Wireless vibrating wire acquisition system and method for synchronous sampling

Abstract

The invention provides a wireless vibrating wire acquisition system and method for synchronous sampling. The system comprises a main control end (1), a vibrating wire sensor acquisition end (2) and a vibrating wire sensor (3). The main control end (1) performs networking and data interaction with all acquisition nodes in the vibrating wire sensor acquisition end (2) in a wireless mode; each acquisition node in the vibrating wire sensor acquisition end (2) receives and responds to all operating commands sent by the main control end (1); and the vibrating wire sensor (3) senses micro deformation of a part to be detected such as a bridge, a slope and the like, converts the micro deformation into electrical signals and transmits the electrical signals to the vibrating wire sensor acquisition end (2) for acquiring. The method comprises: step 1, initializing the system; step 2, sending a networking connection command; step 3, starting synchronous sampling; step 4, acquiring data of each acquisition node; and step 5, storing and uploading the data. By adopting the wireless mode, the synchronous sampling function of each node is realized, the detection efficiency is greatly improved, and the accuracy and the reliability of data are ensured.

Description

technical field [0001] The invention relates to a vibrating wire acquisition system and method, and belongs to the technical field of geotechnical engineering detection and monitoring. Background technique [0002] In the safety monitoring of geotechnical engineering, road traffic facilities, large buildings, etc., safety monitoring instruments such as vibrating wire sensors are usually used to monitor physical quantities such as stress and strain, temperature, joint opening, leakage and deformation for analysis and judgment security situation. The vibration natural frequency parameter of the steel string inside the vibrating wire sensor is the most critical measurement factor. At present, the frequency parameter of the steel string is usually measured by exciting the method of vibration pickup: the acquisition terminal first sends a single pulse excitation signal to the vibrating wire sensor or Sweep the excitation signal, feed the excitation energy to the vibrating wire s...

AI Technical Summary

Problems solved by technology

It can be seen that this method still needs 3-5 times to read the frequency value of the sensor, which is not conducive to the improvement of detection efficiency. In addition, the system uses FPGA to control the excitation circuit to generate excitation pulses and sample the output frequency value of the vibration pickup circuit to transmit to Processor, the system is complex, the cost is high, and it is not easy to integrate and promote

The most important point is that the acquisition system and the sensor are connected by wired cables. This method has two disadvantages. First, the wiring is laborious and laborious, especially for the monitoring of slopes and tunnels with harsh environments.

In addition, the wired connection method cannot well solve the problem of large attenuation of the small induction electrical signal in the long-distance transmission cable after the vibration of the vibrating wire sensor, which brings great difficulties to the design and processing of the subsequent vibration pickup circuit. And it will greatly affect the frequency measurement accuracy

[0006] Chinese invention patent application CN101832752A discloses a low-power vibrating wire strain collection system using wireless sensor network technology. The system includes a computer 1, a wireless control base station 2 and a wireless strain sensor network 10, and adopts a wireless communication method, but the system The patent does not involve the problem of synchronous data collection of each wireless node

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