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Differential membrane hydrophone
Precision Acoustics Ltd manufactures a wide range of hydrophones the ultrasonic
frequency range.
hydrophone, ideally suited for measurements of broadband ultrasonic signals in the
500 kHz to 100 MHz range. The Differential membrane hydrophone is designed to be
used in conjunction with a dedicated power supply that powers the fully differential
internal preamplifier. The two items are supplied as a complete system by Precision
Acoustics Ltd. Wherever the properties of the hydrophone are stated, they relate to
the hydrophone/power-supply combination (a hydrophone system).
Precision Acoustics Ltd
Hampton Farm Business Park, Higher Bockhampton, Dorchester, Dorset DT2 8QH, UK
t.
+44 (0) 1305 264669
e.
office@acoustics.co.uk
The Differential membrane hydrophone is a gold-standard
Document version
2.2
w.
acoustics.co.uk
PRODUCT INSTRUCTIONS
Date of issue
17/03/2020
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Summary of Contents for Precision Acoustics DPSU
- Page 1 PRODUCT INSTRUCTIONS Differential membrane hydrophone Precision Acoustics Ltd manufactures a wide range of hydrophones the ultrasonic frequency range. The Differential membrane hydrophone is a gold-standard hydrophone, ideally suited for measurements of broadband ultrasonic signals in the 500 kHz to 100 MHz range. The Differential membrane hydrophone is designed to be used in conjunction with a dedicated power supply that powers the fully differential internal preamplifier.
- Page 2 NPL, London over the frequency range 300 kHz to 60 MHz. Further information on making acoustic measurements with hydrophones can be found on our website (http://www.acoustics.co.uk). In addition, Precision Acoustics Ltd offers training courses covering many aspects of acoustic measurement techniques and practices.
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Page 3: Preparing For Measurement
PREPARING FOR MEASUREMENT Mounting the hydrophone Hydrophones should be secured in a fixture that ensures the hydrophone can be moved around in a water tank to align it with the acoustic source. This could be a simple mount that secures the hydrophone via the two locating holes in the membrane ring or a more comprehensive mount capable of providing rotational adjustment. - Page 4 Connecting the hydrophone system MEMBRANE HYDROPHONE Bespoke cable on membrane hydrophone MEMBRANE HYDROPHONE PSU 50 Ω BNC cable 50 Ω INPUT DATA ACQUISITION DEVICE © Keysight Technologies Image shown for illustrative purposes only Once the connections above are made, mains power should then be applied to the membrane hydrophone PSU and the data acquisition device.
- Page 5 ORIENTATION AND ALIGNMENT All hydrophones exhibit a directional response and the maximum hydrophone signal will be received when the plane of the hydrophone active element is orthogonal to the acoustic axis of the transducer (as shown in the image below). If the membrane hydrophone is rotated about the X or Y axes, there may be a reduction in the amplitude of received signal, even if the active element remains on the acoustic axis of the source.
- Page 6 transducer and locating signal there. Once signal is found, move gradually further away from transducer (aligning hydrophone as necessary on the way) until desired field position is achieved. Noise. Where there is poor signal to noise ratio (SNR), it can sometimes be difficult to locate ▪...
- Page 7 • Find the pressure field maximum – centred on your current position, move the hydrophone along a line parallel with the X-axis. Move the hydrophone to the location of the field maximum along that line. Repeat this type of line scan alignment in the orthogonal direction of the Y- axis.
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Page 8: Troubleshooting And Faq
Precision Acoustics for inspection. It is unlikely that the membrane can be repaired but a generous discount will be offered against a new membrane. -
Page 9: Power Supply Specification
Use of either the hydrophone or its power supply in a way not in accordance with information provided in these product instructions may be hazardous. Precision Acoustics does not accept liability for incidents occurring as a result of improper use and recommends these instructions MUST be followed. - Page 10 9 months 8 months 4 months Contact Further advice and technical assistance can be obtained from our Applications Engineers Address: Precision Acoustics Ltd, Hampton Farm Business Park, Higher Bockhampton, Dorchester, Dorset DT2 8QH Email: technical@acoustics.co.uk Tel: +44 1305 264669 Fax:...
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