Compound intelligent vibration sensor and vibration source test and location method

Abstract

The invention relates to a compound intelligent vibration sensor and a vibration source test and location method. The sensor consists of a spherical structure and an intelligent control system. The spherical structure comprises a spherical shell, encapsulating material, an external interface, a power and signal conditioning circuit board and the like; the intelligent control system comprises a three-axis magnetoresistive sensor for testing attitude, a three-axis acceleration sensor for testing attitude, a low-range three-axis acceleration sensor for testing vibration, a high-range three-axis acceleration sensor for testing vibration, a microcontroller, a serial communication unit, a conditioning amplifier, an anti-alias filter, a voltage follower, a charge amplifier, a power module and the like; and the vibration source test and location method can realize high-precision underground vibration source location. The sensor and the vibration source test and location method can be used for coal seam goaf monitoring, tunnel hole detection and the location of impact points in ranges and other various vibration sources as well as the research of the related theory of stress waves in a vibration test field.

Description

technical field [0001] The invention belongs to the field of distributed blasting vibration testing technology, passive positioning technology and sensor technology, and specifically relates to a composite intelligent vibration sensor and a seismic source testing and positioning method. Background technique [0002] The underground seismic source positioning technology based on the wireless sensor network is a wireless network composed of a large number of sensor nodes with different buried depths in the near-field monitoring area of ​​the underground seismic source. Transmit the vibration signal generated by the seismic source (such as the shock wave signal propagating in the near area of ​​blasting, the shock wave in the middle area is gradually converted into a stress wave signal, its propagation speed is similar to the speed of sound wave, and the seismic wave signal in the far area is similar to elastic vibration), and through analysis The characteristics of the vibrati...

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Problems solved by technology

[0008] 2. During the underground installation of the sensor, in order not to damage the nature of the measured site to the greatest extent, it is necessary to install the sensor to a predetermined position through a deep hole. Due to a certain depth from the ground, it is impossible to artificially fix the three axes of the vibration sensor to the preset direction In fact, in the test field, each vibration sensor node has its own three-axis vibration coordinate system, and it is difficult to correct it to an artificially set unified coordinate system, so that the vibration information of the arrival of the wave cannot be converted into an effective The arrival angle information of waves cannot realize the DOA positioning algorithm, and at the same time, it cannot effectively study the propagation characteristics of stress waves (including shear waves, longitudinal waves and other waveform components) in the test field

[0009] 3. In the process of locating underground seismic sources, in order to improve the acquisition accuracy of vibration signals, it is necessary to install sensors with different ranges in the test areas of different ranges in the vibration test field. However, due to the deviation between the actual vibration intensity and theoretical calculation, the actual vibration sensor During the test after selection, the vibration sensor at a certain node has no signal, or the signal is full.

[0010] 4. When TDOA is used for positioning, the sensor is required to have extremely high frequency response and high overload. It is not required that the sensor can obtain the vector information of the vibration, but only the peak-time information corresponding to the peak value of the vibration intensity (that is, scalar information) Therefore, this kind of high-response sensor is mainly single-axis, and it is enough to point the sensitive axis to the detection direction, but in the underground installation process, it is impossible to reliably point the sensitive axis to the vibration direction, so the most accurate time information cannot be obtained

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