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The aim of this study was to apply terahertz (THz) technology to security applications, and in particular, for screening and identification of drugs-of-abuse in mail. Comparison was made of transmission spectra obtained with both THz time-domain spectroscopy and a tunable THz source, and the effects of sample configuration on the resulting spectra were examined. The utility of diffuse reflectance...
We had proposed and developed a THz-wave apparatus for the nondestructive detection of illicit drugs and hazardous substances hidden in sealed envelopes. In actual inspection, we have proposed the following procedure: First, X- ray pre-inspection is carried out; second, the measurement of scattered THz waves is applied to pick up suspicious mails; and, third, the identification of the drugs is done...
A series of experiments in the field of THz-wave spectroscopy is described. The measurement of absorption spectra of solid samples, powders, and liquids is demonstrated using various optical setups. One of the sources we used is a widely tunable coherent THz-wave generator relying on an optical parametric process: nanosecond Q-switched Nd : YAG laser light scattering from the polariton mode of a MgO-doped...
The absence of practical technology to detect illicit drugs or hazardous substances hidden in sealed envelopes by nondestructive methods has made it extremely difficult to prevent them from being smuggled domestically and across international borders. We are developing a prototype apparatus that can identify these substances concealed inside sealed mail without opening it, by taking advantage of the...
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