Gallium antimonide resistance thermometers

✍ Scribed by D.Kh. Amirkhanova

• Publisher: Elsevier Science
• Year: 1972
• Tongue: English
• Weight: 177 KB
• Volume: 12
• Category: Article
• ISSN: 0011-2275
• DOI: 10.1016/0011-2275(72)90093-8

✦ Synopsis

27, 67, and 49% respectively. As the calculations using (1) to ( ) take account only of the heat flux along the leads, the extra dissipation of heat in the dewar and connector distorts the assumed conditions.

The heat flux density across the lead-vapour interface does not exceed 4 mW cm "2. From Fig. the ratios of heat fluxes at zero and at optimum currents arc', 0.25 to 0.6, which agrees with the values of 0.5 to 0.7 given by Henning 8 for designs I and II only.

Conclusions

The specific heat flows along leads I and II are relatively less than along lead III, which confirms experimentally the advantage of a cross-section varying with length according to the relation determined. The absolute values of specific heat fluxes show that leads I and II are 1.2 to 2.1 times more economical than reference lead III. The large fraction of extraneous vapour, which cools the lead additionally along its height, makes a unique connexion between the experimental and calculated results difficult. In designing leads the recommendations come to a choice of the optimum cross-section as a function of length, which has a minimum in the central part of the lead.