Patent ID: 9625391
Date: 2017-04-18
CPC Classifications: G01J,G01N,G02B

Claim:
1. A LIBS measuring tube for dipping vertically into a material to be analyzed that is moving in a horizontal stream wherein the measuring tube extends vertically, is hollow inside and is open at least at a lower end, so that a bottom edge is formed at the lower end, at an upper end, the measuring tube has an inlet for coupling in a laser beam and an outlet for coupling out an emission spectrum, the measuring tube is constructed such that, in the measuring tube, the laser beam is focused on the material in such a way that a plasma of the material is generated inside the measuring tube by the laser beam without occurrence of any additional scattering or deflection and an emission spectrum of the material passes through an interior of the measuring tube to the outlet, where it is coupled out, and scrapers disposed to be displaced vertically against a focusing tube bear annularly on an inside wall and an outside wall of the focusing-tube, so that material clinging to the inside and outside of the focusing tube is scraped off by a relative movement of the focusing tube against the scrapers in a lower region.