Optical distance measurement of inner walls for e.g. measuring pipe wall strength

摘要

The measurement involves a device, where a source (a) emits an optical signal (b) whose beam path is bent (c,d,g) one or more times. The measurement head (f) is an optical arrangement remote from the sensor body (o), e.g. a cylindrical tube (e), and the transmitted beam is deflected radially outward perpendicularly from the measurement head. The beam (b) is fed to the measurement point (j) from which it is reflected.The path of the reflected beam (k) is deflected (l) and an image formed from it by a suitable optical device (m) position selectively onto an optoelectronic receiver (n), e.g. a CCD or PSD. A resulting electrical signal corresponding to a measurement value in the measurement region according to the triangulation principle, is prepared by a processor (p) for display or fed to a production line via an interface. The sensor head is fed into the measurement object, e.g. a small pipe (h).