Influence of spectral characteristics of IR (8-12 mkm) photo-detectors on thermovision system parameters

摘要

The calculations of noise equivalent temperature difference (NETD) for thermovision devices are carried out, with cut-off wavelengths of photo detectors (lambda_co) and distance to target used as parameters. For the estimation of influence of the photodiode spectral characteristics on the parameters of thermovision systems several characteristics were taken into account: the spectrum of radiation of object, transmission of an atmosphere and spectral characteristic of sensitivity of photo-diode array. The results show that an increase of lambda_co above 10,5 microns at small distances improves the temperature resolution not more than 15