The best wavelength of infrared radiation for detecting temperature differences depends on the specific application and the temperature range being considered. Infrared radiation encompasses a broad range of wavelengths, and different wavelengths have different properties and sensitivities to temperature variations.
In general, the mid-wave infrared (MWIR) and long-wave infrared (LWIR) regions of the spectrum are commonly used for temperature detection and thermal imaging applications. The MWIR region typically ranges from approximately 3 to 5 micrometers (μm), while the LWIR region spans from approximately 8 to 14 μm.
The choice between MWIR and LWIR depends on factors such as the desired temperature range, atmospheric conditions, and the objects being observed. MWIR is often preferred for detecting temperature differences in objects at higher temperatures, such as hot machinery or combustion processes. LWIR, on the other hand, is well-suited for lower temperature ranges and applications where atmospheric effects, such as water vapor absorption, need to be minimized.
It's important to note that specific infrared sensors and cameras are designed to operate within certain wavelength ranges, and their effectiveness in detecting temperature differences can vary based on the chosen wavelength and the sensitivity of the equipment.
In summary, the selection of the best wavelength of infrared radiation for detecting temperature differences depends on the specific requirements of the application, including the temperature range and environmental conditions involved.