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Medium-wave infrared narrow band filter with wavelength of 5.25 microns

A narrow-band filter and medium-wave technology, which is applied in the field of narrow-band infrared filters and infrared gas analysis instruments, can solve the problems of weak infrared characteristic absorption peaks, low nitric oxide content, short detector life, etc., and achieve satisfactory performance Requirements, good waveform rectangularity, and the effect of improving resolution

Active Publication Date: 2011-03-16
SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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Problems solved by technology

However, the nitric oxide content in the target gas is usually low, and the infrared characteristic absorption peak is weak, making it difficult to measure
Therefore, at present, chemical methods and thin-film thermal detection methods are widely used at home and abroad, and there are problems such as short life of detectors or high cost.

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  • Medium-wave infrared narrow band filter with wavelength of 5.25 microns
  • Medium-wave infrared narrow band filter with wavelength of 5.25 microns
  • Medium-wave infrared narrow band filter with wavelength of 5.25 microns

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Embodiment Construction

[0019] Since the patented optical filter adopts a multi-half-wave structure and a high-level film system with a spacer layer, the passband rectangularity is improved, and the passband width is narrowed to increase the resolution of nitric oxide gas. The lead telluride material with high refractive index and narrow bandgap is selected, and its intrinsic absorption characteristics are used to cut off the secondary peak less than 4.0 microns, and the cut-off depth is increased. The aluminum oxide crystal with a thickness of 0.5 mm and a polished surface is used as the substrate, and the secondary peak after the filter is cut off at 7.7 microns.

[0020] The front film layer and the back layer are respectively realized by vacuum coating, and zinc selenide and lead telluride film materials are alternately vapor-deposited on the two surfaces of the substrate (attached figure 1 ).

[0021] In order to effectively obtain the nitric oxide gas concentration parameters, the positioning ...

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Abstract

The invention discloses a medium-wave infrared narrow band filter with a wavelength of 5.25 microns, which is prepared by taking an aluminum oxide crystal as a substrate and taking zinc selenide and lead telluride as film layer materials through a vacuum film deposition method. A main film system is in a multi-half-wave and high-order separating layer film system structure and is matched with a secondary peak cutting-off film system with high cutting-off depth, thus the main film system has good effect on inhibiting interference of other gases. The filter is a critical component of a nitric oxide infrared analyzer and is suitable for batch production. The optical performance of a product and the physical strength of a film layer meet the actual use requirements. The invention is suitable for trace nitric oxide gas analyzers in the fields of environmental protection, petrochemical industry and the like.

Description

technical field [0001] This patent relates to a narrow-band filter optical element, specifically a narrow-band infrared filter with a center wavelength of 5.25 microns, which is specially used for infrared gas analysis instruments. Background technique [0002] Nitric oxide infrared optical analysis instruments are widely used, and the detection of gas content has the characteristics of real-time, continuous and reliable. However, the content of nitric oxide in the target gas is usually low, and the infrared characteristic absorption peak is weak, so it is difficult to measure. Therefore, at present, chemical methods and thin-film thermal detection methods are mostly used at home and abroad, and there are problems such as short life of detectors or high cost. As the core component of the nitric oxide infrared analysis instrument, the new 5.25 micron wavelength narrow-band infrared filter can increase the filter's ability to distinguish nitric oxide and improve the detection...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/28
Inventor 张麟黄春倪榕
Owner SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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