Headspace Gas Analysis

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

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