frequency, measuring ultrasonic/sonic/infrasonic waves, measuring devices, etc. It can solve the problems of damage to the tested sample and the difficulty in implementing the self-spectrum analysis method, so as to achieve convenient and simple implementation. Effect
Inactive Publication Date: 2011-08-03
ZHEJIANG UNIV
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Problems solved by technology
The simple harmonic force excitation method and the hammering method have the risk of damaging the tested sample; while the self-spectrum analysis method is difficult to implement and is only suitable for the tested sample with a specific structure
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[0016] The present invention will be further described below in conjunction with drawings and embodiments.
[0017] Such as figure 1 As shown, including electromagnetic wave source, transmitting antenna, receiving antenna, spectrum analyzer, sound wave source and electroacoustic transducer; The electromagnetic wave reflected by the sample to be tested is received by the receiving antenna and then received by the spectrum analyzer; the sound wave source is connected to the electro-acoustic transducer, which is converted into a high-power, high-directivity, frequency-adjustable single-frequency sound beam for irradiation The sample to be tested causes the sample to be tested to generate mechanical vibration.
[0018] The sample to be tested is any system or device.
[0019] A) The single-frequency carrier signal generated by the electromagnetic wave source is converted into electromagnetic waves by the transmitting antenna, and irradiates the sample to be tested;
[0020] B) ...
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The invention discloses a method and a system for wirelessly measuring the resonant frequency of a sample piece by the combination of sound waves and electromagnetic waves. A single frequency carrier signal generated by an electromagnetic source is converted into electromagnetic waves by an emitting antenna to irradiate the sample piece to be tested; and the electromagnetic waves reflected by the sample piece to be tested are first received by a receiving antenna and then received by a frequency spectrograph. An acoustic frequency signal generated by an acoustic wave source is converted into a high-power and high-directionality acoustic wave beam by an electroacoustic transducer to irradiate the sample piece to be tested, so that the sample piece to be tested generates mechanical vibration. When the frequency of the acoustic waves is equal to the vibration frequency of the sample pipe to be tested, the mechanical vibration amplitude of the sample piece to be tested reaches the highest value. The mechanical vibration of the sample piece to be tested performs amplitude modulation on the electromagnetic waves, so that sidelobes occur on two sides of the carrier in a frequency spectrogram. The sidelobes on two sides of the carrier are observed by the frequency spectrograph, and the acoustic wave frequency corresponding to the maximum amplitude of the sidelobes is the resonant frequency of the sample piece to be tested. In the invention, the resonant frequencies of various samples to be tested can be measured accurately without damaging and contacting the tested sample pieces.
Description
technical field [0001] The invention relates to a sound wave and electromagnetic wave cooperative working method and system, in particular to a sound wave and electromagnetic wave cooperative wireless measurement method and system for resonant frequency of a sample. Background technique [0002] The resonant frequency, also known as the natural frequency, refers to the frequency due to the material and structural size of the physical system itself. For a physical system, when the frequency of the external driving force is the same as its resonance frequency, the forced vibration amplitude of the system is the largest. In general a system (whether mechanical, acoustic or electronic) has multiple resonant frequencies where it is easier to vibrate and other frequencies are more difficult to vibrate. [0003] The traditional resonant frequency measurement methods include simple harmonic force excitation method, hammering method and self-spectrum analysis method, etc. The simpl...
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IPC IPC(8): G01H13/00
Inventor 郑晓程王静雨张斌皇甫江涛冉立新
Owner ZHEJIANG UNIV