Ultrasound and traditional piezoelectric ultrasound belong to the category of ultrasound, and their essential difference lies in the different transducers, that is, different transmission and reception methods. Piezoelectric ultrasound transducers rely on the piezoelectric effect of piezoelectric wafers to transmit and receive ultrasonic waves. Yes, its energy conversion is performed on the wafer. EMAT uses electromagnetic effects to transmit and receive ultrasound. The advantages of electromagnetic ultrasound are that it does not require coupling, generates various waveforms flexibly, has low requirements on the surface quality of the workpiece to be probed, has a fast detection speed, has a long acoustic wave propagation distance, and finds natural defects The ability to obtain these advantages is at the cost of relatively low operating efficiency. It is necessary to have a high emission current and a low noise receiver and carefully adjust the electrical matching to overcome this shortcoming. RITEC and many well-known research institutions (NASA) , Bell Labs, Boeing, GE, etc.) Through decades of research and continuous improvement, the developed ultrasonic instrument has extremely high output power and can receive detection signals under low signal-to-noise ratio. The EMAT signal received when the RITEC company developed the high-energy ultrasound system product as the excitation signal for the echo method to detect the rail is as follows:
Electromagnetic ultrasound research solution 1:
High-energy ultrasonic main system (customized according to demand, can be customized as single channel, multi-channel, or even EMAT array. Computer control, manual control, output power, optimal frequency can be customized according to demand, such as: PRP-4000, RAM-5000)
System debugger (for system inspection and test debugging)
EMA accessories package (customized according to requirements, including impedance matching, duplexer, filter device, signal sampler, etc.)
EMAT (customized according to demand)
EMAT impedance matching and signal optimization device (used for circuit impedance matching and optimizing EMAT signal, composed of transmitter device and receiver device, EMAT test must be equipped)
Oscilloscope (observing and monitoring time-domain signals)
Electromagnetic ultrasound research solution 2:
Electromagnetic ultrasound does not require coupling, the test method is relatively simple and the measurement is fast and accurate, and the electromagnetic resonance (EMAR) method is easier to meet the non-destructive evaluation of metal sheet damage
Non-linear ultrasonic testing main system (customized according to requirements, the number of channels is optional, and the optimal frequency range is optional)
SNAP accessories package (customized according to experiment, including impedance matching, attenuation configuration, filter device, duplex device, sampler, signal amplification device, etc.)
EMA accessories package (customized according to requirements, including impedance matching, duplexer, filter device, signal sampler, etc.)
EMAT (customized according to demand)
Oscilloscope (observing and monitoring time-domain signals)
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