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Electromagnetic acoustic transducer

An acoustic sensor, electromagnetic technology, applied in scientific instruments, instruments, material analysis using sonic/ultrasonic/infrasonic waves, etc., can solve problems such as safety and infeasibility, and achieve the effect of simplifying layout and fixing

Active Publication Date: 2017-09-26
PERMASENSE
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  • Abstract
  • Description
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Problems solved by technology

However, this method is not feasible in some installations due to safety reasons

Method used

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Examples

Experimental program
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Effect test

Embodiment Construction

[0052] figure 1 An exemplary detection object 2 in the form of a steel pipe is schematically shown, the electromagnetic-acoustic sensor 4 is magnetically attracted to, elastically clamped to the curved surface of the pipe 2 and / or a surrounding clamping device (which passes around the pipe 2) One or more of them are held to the surface of the pipeline 2, and the detection object will be subjected to internal erosion monitoring, defect detection, etc. using the electromagnetic acoustic sensor 4. The sensor 4 is battery driven (may also use mains power or energy harvesting devices) and communicates wirelessly with a remote monitoring system 6 that receives and interprets the ultrasonic inspections of the pipeline 2 periodically performed by the sensor 4 . Pipe 2 may have a non-conductive coating to inhibit external corrosion. For example, the pipe 2 can be coated with such a coating. Despite this non-conductive coating, the electromagnetic-acoustic sensor 4 is able to excite a...

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Abstract

An electromagnetic acoustic transducer (4) includes a flux guide (8) surrounded by one or more permanent magnets (10) abutting side faces of the flux guide (8). The magnetic field from the permanent magnets (10) enters the flux guide (8) where repulsion between the magnetic fields directs at least a portion of the magnetic fields toward a test face abutting a test object (2). The flux density at the test face is greater than the flux density within the originating permanent magnets (10). An active portion of a coil (12) disposed between the flux guide (8) and the test object contains conductors that are substantially straight, parallel and carry current in the same direction in order to provide substantially mode pure and uni-directionally polarised excitation of shear waves within the test object.

Description

technical field [0001] The present disclosure relates to the field of electromagnetic acoustic sensors. Background technique [0002] Traditional ultrasonic testing requires the use of a coupling fluid between the sensor and the testing structure. Electromagnetic Acoustic Transducers (EMAT) are popular because they do not require a coupling liquid or even direct contact between the sensor and the detection object. This characteristic is beneficial, for example, in the case of erosion monitoring where detection through an erosion protective layer such as paint is required. However, these advantages of EMATs come with the disadvantage that EMATs generally have lower sensitivity. To address this lower sensitivity problem, one approach is to use a high power excitation signal and a high power excitation voltage within the EMAT. However, this approach is not feasible in some installations for safety reasons. Contents of the invention [0003] According to one aspect of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B06B1/04G01N29/24
CPCB06B1/04G01N29/2412B06B1/08G01N2291/0422
Inventor 弗雷德里克·伯特·赛格拉胡里奥·阿古斯丁·伊斯拉·加西亚
Owner PERMASENSE
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