Sensitive Element on Cross-Wound Helices

A novel sensitive element, formed by cross-wound helices, is investigated and described in this paper. Based on the outstanding properties of the coupled slow-wave structures, such as splitting electric and magnetic fields and the multiple increase in the slowdown, this sensitive element combines the advantages of the elements with distributed parameters and the relatively low operating frequencies. Concentrating the electromagnetic field in a measurement volume, caused by the slowing of the wave, and splitting electric and magnetic fields lead to a significant increase in sensitivity. The main properties and some characteristics of the cross-wound helices are analyzed, calculated, and measured. The practical realization of the described sensitive element is demonstrated on the example of a linear displacement sensor, patented, and placed on the market.