Abstract
Pulsed photothermal interferometry (PTI) gas sensor with hollow-core photonic bandgap fibre (HC-PBF) is demonstrated with a Sagnac interferometer-based phase detection system. Under the condition of constant peak pump power, the optimal pulse duration is found to be > 1:2 μs for detecting low-concentration of trace gases in nitrogen, limited by thermal conduction of gases within the hollow-core. Preliminary experiments with a 0.62-mlong HC-PBF gas cell, low peak power (∼ 20:2mW) and a boxcar averager with 10k average times demonstrated a detection limit of 3:3 p:p:m acetylene. Detection limit down to ppb or lower is expected with high peak power pump pulses.
Original language | English |
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Title of host publication | 25th International Conference on Optical Fiber Sensors |
Publisher | SPIE |
Volume | 10323 |
ISBN (Electronic) | 9781510610910 |
DOIs | |
Publication status | Published - 1 Jan 2017 |
Event | 25th International Conference on Optical Fiber Sensors, OFS 2017 - Jeju, Korea, Republic of Duration: 24 Apr 2017 → 28 Apr 2017 |
Conference
Conference | 25th International Conference on Optical Fiber Sensors, OFS 2017 |
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Country/Territory | Korea, Republic of |
City | Jeju |
Period | 24/04/17 → 28/04/17 |
Keywords
- Optical fibre sensor, photothermal interferometry, gas sensor, photonic crystal fibre, spectroscopy
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Computer Science Applications
- Applied Mathematics
- Electrical and Electronic Engineering