Non-invasive pressure measuring device and method

Details Non-invasive pressure measuring device and method Non-invasive pressure measuring device and method

1990-11-30

1992-05-26

Williams, Hezron E.

Measuring and testing

Testing sealed receptacle

73705, 324460, G01M 340

Patent

active

051156687

ABSTRACT:
A low pressure, low energy measuring device for indirectly and non-invasiy measuring the pressure of a gaseous medium in a sealed system, such as gas discharge lamp, is disclosed. The measuring device and method measures the luminance of an externally-induced, high-frequency glow discharge of a gas in the lamp by non-invasive means. Comparison of the measured luminance with calibrated luminance vs. pressure data provides the pressure for the gas. In one embodiment, the components of the measuring device form a stand-alone unit useful for testing multiple sealed systems. In another embodiment, certain components of the device are integrated into the lamp's discharge system to facilitate measurement in the field. A separate peripheral unit is required with this latter embodiment.

REFERENCES:
patent: 2370475 (1945-02-01), Lemmers
patent: 2725525 (1955-11-01), Rively et al.
patent: 4147431 (1979-04-01), Mann
patent: 4452071 (1984-06-01), Eesley et al.
patent: 4939926 (1990-07-01), Welch

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