公开(公告)号：CZ285316B6

公开(公告)日：1999-07-14

申请号：CS198190

申请日：1990-04-20

Applicant: UNIV LEHIGH

Inventor： KIM YONG W

IPC: G01J3/443 ,  G01J3/02 ,  G01J3/04 ,  G01J3/18 ,  G01J3/28 ,  G01N21/17 ,  G01N21/69 ,  G01N21/71 ,  G01N21/73

Abstract: A method and apparatus for in-process transient spectroscopic analysis of a molten metal, wherein a probe containing a pulsed high-power laser producing a pulsed laser beam having a substantially triangular pulse waveshape is immersed in the molten metal and irradiates a representative quantity of the molten metal. The pulsed laser beam vaporizes a portion of the molten metal to produce a plasma plume having an elemental composition representative of the elemental composition of the molten metal. Before the plasma plume reaches thermal equilibrium shortly after termination of the laser pulse, a spectroscopic detector in the probe detects spectral line reversals, as caused by absorption of radiation emitted by the hotter inner portion of the plasma plume to relatively coller outer portions of the plasma plume, during a short first time window. Thereafter, when the afterglow plasma is in thermal equilibrium, a second spectroscopic detector also in the probe performs a second short time duration spectroscopic measurement. A rangefinder measures and controls the distance between the molten metal surface and the pulsed laser.

公开(公告)号：AT170627T

公开(公告)日：1998-09-15

申请号：AT90907995

申请日：1990-04-20

Applicant: UNIV LEHIGH

Inventor： KIM YONG W

IPC: G01J3/443 ,  G01J3/02 ,  G01J3/04 ,  G01J3/18 ,  G01J3/28 ,  G01N21/17 ,  G01N21/69 ,  G01N21/71 ,  G01N21/73

Abstract: A method and apparatus for in-process transient spectroscopic analysis of a molten metal, wherein a probe containing a pulsed high-power laser producing a pulsed laser beam having a substantially triangular pulse waveshape is immersed in the molten metal and irradiates a representative quantity of the molten metal. The pulsed laser beam vaporizes a portion of the molten metal to produce a plasma plume having an elemental composition representative of the elemental composition of the molten metal. Before the plasma plume reaches thermal equilibrium shortly after termination of the laser pulse, a spectroscopic detector in the probe detects spectral line reversals, as caused by absorption of radiation emitted by the hotter inner portion of the plasma plume to relatively coller outer portions of the plasma plume, during a short first time window. Thereafter, when the afterglow plasma is in thermal equilibrium, a second spectroscopic detector also in the probe performs a second short time duration spectroscopic measurement. A rangefinder measures and controls the distance between the molten metal surface and the pulsed laser.

公开(公告)号：CS9001981A3

公开(公告)日：1992-01-15

申请号：CS198190

申请日：1990-04-20

Applicant: UNIV LEHIGH

Inventor： KIM YONG W

IPC: G01J3/443 ,  G01J3/02 ,  G01J3/04 ,  G01J3/18 ,  G01J3/28 ,  G01N21/17 ,  G01N21/69 ,  G01N21/71 ,  G01N21/73

CPC classification number: G01J3/1809 ,  G01J3/02 ,  G01J3/0208 ,  G01J3/021 ,  G01J3/0286 ,  G01J3/0291 ,  G01J3/04 ,  G01J3/28 ,  G01J3/2889 ,  G01J2003/1828 ,  G01N21/718 ,  G01N2021/695

公开(公告)号：AU5532290A

公开(公告)日：1990-11-16

申请号：AU5532290

申请日：1990-04-20

Applicant: UNIV LEHIGH

Inventor： KIM YONG W

IPC: G01J3/443 ,  G01J3/02 ,  G01J3/04 ,  G01J3/18 ,  G01J3/28 ,  G01N21/17 ,  G01N21/69 ,  G01N21/71 ,  G01N21/73 ,  G01J3/36 ,  G01N21/63

Abstract: A method and apparatus for in-process transient spectroscopic analysis of a molten metal, wherein a probe containing a pulsed high-power laser producing a pulsed laser beam having a substantially triangular pulse waveshape is immersed in the molten metal and irradiates a representative quantity of the molten metal. The pulsed laser beam vaporizes a portion of the molten metal to produce a plasma plume having an elemental composition representative of the elemental composition of the molten metal. Before the plasma plume reaches thermal equilibrium shortly after termination of the laser pulse, a spectroscopic detector in the probe detects spectral line reversals, as caused by absorption of radiation emitted by the hotter inner portion of the plasma plume to relatively coller outer portions of the plasma plume, during a short first time window. Thereafter, when the afterglow plasma is in thermal equilibrium, a second spectroscopic detector also in the probe performs a second short time duration spectroscopic measurement. A rangefinder measures and controls the distance between the molten metal surface and the pulsed laser.

公开(公告)号：CA2051125A1

公开(公告)日：1990-10-22

申请号：CA2051125

申请日：1990-04-20

Applicant: UNIV LEHIGH

Inventor： KIM YONG W

IPC: G01J3/443 ,  G01J3/02 ,  G01J3/04 ,  G01J3/18 ,  G01J3/28 ,  G01N21/17 ,  G01N21/69 ,  G01N21/71 ,  G01N21/73 ,  G01J3/36 ,  G01N21/63

Abstract: A method and apparatus for in-process transient spectroscopic analysis of a molten metal, wherein a probe containing a pulsed high-power laser producing a pulsed laser beam having a substantially triangular pulse waveshape is immersed in the molten metal and irradiates a representative quantity of the molten metal. The pulsed laser beam vaporizes a portion of the molten metal to produce a plasma plume having an elemental composition representative of the elemental composition of the molten metal. Before the plasma plume reaches thermal equilibrium shortly after termination of the laser pulse, a spectroscopic detector in the probe detects spectral line reversals, as caused by absorption of radiation emitted by the hotter inner portion of the plasma plume to relatively coller outer portions of the plasma plume, during a short first time window. Thereafter, when the afterglow plasma is in thermal equilibrium, a second spectroscopic detector also in the probe performs a second short time duration spectroscopic measurement. A rangefinder measures and controls the distance between the molten metal surface and the pulsed laser.