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Evaluation of dome-input geometry for pyroelectric detectors



Jinan Zeng, Leonard M. Hanssen, George P. Eppeldauer


Dome-input pyroelectric radiometers with different black coatings were developed to extend the spectral responsivity scale from near infrared (NIR) to 20 μm. The reflective dome with shiny gold-coating has been known to be an efficient light trap to enhance the detector absorptance and to minimize spectral responsivity variation. The enhancement of spectral responsivity using reflective dome relies on optical characterization of black coating on detector, reflectance of dome reflector, and input aperture dimension, etc. We report a comparison of spectral responsivity of dome-input pyroelectric radiometers measured with/without dome-trap from 2.4 μm to 14 μm using the Infrared Spectral Comparator Facility (IRSCF) at NIST. The results show 4 % to 8 % gain of responsivity for two dome-input pyroelectric detectors, with reduced structure of spectral responsivity. The uncertainty of dome-input pyroelectric radiometer calibrations is approximately 2 % (k = 2).
Proceedings Title
Proceedings of SPIE Vol 8706
Conference Dates
April 29-May 3, 2013
Conference Location
Baltimore, MD


Spectral responsivity, dome-input pyroelectric radiometer, specular and diffuse reflectance, absorptance, organic black coating, noise-equivalent-power


Zeng, J. , Hanssen, L. and Eppeldauer, G. (2013), Evaluation of dome-input geometry for pyroelectric detectors, Proceedings of SPIE Vol 8706, Baltimore, MD, [online], (Accessed May 17, 2024)


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Created June 24, 2013, Updated February 19, 2017