Imaging using terahertz time-domain spectroscopy in motion

Simon Christmann; Imke Busboom; Dennis Fertsch; Carsten Gallus; Hartmut Haehnel; Volker K. S. Feige

doi:10.1117/12.2577744

5 March 2021 Imaging using terahertz time-domain spectroscopy in motion

Simon Christmann, Imke Busboom, Dennis Fertsch, Carsten Gallus, Hartmut Haehnel, Volker K. S. Feige

Proceedings Volume 11685, Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications XIV; 1168506 (2021) https://doi.org/10.1117/12.2577744
Event: SPIE OPTO, 2021, Online Only

Abstract

Terahertz time-domain spectroscopy has the potential to revolutionize quality inspection by allowing contactfree and non-destructive measurements. However, since most currently available spectrometers only measure one location point per measurement, a raster scan procedure is necessary to obtain an image. Depending on the size of the object and the desired density of measurement points, even fully automated raster scans are timeconsuming. Often, a defect on the surface can be seen with the bare eye. In such a case, the goal of a terahertz analysis is to identify the type of defect below the surface. To fill this gap, we have developed a demonstrator with a collaborative robot (cobot) that allows interactive measurements to be performed where the measurement system can be guided by hand. In this case, however, it is no longer possible to stop to perform a measurement, so measurements must be taken during the movement. This places special demands on the simultaneous acquisition of measurement data and the robot position from the two subsystems: robot and terahertz spectrometer. In this paper, we describe a way to synchronize and combine the data from the two subsystems to form a 2D image. These imaging results are displayed in real time in a web-based user interface.

Conference Presentation

Citation Download Citation

Simon Christmann, Imke Busboom, Dennis Fertsch, Carsten Gallus, Hartmut Haehnel, and Volker K. S. Feige "Imaging using terahertz time-domain spectroscopy in motion", Proc. SPIE 11685, Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications XIV, 1168506 (5 March 2021); https://doi.org/10.1117/12.2577744

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