Recent developments in handheld and portable optosensing—A review

Capitán-Vallvey, L.F.; Palma, A.

doi:10.1016/j.aca.2011.04.005

Cited by 134 publications

(63 citation statements)

References 181 publications

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“…Optical sensing by portable devices has benefited greatly in the past decade by advances in technology for instrument development [1]. Light-emitting diodes capable of providing illumination from the ultraviolet to near infrared have become the most common light source for portable instrumentation.…”

Section: Introductionmentioning

confidence: 99%

Classification and quantitative optical analysis of liquid and solid samples using a mobile phone as illumination source and detector

Iqbal

Eriksson

2013

Sensors and Actuators B: Chemical

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A mobile phone has been used both as illumination source and image detector for quantitative optical analysis of colored liquid samples (4 different colorants) and solid samples (printed color patterns, plastic beads and colored sand grains). Even though the measurement conditions were far from ideal, because the light source was strongly polychromatic and the illumination was not a collimated light beam with homogeneous light intensity, a logarithmic concentration dependence, in accordance with the Beer-Lambert law, described the data of the colored liquids quite well. By utilizing blue-blue (420-510 nm), green-green (480-590 nm) and red-red (575-695 nm) illumination/detection combinations, each sample could be assigned a unique color signature for classification that agreed with reference absorbance spectra measured with a spectrometer. Quantification of validation samples within a few percent of the actual values was achieved. Also the long-term repeatability of the measurements was investigated and was surprisingly good for such a simple system. Analysis of the colored solid samples was more complex with results being dependent on the morphology and colorimetric properties of the samples

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Section: Introductionmentioning

confidence: 99%

Classification and quantitative optical analysis of liquid and solid samples using a mobile phone as illumination source and detector

Iqbal

Eriksson

2013

Sensors and Actuators B: Chemical

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“…The design and selection of the fibre determines the peak wavelength of the output illumination; options exist to span the UV-Vis-NIR spectrum. A detailed review of the recently reported fibre optics based systems provides in-depth analysis of these systems for various water contaminants monitoring [19]. Notably, the coating of the fibre determines the sensitivity and selectivity of the sensor and research is continuing to develop novel materials that would suit the need of a particular sensing task [20,21].…”

Section: Fibre Optic Sensors For Real-time Water Quality Monitoringmentioning

confidence: 99%

Monitoring of Nitrates and Phosphates in Wastewater: Current Technologies and Further Challenges

Korostynska

Mason

Al-Shamma’a

2012

International Journal on Smart Sensing and Intelligent Systems

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Abstract-Consumers expect water supply companies to deliver safe drinking water that meets both health quality standards and aesthetic requirements such as colour, turbidity, taste and odour. Current water quality assessment methods of these parameters, which form the basis for sound water resources management, are mainly laboratory based, require fresh supply of chemicals, trained staff and are time consuming. Real-time water quality monitoring is essential for National and International Health and Safety, as it can significantly reduce the level of damage and also the cost to remedy the problem. This paper critically analyses both commercially available and state-of-the-art research methods and devices suitable for real-time wastewater quality monitoring and suggests further developments in this area. In particular, the focus is made on the monitoring of nitrates and phosphates in wastewater and a novel microwave based method for instantaneous water quality assessment is suggested.Index terms: water quality monitoring, in situ analysis, optical methods, industry, nitrates and phosphates, lab on chip sensors, microwave sensors, solid-state sensors.

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“…1 These instruments are useful and advantageous, especially due to the low cost, simplicity of operation, convenience of fast in situ analysis and appropriate sensitivity and specificity to produce near realtime information used to solve specific problems which require rapid feedback of information. 2 Examples of portable instruments based on ion trap mass, 3 Raman, 4 near infrared 5 and mid-infrared 6 spectroscopies, capillary electrophoresis [7][8][9][10][11] and X-ray fluorescence 12 represent the tendency of instrument miniaturization for sensing applications.…”

Section: Introductionmentioning

confidence: 99%

A Low-Cost Video-Based Reflectometer for Selective Detection of Cu2+ Using Paper-Based Colorimetric Sensors

Morais

Silva

Pinheiro

et al. 2017

J. Braz. Chem. Soc.

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This paper presents a low-cost reflectometer for selective detection of Cu 2+ . The reflectometer is based on an emission light source using five light-emitting diodes at different wavelengths and a detector using a webcam. The samples were prepared using a filter paper-based colorimetric sensor with ascorbic acid-based quinoxaline derivative. Video analysis using gray color intensity was used to perform both copper ion screening ( ) and quantification of Cu 2+ in spiked samples. In addition, a multivariate validation was performed. The system proved to be selective to Cu 2+ among the screened ions, and its quantification was performed using partial least square regressions. Good linearity (R 2 = 0.979, coefficient of determination), low root-mean-square error of prediction (RMSEP = 5.20 × 10 -3 mol L -1 ) and high recovery (93.39-128.64%) were achieved. This method has potential to be employed for rapid and selective determination of Cu 2+ in water using low-cost instrumentation.

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Recent developments in handheld and portable optosensing—A review

Cited by 134 publications

References 181 publications

Classification and quantitative optical analysis of liquid and solid samples using a mobile phone as illumination source and detector

Classification and quantitative optical analysis of liquid and solid samples using a mobile phone as illumination source and detector

Monitoring of Nitrates and Phosphates in Wastewater: Current Technologies and Further Challenges

A Low-Cost Video-Based Reflectometer for Selective Detection of Cu2+ Using Paper-Based Colorimetric Sensors

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