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Real time frequency domain fibreoptic temperature sensor using ruby crystals

J R Alcala1, S C Liao, J Zheng

  • 1Department of Biomedical Engineering, Case Western Reserve University, Cleveland, OH 44106, USA.

Medical Engineering & Physics
|January 1, 1996
PubMed
Summary
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Ruby crystal phosphorescence lifetime accurately measures physiological temperature in real time. This optical fiber sensor achieves high precision for medical and research applications.

Area of Science:

  • Optoelectronics
  • Biomedical Sensing
  • Materials Science

Background:

  • Accurate real-time temperature monitoring is crucial for physiological applications.
  • Existing methods may have limitations in precision, speed, or invasiveness.
  • Ruby crystals offer unique luminescent properties suitable for sensing.

Purpose of the Study:

  • To develop and validate a non-invasive optical temperature sensor using ruby crystal phosphorescence.
  • To assess the sensor's performance in the physiological temperature range (15-45°C).
  • To achieve high precision and accuracy for real-time temperature measurements.

Main Methods:

  • Utilizing the excited state phosphorescence lifetime of a ruby crystal integrated with an optical fiber.
  • Excitation with a pulsed Ne-He laser and data acquisition using a sampler.

Related Experiment Videos

  • Employing frequency domain methods, including fast Fourier transform (FFT), for data analysis.
  • Measuring phase delay and modulation ratio of harmonics to compute sensor lifetime.

    • Main Results:

    • Real-time temperature monitoring with precision and accuracy better than 1°C in the physiological range.
    • Achieved a precision of 0.1°C with 3-minute integration times.
    • Demonstrated reproducible phosphorescence lifetimes to six parts in 1000.
    • Reported system drift of 3% over 5 hours and update times of 2.7 seconds.

    Conclusions:

    • The ruby crystal phosphorescence lifetime technique provides a precise and accurate method for real-time physiological temperature monitoring.
    • The optical fiber-based sensor is suitable for applications requiring non-invasive, high-fidelity temperature measurements.
    • The developed instrumentation and methods offer rapid response times and stable performance.