基于光纤光栅的铁塔摆幅监测方法研究

Research on a fiber grating based tower sway amplitude monitoring method

针对大型短波架空天线幕铁塔的安全监测要求,提出了一种铁塔摆幅的监测方法。通过光纤光栅应变传感器测试铁塔三条斜拉索的应变,计算出铁塔塔顶的摆幅,当摆幅大于规定的安全值时报警。现场测试证明,该系统可以准确测试铁塔的摆幅,倾斜度误差约1/24 000,能够满足铁塔安全报警的要求,可以代替人工定期测试的方法。

This paper presents a monitoring method of tower sway amplitude for the security monitoring requirement of a large-scale short wave aerial antenna curtain tower. It employs a fiber grating strain sensor to determine the strain variation on the three stay cables of a tower and then calculates the sway amplitude at the top of the tower. An alarm will be generated when the sway amplitude is greater than the preset safe value. Field tests show that the method can accurately determine the sway amplitude of a tower with an approximate inclination error of 1/24000. It is therefore sufficient for the requirement of tower safety pre-alarm, so it can replace the regular manual test methods.