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This paper investigated a $K$ -band sweep frequency microwave imaging for the evaluation of coated atmospheric corrosion on mild steel. After theory analysis, the experimental system has been built by using a $K$ -band open-ended rectangular waveguide, a vector network analyser, a scanning system, and a signal processing algorithm. Exposed and coated steel samples with different exposure periods...
A broadband YIG tuned oscillator (YTO) frequency sweeping signal generator based on the DDS-PLL method is introduced. A linear sweep frequency sinusoidal signal generated by DDS is used to a reference signal of the YTO PLL (Phase-Locked Loop), and the other input of PLL is the linear frequency sweep signal of the YTO, the resulting error correction signal drives the YTO FM coil. Error correction signal...
Using the existing pits, wells and tunnels in mine areas, high power electromagnetic transmitters on the ground and underground (pit, well) and receivers on the ground can be integrated as a quasi 3-D measuring device, which provides a new method for exploration of metal mines. Under-research transmitters as actuating devices can automatically transmit high power inverted square wave in sweep frequency...
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