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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 47, Iss. 27 — Sep. 20, 2008
  • pp: 4895–4899

Decay time characteristics of La 2 O 2 S Eu and La 2 O 2 S Tb for use within an optical sensor for human skin temperature measurement

Sook Voon Yap, Robert M. Ranson, Wayne M. Cranton, and Demosthenes Koutsogeorgis  »View Author Affiliations


Applied Optics, Vol. 47, Issue 27, pp. 4895-4899 (2008)
http://dx.doi.org/10.1364/AO.47.004895


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Abstract

We focus on the development of a remote temperature sensing technology, i.e., an optical laser-based sensor, using thermographic phosphors for medical applications, particularly within an electromagnetically hostile magnetic resonance imaging (MRI) environment. A MRI scanner uses a strong magnetic field and radio waves to generate images of the inside of the body. The quality of the image improves with increasing magnetic resonance; however, the drawback of applying a greater magnetic strength is the inducement of heat into the body tissue. Therefore, monitoring the patient’s temperature inside MRI is vital, but until now, a practical solution for temperature measurement did not exist. We show europium doped lanthanum oxysulphide ( La 2 O 2 S Eu ) and terbium doped lanthanum oxysulphide ( La 2 O 2 S Tb ) are both temperature sensitive to a low temperature range of 10 50 ° C when under ultraviolet (UV) excitation. The emission spectra and decay time characteristics of these phosphors were demonstrated. The results indicate that La 2 O 2 S Eu has a quenching rate of 13.7 m ° C 1 and 4 m ° C 1 at 512 nm and 538 nm , respectively. In addition, La 2 O 2 S Tb has a lower quenching rate of 4.19 m ° C 1 at 548 nm due to its faster decay time.

© 2008 Optical Society of America

OCIS Codes
(120.0120) Instrumentation, measurement, and metrology : Instrumentation, measurement, and metrology
(160.5690) Materials : Rare-earth-doped materials
(170.3650) Medical optics and biotechnology : Lifetime-based sensing
(250.5230) Optoelectronics : Photoluminescence
(300.2530) Spectroscopy : Fluorescence, laser-induced
(280.6780) Remote sensing and sensors : Temperature

ToC Category:
Remote Sensing and Sensors

History
Original Manuscript: October 31, 2007
Revised Manuscript: August 1, 2008
Manuscript Accepted: August 15, 2008
Published: September 15, 2008

Virtual Issues
Vol. 3, Iss. 11 Virtual Journal for Biomedical Optics

Citation
Sook Voon Yap, Robert M. Ranson, Wayne M. Cranton, and Demosthenes Koutsogeorgis, "Decay time characteristics of La2O2S:Eu and La2O2S:Tb for use within an optical sensor for human skin temperature measurement," Appl. Opt. 47, 4895-4899 (2008)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-47-27-4895


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References

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