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

被引:132
作者
Das, Anshuman J. [1 ]
Wahi, Akshat [2 ]
Kothari, Ishan [3 ]
Raskar, Ramesh [1 ]
机构
[1] MIT, Media Lab, 75 Amherst St, Cambridge, MA 02139 USA
[2] WeSch, Lakhamsi Nappu Rd,Matunga East, Mumbai 400019, Maharashtra, India
[3] VIT, Near Katpadi Rd, Vellore 632014, Tamil Nadu, India
关键词
CHLOROPHYLL FLUORESCENCE; APPLE FRUIT; SPECTROSCOPY; ANTHOCYANINS; RELEVANCE; QUALITY; ASSAYS;
D O I
10.1038/srep32504
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
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 x 37 mm x 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.
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页数:8
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