Luminescence Thermography with Memory Effect Based on the Emission of Chromium Impurities in Electron-Irradiated Al2O3-Ceramics
Abstract:We report on the demonstration of a new method of thermographic imaging with memory function for sintered Al2O3-ceramics, which is based on the reversible change of the luminescence intensity of the spectral lines at 692.9 nm and 694.3 nm. The intensity of these so-called R-lines, which are attributed to Cr3+-ions in aluminum oxide, is reduced by initial electron-beam irradiation of the ceramic. After subsequent heat exposure, the luminescence intensity recovers permanently again, whereby the amount of increase depends on the temperature and on the duration of the heating process. We show that in the case of a heating time of five minutes, maximum temperatures in the range between 200 °C and 350 °C can be measured after the exposure. The sensitive temperature range can be shifted by adjusting the heating time. Due to the fact that Cr3+ is present in sufficient concentration in commercially available aluminum oxide ceramic products, the sensor function can be introduced by electron irradiation as an intrinsic property of almost any ceramic component. Possible applications and specific advantages in particular with respect to the memory effect are discussed.
Document Type: Research Article
Publication date: December 1, 2006
More about this publication?
- The growing interest and activity in the field of sensor technologies requires a forum for rapid dissemination of important results: Sensor Letters is that forum. Sensor Letters offers scientists, engineers and medical experts timely, peer-reviewed research on sensor science and technology of the highest quality. Sensor Letters publish original rapid communications, full papers and timely state-of-the-art reviews encompassing the fundamental and applied research on sensor science and technology in all fields of science, engineering, and medicine. Highest priority will be given to short communications reporting important new scientific and technological findings.
- Editorial Board
- Information for Authors
- Subscribe to this Title
- Terms & Conditions
- Ingenta Connect is not responsible for the content or availability of external websites