Focal length adjustable type electromagnetic ultrasonic phased array transducer
An electromagnetic ultrasonic and transducer technology, which is used in the generation of ultrasonic/sonic/infrasonic waves, and the use of vibrating fluids.
Pending Publication Date: 2019-05-17
NCS TESTING TECH
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Problems solved by technology
For example, Chinese invention patent application No. 201710942500.0 discloses 'an electromagnetic ultrasonic phased array transducer' (application date 2017.10.11), which includes permanent magnets, multi-channel coils, shielded wires and plugs; The multi-channel coil is fixed under the permanent magnet; one end of the shielded wire is connected to the multi-channel coil, and the other end of the shielded wire is connected to the plug, but no means for adjusting the focus is provided
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[0038] Example-The transducer is used for the detection of forgings or billets:
[0039] In the transducer probe coil 4 ( image 3 In ), a high-frequency pulse train driving signal with a constant phase difference can be used to excite a pure transverse wave with a certain focal length, thereby realizing transverse wave focusing detection, and the detection sensitivity near the focus is the highest. When the focus position needs to be changed, only the phase of the current drive signal (that is, the relative delay Δt) needs to be changed to obtain a focused sound field with different focal lengths (that is, sensitivity regions).
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Abstract
The invention belongs to the technical field of ultrasonic nondestructive detection, and particularly relates to a focal length adjustable type electromagnetic ultrasonic phased array transducer for ultrasonic detection. The transducer comprises a permanent magnet (2) and an electromagnetic ultrasonic coil (4) which work in cooperation with a detected workpiece (6), the electromagnetic ultrasoniccoil (4) is attached to the outer surface of the detected workpiece (6), the electromagnetic ultrasonic coil (4) is composed of a plurality of independent coils of concentric circles with different diameters, a probe shell (1) is arranged outside the permanent magnets (2), a thin copper sheet (3) is arranged between the permanent magnet (2) and the electromagnetic ultrasonic coil (4), in the plurality of independent coils of concentric circles with different diameters, an adjustable relative delay delta t is formed between excitation currents of an inner ring coil and an outer ring coil. According to the focal length adjustable type electromagnetic ultrasonic phased array transducer, a phased array technology is applied into the electromagnetic ultrasonic transducer so that the effect of the electronically adjusting the focal length of the probe can be realized by changing the current phase of each coil, so that the application of the electromagnetic ultrasonic technology is wider.
Description
Technical field [0001] The invention belongs to the technical field of ultrasonic nondestructive testing, and specifically relates to an electromagnetic ultrasonic phased array transducer with adjustable focal length for ultrasonic testing. Background technique [0002] The traditional piezoelectric ultrasonic transducer is based on the piezoelectric effect principle of the piezoelectric crystal to excite the ultrasonic wave. It must pass through the acoustic coupling medium such as water or oil to transmit the ultrasonic wave into the inspected workpiece. In many fields, piezoelectric ultrasonic has encountered difficulties. Overcome the difficulties, so the electromagnetic ultrasonic testing technology without coupling medium came into being. [0003] The difference between electromagnetic ultrasonic flaw detection technology and traditional piezoelectric ultrasonic flaw detection technology is only in the way of generating ultrasonic waves. The electromagnetic ultrasonic transdu...
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IPC IPC(8): B06B1/04G01N29/34
Inventor 童凯魏志辉张建卫范弘刘涛刘光磊徐磊朱国庆李艇王宏亮
Owner NCS TESTING TECH
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