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High dynamic spectroscopy using a digital micromirror device and periodic shadowing.

Elias Kristensson, Andreas Ehn, Edouard Berrocal

    Optics Express
    |January 14, 2017
    PubMed
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    We developed DMD-PS, an optical method to enhance dynamic range in 2D imaging spectroscopy to 22 bits. This technique uses a digital micromirror device (DMD) and periodic shadowing (PS) for improved sensitivity in a single exposure.

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    Area of Science:

    • Optical Engineering
    • Spectroscopy
    • Imaging Technology

    Background:

    • High dynamic range (HDR) imaging typically requires multiple exposures, risking saturation.
    • Conventional imaging spectroscopy faces limitations in dynamic range and sensitivity.

    Purpose of the Study:

    • To present DMD-PS, an optical solution to significantly boost the dynamic range of 2D imaging spectroscopic measurements.
    • To achieve high dynamic range (up to 22 bits) in a single exposure without CCD sensor saturation.

    Main Methods:

    • Incorporation of a digital micromirror device (DMD) before detection.
    • Application of the periodic shadowing (PS) technique to manage stray light.
    • Selective reduction of intense spectral lines using the DMD to amplify weaker signals.

    Main Results:

    • Demonstrated an improvement in dynamic range by a factor of ~100 over conventional imaging spectroscopy.
    • Achieved a dynamic range of up to 22 bits in proof-of-concept experiments.
    • Showcased the calibration-based concept for intensity distribution sensing.

    Conclusions:

    • The DMD-PS approach offers a novel method for enhancing dynamic range in 2D imaging spectroscopy.
    • This technique allows for improved detection sensitivity without compromising the sensor.
    • Future advancements in DMDs and camera sensors will further enhance the capabilities of this approach.