Patent ID: 7385703
Filing Date: 2008-06-10
Classification: G01L

Abstract:
1. A method of determining, by means of absorption spectroscopy, the pressure of a gas or gas mixture in a vacuum container located in an environment that also contains the gas to be measured, wherein the pressure of the gas is different from that in the vacuum container, comprising a laser and a laser detector, the absorption curve A R (λ) of the gas to be determined being determined in the beam path between laser and detector in a first step, the vacuum container being placed into the beam path and the absorption curve A M (λ) of the gas to be determined being determined in the beam path into which the vacuum container has been placed in a second step, that the absorption curve A R (λ) is made to coincide by compression with the absorption curve A M (λ) outside of the absorption curve of the gas to be measured, the extent of compression being determined by a proportionality factor c, the following relation applying for determining the gas to be measured in the vacuum container: A G (λ)= A M (λ)− c·A R (λ).