为了尽量降低电磁干扰引起的测量误差,在分析了不同性质电磁干扰的基础上,以超声混凝土内裂纹检测实验为例,论述了立足实验室条件降低电磁干扰的一般方法.实验结果表明,综合采用这些方法能够有效降低电磁干扰,增强实验结果的可重复性.%Laboratory-made electronic devices are not possible to make an overall planning and design for electromagnetic shielding as well as the mature developed electronic products which are strictly based on industry standards. Therefore, it makes that the electromagnetic disturbance could affect the accuracy of experimental results. In order to minimize experimental data errors caused by electromagnetic disturbance, after analyzing different types of electromagnetic disturbances, this article designs a general method of reducing electromagnetic disturbance under laboratory conditions. The ultrasonic crack detection is used in concrete as an example. Then, experimental result shows that this approach could effectively reduce low-frequency electromagnetic disturbance, and enhance a strong repeatability of the experimental results.
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