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

IF 0.8 Q4 INSTRUMENTS & INSTRUMENTATION Journal of Sensors and Sensor Systems Pub Date : 2021-02-18 DOI:10.5194/JSSS-10-13-2021
R. Behrens, B. Pullner, M. Reginatto
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引用次数: 2

Abstract

Abstract. 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. The measurements are traceable to the Systeme international d'unites (SI), i.e. the International System of Units. The results not only provide manufacturers and users of ultra-short pulsed lasers with important information on the design of the machines with regard to radiation protection, but were also included in the recently concluded legislative procedure in the field of radiation protection in Germany.
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激光材料加工机的测量:光谱反褶积,包括不确定度和模型选择
摘要使用超短脉冲激光器加工工件的激光材料会导致不必要的x射线发射。它们的剂量率和光谱分布已被精确地测定。使用基于热释光探测器(TLD)的光谱仪进行测量,其中30个TLD平面一个接一个地排列,前10层由聚甲基丙烯酸甲酯制成,其余20层由吸收剂间隔,从前到后增加原子电荷和厚度。辐射进入光谱仪的穿透深度取决于它的能量,因此辐射的能量分辨光谱可以通过数学方法(贝叶斯反卷积)从TLD剂量值计算出来。评估过程还考虑了所有输入量的不确定性和对频谱形式采用不同模型的可能性。这使得得到的光谱与实际的不确定性相联系。这些测量可以追溯到国际单位制(SI),即国际单位制。研究结果不仅为超短脉冲激光器的制造商和用户提供了有关辐射防护机器设计的重要信息,而且还被纳入德国最近完成的辐射防护领域立法程序。
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来源期刊
Journal of Sensors and Sensor Systems
Journal of Sensors and Sensor Systems INSTRUMENTS & INSTRUMENTATION-
CiteScore
2.30
自引率
10.00%
发文量
26
审稿时长
23 weeks
期刊介绍: Journal of Sensors and Sensor Systems (JSSS) is an international open-access journal dedicated to science, application, and advancement of sensors and sensors as part of measurement systems. The emphasis is on sensor principles and phenomena, measuring systems, sensor technologies, and applications. The goal of JSSS is to provide a platform for scientists and professionals in academia – as well as for developers, engineers, and users – to discuss new developments and advancements in sensors and sensor systems.
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