Abstract-THz ATR Spectroscopy for Inline Monitoring of Highly Absorbing Liquids

Amin Soltani,  Stefan F. Busch, Patrick Plew, Jan C. Balzer, Martin Koch,
http://link.springer.com/article/10.1007%2Fs10762-016-0285-6

We present a THz attenuated total reflection (ATR) setup which allows for inline measurements of highly absorbing liquids. As a proof of principle, we investigate a mixture of water and ground calcium carbonate (GCC) from 5 to 40 wt%. Inline measurements prove that our THz ATR setup allows for the distinction of various concentrations. As an example, we show inline THz ATR measurements for 30 to 40 wt% for GCC watery solution, as this concentration range is of technical relevance. We obtain a sensitivity better than 2 wt%.