Dr. Arthur Flores

The principle of operation consists of the separation of the components of a gaseous mixture pulse injected into a moving stream of inert carrier gas by the action of adsorption-desorption phenomena on a solid surface or the partitioning phenomena at the surface of a solid surface which has been coated with a liquid. The components of the mixture are eluted in separate pulses in the carrier stream. They may be detected and measured in the order in which they are eluted by thermal conductivity detectors (100 ppm sensitivity) or detectors utilizing ionization (sensitivities to ppb levels). Sampling is discontinues

U.S. Department of Transportation

Glossary

Leroy L. Blackshear

The heat flux probe has been developed for measuring rapid fluctuations in fluid properties over a wide range of temperature. An internally cooled sensing element permits measurements in temperatures above the melting point of the materials used. Electrical compensating circuitry permits a low “effective” heat capacity to permit frequency responses in the kilocycle range under most operating conditions.

The instrument measures the rate of heat transfer between the environment and the internally cooled sensor. The method of measuring this heat transfer, and procedures for obtaining temperature from this information, are primary interest. Both steady-state and transient measurements are considered along with a discussion of the errors inherent in the system.

A. Murty Kanury

Starting with the Thompson/Cousins construction materials calorimeter work of 1959, several groups in this country have devised calorimeters to measure the thermo chemical response of materials exposed to fire.

Carr B. Neel

Test of the concept, which draws on research for Apollo, opens the way to considering retrofit systems and designing for new aircraft, where the protection system may involve little or no weight penalty.