Development of G-Fresnel lens-based mu-spectrometer

Min, Kyung-Pyo; Kang, Sun-Woo; Kim, Gi‐Woo

doi:10.1117/12.2514181

Cited by 1 publication

(1 citation statement)

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“…These can also be applied for use as biochemical sensors [20,21]. The G-Fresnel optical device was made of polydimethylsiloxane (PDMS) as an alternative lens material [22,23,24,25,26,27,28]. However, these researchers only focused on the fabrication method of a PDMS-based G-Fresnel lens.…”

Section: Introductionmentioning

confidence: 99%

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

Min

Kim

Song

et al. 2019

Sensors

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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.

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