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The Role of Frequency in Radar Level Measurement

By Jonathan Pradel |

No single frequency is suitable for all applications in the CPI. Understanding the principles behind the technology will help in selecting the right device Radar has proven to be a reliable technology for level measurement in silos and tanks. However, there have been discussions recently about the capabilities of high radar frequencies: 80 GHz is often called a universal talent for all applications. But does this apply without restriction? Will all previously used frequencies be replaced? To answer these questions and to understand the possibilities in general, some background knowledge about radar technology is required. FIGURE 1. The measurement principle of FMCW radar technologyis shown here[/caption] Radar technology There are two types of radar used for level measurement: pulse radar and frequency-modulated continuous-wave (FMCW) radar. Today, FMCW is the favored technology that all major industrial process instrumentation manufacturers rely on. In FMCW devices, radio waves whose frequency is modulated over a bandwidth are continuously emitted, and the reflections are collected by a receiver. The difference between a transmitted and received wave of a given frequency is measured, and that is proportional to the distance to…
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