Cavity ring fiber chemical sensors
In recent years, optical fiber chemical sensors are paid increasing attentions due to their electrical passivity, remote sensing potentials and miniaturization feasibility, relying on the specific properties of the optical fibers. Highly sensitive spectroscopic techniques are highly demande...
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| Format: | Theses and Dissertations |
| Language: | English |
| Published: |
2010
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/41730 |
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| Institution: | Nanyang Technological University |
| Language: | English |
| Summary: | In recent years, optical fiber chemical sensors are paid increasing attentions due to
their electrical passivity, remote sensing potentials and miniaturization feasibility,
relying on the specific properties of the optical fibers. Highly sensitive spectroscopic
techniques are highly demanded for enhancing the sensitivities of the optical fiber
chemical sensors. This thesis mainly reports optical fiber cavity ring-down (CRD) and
cavity ring-up (CRU) based-sensors for chemical sensing and other applications.
The thesis begins with a comprehensive survey on the existing types and
spectroscopic techniques for optical fiber chemical sensors. Following that, direct
absorption spectroscopy, which is the most commonly used spectroscopic technique,
is studied. The direct absorption spectroscopy-based optical fiber chemical sensors
are analyzed· based on a practical setup. Aiming at reducing the effects of the main
noises in this kind of sensor, a digital finite impulse response (FIR) filter is designed
to improve this chemical sensor's sensitivity. The simulation and experimental results
have shown that the detection accuracy is enhanced by this digital signal processing
(DSP) technique. |
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