Instruments for Chemistry Applications

StellarNet miniature research grade spectrometers allows for low cost measurements in the UV-VIS-NIR wavelength ranges. These instruments can measure species absorption, emission, fluorescence, transmission, concentration, and color, using the free SpectraWiz® operating software for any version of Microsoft Windows right on your desktop or portable notebook computer. The BLACK-Comet series concave grating spectrometers cover wavelength ranges 190-1100nm in four different configurations. The superior concave grating and silicon based CCD allow for accurate and reliable measurements at an unmatched cost. The RED-Wave NIR InGaAs series spectrometers cover the near infrared wavelength regions from 900-2300nm with either 512 or 1024 element cooled photodiode arrays. StellarNet's spectrometers are ruggedized, durable, and the perfect instrument for any lab or field application.

Dip probes and flow cells are available to measure absorbance, color, and analyze concentrations of liquids for in process and kinetics studies. Cuvette holders and integrate light source cuvettes holders are also available.

- Dip Probe – fast, easy sampling of liquids.

- ATR probes available for dark, viscous liquids

- Cuvette – 1cm standard pathlengths

- Adjustable fixtures available for longer cells

- Integrated cuvette/light sources

- Compact, cost-effective alternative

The SpectraWiz Spectroscopy Software is included for real-time spectral analysis, episodic spectral capture, ChemWiz concentration analysis, and has applications for Colorimetry, Radiometry and OES spectroscopy. Look for StellarNet concave grating based fluorescence systems for your next fluorimetry application!

BLACK-CometChemWiz Concentration Analyzer

- Application panel works with live spectra to allow concentration calibration using single wavelength PLS.

- Load previously developed PLS chemical calibrations for concentration display of unknown samples.

- Episodic capture for kinetics and time series analysis

- Performs single wavelength linear PLS calibrations.

- Ideal for in-line batch and on-line process monitoring

 Fluorescence Measurements

- Low stray light concave gratings optics allow Deep UV measurements

- Concave gratings provide uniform resolution over 190-1100nm

- LED excitation source for low cost alternative to laser or bandpass filters

2nd Derivative data using SpectraWiz of various plastics, used for identification in recycling plants

DWARF-Star NIR SpectrometerChemWiz Concentration Analyzer

SpectraWiz Software displaying a time series increase of NIR water absoprtion bands.

The instruments are constructed in a small rugged enclosure, with a fiber optic SMA connection on the front panel. Portable spectrometers have an easy to use plug and play interface with USB-2 connection.

StellarNet’s Low Cost UV-VIS Spectrometer system is composed of the BLACK-Comet research grade concave grating spectrometer, a SL5 high stability light source with integrated cuvette holder, and an optical coupling fiber. Various Spectrometer configurations allow for extended wavelength ranges from 200-1100nm and resolutions to 0.75nm. The BLACK-Comet utilizes aberration corrected optics allowing for enhanced UV sensitivity, reduced stray light, uniform resolution, and superb spectral imaging. The SL5 lamp combines deuterium and tungsten halogen light to form a single optical path with individual bulb power control and front and rear panel shutter control. Spectral acquisition and analysis is made easy with SpectraWiz®, StellarNet’s powerful spectroscopy software package that gives the user complete control of their UV-VIS absorption measurements.

- Concave grating provides high sensitivity

- Consistent resolution throughout wavelength range (due to flat field created by special concave grating)

- No mirrors for lowest possible stray light

- Extremely rugged with no moving parts

- Shock-proof durability and permanent alignment

- Miniature size, low cost, portable instrumentation

- Battery pack options for field measurements

- Simple USB2 interface to notebook & desktop PCs

StellarNet’s newest NIR spectrometer, the DWARF-Star, is small, robust, and equipped with high performance InGaAs detector array for the 900-1700nm wavelength range and achieves resolving resolutions to 1.25nm. The DWARF-Star features no moving parts and is packaged in a small rugged metal enclosure (5”x3”x2”) for portable, process, and OEM applications. Advancements in electronic and optical design have allowed for size reduction never before achieved in a NIR spectrometer.

SpectraWiz software interface displaying raw NIR reflectance spectra of dietary supplement powders with inset multivariate calibration model

Each DWARF-Star includes free SpectraWiz® Software and a developer’s toolbox of source codes, customizable demo programs, and full spectroscopy applications in LabVIEW, Visual Basic, Delphi Pascal, and MS Visual C. High speed spectral data acquisition with advanced features, such as time series analysis and episodic data capture with rapid sample logging are standard features. Post processing techniques such as baseline correction, data smoothing, and spectral derivatives are included. Additionally, add-on chemometrics packages are available for complete multivariate calibration, analysis, and run-time with the DWARF-Star.

Introduction into Near-Infrared Spectroscopy

The near-infrared (NIR) region of the spectrum extends from the upper wavelength end of the visible region at about 770nm to about 2500nm (13,000 to 4,000cm-1. StellarNet RED-Wave-NIR and NIRX-SR model spectrometers extend to 2300nm capturing some of the most valuable absorption bands in the near infrared. These bands are overtones or combinations of fundamental stretching vibrational bands. The bonds involved are usually C-H, N-H, and O-H. Because the bands are overtones or combinations their molar absorptivities are low. Quantitative determination of species, such as water, proteins, low molecular weight hydrocarbons, and fats in product s of the agriculture, food, petroleum and chemical industries. Both diffuse reflection and transmission measurements are used, although diffuse reflection is by far the most widely used. StellarNet offers TXF transmission fixtures and RFX reflection fixtures to facilitate these measurements.