Abstract
Position determination is an important manufacturing process in many modern industries. The objective of this paper is to present an affordable measurement system that can replace optical position measurement with a laser beam in an opaque environment that prevents the laser beam from penetrating through the fog of gases or other materials that are opaque to optical light. THz waves are a good example of replacing a laser beam, as shown in this article. It is known that THz rays can penetrate fabrics, wood, Styrofoam, etc. The triangulation method using an amplitude modulated THz source proved to be a cost-effective solution for position determination in opaque environments.
Highlights
The THz band, which is defined in the frequency range from about 100 GHz to 10 THz [1], is one of the least explored ranges of the electromagnetic (EM) spectrum, due to technological difficulties in fabricating compact and inexpensive THz sources [2]
Due to the aforementioned reasons, this paper proposes an amplitude modulated (AM) THz system, using the triangulation principle for distance measuring
When the resolution of the proposed method is compared with the resolution of a commercially available frequency modulated continuous wave (FMCW) method, comparable results are obtained
Summary
The THz band, which is defined in the frequency range from about 100 GHz to 10 THz [1], is one of the least explored ranges of the electromagnetic (EM) spectrum, due to technological difficulties in fabricating compact and inexpensive THz sources [2]. From 1980 onwards, research in the THz range began to expand, mainly due to major advances in optics (higher frequency range) and microwave technology (lower frequency range), which reduced costs and improved access to the required elements [2]. There are two main methods used in THz systems which differ according to the source of the THz wave. The first is an optical method in which the laser beam (frequencies in the THz range (1015 Hz), mainly pulsed, with low power) is converted to the THz range [3]. The second method is the so-called electronic method, where microwaves (frequencies in the GHz range, mainly continuous waves and higher powers) are converted up to the THz range [2]. Electronic oscillators (in the MHz range) are usually used as a base and multiply the microwave input with diodes, exploiting their nonlinear property
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