EXPERIMENTAL INVESTIGATION OF THE NONUNIFORM HEATING EFFECT IN LASER FLASH THERMAL-DIFFUSIVITY MEASUREMENTS

被引：26

作者：

BABA, T

KOBAYASHI, M

ONO, A

HONG, JH

SULIYANTI, MM

机构：

[1] NATL IND TECHNOL INST,KYUNGGI,SOUTH KOREA

[2] INDONESIAN INST SCI,TANGERANG 15310,INDONESIA

来源：

THERMOCHIMICA ACTA | 1993年 / 218卷

关键词：

THERMAL DIFFUSIVITY; EXPERIMENTAL; SOLID MATERIALS; LASER FLASH METHOD; NONUNIFORM HEATING EFFECT;

D O I：

10.1016/0040-6031(93)80433-B

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Nonuniform heating effects of laser flash thermal diffusivity measurements were experimentally investigated. Spatial profiles of pulsed laser beams were monitored using a TV camera system. Direct laser beams from a Nd-glass laser were irregular because of multi-mode oscillation. Nonuniform heating error of larger than 5% was observed when thermal diffusivity of a disk shaped specimen of POCO AXM-5Q1 graphite was measured under irradiation by this irregular direct beam. A new technique was established to convert irregular direct beams into spatially uniform beams by using a step index optical fiber of large core diameter. The nonuniform heating error was reduced to the order of 1% when the specimen was irradiated by this uniform beam.

引用

页码：329 / 339

页数：11

共 11 条

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Arai T., 1987, High Temperatures - High Pressures, V19, P269

[2]

AZUMI T, 1981, 2ND P JPN S THERM PR, P19

[3] LASER-BEAM PROFILE MEASUREMENT BY A THERMOGRAPHIC TECHNIQUE [J].