Meaning
Optical analysis techniques measure the interaction of light with molecular bonds to identify the chemical composition of a substance. Applying near infrared spectroscopy allows for the rapid identification of materials and the measurement of moisture or fat content. The system shines light in the 700 to 2500 nanometer range onto a sample and analyzes the wavelengths that are reflected or absorbed.
It is a powerful tool for incoming raw material inspection and real-time process monitoring.
Spectral Reading
Different chemical bonds, such as carbon-hydrogen or oxygen-hydrogen, absorb energy at specific frequencies. Near infrared spectroscopy creates a unique profile that acts as a chemical fingerprint for the material. Advanced software then compares this profile against a library of known substances to confirm purity or identify contaminants.
Photon Absorption
Intensity of the absorbed light is directly related to the concentration of the target molecule in the sample. While near infrared spectroscopy is less sensitive than some laboratory methods, it is much faster and requires no chemicals for testing. This makes it ideal for use on the production floor where quick decisions are necessary.
Chemical Detection
Multi-component analysis can be performed in a single scan, measuring moisture and polymer additives simultaneously. Near infrared spectroscopy reduces the need for expensive and time-consuming wet chemistry tests. It provides a defensible method for ensuring that a production batch meets all its chemical specifications before it is released.
