Identification of parameters of measuring modules based on pyroelectric materials

This paper addresses the topical issues in using pyrodetectors within measurement modules of modern monitoring systems. A major issue is the optimal selection of detectors, hindered by incomplete or missing parameter specifications in technical documentation, limiting effective mathematical modelling. The study proposes a method to identify critical pyrodetector parameters – thermal τT and electrical τE time constants – using experimental data from their key characteristics. It is demonstrated that these parameters can be determined by approximating experimental dependencies in both frequency (amplitude responses) and time domains (transient responses). The experimental setup and procedure for recording pyroresponses to step changes in IR radiation are detailed. Approximation of transient responses using a dual time-constant model enables precise parameter estimation. Validation involves comparing model calculations with experimental measurements across commercial IR pyrodetectors, revealing response durations from 30 s to 7 min. The challenge of distinguishing τT from τE via approximation is discussed. The method improves metrological support for pyroelectric measurements and can be used to select detectors and design complex pyroelectric systems.