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Surface flaw detection by means of infrared radiometer. Part 3. ; Detection limit influenced by an environment temperature. Sekigai hoshakei ni yoru hyomen kekkan no kenshutsu. 3. ; Shuhen ondo ni yoru kenshutsu genkai no eikyo

Journal Article:

Abstract

Measuring a radiation energy distribution around surface flaw by means of a infrared rediometer can detect fine flaw on the surface. The characteristics were examined using a light quantum type radiation thermometer consisted of Hg-Cd-Te as a sensor. A surrounding wall consisted of a black body wall was installed between the sensor and test piece, and by thus maintaining the surrounding wall temperature constant, reflection energy from the test piece surface was maintained constant for stabilized measurement. The measurement values are the sum of energies from emission and reflection, or the so-called radiosity values. To avoid effects from the reflection to reduce variance in the emissivity, it is necessary to keep the surrounding wall temperatures lower by more than 20 {degree}C than the test piece radiation temperatures. Emissivity can be calculated from the rediositivity (sum of the radiation and the reflection), the surrounding wall temperatures, and the test piece radiation temperatures. If the surface is rough, variance in the measurements increases. The larger the difference in the test piece and surrounding wall temperatures, the thermo image of the defects on the test piece surface becomes more distinctive, thus the detection limit can be enhanced. 7 refs., 13 figs.
Authors:
Okamoto, U; Kaminaga, F; [1]  Ishii, T; [2]  Eto, M; Ooka, N; Kanaya, K; Eto, Y; [3]  Kurokawa, T [4] 
  1. Ibaraki University, Ibaraki (Japan). Faculty of Engineering
  2. Ibaraki University, Ibaraki (Japan)
  3. Japan Atomic Energy Research Institute, Ibaraki (Japan)
  4. Nippon Denki Sanei Ltd. Co., Tokyo (Japan)
Publication Date:
Dec 20, 1990
Product Type:
Journal Article
Reference Number:
NEDO-91-930116; EDB-91-134944
Resource Relation:
Journal Name: Ibaraki Daigaku Kogakubu Kenkyu Shuho (Journal of the Faculty of Engineering, Ibaraki University); (Japan); Journal Volume: 39
Subject:
42 ENGINEERING; 47 OTHER INSTRUMENTATION; DEFECTS; DETECTION; EMISSIVITY; INFRARED THERMOGRAPHY; AMBIENT TEMPERATURE; BLACKBODY RADIATION; ENERGY; FLUCTUATIONS; REFLECTION; SURFACES; ROUGHNESS; ELECTROMAGNETIC RADIATION; MEASURING METHODS; OPTICAL PROPERTIES; PHYSICAL PROPERTIES; RADIATIONS; SURFACE PROPERTIES; THERMOGRAPHY; VARIATIONS; 420500* - Engineering- Materials Testing; 440500 - Thermal Instrumentation- (1990-)
OSTI ID:
5276387
Country of Origin:
Japan
Language:
Japanese
Other Identifying Numbers:
Journal ID: ISSN 0367-7389; CODEN: IDKSA
Submitting Site:
NEDO
Size:
Pages: 197-203
Announcement Date:

Journal Article:

Citation Formats

Okamoto, U, Kaminaga, F, Ishii, T, Eto, M, Ooka, N, Kanaya, K, Eto, Y, and Kurokawa, T. Surface flaw detection by means of infrared radiometer. Part 3. ; Detection limit influenced by an environment temperature. Sekigai hoshakei ni yoru hyomen kekkan no kenshutsu. 3. ; Shuhen ondo ni yoru kenshutsu genkai no eikyo. Japan: N. p., 1990. Web.
Okamoto, U, Kaminaga, F, Ishii, T, Eto, M, Ooka, N, Kanaya, K, Eto, Y, & Kurokawa, T. Surface flaw detection by means of infrared radiometer. Part 3. ; Detection limit influenced by an environment temperature. Sekigai hoshakei ni yoru hyomen kekkan no kenshutsu. 3. ; Shuhen ondo ni yoru kenshutsu genkai no eikyo. Japan.
Okamoto, U, Kaminaga, F, Ishii, T, Eto, M, Ooka, N, Kanaya, K, Eto, Y, and Kurokawa, T. 1990. "Surface flaw detection by means of infrared radiometer. Part 3. ; Detection limit influenced by an environment temperature. Sekigai hoshakei ni yoru hyomen kekkan no kenshutsu. 3. ; Shuhen ondo ni yoru kenshutsu genkai no eikyo." Japan.
@misc{etde_5276387,
title = {Surface flaw detection by means of infrared radiometer. Part 3. ; Detection limit influenced by an environment temperature. Sekigai hoshakei ni yoru hyomen kekkan no kenshutsu. 3. ; Shuhen ondo ni yoru kenshutsu genkai no eikyo}
author = {Okamoto, U, Kaminaga, F, Ishii, T, Eto, M, Ooka, N, Kanaya, K, Eto, Y, and Kurokawa, T}
abstractNote = {Measuring a radiation energy distribution around surface flaw by means of a infrared rediometer can detect fine flaw on the surface. The characteristics were examined using a light quantum type radiation thermometer consisted of Hg-Cd-Te as a sensor. A surrounding wall consisted of a black body wall was installed between the sensor and test piece, and by thus maintaining the surrounding wall temperature constant, reflection energy from the test piece surface was maintained constant for stabilized measurement. The measurement values are the sum of energies from emission and reflection, or the so-called radiosity values. To avoid effects from the reflection to reduce variance in the emissivity, it is necessary to keep the surrounding wall temperatures lower by more than 20 {degree}C than the test piece radiation temperatures. Emissivity can be calculated from the rediositivity (sum of the radiation and the reflection), the surrounding wall temperatures, and the test piece radiation temperatures. If the surface is rough, variance in the measurements increases. The larger the difference in the test piece and surrounding wall temperatures, the thermo image of the defects on the test piece surface becomes more distinctive, thus the detection limit can be enhanced. 7 refs., 13 figs.}
journal = {Ibaraki Daigaku Kogakubu Kenkyu Shuho (Journal of the Faculty of Engineering, Ibaraki University); (Japan)}
volume = {39}
journal type = {AC}
place = {Japan}
year = {1990}
month = {Dec}
}