| 摘要 |
A method and apparatus for detecting, with a high degree of reliability and precision, a two dimensional position of any defects that might be present in a microporous hollow fiber membrane module (10) as manufactured. Detection of defects is carried out in a dark chamber (42) in which the module (10) to be tested is placed. Air carrying fine airborne particles having a particle size larger than the pore size of the micropores of the hollow fibers is forced to flow through the module. A laser beam (54) is projected closely adjacent to the end face (22) of the module to irradiate any particles that have passed the defects. Upon irradiation, the microscopic particles scatter the incident beam and are visualized by scattered light. The light intensity of the visualized scene of particles is magnified by an image intensifier (64) and a video camera (68) generates video signals of the intensified image. The video signals are processed by an image processor (70) which computes and identifies the two dimensional position of the defects.
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