Patent ID: 7322248
Filing Date: 2008-01-29
Classification: G01L

Abstract:
1. A vacuum gauge of the Pirani type for measuring the pressure of vaporized organic or inorganic material used in forming a layer of a device, comprising: a) an extended filament having a thickness of 5 microns or less and having a temperature coefficient of resistance greater than 0.0035/° C., the filament being subject to the vaporized organic or inorganic material; b) means for applying a current to the filament so that the temperature of the filament is less than 650° C. so as not to degrade the molecular structure of the organic material; and c) means responsive to a change in resistance or a change in current to determine heat loss from the filament, which is a function of the pressure of the vaporized organic or inorganic material.