ES316219A1 - Radioactive source manometer (Machine-translation by Google Translate, not legally binding) - Google Patents

Abstract

Radioactive source manometer, used for the measurement of gaseous pressures ranging from atmospheric pressure to molecular vacuum and of the type comprising a single measuring chamber or ionization chamber, electrically conductive, in communication with an enclosure that is you want to measure the pressure and with a DC source, a plutonium reservoir that emits α particles that ionize the gas contained in this chamber, a grid in the form of a circular propeller electrically isolated from said chamber and constituting an ion collector, which is connected to an amplifier, characterized in that it comprises, on the one hand, a metallic wire coaxial of this grid and kept at the potential of the measuring chamber, thanks to which the current measured by the amplifier is proportional to the gaseous pressure that reigns in the measuring chamber even for pressures between 0.75.102 and 0.75.103 mm of mercury, and, on the other hand, a switch installed between the measuring chamber and the direct current source and serves to momentarily cancel the electric field in the measuring chamber, which allows regulating the amplifier so that the measured current the latter is proportional to the gaseous pressure that reigns in the measuring chamber, even for pressures between 0.75.10-4 and approximately 0.75 mm of mercury. River. (Machine-translation by Google Translate, not legally binding)