Sensor sensitivity improving method and system based on nonlinear domain modal coupling

Abstract

The invention discloses a sensor sensitivity improving method and system based on nonlinear domain modal coupling, and the method employs the coupling characteristic between at least two vibration modes in a resonator, employs a first mode in the two modes as a frequency output mode, and employs a second mode as a cavity mode to sense an external variable to be measured. In order to excite a coupling characteristic between the first mode and the second mode, the method entails the application of at least one pump. Meanwhile, in order to improve the sensitivity of the sensor, according to the method, the vibration state of the first mode needs to be excited to a nonlinear vibration area, the high-branch frequency of the second mode serves as final output, phase closed-loop control can be conducted on the first mode through a phase-locked loop, and rapid collection and measurement of the frequency are achieved. The invention is applied to a frequency output type sensor, can improve the sensitivity of the frequency output type sensor, does not need to introduce other auxiliary devices, and has the advantages of easy operation, convenient integration, stability, reliability, wide application range and the like.

Description

technical field [0001] The invention relates to the technical field of frequency output sensors, in particular to a sensor sensitivity improvement method and system based on nonlinear domain modal coupling. Background technique [0002] Frequency output sensors are indispensable sensor devices in modern life, and are widely used in the characterization and measurement of physical quantities such as temperature, pressure, acceleration, and angular velocity. Because of its stable performance, simple structure, high reliability, large carrying capacity, small size, light weight and low cost, it has also become the core device of many military weapons and equipment, and is currently a hot research field at home and abroad. [0003] Traditional frequency output sensors usually keep the resonator in a stable vibration state. When the external physical quantity to be measured changes, the resonant frequency of the resonator changes. By measuring the resonant frequency, the physical...

AI Technical Summary

Problems solved by technology

However, traditional frequency output sensor sensitivity enhancement methods are often limited to a single vibration mode of the resonator

However, high-precision frequency output sensors are becoming more and more popular in the market, and the traditional method of improving sensor sensitivity can no longer meet the demand.

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