A low frequency signal detection system based on phonon frequency comb
A low-frequency signal and detection system technology, applied in the direction of measuring devices, measuring ultrasonic/sonic/infrasonic waves, instruments, etc., to achieve the effects of high flexibility, convenient engineering practical application, and easy modulation
Active Publication Date: 2022-02-11
XI AN JIAOTONG UNIV
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If DC blocking measures are added to the circuit, the frequency lower limit is actually set for the accelerometer.
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[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0033]In describing the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", " The orientation or positional relationship indicated by "vertical", "horizontal", "top", "bottom", "inner", "outer", "side", "end", "side" etc. is based on the Orientation or positional relationship is only for the convenience of describing the present invention and simplify...
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The invention discloses a low-frequency signal detection system based on a phonon frequency comb, which includes a sensitive mass block and a detection element, the mass block is connected to the detection element through an amplifying beam, and the mass block is used to sense vibration and convert it into tension or pressure applied to the amplifying On the beam, the amplifying beam transmits and amplifies the force to the detection element, dynamically changes the stiffness of the detection element, and makes the response of the detection element show a comb shape. Use the spectrum analyzer to read the spectrum information of the detection element, and calculate the comb spacing of the frequency comb in the output signal spectrum of the detection element and the ratio of the first-order comb amplitude to the central comb amplitude to invert the vibration signal of the entire device frequency and amplitude. The invention can meet the application requirements of high resolution and large range, and can simultaneously measure the amplitude and frequency of low-frequency vibration signals, which is convenient for engineering practical application.
Description
technical field [0001] The invention belongs to the technical field of micromechanical systems and nonlinear dynamics, and in particular relates to a low-frequency signal detection system based on a phonon frequency comb. Background technique [0002] Low-frequency weak vibration means that the vibration frequency is less than 10Hz, and the acceleration is about 1-5m / s 2 . Because the acceleration of the vibration process is not large, the impact on people is small, and it is often ignored by people. However, low-frequency vibration is a common physical phenomenon that cannot be ignored, such as the vibration of large engineering structures and large rotating machines. These vibrations do not have much impact on people's daily life under normal conditions. The allowable limit will cause great harm to social production and life. Therefore, in the field of engineering technology, the test and research of low-frequency vibration have always been highly valued. Vibration sens...
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IPC IPC(8): G01H11/06
CPCG01H11/06
Inventor 韦学勇阳琪琪王雪峰徐柳徐宇涛宦荣华
Owner XI AN JIAOTONG UNIV