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Related Concept Videos

UV–Vis Spectrometers01:14

UV–Vis Spectrometers

The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell. Samples for...

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Nanostructured Ag-zeolite Composites as Luminescence-based Humidity Sensors
07:13

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Published on: November 15, 2016

Measuring humidity with planar polyimide light guides.

H Franke, D Wagner, T Kleckers

    Applied Optics
    |September 11, 2010
    PubMed
    Summary
    This summary is machine-generated.

    Planar polyimide light guides offer optical humidity detection. Changes in phase shift due to moisture in a phase-matched waveguide are detectable, enabling sensitive humidity measurements.

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    Area of Science:

    • Optoelectronics
    • Materials Science
    • Sensor Technology

    Background:

    • Planar polyimide light guides can function as optical sensors.
    • Humidity affects the optical properties of materials.
    • Phase-matched waveguides exhibit polarization-dependent behavior.

    Purpose of the Study:

    • To investigate the use of phase-matched polyimide light guides for optical humidity detection.
    • To quantify the sensitivity of these guides to varying humidity levels.
    • To understand the underlying mechanisms of humidity-induced changes in the waveguide.

    Main Methods:

    • Utilizing a phase-matched waveguide with crossed polarizers to detect phase shifts.
    • Measuring the sensitivity curve for fluorinated polyimide light guides across a 10-75% relative humidity range.
    • Employing a half-integrated interferometer to measure shifts in effective mode indices for each polarization.
    • Analyzing results based on water indiffusion and material swelling.

    Main Results:

    • An oscillating output signal indicates moisture-induced phase shifts.
    • A sensitivity curve for humidity detection (10-75% RH) was established for fluorinated polyimide guides.
    • A four-layer waveguide arrangement showed enhanced sensitivity.
    • Refractive index increase and swelling were identified as key mechanisms.

    Conclusions:

    • Phase-matched polyimide light guides are effective for optical humidity sensing.
    • The sensitivity is influenced by waveguide design and material properties.
    • Water indiffusion and swelling are the primary causes of signal changes.