Optical fiber smartphone spectrometer

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Journal Article
Optics Letters, 2016, 41 (10), pp. 2237 - 2240
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© 2016 Optical Society of America. An optical fiber-based smartphone spectrometer incorporating an endoscopic fiber bundle is demonstrated. The endoscope allows transmission of the smartphone camera LED light to a sample, removing complications from varying background illumination. The reflected spectra collected from a surface or interface is dispersed onto the camera CMOS using a reflecting diffraction grating. A spectral resolution as low as δλ ∼ 2.0 nm over a bandwidth of Δλ ∼ 250 nm is obtained using a slit width, ωslit = 0.7 mm. The instrument has vast potential in a number of industrial applications including agricultural produce analysis. Spectral analysis of apples shows straightforward measurement of the pigments anthocyanins, carotenoid, and chlorophyll, all of which decrease with increasing storage time.
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