Smartphone Spectrometers

McGonigle, Andrew J. S.; Wilkes, Thomas C.; Pering, Tom D.; Willmott, Jon R.; Cook, Joseph M.; Mims, Forrest M.; Parisi, Alfio V.

doi:10.3390/s18010223

Cited by 134 publications

(79 citation statements)

References 59 publications

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“…Finally, iSPEX 2 can be used as a low-cost instrument for portable or laboratory spectroscopy. 22,23 The working principle of SPEX and its implementation in iSPEX 2 are described in Sec. 2.…”

mentioning

confidence: 99%

A universal smartphone add-on for portable spectroscopy and polarimetry: iSPEX 2

Burggraaff

Perduijn²,

Hek³

et al. 2020

Micro- And Nanotechnology Sensors, Systems, and Applications XII

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Spectropolarimetry is a powerful technique for remote sensing of the environment. It enables the retrieval of particle shape and size distributions in air and water to an extent that traditional spectroscopy cannot. SPEX is an instrument concept for spectropolarimetry through spectral modulation, providing snapshot, and hence accurate, hyperspectral intensity and degree and angle of linear polarization. Successful SPEX instruments have included groundSPEX and SPEX airborne, which both measure aerosol optical thickness with high precision, and soon SPEXone, which will fly on PACE. Here, we present a low-cost variant for consumer cameras, iSPEX 2, with universal smartphone support. Smartphones enable citizen science measurements which are significantly more scaleable, in space and time, than professional instruments. Universal smartphone support is achieved through a modular hardware design and SPECTACLE data processing. iSPEX 2 will be manufactured through injection molding and 3D printing. A smartphone app for data acquisition and processing is in active development. Production, calibration, and validation will commence in the summer of 2020. Scientific applications will include citizen science measurements of aerosol optical thickness and surface water reflectance, as well as low-cost laboratory and portable spectroscopy.algorithm for c and a from multi-angular DoLP data. 9 Finally, spectropolarimetry of vegetation probes its physical characteristics, such as leaf orientation, and provides reflectance distribution functions, which are crucial for improving the accuracy of air-or space-based aerosol retrieval algorithms. 10Combining spectral and polarimetric measurements can be done in multiple ways. 11 First, regular spectroradiometers can be fitted with rotating polarizing filters, as was done in the aforementioned studies of water and vegetation. 9, 10 A second method is 'channeled' spectropolarimetry, where polarization information is encoded into the spectrum itself. One method for channeled linear spectropolarimetry is SPEX, 12 the basis for SPEXone. 6 In SPEX, incoming light is modulated with a sine wave with an amplitude and phase depending on the DoLP and the Angle of Linear Polarization (AoLP), respectively. 12 This is further explained in Sec. 2.2.The SPEX technique has been applied successfully in two high-end field-going instruments measuring aerosol optical thickness (AOT, sometimes termed aerosol optical depth, AOD), namely groundSPEX 13 and SPEX airborne. 14 GroundSPEX is a ground-based instrument based on a dual-channel fiber-optic spectrometer with SPEX optics on a moving mount, allowing sequential measurements at multiple angles. Its AOT measurements are well-correlated (Pearson r = 0.932) 13 with data from AERONET, the global network of photometers observing the solar almucantar and principal plane. 15 SPEX airborne, as the name implies, is an airborne instrument, simultaneously observing at nine fixed viewing angles. A 2017 campaign on a NASA ER-2 high-altitude aircraft demonstrated excellent...

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confidence: 99%

A universal smartphone add-on for portable spectroscopy and polarimetry: iSPEX 2

Burggraaff

Perduijn²,

Hek³

et al. 2020

Micro- And Nanotechnology Sensors, Systems, and Applications XII

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“…With the ever‐improving features both in hardware and software, the smartphone has emerged as a promising alternative platform for the development of different sensing and imaging tools in recent years . By integrating simple, compact optical setup to the rear camera or the ambient light sensor (ALS), the phone can be converted into a reliable sensing or imaging system .…”

Section: Introductionmentioning

confidence: 99%

Turbidimetric analysis of growth kinetics of bacteria in the laboratory environment using smartphone

Hatiboruah

Devi

Namsa

et al. 2020

Journal of Biophotonics

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For different microbiological and pathological studies, it is often required to monitor the growth of bacteria in a cultured medium in the laboratory environment. UV-VIS spectrophotometer is commonly used to estimate the growth of bacterial cell population by measuring the absorbance at 600 nm over a period of time. Colony-forming unit (CFU) is another approach, which has been routinely performed to estimate the live bacterial cells on semisolid agar plates. Herein, we demonstrate an alternative yet highly reliable sensing platform on a smartphone using which growth kinetics of different bacteria can be reliably monitored. The performance of the proposed smartphone sensor has been compared with the data obtained from OD600 and CFU analysis. A good correlation of bacterial growth rates enumerated based on the proposed smartphone sensor, bench-top spectrophotometer and CFU analysis have been observed under the experimental conditions. K E Y W O R D S bacteria, CFU Luria-broth medium, light scattering, optical density, smartphone

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“…Individual color outputs (RGB) were used for smartphones to distinguish chlorine contamination by the interaction of this contaminant with a colored chemical resulting in a change in coloring, it was captured by a smartphone that can be applied to effluent contaminated. Colorist was also estimated using a smartphone in bio metric analysis, as well as in the diagnosis of flame emissions and food characterization [8].…”

Section: Introductionmentioning

confidence: 99%

Using Mobile– iPhone as New Visible Colour Detector for Determination of Pharmaceutical (Potassium Permanganate)

Hussein

Al-Iessa

Al-Rufaie

et al. 2020

JPRI

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In this work the use of a mobile phone as a spectrophotometer using camera resolution by installing the software (application store AAP) on the phone (i Phone 6), which analyzes the colour images (RGB) in results with a colour length where it was possible to calculate the colour value of each image representing a specific concentration of the solution under study. A calibration curve with a range of (1 × 10-3 - 6.25 × 10-4) mmole.L-1 using optical image analysis with the concentration of the preparation of potassium permanganate (KMnO4). A calibration curve for statistical correlation range of 0.993 (R2) was found.

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Smartphone Spectrometers

Cited by 134 publications

References 59 publications

A universal smartphone add-on for portable spectroscopy and polarimetry: iSPEX 2

A universal smartphone add-on for portable spectroscopy and polarimetry: iSPEX 2

Turbidimetric analysis of growth kinetics of bacteria in the laboratory environment using smartphone

Using Mobile– iPhone as New Visible Colour Detector for Determination of Pharmaceutical (Potassium Permanganate)

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