Near-infrared (NIR) light sources penetrate samples deeper and greatly reduce noise from fluorescence and other background lights, as compared to visible light sources. Both Raman and NIR spectroscopy are nondestructive optical analytical techniques. NIR spectroscopy is based on absorptions or reflections in the NIR spectral region by molecular bond vibrations from the sample when illuminated by a white light source. Raman spectroscopy is also based on the molecular bond vibrations. In contrast, a Raman spectrum is dispersed stokes-shifted photons scattered from the sample when illuminated by a singlewavelength laser. Raman spectroscopy is a powerful technique for chemical identification that can be used both qualitatively and quantitatively. It has been deployed successfully in many fields, such as pharmaceuticals, medical analysis, food production, forensics, and others. Although it typically offers higher specificity and is gaining popularity, NIR spectroscopy is much faster, suitable for probing bulk material and currently used in many industries. An instrument simultaneously combining both Raman and NIR would offer maximum analytical power and flexibility.

Product and Application Notes

Simultaneous NIR and Raman Measurement System