See below a number of tutorials that have been created to aid you in your research. For more information, please get in touch at the bottom of the page.
Hydrophone Sensitivity and Frequency Response
Introduction for hydrophone users on the basics of hydrophone sensitivity and frequency response. Sample response for some of the different types of hydrophone is presented. The relevance of hydrophone frequency response, in the context of the type of field being measured, is also discussed.
Converting Hydrophone Output Voltage To Pressure
Introduction to the method to convert hydrophone output voltage to a pressure waveform. The general concept of deconvolution is presented as well as the narrowband approximation and when it may be used.
Oscilloscope Impedance and Ultrasonic Measurements
An introduction for hydrophone users on the importance of selecting the correct oscilloscope impedance when making ultrasonic measurements.
Hydrophone Directivity and Spatial Averaging
Introduction to hydrophone directivity and spatial averaging. The causes of both effects are discussed and the means by which directional response is determined experimentally are presented.
Ultrasonic Power Measurement
An overview of ultrasonic power measurement including the use and limitations of both Radiation Force Balances, and Scanned hydrophone measurements.
Oscilloscope Setup For Hydrophone Measurement
A brief tutorial on the fundamentals of oscilloscope setup when conducting hydrophone measurements.
Uncertainty In Ultrasonic Measurement
A very brief introduction to the topic of measurement uncertainty and how it applies in ultrasonic measurements.
Ultrasonic Transducers – Construction, Bandwidth and Damping
One of a 3-part mini-series on ultrasonic transducers, discussing the basics of transducer construction and how this can impact damping and thus bandwidth.
Ultrasonic Transducers – Choosing An Excitation Signal
One of a 3-part mini-series on ultrasonic transducers, demonstrating how the choice of excitation signal can impact both the ultrasonic signal generated by the transducers and the ease of making subsequent measurements.
Ultrasonic Transducers – Radiated Field Patterns
One of a 3-part mini-series on ultrasonic transducers. This tutorial video extends upon the previous discussion of excitation signals and illustrates how radiated field patterns due to the interaction of edge and plate wave contributions.
An Introduction To Fibre-Optic Hydrophones
This tutorial provides an introduction to fibre-optic hydrophones and their methods of operation. It also discusses some features that set this class of hydrophones apart from conventional piezo-electric ones.
Addressing The Challenges Of Hydrophone Measurements In Nonlinear Ultrasonic Fields
Presentation given at the Acoustical Society of America’s “Acoustics Virtually Everywhere” conference in December 2020. This paper discusses the challenges associated with making hydrophone measurements in nonlinear fields
Introduction To Fourier Transforms And Their Application
Topics covered are: how sinusoids combine to represent time domain waveforms, why do we use window functions, what are convolutions, and how is it useful with real-world systems. Contains a number of animations to help illustrate important concepts.
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