Low frequency electromagnetic ultrasonic guided-wave receiving signal amplifying method and device
An electromagnetic ultrasonic and receiving signal technology, which is applied in the detection of response signals, analysis materials, instruments, etc., can solve the problems of inability to accurately detect low-frequency electromagnetic ultrasonic guided wave reception signals, and achieve the solution of inability to accurately detect low-frequency electromagnetic ultrasonic guided wave reception. signal, accurate detection of low-frequency electromagnetic ultrasonic guided wave receiving signal effect
Active Publication Date: 2016-05-11
CHINA SPECIAL EQUIP INSPECTION & RES INST +1
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[0006] Embodiments of the present invention provide a method and device for amplifying received signals of low-frequency electromagnetic ultrasonic guided waves to solve the technical problem in the prior art that the received signals of low-frequency electromagnetic ultrasonic guided waves cannot be accurately detected
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[0027] In order to enable those skilled in the art to better understand the solutions of the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only It is an embodiment of a part of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.
[0028] It should be noted that the terms "first" and "second" in the description and claims of the present invention and the above drawings are used to distinguish similar objects, but not necessarily used to describe a specific sequence or sequence. It is to be understood that the data so used are interchangeable under appropriate ...
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The invention discloses a low frequency electromagnetic ultrasonic guided-wave receiving signal amplifying method and device. The device comprises a protection circuit, a multistage amplifying circuit and multiple clamping circuits; the protection circuit is used for limiting an amplitude value of an initial high voltage signal in an initial target signal and outputting a first target signal; the multistage amplifying circuit is used for amplifying the detected first target signal, wherein the multistage amplifying circuit comprises at least three stages of amplifying circuits, all stages of amplifying circuits in the multistage amplifying circuit are connected in series in sequence, and the amplified first target signal is used for detecting the damage degree of a detected material; each clamping circuit in the multiple clamping circuits is used for limiting the amplitude of the high voltage signal output by the parallel amplifying circuit, wherein each stage of amplifying circuit in the multistage amplifying circuit is connected with one clamping circuit in parallel. The method and device solve the technical problem that a low frequency electromagnetic ultrasonic guided-wave receiving signal cannot be accurately detected in prior art.
Description
technical field [0001] The invention relates to the field of non-destructive testing, in particular to a method and device for amplifying received signals of low-frequency electromagnetic ultrasonic guided waves. Background technique [0002] In recent years, the long-distance and large-scale detection of conductive or magnetic conductive structures such as aluminum-magnesium alloy plates for aviation, metal pipes for petroleum and chemical industries, and metal bottom plates for pressure vessels for special equipment can be realized through low-frequency ultrasonic guided wave technology. Compared with traditional piezoelectric transducers, using electromagnetic ultrasonic transducers as transducers for low-frequency guided wave detection has the advantages of non-contact, no coupling agent, good repeatability, and convenient quantitative measurement. However, when the electromagnetic ultrasonic transducer is used to receive the guided wave scattering signal, due to the lim...
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Login to View More IPC IPC(8): G01N29/36
CPCG01N29/36G01N2291/0234
Inventor 郑阳周进节
Owner CHINA SPECIAL EQUIP INSPECTION & RES INST