Details

Autor(en) / Beteiligte

• Behrens, Rolf
• Pullner, Björn
• Reginatto, Marcel

Titel

Measurements at laser materials processing machines: spectrum deconvolution including uncertainties and model selection

Ist Teil von

• Journal of sensors and sensor systems, 2021-02, Vol.10 (1), p.13-18

Ort / Verlag

Gottingen: Copernicus GmbH

Erscheinungsjahr

2021

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• Laser materials processing of workpieces using ultra-short pulsed lasers can lead to unwanted X-ray emission. Their dose rate and spectral distribution have been precisely determined. The measurements were carried out using a thermoluminescence detector (TLD)-based spectrometer in which 30 TLD planes are arranged one behind the other, the first 10 layers made of polymethyl methacrylate, while the remaining 20 layers are interspaced by absorbers with, from the front to the back, increasing atomic charge and thickness. The penetration depth of the radiation into the spectrometer depends on its energy, so that the energy-resolved spectrum of the radiation can be calculated from the TLD dose values by means of mathematical methods (Bayesian deconvolution). The evaluation process also takes into account both the uncertainties of all input quantities and the possibility of adopting different models for the spectrum form. This allowed the resulting spectra to be associated with their realistic uncertainty.