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Fast response multi-segment anti-resonant hollow-core fiber methane sensor at 1687 nm.

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Bibliographic Details
Title: Fast response multi-segment anti-resonant hollow-core fiber methane sensor at 1687 nm.
Authors: Gomółka, Grzegorz1 (AUTHOR) grzegorz.gomolka@pwr.edu.pl, Filipkowski, Adam2 (AUTHOR), Pysz, Dariusz2 (AUTHOR), Buczyński, Ryszard2,3 (AUTHOR), Nikodem, Michał1 (AUTHOR)
Source: Optical Fiber Technology. May2024, Vol. 84, pN.PAG-N.PAG. 1p.
Subjects: Gas detectors, Optical fiber detectors, Fiber optical sensors, Gas lasers, Laser spectroscopy, Fiber lasers
Abstract: • A new design of fast-response multi-segment hollow-core fiber gas cell for laser spectroscopy is demonstrated. • The setup utilizes 1.35-m-long hollow-core fiber segments arranged in series which are simultaneously filled with gas. • Direct absorption spectroscopy of methane at 1687 nm is used for setup characterization. Its pros and cons are discussed. • The pressure buildup and drawdown times are identified as a critical factor limiting the total response time the sensor. Typically, hollow-core fiber (HCF)-based laser gas sensing systems use a single monolithic fiber as a gas cell. This results in a tradeoff between sensitivity which requires long optical fiber and sensor's response time, that grows with the fiber length. Here we present a simple approach to solve this issue with new all-fiber modular gas cell design. The setup uses modified fiber mating sleeves to connect multiple HCFs in series, with optical loss of typically from 2 to 3 dB per connection. By injecting the sample gas at every second HCF-to-HCF connection, all HCF segments are filled simultaneously. We demonstrated the setups with two and four HCF segments, each with a length of 1.35 m. Laser absorption spectroscopy of methane near 1687 nm is used for setup characterization. Using the inlet pressure of 2 bar, the gas filling time is reduced over 13 times, from 77.9 s for a monolithic fiber, to only 5.9 s for the four-segment design (total HCF length of 5.4 m). With the pressure increased to 3 bar, the response time is further decreased to 3.6 s. Pressure buildup and drawdown times in the HCF were also examined. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:• A new design of fast-response multi-segment hollow-core fiber gas cell for laser spectroscopy is demonstrated. • The setup utilizes 1.35-m-long hollow-core fiber segments arranged in series which are simultaneously filled with gas. • Direct absorption spectroscopy of methane at 1687 nm is used for setup characterization. Its pros and cons are discussed. • The pressure buildup and drawdown times are identified as a critical factor limiting the total response time the sensor. Typically, hollow-core fiber (HCF)-based laser gas sensing systems use a single monolithic fiber as a gas cell. This results in a tradeoff between sensitivity which requires long optical fiber and sensor's response time, that grows with the fiber length. Here we present a simple approach to solve this issue with new all-fiber modular gas cell design. The setup uses modified fiber mating sleeves to connect multiple HCFs in series, with optical loss of typically from 2 to 3 dB per connection. By injecting the sample gas at every second HCF-to-HCF connection, all HCF segments are filled simultaneously. We demonstrated the setups with two and four HCF segments, each with a length of 1.35 m. Laser absorption spectroscopy of methane near 1687 nm is used for setup characterization. Using the inlet pressure of 2 bar, the gas filling time is reduced over 13 times, from 77.9 s for a monolithic fiber, to only 5.9 s for the four-segment design (total HCF length of 5.4 m). With the pressure increased to 3 bar, the response time is further decreased to 3.6 s. Pressure buildup and drawdown times in the HCF were also examined. [ABSTRACT FROM AUTHOR]
ISSN:10685200
DOI:10.1016/j.yofte.2024.103744