研究目的
Investigating the use of a Binary Zone Plate (BZP) based IR spectrometer for dissolved gas analysis in high voltage equipment to predict possible faults.
研究成果
The BZP-based spectrometer effectively discriminates between all key fault gases in high voltage equipment by adjusting the focal length, proving its function as an effective swept wavelength filter for DGA.
研究不足
The study does not detail the practical implementation challenges or the cost comparison with existing methods like FTIR and PAS.
1：Experimental Design and Method Selection:
The study presents a spectrometer based on a BZP for IR spectral discrimination. The BZP's wavelength selective focal length discriminates between wavelengths by adjusting the focus distance onto an aperture.
2：Sample Selection and Data Sources:
The study focuses on six key gases in high voltage equipment, using their absorption coefficients from the HITRAN database.
3：List of Experimental Equipment and Materials:
Includes an infrared emitter, a chamber for gas absorption, a BZP lens, an aperture, and an IR detector. A chopper and lock-in amplifier are used for sensitivity improvement.
4：Experimental Procedures and Operational Workflow:
The BZP lens moves linearly along the optical axis to selectively focus on wavelengths of interest. The absorbed energy is measured after passing through the aperture.
5：Data Analysis Methods:
The Aperture Restricted Effective Spectral Radiosity (ARESR) is introduced to evaluate the lens's ability to discriminate between spectral bands.
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