Phonon frequency comb-based low-frequency signal detection system
A low-frequency signal and detection system technology, applied to measuring devices, measuring ultrasonic/sonic/infrasonic waves, instruments, etc.
Active Publication Date: 2021-06-08
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 present invention discloses a phonon frequency comb-based low-frequency signal detection system which comprises a sensitive mass block and a detection element, the mass block is connected with the detection element through an amplification beam, the mass block is used for sensing vibration and converting the vibration into tension or pressure to be applied to the amplification beam, and the amplification beam transmits and amplifies the force to the detection element. The rigidity of the detection element is dynamically changed, so that the response of the detection element is comb-shaped. The frequency spectrum analyzer is used for reading frequency spectrum information of the detection element, and the frequency and the amplitude of a vibration signal borne by the whole device are inverted by calculating the comb tooth distance of the frequency comb in the frequency spectrum of the output signal of the detection element and the ratio of the first-order comb tooth amplitude to the center comb tooth amplitude. According to the invention, the application requirements of high resolution and wide range can be met, the amplitude and frequency of the low-frequency vibration signal can be measured at the same time, and engineering practical application is facilitated.
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