Laser-based headspace analysis is a non-destructive and non-invasive technique based on Tunable Diode Laser Absorption Spectroscopy (TDLAS).
The principle underlying the TDLAS measurement is based on the Beer-Lambert Law, stating that light transmitted through the headspace of a container at a given wavelength is a function of the concentration of the headspace gas that is absorbing the incident light.
Xepics has manufactured its own complete laser system in which a VCSEL diode, at a wavelength optimized for the measurement of a certain gas, transmits the light beam through the headspace region of the container; the light is then received by a detector after passing through the container.
Light wavelength:
- Oxygen monitoring: λ = 760 nm
- Residual moisture level: λ = 1854 nm
- Carbon dioxide concentration: λ = 2000 nm
In our system the absorbance of target gas is measured using Frequency Modulation Spectroscopy which is a robust market standard and provides both a heightened sensitivity and an improved noise rejection characteristic over direct absorption.
Xepics headspace analyzers are available both in laboratory and fully automated scale; Headspace Analysis can also be combined with Visual Inspection and Container Closure Integrity into complete equipment
