Main performance advantages of digital ultrasonic flaw detector

Digital signal processing is implemented in a computer using a program. Usually, the first thing to do is to remove the noise from the signal, and then to perform the processing required for UT detection on the signal that has been de-noised, including gain control, attenuation compensation, and signal packet routing. After the ultrasonic signal is amplified by the receiving part, it is converted into a digital signal by the analog-to-digital converter and transmitted to the computer. The position of the transducer can be controlled by the computer or manually operated, and the converter converts the position into a digital signal and transmits it to the computer. The computer then appropriately processes the ultrasonic waveform that changes with time and position, and draws a conclusion for further controlling the flaw detection system, and then sets relevant parameters or displays the processing result waveform, motor test graph, etc. on the screen, prints it out, or gives light, sound recognition and alarm signals.
Reliability and stability of retrieval.
　　Main technical issues of digital ultrasonic flaw detectors
　　(1) Analog-to-digital converter (ADC): ADC is the only way for the ultrasonic signal of the flaw detector to enter the computer, converting the continuously changing analog signal into a digital signal.
　　(2) Structure: At present, there are two types: full digital mode and analog-digital hybrid.
　　(3) Software: There are many different software for digital ultrasonic flaw detectors, and the success or failure of the flaw detector depends largely on the support of the software.
Compared with traditional flaw detectors, digital ultrasonic flaw detectors have the following advantages:
　　(1) Fast detection speed. Digital ultrasonic flaw detectors can generally automatically detect, calculate, and record. Some can also automatically perform depth compensation and automatically set sensitivity, so the detection speed is fast and the efficiency is high.
　　(2) High detection accuracy. Digital ultrasonic flaw detectors perform high-speed data acquisition, quantification, calculation, and discrimination on analog signals. Their detection accuracy can be higher than the detection results of traditional instruments.
　　(3) Recording and archival detection. Digital ultrasonic flaw detectors can provide detection records and even defect images. High reliability and good stability. Digital ultrasonic flaw detectors can comprehensively and objectively collect and store data, and perform real-time or post-processing on the collected data, perform time domain, frequency domain or image analysis on the signal, and can also grade the quality of workpieces through pattern recognition, reducing the impact of human factors.