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Cooperative project: Handheld-Terahertz-Spectrometer of explosive Liquids (HANDHELD) im Rahmen der Ausschreibung "Detektionssysteme für chemische, biologische, radiologische, nukleare und explosive Gefahrstoffe (CBRNE Gefahren)"   The prevented bomb attacks to airplanes have revealed security gaps in the existing security control of flight passengers and their luggage. Until now it is very easy to smuggle explosive dangerous goods appearing as harmless liquids in conventional shampoo or beverage bottles through the control. Though sufficient to damage airplanes, the existing security controls cannot detect these liquids remotely. In addition to that, x-ray radiation is not suitable for checking persons as it is only allowed for medical purposes. For closing this security gap, new and mobile detection methods are necessary, which have to be non-destructive, contact-free and not dangerous for people, but sensitive to traces of different dangerous goods. Usually, modern detectors are portable, hand-held, compact measuring devices, which may be produced at low cost compared to the existing detector systems. A promising candidate for the detection of dangerous substances is terahertz spectroscopy. It uses the interaction of electromagnetic field in the terahertz frequency range with matter and returns a spectroscopic fingerprint. Special advantages of the THz radiation are its innocuousness for man and the transparency of clothes and packaging materials. It should be possible to detect and analyze explosive substances even in closed bottles. The THz measuring technique is just at the beginning of development. For this is the reason, until now THz spectrometers are expensive, big and sensitive laboratory equipment, which are fixed to one place and need sensitive adjustment. Objects are mostly examined in transmission. So this is not a practical method for use in the security area. The objective of this project is to develop a demonstrator of the word wide first hand-held THz spectrometer. Another aim is to expand a material data base with reference spectra of explosive liquids. The company TEM Messtechnik GmbH contributes with the development of special fiber stretchers, including control- and modulation electronics. The completely fiber-coupled spectrometer makes the conventional free-beam delay lines unnecessary, thus reducing adjustment effort. Support code: 13N9517 Period of the project: 01.01.2008-31.12.1012 Keywords: explosive liquids, explosive substance detection, spectroscopic detection, terahertz´-spectroscopy, femto-second laser, fast photoconductor, photoconductive antennae