Performance and Selected Applications of an Acousto-Optic Tunable Filter Near-Infrared Spectrometer

1995 ◽  
Vol 49 (2) ◽  
pp. 177-180 ◽  
Author(s):  
Martin Hühne ◽  
Ursula Eschenauer ◽  
Heinz W. Siesler
Keyword(s):  
Aqueous Solution ◽  
Fiber Optics ◽  
Near Infrared ◽  
Tunable Filter ◽  
Near Ir ◽  
Infrared Spectrometer ◽  
And Performance ◽  
Contact Free ◽  
Near Infrared Spectrometer

The design and applications of a near-infrared (near-IR) spectrometer with an acousto-optic tunable filter (AOTF) as monochromator and light fiber optics are described. The aim of this spectrometer is rapid product and reaction control via remote sensing and chemometric data evaluation. Its application and performance are illustrated by the determination of the water content of acetone and by the contact-free temperature measurement of an aqueous solution.

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-IR Multiplex Bandpass Spectrometer Utilizing Polymer Filters

1996 ◽  
Vol 50 (10) ◽  
pp. 1246-1252 ◽  
Author(s):  
Michele R. Fischer ◽  
Gary M. Hieftje
Keyword(s):  
Near Infrared ◽  
Ir Radiation ◽  
Filter Materials ◽  
Near Ir ◽  
Polymer Sheets ◽  
Infrared Spectrometer ◽  
Thermoforming Process ◽  
Organic Solutions ◽  
Near Infrared Spectrometer

A simple near-infrared spectrometer is described that utilizes ordinary polymer sheets as near-IR spectral filters. Examples of filter materials include polymethyl methacrylate, polyvinyl chloride (PVC), and organic solutions immobilized in a PVC matrix. The polymers were prepared by using solvent-molding techniques as well as with a thermoforming process. Each filter substance passes multiple bands of near-IR radiation. The performance of the spectrometer is demonstrated in selected quantitative and qualitative near-IR analytical applications. The applicability of the designed multiplex bandpass spectrometer in determining trace levels of water in methanol, dimethyl sulfoxide, and propylene glycol is examined. Additionally, the utility of the spectrometer in the determination of glucose concentration in aqueous solutions is studied.

Rapid and Nondestructive Freshness Determination of Tilapia Fillets by a Portable Near-Infrared Spectrometer Combined with Chemometrics Methods

2020 ◽  
Vol 13 (10) ◽  
pp. 1918-1928
Author(s):  
Hai-Dong Yu ◽  
Si-Min Zuo ◽  
Guanghua Xia ◽  
Xing Liu ◽  
Yong-Huan Yun ◽  
...  
Keyword(s):  
Near Infrared ◽  
Infrared Spectrometer ◽  
Tilapia Fillets ◽  
Near Infrared Spectrometer

Rapid and non-destructive determination of quality parameters in the ‘Tommy Atkins’ mango using a novel handheld near infrared spectrometer

2016 ◽  
Vol 197 ◽  
pp. 1207-1214 ◽  
Author(s):  
Emanuel José Nascimento Marques ◽  
Sérgio Tonetto de Freitas ◽  
Maria Fernanda Pimentel ◽  
Celio Pasquini
Keyword(s):  
Near Infrared ◽  
Quality Parameters ◽  
Infrared Spectrometer ◽  
Near Infrared Spectrometer ◽  
Non Destructive

The Detection of Soil Parameters by Portable near Infrared Spectrometer

2011 ◽  
Vol 128-129 ◽  
pp. 718-726 ◽  
Author(s):  
Yu Fei Li ◽  
Da Cheng Wang ◽  
Dong Yan Zhang ◽  
Da Zhou Zhu
Keyword(s):  
Organic Matter ◽  
Near Infrared ◽  
Ammonium Nitrogen ◽  
Tunable Filter ◽  
Field Analysis ◽  
Soil Parameters ◽  
Calibration Model ◽  
Infrared Spectrometer ◽  
Near Infrared Spectrometer ◽  
Nitric Nitrogen

Soil test is the key-point for formulated fertilization. The traditional chemical analysis methods for estimating soil nutritional parameters were time-consuming. The present aims to use portable acousto-optic tunable filter (AOTF) near-infrared (NIR) spectrometer to measure soil parameters, thus provide basis for field analysis of soil quality. A total of 231 soil samples were collected, Partial least squares (PLS) was used to construct the calibration model between the NIR spectra and the reference values measure by standard chemical methods, including organic matter, pH, ammonium nitrogen, nitric nitrogen, and total kalium content. Results showed that the prediction of organic matter and pH had high correlation (R=0.8745, R=0.8594, respectively), the prediction of ammonium nitrogen and total kalium content were acceptable (SEP%=23.2595%, 10.1516%), and the calibration model for nitric nitrogen had the worst performance. The present study indicated that portable AOTF-NIR spectrometer could be used to measure the nutrient parameters of soil.

Determination of the Stray Light Levels in a Dispersive Near-Infrared Spectrometer with Trichloromethane

2000 ◽  
Vol 54 (12) ◽  
pp. 1759-1766 ◽  
Author(s):  
Kenneth W. Busch ◽  
Olusola O. Soyemi ◽  
Dennis Rabbe ◽  
Marianna A. Busch
Keyword(s):  
Near Infrared ◽  
Stray Light ◽  
Light Levels ◽  
Infrared Spectrometer ◽  
Near Infrared Spectrometer
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