| 摘要 |
1,126,427. Thermocouples. HUGHES AIRCRAFT CO. 19 April, 1967 [2 May, 1966 (2)], No. 17973/67. Heading H1K. A radiation detector includes a thermal sink 22, Fig. 3, with a film of thermally conductive but electrically insulating material 24 spanning a cavity 23 in the sink with a collector body 26 of electrically conductive material-which in use will be heated by the detected radiationon the film overlying the cavity, this body also serving as the junction bridge of a thermocouple consisting of thermoelectric members 28, 30, each of which is physically connected at one end to the body 26 and thermally coupled (through the film 24) to the sink at the other end. The junction may be covered by a radiation absorbing body 40. A single body 22 may carry a plurality of couples spanning a single cavity and the couples may be connected in series by linking member 28 of one couple to member 30 of the next by cold junctions 29 as shown in Fig. 2. At their cold ends the members 28, 30 may be covered by highly thermally conductive bodies 50 (Figs. 2A and 3A, not shown) to improve the thermal coupling to the sink. Preferred materials are: for the sink 22, copper or aluminium; for the film 24, aluminium oxide; for the radiation collector 26, gold or silver; for the thermoelectric members 28 and 30, antimony and bismuth; for the radiation absorbent body 40, a porous agglomeration of surface oxidized particles of bismuth; and for the thermal coupling members (50) at the cold junctions, gold or silver. The collector body 26 and thermoelectric members 28, 30 may be deposited by evaporation through photo-resist masks, and the oxidized bismuth coating 40 by vapour phase deposition of bismuth smoke derived by heating a bismuth source in a low pressure oxidizing atmosphere. |
