Near Infrared Spectroscopy for Surface Analysis

Near-infrared spectroscopy (NIR) has become one of the most popular analytical techniques in recent decades. It employs a light source that emits light at a certain wavelength (often 800-2500nm), allowing users to get a complete picture of the organic makeup of the item under investigation. Near infrared spectroscopy is faster, chemical-free, easy to use, and non-toxic than most other analytical procedures (such as gas chromatography and high performance liquid chromatography) and classic chemical methods (such as Kjeldahl, Soxhlet). Destructive. Alfa Chemistry can help you define and identify difficult sample materials using near-infrared spectroscopy analysis.

Near Infrared Spectroscopy of Alfa Chemistry

NIR spectroscopy is a useful secondary analysis technique for determining the physical properties of a wide range of important chemical compounds and chemicals, as well as characterization and identification of complicated sample materials. It has multiple measurement modes: reflection, transflective or transmissive. The NIR spectrum offers a wealth of information on the chemical and physical features of the sample, but extracting it requires considerable work. We employed a chemometric data analysis algorithm since NIR is made up of overlapping overtones and originates in the mid-infrared range.

Fig 1. Typical NIR spectra of biological materials. (a) Ground and (b) whole wheat, showing moisture and protein absorption bands.. (Manley M, et al. 2014)

Alfa Chemistry can also characterize the optical characteristics of materials using UV-VIS-NIR spectroscopy. Materials' color, transmittance, and reflectivity are all subject to change over time. Optical surface analysis is commonly used to examine material changes as a comparison of different aging processes. The properties can be assessed in several wavelength ranges depending on the material and application. We undertake optical evaluations of material attributes in the ultraviolet, visible, and infrared wavelength ranges using a variety of spectroscopy methodologies. Color, gloss, transmittance, haze, yellowness index (YI), and reflection are all common evaluation parameters. We will send a report on the test procedures and findings after the test is done.

The main features of our NIR spectroscopy include:

• Flexible sample display
• Multi-component analysis
• Medium sensitivity
• Representative sampling (10～100 g material)
• The large dynamic range of sample thickness
• All sample types (any convenient sample size or shape, from transparent to completely opaque)
• Non-invasive, non-destructive
• Small absorption coefficient
• (Ultra) fast measurement (< 1 minute)
• Good signal-to-noise ratio (10⁵: 1)
• Mature technology

For further information, please contact us.

Reference

• Manley M, et al. (2014). "Near-infrared Spectroscopy and Hyperspectral Imaging: Non-Destructive Analysis of Biological Materials." Chem. Soc. Rev. (43): 8200-8214.