Application of nano-retardation coating in pyroelectric infrared sensor

The invention discloses application of a nano-retardation coating in a pyroelectric infrared sensor, and aims to provide new application of the nano-retardation coating. The application of the nano-retardation coating in the pyroelectric infrared sensor is realized by the following steps: fully stirring nano titanium dioxide and an organic solvent to obtain a titanium dioxide sol; uniformly coating the titanium dioxide sol on the outer surface of a window lens of the pyroelectric infrared sensor by using a coating method; and drying the outer surface of the window lens of the pyroelectric infrared sensor in a constant temperature box. The characteristic that the optical retardation performance of the nano titanium dioxide is very stable is effectively utilized, so that the situation that an amplification circuit must be regulated due to the inconsistency of the sensing sensitivities of the sensor is avoided, production process is simplified, the stability of a product is improved, production time is saved, an