A circuit for enhancing the low-frequency measurement capability of a geo-sound sensor
A measurement capability and sensor technology, applied in measurement devices, measurement of ultrasonic/sonic/infrasonic waves, instruments, etc., can solve the problems of low-frequency measurement performance degradation, restricting the performance of vibration isolation systems, insufficient bandwidth expansion, etc., to prevent saturation instability, Good environmental adaptability and application object adaptability, the effect of eliminating common mode interference
Active Publication Date: 2019-11-12
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology
The geoacoustic sensor based on the principle of electromagnetic induction is the key device for the realization of active vibration isolation. It can provide the residual vibration signal of the vibration-isolated object for feedback control. By introducing the ceiling damping technology, the vibration amplification at the natural frequency can be effectively suppressed. The second-order high-pass characteristic, its low-frequency measurement performance is significantly degraded, which greatly limits the starting frequency of active vibration isolation, and limits the application of active vibration isolation
[0004] In practical applications, people often use bandwidth extension technology to improve the low-frequency measurement capability of geophone sensors by compensating the low-frequency dynamic characteristics of geophone sensors through circuits, but usually this analog bandwidth extension technology is only selected based on the noise characteristics of analog circuit systems. The frequency point of the sensor system, the damping ratio of the sensor system is usually selected around 0.7 to obtain a balance between the overshoot and response characteristics of the sensor system, which makes the sensor sensitivity also fixed
Since the feedback performance in active vibration isolation control is limited by the dynamic characteristics of the sensor, and the feedforward performance is limited by the sensor noise, the analog bandwidth expansion circuit with fixed frequency points and fixed damping ratio parameters cannot adapt to changes in the environment and load vibration levels, resulting in excessive or insufficient bandwidth extension, restricting the performance of the vibration isolation system
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[0030]In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.
[0031] see figure 1 , the circuit 106 that enhances the low-frequency measurement capability of the ground noise sensor provided by the present invention, the bandwidth expansion frequency point and damping ratio of the circuit 106 can be adjusted, and the adjustment of the damping ratio of the ground noise sensor is realized by adjusting the adjustable rail resistance R . When the ground sound...
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The invention belongs to the technical field of initiative vibration reduction and discloses a circuit capable of enhancing the low-frequency measurement capability of a rock noise sensor. The circuitincludes a signal amplification and damping adjustment circuit connected to the rock noise sensor, a high-pass filter circuit, a low-frequency enhancement and compensating circuit and an anti-aliasing filter circuit. The input end of the signal amplification and damping adjustment circuit is connected to the differential signal output end of the rock noise sensor; the input and output ends of thehigh-pass filter circuit are connected to the output end of the signal amplification and damping adjustment circuit and the input end of the low-frequency enhancement and compensating circuit respectively; the input end of the anti-aliasing filter circuit is connected to the output end of the low-frequency enhancement and compensating circuit; the output end of the anti-aliasing filter circuit isthe output end of the circuit capable of enhancing the low-frequency measurement capability of the rock noise sensor. The sensitivity of the sensor is adjustable, bandwidth extension frequency pointsand damping ratios are adjustable, great environmental adaptability and application object adaptability are achieved, and the stability is high.
Description
technical field [0001] The invention belongs to the technical field related to active vibration reduction, and more specifically relates to a circuit for enhancing the low-frequency measurement capability of a ground sound sensor. Background technique [0002] High-performance vibration isolation technology is a basic technology for ultra-precision machining, manufacturing and measurement equipment, and electron microscopic imaging. It provides an ultra-quiet environment for the equipment and is the basic guarantee for the service performance of the equipment. As the precision of equipment evolves towards nanometers and sub-nanometers, key units of equipment are more sensitive to microvibrations. The equipment structure is required to be ultra-stable, and the strictness of the micro-vibration suppression frequency range and vibration isolation performance is increasing geometrically. The vibration reduction system is facing new challenges of near-zero low-frequency, wide-fr...
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IPC IPC(8): G01H11/06
CPCG01H11/06
Inventor罗欣丁基恒陈学东李小清刘军军姜伟曾理湛
OwnerHUAZHONG UNIV OF SCI & TECH