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A Coin-Sized Oxygen Laser Sensor Based on Tunable Diode Laser Absorption Spectroscopy Combining a Toroidal Absorption
Minxia Mao1, Ting Gong1, Kangjie Yuan1
1Shanxi Engineering Research Center of Precision Measurement and Online Detection Equipment, Shanxi Center of Technology Innovation for Light Manipulations and Applications, School of Applied Science, Taiyuan University of Science and Technology, Taiyuan 030024, China.
Sensors (Basel, Switzerland)
|October 14, 2023
Summary
A compact, coin-sized oxygen sensor was developed for aerospace applications. This tunable diode laser absorption spectroscopy sensor offers high sensitivity and stability for continuous atmospheric monitoring.
Area of Science:
- Aerospace Engineering
- Optical Sensing
- Spectroscopy
Background:
- Laser gas sensors are crucial for aerospace, demanding compact and lightweight designs.
- Existing sensors often face limitations in size and weight for space applications.
Purpose of the Study:
- To develop a coin-sized oxygen (O2) sensor for aerospace applications.
- To enhance sensor sensitivity and robustness using advanced spectroscopic techniques.
Main Methods:
- Designed a compact toroidal absorption cell integrating a vertical-cavity surface-emitting laser (VCSEL) and photodetector.
- Employed Tunable Diode Laser Absorption Spectroscopy (TDLAS) targeting the O2 spectral line at 763 nm.
- Utilized Wavelength Modulation Spectroscopy (WMS) to improve measurement sensitivity and robustness.
Main Results:
- Achieved a sensor size of 90 × 40 × 20 mm and weight of 75.16 g.
- Demonstrated a high linear correlation coefficient of 0.9994.
- Attained a minimum detection limit of 0.06% for oxygen concentration with Allen variance analysis.
- Validated pressure-dependent relationships and confirmed sensor stability over 24-hour continuous atmospheric monitoring.
Conclusions:
- Successfully developed a compact, lightweight laser-based oxygen sensor.
- The sensor exhibits high sensitivity, robustness, and stability for continuous monitoring.
- Potential applications include manned spaceflight scenarios requiring reliable oxygen sensing.
