What is the ChemWiz Concentration Predictor?

Nov 10, 2017 | Glossary of Spectroscopy Terms, StellarNet Definition

The ChemWiz Concentration Predictor makes use of the Beer-Lambert law (see absorption spectroscopy) to predict the concentration of unknown samples. It can be accessed by clicking “Applications” > “ChemWiz Methods,” “Chem,” or the chemistry glassware icon. By...

What is light Intensity/Absolute Intensity/Irradiance?

Nov 10, 2017 | Glossary of Spectroscopy Terms, Properties of Light, StellarNet Definition

What is Light Intensity, Absolute Intensity, and Irradiance? Light intensity is commonly used to describe the amount of optical power falling on a given area. In spectroscopy and radiometry, the more precise term for this quantity is irradiance. Irradiance is defined...

What is the Spectrometer’s Baseline Offset?

Nov 10, 2017 | Detectors, Electronics, Glossary of Spectroscopy Terms

The baseline offset is the number of counts generated by the detector when there is no light. Several sources of noise are always present, so it is impossible to have no counts. The main components of baseline offset are electronic offset, dark current, and readout...

LED and Laser Power Limit for Integrating Spheres

Nov 10, 2017 | Frequently Asked Questions, Integrating Spheres

Question: I would like to measure power and wavelength of various lasers and LEDs. I guess there must be a limit to how high power the integrating spheres (IC2 or IS6) can take. Do you know? SpectraWizard’s Answer: This question depends on if you are asking how...

Technical Note: Sample Damage in Raman Spectroscopy

Oct 12, 2017 | Raman

Raman spectroscopy is utilized in a variety of ways, ranging from the characterization of protein-nucleic acid interactions1 to analyzing dyes in ancient artwork2. When dealing with sensitive samples, a common issue one runs into is damaging the sample. Laser powers...

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