Biparametric resonant transformer sensor of large linear movements

It is shown that the implementation of the working air gaps between the extreme and average long rods of the magnetic circuit decreasing along the coordinate of the moving element from the source of the magnetizing force according to a certain law provides a linear increase in the inductance of one winding and a linear decrease in the inductance of the other winding of two identical series-connected inductance coils, as a result of which the total inductance of the two windings remains unchanged and, therefore, the resonance of currents in the primary circuit and the resonance of voltages in the secondary circuit of the sensor is maintained and increased sensitivity is provided over the entire operating range of movement of the moving element-ring. It was found that the connection in series with the capacitor of the active resistance in the primary circuit and the fulfillment of the condition RC1=RL1=L1/C1=[L11(x)+L12(x)]/C1 allows you to maintain the resonance of the currents in the excitation circuit at any frequency of the voltage of the sensor power supply, which, firstly, allows the use of a power supply of any frequency, and secondly, when the frequency of the power supply deviates in the primary circuit of the sensor, the resonance mode is maintained, as a result of which the region expands sensor applications.