基于开放式TEM小室的电场探头校准及改进方法

王皓琰; 李俊娜; 龚渝涵; 刘建

doi:10.11884/HPLPB202234.210461

基于开放式TEM小室的电场探头校准及改进方法

doi: 10.11884/HPLPB202234.210461

西安交通大学电气工程学院, 西安 710049

基金项目: 装备发展共用技术预研项目(80924010203)

详细信息

作者简介:
王皓琰，why_xjtu@163.com

通讯作者:
李俊娜，uvlina@126.com

中图分类号: O441
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- 文章访问数: 1508
- HTML全文浏览量: 388
- PDF下载量: 89
- 被引次数: 3
出版历程
- 收稿日期: 2021-11-02
- 修回日期: 2021-12-20
- 录用日期: 2021-12-30
- 网络出版日期: 2022-06-16
- 刊出日期: 2022-06-17

Electric field probe calibration and improvement method based on open TEM cell

Xi’an Jiaotong University, School of Electrical Engineering, Xi’an 710049

摘要

摘要: 目前的电场探头标定实验大多只考虑TEM小室结构和性能的影响，在校准实验中，探头的放入使得标定结果产生了很大的偏差，相较于TEM小室，电场探头的尺寸是产生误差的主要原因。以开放式TEM小室为基础，考虑了实际模型和电场探头的影响，利用三维电磁仿真软件，从时域角度研究了不同结构和尺寸TEM小室的辐射场分布，并从频域角度对TEM小室的S参数进行分析。比较了探头放入小室前后的误差，并根据计算结果引入了电场的校准公式。为改善探头对电场的影响，设计了一种新型结构，结果表明，新结构在保证带宽的同时，提高了电场的均匀性和探头标定的准确度。
- TEM小室 /
- 电场探头 /
- 探头扰动 /
- 电场均匀性 /
- 校准公式
Abstract: Most of the calibration experiments of the electric field probe only consider the influence of the structure and performance of the TEM cell. In the calibration experiment, the placement of the probe makes the calibration result produce a large deviation. Therefore, the main reason for the error is the size of the probe, rather than the TEM cell. Taking the actual model and electric field probe into account, in this paper, the radiation field distribution of TEM cells with different structures and sizes is studied from the time domain perspective based on open TEM cells, while the S-parameters of TEM are analyzed from the frequency domain perspective using 3D electromagnetic simulation software. In addition, this paper compares the errors before and after the probe is placed in the chamber, and introduces the electric field calibration formula based on the calculation results. In order to improve the influence of the probe on the electric field, a new structure was designed. The results show that the new structure not only guarantees the bandwidth, but also improves the uniformity of the electric field and the accuracy of the probe calibration, which provides a new idea for the design of the TEM cell and the calibration of the probe.
- TEM cell /
- electric field probe /
- probe disturbance /
- electric field uniformity /
- calibration formula

HTML全文

图 1 开放式TEM小室

Figure 1. Open TEM cell

下载: 全尺寸图片幻灯片

图 2 d=149 mm结构中分别距离芯板和下极板1 mm的电场波形

Figure 2. Electric field waveforms at h=1 mm and h=148 mm when d=149 mm

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图 3 S₂₁和S₁₁参数

Figure 3. S₂₁ parameters and S₁₁ parameters

下载: 全尺寸图片幻灯片

图 4 放入探头的模型

Figure 4. Model with the probe

下载: 全尺寸图片幻灯片

图 5 误差α随h的拟合曲线

Figure 5. Fitting curve of error with h

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图 6 改进结构的TEM小室

Figure 6. TEM cell with improved structure

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图 7 改进结构的S₂₁和S₁₁参数

Figure 7. S₂₁ and S₁₁ parameters of improved structure

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表 1 电场分布及误差

Table 1. Electric field distribution and error

measuring point/mm	amplitude/(V·m⁻¹)	error/%	amplitude/(V·m⁻¹)	error/%	amplitude/(V·m⁻¹)	error/%	amplitude/(V·m⁻¹)	error/%
measuring point/mm	d=149 mm		d=199 mm		d=249 mm		d=299 mm
(0,0, 1)	68843	2.56	51550	2.59	41207	2.60	34334	2.66
(0,0, 40)	68197	1.61	51313	2.11	41065	2.25	34184	2.21
(0,0, 80)	66901	0.32	50671	0.84	40887	1.81	34032	1.76
(0,0, 120)	65741	1.77	49910	0.46	40223	0.15	33775	0.99
(0,0, 160)	—	—	49318	1.86	39891	0.67	33401	0.12
(0,0, 200)	—	—	—	—	39573	1.46	33063	1.14
(0,0, d-1)	65501	2.40	49106	2.28	39199	2.40	32623	2.45

下载: 导出CSV

表 2 放入探头的电场分布及误差

Table 2. Electric field distribution and error after the probe is placed

insulation size	measuring point/mm	amplitude/(V·m⁻¹)	error/%	amplitude/(V·m⁻¹)	error/%	amplitude/(V·m⁻¹)	error/%	amplitude/(V·m⁻¹)	error/%
insulation size	measuring point/mm	d=149 mm		d=199 mm		d=249 mm		d=299 mm
l₁=2 mm l₂=18 mm	(0,0, 1)	78275	16.63	54525	8.51	42449	5.70	34973	4.57
	(0,0, 40)	80811	20.41	54913	9.28	42541	5.93	35071	4.86
	(0,0, 80)	88251	31.49	56975	13.38	42817	6.61	35121	5.01
	(0,0, 120)	—	—	62002	23.38	44270	10.23	35275	5.47
	(0,0, 160)	—	—	—	—	47509	18.30	36282	8.48
	(0,0, 200)	—	—	—	—	—	—	39134	17.01
	(0,0, d−51)	89744	33.72	64210	27.78	51174	27.42	43536	30.17
l₁=10 mm l₂=10 mm	(0,0, 1)	81041	20.75	55809	11.06	43097	7.31	35154	5.11
	(0,0, 40)	84301	25.61	56469	12.37	43213	7.60	35284	5.50
	(0,0, 80)	93231	38.91	59454	18.31	43772	8.99	35418	5.90
	(0,0, 120)	—	—	66239	31.82	45946	14.40	35702	6.75
	(0,0, 160)	—	—	—	—	51000	26.99	37055	10.79
	(0,0, 200)	—	—	—	—	—	—	40062	19.78
	(0,0, d−51)	95022	41.58	69146	37.60	55534	38.28	45989	37.51

下载: 导出CSV

表 3 改进结构的电场分布及误差

Table 3. Electric field distribution and error of improved structure

measuring point/mm	amplitude/(V·m⁻¹)	error/(%)	amplitude/(V·m⁻¹)	error/%	amplitude/(V·m⁻¹)	error/%	amplitude/(V·m⁻¹)	error/%
measuring point/mm	d=149 mm		d=199 mm		d=249 mm		d=299 mm
(0,0, 1)	68829	2.56	51688	2.85	41286	2.80	34512	3.19
(0,0, 40)	68313	1.79	51361	2.21	41127	2.41	34213	2.30
(0,0, 80)	67034	0.12	50797	1.09	40824	1.65	34019	1.72
(0,0, 120)	65880	1.84	50065	0.37	40345	0.46	33720	0.83
(0,0, 160)	—	—	49405	1.68	39871	0.72	33438	0.02
(0,0, 200)	—	—	—	—	39514	1.61	33120	0.97
(0,0, d−1)	65598	2.26	49214	2.06	39332	2.06	32738	2.11

下载: 导出CSV

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