Research on Long-wave Low-Temperature Water Vapor Filters
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Citation
张麟 (Zhang Lin), 黄春 (Huang Chun), 张素英 (Zhang Suying), 李斌 (Li Bin). 长波低温水汽滤光片的研制 [Research on Long-wave Low-Temperature Water Vapor Filters]. [Publication Venue to be determined], [Publication Date to be determined], [Page numbers to be determined].
Keywords
- 长波 / Long-wave
- 低温 / Low temperature
- 水汽滤光片 / Water vapor filter
- 中心波长漂移 / Center wavelength drift
- 宽带滤光片 / Broadband filter
- 锗 / Germanium
- 硒化锌 / Zinc selenide
- 碲化铅 / Lead telluride
- 真空薄膜沉积方法 / Vacuum thin film deposition method
- 光谱间的串音 / Spectral crosstalk
- 波形系数 / Waveform coefficient
- 折射率温度系数 / Refractive index temperature coefficient
- 带通边缘陡度 / Bandpass edge steepness
- 膜层内应力 / Internal stress of film layers
Brief
The article discusses the design and fabrication of a long-wave broadband filter specifically for low-temperature water vapor detection, utilizing specific materials to achieve minimal center wavelength drift and high transmittance at low temperatures.
Summary
This article focuses on creating a long-wave broadband filter specifically designed for low-temperature water vapor detection. The research addresses the common issues of center wavelength drift and transmittance reduction that occur in such filters at low temperatures. The filter is fabricated using germanium as a substrate and zinc selenide and lead telluride as thin film materials through vacuum deposition. The design and fabrication process aims to achieve minimal center wavelength drift, high transmittance in the selected wavelength region, and good bandpass characteristics. A high-temperature annealing treatment is used to improve the film's adhesion and reduce stress. The performance of the fabricated filter is evaluated using a Fourier transform infrared spectrophotometer with a low-temperature measurement system. The findings indicate that the fabricated filter exhibits small center wavelength drift and maintains good performance at low temperatures.
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