Advantages of Digitized ultrasonic flaw detector

UT detecting technique as one of five industrial conventional nondestructive detecting technique,has been always widely used by people，in  the UT,the long-term used is A type pulse reflecting type digitized ultrasonic flaw detector。

Digitized ultrasonic flaw detector displayer displays electric pulse signal,flaw detection staff will distinguish flaw wave and other kinds of waves from these signal，its difficulty is considerable ，misjudge 、leakage judge is occurred very often ,seriously impede UT technique deeper application ,but with development of electronic technique,its achievement has been widely applied in UT industry,a digitized ultrasonic flaw detector is emerged at the right time。It makes UT technique produces revolutionary change,not only do real time record on ultrasonic signal ,but also display the properties of flaw wave。

2 working principle of digitized ultrasonic flaw detector 

Different from A type pulse flaw detector,digitized ultrasonic flaw detector has great change on circuit。

Digital signal handle is realized by procedure in computer，usually ,at first eliminate noise from signal ,secondly do dispose on signal that has been eliminated noise that UT detection needs,including gain control，attenuation compensation、signal route and so on。 Ultrasonic signal been amplified by receiving part,Using analog-digital converter changes into digital signal and transfers to computer,the position of transducer can be controlled by computer or operated by staffs, converter changes position into digital and then transfer to computer,then computer does proper handle on ultrasonic wave that changes along with time and position,get conclusion of furthering control flaw detection system，so as to set relevant parameter or display handling result 、graph on the screen、or print or give photoacoustic recognition and alerting signal。 

3  advantages of digitized ultrasonic flaw detection produce in section,

 Comparing to traditional detector,digitized ultrasonic flaw detector has as follow advantages：

● high accuracy quantitative、positioning ,satisfying closer and further distance flaw detection requirement。

●the near field blind area,satisfying small pipe diameter、thin wall tube flaw detection requirement;

●automatic calibration:automatic measurement zero point、K value、forefront of probe and acoustic speed of material;

●automatic display flaw echo position

●free to switch three kinds of scale plate

● Automatic gain、echo envelop 、peak value memory function to improve flaw detection efficiency

● Automatic record flaw detection process and do dynamic playback 

●Φ value calculation:straight probe forging piece flaw detection,pinpoint flaw highest wave automatic conversion hole diameter Φ 

●multiple independent flaw detection channel,can free to input and save any industry flaw detection standard，on-site detection does not need to bring sample

● free to save 、playback A scanning waveform and database

● DAC 、AVG curve automatically produced and sampling point is not restricted，and can revise and compensate

●B scanning function,clearly display flaw longitudinal section shapes

●can free to input any industry standard

●communicate with computer ,realize computer database management,and leading out flaw detection report of Excel form、A4 paper 

●IP65 standard aluminum magnesium alloy shell,sturdy and durable、waterproof and dustproof,great anti-interference capability

●take advantage of PC port communicating software can ungrade instrument system

●true color screen super bright display,adjustable brightness，suitable hard light、weak light 

●High properties safety environmental lithium battery supplying,can work up to seven hours continuously

● real time clock record:real time tracking record of flaw detection data、time and preserve

●power down protection ,save data and will not missed

●flaw detection parameter can automatic test and preset

●digital restrain ,not affect gain and linear    

●screen protection”automatic turn off”“words””free customized” and multiple screen protection mode can be changed freely

 ● gain compensation:revise on DB attenuation that result from surface roughness、curved surface 、thick workpiece  long distance flaw detection and so on factors

 ●PC port communicating software soft keyboard operation,realizing computer control flaw detector host to do flaw detection 

 ●angle  and K value input methods

 ●echo times analysis

 ●power source condition index

 ● strobe sound and light alarm

 ●DAC sound-light alarm

 ●freezing and thawing of screen

 ●time clock display

 ●dormancy and screen protection

4    main technique problems of digitized ultrasonic flaw detector 

(1) analog digital converter   ADC is inevitable road for ultrasonic signal input to computer of flaw detector,change continuous change analog signal into numerical signal 

(2)Currently , the structure has whole figure method and analog figure mixed

(3)software, digitized ultrasonic flaw detector is diverse involve in software， the success or failure of flaw detector to large extent depend on software supporting degree

5 developing prospect of digitized ultrasonic flaw detector  

 With the further development of electronic technique and software,digitized ultrasonic flaw detector has extended developing prospect。Believing in nearly future,based on picture displaying flaw detector will be widely applied in industry inspection。

Currently, some digitized ultrasonic flaw detectors,such as TM360 and TM260 ultrasonic flaw detector has equipped with simple manual and B scanning function,enable to display cross section images of being detected workpiece。With developing of technique,digitized ultrasonic flaw detector can realize phased alloy B scanning and C scanning imaging on portable instrument,digitized ultrasonic flaw detector can make flaw detection results directly visible like B-ultrasound used in hospital。Flaw qualitative always is difficult problem of UT inspection,modern artificial intelligence Development provides possibility for realizing instrument automatic flaw qualitative ,use mode recognition technique and professional system,input amount of known flaw with many features into system,make the instrument receives people’s experience,and after learning can equip with ability of automatic flaw qualitative 。