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Pressure-dependent diffraction spectrum response in photopolymer-based holographic sensor.

Xinying Jiao, Hongpeng Liu, Baohua Wang

    Applied Optics
    |November 2, 2019
    PubMed
    Summary

    This study presents a novel holographic pressure sensor using photopolymer. The transmission-based sensor demonstrates excellent linear response and sensitivity, making it suitable for cost-effective pressure sensing applications.

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    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Sensor Technology

    Background:

    • Holographic sensors offer unique optical properties.
    • Photopolymers are versatile materials for optical element fabrication.
    • Pressure sensing is crucial in various industrial and scientific fields.

    Purpose of the Study:

    • To investigate the performance of a volume grating-based holographic pressure sensor.
    • To analyze the pressure sensing response of transmission and reflection sensor configurations.
    • To optimize the sensor for enhanced sensitivity and linear response.

    Main Methods:

    • Fabrication of a holographic pressure sensor using acrylamide photopolymer.
    • Analysis of diffraction spectrum under applied pressure.
    • Comparison of transmission and reflection sensor designs.
    • Characterization of peak wavelength shift, sensitivity, and linear range.

    Main Results:

    • The transmission sensor exhibited a peak wavelength shift of up to 25 nm under 1.58 × 10^5 Pa pressure.
    • A linear pressure response range exceeding 2.0 × 10^5 Pa was achieved.
    • Optimized sensitivity reached 4.9 × 10^3 Pa/nm.
    • Transmission sensors with large slanted angles showed superior performance compared to reflection sensors.

    Conclusions:

    • The holographic pressure sensor demonstrates linear and reversible peak wavelength shifts, confirming its applicability.
    • Photopolymer-based holographic pressure sensors are promising for cheap and visual pressure sensing.
    • Transmission gratings are key components for developing practical holographic sensors and optical elements.