Multichannel ultrasonic data asquisition subsystem for NDT

Ultrasonic inspection is a method of acoustic non-destructive testing (NDT). NDT systems utilizing multi-element ultrasonic sensors, known as ultrasonic phased arrays, have become widely adopted. These systems enable ultrasound inspections at higher speeds compared to single-element sensor devices but require a high-performance data collection subsystem. The proposed subsystem captures and processes all signals from multi-element sensors in real time.

The subsystem is composed of independent channels and is designed using a modular architecture.

Features

Emitter

  • Number of transmitters: up to 128.
  • Probing pulse voltage: -50 to -180 Volts per 50 ohm load.
  • Probing pulse shape: rectangular, negative.
  • Probe pulse width: from 12.5 ns to 800 ns, adjustable in 2 ns increments.
  • Front duration: 9 ns ± 3 ns (amplitude increase from 10% to 90%).
  • Drop duration: 20 ns ± 5 ns (amplitude decay from 90% to 10%).
  • Output impedance: 50 ohms.
  • Pulse repetition rate: up to 15 kHz, depending on the pulse width, probing voltage, sampling frequency, and monitoring range.
  • Probing pulse delay: from 0 ns to 12.8 microseconds in 0.25 ns increments.

Receiver

  • Number of receivers: 128 (16 MUX 8).
  • Input impedance: 50 ohms, other values are implemented if necessary.
  • Threshold value of input voltage: 100 µV.
  • Max. input voltage value: 10 VSS.
  • Dynamic range of the amplifying path: 0–100 dB, in 0.1 dB increments.
  • Type of amplifying path: linear.
  • HRF (Temporary sensitivity adjustment):
      • Dynamic range: 0–80 dB with a 0.1 dB installation step, 256 reference points.
      • Minimum distance between the reference points: 1 microsecond. The dynamic range of the RF is reduced by the value of the base gain.
      • Steepness of the HRF: up to 40 dB/ms.
  • Frequency range of the amplifying path: from 500 kHz to 20 MHz (level -3 dB).
  • Analog filters: 2 bandpass filters at selected frequencies.
  • Operating modes: Echo-pulse, separate-combined.
  • Signal delay in the channel: precise setting from 3.2 ns to 14.8 ns in 10 ps increments; rough installation from 12.5 ns to 819 microseconds with a step of 12.5 ns.

Any ultrasonic sensor element can function as both an emitter and a receiver.

Digital Block

  • ADC: 16 bit (15 bit + sign bit), 200 MHz.
  • ADC dynamic range: >72 dB at 80 MHz digitization frequency.
  • Sampling frequency: 80, 40, 20, 10 MHz, adjustable for the measurement cycle.
  • Temporary resolution: 12.5, 25, 50, 100 ns depending on the digitization frequency.
  • TCP/IP interface for the exchange of control information between system blocks.
For further technical information:

info@minerva-tech.com

For purchasing or licensing:

sales@minerva-tech.com


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