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Open AccessArticle

A G-Fresnel Optical Device and Image Processing Based Miniature Spectrometer for Mechanoluminescence Sensor Applications

1
Department of Mechanical Engineering, Inha University, Incheon 22212, Korea
2
Department of Engineering, Norfolk State University, Norfolk, VA 23504, USA
*
Author to whom correspondence should be addressed.
Sensors 2019, 19(16), 3528; https://doi.org/10.3390/s19163528
Received: 29 July 2019 / Revised: 6 August 2019 / Accepted: 9 August 2019 / Published: 12 August 2019
(This article belongs to the Section Optical Sensors)
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Abstract

This paper presents a miniature spectrometer fabricated based on a G-Fresnel optical device (i.e., diffraction grating and Fresnel lens) and operated by an image-processing algorithm, with an emphasis on the color space conversion in the range of visible light. The miniature spectrometer will be cost-effective and consists of a compact G-Fresnel optical device, which diffuses mixed visible light into the spectral image and a μ-processor platform embedded with an image-processing algorithm. The RGB color space commonly used in the image signal from a complementary metal–oxide–semiconductor (CMOS)-type image sensor is converted into the HSV color space, which is one of the most common methods to express color as a numeric value using hue (H), saturation (S), and value (V) via the color space conversion algorithm. Because the HSV color space has the advantages of expressing not only the three primary colors of light as the H but also its intensity as the V, it was possible to obtain both the wavelength and intensity information of the visible light from its spectral image. This miniature spectrometer yielded nonlinear sensitivity of hue in terms of wavelength. In this study, we introduce the potential of the G-Fresnel optical device, which is a miniature spectrometer, and demonstrated by measurement of the mechanoluminescence (ML) spectrum as a proof of concept. View Full-Text
Keywords: G-Fresnel optical device; miniature spectrometer; digital image processing; HSV color space; mechanoluminescence sensor G-Fresnel optical device; miniature spectrometer; digital image processing; HSV color space; mechanoluminescence sensor
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Min, K.-P.; Kim, J.; Song, K.D.; Kim, G.-W. A G-Fresnel Optical Device and Image Processing Based Miniature Spectrometer for Mechanoluminescence Sensor Applications. Sensors 2019, 19, 3528.

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