Vibration sensor based on magnetic suspension principle

A vibration sensor and magnetic levitation technology, applied in the direction of instruments, electromagnetic means, seismic signal receivers, etc., can solve the problems of narrow detection frequency band, large noise interference, insufficient detection of broadband elastic waves, etc., and achieve the effect of high sensitivity

Inactive Publication Date: 2007-06-27
谭成忠
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Problems solved by technology

Due to the natural frequency of the spring, the detection frequency band of the "moving coil velocity detector" is very narrow, which is not enough to detect all the broadband elastic waves generated by artificial explosions
Moreover, this type of traditional speed detector has a lot of noise interference. In order to suppress the noise, it is necessary to use several to dozens of series-parallel combinations

Method used

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  • Vibration sensor based on magnetic suspension principle
  • Vibration sensor based on magnetic suspension principle
  • Vibration sensor based on magnetic suspension principle

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Embodiment Construction

[0020] Based on the above magnetic levitation principle, we built more than 300 one-dimensional magnetic levitation vibration sensors, and measured the amplitude-frequency characteristics of the sensors. The results are shown in Figure 3. The constructed magnetic levitation vibration sensor was used in petroleum geophysical prospecting in a certain place in Jiangsu, and a single shot comparison experiment was carried out with a single magnetic levitation sensor and 24 traditional moving coil geophones imported from France. The results are shown in Figure 4, left The picture shows the result of a single magnetic levitation vibration sensor, and the picture on the right shows the combined result of 24 traditional moving coil detectors. It can be seen that the resolution of the magnetic levitation sensor used in petroleum geophysical exploration is higher than that of the combination of traditional moving coil detectors. Fig. 5 is a spectrum diagram of the reflected wave signal r...

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Abstract

The vibration sensor is composed of magnet and winding. Characters are that when sensor induces external vibration, relative motion between magnetic suspended magnet and magnet fixed inside sensor occurs. Vibration of suspended magnet causes change of flux through coil. Based on Faraday law of electromagnetic induction, coil generates induction electromotive force being direct proportion to vibration velocity. Features are: simple and compact structure without need of metal reed and spring for fixing suspended magnet, wider induced vibration frequency spectrum. The disclosed vibration sensor is new type passive speed type vibration sensor.

Description

field of invention [0001] The invention relates to a vibration sensor based on the principle of magnetic levitation. The present invention has special applications in geological exploration and vibration safety monitoring, such as oil exploration and seismic measurement, but can still be widely used in mechanical vibration, sound wave and ultrasonic measurement. Background of the invention [0002] Vibration is a research topic widely involved in engineering technology and scientific research, such as seismic exploration, mechanical vibration, and sound wave and ultrasonic measurement. Vibration measurements include physical quantities such as displacement, frequency, phase, and vibration velocity and acceleration. At present, traditional vibration measurement methods include mechanical, inductive, capacitive, piezoresistive, piezoelectric and other sensor devices. The limitations of these traditional sensor devices are low sensitivity, poor anti-electromagnetic interferen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H11/02G01V1/18
Inventor 谭成忠
Owner 谭成忠
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