Abstract-Industrial Applications of Terahertz Sensing: State of Play

Mira Naftaly ,Nico Vieweg,  Anselm Deninger

https://www.mdpi.com/1424-8220/19/19/4203

This paper is a survey of existing and upcoming industrial applications of terahertz technologies, comprising sections on polymers, paint and coatings, pharmaceuticals, electronics, petrochemicals, gas sensing, and paper and wood industries. Finally, an estimate of the market size and growth rates is given, as obtained from a comparison of market reports.

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Abstract-Fastest Thickness Measurements with a Terahertz Time-Domain System based on Electronically Controlled Optical Sampling

Milad Yahyapour, Angelika Jahn, Katja Dutzi, Thomas Puppe, Patrick Leisching, Bernhard Schmauss, Nico Vieweg,  Anselm Deninge

https://www.mdpi.com/2076-3417/9/7/1283

We apply a fast terahertz time-domain spectroscopy (TDS) system based on electronically controlled optical sampling (ECOPS) to contact-free thickness gauging. Our setup achieves a measurement speed of 1600 terahertz pulse traces per second, which—to our knowledge—represents the fastest thickness measurement performed with any terahertz system to-date. Using a silicon wafer as a test sample, we compare data of the ECOPS experiment to results obtained with a conventional terahertz TDS system and a mechanical micrometer gauge. We show that all systems provide consistent results within the measurement accuracy. Moreover, we perform thickness measurements of a rapidly moving sample and characterize the ECOPS setup with respect to time-domain dynamic range, signal-to-noise ratio, and spectral properties

Abstract-All fiber-coupled THz-TDS system with kHz measurement rate based on electronically controlled optical

http://www.opticsinfobase.org/ol/abstract.cfm?uri=ol-39-22-6482
Roman J. B. Dietz, Nico Vieweg, Thomas Puppe, Armin Zach, Björn Globisch, Thorsten Göbel, Patrick Leisching, and Martin Schell  »View Author Affiliations

We demonstrate a completely fiber-coupled terahertz (THz) time-domain spectrometer (TDS) system based on electronically controlled optical sampling with two erbium-doped femtosecond fiber lasers at a central wavelength of 1560 nm. The system employs optimized InGaAs/InAlAs photoconductive antennas for THz generation and detection. With this system, we achieve measurement rates of up to 8 kHz and up to 180 ps scan range. We further achieve 2 THz spectral bandwidth and a dynamic range of 76 dB at only 500 ms measurement time.

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