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Sunday, September 16, 2018

METHODS TO MEASURE THE CONCENTRATION OF A GAS

  • The Rayleigh refractometer utilises the refractive index of a gas to calculate its concentration.
  • Thermal conductivity is used in katharometers. In these devices, the cooling of a wire causes a change in resistance proportional to gas concentration.
  • Solubility is employed in devices such as rubber strips when an increase in length accompanies gas absorption.
  • Light emission features in the Raman light scattering measurement device.
  • Both infrared and ultraviolet absorption are used in gas concentration measurement.

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