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Related Concept Videos

UV–Vis Spectrometers01:14

UV–Vis Spectrometers

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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.
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Thickness sensor for drying paints using THz spectroscopy.

Jacobus L M van Mechelen, Andreas Frank, Deran J H C Maas

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    |March 17, 2021
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    Summary
    This summary is machine-generated.

    Optical terahertz (THz) technology offers unique material insights for the automotive industry. A new THz sensor system accurately predicts paint dry thickness, reducing waste in car production.

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    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Spectroscopy

    Background:

    • Optical terahertz (THz) technology, despite its potential, lacks widespread application due to maturity and cost issues.
    • The automotive industry faces significant challenges and costs associated with optimizing paint shop coating processes.
    • Accurate, real-time monitoring of paint drying is crucial for quality control and waste reduction in automotive manufacturing.

    Purpose of the Study:

    • To develop a novel THz-based sensor system for real-time monitoring of drying polymer coatings.
    • To address the technological gap in paint quality inspection within the automotive sector.
    • To create a robust and accurate sensor system that predicts final paint thickness without calibration.

    Main Methods:

    • Utilizing terahertz (THz) radiation and time-domain spectroscopy to study the light-matter interaction of drying polymer coatings.
    • Developing advanced signal processing algorithms to determine the state of matter in drying paints.
    • Designing a bespoke optical beam for industrial robustness and implementing a sensor demonstrator.

    Main Results:

    • The developed THz sensor system accurately predicts the eventual dry thickness of coatings without requiring paint-type calibration.
    • The sensor demonstrates superior performance, outperforming current state-of-the-art thickness sensors for dry coatings by a factor of three.
    • This represents the first sensor system capable of inspecting wet coatings and predicting dry thickness.

    Conclusions:

    • The novel THz sensor system shows significant promise as a game-changer for automotive paint shops, potentially reducing global scrap rates.
    • The technology overcomes previous limitations of THz applications by targeting a specific, high-value market need.
    • Successful implementation of this sensor can lead to substantial cost savings and quality improvements in automotive production.