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Process and a system for measuring and recording undulatory deformations of a rail surface

  • US 4,100,795 A
  • Filed: 03/10/1976
  • Issued: 07/18/1978
  • Est. Priority Date: 03/14/1975
  • Status: Expired due to Term
First Claim
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1. A process for measuring and recording undulatory deformations of a rail surface, comprising the steps of moving a feeling device along said rail surface, a vertical acceleration of said feeling device being produced upon moving along said rail surface and encountering undulations, generating a voltage signal by means of an accelerometer connected to the feeling device, said voltage signal being representative of the vertical acceleration of the feeling device moved along the rail surface, amplifying the voltage signal and filtering the thus amplified voltage signal through a filter, the filter having a central frequency and band width which vary as a function of the velocity of travel of the feeling device along the rail such that the response characteristics of the filter to wavelengths of the undulations of the rail falling with a range desired to be measured are substantially independent of the velocity, twice integrating the filtered signal, rectifying the twice integrated signal and amplitude-modulating the rectified signal through a circuit, the circuit having a response characteristic directly proportional to the velocity of travel of the feeling device along the rail, filtering the modulated signal to eliminate spurious signals having extremely high amplitude and frequency filtering signal, and recording the lastly filtered signal on a recorder.

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