Device and method for measuring total cross-sectional phase fraction of multiphase flow based on ray coincidence measurement

A method, comprising:

• 1) disposing a plurality of devices in a circumferential direction of a fluid pipe under test, wherein each of the devices comprises a scintillation crystal and a detector, the scintillation crystal is coupled to the detector, and the scintillation crystal comprises lutetium-176;
• aligning the scintillation crystal of each device with the fluid pipe, and disposing the scintillation crystal between the fluid pipe and the detector;
• 2) decaying the scintillation crystal to emit intrinsic rays;
• 3) allowing the intrinsic rays to pass through the fluid pipe under test, and detecting, by the detector, a starting point and an end point of the intrinsic rays, and converting optical signals of the intrinsic rays, by the detector, into electrical signals;
• 4) acquiring corresponding lines of responses according to the intrinsic rays produced by each decay and transmission paths thereof;
• and
• 5) finding out all effective lines of responses and calculating a mass fraction of a multiphase fluid based on an energy and path of the lines of responses.