EMAT-8, Multi Channel EMAT System - Quality Network - #1

Qnet

The 8-Channel EMAT equipment consists of two main components described below.

1. Base Unit, including:

• Synthesizer board

• Burst generator board (frequency range: 0.4 - 4MHz); burst length (number of cycles) and frequency are adjustable via PC

• Four receiver boards with eight delayed receiver channels (delay time of all channels can be modified separately), including preamplifier and filters

• Output amplifier and video unit (LCD color monitor)

• AT-compatible PC for system parameter control

• Power supplies

2. Front End, including:

• Eight transmitter power stages for EMAT transducers or transmitter and receiver boards for piezoelectric transducers

• Transducer(s) and transducer cable(s)

• Power supplies

General System Data

• Frequency range....................................................0.4 to 4.0MHz, adjustable in 10kHz increments

• Burst duration..........................................................1 - 15 cycles, adjustable in 1 cycle increments

• Pulse repetition rate.................................... 2500p.sec to 20msec, adjustable in 1p.sec increments

• Delay time................................................................0 to 25p.sec, adjustable in 25nsec increments

• Total amplification..........................................................50dB, 40dB adjustable in 1dB increments

Controllable System Functions:

• Trigger mode selection................................................................internal, external, software trigger

• Transducer selection...................................................................2x 4-segments, or 1x 8-segments

• Pulse repetition rate and ultrasonic frequency

• Number of cycles/burst

• Delay time for each transmitter and receiver channel

• Filter selection..........................................................0.4 - 1.3MHz, 0.8 - 2.3MHz and 2.0 - 4.0MHz

• Frequency settings.......................................................................................................0.4 to 4MHz

• Burst duration...................................................................1 - 15 cycles, adjustable in 1 cycle steps

• Receiver attenuator..............................................................30dB, adjustable in 10dB increments

• Receiver amplifier...................................................................40dB, adjustable in 1dB increments

8-Channel EMAT

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