Digital ultrasonic flaw detector in the application of UT flaw detector

1 Introduction

UT inspection technology as industry 5 large conventional NDT technologies, has been widely used.

In the medium-and long-term use of UT is A type of pulse-echo-ultrasonic flaw detector, its circuit block diagram shown in Figure 1.

This kind of instrument display shows the electric pulse signals, inspection personnel from these signal distinguish defects and other various types of waves, its considerable difficulty, misjudgement, leakage phenomenon often occurs, contracted severely hampered UT technology in deeper.

But with the development of electronic technology, its achievements in UT industry are widely applied, a digital ultrasonic flaw detector came into being, he makes the UT has had a revolutionary technology change, not only on the ultrasonic signal for real-time recording, even given the nature of the defect wave.

2 digital ultrasonic flaw detector works

And A different type of pulse detector, digital detector circuit with major changes in its circuit block diagram shown in Figure 2.

Digital signal processing is used to program in your computer.

Typically, the first thing to do is to remove noise in the signal, followed by the removal of noise signals already carried out UT inspection required treatment, including a gain control, signal attenuation compensation, routes etc.. package Ultrasound signal, after receiving a portion of the amplifying from analog to digital converters into digital signals to the computer, the location of the transducer may be controlled by computer or by manual operation, the converter will swap the position number to the computer. The computer then changes with time and location of ultrasonic wave-shaped for proper disposal, concluded that further to the conclusions of the control system, thus setting the parameters or results of the processing, graphics and other waveform display on the screen, print it out or to light, sound recognition and alarm signals.

3 digital ultrasonic flaw detector advantages

Compared with conventional flaw detector, has the following advantages:

(1) detection speed digital ultrasonic flaw detector usually automatically detects, calculation, record, and some also have automatic depth sensitivity compensation and auto settings, the test speed, high efficiency.

(2) high measuring accuracy digital ultrasonic flaw detector on analog signal for high-speed data acquisition, measurement, calculation and evaluation, its detection accuracy higher than traditional instrument test results.

(3) the records and archives to detect digital ultrasonic flaw detector can provide inspection records until the defect images.

(4) high reliability, high stability digital ultrasonic flaw detector can be comprehensive and objective capture and store data, and collected data with real-time processing or reprocessing, signal-domain, frequency domain or image analysis, also available through pattern recognition on workpiece quality grading, reduces human factors, improving the reliability and stability of retrieved.

4 digital ultrasonic flaw detector of major technical issues

(1) analog-to-digital converter (ADC) ADC is the detector of ultrasonic signal input, the computer is the only way of continuously changing analog signals into digital signals.

(2) structure at the present time, there are full and analog digital mixed 2.

(3) the software digital ultrasonic flaw detector on the software side is varied, the flaw detector's success depends to a large extent on the degree of support software.

5 digital ultrasonic flaw detector development prospects

With electronic technology and the further development of the software, digital ultrasonic flaw detector has broad development prospects.

I believe that in the near future to image display-based detector will be in industrial inspection has been widely used.

At present, some digital ultrasonic flaw detector with a simple manual and scan feature to display the schematic is the section image test piece.

As technology advances, we are in the portable instrument to achieve phased array b-scan and c-scan imaging, make the inspection results like medical b-like Visual visible.

Defect characterization has always been a UT detection problems, development of modern artificial intelligence disciplines to implement instruments provides automatic defect characterization may, using pattern recognition technology and expert systems, to a large number of known defects of various characteristics of the input panel so that the instrument of acceptance of the human experience, and through learning and have the ability to automatically characterize defects.