Patent ID: 9006666
Filing Date: 2015-04-14
Classification: G01N,G01T

Abstract:
1. A positron tomography imaging apparatus for a multiphase flow in an oil pipeline, comprising at least one set of probes configured to produce positron and electron annihilation and detect time-coincidence gamma ray events, wherein each set of probes comprises a pair of parallel gamma-ray detector arrays, a positron radioactive source and a radioactive source shield, wherein the pair of parallel gamma-ray detector arrays are configured to be respectively disposed on both sides of an oil pipeline under detection and perpendicular to an axial direction of the oil pipeline, the positron radioactive source configured to be located between the oil pipeline and a row of gamma-ray detector arrays in the pair of parallel gamma-ray detector arrays and parallel to the pair of parallel gamma-ray detector arrays, the radioactive source shield configured to undertake a gap shielding of the positron radioactive source in the axial direction of the oil pipeline, the pair of parallel gamma-ray detector arrays in each set of probes configured to determine a plurality of detection intervals, each of which is determined by a pair of gamma-ray detectors, wherein an average absorption coefficient of gamma-ray is acquired from each detection interval such that average absorption coefficients of different detection intervals acquired simultaneously may be used to reconstruct a tomography image of fluid.