输入功率对电磁混响室特征参数影响的实验研究  

Experimental Study on the Influence of Input Power on Characteristic Parameters of Electromagnetic Reverberation Chambers

作　　者：张昊民 郭晓涛[1] 刘科[1] 刘天鑫 ZHANG Haomin;GUO Xiaotao;LIU Ke;LIU Tianxin(National Institute of Metrology,Beijing 100029,China)

机构地区：[1]中国计量科学研究院,北京100029

出　　处：《计量科学与技术》2024年第8期51-57,共7页Metrology Science and Technology

基　　金：国家重点研发计划项目(2022YFF0604805)。

摘　　要：电磁混响室的校准通常是在较低输入功率下面向场均匀性和归一化场强等特征参数进行,但在电磁兼容抗扰度测试等实际应用中,实际工作在较高输入功率条件下,目前相关国际和国内标准中对此差异是予以忽略的,没有给出具体理论或实验证明。设计并开展了具体的实验研究,确认了输入功率对电磁混响室特征参数的影响程度。其中,低输入功率下的校准采用基于三维光电场探头的快速校准技术方案,高输入功率下的参数测量与汽车零部件抗扰度测试的实际工作状态保持一致。实验结果表明,不同输入功率对场均匀性这一特征参数的影响基本在±0.5 dB以内,对归一化场强的影响在2 dB以内。进一步的,基于对实验结果的分析,给出了相应的电磁混响室校准和测试过程中对场均匀性和归一化场强标定的建议。Electromagnetic reverberation chambers are typically calibrated for characteristic parameters such as field uniformity and normalized field strength under low input power conditions.However,in practical applications like electromagnetic compatibility immunity testing,these chambers operate under high input power conditions.Currently,relevant international and domestic standards ignore this difference,providing no specific theoretical or experimental evidence.This paper presents a designed experimental study to investigate the influence of input power on the characteristic parameters of electromagnetic reverberation chambers.A rapid calibration technique using 3D photoelectric field probes was employed for low input power calibration,while high input power parameter measurements were conducted under conditions consistent with actual automotive component immunity tests.Results show that the impact of different input power levels on field uniformity is generally within±0.5 dB,and the effect on normalized field strength is within 2 dB.Based on these findings,recommendations are provided for calibrating field uniformity and normalized field strength during electromagnetic reverberation chamber calibration and testing processes.

关 键 词：计量学 电磁混响室 场均匀性 归一化输入功率 抗扰度测试 

分 类 号：TB973[一般工业技术—计量学]