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Hostile Environment Testing System

IP.com Disclosure Number: IPCOM000088625D
Original Publication Date: 1977-Jul-01
Included in the Prior Art Database: 2005-Mar-04
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Angelo, RW: AUTHOR [+4]

Abstract

Environmental chambers with controlled concentrations of pollutant gases are necessary to evaluate the response of electronic materials, components and packages to hostile environments. The design, construction and operation of these chambers presents many problems. Pollutant gases must be accurately diluted and quantitatively introduced into the chamber. Temperature and humidity must be generated and accurately controlled. Since the pollutants are corrosive and toxic, materials and methods must be selected to assure safety and longevity.

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Hostile Environment Testing System

Environmental chambers with controlled concentrations of pollutant gases are necessary to evaluate the response of electronic materials, components and packages to hostile environments. The design, construction and operation of these chambers presents many problems. Pollutant gases must be accurately diluted and quantitatively introduced into the chamber. Temperature and humidity must be generated and accurately controlled. Since the pollutants are corrosive and toxic, materials and methods must be selected to assure safety and longevity.

Various designs for environmental chambers have been used. A common technique uses an inner chamber in a temperature humidity cabinet. A partial vacuum is then applied to the inner chamber, and humid air is pulled through a poppet valve into the inner chamber. Since the amount of air pulled into the inner chamber cannot be measured directly, it is necessary to determine this important quantity by difference between air intake and air emitted. However, before emitted air can be measured, it is necessary to condense out the quantity of water previously introduced to attain the required humidity.

The concentrations of the various pollutants in the hostile environment chambers are also important parameters. Periodic analysis of the contents of supply cylinders has shown significant deviations from nominal concentrations in addition to changes in concentration over time. Hence, some method for frequ...