US 9,797,835 B2Granted

In-situ on-line detection device and method for long-distance metallurgical liquid metal component

AssigneeShenyang Institute of Automation, Chinese Academy of Sciences

InventorsLanxiang Sun, Haibin Yu, Yong Xin, Lifeng Qi, Yang Li, Zhibo Cong

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Abstract

An in-situ on-line detection device and detection method for a long-distance metallurgical liquid metal component. The detection device comprises a front-end high-temperature resistant probe, a middle-end optical sensing device and a back-end control platform, wherein the head of the front-end high-temperature resistant probe is placed in a liquid metal, the tail thereof is coaxially connected to the middle-end optical sensing device, and an optical window is arranged in the connection position; and the middle-end optical sensing device is connected to the back-end control platform through a signal line. The detection device and detection method can provide a timely and valid message for quality control and a melting end, so that the detection time is greatly shortened, the detection distance can he adjusted extensively, the measurement result is accurate, and it can be achieved to measure components that are difficult to measure such as carbon, sulfur, phosphorous, etc.

Claims15

Dependent claims

An in-situ online detection device for a long-distance metallurgical liquid metal component, comprising:

a front-end high-temperature resistant probe that comprises a head designed for placement in liquid metal, said probe further comprising a tail section;
a middle-end optical sensing device connected to the tail section and comprising a remote signal collecting module;
an optical window provided at an interface region of the tail section and middle-end optical sensing device;
a laser generating module;
a back-end control platform;
and wherein
the tail section is coaxially connected to the middle-end optical sensing device, and the middle-end optical sensing device is connected to the back-end control platform through a signal line, and
said middle-end optical sensing device comprises a remote beam expanding and focusing module that is arranged coaxially in an axis direction in which the laser generating module emits one or more laser beams;
and
a first laser beam reflecting mirror is arranged on an optical axis of an emergent direction of the remote beam expanding and focusing module and forms an angle of 45° with the optical axis thereof;
a second laser beam reflecting mirror is arranged on an optical axis of an incident direction of the remote signal collecting module and forms an angle of 45° with the optical axis thereof;
and
a connecting line of the centers of the first laser beam reflecting mirror and the second laser beam reflecting mirror is perpendicular to the axes of the optical axis of the emergent direction of the remote beam expanding and focusing module and the optical axis of the incident axis direction of the remote signal collecting module;
said remote beam expanding and focusing module comprises a first movable base and a diverging lens and a converging lens which are coaxially arranged on the optical axis of the emergent direction of the laser generating module;
said first movable base being adjustable on the optical axis of the emergent direction of the laser generating module;
said diverging lens being arranged in the first movable base perpendicular to the optical axis of the emergent direction of the laser generating module;
and
said converging lens being arranged between the first movable base and the first laser beam reflecting mirror and perpendicular to the optical axis of the emergent direction of the laser generating module.

15 more elements

An in-situ online detection method for a long-distance metallurgical liquid metal component, comprising the following steps:

placing a head of a front-end high-temperature resistant probe in liquid metal;
and charging inert gas through an air inlet pipe of the high-temperature resistant probe to form a closed inert gas environment;
emitting a distance measuring laser by a laser distance measuring module;
after the distance measuring laser passes through a first laser beam reflecting mirror and to a second laser beam reflecting mirror, irradiating the distance measuring laser on a liquid metal surface;
measuring position information of the liquid metal surface;
and feeding the same back to a back-end control platform;
performing focusing adjustment on a first movable base of a remote beam expanding and focusing module and a second movable base of a remote signal collecting module by the back-end control platform through use of the position information of the liquid metal surface that is fed back by the laser distance measuring module so that the focal position, on which the laser focuses, for exciting plasma from the liquid metal, and a collection position of remote signals coincide on the liquid metal surface;
receiving a laser generating signal of the back-end control platform by a laser generating module;
emitting at least one laser beam;
after the at least one laser beam passes through the remote beam expanding and focusing module, irradiating the at least one laser beam on the first laser beam reflecting mirror;
enabling the at least one laser beam, reflected off the first laser beam reflecting mirror, to reflect off the second laser beam reflecting mirror to the liquid metal surface through the inert gas environment of the front-end high-temperature resistant probe to produce plasma signal light;
transmitting the generated plasma signal light to the remote signal collecting module through the inert gas environment of the front-end high-temperature resistant probe;
forming parallel plasma signal light through a paraboloidal reflecting mirror and a hyperboloidal reflecting mirror in the remote signal collecting module;
and transmitting the same to an optical fiber coupling module through a light splitting piece;
and
further transmitting the parallel plasma signal light that passes through the optical fiber coupling module through an optical fiber end to an optical fiber spectrometer for performing light signal collection and photoelectric conversion;
and feeding photoelectric conversion data to the back-end control platform.

14 more elements

Dependencies are inferred from the claim text.

Facts

Application: 14/898,600Filed 28 Nov 2013
Priority: CN 2013 1 030343915 Jul 2013
Published: US 2016/0131581 A112 May 2016
Granted: 24 Oct 2017
Term ends: Not estimatedThe source records don’t support an estimate.

Classification13 codes

G01N 21/63
Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light: optically excited
G01B 11/14
Measuring arrangements characterised by the use of optical techniques: for measuring distance or clearance between spaced objects or spaced apertures
G01N 21/21
Systems in which incident light is modified in accordance with the properties of the material investigated: polarisation-affecting properties
G01N 21/718
Thermally excited: laser microanalysis, i.e. with formation of sample plasma