Discharge ionization detector

A discharge ionization detector (DID) is a type of detector used in gas chromatography. A discharge ionization detector (DID) is a type of detector used in gas chromatography. A DID is an ion detector which uses a high-voltage electric discharge to produce ions. The detector uses an electrical discharge in helium togenerate high energy UV photons and metastable helium which ionizes all compounds except helium. The ions produce an electric current, which is the signal output of the detector. The greater the concentration of the component, the more ions are produced, and the greater the current.