A thermal lens is a device capable of detecting the surface temperature of an object, which generates an image by receiving infrared radiation emitted by the object. This technology has a wide range of applications in many fields, including industrial, medical, security and so on. For example, in the industrial sector, thermal imaging lenses can be used to detect the temperature distribution of equipment in order to detect potential failures in time. In the medical field it can help doctors diagnose diseases such as cancer. In the field of security, thermal imaging lenses can be used to monitor the movement of people in an area.