. Instruments and methods used in radiometry - II . END WIRING DIAGRAM Fig. 4 Using bismuth wire mm in diameter, the galvanometerdeflection for a receiver 4 mm long was times as large as thatfor a receiver 1 mm long. On reducing the length of the 4 mmreceiver to about mm, the sensitivity was times as great asfor the receiver 1 mm in length. A receiver 9 mm long was as sensitive as a receiver 1 mm in length. As shown in , the sensitivity varies roughly as the square root of the receivingsurface, which is the law of the surface bolometer. As a matter of 24 Bulletin
. Instruments and methods used in radiometry - II . END WIRING DIAGRAM Fig. 4 Using bismuth wire mm in diameter, the galvanometerdeflection for a receiver 4 mm long was times as large as thatfor a receiver 1 mm long. On reducing the length of the 4 mmreceiver to about mm, the sensitivity was times as great asfor the receiver 1 mm in length. A receiver 9 mm long was as sensitive as a receiver 1 mm in length. As shown in , the sensitivity varies roughly as the square root of the receivingsurface, which is the law of the surface bolometer. As a matter of 24 Bulletin of the Bureau of Standards [Vol. 9 fact, there is an optimum length, which is of the order of 2 mm,but the exact value was not determined. Obviously, two receiv-ing surfaces 4 mm wide are better than a single one 9 mm widein the ratio to In fact, the sensitivity should be stillgreater than this (if a galvanometer having a resistance of thesame magnitude be provided), for by placing the two units (4 mmwide) in parallel, the internal resis
Size: 2125px × 1176px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, bookidinstrum97631, bookyear1913
