Method for performing small-angle longitudinal wave detection by using equivalent test block

The invention discloses a method and a system for performing small-angle longitudinal wave detection by using an equivalent test block, and belongs to the technical field of nondestructive testing. The first transverse through hole group and the second transverse through hole group are respectively arranged on the two sides of the same test block body, and the scales are arranged on the upper end surface and the lower end surface along the horizontal direction, so that scanning baseline calibration, reference sensitivity determination and curve making can be completed by only one test block, and the test block is convenient to operate and carry. The plurality of transverse through holes in the first transverse through hole group and the second transverse through hole group are respectively located at different vertical heights of the test block body, and when detection is carried out from the upper end face or the lower end face, detection of multiple depths can be carried out, so that the detection requireme