For non-contact temperature measurement applications (such as food detection, or high temperature, strong corrosion, strong electromagnetic environment, etc.) , the infrared radiation intensity of the detected object is detected by the thermopile sensor in the infrared sensor module, high precision non contact temperature measurements are achieved by high precision amplification and differential analog to digital conversion circuits, with ambient temperature compensation and application-specific integrated circuit for digital signal processing, and convert it to a high-resolution digital signal of a temperature reading.