公开(公告)号：US20240094133A1

公开(公告)日：2024-03-21

申请号：US18255392

申请日：2021-12-02

Applicant: DTE EHF.

Inventor： Sveinn Hinrik GUDMUNDSSON ,  Kristjan LEOSSON

IPC: G01N21/71 ,  G01N33/205

CPC classification number: G01N21/718 ,  G01N33/205 ,  G01N2021/151

Abstract: A modified method and apparatus for measuring elements in a liquid metal or alloy sample (23) with Laser Induced Breakdown Spectroscopy (LIBS). The apparatus comprises a pulsed excitation laser (1) and an instrument head (6) comprising a laser path channel (10), laser excitation optics (2), receiving optics for receiving emission from a plasma (3) created by the interaction of the laser (1) and the sample (23), an open-bottom chamber (5) extending upwardly from a flat bottom surface (7) of the instrument head (6), the laser path channel (10) extending to said chamber (5), and preferably a gas channel (12) for feeding gas to the open-bottom chamber (5). The laser (1) and laser excitation optics (2) are configured such that when the instrument head (6) is at a distance from a sample surface in the range of 1-10 mm, the focal point of the pulsed excitation laser is beneath the sample surface at a distance which is more than one Rayleigh length of the focused excitation laser beam.

公开(公告)号：US20220236247A1

公开(公告)日：2022-07-28

申请号：US17615572

申请日：2019-05-31

Applicant: DTE EHF.

Inventor： Sveinn Hinrik GUDMUNDSSON ,  Jon MATTHIASSON ,  Kristjan LEOSSON

IPC: G01N33/205 ,  G01N21/71 ,  G01J3/443

Abstract: A non-contact, non-immersive method and apparatus are provided for accurately measuring quantitatively one or more elements in liquid metal or alloy samples using laser-induced breakdown spectroscopy (LIBS). The method is particularly useful for process and/or quality control within the metallurgy industry for accurately and very quickly measuring minor component or impurity elements in liquid metal in the production process, without touching the liquid metal and without the need for cooling and solidifying samples for analysis. In the method and apparatus a pre-determined distance is dynamically maintained between emission receiving optics and the surface of a liquid sample being analysed and the instrument does not come in contact with the liquid metal surface. Liquid samples are heated and/or maintained at a desired temperature. For many elements, values for limit-of-detection, measurement repeatability and accuracy about or below 1 ppm are achieved using this method.