Ultra-wideband extensometers, mounting method thereof and calibration device

A technology of ultra-wideband and calibration devices, which is applied in the direction of measuring devices, electrical devices, electromagnetic measuring devices, etc., can solve the problems that cannot meet the requirements of broadband observation, the accuracy and practicability cannot meet the requirements, and the influence of temperature changes is not considered. and other problems to achieve the effects of alleviating air pressure interference, compact and smart structure, and improving accuracy and sensitivity

Pending Publication Date: 2019-07-26
INST OF EARTHQUAKE CHINA EARTHQUAKE ADMINISTRATION +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Due to the lack of accuracy of the sensor itself of the traditional extensometer, in order to improve the signal-to-noise ratio, the baseline length of the instrument is generally 20 meters. Influence of force on the instrument in the direction of measurement
This not only affects the frequency response characteristics of the instrument, but also brings measurement errors of the instrument
[0006] The existing short-baseline extensometer can theoretically achieve broadband observation, but the filter circuit still uses 60s low-pass filtering, which cannot meet the broadband observation requirements
At the same time, its accuracy and practicability are not up to the requirements through actual observations. The main influencing factors include: (1) Due to the shortening of the baseline length, the influence of temperature on the measurement accuracy increases, and the entire design does not consider the influence of temperature changes; (2) ) does not take into account the influence of air pressure on the instrument, and the influence of air pressure is obvious in actual observations, etc.

Method used

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  • Ultra-wideband extensometers, mounting method thereof and calibration device
  • Ultra-wideband extensometers, mounting method thereof and calibration device
  • Ultra-wideband extensometers, mounting method thereof and calibration device

Examples

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Embodiment 1

[0032] Such as figure 1 As shown, an ultra-wideband extensometer includes an extensometer body 1, a calibration device 2 and a protective cover 3, and the extensometer body 1 includes a first fixed end 11, a baseline rod 12, a capacitive sensor 13 and a second fixed end 14, Described capacitive sensor 13 is fixed on the second fixed end 14, and capacitive sensor 13 comprises two capacitive sensor stators 132 and a capacitive sensor moving plate 131, and one end of baseline rod 12 is installed on the first fixed end 11, and baseline rod 12 is another One end is vertically connected to the capacitive sensor moving piece 131 , the protective cover 3 is arranged outside the extensometer body 1 ; the calibration device 2 is arranged inside the protective cover 3 and connected to the baseline rod 12 .

[0033] The ultra-wideband extensometer of the present invention includes an extensometer body, a calibration device and a protective cover, and the calibration device is arranged ins...

Embodiment 2

[0037] Compared with Embodiment 1, this embodiment shows a specific structure of a protective cover 3 , and the protective cover 3 may include a baseline protection unit 32 and a sealing cover 31 . Specifically, such as figure 1 As shown, an extensometer includes an extensometer body 1, a calibration device 2 and a protective cover 3. The protective cover 3 may include a baseline protection unit 32 that is overlaid on the baseline rod 4 and connected to both ends of the baseline protection unit 32. 1. A sealing cover 31 covering the first fixed end 11 and the second fixed end 14 respectively. The use of capacitive sensing must solve the sealing problem. At the same time, because the baseline of the instrument is shortened, the above multi-component integral sealing method can be used to seal the whole. While maintaining heat to a large extent, it also solves the problem that the instrument is susceptible to air pressure interference.

[0038] In some embodiments, the baseline...

Embodiment 3

[0055] Since the instrument is sensitive to temperature, in order to arrange the instrument in a place with a small temperature difference to meet its observation needs, this embodiment proposes an installation method for the extensometer, which can be applied to the ultra-wideband With extensometer. Specifically, combined with Figure 4 and Figure 5 As shown, the installation method of the extensometer includes:

[0056] S201: Excavating a foundation pit on the complete bedrock of the cave body.

[0057] S202: Pouring the foundation pier 101 at the bottom of the foundation pit, and pre-embedding the connecting plate 102 on the top of the foundation pier 101 .

[0058] S203: Connect the first fixed end 11 and the second fixed end 14 of the extensometer to the connecting plate 102 respectively.

[0059] S204: coating the waterproof coating 103 on the inner wall of the foundation pit.

[0060] S205: Paste a sealing gasket on the step in the middle of the foundation pit and...

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Abstract

The invention provides ultra-wideband extensometers. An ultra-wideband extensometer comprises an extensometer body, a calibration device and a protection cover. The extensometer body comprises a firstfixing end, a baseline rod, a capacitive sensor and a second fixing end. The capacitive sensor is fixed at the second fixing end. The capacitive sensor comprises two capacitive sensor stator plates and a capacitive sensor rotor plate. One end of the baseline rod is mounted on the first fixing end. The other end of the baseline rod is connected with the capacitive sensor rotor plate. The protection cover is set at outside of the extensometer body. The calibration device is set in the protection cover and is connected with the baseline rod. According to the ultra-wideband extensometer, throughdesign of the fully-sealed protection cover, the problem of influence of a temperature and an air pressure on precision of the extensometer is solved. The invention also provides a mounting method applied to the ultra-wideband extensometer and the calibration device.

Description

technical field [0001] The invention relates to the field of earth science observation, in particular to an ultra-wideband extensometer and an installation method thereof, and also relates to a calibration device. Background technique [0002] The extensometer is an instrument for precisely measuring the relative change of the horizontal distance between two points in the crustal rock mass. It is suitable for observing the continuous change of the crustal strain and the horizontal component of the solid tide. Research provides important data. [0003] In recent years, many studies have found that in the daily monitoring of seismic and solid tide stations, abnormal "pulsation" signals are often superimposed on the solid tide curve in the observation data of tiltmeters and gravimeters. The envelopes of multiple main frequency domain signals are mostly "spindle-shaped" with different durations, and they have a good corroborating relationship with broadband seismometers in this...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B7/02G01B7/16
CPCG01B7/02G01B7/22
Inventor 杨江余剑锋陈志高关伟智李农发金鑫李震耿丽霞张行李静渊
Owner INST OF EARTHQUAKE CHINA EARTHQUAKE ADMINISTRATION
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