Bringing NIR spectrometers into mobile phones

Reinig, Peter; Grüger, Heinrich; Knobbe, Jens; Pügner, Tino; Meyer, Sebastian

doi:10.1117/12.2289931

Cited by 14 publications

(9 citation statements)

References 3 publications

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“…This device covers 950-1900 nm at a 10 nm resolution and has a volume of only 2.1 cm 3 . 187,188 The class of devices known variously as programmable gratings, spatial light modulators, and grating light valves are also MOEMS devices, 189 and the Polychromix (now Thermo Fisher Scientific) instrument, described below, utilizes this technology. Another MOEMS device is the Texas Instruments digital light projector (DLP), used as an engine for small NIR instruments, also described below.…”

Section: Micro-electro-mechanical Systems-based Spectrometersmentioning

confidence: 99%

Portable Spectroscopy

Crocombe¹

2018

Appl Spectrosc

377

233

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Until very recently, handheld spectrometers were the domain of major analytical and security instrument companies, with turnkey analyzers using spectroscopic techniques from X-ray fluorescence (XRF) for elemental analysis (metals), to Raman, mid-infrared, and near-infrared (NIR) for molecular analysis (mostly organics). However, the past few years have seen rapid changes in this landscape with the introduction of handheld laser-induced breakdown spectroscopy (LIBS), smartphone spectroscopy focusing on medical diagnostics for low-resource areas, commercial engines that a variety of companies can build up into products, hyphenated or dual technology instruments, low-cost visible-shortwave NIR instruments selling directly to the public, and, most recently, portable hyperspectral imaging instruments. Successful handheld instruments are designed to give answers to non-scientist operators; therefore, their developers have put extensive resources into reliable identification algorithms, spectroscopic libraries or databases, and qualitative and quantitative calibrations. As spectroscopic instruments become smaller and lower cost, ''engines'' have emerged, leading to the possibility of being incorporated in consumer devices and smart appliances, part of the Internet of Things (IOT). This review outlines the technologies used in portable spectroscopy, discusses their applications, both qualitative and quantitative, and how instrument developers and vendors have approached giving actionable answers to non-scientists. It outlines concerns on crowdsourced data, especially for heterogeneous samples, and finally looks towards the future in areas like IOT, emerging technologies for instruments, and portable hyphenated and hyperspectral instruments.

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Section: Micro-electro-mechanical Systems-based Spectrometersmentioning

confidence: 99%

Portable Spectroscopy

Crocombe¹

2018

Appl Spectrosc

377

233

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“…Portable NIR actually ensure comparable analytical results to laboratory benchtop devices, in both qualitative and quantitative aspects. Weight is a fundamental parameter for portable instruments: compared to 1 kg of Raman and MIR spectrometers, NIR handheld weight is about 100 g and the close future is the integration into cellular phones ( Reinig et al, 2018 ).…”

Section: Portable Nir Spectrometersmentioning

confidence: 99%

Portable NIR spectroscopy: the route to green analytical chemistry

Gullifa,

Barone,

Papa

et al. 2023

Front. Chem.

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There is a growing interest for cost-effective and nondestructive analytical techniques in both research and application fields. The growing approach by near-infrared spectroscopy (NIRs) pushes to develop handheld devices devoted to be easily applied for in situ determinations. Consequently, portable NIR spectrometers actually result definitively recognized as powerful instruments, able to perform nondestructive, online, or in situ analyses, and useful tools characterized by increasingly smaller size, lower cost, higher robustness, easy-to-use by operator, portable and with ergonomic profile. Chemometrics play a fundamental role to obtain useful and meaningful results from NIR spectra. In this review, portable NIRs applications, published in the period 2019–2022, have been selected to indicate starting references. These publications have been chosen among the many examples of the most recent applications to demonstrate the potential of this analytical approach which, not having the need for extraction processes or any other pre-treatment of the sample under examination, can be considered the “true green analytical chemistry” which allows the analysis where the sample to be characterized is located. In the case of industrial processes or plant or animal samples, it is even possible to follow the variation or evolution of fundamental parameters over time. Publications of specific applications in this field continuously appear in the literature, often in unfamiliar journal or in dedicated special issues. This review aims to give starting references, sometimes not easy to be found.

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“…Grating based spectrometers are well known for almost a century [5]. Systems based on the integration of a grating structure into the technology of a MEMS scanning device have been presented in different configurations such as classical Czerny Turner "W-configuration" [6] as well as folded double-V to overcome the limitation that it is difficult to tilt the grating out of the chip plane when not deflected [4]. Besides aspects of the collimation and refocusing optics, the deflection of the MEMS scanning grating device is always a relevant issue.…”

Section: Scanning Mirror Micro Spectrometer Optical Designmentioning

confidence: 99%

Applications for a broadband NIR spectrometer with scanning mirror device

Grüger

Knobbe

Kruse

et al. 2023

MOEMS and Miniaturized Systems XXII

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Spectral analysis has gained a lot of interest throughout the last decades. Nondestructive and non-contact evaluations can provide multiple information: appearance and composition, but also more complex details, which can be accessed by means of sophisticated methods like fluorescence or Raman scattering. Spectrometers have been widely used for the UV to NIR spectral range. There are applications, where a broad spectral range is beneficial. Typically, the spectral range of a grating based system is limited by higher diffraction orders. Either one decade can be detected or order filters have to be applied to discriminate different orders. A novel concept for a broadband spectrometer is the use of a scanning mirror device to illuminate a fixed grating. Due to the optical path inside, the double wavelength range can be addressed for the identical MEMS deflection. Two or more detectors, each optimized for the relevant spectral range, can be placed in the setup. A first sample of a scanning mirror micro spectrometer (“SMMS”) has been realized and tested successfully. In the NIR spectral range from 1000 nm to 1900 nm a resolution of 10 nm (FWHM) has been achieved. Application examples can be found in the field of agriculture - soil, plant growth and watering, directly leading to food, e.g. ripeness and freshness. Spectrometer with broad spectral range enable simultaneous detection of appearance (color) and composition (NIR); also fungus and aflatoxins can be detected by means of UV to VIS fluorescence. Similar task arise in textile, recycling and other fields where color, composition and conditions are of interest.

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Bringing NIR spectrometers into mobile phones

Cited by 14 publications

References 3 publications

Portable Spectroscopy

Portable Spectroscopy

Portable NIR spectroscopy: the route to green analytical chemistry

Applications for a broadband NIR spectrometer with scanning mirror device

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