Total and Partial Pressure Measurement in Vacuum Systems by J. H. Leck (auth.)

By J. H. Leck (auth.)

This publication offers with the underlying idea and useful elements of strain gauges which are at this time in most cases use. a result of ever-increasing calls for to supply a much broader variety of subtle and trustworthy vacuum gear a great figuring out of those tools is of significant significance to all staff within the examine and business sectors. Of the gauges thought of basically the mechanical kinds are absolute, within the experience that they degree strain without delay as a strength upon a liquid column or a high-quality floor. less than excellent stipulations it's attainable to calculate their sensitiv­ ities, that are a similar for all gases and vapours. the hot advancements within the viscous or molecular damping gauges point out that those can also be thought of absolute. different gauges are oblique in that they contain the dimension of a few secondary phenomenon that is pressure-dependent and for that reason those gauges can simply be used for size after calibration opposed to an absolute usual. The radiometer or Knudsen kind gauge has been excluded from the textual content due to the fact that those are actually basically of historical curiosity. additionally no point out is made from the mixing strategies concerning floor adjustments (such as paintings functionality) even supposing those may have program less than very distinct conditions. The McLeod gauge is handled in a few aspect, for even supposing this gauge has few useful purposes, it's the so much delicate absolute gauge to be had and has price as a reference standard.

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350 A respectively. 045 mm in diameter and for a gas temperature O°c. THERMAL CONDUCTIVITY GAUGES 51 of the gauge may be expected to be more or less inversely proportional to length when I < 10 mm. This effect has been demonstrated experimentally by Leck and Martin 17 . Their results show very clearly the advantage to be gained by decreasing I. For any given bridge voltage the power supplied to the wire changes as the pressure changes (the wire can be considered as a variable load fed from a voltage source of internal impedance R1)' If Rw» R 1, then the power supplied to the wire increases as Rw falls, but if R1 »R w, the power decreases as Rw falls.

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