摘要:
The invention relates to a method for determining the carbon content of an iron alloy, comprising the following steps: a) starting the measurement (13) of a sample in a spark spectrometer, b) forming a plasma in a pre-spark phase, c) detecting (13) and recording an intensity signal of the carbon, d) calculating and masking (15) an unstable plasma phase, e) calculating an excess increase in the carbon signal (16, 17) and calculating the content of dissolved and undissolved carbon (18).
摘要:
The invention relates to a spectrometer for analysing the optical emission of a sample, comprising an excitation source, an inlet, a dispersive element which fans out the spectrum of the light generated in the excitation source in a plane, and solid body sensors comprising at least one line arranged in the region of the focal curve of the beam path in order to evaluate the spectral information. The sensors are arranged above or below the plane, and the spectral emission is deflected towards the sensors by mirrors and focussed, the reflecting surface of the mirror being aspherically formed in a direction of curvature.
摘要:
A Plasma Emission Transfer and Modification Device allowing for alteration of the plasma shape or characteristics for e.g. optimized viewing of relevant Plasma zones or improved coupling of a Plasma to the subsequent spectrometer optics, at the same time avoiding negative effects (e.g. heat transfer from the spectro-chemical source into subsequent system components) is described.
摘要:
The invention relates to a spectrometer for analysing the optical emission of a sample by the pulsed excitation of an optical spectral emission, said spectrometer comprising an excitation source, a gap arrangement, at least one dispersive element, and detectors for the emitted spectrum. According to the invention, two beam paths are provided with two dispersive elements, the first dispersive element imaging the spectrum of the emission onto a number of spatially resolving detectors, and the second dispersive element imaging the spectrum of the emission onto a number of time-resolving detectors.
摘要:
The invention relates to spectrometer optics comprising a beam path from a radiation source to a number of electro-optical sensors without local resolution, the beam path having an entry slot (7), a dispersive element (8) and a number of exit slots (9) that are positioned on a focal curve. In addition, said optics are provided with a first actuator for modifying the angle of incidence e (23) between the beam from the entry slot to the dispersive element and from the normal (13) to the dispersive element, a number of second actuators for displacing the exit slots tangentially to the focal curve (6) or in a peripheral direction along the focal curve (6) and a controller, which is designed to control the first actuator and the second actuators in order to carry out a calibration.
摘要:
The present invention relates to a method for correcting spectral interference in a spectrum which is determined using an inductively coupled plasma spectrometer (ICP) for analysing contents of the elements of a liquid or gaseous sample, said method having the following steps of: A. recording the spectrum of a matrix solution containing all spectrally interfering components, which are also contained in the sample, in a first concentration, B. recording the spectrum of the matrix solution with at least one dilution of the first concentration, C. regressing the signal intensities obtained in steps a. and b. against the concentration for a number of wavelength positions, D. calibrating the spectrometer, background correction using the values determined from the regression in step c and determining the calibration function c = f (I), E. recording the sample spectrum using at least one analyte which is contained therein, F. determining the concentration of the spectrally interfering components in the sample using the results obtained in step c. for wavelength positions at which there is no line of the analyte of the sample; and G. determining the sample signal which is characteristic of the analyte concentration by forming the difference between the spectrum from step e. and the calculated matrix spectrum with a dilution which was calculated in step f., wherein the calibration function c = f (I) is used.