NON-IMMERSIBLE METHOD AND DEVICE FOR QUANTITATIVE ANALYSIS OF LIQUID METALS AND ALLOYS Russian patent published in 2023 - IPC G01J3/443 G01N21/71 

FIELD: measuring equipment.

SUBSTANCE: invention relates to a method and a device for determination of a content of elements in samples of liquid metal or alloy. A non-contact non-immersible method for measurement of amount of one or more elements in a sample of liquid metal or alloy contains stages, at which: a sample of liquid metal or alloy to be analyzed is obtained, the specified sample is maintained or placed in a sample container, which is essentially open from above, the sample is heated or maintained at the required temperature or at a temperature above the required, a measuring head and/or the sample container is placed so that the measuring head is above a surface of the sample. In this case, the measuring head contains exciting optics, which is connected to a laser, receiving optics for receiving radiation from the sample, and a chamber open from below, providing plasma retention and stable conditions of a medium, through which exciting optics directs a laser light beam, while the measuring head is equipped with a distance sensor. Receiving optics is positioned at a predetermined distance of about 5-100 mm, preferably about 10-50 mm from the surface of the sample, so that to collect radiation from a certain part of a plasma torch. Moreover, receiving optics is positioned at an angle to the surface of the sample in the range of about 30-75°, and, using the distance sensor, a distance to the surface of the sample is measured, and receiving optics or the sample container is automatically moved to install receiving optics at a predetermined distance from the surface of the sample. A jet of inert gas is directed through a gas channel into the specified chamber open from below, one or more laser pulses are emitted to the sample by means of exciting optics, emitted light radiation from the sample is received by means of receiving optics and transmitted to a detector to register spectral information of detected light radiation, one or more selected radiation peaks are compared with calibration values to quantify one or more elements.

EFFECT: increase in a detection limit, measurement convergence, and error to or below 1 ppm.

29 cl, 8 dwg