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"A new pencil-like wireless spectrometer can be used with a smartphone to collect 3D spectral images of the body and other objects. This design could make the device useful for point-of-care diagnostics" (The Optical Society, 2017).  Image Credit:  Dan Wang, Beijing University of Chemical Technology

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Study the molecules in food, water....etc.

potential to become a personal analyzer in daily life

ocean color sensing

bio-imaging

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It uses a commercially available complementary metal-oxide-semiconductor (CMOS) camera and transmits images to a smartphone.

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Affordable with components that cost less than $300

Portable

Light weight

Anyone can assemble it

Can be used for bio-imaging

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The spectral resolution is not fully optimized yet

Has not yet been tested in the field

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Cai, F., Wang, D., Zhu, M., & He, S. (2017). Pencil-like imaging spectrometer for bio-samples sensing. Biomedical Optics Express, 8(12), 5427. doi:10.1364/boe.8.005427

Image Credits:  Dan Wang, Beijing University of Chemical Technology

The Optical Society. (2017, November 8). Wireless Handheld Spectrometer Transmits Data to Smartphone | News Releases | The Optical Society. Retrieved from https://www.osa.org/en-us/about_osa/newsroom/news_releases/2017/wireless_handheld_spectrometer_transmits_data_to_s/

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Researchers have shown that it is possible to train artificial neural networks directly on an optical chip. The significant breakthrough demonstrates that an optical circuit can perform a critical function of an electronics-based artificial neural network and could lead to less expensive, faster and more energy efficient ways to perform complex tasks such as speech or image recognition.
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Wireless Handheld Spectrometer Transmits Data to Smartphone | News Releases | The Optical Society

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Spectral images, which contain more color information than is obtainable with a typical camera, reveal characteristics of tissue and other biological samples that can't be seen by the naked eye. A new smartphone-compatible device that is held like a pencil could make it practical to acquire spectral images of everyday objects and may eventually be used for point-of-care medical diagnosis in remote locations.

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The portable spectrometer has the potential to be a valuable tool. Although this technology is not yet perfected, it is a prime example of what is to come.  This portable, affordable equipment can be taken anywhere and allows for fast evaluation.  This technology and others to come like it, can decrease costly, unnecessary testing.