Cable force detecting method and cable force sensor using same

Abstract

The invention discloses a cable force detecting method and a cable force sensor using the same. A linear relationship between induction voltage and steel cable force is decided, the induction voltage is generated by a magnetic-electric sensing unit in the cable force sensor along with the change of the magnetic field, and the magnetic-electric sensing unit with magnetostriction performance is utilized to replace a detecting coil of a magnetic flux senor as a detecting unit to detect the induction voltage of the cable force sensor in axial deformation of a steel cable. The cable force detecting method has the advantages of reducing magnetic flux leakage of the detecting unit and magnetic flux leakage between the detecting unit and an excitation coil and improving the measurement accuracy of the sensor. In addition, the magnetic-electric sensing unit with the magnetostriction performance can directly respond the induction voltage through change of the internal magnetic field of a coil framework, and a method of responding the induction voltage through the change of the magnetic flux and then transmitting the induction voltage through the detecting unit to obtain response voltage is avoided. Thus, the response time is short, and the testing speed is high. Furthermore, the cable force sensor is simple in manufacturing procedure, and the signal to noise ratio of the sensor is improved.

Description

technical field [0001] The invention relates to a steel cable force detection technology, in particular to a cable force detection method and a cable force sensor using the method. Background technique [0002] The steel cable is a kind of flexible load-bearing component, and its cable force state is an important symbol to measure whether the building is in normal operation state. Real-time monitoring of the cable force of the steel cable is of great engineering significance for building health monitoring. The magnetoelastic effect method is currently the most potential method for monitoring the cable force. This method uses the magnetic flux sensor to measure the change of the magnetic flux in the steel cable, so as to obtain the cable force of the steel cable. The specific process is as follows: figure 1 As shown in the magnetic flux sensor, the magnetic flux sensor includes a coil bobbin, a detection coil wound on the outer surface of the coil bobbin, an excitation coil w...

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Problems solved by technology

However, the existing magnetoelastic effect method has the following problems: 1. The magnetic flux sensor generates an induced electromotive force through the change of the magnetic flux inside the detection coil induction coil skeleton. interference, resulting in low measurement accuracy of the sensor; 2. During the measurement process, the steel cable must first be magnetized by the excitation coil, and then the change of the magnetic flux of the magnetic field when the steel cable is deformed is induced by the detection coil, and then the cable force is calculated and measured. It takes a certain response time to magnetize the steel cable, and it also takes a certain time for the detection coil to obtain the magnetic field information of the measured characteristic signal, which leads to a slow response speed of the sensor and a slow test speed; The possible large and evenly distributed magnetic flux requires strict size matching between the detection coil and the coil bobbin and between the detection coil and the excitation coil, which leads to a relatively complicated sensor processing technology and a signal-to-noise ratio of the sensor during the measurement process. Low

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