研究目的
将现有的屏蔽摄像机外壳改装为新型低成本商用现货网络摄像机,并根据IEC 61000-4-21标准在混响室中测试其辐射抗扰度和发射性能。
研究成果
经过改装的屏蔽式摄像机外壳,搭载新型IP摄像头和光纤通信系统,在抗扰度测试中成功抵御了高强度电磁场干扰,且未出现显著高于本底噪声的辐射信号,为混响室监测提供了一种经济可靠的解决方案。
研究不足
该研究仅限于所使用的特定混响室和设备;频率范围受可用放大器和分析仪的限制,且由于采用了商用现货组件,该解决方案在技术功能上可能存在轻微缺陷。
1:实验设计与方法选择:
该实验涉及为屏蔽式摄像机外壳加装新型IP摄像机及用于光纤通信的媒体转换器,随后依据IEC 61000-4-21标准在混响室中进行辐射抗扰度与发射测试。
2:样本选择与数据来源:
根据尺寸与兼容性要求选定屏蔽外壳与摄像机;测试期间通过场探头和功率计采集数据。
3:实验设备与材料清单:
包含屏蔽式摄像机外壳、Inkovideo摄像机、媒体转换器、光纤、屏蔽电池、信号发生器、功率放大器、定向耦合器、功率计、天线、搅拌器、场探头、频谱分析仪及控制装置。
4:实验流程与操作步骤:
搭建过程包括在屏蔽外壳内连接摄像机与媒体转换器,采用屏蔽电池供电,通过光纤传输数据,并针对特定频率范围执行抗扰度与发射测试(含搅拌器操作)。
5:数据分析方法:
使用MATLAB计算电场强度与功率水平,Python进行数据记录。
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Signal Generator
SMR20
Rohde & Schwarz
Generates the signal for the radiated immunity test.
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Power Meter
NRVD
Rohde & Schwarz
Measures transmitted and reflected signal power on the transmitting side.
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Power Meter
NRVS
Rohde & Schwarz
Measures reference power on the receiving end.
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RF Amplifier
BBA150
Rohde & Schwarz
Amplifies the signal for frequencies from 1 GHz to 3 GHz.
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Antenna
HF906
Rohde & Schwarz
Used as transmitting and receiving antenna for frequencies above 1 GHz.
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Spectrum Analyzer
FSP
Rohde & Schwarz
Measures the maximum received power for radiated emission tests.
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Camera
V-110HD
Inkovideo
Used for surveillance and providing live-video feed of the device under test in the reverberation chamber.
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Media Converter
EIS-x-Sx-Series
Advantech (A. B. SmartWorx)
Converts electrical signals on LAN cables to optical signals on fiber optic cables and vice-versa for communication with the camera.
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Directional Coupler
DC6080
Amplifier Research
Feeds a portion of the forward and backward traveling power to power meters for measurement below 1 GHz.
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Directional Coupler
DC7144
Amplifier Research
Feeds a portion of the forward and backward traveling power to power meters for measurement above 1 GHz.
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RF Amplifier
10W1000A
Amplifier Research
Amplifies the signal for frequencies below 1 GHz.
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Antenna
VULP 9118 C
Schwarzbeck
Used as transmitting and receiving antenna for frequencies below 1 GHz.
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Software
SADP
Inkovideo
Used to change the IP settings of the camera for network configuration.
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Software
MATLAB
The MathWorks
Used for data analysis, including calculating electric field strengths.
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