Method and device for measuring physical characteristic of target surface

TLDR: In this paper, a search part is inserted into the inside surface of a pipe, such as hydraulic brake cylinder, to make the rapid and highly reliable surface inspection possible by radiating electromagnetic radiations to the portion to be inspected of an object surface and the portions existing in the adjoining positions on both sides thereof and comparing the intensities of the reflected from both.

Abstract: PURPOSE:To make the rapid and highly reliable surface inspection possible by radiating electromagnetic radiations to the portion to be inspected of an object surface and the portions existing in the adjoining positions on both sides thereof and comparing the intensities of the radiations reflected from both. CONSTITUTION:A searching part 13 which is movable in the arrow A direction is inserted into the inside surface of a pipe 12 such as hydraulic brake cylinder. Light from a light source 19 is radiated to a parabolic mirror surface 16 by way of a lens 20 to form a circular ring-foam focus on the surface 11. The reflected light is imaged on a photo detecting array 22 by way of the mirror surface 16 and spectroscope 24. If here there are flaws such as porous concave pits 27, they are detected as a region differing in intensity on the array 22. The intensities of the reflected light from these flawed portions and other normal surface are input as electric signals 28 from the detector array 22 to an automatic processing unit 29. In the unit 29, comparative operations are accomplished by the specified circuits, thus the surface inspection may be performed rapidly and highly reliably.