CN202928994U - Electromagnetic ultrasonic sensor - Google Patents
Electromagnetic ultrasonic sensor Download PDFInfo
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- CN202928994U CN202928994U CN 201220623377 CN201220623377U CN202928994U CN 202928994 U CN202928994 U CN 202928994U CN 201220623377 CN201220623377 CN 201220623377 CN 201220623377 U CN201220623377 U CN 201220623377U CN 202928994 U CN202928994 U CN 202928994U
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- electromagnetic ultrasonic
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- impedance matching
- ultrasonic sensor
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Abstract
The utility model discloses an electromagnetic ultrasonic sensor which comprises an electromagnet (101), an emitting and receiving coil (100) and a measured metal (102), wherein the electromagnet (101) is adhered to the emitting and receiving coil (100); the emitting and receiving coil (100) is placed on the measured metal (102); an excitation power supply (103) of the electromagnetic ultrasonic sensor comprises a signal generation circuit (200), a pulse string control circuit (201), a power amplification circuit (202) and an impedance matching circuit (203) which are sequentially connected with one another; and the output of the impedance matching circuit (203) is connected with an emitting coil. The electromagnetic ultrasonic sensor has the advantages that the number of pulse strings, the frequency and the phase of an excitation signal generated by the excitation power supply can be adjusted according to different conditions of the metal to be measured; and the emitting power is maximized through the impedance matching circuit, so that the electromagnetic ultrasonic conversion efficiency of the electromagnetic ultrasonic sensor can be maximized.
Description
Technical field
The utility model relates to electromagnetic acoustic nondestructive testing technique field, more particularly, relates to a kind of electromagnetic ultrasonic transducer.
Background technology
Electromagnetic ultrasonic transducer (EMAT) is a kind of novel ultrasound emission receiving trap.The process that electromagnetic acoustic produces and receives has transducer and medium surface noncontact, need not to add acoustic couplant, good reproducibility, detection speed advantages of higher.The shape and size that add the size of size and Orientation, high-frequency current of magnetic deflection field and frequency, coil by change can be controlled EMAT and produce the ultrasound wave of propagating along measured object.Utilize electromagnetic ultrasonic transducer can realize that surface crack and corrosion detect, and can realize underground buried tube and grounded screen material etc. not the long distance under cutting status detect.
But because the conversion efficiency of electromagnetic acoustic is very low, very high to the requirements such as ultrasonic receiver of powerful pulse power amplifier and high frequency high sensitivity, and realize that these require to exist some very formidable problems.The high-frequency high-power pulse amplifier will realize that voltage surpasses 1kV, and electric current surpasses 50A, and it is just very difficult that frequency reaches the above requirement of 1MHz.And for receiver, more than frequency reaches 1MHz, more than enlargement factor reaches 60dB, guarantee that again certain precision just acquires a certain degree of difficulty.Therefore the high electromagnetic ultrasonic transducer of conversion efficiency that designs electromagnetic acoustic is very important.
The utility model content
The technical problems to be solved in the utility model is, the low defective of conversion efficiency for the above-mentioned electromagnetic acoustic of prior art provides a kind of electromagnetic ultrasonic transducer.
The technical scheme that its technical matters that solves the utility model adopts is:
A kind of electromagnetic ultrasonic transducer, comprise electromagnet, transmit and receive coil, tested metal, electromagnet sticks on and transmits and receives on coil, transmitting and receiving coil is placed on tested metal, the excitation power supply of electromagnetic ultrasonic transducer comprises signal generating circuit, pulse train control circuit, power amplification circuit, the impedance matching circuit that is connected successively, and the output of impedance matching circuit is connected with transmitting coil.
Described signal generating circuit is made of the DDS chip, and the DDS chip is controlled by single-chip microcomputer.The Single-chip Controlling programmable logic device (PLD) is set train of impulses number, phase place and the frequency of the output of DDS chip.
Implement a kind of electromagnetic ultrasonic transducer of the present utility model, has following beneficial effect: can be according to the different situations of metal to be checked, the train of impulses number, frequency, the phase place that realize the pumping signal that excitation power supply produces are all adjustable, and by impedance matching circuit, emissive power is maximized, make the electromagnetic acoustic conversion efficiency of electromagnetic ultrasonic transducer realize maximizing.
Description of drawings
The utility model is described in further detail below in conjunction with drawings and Examples, in accompanying drawing:
Fig. 1 is a kind of electromagnetic ultrasonic transducer structural drawing of the utility model one embodiment;
Fig. 2 is the excitation power supply structural drawing of the utility model one embodiment;
Fig. 3 is power amplification circuit and the impedance matching circuit figure of the utility model one embodiment.
Embodiment
Understand for technical characterictic of the present utility model, purpose and effect being had more clearly, now contrast accompanying drawing and describe embodiment of the present utility model in detail.
As shown in Figure 1, the electromagnetic ultrasonic transducer of the utility model one embodiment comprises emission receiving coil 100, electromagnet 101, tested metal 102, and emission receiving coil 100 is positioned on tested metal 102, and electromagnet 101 is bonded on emission receiving coil 100.
Electromagnet 101 adopts the rare earth material neodymium iron boron to make, and intensity and the homogeneity in order to strengthen magnetic field, select two magnetic circuits that bias magnetic field is provided simultaneously.
Emission receiving coil 100 manufacturing technologies adopt the winding displacement technology.
As shown in Figure 2, the excitation power supply 103 of the electromagnetic ultrasonic transducer of the utility model one embodiment comprises: the signal generating circuit 200, pulse train control circuit 201, power amplification circuit 202, the impedance matching circuit 203 that are connected successively, the output of impedance matching circuit 203 is connected with transmitting coil.
Described signal generating circuit 200 comprises DDS chip AD9850, and the pulse signal frequency of its generation and pulse number are controlled DDS chip AD9850 by single-chip microcomputer.Single-chip Controlling FPGA (Field Programmable Gate Array) control MAX7064 completes the setting of train of impulses number, frequency, phase place.Realization is determined optimum frequency and pulse number according to crackle and/or the corrosion condition of metal to be checked, improves the conversion efficiency of electromagnetic acoustic.Single-chip microcomputer and host computer carry out serial communication, realize the output of FPGA (Field Programmable Gate Array) control and the control of AD9850 chip.
For example, in the electromagnetic supersonic flaw detecting of reinforcing bar, if the selection diameter is 20mm, hinder the 3mm that the degree of depth is wall thickness, length 20mm, the train of impulses number is 5, can reach maximum conversion efficiency when frequency is 120KHz, the signal intensity that receiving coil receives is the strongest.
Pulse train control circuit 201 is comprised of signal generator circuit and driving circuit, and the pulse signal power that signal generating circuit is produced amplifies.
Power amplification circuit 202 adopts high power valve (MOSFET) to form the half-bridge power amplifying circuit.Impedance matching circuit 203 adopts the Broadband Matching of utilizing line transformer to realize, and line transformer is comprised of twisted-pair feeder and magnet ring.
As shown in Figure 3, the power amplification circuit 202 of the utility model one embodiment and the circuit diagram of impedance matching circuit 203, wherein impedance matching circuit 203 is comprised of line transformer T1 and capacitor C 3.Power amplification circuit 202 is by bridge balance resistance R1, R2, brachium pontis capacitor C 1, C2, and bridge switch absorbing circuit element D1, D2, high power valve (MOSFET) Q1, Q2 form.The principle of work of power amplification circuit 202 is: two anti-phase square wave excitation signals are received respectively the base stage of two switching tubes, when HO is high level, when LO is low level, the Q1 conducting, Q2 closes, electric current is by Q1 2 chargings to primary to capacitor C, and the electric charge on C1 discharges to Q1 and primary simultaneously, thereby in positive half period pulse voltage of output transformer secondary induction; When HO is low level, when LO is high level, the Q2 conducting that is triggered, Q1 closes, electric current is by capacitor C 1 and primary charging, and the electric charge of C2 is responded to a negative half-cycle pulse voltage also via the primary discharge at transformer secondary output, thereby forms the power amplification waveform in a frequency of operation cycle.Semi-bridge inversion output is connected on transmitting coil after the line transformer misfortune is closed.
A kind of electromagnetic ultrasonic transducer of the present utility model, by single-chip microcomputer, train of impulses number, phase place and the frequency of signal generating circuit being carried out adjustable control realizes adopting different excitation parameters for different tested metals, and pulse signals is carried out impedance matching, improves the conversion efficiency of electromagnetic ultrasonic transducer.
The above is described embodiment of the present utility model by reference to the accompanying drawings; but the utility model is not limited to above-mentioned embodiment; above-mentioned embodiment is only schematic; rather than restrictive; those of ordinary skill in the art is under enlightenment of the present utility model; not breaking away from the scope situation that the utility model aim and claim protect, also can make a lot of forms, within these all belong to protection of the present utility model.
Claims (2)
1. electromagnetic ultrasonic transducer, comprise electromagnet (101), transmit and receive coil (100), tested metal (102), electromagnet (101) sticks on and transmits and receives on coil (100), transmitting and receiving coil (100) is placed on tested metal (102), it is characterized in that, the excitation power supply of described electromagnetic ultrasonic transducer (103) comprises the signal generating circuit (200) that is connected successively, pulse train control circuit (201), power amplification circuit (202), impedance matching circuit (203), the output of impedance matching circuit (203) is connected with transmitting coil.
2. a kind of electromagnetic ultrasonic transducer according to claim 1, is characterized in that, described signal generating circuit (200) is made of the DDS chip, and the DDS chip is controlled by single-chip microcomputer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220623377 CN202928994U (en) | 2012-11-22 | 2012-11-22 | Electromagnetic ultrasonic sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220623377 CN202928994U (en) | 2012-11-22 | 2012-11-22 | Electromagnetic ultrasonic sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202928994U true CN202928994U (en) | 2013-05-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220623377 Expired - Lifetime CN202928994U (en) | 2012-11-22 | 2012-11-22 | Electromagnetic ultrasonic sensor |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104122330A (en) * | 2014-07-22 | 2014-10-29 | 华中科技大学 | Pipeline defect detection method and device based on electromagnetic ultrasonic longitudinal guided waves |
| CN106124621A (en) * | 2016-06-13 | 2016-11-16 | 华中科技大学 | A kind of electron beam fuse that is applicable to increases the electromagnetic acoustic monitoring system that material manufactures |
| CN106824736A (en) * | 2017-01-09 | 2017-06-13 | 北京科技大学 | A kind of electromagnetic acoustic Lamb wave transducer based on magnetostriction mechanism |
| CN109239205A (en) * | 2017-07-10 | 2019-01-18 | 中国特种设备检测研究院 | Electromagnetic ultrasonic transducer controls equipment, method and device |
| CN113933398A (en) * | 2021-10-26 | 2022-01-14 | 中国石油化工股份有限公司 | Electromagnetic ultrasonic sensor drive optimization method based on impedance analysis method |
-
2012
- 2012-11-22 CN CN 201220623377 patent/CN202928994U/en not_active Expired - Lifetime
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104122330A (en) * | 2014-07-22 | 2014-10-29 | 华中科技大学 | Pipeline defect detection method and device based on electromagnetic ultrasonic longitudinal guided waves |
| CN104122330B (en) * | 2014-07-22 | 2016-08-17 | 华中科技大学 | Defect inspection method and apparatus based on electromagnetic acoustic longitudinal wave guide |
| CN106124621A (en) * | 2016-06-13 | 2016-11-16 | 华中科技大学 | A kind of electron beam fuse that is applicable to increases the electromagnetic acoustic monitoring system that material manufactures |
| CN106124621B (en) * | 2016-06-13 | 2019-06-11 | 华中科技大学 | A kind of electromagnetic acoustic monitoring system suitable for electron beam fuse increasing material manufacturing |
| CN106824736A (en) * | 2017-01-09 | 2017-06-13 | 北京科技大学 | A kind of electromagnetic acoustic Lamb wave transducer based on magnetostriction mechanism |
| CN106824736B (en) * | 2017-01-09 | 2019-05-03 | 北京科技大学 | A kind of electromagnetic acoustic Lamb wave energy converter based on magnetostriction mechanism |
| CN109239205A (en) * | 2017-07-10 | 2019-01-18 | 中国特种设备检测研究院 | Electromagnetic ultrasonic transducer controls equipment, method and device |
| CN109239205B (en) * | 2017-07-10 | 2024-04-09 | 中国特种设备检测研究院 | Electromagnetic ultrasonic sensor control equipment, method and device |
| CN113933398A (en) * | 2021-10-26 | 2022-01-14 | 中国石油化工股份有限公司 | Electromagnetic ultrasonic sensor drive optimization method based on impedance analysis method |
| CN113933398B (en) * | 2021-10-26 | 2024-03-15 | 中国石油化工股份有限公司 | Electromagnetic ultrasonic sensor driving optimization method based on impedance analysis method |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130508 |
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| CX01 | Expiry of patent term |