UDS2-77 purpose

The UDS2-77 single rail flaw detector is capable of testing only one of the rails at a time for defects detection along the running surface and entire rail section excluding the rail foot flanges and also is intended for conformity testing of separate rail sections and welds using manual probes.

THE FLAW DETECTOR ADVANTAGES:

  • Rail complete sounding (excluding the foot flanges), due to the flaw detector multi-channeling.
  • Built-in standard setups for channels operation.
  • Defining the traveled distance and speed during the complete testing.
  • Real-time display of testing results in B-scan mode (by 4 channels).
  • Sounding and storing the information in every millimeter of traveled distance via all channels is provided in the flaw detector.
  • Recording the testing results at different sensitivity levels.
  • Registration of all testing results and advanced capabilities of data analysis.
  • Application of the flaw detector with the base sounding scheme allows to detect all types of fatal defects, appearing while rail track maintenance.

Fig. Displaying the testing results in A-Scan and B-Scan modes on the flaw detector screen

DISTINCTIVE FEATURES:

  • Large high brightness color TFT display.
  • Synchronization by encoder.
  • Result display: А-scan, B-scan.
  • Number of channels for complete testing: 13.
  • Number of channels for manual testing: 2.
  • Techniques and schemes for rail head sounding.
  • Application of base and additional schemes for rail sounding:
    • Pulse echo technique by angle-beam probes for testing of gauge and field face sides along and against the movement.
    • Pulse echo by angle-beam probes for testing of the rail head center along and against the movement.
    • Echo-mirror technique by angle-beam probes for testing of the rail head center along and against the movement.
    • Echo-mirror for testing of gauge and field face sides along and against the movement.

Fig. Pulse echo techniques for the rail head testing

Fig. Echo-mirror techniques for the rail head testing

  • Techniques and schemes for the web sounding and its projection into the foot:
    • Pulse echo and echo-images techniques for detection of longitudinal horizontal cracks with straight-beam dual element transducer.
    • Pulse echo technique for detection of transverse cracks and testing of weld joints with angle-beam transducer.

Fig. Pulse echo techniques for the rail web and foot testing

UDS2-77 MAIN SPECIFICATIONS

Overall dimensions of flaw detector without a handle and with one ultrasonic unit and power unit

no more than (1040×1640×1130);
in transport position – no more than (900×2060×600) mm

Equipped flaw detector weight

no more than 21 kg

Keypad

English, Russian

Languages

English, Russian

Number of multiplexer units (MUX)

4

Number of ultrasonic channels

14 channels

Connectors

BNC, RS-19

Data storage

Flash-card

Independent power source

NiMH storage battery with rated voltage 12 V and rated capacity 17 А∙h

Operation time

8 hours

Flaw detector consumed electric power

no more than 30 V·А

Time of flaw detector operation mode setup

no more than 15 sec.

Display type

800×480 pixels

Screen dimensions (width, height, diagonal)

155 mm, 95 mm, 180 mm (7,5 inch)

Warranty

1 year

INTERFACES

USB

USB-A (host), USB-B (slave)

Trigger O

available

Headphones

available

Encoder output

1 axis encoder line

MAIN METROLOGICAL PERFORMANCES

Temporal instability of sensitivity of flaw detector reception path

0.5 dB for 8 hours of continuous operation

Protection level in operation

IP 64

Ambient temperature

from minus 400 to plus 500 С

Atmospheric pressure

from 84 to 106.7 kPa

Relative humidity

(93 ± 3) % at a temperature of 25 ºС

Full average flaw detector lifetime

no less than 10 years

Non-failure operation

no less than 0.9 for 2 000 h

PULSER

Initial pulse type

short pulse of negative polarity

Initial pulse frequency

one channel mode – 250 Hz; complete mode – no more than 1000 Hz

Amplitude

180 V

Duration

60±10 ns

Rising edge duration

no more than 20 ns

Synchronization type

from the initial pulse, from the encoder

RECEIVER

Gain

from 0 to 100 dB with a step of 0.1, 1, 10 dB

Input signal

no more than 2 V from peak to peak

Input resistance of reception path

no more than 300 Ω

Digital filter

1 standard digital filter with a centre frequency of 2.5 MHz

Rectifier

envelope

SETUPS MODE

Measurements

mm

Testing range

from 0 to 1000 mm, with a step of 1, 10, 100 mm

Velocity

from 2000 m/s to 8000 m/s, with a step of 1, 10, 100, 1000 m/s

Probe zero

from 0 to 60 µs, with a step of 0.1, 1 µs.

Range delay

from 0 to 1000 µs, with a step of 1, 10, 100 µs

Refracted angle

from 0 tо 900, with a step of 100, 1000

ALARM system

Sound ALARM system

sound – separate for each rail and common (for a group of channels)
range of pulse frequency setup of sound indicator of alarm system is from 0.5 to 5 kHz, with setup resolution 100 Hz

Light ALARM

light – separate for each rail and common (via all sounding channels); visual by the screen – separate for each rail and each channel.

MEASUREMENT IN A-SCAN MODE

Displayed parameters

4 measured parameters are displayed in a status bar

  • А – echo amplitude from the defect relative to the ALARM level, dB
  • S – distance "by the beam" to the defect
  • X – defect depth coordinate, mm
  • Y – defect depth coordinate, mm

TCG curve

max. number of dots in a gate – 14, dynamic range – 100 dB, vertically adjustable step -1 dB, horizontally adjustable step – 2 dB.

MEASUREMENTS IN B-SCAN MODE

"Raw" B-Scan

  • А – max. echo amplitude from the defect relative to the screen center, dB
  • H – distance "by the beam" to defect, the echo signal from which has the max. amplitude, mm
  • dH – conditional length "by the beam", mm
  • L – coordinate along the scanning path to defect, the echo signal from which has the max. amplitude, mm
  • dL – conditional defect length, mm.




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