Ultrasonic inspection is one of the methods of acoustic non–destructive testing (NDT). NDT systems base on multi-element ultrasonic sensors, the so-called ultrasonic phased arrays, have become widespread. Such systems allow you to perform ultrasound inspection with a higher speed compared to devices based on single-element sensors, but require a high-performance data collection subsystem. The proposed subsystem provides capture and parallel processing of all signals multi-element sensors in real time.

The subsystem consists of independent channels and is built on a modular principle.

• 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.

Reciever

• Number of receivers: 128 (16 MUX 8);

• Input impedance: 50 ohms, other values are implemented if necessary;

• Threshold value of input voltage: 100 mkv;

• Max. Input voltage value: 10 BSS;

• 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;
  - the minimum distance between the reference points is 1 microsecond, the dynamic range of the RF is reduced by the value of the base gain;
  - the steepness of the HRF is 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;

• Setting the signal delay in the channel. Precise setting: from 3.2 ns to 14.8 ns in 10 pcs increments.. Rough installation: from 12.5 ns to 819 microseconds with a step of 12.5 ns ;

Any of the elements of ultrasonic sensors can be 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 permission: 12.5, 25, 50, 100 ns depending on the digitization frequency;

• TCP/IP interface for the exchange of control information between system blocks.