Dr Mathew Legg BSc, MSc, PGDipSci, PhD

Mathew's research relates to development of acoustics/ultrasonics tools and techniques. Prior to his current position at Massey, he was a postdoctoral research fellow at the University of Auckland where he worked on MBIE projects relating to the development of acoustics/ultrasonics instruments and techniques for measuring pasture biomass and the structural properties of trees. Before this he was a research fellow at Brunel Innovation Centre in Cambridge, UK where he performed research on the use of ultrasonic guided waves for nondestructive testing on several European Union projects. His PhD work related to the 3D acoustic imaging using microphone arrays (acoustic cameras).

New Zealand MBIE and European Union Projects worked on as Postdoc:

• "Precision Acoustic Sensors for Pastoral and Arable Farming" (Oct 2015 – Sep. 2018), University of Auckland. Ministry of Business, Innovation and Employment (MBIE) project. Development of a smart ultrasonic sensor to measure pasture dry matter or crop growth.

• "Acoustic Non-destructive Evaluation of Wood Properties in Standing Trees and Felled Stems" (May 2014 – Apr. 2016), University of Auckland. Subcontracted to UniServices by SCION from Ministry of Business, Innovation and Employment (MBIE). Developed novel acoustic/ultrasonic tools for measuring the internal stiffness of trees. Part of the Growing Confidence in Forestry Future project (http://gcff.nz/)

• "CleanShip – Prevention and Detection of Fouling on Ship Hulls" (2013–2014) Brunel University. Collaborative European Union 7th Framework Program project. Development of a guided wave ultrasonic antifouling system for ships.(http://cleanship-project.eu/)

• "Chaplin: High Power Transmission Line Cable Inspection" (2013–2014) Brunel University. Collaborative European Union 7th Framework Program project. Development of ultrasound guided wave inspection system hardware and signal processing software for defect detection on high voltage power lines. (http://www.chaplin-project.eu/1.html)

• Safewire: Long Range Ultrasonic Inspection of Aircraft Wiring (2013–2014) Brunel University. Collaborative European Union 7th Framework Program project. Development of ultrasonic guided wave system for detection of defects in the insulation of aircraft wires. (http://safewire.eu)

PhD Research:

• "Microphone Phased Array 3D Beamforming and Deconvolution" (2008-2012) University of Auckland. Supervisor: Prof. Stuart Bradley. Research related to development of image sharpening (deconvolution) of 3D acoustic maps generated using microphone arrays (acoustic cameras), beamforming algorithms, and computer vision techniques.

MSc Research:

• "Multi-frequency Clutter-rejection Algorithms for Acoustic Radars" (2006-2007) University of Auckland. Supervisor: Prof. Stuart Bradley. Acoustic radar development for measuring wind profiles and rain drop size distribution.