Series pyroelectric ceramics used for small area IR detector

Abstract

Theoretical relationship between the detectivity of small area IR detector with a capacitance compensated preamplifier and the parameters of pyroelectric materials was investigated. The series Sr doped pyroelectric ceramics based on PbZrO/sub 3/-PbNbFeO/sub 3/-PbTiO/sub 3/ system were manufactured. The pyroelectric coefficient ranges of above system are 4.4-7.2/spl times/10/sup -4/ cm/sup -2/ K/sup -1/ and the permittivity ranges are 290-500. Above materials were used to make small area (/spl phi/0.3 mm) IR detector. There is a very good agreement between measured and calculated D* values. The highest detectivity D* of small area IR detector with the thickness 0.035 mm is 3/spl times/10/sup 8/ cm Hz/sup 1/2/ W/sup -1/, which shows that this type pyroelectric ceramics had a strong potential to be a good candidate in focal plane thermal imaging arrays application.