SE355246

• Main Author: BEERMAN H,US
• Format: Patent
• Language: English
• Published: 09.04.1973
• Subjects: BASIC ELECTRIC ELEMENTS; CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES ORLIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE; COLORIMETRY; ELECTRICITY; MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT,POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRA-RED,VISIBLE OR ULTRA-VIOLET LIGHT; MEASURING; MEASURING QUANTITY OF HEAT; MEASURING TEMPERATURE; PHYSICS; RADIATION PYROMETRY; TESTING; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR

1,233,162. Pyroelectric detector; image pickup tubes. BARNES ENG. CO. 3 Feb., 1969 [12 Feb., 1968], No. 5648/69. Headings HID and H1K. A pyroelectric detector comprises thin electrodes and a plastics matrix having embedded therein particles of a triglycine addition salt, wherein the particles are of size 3 Á to 100 Á. Triglycine sulphate is ground in acetone with cellulose alkanoate and the suspension sprayed on to a substrate comprising polyethylene terephthalate vacuum-coated with a thin gold layer. After the suspension is set, another gold electrode is vacuum deposited thereon. To assist absorption of IR radiation, the second electrode may be backened, for example by spraying with SiC dispersed in an alkyd resin. Alternatively, a spectral filter layer of P.T.F.E. may be sprayed on the electrode. The electrodes may be nichrome (R.T.M.) whilst the matrix binder may be an alkyd resin. If the matrix is very thick it may be self-supporting. A vidicon tube sensitive to far IR may be formed by spraying a dispersion of triglycine sulphate in a film-forming binder on to a substrate through a fine mask to form a mosaic of pyroelectric detectors which can be scanned by an electron beam to produce a video signal.