scholarly journals Miniaturized NIR Spectrometer Based on Novel MOEMS Scanning Tilted Grating

Micromachines ◽  
2018 ◽  
Vol 9 (10) ◽  
pp. 478 ◽  
Author(s):  
Jian Huang ◽  
Quan Wen ◽  
Qiuyu Nie ◽  
Fei Chang ◽  
Ying Zhou ◽  
...  
Keyword(s):  
Closed Loop ◽  
Near Infrared ◽  
Signal To Noise Ratio ◽  
Low Cost ◽  
Measuring Time ◽  
Loop Control ◽  
Infrared Spectrometer ◽  
Potential Alternative ◽  
Near Infrared Spectrometer ◽  
Better Than

This paper presents a dispersive near-infrared spectrometer with features of miniaturization, portability and low cost. The application of a resonantly-driven scanning grating mirror (SGM) as a dispersive element in a crossed Czerny–Turner configuration enables the design of a miniaturized spectrometer that can detect the full spectra using only one single InGaAs diode. In addition, a high accuracy recalculation is realized, which can convert time-dependent measurements to spectrum information by utilizing the deflection position detector integrated on SGM and its associated closed-loop control circuit. Finally, the spectrometer prototype is subjected to a series of tests to characterize the instrument’s performance fully. The results of the experiment show that the spectrometer works in a spectral range of 800 nm–1800 nm with a resolution of less than 10 nm, a size of 9 × 7 × 7 cm3, a wavelength stability better than ±1 nm and a measuring time of less than 1 ms. Furthermore, the power consumption of the instrument is 3 W at 5 V DC, and the signal-to-noise ratio is 3267 at full scale. Therefore, this spectrometer could be a potential alternative to classical spectrometers in process control applications or could be used as a portable or airborne spectroscopic sensor.

Performance of a near Infrared Spectrometer Equipped with an Autosampling Accessory

2003 ◽  
Vol 11 (2) ◽  
pp. 83-95
Author(s):  
Nathalie Szydlowski-Zanier ◽  
Marc Berger ◽  
François Wahl ◽  
Denis Guillaume
Keyword(s):  
Near Infrared ◽  
Signal To Noise Ratio ◽  
Low Cost ◽  
Cetane Number ◽  
Chemical Properties ◽  
Signal To Noise ◽  
Physico Chemical ◽  
Infrared Spectrometer ◽  
The Stability ◽  
Near Infrared Spectrometer

The performance of a Fourier-transform near infrared (FT-NIR) spectrometer equipped with an autosampling accessory (AutoSamplIR) using disposable vials with uncontrolled pathlength has been compared with the performance of an FT-NIR equipped with a manual vial sampling accessory using a reusable cell with calibrated pathlength. The effect of different parameters such as the signal-to-noise ratio, the stability of the purge and the linearity of absorbance have been evaluated by means of the NIR predictions of two physico-chemical properties of interest for gasoils, i.e the wt% of hydrogen and the cetane number (CN). It has been shown that an FT-NIR with the autosampling accessory can be used advantageously at low cost for quick and precise analyses of small amounts of sample.

scholarly journals The Improvement on the Performance of DMD Hadamard Transform Near-Infrared Spectrometer by Double Filter Strategy and a New Hadamard Mask

Micromachines ◽  
2019 ◽  
Vol 10 (2) ◽  
pp. 149 ◽  
Author(s):  
Zifeng Lu ◽  
Jinghang Zhang ◽  
Hua Liu ◽  
Jialin Xu ◽  
Jinhuan Li
Keyword(s):  
Near Infrared ◽  
Signal To Noise Ratio ◽  
Nonuniform Distribution ◽  
Stray Light ◽  
Spectral Energy ◽  
Hadamard Transform ◽  
Digital Micromirror Device ◽  
Infrared Spectrometer ◽  
Near Infrared Spectrometer ◽  
The Impact

In the Hadamard transform (HT) near-infrared (NIR) spectrometer, there are defects that can create a nonuniform distribution of spectral energy, significantly influencing the absorbance of the whole spectrum, generating stray light, and making the signal-to-noise ratio (SNR) of the spectrum inconsistent. To address this issue and improve the performance of the digital micromirror device (DMD) Hadamard transform near-infrared spectrometer, a split waveband scan mode is proposed to mitigate the impact of the stray light, and a new Hadamard mask of variable-width stripes is put forward to improve the SNR of the spectrometer. The results of the simulations and experiments indicate that by the new scan mode and Hadamard mask, the influence of stray light is restrained and reduced. In addition, the SNR of the spectrometer also is increased.

scholarly journals Polymer Type Identification of Marine Plastic Litter Using a Miniature Near-Infrared Spectrometer (MicroNIR)

2020 ◽  
Vol 10 (23) ◽  
pp. 8707
Author(s):  
Svetlana Pakhomova ◽  
Igor Zhdanov ◽  
Bert van Bavel
Keyword(s):  
Marine Environment ◽  
Near Infrared ◽  
Low Cost ◽  
Visual Assessment ◽  
Correct Identification ◽  
Plastic Pollution ◽  
Spectra Analysis ◽  
Infrared Spectrometer ◽  
Site Identification ◽  
Near Infrared Spectrometer

Plastic pollution in the marine environment has turned into an important research topic in recent decades. Until recently, studies were often based on visual assessment only, which is not enough to draw any conclusion about the chemical nature of found plastic items and could lead to incorrect results. Standardized, fast, and efficient low-cost methods for marine plastic litter identification are urgently needed to monitor the occurrence and distribution worldwide. In this paper, we demonstrate that a miniaturized handheld near-infrared spectrometer—MicroNIR—can be used for on-site identification of different plastic polymers. A database containing polymer spectra of the most produced and reported polymer types in the marine environment was created including polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), polystyrene (PS), polyvinyl chloride (PVC), polyamide (PA), polycarbonate (PC), polyurethane (PUR), and Silicone. Using spectral match value (SMV, included in the instrument software) for spectra analysis resulted in an accurate classification of all nine polymer types. The method was used for the identification of marine macro-, meso-, and microplastic litter collected on beaches in sediments and seawater and enabled the correct identification of marine plastic litter for macro-, meso- (96%), and microplastics (73%) with exception of totally black items and items less than 1 mm in size. The method and instrumentation presented here are very well suited to support “Citizen Science” marine litter monitoring projects during beach cleaning and similar activities.

Near-IR Multiplex Bandpass Spectrometer Utilizing Liquid Molecular Filters

1995 ◽  
Vol 49 (4) ◽  
pp. 493-498 ◽  
Author(s):  
Andrew Fong ◽  
Gary M. Hieftje
Keyword(s):  
Propylene Glycol ◽  
High Throughput ◽  
Near Infrared ◽  
Signal To Noise Ratio ◽  
High Signal ◽  
Ir Radiation ◽  
Near Ir ◽  
Infrared Spectrometer ◽  
Near Infrared Spectrometer

A simple near-infrared spectrometer is described which uses common liquids as near-IR spectral filters. Each filter substance passes multiple bands of near-IR radiation. This new type of spectrometer offers simplicity, cost advantages, and enhanced throughput. The high throughput is useful for ensuring the high signal-to-noise ratio typically needed for chemometrics. The high throughput also allows the use of longer sample pathlengths. The performance of the spectrometer is demonstrated in the determination of methanol through a 1-cm pathlength of water and in the determination of trace amounts of water in organic solvents such as propylene glycol and dimethyl sulfoxide (DMSO). Best-case detection limits were 0.02% (w/w) methanol in water, 0.0006% water in DMSO, and 0.004% water in propylene glycol.

Near-Infrared Spectroscopy Signal Extraction and Processing Design

2013 ◽  
Vol 404 ◽  
pp. 555-559 ◽  
Author(s):  
Ke Zhao ◽  
Jian Hua Jiang ◽  
Jun Fang Fu ◽  
Jin Bo Xu
Keyword(s):  
Near Infrared ◽  
Experimental Testing ◽  
Signal To Noise Ratio ◽  
High Reliability ◽  
Digital Signal ◽  
Signal Extraction ◽  
Filter Method ◽  
Infrared Spectrometer ◽  
Filtering Function ◽  
Near Infrared Spectrometer

This paper introduces the MSP430 MCU-based near-infrared spectrometer front-end signal extraction and software signal processing design.The system adopts phase locked loop technology to signal phase shift processing. Phase sensitive filtering function achieved by the balance modem AD630.Finally the analog signal is converted to digital signal by AD7715 for the microprocessor processed.Microprocessor receives digital signal, filter processing is performed using a first order lag filter method to determine the point of measurement value.Through the comparison analysis of the experimental testing result, the program has higher signal-to-noise ratio and suppress interference ability, high reliability, good stability,etc.

Investigating the total antioxidant capacity of gluten-free grains with miniaturized near-infrared spectrometer

NIR news ◽  
2019 ◽  
Vol 30 (5-6) ◽  
pp. 35-38
Author(s):  
Verena Wiedemair ◽  
Christian Wolfgang Huck
Keyword(s):  
Antioxidant Capacity ◽  
Total Antioxidant Capacity ◽  
High Performance ◽  
Near Infrared ◽  
Least Squares Regression ◽  
Test Set ◽  
Total Antioxidant ◽  
Infrared Spectrometer ◽  
Near Infrared Spectrometer ◽  
Infrared Instruments

The use of ever smaller near-infrared instruments is becoming more and more prevalent, since they are cheaper, more versatile and often advertised as high-performance spectrometer. The last claim is rarely verified by independent researchers, which is why the presented work evaluates the performance of three hand-held spectrometers in comparison to a benchtop instrument. Seventy-seven samples comprising buckwheat, millet and oat were investigated for their total antioxidant capacity using Folin–Ciocalteu and near-infrared spectroscopy. Partial least squares regression models were established using cross- and test set validation. Results showed that all instruments were able to predict total antioxidant capacity to some extent. The coefficients of determinations ranged from 0.823 to 0.951 for cross-validated and from 0.849 to 0.952 for test set validated models. Errors for cross-validated models ranged from 1.11 to 2.08 mgGAE/g and for test set validated models from 1.02 to 1.86 mgGAE/g.

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