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Thermosensation01:43

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Peripheral thermosensation is the perception of external temperature. A change in temperature (on the surface of the skin and other tissues) is detected by a family of temperature-sensitive ion channels called Transient Receptor Potential, or TRP, receptors. These receptors are located on free nerve endings. Those detecting cold temperatures are closer to the surface of the skin than the nerve endings detecting warmth. These thermoTRP channels, while temperature selective, have relatively...
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Hollow-waveguide-based light-induced thermoelastic spectroscopy sensing.

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    A novel hollow waveguide (HWG)-based light-induced thermoelastic spectroscopy (LITES) sensor offers sensitive gas detection. This HWG-LITES system achieves low minimum detection limits for acetylene and carbon monoxide.

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    Area of Science:

    • Spectroscopy
    • Optical Engineering
    • Environmental Science

    Background:

    • Gas sensing technologies are crucial for environmental monitoring and industrial safety.
    • Traditional methods like multi-pass cells (MPCs) and hollow-core anti-resonant fibers (HC-ARFs) have limitations in size, stability, and optical coupling.
    • There is a need for compact, stable, and efficient gas sensing platforms.

    Purpose of the Study:

    • To propose and demonstrate a novel gas sensing system utilizing a hollow waveguide (HWG) integrated with light-induced thermoelastic spectroscopy (LITES).
    • To evaluate the performance of the HWG-based LITES sensor for detecting acetylene (C2H2) and carbon monoxide (CO) in both near-infrared and mid-infrared regions.
    • To compare the advantages of the HWG platform against conventional gas sensing cells.

    Main Methods:

    • A 65 cm long HWG with a 4 mm inner diameter, coated with a silver film, was employed as the gas chamber and light transmission medium.
    • Two laser sources, a diode laser (1.53 µm) and a quantum cascade laser (4.58 µm), were used for excitation.
    • Light-induced thermoelastic spectroscopy (LITES) was performed by analyzing the thermoelastic response to laser absorption by the target gases.

    Main Results:

    • The HWG-based LITES sensor exhibited excellent linear responsiveness to varying concentrations of acetylene (C2H2) and carbon monoxide (CO).
    • The minimum detection limit (MDL) achieved was 6.07 ppm for C2H2 and 98.66 ppb for CO.
    • The HWG platform demonstrated advantages over MPCs and HC-ARFs, including smaller size, simpler structure, faster filling, easier optical coupling, and higher system stability.

    Conclusions:

    • The hollow waveguide (HWG) is a highly effective platform for light-induced thermoelastic spectroscopy (LITES) gas sensing.
    • The developed HWG-LITES sensor offers high sensitivity and linear response for detecting key gases like C2H2 and CO.
    • This technology presents a promising alternative to existing gas sensing methods due to its performance and practical advantages.