Why need a thermal imaging shutter

A thermal imaging shutter is a device that blocks or allows thermal radiation to pass through it, depending on its position. It is typically made of a material with high thermal conductivity and can be controlled electronically. The shutter is used in thermal imaging cameras to control the amount of thermal radiation that enters the camera sensor, improving the quality and accuracy of the thermal image. When the shutter is open, thermal radiation is allowed to pass through and is detected by the camera sensor. When the shutter is closed, the camera is protected from external thermal sources and can be recalibrated for greater accuracy.