| 摘要 |
<p>954,634. Measuring thermal radiation. COPPERWELD STEEL CO. May 5, 1960 [May 25, 1959], No.15910/60. Heading G1A. [Also in Division G3] A workpiece 15 whose temperature is to be controlled is heated by an induction coil 32 energized from a generator 29, radiation from the workpiece being intercepted by a detector comprising a chopper 12 surface of which acts as a temperature reference source, a window 19 e.g. of arsenic trisulfide glass which is transparent to infra-red radiation between about one and ten microns, and a bolometer cell 16, supplied with D.C. from a power supply 22, which converts the signal received through the window 19 into an alternating voltage signal which is fed to an amplifier 20 the output of which is rectified by a doubler circuit 56 associated with a galvanometer 21 indicating the temperature of the workpiece 15. The output from the circuit 56 is fed to two magnetic amplifier stages 23, 24 and thence to a saturable reactor 25 which controls the D.C. supply to the field winding 30 of the generator 29; if the workpiece temperature varies, the resulting variation in field current changes the output of the generator and the heating action of the coil 32. The temperature of the workpiece 15 thus tends to remain constant.</p> |
