SWIR vs NIR
Thermal management and heat inspection is a constant challenge in various machine vision projects. As heat is something that is not visible to the human eye, thus we need a system and vision component that could detect heat in real-time for various project purposes. SODA VISION tech team has devised the latest case study on heat inspection while comparing SWIR (Short-Wave Infrared) and NIR (Near-Infrared) cameras.
The Acuros™️ HD SWIR Camera and Basler acA2040-90umNIR Camera with Computar SWIR lens attached to respective cameras were set up to inspect the radiation emitted on the electric soldering iron (as shown in the picture below). The goal of this project is to inspect radiation emitted in real-time at a very high temperature. Generally, SWIR cameras are known to be a useful tool for high-temperature inspection applications as it is able to detect temperature from >250°C which tends to emit high radiation that falls within the range of SWIR camera wavelength.
Thus, in the video below, we can see that the image where the electric soldering iron is lighted up when the temperature is increased to above 250°C, on the other hand, using the NIR camera heat was not detected in real-time.
High-temperature objects emit large and constant values in the SWIR, MWIR (Medium-Wave Infrared), or LWIR (Long-Wave Infrared) region. This is known as thermal imaging. The thermal imager is good at detecting the presence of a heated object against a cool background, however, a SWIR camera can actually identify what that object is. This is because a thermal imager does not give the resolution and dynamic range of possible imaging.
SWIR cameras are useful in identifying high-temperature thermal imaging (>150°C) applications. Some examples include industrial furnace inspection, hot glass bottle inspection, detection of slag impurities in molten metal and even capturing firefighters through glass and smoke.
Machine Vision imaging requires cameras that can see the smallest defects operate at fast frame rates and image with a wide field-of-view. Industrial imaging also requires cameras with the lowest cost per megapixel.
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If you would like to know more about SWIR and NIR applications and how you can apply it to your projects, feel free to reach out to us and we will be more than happy to provide you with our professional advice!