Patent ID: 7741852
Filing Date: 2010-06-22
Classification: G01L,H01J

Abstract:
1. An ionization vacuum gauge, comprising: a vacuum vessel, an electron source which is disposed in the vacuum vessel to emit electrons, a grid which is provided in the vacuum vessel to oscillate the electrons emitted from the electron source and to ionize gas molecules by the electrons, an ion collector which is provided in the vacuum vessel to supplement the ionized gas molecules to convert to a current signal, and to measure a gas molecular density (pressure) from the obtained current intensity, and a first heating device which is provided in the ion collector to heat the ion collector, wherein the grid is formed of a metallic resistor, both ends of the grid are connected to two vacuum terminals, other ends of the two vacuum terminals are connected to a first power supply for heating the grid, and the grid has a second heating device capable of heating independently the grid by the first power supply.