Detection Of Optical Radiation Research Articles

Detection of electromagnetic radiation using the pyroelectric effect

Various ferroelectric crystals and ceramics are assessed as detectors of optical, infrared, and microwave radiation. The noise equivalent power, responsivity, and response time are measured on BaTiO 3 and triglycine sulfate crystals as a function of radiation frequency, modulation frequency, temperature, and circuit parameters. Linearity of response of pyroelectric detectors to microwave radiation is studied at 5·6 and 10·5 Gc. Appearance of particularly sensitive regions in pyroelectric crystals and unusual effects of humidity on polarization characteristics of triglycine sulfate crystals are reported.

The extrusion of bismuth wire

The article reviews the preparation of bulk alkali halide crystals from the melt, including their purification from oxygen by reactive atmosphere treatments; purification from alkali earth and heavy metals ions by zone melting; and growth process by the traditional methods of Bridgman–Stockbarger, Kyropoulos, and Czochralski. Some important applications of alkali halide crystals as optical windows and radiation detectors are also discussed.