比吸收率测量系统验证方法分析及扩展

庞新华; 周鑫; 武彤; 沈庆飞; 唐维; 李安香; 穆晓彤; 杨超

doi:10.12338/j.issn.2096-9015.2023.0357

比吸收率测量系统验证方法分析及扩展

doi: 10.12338/j.issn.2096-9015.2023.0357

庞新华^1,,
周鑫^1, ,,
武彤¹,
沈庆飞¹,
唐维¹,
李安香¹,
穆晓彤²,
杨超³

1.
中国计量科学研究院，北京 100029
2.
北京航空航天大学，北京 100191
3.
信宝检测有限公司，东莞 523000

基金项目: 国家重点研发计划（2022YFF0604805）；广东省重点领域研发计划（2020B0404030006）。

详细信息

作者简介:
庞新华（1998-），中国计量科学研究院在读研究生，研究方向：电磁测量技术等，邮箱：pangxh123@163.com

通讯作者:
周鑫（1980-），中国计量科学研究院副研究员，研究方向：电磁照射计量，邮箱：zhouxin@nim.ac.cn

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出版历程
- 收稿日期: 2023-12-20
- 录用日期: 2024-01-08
- 修回日期: 2024-01-18
- 网络出版日期: 2024-03-12

Analysis and Extension of Validation Methods for SAR Measurement Systems

1.
National Institute of Metrology, Beijing 100029, China
2.
BEIHANG UNIVERSITY, Beijing 100191, China
3.
BTL Testing Group, Dongguan 523000, China

摘要

摘要: 比吸收率作为涉及无线通讯产品的电磁辐射人身安全性的必检参数，由于被测设备的更迭，其测量系统及测量方法也需要随之更新，故而对测量系统的验证提出了新的要求。基于对现行标准中验证方法的深入理解，通过电磁仿真及实验测量，对外推、探头线性度和探头调制响应三个传统验证项目的验证方法进行了测量分析，并结合新测试新需求，对验证方法进行了扩展。实测结果表明扩展验证方法具有可行性及稳定性。由于通过自研方法获得参考值，因此可以根据需要扩展验证方法，对验证点位等验证配置进行自定义设置，为研究新型及国产比吸收率测量系统的验证方法提供了技术支撑。
- 计量学 /
- 比吸收率 /
- 移动终端 /
- 系统验证 /
- Local SAR
Abstract: Specific Absorption Rate (SAR), as a mandatory parameter for the personal safety of electromagnetic radiation involving wireless communication products, has new requirements for the validation of the measurement system as its measurement method and measurement system need to be updated due to the change of the device under test. Based on the in-depth understanding of the validation methods in the current standard, the validation methods of the three traditional validation steps, namely, Extrapolation routine verification, Probe linearity verification and others, are measured and analyzed through electromagnetic simulation and experimental measurements, and the validation methods are extended by combining with the new requirements of the new test. The measured results show the feasibility and stability of the extended verification method. Since the reference values are obtained by the self-developed method, the validation method can be extended and the validation configurations, such as the validation points, can be customized according to the needs. This provides technical support for the study of the validation method for new and domestic SAR measurement systems.
- metrology /
- specific absorption rate(SAR) /
- mobile terminal /
- system verification /
- local SAR

HTML全文

图 1 研究思路图

Figure 1. Conceptual framework

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图 2 稳定辐射源设计图

Figure 2. Stable radiation source design diagram

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图 3 系统验证装置图

Figure 3. System verification device diagram

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图 4 仿真结果图

Figure 4. Simulation results graph

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图 5 测量系统及仿真的结果比较图Y=0

Figure 5. Comparison of the results of the measurement system and the simulation of the graph Y=0

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图 6 测量系统及仿真的结果比较图Y=20

Figure 6. Comparison of the results of the measurement system and the simulation of the graph Y=20

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图 7 重复性实验结果分析Y=0

Figure 7. Repeatability of experimental results analysis Y=0

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图 8 重复性实验结果分析Y=20

Figure 8. Repeatability of experimental results analysis Y=20

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图 9 连续波信号的探头线性-Local SAR值验证结果分析

Figure 9. Analysis of probe linear-local SAR value verification results for continuous wave signals

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图 10 周期性脉冲调制信号的探头线性验证结果分析

Figure 10. Analysis of probe linearity verification results for periodic pulse modulated signals

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表 1 仿真值及标准值的比较

Table 1. Comparison of simulated and standard values

测量参数	仿真值/(W·kg⁻¹)	标准值/(W·kg⁻¹)	误差/%
SAR_1g	40.79	39.7	2.7
SAR_10g	21.15	20.5	3.2

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表 2 实测值及标准值的比较

Table 2. Comparison of measured and standard values

测量参数	实测值/(W·kg⁻¹)	标准值/(W·kg⁻¹)	误差/%
SAR_1g	37.6	39.7	−5.3
SAR_10g	19.7	20.5	−3.8

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表 3 仿真值及标准值的比较

Table 3. Comparison of simulated and standard values

测量点坐标/ mm	仿真值/(W·kg⁻¹)	标准值/(W·kg⁻¹)	误差/%
Y=0	77.3	72.1	7.2
Y=20	6.53	6.60	−1.1

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表 4 测量外推值及标准值的比较

Table 4. Comparison of measured extrapolated and standard values

测量点坐标/ mm	测量外推值/(W·kg⁻¹)	标准值/(W·kg⁻¹)	误差/%
Y=0	69.2	72.1	−4.0
Y=20	6.52	6.60	−1.2

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表 5 重复性实验结果分析

Table 5. Analysis of repeatability experiment results

	Y=0	Y=20
1	69.13	6.48
2	68.80	6.56
3	68.84	6.50
4	68.81	6.61
5	68.84	6.51
6	71.19	6.50
7	71.29	6.62
8	68.87	6.64
9	71.12	6.64
10	71.14	6.52
U(95%)	3.20%	1.80%

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表 6 归一化平均SAR值探头线性验证结果

Table 6. Normalized average SAR value probe linearity validation results

天线端辐射功率/ mW	1 g SAR 归一化值/ (W·kg⁻¹)	10 g SAR 归一化值/ (W·kg⁻¹)	1 g SAR 误差/%		10 g SAR 误差/%
0.2	36.95	18.20	−1.7	−7.7
0.5	38.20	19.56	1.6	−0.8
5	36.40	19.00	−3.2	−3.7
10	38.80	20.30	3.2	2.9
50	38.60	20.20	2.7	2.4
100	38.30	20.10	1.9	1.9
200	37.60	19.70	0.0	−0.1
250	37.60	19.72	0.0	0.0
300	38.00	20.03	1.1	1.6
500	36.80	19.44	−2.1	−1.4

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表 7 归一化Local SAR值探头线性验证结果

Table 7. Normalized Local SAR value probe linearity verification results

天线端辐射功率/ mW	Local SAR归一化值/ (W·kg⁻¹)	Local SAR 误差/%
0.2	33.42	−4.4
0.5	35.06	0.3
5	35.84	2.6
10	35.88	2.7
50	35.56	1.8
100	35.26	0.9
200	34.75	−0.5
250	34.94	0.0
300	34.73	−0.6
500	34.70	−0.7

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表 8 平均SAR周期性脉冲调制信号探头线性验证结果

Table 8. Periodic pulse modulated signal probe linearity verification results of averaged SAR

平均SAR /g	仿真值/ (W·kg⁻¹)	标准值/ (W·kg⁻¹)	参考值/ (W·kg⁻¹)	误差/%
1	0.937	37.48	37.60	-0.3
10	0.495	19.80	19.72	0.4

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