Ultrasonic flaw detector UDS2-RDM-12 is designed for detection, registration and decoding of signals from defects in rails of railroad tracks in sections, the inspection of which simultaneously on two strands is difficult or unsafe (rails located in tunnels, on bridges, near passenger platforms, in places with heavy train traffic, etc.).etc.);
– in rails of kilometer stock;
– in old-year rails at rail-welding enterprises;
– during random manual inspection of welded joints, separate sections and sections of rails with determination of coordinates of locations, detectability coefficient, and conditional length of detected defects.

The flaw detector is produced according to technical specifications SF-40341933-044:2010

Rails of P43, P50, P65, P75, UIC 60, S 49, as well as rails of connecting tracks, cross rails, cross whiskers, shackles and frame rails of switches are subject to control.
Codes of detectable defects according to the classifier of rail defects NTD/CP-1-93 with an addendum on classification of defects and damages of elements of switches from 27.01.1996:

20.1-2, 21.1-2, 24.1-2, 25.1-2, 26.3, 27.1-2, 30C.1-2, 30G.1-2, 38.1, 50.1-2, 52.1-2, 53.1-2, 55.1-2, 56.3, 60.1-2, 66.3, 69.2, 70.1-2, 74.1-2, 79.1-2, DO.20.2, DSN.20.2, DO.60.2, DSN.60.2, DR.21.2, DU.22.2, DUN.21.2.

• The number of independent information channels realized at work with blocks of piezoelectric resonators (SR) in the mode of continuous control is 14, 8 of them with realization in the channel of separate, 6 – combined scheme of emission and reception of ultrasonic sounding.
• The number of excitation and reception channels of the ultrasonic excitation and reception provided for operation with manual piezoelectric transducers (PEP) is 3 (including 1 for operation with manual low-frequency PEP).
• Sound and color (on the screen of the matrix display) signaling of defects.
• Color indication of set values of conditional sensitivity of channel control (dB), defect detectability coefficient, defect coordinates, current track coordinate of control, track section.

The flaw detector provides:

• continuous registration of the inspection results in the form of defectograms of the inspected sections, registered after 1 mm of the track, with accompanying information about amplitude and time characteristics of the registered echo-signals, set in each of the control channels of the settings parameters, current values of the track coordinate and speed of the flaw detector movement.
• possibility of operative viewing of the registered defectograms on a non-inertial color matrix indicator of the flaw detector, and output of defectograms with accompanying information to a PC for their further decoding.

  Distinctive features of UDS2-RDM-12:

  1. use in the mode of continuous inspection of the improved scheme of sounding with the use of 14-channel serial-parallel system of excitation and reception of ultrasonic oscillations, providing detection of differently oriented defects in one pass of the controlled area;
  2. use of a module of 8 differently oriented ultrasonic resonators with an input angle of 65° in the main rail head inspection scheme for emission and reception of ultrasonic vibrations (USR), allowing to increase the reliability of inspection of “noisy” rails and rails, wear of which is close to the maximum permissible, as well as rails, the dimensions and (or) profile of the head of which deviate from the standard values for rails of types R43, R50, R65, R75 (straight frame rails, curved frame rails, straight rails, curved rails);
  3. completion of the flaw detector with a specialized coordinate device for carrying out a refining inspection by a manual piezoelectric transducer with the possibility of obtaining the inspection protocol in the form of a projection of the defectogram of the inspected rail section on the PEP scanning plane and viewing the protocol on the screen of the flaw detector and on a personal PC;
  4. use of GLONASS, GPS global positioning system in the flaw detector to determine the coordinates of the flaw detector location on the way;
  5. application of a color matrix indicator in the electronic unit of the flaw detector, which provides increased informativeness at operative viewing of defectograms on the screen of the flaw detector;
  6. possibility to display on the flaw detector screen together with the channel mnemonic scheme either the A-type scan of the activated channel or the CD scan of the same channel in real time (scan in coordinates: ultrasonic sound propagation time – traveled path with color gradation of the echo-signal amplitude;
  7. possibility to enter into the flaw detector memory a list of coordinates of rail sections, which, according to the results of defectograms decoding on the PC, need to be rechecked due to the loss of acoustic contact in the inspection channel, the presence of surface defects or suspicious marks on defectograms decoded on the PC at the registration level of minus 6 dB.
  8. availability of a programmable database for the included transducer units (TU) and PEPs (by type and number) with parameters of resonators and PEPs used in each of the control channels. Transducer units are equipped with an electronic unit identifier on the basis of non-volatile memory, which allows storing and automatically reading the parameters of resonators of the unit during operational change of the unit on the way;
  9. a system of automatic restoration to the level of the recommended conditional control sensitivity in the channel where the sensitivity was previously reduced by the operator (e.g., when going to the “noisy” rails and then returning to the “non-noisy” rails);
  10. the system of voice notification of acoustic contact loss in the channel, if the length of the loss section exceeds the value programmed in the menu.
  11. transfer of information from the flaw detector electronic unit to PC using removable USB Flash drive media, as well as via USB-device interface (cable connection between the electronic unit and PC);
  12. Software for ultrasonic flaw detectors UDS2-RDM-12, UDS2-RDM-22, UDS2-RDM-23: “Program of visualization and signal processing” allows the transcriber to get the most complete picture of the inspected track section and give a detailed conclusion on it. The software automatically detects and recognizes the protocols of the corresponding flaw detector.

      Range of calibrated echo gain adjustment, dB.	0 to 70
      The discreteness of the gain control is dB.	1
      Basic absolute error of reflector coordinates measurement, mm.	not more than ± (0.02 H(L) + 1)
      Operating frequency of continuous control channels, MHz.	2,5 ± 0,25
      Current consumption, A.	no more than 0.8
      Operating temperature range, °С.	-40 to +50
      Overall dimensions of the flaw detector: without removable handle and rod in working condition, mm. in folded form, mm.	950x350x 1100 950x350x 500
      Weight of the loaded flaw detector, kg. (without contact fluid)	no more than 21
      Contact fluid tank volume, l.	5
      Continuous operation time of the flaw detector from a freshly charged battery, h.	at least 16

• Electronic unit of flaw detector UDS2-RDM-12 is made in dust and water-proof version with protection degree IP54.
• The flaw detector is resistant to ambient relative humidity up to 98% at 35°C and lower temperatures without condensation.