| For the problems of the long distance distribution measurement and the strong temperature output in practical engineering, this paper designed and manufactured the digital fatigue sensor, integrating the resistance measuring meter. In order to overcome these problems, it had temperature compensation, nonlinear calibration and communication by RS485. The sensor could prolong transmission distance to 1200m. The sensor was proved by experiments that the resolution of the system reaches 0.001% of the resistance change rate; and the temperature time drift less than 0.05%. So it completely meets the requirements of fatigue monitoring. In order to evaluation the sensor functions, application software was developed. This software could control the sensors accomplish muti functions and construct simulation network, the data would be display on computer by chart, so users could analyze the data easily.Also, this paper, according to the problems of small load, special clamping and so on in fatigue sensor calibration, introduced a fatigue sensor calibration experiment device. Static load test could be directly conducted on this device; this device simplified the calibration procedure. Application software was developed on computer, the software automatically accomplished calibration tasks, showed the data by chart on computer and save the data in documental format. This device simplified user operations and gave accuracy data. |
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