Why using a purged spectrometer?
Deep UV light is very much absorbed by air. These signals are often very weak and we want to avoid UV absorbance by air by putting the spectrometer in a vacuum or gas chamber, or flush the optical bench of the spectrometer with gas (for example Argon or Nitrogen). To flush a spectrometers Avantes equips the AvaSpec spectrometer (for example StarLine AvaSpec-ULS2048L-USB2 or SensLine AvaSpec-ULS2048X16-USB2) with flush connectors. Coupling these purge connectors to the gas and creating a flow, “pushes” the air out of the optical path and therefor avoids the UV absorbance of the signal by air. Now the UV emission will give a much stronger signal.