Patent ID: 9157803
Filing Date: 2015-10-13
Classification: G01J,G01N

Abstract:
1. A spark optical emission spectrometer comprising: a spark source comprising an electrode configured to produce a spark induced emission of light from a sample; a single entrance slit; a toroidal minor comprising a first radius of curvature in a horizontal plane and a second radius of curvature in a vertical plane and configured to direct the light through the single entrance slit, wherein the first radius of curvature and the second radius of curvature are different; a plurality of diffraction gratings configured to simultaneously diffract light directed through the entrance slit by the toroidal mirror; and a detector configured to detect the diffracted light from the plurality of diffraction gratings, wherein the toroidal minor directs the light through the entrance slit such that the light emitted from different regions in the spark source is spatially separated whereby a first diffraction grating is illuminated with light emitted from a first region of the spark source compared to a second diffraction grating illuminated with light emitted from a second region of the spark source.