Terahertz radar
Terahertz radar are radar devices with a carrier frequency between 0.1 THz and 10 THz.
These devices are mostly based on a small integrated component that contains the entire high-frequency processing with all the necessary antennas and that is no larger than a thumbnail. These devices mostly work on the basis of a frequency-modulated continuous wave process . Further processing of the maximum frequency by using these modules is not necessary, as the echo signals are mixed down internally into the baseband . The bandwidth of this baseband depending on the application of only a few megahertz to gigahertz range to single digits. For a resolution of, for example, 3.75 cm, a bandwidth of 4 GHz is theoretically required.
These terahertz modules are used, for example, in so-called body scanners , in the assembly line quality control of already packaged objects (fluoroscopy) and in the evaluation of the thickness of protective coatings or laminates as well as the detection of foreign bodies in food. Body scanners use the fact that these terahertz frequencies can easily penetrate dry and non-conductive substances, but the moisture in the skin cannot penetrate deeper than just a few millimeters.
Individual evidence
- ↑ Terahertz imaging , application
- ↑ a b Terahertz Synthetic Aperture Radar for the detection of defects in plastic products
- ↑ S. Scherr et al., Miniaturized 122 GHz ISM band FMCW radar with micrometer accuracy, Radar Conference (EuRAD), 2015 European, Paris, 2015, pp. 277-280.
- ↑ Data sheet TRX 120G of a terahertz radar chip
- ↑ Science X network at Phys.org
- ↑ Fraunhofer Institute for High Frequency Physics and Radar Technology, High Frequency Systems - New Ways in Quality Control, ( PDF , accessed on July 3, 2017)
- ↑ A. Hoffknecht, D. Holtmannspötter, A Purpose: Terahertz technology and its possible applications , Düsseldorf, 2006, ISSN 1436-5928, p. 44 ( PDF )