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Two measurement modes for mobile phone optical sensing
Linköpings universitet, Institutionen för fysik, kemi och biologi, Tillämpad Fysik. Linköpings universitet, Tekniska högskolan.ORCID-id: 0000-0002-0873-2877
Linköpings universitet, Institutionen för fysik, kemi och biologi, Kemiska och optiska sensorsystem. Linköpings universitet, Tekniska fakulteten.
2014 (engelsk)Inngår i: Sensors and actuators. B, Chemical, ISSN 0925-4005, E-ISSN 1873-3077, Vol. 195, s. 63-70Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

The use of a mobile phone for classification and quantification of liquid samples is described. The screen of the phone is used for controlled illumination and the front side camera for imaging. No additional optical equipment is needed. It is shown that there are different regions of the captured image containing different information about the sample. One region contains light that has been specular reflected at the air-liquid interface and one is dominated by light that has propagated through the liquid. The specular reflected light contains information about the refractive index of the liquid sample whereas the transmitted light contains information about color and absorption. It is found that the specular reflectance increases linearly with increasing refractive index, n, in the range 1.33 less than n less than 1.38, as expected from the Fresnel equations. A change of the refractive index of about 0.004 refractive units can be detected. The transmitted light intensity is well described by the Beer-Lambert law over a large absorption range. Light from the two different areas of the image is used to analyze several types of liquid samples. It is shown that a combination of the two measurement modes improves the classification abilities of the mobile phone.

sted, utgiver, år, opplag, sider
Elsevier , 2014. Vol. 195, s. 63-70
Emneord [en]
Mobile phone; Optical sensor; Refractive index; Liquids; Absorption
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Identifikatorer
URN: urn:nbn:se:liu:diva-105893DOI: 10.1016/j.snb.2014.01.005ISI: 000332417600010OAI: oai:DiVA.org:liu-105893DiVA, id: diva2:712118
Tilgjengelig fra: 2014-04-14 Laget: 2014-04-12 Sist oppdatert: 2017-12-05

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