Photoionization measurement device and method

The invention relates to a photoionization measurement device and method. The photoionization measurement device comprises an ionization chamber, a light-emitting assembly, a measurement chamber and a detection assembly. The ionization chamber is configured to enable the light emitted by the light-emitting assembly to enter the ionization cavity so as to ionize the gas to be detected in the ionization cavity; the measurment chamber is provided with an outlet hole channel penetrating through the measurement chamber, and the outlet hole channel is communicated with the ionization cavity so that the ionized gas to be measured can flow out; and the detection assembly comprises a collecting electrode and a bias electrode which are electrically connected, and is used for detecting the ionized gas to be detected in the outlet hole channel. Therefore, the device has selectivity, the gas to be detected can be measured in a targeted manner, and the measurement accuracy of the gas to be detected is improved. 本申请涉及一种光离子化