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How Does Phased Array Work?

Apr. 06, 2022

Phased array ultrasonic inspection (PAUT), also known as phased array UT, is an advanced NDT technique that uses a set of ultrasonic inspection (UT) probes composed of numerous small elements. Each of these is pulsed individually by computer-calculated timing to create phased aspects of the process, while an array refers to the multiple elements that make up a PAUT system.

 

The phased array probe emits a beam that can be focused and swept electronically across the inspection piece without moving the probe itself. This is in contrast to single-element probes (also known as monolithic probes). These more traditional probes require physical movement or rotation to cover a larger area, whereas PAUTs do not.

 

Phased array ultrasonic inspection is based on wave physics principles and has applications in areas such as optical and electromagnetic antennas.

Multi-function Phased Array Ultrasonic Flaw Detector HS PA20-Aex

Multi-function Phased Array Ultrasonic Flaw Detector HS PA20-Alex

How does phased array work?

As mentioned above, phased-array ultrasonic flaw detection probes are composed of several piezoelectric crystals that transmit/receive independently at different times. The ultrasonic beam is focused using a time delay that is applied to the element to produce phase length interference in the wavefront. This interference allows the energy to be focused at any depth and angle in the specimen.

 

The principle of phased array technology is to activate all or some of the transducer elements at each shot, and these transducer elements collectively contribute to the generation of the beam under a suitable delay law.


HS PA20-Fx Ultrasonic Flaw Detector is a high-end phased array flaw detector, which is specially developed for the high-end detection requirements of the market. The Ultrasonic Flaw Detector has 64/128 detection channels, which can detect complex structures or materials such as ultra-thick carbon steel and honeycomb plate. Matching a double crystal matrix array probe can solve the problem of thick stainless steel detection. The HS PA20-Fx Ultrasonic Flaw Detector can be equipped with two groups of TOFD detection channels, which can scan the weld with a thickness of 100 mm at one time.

HS PA20-Fx Multi-function Phased Array Ultrasonic Flaw Detector

HS PA20-Fx Multi-function Phased Array Ultrasonic Flaw Detector

Electronic scanning

The beam is electronically converted by alternately firing a specific number of elements of a linear or circular phased array transducer.

This technique is an alternative to the mechanical translation of single-element probes.

 

Advantages 

Faster inspection

No mechanical movement or reduced number of scan lines required

Possible to combine with electronic focusing and beam steering

 

Electronic focusing

The beam is electronically focused by applying a symmetrical delay method to different elements of a linear or circular phased array transilluminator.

This technique is an alternative to using several sensors focused at different depths.

 

Advantages

Only one probe needs to be focused at each depth

Detection of thick parts can be faster due to dynamic focusing

Electronic focusing compensates for focusing deviations caused by refraction at the interface.

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Electronic steering

The beam is electronically deflected by applying a delay method to the different elements of a linear, circular, or matrix array. Linear and circular arrays allow two-dimensional beam steering, while matrix arrays allow three-dimensional steering.

This technique is an alternative to using several sensors with different angles.

 

Advantages

Different angles can be detected with only one transducer

Faster detection of parts with complex geometries

The technique can be combined with an electronic focusing


Fully parallel

All elements of the transducer are activated in each slot, with or without low delay, to ionize the entire cut surface of the inspected part or to concentrate the energy in selected areas.

HS PA20-Ex Multi-function Phased Array Ultrasonic Flaw Detector

 HS PA20-Ex Multi-function Phased Array Ultrasonic Flaw Detector

Reception is also performed using all the elements of the transducer. Advanced processing is then performed electronically to create an image of the part on the incident side of the transducer.

 

The advantage of this technique is that it is very fast because it requires only one ultrasonic lens to examine an incision, whereas conventional phased array techniques require linear, circular, or angular scanning, with ultrasound for each lens.


Zhongke Innovation has been committed to providing the market users with various kinds of all-round, efficient, steady, reliable, safe, and environment-friendly nondestructive testing solutions and products, and providing special market users with customized personalized services to help the industries such as petroleum, chemical industry, metallurgy, electric power, aviation, aerospace, railway, military industry, ship, automobile, and new materials to continuously improve technology process, enhance product quality and continue to increase enterprise benefits. 


Let us help you find the suitable phased array ultrasonic flaw detector for your project. When you contact us, please provide your detailed requirements. That will help us give you a valid quotation. 

 

 


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