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Photoconductive Coupled Gas Cell

IP.com Disclosure Number: IPCOM000092256D
Original Publication Date: 1968-Nov-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 41K

Publishing Venue

IBM

Related People

Lay, FM: AUTHOR

Abstract

This gas cell structure utilizes photoconductor characteristics as the storage medium. The cell, having upper and lower glass layers 3 and 5, is divided into two sections 1 and 2 by a thin layer of glass 7 and transparent conductor 8. The cell is one of many in a honeycomb panel having walls 4 and 6. Upper section 1 is a conventional plasma discharge cell which is fired by coincident voltages applied to electrodes 9 and 11, which in a panel configuration are coordinate conductors. A thin layer of insulating material such as glass is applied over the inner surface of electrode 10 to prevent aging caused by cell firing. Section 2, having interior walls 13 composed of photoconductive material, is optically coupled through thin glass insulator wall 7 and transparent conductor 8 to section 1.

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Photoconductive Coupled Gas Cell

This gas cell structure utilizes photoconductor characteristics as the storage medium. The cell, having upper and lower glass layers 3 and 5, is divided into two sections 1 and 2 by a thin layer of glass 7 and transparent conductor 8. The cell is one of many in a honeycomb panel having walls 4 and 6. Upper section 1 is a conventional plasma discharge cell which is fired by coincident voltages applied to electrodes 9 and 11, which in a panel configuration are coordinate conductors. A thin layer of insulating material such as glass is applied over the inner surface of electrode 10 to prevent aging caused by cell firing. Section 2, having interior walls 13 composed of photoconductive material, is optically coupled through thin glass insulator wall 7 and transparent conductor 8 to section
1. When the latter is fired, the light resulting from the discharge lowers the impedance of photoconductor material 13 in section 2. In the equivalent circuit shown on the right, capacitor C(1) represents the capacity of gas tube 1, C(IN) the capacity of glass insulator 7, and C(2) the capacity of the gas in photoconductive section 2. The corresponding voltages V(1), V(IN) and V(2) are also shown in the equivalent circuit. The resistance part of the impedance in section 2 is represented by variable resistor R(PC) which also includes some stray capacity. Before firing, the impedance of R(PC) is much larger than that of C(2) sections 1 and 2 fire at a...