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

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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]
Copyright of Optical Fiber Technology is the property of Academic Press Inc. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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DbLabel: Engineering Source
An: 176539798
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  Data: Fast response multi-segment anti-resonant hollow-core fiber methane sensor at 1687 nm.
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  Data: <searchLink fieldCode="JN" term="%22Optical+Fiber+Technology%22">Optical Fiber Technology</searchLink>. May2024, Vol. 84, pN.PAG-N.PAG. 1p.
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  Data: <searchLink fieldCode="DE" term="%22Gas+detectors%22">Gas detectors</searchLink><br /><searchLink fieldCode="DE" term="%22Optical+fiber+detectors%22">Optical fiber detectors</searchLink><br /><searchLink fieldCode="DE" term="%22Fiber+optical+sensors%22">Fiber optical sensors</searchLink><br /><searchLink fieldCode="DE" term="%22Gas+lasers%22">Gas lasers</searchLink><br /><searchLink fieldCode="DE" term="%22Laser+spectroscopy%22">Laser spectroscopy</searchLink><br /><searchLink fieldCode="DE" term="%22Fiber+lasers%22">Fiber lasers</searchLink>
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  Label: Abstract
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  Data: • 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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  Data: <i>Copyright of Optical Fiber Technology is the property of Academic Press Inc. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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      – Type: doi
        Value: 10.1016/j.yofte.2024.103744
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      – Code: eng
        Text: English
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        Type: general
      – SubjectFull: Optical fiber detectors
        Type: general
      – SubjectFull: Fiber optical sensors
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      – SubjectFull: Gas lasers
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      – SubjectFull: Laser spectroscopy
        Type: general
      – SubjectFull: Fiber lasers
        Type: general
    Titles:
      – TitleFull: Fast response multi-segment anti-resonant hollow-core fiber methane sensor at 1687 nm.
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            NameFull: Gomółka, Grzegorz
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            NameFull: Filipkowski, Adam
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            NameFull: Nikodem, Michał
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            – D: 01
              M: 05
              Text: May2024
              Type: published
              Y: 2024
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              Value: 84
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