A.U.D.I

Acoustic Underwater Development Instrument


A.U.D.I


The A.U.D.I – Acoustic Underwater Development Instrument was designed for laboratory work at the request of University marine engineering departments, and Oceanographic underwater research establishments. The A.U.D.I provides access to a wide range of transducer drive signals which can be preset (Cal), or continuously variable (Var).


A built-in, dual channel, high resolution data acquisition Signal Analyzer*, with an arbitrary waveform generator, enables all signals to be monitored/analysed. The A.U.D.I software creates a full range of virtual instruments – Oscilloscope, Spectrum Analyzer, Multimeters,

Transient Recorder (data logger) – on a Windows OS PC/laptop display.


The A.U.D.I can also be used for SONAR/ASW training, as a demonstrator, and to give students hands-on experience with real-time Active/Passive SONAR configurations.

A.U.D.I Features:

  • Integrated high resolution (12 bits) PC Data Acquisition *Signal Analyzer & AWG.

  • Variable/Calibrated Pulse Repetition Frequency (PRF) – for ranges <.5 meter – >6 meters.

  • Variable/Calibrated Pulse Width (PW) Continuous or Single shot <2 µsecs – >4 msecs.

  • Variable CW Oscillator – <12 kHz – >700 kHz.

  • Four Calibrated (preset) CW Oscillator outputs – 200 kHz, 100 kHz, 40 kHz, 20kHz.

  • Frequency display – four digits.

  • FM Modulation output – 50 Hz to 110 Hz @ 2v pk-pk.

  • Switched Gate & Sync Output @ TTL level.

  • Three transducer drive amplifiers Tx1, 2, 3 with variable Gain.

  • Variable Phase, plus cascade Phase on Tx 2 and Tx 3, referenced to Tx 1 Output.

  • Three High Voltage parallel outputs – 40 volts pk-pk max.

  • Auxiliary Amplifier with three inputs, and x4 Gain control.

  • Three fixed gain (x 4) general purpose amplifiers ‘A’.

  • Motor Speed control voltage – 0 to 12 volts dc at >1 amp.

  • Access to +5, -5, +15, -15 volts dc for external R&D circuitry.

Signal Analyzer in brief:

  • PC/laptop, dual channel Data Acquisition Signal Analyzer – USB

  • Sample rate – 500 Ms/sec

  • Resolution – 14 and 16 bit

  • Windows OS 10

  • ASCII data files for exporting to other applications

  • Oscilloscope, Spectrum Analyzer, True RMS Voltmeter

  • Transient Recorder (Data Logger) – 21 minutes to 750 days

  • Spectrum lin/log and volts/dB axis

  • FFT Windows – Rectangle, Hanning, Hamming, Blackman, Bartlett

  • FFT points – 16 to 32,768

  • Arbitrary Waveform Generator (AWG) – 14 bit resolution.

  • AWG Frequency range – 1μHz to 40 MHz

  • Output impedance – 50 Ohms

  • Output signal amplitude – >24 volts pk-pk

  • Sine, Square, Triangle, White Noise, DC, and User Defined waveforms

  • Variable Symmetry (Mark to Space ratio)– 1 to 99% in 1% steps

  • Frequency Sweep control