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Accelerated Gas Panel Leak Tester

IP.com Disclosure Number: IPCOM000082994D
Original Publication Date: 1975-Mar-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 3 page(s) / 38K

Publishing Venue

IBM

Related People

DiGugno, N: AUTHOR [+3]

Abstract

One of the problems associated with gas panels is that of long-term gas leakage due to failure of the panel seals, particularly about the edges of the panel, which render a panel unacceptable in terms of electrical characteristics. The sensitivity of the test is such, however, that minute leaks which would render a panel unacceptable over an extended period are not detected.

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Accelerated Gas Panel Leak Tester

One of the problems associated with gas panels is that of long-term gas leakage due to failure of the panel seals, particularly about the edges of the panel, which render a panel unacceptable in terms of electrical characteristics. The sensitivity of the test is such, however, that minute leaks which would render a panel unacceptable over an extended period are not detected.

A gas discharge display panel is fabricated with two glass plates, each plate having a conductor array overcoated with a dielectric formed thereon. The two plates are then sealed about their edges, usually with a glass seal which is reflowed during an oven cycle. A tubulation member is provided each panel, for pumping down and back filling the panel with the appropriate gas mixture and pressure.

Conventionally, gas panels are initially tested for leaks immediately after fabrication, and then stored for extended periods before retesting. Testing apparatus which significantly reduces the time required to detect minute leaks operates as follows.

Conventional gas panels are operated at a pressure below atmospheric such that when leaks develop, atmospheric nitrogen is drawn into the panel due to the pressure differential, and is then detected by emission spectroscopy. One method of increasing the rate of nitrogen leakage into a panel is to increase the pressure of the external air or nitrogen around the panel, the limit to which the pressure can be increased being determined by gas panel flexure and eventual breakage. The testing apparatus provides higher pressure in the edge seal region without causing panel breakage, through use of a fixture is shown in the drawings.

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