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Acceleration sensor, sensing method, displacement monitoring system and monitoring method

An acceleration sensor and acceleration technology, which is applied in the direction of acceleration measurement, instruments, and measuring devices using inertial force, can solve the problems of small output voltage of the acceleration sensor, unfavorable useful signal detection, signal multi-harmonic components, etc., and achieve signal robustness , high sensitivity, wide application prospects

Pending Publication Date: 2018-11-13
BEIJING INST OF NANOENERGY & NANOSYST
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  • Summary
  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

However, the output voltage of the acceleration sensor based on the piezoelectric effect is small, especially in low-frequency or even ultra-low-frequency application scenarios, it is easy to be lost in the background noise of the environment or the circuit, and the output signal has more harmonic components , which is not conducive to the detection of useful signals

Method used

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  • Acceleration sensor, sensing method, displacement monitoring system and monitoring method
  • Acceleration sensor, sensing method, displacement monitoring system and monitoring method
  • Acceleration sensor, sensing method, displacement monitoring system and monitoring method

Examples

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Embodiment 1

[0049] The acceleration sensor provided by the invention can be applied to the vibration monitoring of infrastructures such as bridges, and its structure can be found in figure 1 , including: a vibration signal acquisition module 1, which is used to convert the acceleration of the object to be monitored, such as vibration, into a voltage signal output; an analog-to-digital conversion module 2, which is used to convert the voltage signal output by the vibration signal acquisition module 1 into a digital signal through analog-to-digital conversion Voltage signal; a linear transformation module 3, configured to linearly transform the digital voltage signal into a digital acceleration signal.

[0050] In the present invention, the triboelectric nanogenerator includes a static part, a moving part and an elastic connecting part. When external vibrations are applied to the triboelectric nanogenerator, the static part remains relatively static with the external target to be monitored....

Embodiment 2

[0063] Corresponding to embodiment one, the present invention also provides a kind of acceleration sensing method, bridge, building are waited for the vibration of monitoring target to monitor, comprise steps:

[0064] S1, the vibration signal acquisition module converts the acceleration of the vibration of the target to be monitored into a voltage signal output.

[0065] In this step, the vibration signal acquisition module can use an existing frictional nanogenerator, such as the structure of the frictional nanogenerator in Figure 2, to collect vibration acceleration signals.

[0066] S2, the analog-to-digital conversion module converts the voltage signal output by the vibration signal acquisition module into a digital voltage signal through analog-to-digital conversion.

[0067] The voltage signal output by the friction nanogenerator is an analog signal, which is converted into a digital voltage signal by an analog-to-digital conversion module. The sampling frequency can be...

Embodiment 3

[0071] This embodiment provides a vibration displacement monitoring system for targets to be monitored such as bridges, etc., see Figure 7 Including: the acceleration sensor in the first embodiment, which collects the acceleration of the vibration of the target to be monitored;

[0072] The integration module 4 is used to perform double numerical integration on the digital acceleration signal to obtain the estimated result S of the vibration displacement of the target to be monitored; the state judgment module 6 compares the displacement estimated result S with a preset threshold V, and determines that the vibration displacement of the target to be monitored is compared. Monitor target status.

[0073] See Figure 7 , may also include a high-pass filter module 5 for eliminating the baseline drift of the voltage signal and the baseline drift caused by the double numerical integration.

[0074] The status of the target to be monitored can include danger, warning and safety. ...

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Abstract

The invention discloses an acceleration sensor, a sensing method, a displacement monitoring system and a displacement monitoring method. The acceleration sensor comprises a vibration signal acquisition module which is used for converting the acceleration of the vibration of a target to be monitored into a voltage signal and outputting the voltage signal, an analog digital conversion module which is used for converting the voltage signal outputted by the vibration signal acquisition module into a digital voltage signal by analog-to-digital conversion, and a linear conversion module is used forlinearly converting the digital voltage signal into a digital acceleration signal. According to the vibration acceleration sensor and the vibration displacement monitoring system provided by the invention, a friction nano-generator is utilized to convert mechanical energy into an electrical signal, and the real-time monitoring of vibration acceleration and displacement is realized. The vibration acceleration sensor and the vibration displacement monitoring system have the advantages of low cost, signal robustness, high sensitivity, wide covering range and the like, and can be widely applied toin the Internet of Things and smart cities.

Description

technical field [0001] The invention relates to the field of displacement monitoring, in particular to a self-powered acceleration sensor and a sensing method, a displacement monitoring system and a monitoring method. Background technique [0002] With the rapid development of urbanization, more and more urban infrastructure such as high-rise buildings and overpasses have been deployed. While bringing convenience to daily life, how to realize real-time monitoring of It is of great economic and social significance to give early warning of the dangers. [0003] Existing solutions generally utilize vibration displacement to monitor the health of the facility. The traditional direct measurement method directly measures displacement by deploying specific devices, such as Linear Variable Differential Transducer (LVDT) or portable Laser Doppler Vibrometer (LDV). Although this type of direct measurement method has high accuracy, it often needs to set up expensive measurement equip...

Claims

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Application Information

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IPC IPC(8): G01P15/08G01B21/02
CPCG01B21/02G01P15/08
Inventor 王中林余华何旭丁文伯
Owner BEIJING INST OF NANOENERGY & NANOSYST
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