Infrared Thermal Imaging Knowledge Ⅲ

1.Question: What are the characteristics of infrared thermal imaging monitoring?

A: Clear observation in all-black or strong backlighting, minimal impact from adverse environments such as smoke, snow, rain, and fog, reflects thermal differences.

2.Question: What is the spectral response range (short wave to long wave) for commonly used infrared detectors?

A: 1-3μm, 3-5μm, 8-14μm.

Note: The infrared band ranges from 0.78μm to 1000μm, but due to the strong absorption of infrared by the atmosphere, only three bands of infrared can pass through the atmosphere, also called the atmospheric window of infrared: short-wave infrared 1-3μm, mid-wave infrared 3-5μm, long-wave infrared 8-14μm.

3.Question: What is the minimum working temperature for long-wave cooled infrared detectors to be considered as high-temperature devices?

A: 90K.

4.Question: Which gas can be detected by refrigerated infrared thermal imaging in the range of 3.2-3.5μm?

A: Methane, ethanol, and acetone.

Note: A 3.2-3.5μm gas detection thermal imager is commonly used for detecting volatile organic compounds (VOCs) gas.

5.Question: The field of view reflects how large an area the infrared thermal imager can cover, so what factors does the field of view depend on?

A: The field of view is directly proportional to the resolution, pixel size, and inversely proportional to the focal length.

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