Instruments and Systems: Monitoring, Control, and Diagnostics Annotation << Back Double-Spiral Track Counter for Railway Transport I.F. YANGIROV, A.R. KHALIKOV, R.A. SAFIULIN The design of a track spiral counter with the possibility of generating an electric beat during the passage of railway transport with greater accuracy of fixation due to an increase in the amplitude of the signal beat is proposed. To increase the stability of the counter, it is necessary to have a resonant circuit at the output, which, together with L2 and C2, would form a bandpass filter with the required bandwidth, using the influence of external factors (for example, the capacitances supplied to the counter of the cable for powering the alternating excitation winding). The double-spiral counter can be used as a metal detector in the military industry. Keywords: heartbeat, resonance, frequency, sensitivity. DOI: 10.25791/pribor.10.2021.1298 Pp. 32-38.