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 Post subject: changhong h2 phone with build in NIR spectroscope
PostPosted: Wed Jun 14, 2017 1:02 am 
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433 USD will buy you the changhong H2 new phone with a build in NIR spectroscope =D>
its nice to see instruments like this one getting much smaller and cheaper.


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 Post subject: Re: changhong h2 phone with build in NIR spectroscope
PostPosted: Wed Jun 14, 2017 5:53 am 
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i doubt it works with Gemstones unless it gets proper calibration and software

but i liked their pocket size handheld spectrometer much more: https://www.consumerphysics.com

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 Post subject: Re: changhong h2 phone with build in NIR spectroscope
PostPosted: Wed Jun 14, 2017 11:12 am 
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Yes, its not ready for gemological use yet but given time it will be. :D


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 Post subject: Re: changhong h2 phone with build in NIR spectroscope
PostPosted: Sat Jun 17, 2017 8:21 am 
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The Changhong smartphone uses the SCIO spectrometer module. A basic limitation of SCIO, which is marketed as "NIR" spectrometer, is the limited wavelength range: only 700 - 1100 nm
(https://consumerphysics.desk.com/customer/en/portal/articles/2226579-what-is-scio-s-wavelength-)

NIR spectroscopy is widely used to determine material composition, as the band mesured in NIR are "overtones" of the FTIR bands. Usually, the NIR wavelength range is about 700 - 2500 nm. SCIO uses only a small fraction of it, therefore the discriminatory power is limited, in comparison to a "real" NIR spectrometer. In contrast, the TellSpec minature spectrometer has a double wavelength range (900 - 1700 nm) and might be better suited... http://tellspec.com/

Speaking about NIR databases: there is already a free database with NIR reflectance data from rocks &minerals from USGS, with almost 900 entries. Recently, I compiled a database from this data set for use with my Spectragryph software: http://www.effemm2.de/spectragryph/down_databases.html


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 Post subject: Re: changhong h2 phone with build in NIR spectroscope
PostPosted: Sun Jun 18, 2017 3:27 am 
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Very interesting!! But wants to know how much body fat....

Hey Mikko and Alberto!!

We need a "gem" tricorder!!! :D

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