Investigation of Pyroelectric and Pyromagnetic Detection.
Final rept. 1 Apr 73-31 Mar 74,
MINNESOTA UNIV MINNEAPOLIS DEPT OF ELECTRICAL ENGINEERING
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A full discussion is given of Mr. V. Singhs capacitive bolometer work. Capacitive bolometer detectors using TGS, and operating in the paraelectric region close to the Curie point, are shown to be comparable in performance for infrared detection with the best thermal detectors. An excess polarization noise was observed that adversely influences the NER. Most of the theoretical work deals with the molecular field model. This model gives the right order of magnitude of psq root of e, which is the figure of merit of the pyroelectric detector a more refined calculation for TGS gives agreement between theory and experiment within 10. The three level model, if realized experimentally, might give better performance near the Curie temperature. The other hope for improvement of pyroelectric detectors lies in decreasing tan delta. Procedures for making contacts and synthesizing ceramic samples are outlined. Au-Cr contacts give reproducible and reliable performance.
- Magnetic and Electric Field Detection and Detectors
- Electricity and Magnetism