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The purpose of this study is to perform a comparative analysis of the experimentally obtained and calculated values of the measuring windings total EMF amplitudes of the eddy current transducer with spatially periodic fields when magnetic and nonmagnetic cylindrical product are placed in it. To realize this goal in the work, a transducer with translational symmetry of excitation magnetic field has been developed. Translation symmetry typical example is the field of a long current conductor. The paper considers quasi-static electromagnetic field with the wavelength that exceeds characteristic transverse dimensions of conductor and cylinder. As the study result it is seen a satisfactory coincidence of the calculated and experimentally obtained values of the EMF of the transducer output signal in the cases of the product absence and with variety of products. As for example for measuring windings with angular coordinates φ = 30° and 60° an error of voltage values difference is less than 10%. The study shows that the advantage of such transducers while operating on one fixed frequency is capability to perform the multi-parameter testing on account of processing of certain amount of some spatial harmonics of excitation field.

Information about the parameters of the fuel supply is necessary to assess the operational and environmental performance and condition of the diesel engine of the car and tractor. To obtain such information, a special sensor is required, which is highly sensitive and is not built into the power system. The paper provides an analytical description of the processes in the overhead electromagnetic diesel fuel injection sensor. According to the selected electromagnetic circuit, an equivalent circuit is presented. Reasonable assumptions are made for the converter under consideration. Analytical dependences of electrical and magnetic parameters of a non-linear sensor circuit are presented. The conditions for obtaining the maximum sensitivity of the sensor are determined. An algorithm for calculating the magnetic circuit is presented. For the selected design parameters and operating current, the optimal frequency and supply voltage were determined.