Accession Number : ADA196706

Title :   Applications of the Optical Differential Thermal Analysis.

Descriptive Note : Final rept.,

Corporate Author : ARMY LAB COMMAND WATERTOWN MA MATERIAL TECHNOLOGY LAB

Personal Author(s) : Caslavsky, Jaroslav L

PDF Url : ADA196706

Report Date : May 1988

Pagination or Media Count : 15

Abstract : ODTA detects temperature contact less, hence, it expands the upper usable temperature limit of DTA up to 3600 C accordingly suitable for studies of systems where enthalpic changes occur at high temperatures. Application of the computer graphics for the evaluation of the ODTA curves is demonstrated on melting of Y2OO3.A12O3 and Ya13-GdA1O3 systems. Measurement errors occurring at temperatures above 1900 C are pointed out and possibilities for their elimination or at least diminution are discussed. Keywords: Thermal analysis, Optical method, Data acquisition, Sapphire melting, Mathematical differentiation, Electronic differentiation, Emissivity measurements, Color graphics. (MJM)

Descriptors :   *COMPUTER GRAPHICS, *DIFFERENTIAL THERMAL ANALYSIS, *GRAPHICS, *OPTICAL ANALYSIS, *THERMAL ANALYSIS, COLORS, DATA ACQUISITION, EMISSIVITY, ERRORS, HIGH TEMPERATURE, LIMITATIONS, MEASUREMENT, MELTING, OPTICAL PROPERTIES, SAPPHIRE, TEMPERATURE

Subject Categories : Thermodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE