Patent ID: 7319519

Claim:
A spectrometer arrangement, comprising an echelle spectrometer and a light source emitting light and means for directing said light in the form of a light beam into said echelle spectrometer, the echelle spectrometer comprising: entrance slit means, echelle grating means for dispersing light incident thereon in a main dispersion direction, further dispersing means for further dispersing said light in a dispersion direction lateral to said main dispersion direction, an exit plane, further optical means for directing said light as a beam from said entrance slit means to said exit plane focussing said light beam in the form of a two dimensional spectrum in said exit plane, a planar detector means with a plurality of detector elements positioned in said exit plane, means for defining a reference position for said two dimensional spectrum on said detector, and manipulating means for manipulating position of said echelle grating means, further dispersing means and/or further optical means to cause a change of shape and/or position of said spectrum in said exit plane wherein said manipulating means are a combination of setting and controlling means for setting and controlling the position and the shape of said spectrum to said reference position and each wavelength of the spectrum allocated to a picture element is determined according to a constant relationship.