Abstract
A highly sensitive and temperature-compensated methane sensor based on a liquid-infiltrated photonic crystal fiber (PCF) is proposed. Two bigger holes near the core area are coated with a methane-sensitive compound film, and specific cladding air holes are infiltrated into the liquid material to form new defective channels. The proposed sensor can achieve accurate measurement of methane concentration through temperature compensation. The sensitivity can reach to 20.07 nm/% with a high linearity as the methane concentration is within the range of 0%–3.5% by volume. The proposed methane sensor can not only improve the measurement accuracy, but also reduce the metrical difficulty and simplify the process.
Highlights
Photonic crystal fiber (PCF) [1,2,3] becomes a great sensing platform due to its special light controlling capability and excellent sensing abilities
With the promotion of fabrication techniques, various PCF-based sensors have been developed for different measurements [4, 5]
The methane concentration sensitivity can be up to 20.07 nm/% with a good linearity of 0.99999, which is an excellent candidate for gas monitoring
Summary
Photonic crystal fiber (PCF) [1,2,3] becomes a great sensing platform due to its special light controlling capability and excellent sensing abilities. Many methane-sensing structures have been proposed, including long period fiber grating (LPFG) [6,7,8], modal interference (MI) [9], surface plasmon resonance (SPR) [10], cryptophane-E infiltrated photonic crystal (PC) micro-cavity [11], and optical absorption spectroscopy technology [12]. These configurations have their own advantages, most of them are interference-sensitive to the methane concentration and to the temperature. The methane concentration sensitivity can be up to 20.07 nm/% with a good linearity of 0.99999, which is an excellent candidate for gas monitoring
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