Thermal camera is being increasingly used a “Night Vision” camera and rightly so. Night Vision has much wider real world usage/application then “con-contact temperature measurement”. Thermal Cameras of Thermal sensors are capable of doing both. And as for developers point of view, using thermal camera as night vision device is much simpler, and faster to manufacture or calibrate too.
When a Thermal Camera is used as a night vision device, it does not require to measure temperature. So, the temperature calibration, compensation and related processing is not required. It makes life of a Thermal Camera manufacturer or developer much easier. All it has to do is, provide corrections and produce an image as sharp as possible.