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Absolute linearity measurements on LiTaO3 pyroelectric detectors.

Theocharous, E (2008) Absolute linearity measurements on LiTaO3 pyroelectric detectors. Appl. Opt., 47 (18). pp. 3397-3405.

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The non-linearity characteristics of a number of LiTaO3 pyroelectric detectors were experimentally investigated using the NPL detector linearity characterization facility. All the detectors examined were shown to exhibit a super-linear response, i.e. the responsivity of the detectors increases as the incident radiant power increases. The temperature coefficient of response of the some of these LiTaO3 pyroelectric detectors was measured and found to be around +0.2% oC-1. The super-linear behaviour of the LiTaO3 pyroelectric detectors was attributed to the positive temperature coefficient of response values of these detectors. Moreover, the linearity factor of gold-black-coated LiTaO3 pyroelectric detectors was shown to exhibit a dependency on the area of the spot illuminating the active area of the detector, i.e. on the incident irradiance. Possible reasons for the observed behaviour are proposed and discussed. Some variations in the slopes of the plots of the linearity factor versus irradiance for different areas being illuminated have been assigned to the poor spatial uniformity of response of these detectors.

Item Type: Article
Keywords: LiTaO3 detectors, Infrared, Linearity of response, Pyroelectric detectors, Super-linearity, Temperature coefficient of response
Subjects: Optical Radiation and Photonics
Optical Radiation and Photonics > Radiometry and Detectors
Last Modified: 02 Feb 2018 13:15
URI: http://eprintspublications.npl.co.uk/id/eprint/4216

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