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RED-Wave-NIRX-SR Spectrometer

Range 900-2300nm


StellarNet’s high performance InGaAs extended range spectrometers cover the NIR wavelength range from 0.9-2.3μm in one unit. The spectrometers are exceptionally robust with no moving parts and are packaged in small rugged metal enclosure (2.75” x 4” x 6”) for portable, processes, and lab applications. The InGaAs detector is a Sensors Unlimited linear photo diode array with 512 pixels (1024 optional) 25μm by 250μm tall to provide best signal performance. The detector has an integrated two-stage thermo electric cooler (TEC) maintained at –20 °C, stabilized within +/-0.1°C. The RED-Wave-NIRX-SR-InGaAs spectrometers use single strand SMA 905 fiber optic input.

NIR applications include chemical ID and moisture analysis, SpectroRadiometry and optical power measurements, laser characterization, microsensor applications, and thicker thin-film measurements.

RED-Wave-NIRX-SR Sample Spectra

 

RED-Wave-NIRX-SR InGaAs 512 pixels spectrum showing spectral characteristics of Tylenol, Excedrin PM, and Ibuprofen tablets.

Often NIR spectroscopy is used as a non-contact method to distinguish between coatings.

 

RED-Wave-NIRX-SR spectrometer with SL1-CUV tungsten halogen lamp with integrated cuvette holder, and a F1000-VIS-NIR

1000um diameter fiber optic cable measuring the NIR absorption of methanol in water.

 

 

RED-Wave-NIRX-SR spectrometer with RFX1 reflectance fixture plotting NIR 2nd derivative spectra of soy products with varying fat content.

 

Lens, filters, films, coatings, and plastics sometimes will have interesting characteristic fringe patterns in the far NIR. Be sure to test your samples!

RED-Wave-NIRX-SR spectrometer with SL1 tungsten halogen lamp, TXF-4 transmission fixture, and two F600-VIS-NIR 600um diameter

fiber optic cables measuring the transmission through PTFE and Lexan plastics. Above SpectraWiz spectroscopy software displays 2nd derivative spectra in real time.

 

RED-Wave-NIRX-SR spectrometer with SL1-CUV tungsten halogen lamp with integrated cuvette holder, and a F600-VIS-NIR 600um

diameter fiber optic cable measuring the NIR absorption of oil and alcohol solutions.

 

Fats and oils constitute the main source of energy and essential fatty acids in the human diet. Additionally, fats and oils function

as lubricants in equipment and carriers of fat-soluble vitamins and pigments. Exploring the NIR past 1700nm allows us to identify some

of the more important spectral feastures of fats and oils. Above is a spectrum of the StellarNet low dark Noise NIRX (900-2300nm)

showing important spectral features past 1700nm such as Fatty Acids absorbance bands at 1750nm and oil saturation absorbance at 2100nm.

 

Coffee in addition to many other agricultural products shows very important spectral characteristics past 1700nm. Commercial coffee is mainly made up of two main blends, Arabica and Robusta. Main distinguishing absorptions can be found from water content (1466nm and 1962nm) and lipids. NIR spectroscopy can be used for classification as well as blending. Also, caffeine and dry matter content can be determined. For food quality control and identification of adulterants it is very important to test all parts of the NIR region.

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