| 摘要 |
The present invention provides a fast and accurate method of measuring the vacuum pressure in a sealed glass vial or other electrically non-conductive vessel. In the method the vial or vessel to be tested is placed between a pair of electrodes. The gas contained within the vial or vessel is ionized by applying a high frequency, high voltage potential across the electrodes. The voltage is progressively decreased once ionization has occurred and the termination of ionization is detected by registering either the sudden drop in electrode current or the termination of light emission from the vial. The gas pressure within the vial or vessel is derived as a function of the electrode voltage at the point at which ionization terminates. |
