Abstract-Metrology of transmission and reflection measurements by TDS

A. Steiger,   M. Kehrt, A. Deninger,

http://ieeexplore.ieee.org/document/8067221/


The aim of a common R&D project is the design and thorough characterization of a reference material for THz transmission and reflection measurements to leverage time-domain spectroscopy (TDS) for industrial applications.

Contact with Dr. Anselm Deninger head of Terahertz Technologies at TOPTICA and Abstract-Towards Quality Control in Pharmaceutical Packaging: Screening Folded Boxes for Package Inserts

My Note: I received the following email from Dr. Anselm Deninger, who is the Product Manager / Director of Terahertz Technologies at TOPTICA Photonics AG. I have linked the paper Dr. Deninger refers to below. Thank you Anselm, I appreciate hearing from the terahertz community, especially from a world leader in THz, such as yourself on behalf of TOPTICA!

Dear Randy,

A colleague has sent me the link to your blog. I must admit I had not been aware of it, but it is really a wonderful collection of links, clips and posts – great job!

Since the top headline of your blog explicitly mentions “process control”, I have taken the liberty of sending you a recent publication that we wrote in collaboration with scientists of Papiertechnische Stiftung, a German research institute focusing on the properties of paper. This is our first “terahertz application paper”, and if you find it interesting, feel free to include it in your pages. It is an open-access article, so there are no copyright restrictions to worry about.

If there is anything else related to terahertz in general, or the commercialization of the technology in particular, that I can help you with, then please do not hesitate to contact me.

Best regards from cloudy Munich,

Anselm

--
Dr. Anselm Deninger
Product Manager / Director THz Technologies

TOPTICA Photonics AG
Lochhamer Schlag 19
D-82166 Graefelfing/Munich

+49 89 85837-153 (ph)
+49 89 85837-200 (fax)

TOPTICA Photonics AG, Registered Office: 82166 Graefelfing, Germany
Companies' Register: Amtsgericht München, HRB 137368
Executive Directors: Dr. Wilhelm Kaenders, Dr. Thomas Weber
Chairman of the Supervisory Board: Dr. Dieter Schenk
www.toptica.com

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Towards Quality Control in Pharmaceutical Packaging: Screening Folded Boxes for Package Inserts

S. Brinkmann, N. Vieweg, G. Gärtner, P. Plew, A. Deninger, 

http://link.springer.com/article/10.1007/s10762-016-0345-y

We applied a recently developed, ultrafast terahertz measurement technique to screen folded cardboard boxes for package inserts. The presence or absence of an enclosed leaflet could be detected unambiguously in samples moving at velocities up to 21 m/s and, depending on the sample, up to an area overlap of 50–60%. The simple, robust measurement setup may pave the way to new applications of terahertz technology for quality control in pharmaceutical packaging.

Abstract-Terahertz waves and liquid crystals: prospects and challenges

N. Vieweg , A. Deninger
http://proceedings.spiedigitallibrary.org/proceeding.aspx?articleid=1661635

Over the last decades, scientists have paid growing attention towards the terahertz properties of liquid crystals. On the one hand, the dielectric properties of liquid crystals are relatively unexplored at terahertz frequencies, and the observed low-energy phenomena are not yet well understood. On the other hand, terahertz technology requires switchable devices, in which liquid crystals could potentially serve as a base material. This paper gives an overview of the research done so far on the properties and applications of liquid crystals in the terahertz frequency range. The path from first liquid-crystal terahertz experiments to comprehensive studies of their structure-property relation is outlined. Furthermore, the evolution from basic concepts to first liquid-crystal terahertz devices is sketched, and prospects as well as future challenges are discussed. Due to the development of compact and cost-efficient components, terahertz spectrometers matured from room-filling laboratory instruments to compact, reliable scientific tools. Modern terahertz systems are thus also covered in this report. Liquid-crystal devices could help terahertz technology continue this trend, and pave the way to a wider range of application.© (2013) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.

Abstract-Enhancing the stability of a continuous-wave terahertz system by photocurrent normalization

Roggenbuck, A ; Langenbach, M ; Thirunavukkuarasu, K ; Schmitz, H ; Deninger, A ; Mayorga, I Camara ; Güsten, R ; Hemberger, J ; Grüninger, M

http://cds.cern.ch/record/1516814?ln=en

In a continuous-wave terahertz system based on photomixing, the measured amplitude of the terahertz signal shows an uncertainty due to drifts of the responsivities of the photomixers and of the optical power illuminating the photomixers. We report on a simple method to substantially reduce this uncertainty. By normalizing the amplitude to the DC photocurrents in both the transmitter and receiver photomixers, we achieve a significant increase of the stability. If, e.g., the optical power of one laser is reduced by 10%, the normalized signal is expected to change by only 0.3%, i.e., less than the typical uncertainty due to short-term fluctuations. This stabilization can be particularly valuable for terahertz applications in non-ideal environmental conditions outside of a temperature-stabilized laboratory.