National Research Council of Canada

Other

Rene Heon

Jean-Pierre Monchalin

Mohamad Sabsabi

John M Lucas

Christian Padioleau

Paul Bouchard

Peter John Hardman

Described are various embodiments of a system, method and device for laser induced breakdown spectroscopy (LIBS). In some embodiments, the LIBS system comprises a silicon photomultiplier (Si PM) operated in a time-gated photon counting mode. Some such embodiments allow for the provision of a portable LIBS device. Also provided are embodiments for the measurement of constituent carbon, gold and/or other precious metal group elements in a target sample.

Laser-induced breakdown spectroscopy system and method, and detection system and method therefor

A method and apparatus for spectrochemical analysis of liquids, including molten materials, using laser-induced plasma spectroscopy. The apparatus preferably comprises a high power pulsed laser focused on the surface of a liquid stream flowing in a measurement cell, and an optical spectrometer-detector assembly, which receives, detects and analyzes the radiation emitted by the high temperature plasma thereby excited. The measurement cell, and optional pump, establish a steady flow of liquid, thereby permitting the laser to repeatedly sample a fresh unperturbed surface, representative of the liquid volume, while also ensuring that bubbles and waves formed in the liquid are removed from the focal volume. Gas (usually air) blown above the liquid prevents aerosols and matter ejected from the sample responsive to the incident energy from interacting with subsequent laser pulses, and from accumulating on the optics.

Method and apparatus for in-process liquid analysis by laser induced plasma spectroscopy

An optical detection of a surface motion of an object is disclosed. An optical interferometer receives a laser light which is scattered from the surface of the object and transmitted through a substantial length of an optical fiber. The stabilization is carried out by a signal which is obtained by processing signals generated by a reference detector and a stabilization detector located respectively at the input side and the output side of the interferometer.

Optical detection of a surface motion of an object using a stabilized

A laser ultrasound detection technique which is insensitive to laser intensity fluctuations, perturbation at the object surface and the like is disclosed. The invention consists of two substantially identical interferometers of the Fabry-Perot type or such an interferometer with a birefringent element in its optical cavity. The interferometers have resonance frequencies higher and lower than the laser frequency so that noises can be cancelled out by signal processing.

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Longueuil, Canada

Rene Heon