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Working Principles
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Applications
A near-field probe is a device used for detecting and measuring electromagnetic fields, especially suited for electromagnetic compatibility (EMC) testing and electromagnetic interference (EMI) diagnosis in electronic devices and circuits. The working principles and applications of near-field probes are as follows:
Working Principles
Electromagnetic Field Detection
Near-field probes use antennas or sensors to detect electromagnetic fields. Depending on the probe's design, it can detect electric fields, magnetic fields, or a combination of both. Common types of near-field probes include electric field probes and magnetic field probes.
Signal Conversion
The electromagnetic field signals detected by the probe are converted into voltage signals through built-in conversion circuits. These signals can then be transmitted to measuring equipment, such as oscilloscopes or spectrum analyzers.
Signal Analysis
The measuring equipment processes and analyzes the received voltage signals to determine the frequency, intensity, and source of electromagnetic interference.
Applications
Electromagnetic Compatibility Testing
- EMC Testing: During the development of electronic products, near-field probes are used to detect electromagnetic emissions from circuit boards and components to ensure they comply with EMC standards.
- EMI Diagnosis: During the development and testing stages of a product, near-field probes help locate and diagnose sources of electromagnetic interference, enabling measures to reduce interference.
Circuit Board Troubleshooting
Near-field probes are used to check noise and interference sources on circuit boards, helping engineers quickly locate fault areas, especially in complex circuits.
Antenna Testing
Near-field probes are used for near-field testing of antennas to analyze and optimize antenna performance. They can measure the radiation pattern and field strength distribution of the antenna.
Shielding Effectiveness Testing
Near-field probes evaluate the effectiveness of shielding materials or shielding enclosures by measuring the difference in electromagnetic field strength inside and outside the shield.
Advantages
High Resolution
Near-field probes can provide very high spatial resolution, allowing precise localization of interference sources.
Portability
They are usually designed to be compact and portable, suitable for on-site testing and rapid diagnosis.
Non-Invasive
Using near-field probes for detection does not affect the device being tested.
In summary, near-field probes play a crucial role in the development, testing, and troubleshooting of electronic products, helping engineers improve electromagnetic compatibility, reduce electromagnetic interference, and enhance product quality and reliability.
