Austin AI, Inc.
Austin - High End Laser Technology
FromAustin AI, Inc.
LIBS Modern sensor-based sorting technologies offer much-enhanced sorting functionality, sorting wrought Al alloy scrap into different grades including 5xxx and 6xxx series alloys and removing unwanted product.
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- Laser-induced breakdown spectroscopy (LIBS) is a type of atomic emission spectroscopy which uses a highly energetic laser pulse as the excitation source.
- The laser is focused to form a plasma, which atomizes and excites samples.
- In principle, LIBS can analyze any matter regardless of its physical state, be it solid, liquid or gas.
- Because all elements emit light of characteristic frequencies when excited to sufficiently high temperatures, LIBS can (in principle) detect all elements.
- If the constituents of a material to be analyzed are known, LIBS may be used to evaluate the relative abundance of each constituent element, or to monitor the presence of impurities.
- LIBS operates by focusing the laser onto a small area at the surface of the specimen; when the laser is discharged it ablates a very small amount of material, in the range of nanograms to picograms, which generates a plasma plume with temperatures in excess of 100,000 K.
- During data collection, typically after local thermodynamic equilibrium is established, plasma temperatures range from 5,000–20,000 K.
- At the high temperatures during the early plasma, the ablated material dissociates (breaks down) into excited ionic and atomic species.
- During this time, the plasma emits a continuum of radiation which does not contain any useful information about species presented, but within a very small timeframe the plasma expands at supersonic velocities and cools.
- At this point the characteristic atomic emission lines of the elements can be observed.
- The delay between the emission of continuum radiation and characteristic radiation is in the order of 10 μs, this is why it is necessary to temporally gate the detector.