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Self-Adaptive Polymer Fabry-Pérot Thermometer for High-Sensitivity and Wide-Linear-Range Sensing
Yifan Cheng1, Maolin Yu1, Junjie Liu1
1School of Electronic Science and Engineering, Xiamen University, Xiamen 361005, China.
Biosensors
|September 26, 2025
Summary
A novel polymer Fabry-Pérot interferometer (PFPI) sensor offers ultrasensitive temperature detection with a two-orders-of-magnitude improvement over traditional fiber Bragg gratings. This advancement enables high-resolution thermal imaging and precise non-invasive physiological monitoring.
Area of Science:
- Optics and Photonics
- Sensor Technology
- Biomedical Engineering
Background:
- Fiber-optic sensors are increasingly vital due to their simplicity, cost-effectiveness, and high sensitivity.
- Existing fiber-optic temperature sensors face limitations in sensitivity and range, hindering applications requiring high resolution or broad thermal coverage.
Purpose of the Study:
- To develop a self-adaptive polymer Fabry-Pérot interferometer (PFPI) sensor for ultrasensitive and wide-linear-range thermal sensing.
- To enhance temperature sensing capabilities beyond conventional fiber Bragg gratings.
- To enable high-resolution thermal field imaging and non-invasive physiological monitoring.
Main Methods:
- Fabrication of a self-adaptive polymer Fabry-Pérot interferometer (PFPI) sensor.
- Characterization of temperature sensitivity, achieving 0.95 nm/°C.
- Implementation of a local cross-correlation algorithm for accurate wavelength tracking to manage spectral shifts.
- Demonstration of ultrahigh-resolution thermal field imaging (0.025 °C resolution).
- Application in non-invasive human physiological monitoring (body temperature and respiratory rate).
Main Results:
- Achieved a temperature sensitivity of 0.95 nm/°C, two orders of magnitude higher than conventional fiber Bragg gratings.
- Successfully addressed spectral shifts exceeding the free spectral range using a cross-correlation algorithm.
- Demonstrated ultrahigh-resolution (0.025 °C) scanning thermal field imaging.
- Enabled precise detection of human body temperature and respiratory rate for physiological monitoring.
Conclusions:
- The proposed PFPI sensor provides a significant advancement in ultrasensitive and wide-linear-range thermal sensing.
- The developed sensor is capable of both microscopic thermal mapping and non-invasive healthcare applications.
- This technology holds promise for improved diagnostic tools and thermal imaging systems.
Related Concept Videos
01:13Equipments Used to Measure Body Temperature
Body temperature can be assessed using various devices and measured in Celsius or Fahrenheit.
Glass-bulb Thermometer:
Glass-bulb thermometers are hollow glass tubes with a bulb tip containing liquid such as ethanol or mercury. Historically, glass bulb mercury thermometers were the standard device to measure body temperature. Today, mercury thermometers are prohibited in many countries due to the hazardous effects of mercury and the risk of exposure if the glass bulb breaks. In general,...
Glass-bulb Thermometer:
Glass-bulb thermometers are hollow glass tubes with a bulb tip containing liquid such as ethanol or mercury. Historically, glass bulb mercury thermometers were the standard device to measure body temperature. Today, mercury thermometers are prohibited in many countries due to the hazardous effects of mercury and the risk of exposure if the glass bulb breaks. In general,...
01:14Temperature Measurement Sites
A thermometer measures body temperature. The common sites for measuring body temperature are the oral cavity, axillary region, temporal artery, and skin surface, such as the forehead, abdomen, and axilla. True core body temperature is assessed in the rectum, tympanic membrane, pulmonary artery, esophagus, and urinary bladder.
Oral: When assessing oral temperature, the thermometer tip should be placed under the tongue in the posterior sublingual pocket. It offers accurate readings and can be...
Oral: When assessing oral temperature, the thermometer tip should be placed under the tongue in the posterior sublingual pocket. It offers accurate readings and can be...