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Sci Rep. 2016 Sep 8;6:32504. doi: 10.1038/srep32504.

Ultra-portable, wireless smartphone spectrometer for rapid, non-destructive testing of fruit ripeness.

Author information

1
MIT Media Lab, Massachusetts Institute of Technology, 75 Amherst, St. Cambridge, MA, 02139, USA.
2
WeSchool, Lakhamsi Nappu Road, Matunga East, Mumbai, Maharashtra 400019, India.
3
VIT, Near Katpadi Rd, Vellore, Tamil Nadu 632014, India.

Abstract

We demonstrate a smartphone based spectrometer design that is standalone and supported on a wireless platform. The device is inherently low-cost and the power consumption is minimal making it portable to carry out a range of studies in the field. All essential components of the device like the light source, spectrometer, filters, microcontroller and wireless circuits have been assembled in a housing of dimensions 88 mm × 37 mm × 22 mm and the entire device weighs 48 g. The resolution of the spectrometer is 15 nm, delivering accurate and repeatable measurements. The device has a dedicated app interface on the smartphone to communicate, receive, plot and analyze spectral data. The performance of the smartphone spectrometer is comparable to existing bench-top spectrometers in terms of stability and wavelength resolution. Validations of the device were carried out by demonstrating non-destructive ripeness testing in fruit samples. Ultra-Violet (UV) fluorescence from Chlorophyll present in the skin was measured across various apple varieties during the ripening process and correlated with destructive firmness tests. A satisfactory agreement was observed between ripeness and fluorescence signals. This demonstration is a step towards possible consumer, bio-sensing and diagnostic applications that can be carried out in a rapid manner.

PMID:
27606927
PMCID:
PMC5015488
DOI:
10.1038/srep32504
[Indexed for MEDLINE]
Free PMC Article

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