PbS and PbSe, with cut-off wavelengths of up to 3.4μm and 5.2μm detectors generally work in light guide mode. Compared with thermal detectors, it has a high signal-to-noise ratio and fast response speed, and can work at room temperature. However, the dark resistance and response characteristics are easily affected by the external environment such as ultraviolet light, temperature, etc.,which needs to be in a stable environment or use a cooling method to make the detector work in the best state.
Application: boiler control, gas analysis, paper industry, non-contact temperature measurement, humidity monitoring, etc.