研究目的
To investigate the impact of warm filters and elevated background temperature on the operation of an uncooled wideband camera used for optical gas imaging (OGI).
研究成果
The study demonstrated that warm interference filters significantly affect the NETD parameter of uncooled OGI cameras by reducing scene radiation and increasing system noise. Elevated background temperatures were shown to improve the camera's signal-to-noise ratio but also introduced convective air movements that could degrade image quality. The proposed CSNETD parameter effectively quantified the combined effects of camera noise and scene temperature fluctuations on OGI performance. The findings suggest that careful consideration of filter selection and background temperature is essential for optimizing uncooled OGI camera performance in industrial applications.
研究不足
The study highlights the technical constraints of using warm filters, such as increased system noise and reduced scene radiation reaching the FPA. It also notes the challenges of imaging gas leaks at low background temperatures and the need for further optimization of filter passbands for specific gases and temperature ranges.
1：Experimental Design and Method Selection:
The study involved designing a wideband uncooled OGI camera based on a VOx microbolometer FPA and measuring the NETD parameter with and without an interference filter. A new parameter, CSNETD, was proposed to quantify both the camera and scene noise.
2：Sample Selection and Data Sources:
Methane was used for gas leak imaging tests, with its absorption spectra matching the transmission bands of the selected filters.
3：List of Experimental Equipment and Materials:
A VOx wideband OGI camera, Spectrogon BP-3317–215 nm (3.2–3.4 μm) and BP-7720–480 nm (7.5–8.0 μm) bandpass interference filters, and a blackbody surface for background temperature control.
4：2–4 μm) and BP-7720–480 nm (5–0 μm) bandpass interference filters, and a blackbody surface for background temperature control.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: NETD measurements were performed with different camera configurations and background temperatures. Methane leaks were imaged against various backgrounds to evaluate the camera's performance.
5：Data Analysis Methods:
The standard deviation of temporal variations in pixel signals was calculated to determine NETD values. CSNETD was used to evaluate the impact of increased background temperature on system performance.
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