Laser induced breakdown spectroscopy (LIBS) apparatus with dual CCD spectrometer
First Claim
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1. A laser induced breakdown spectroscopy (LIBS) apparatus for measuring the LIBS spectrum of a subject, the LIBS apparatus comprising:
- a pulsed laser light source configured to produce a laser beam in the form of a train of laser pluses at a high repetition rate;
an optical focusing element configured to focus the laser beam onto a surface of the subject, wherein the train of laser pulses produce a plurality of plasma emissions from the subject; and
an optical spectrometer device operating in a continuous mode to measure an optical spectrum of the plurality of plasma emissions to obtain a LIBS spectrum;
wherein the optical spectrometer device is set to an integration time covering a plurality of periods of the laser pulse train;
wherein the optical spectrometer device comprises a diffract grating configured to diffract the plurality of plasma emissions in at least two diffraction orders and at least two detector arrays each configured to measure a spectral intensity of the diffracted plurality of plasma emissions in one of the at least two diffraction orders, respectively.
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Abstract
This invention discloses a compact laser induced breakdown spectroscopy (LIBS) apparatus suitable for field operations. The LIBS apparatus comprises a Q-switched laser with laser pulse energy between several tens and several thousands of micro joules (μJ), which is significantly lower than that of traditional LIBS lasers. The spectrograph of the LIBS apparatus employs a dual CCD (charge coupled device) design, which maintains compact size and in the meantime offers large spectral coverage and high spectral resolution.
16 Citations
12 Claims
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1. A laser induced breakdown spectroscopy (LIBS) apparatus for measuring the LIBS spectrum of a subject, the LIBS apparatus comprising:
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a pulsed laser light source configured to produce a laser beam in the form of a train of laser pluses at a high repetition rate; an optical focusing element configured to focus the laser beam onto a surface of the subject, wherein the train of laser pulses produce a plurality of plasma emissions from the subject; and an optical spectrometer device operating in a continuous mode to measure an optical spectrum of the plurality of plasma emissions to obtain a LIBS spectrum; wherein the optical spectrometer device is set to an integration time covering a plurality of periods of the laser pulse train; wherein the optical spectrometer device comprises a diffract grating configured to diffract the plurality of plasma emissions in at least two diffraction orders and at least two detector arrays each configured to measure a spectral intensity of the diffracted plurality of plasma emissions in one of the at least two diffraction orders, respectively. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Current AssigneeMetrohm Spectro Incorporated
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Original AssigneeBWT Property, Inc.
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InventorsZhou, Xin Jack, Wang, Sean Xiaolu, Li, Qun
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Primary Examiner(s)Ayub, Hina F
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Application NumberUS14/708,638Publication NumberTime in Patent Office862 DaysField of Search356318US Class CurrentCPC Class CodesG01J 3/0208 using focussing or collimat...G01J 3/021 using plane or convex mirro...G01J 3/0291 Housings; Spectrometer acce...G01J 3/18 using diffraction elements,...G01J 3/443 Emission spectrometryG01N 21/718 Laser microanalysis, i.e. w...
