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Drive Phased Arrays of EMATs at high powers

RITEC MEDARS

MULTIPLE EMAT DRIVER AND RECEIVER SYSTEM

MEDARS Overview

 Drive up to 8 Electromagnetic Acoustic Transducers (EMATs) with precise control of phasing between transmitters  Very High Power (up to 10 KW)  Unique Bipolar Square Wave Pulse  Low Noise Broadband Receiver  Adjust phase delay with sub nanosecond resolution

MEDARS Overview

Frequency & Phase Control Delay & Width Control Output Level Control Frequency Synthesizer Logic & Timing Circuitry High Power Bipolar Square Wave Pulser Impedance Match EMAT Device Under Test EMAT Gain, Input Selection, & Bandwidth Control Receiver RF Output To Oscilloscope Or Data Acquisition System

MEDARS Features & Benefits

 Unique Bipolar Square Wave Burst

Trigger Positive Pulse Driver Negative Pulse Driver Bipolar Square Wave Output Adjustable up to 800 VPP ~ 5 Ohm Output Impedance The frequency is adjustable using a separate direct digital synthesizer as a clock.

Pulse width adjustable from one to 250 cycles

MEDARS Features & Benefits

 Precise control of Phasing and delays between transmitter pulses

Synthesizer 1 (Frequency Resolution .006 Hz) Synthesizer N Phase Shift (12 bit or .088 degree control) Delay Range = 0 - 20 microseconds Delay Resolution = 0.24 nsec at 1 MHz

MEDARS Features & Benefits

 Adjust phase delays for constructive interference between transmitters  improves signal-to-noise  adjust for beam focusing or direction control

MEDARS Features & Benefits

Receiver Output Arbitrary delay for transmitters 2-5 0.0

-0.3

-0.5

-0.8

-1.0

-1.3

-1.5

-1.8

1.8

1.5

1.3

1.0

0.8

0.5

0.3

Trans m itter 1-5 only Trans m itters 1 only Trans m itters 1 & 2 Trans m itters 1,2 &3 Transm itters 1-4 120.0

130.0

140.0

Time (microseconds)

MEDARS Features & Benefits

 High Efficiency, Low Output Impedance u u 4 n e 0 0 0 0 0 0 T r )

MEDARS Features & Benefits

 Generate High Currents in EMAT 800V peak to peak drive into impedance matched EMAT 150.0

125.0

100.0

75.0

50.0

25.0

0.0

-25.0

-50.0

-75.0

-100.0

-125.0

0.0

5.0

10.0

15.0

Time (microseconds) 20.0

MEDARS Applications

 Provides high power outputs (~9KW) into impedance matched EMATs  Efficient transmitter allows smaller size and permits up to 8 transmitters and receivers in a single instrument  Ideal for industrial applications such as flaw detection, weld evaluation

MEDARS Applications

 Ideal for industrial applications such as flaw detection, weld evaluation R g 1 n n v 1mm hole 30 cm EMAT Arra y 0 0 0 T o )

MEDARS Transmitter Specifications

 Frequency Range: 250 kHz to 5 MHz  Output Amplitude: 0 V to 800 V peak to peak into 50 Ohms with 12 bit range of adjustment; 440 V peak to peak into 5 Ohm load.

 High Power: up to 9.7 KW into 5 Ohms  Burst Width: adjustable to 250 cycles  Independent control of pulse amplitude and delay for 8 transmitters

MEDARS Receiver Specifications

 Up to eight high Gain (95 dB) broadband receivers with low noise preamplifiers  Two receiver inputs for through transmission and pulse/echo with a single EMAT  Adjustable high pass and low pass filters  Frequency range: 250 kHz to 5 MHz  Output linear to 2V peak to peak  Multiplexed and summed outputs available