玻璃钢抽油杆微波检测信号源最佳频率实验

Experiment on optimum frequency of microwave signal source for detecting fiberglass reinforced plastic sucker rod.

利用 8mm微波信号源 ,对玻璃钢抽油杆进行无损检测 ,信号源最佳频率点的确定是关键性技术。由于有些材料对某个频率或极窄频带的微波特别敏感 ,信号源的最佳频率一般理论计算难以确定。为此 ,通过实验的方法寻找适合于玻璃钢抽油杆微波无损检测的信号源最佳频率点 ,以获得最佳的缺陷反射信号波和穿透接收信号波。通过大量的实验研究 ,得出结论 :在检测系统其它参数不变的情况下 ,信号源频率的改变对于反映缺陷信号的灵敏度有很大的影响 ;采用36 75GHz频率的微波信号 。

By means of the microwave signal source with a wave length of 8mm, nondestructive detect of fiberglass reinforced plastic sucker rod is made. Determination of the optimum frequency point of the signal source is the key technique. The optimum frequency of the signal source is hard to be determined by means of calculation since some of the materials are sensitive to the microwave with a certain frequency or very narrow frequency band. Therefore the optimum frequency point of the signal source is sought by test, so as to acquire the optimum defect reflection signal wave and penetration receiving signal wave. Tests show that, without changing the other parameters of the detecting system, changing the frequency of the signal source will influence greatly the sensitivity reflecting the defect signals; by adopting 36.75GHz microwave signal, the optimum defect reflection signal wave and penetration signal wave of fiberglass plastic sucker rod can be obtained.