Discharge ionization detector

The invention discloses a discharge ionization detector, which comprises an arc-shaped electrode assembly, a detector main body and a parallel electrode assembly, a discharge chamber is arranged at one end of the detector main body, an ionization chamber is arranged at the other end of the detector main body, the volume of the discharge chamber is more than five times that of the ionization chamber, and the volume of the ionization chamber is less than 0.5 ml; an electrode of the arc-shaped electrode assembly is positioned in the discharge chamber; the parallel electrode assembly is positioned in the ionization chamber and is electrically connected with an external signal acquisition circuit; an air inlet hole I, an air inlet hole II and an exhaust hole 11 are further formed in the detector main body; the gas inlet I is communicated with the discharge chamber 4, and discharge gas is introduced; the gas inlet hole II and the gas outlet hole are both communicated with the ionization chamber, the gas inlet hole