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Winter 2013 Newsletter www.ndabetterway.org.uk Acoustic Probe, Furness College Ken Seddon Our aim is to design an acoustically driven probe which will agitate the surrounding loose ground and penetrate to the required depth or until contact with an object is made. The probe will then excite the object with pulses or chirp and analyse the returned signatures. A probe was designed conceptually using a system design approach. The initial design was based on the hand held probe used by MAG International. Functional modelling identied the most important unctions o the concept designs to be considered or the prototype as acoustic signature detection. Work in recent months includes the adaption o our manual rig to allow an output in labview. The rig, which includes a orce sensor, has been stripped and reassembled and a visual indicator has been placed on the manual control box. This is so an accurate orce sensing can be displayed. The next step is to develop multiple orce settings. We have purchased a Piezo sensor with an output o 1Khz. When tested, diferent objects had diferent signatures and these signatures remained the same when the objects were buried. Diferences between hollow and solid objects were also clear. This means that lters should be able to be used to identiy objects – this is the next step. I this works, the output can be amplied and displayed. Research is also being carried-out to nd a reliable method o characterising items that are commonly ound in the ground along with landmines. Piezoelectric crystals are being used as a means o distinguishing between mines and clutter. By distinguishing between the diferent resonance efects and requency response o items, the aim is to reduce the number o alse signals that occur in the detection process. Our research team is also looking at how best to insert the probe into the ground with a orce that is no greater than 5Kg at the point when it hits an object. They are also testing to see whether it is better to drill rst then change the drill bit or a probe or to have a multi-use probe. Ultrasound Project, University of Manchester Professor Bill Lionheart We have shited our attention rom ultrasound to the mathematically similar ground penetrating radar problem. GPR is already deployed as a supplementary technique to metal detection, but without orming an image o the underground structure. Once a metal object has been detected in some cases GPR will conrm that it is not surrounded by a mine, so that part o the ground can be cleared more quickly. We are continuing to rene our imaging algorithm, and are veriying under what circumstances it will yield positive results as we work towards imaging real data in our collaboration with the SEMIS group at Manchester developing hardware. Find A Better Way joined with the EPSRC unded “Building Global Engagements” grant Manchester Image Reconstruction and Analysis, to hold a workshop on improving imaging algorithms or mine detection. A major breakthrough in this area has occurred prompted by this workshop and inspired and encouraged by FABW, with recent papers by Habib Ammari rom Paris and his collaborators and by Paul Ledger (rom Swansea) and Bill Lionheart. This means that the characteristic response o a metal object can be calculated rom its shape, essentially as six numbers, and the hope is this can be used in sotware to classiy objects as well as locate them. SEMIS Project, University of Manchester Professor Tony Peyton Progress has continued on the SEMIS (Scanning Electromagnetic Mine Inspection System) project, which aims to help tackle the problem o metallic clutter during de-mining operations. Standard metal detectors, which are widely used in humanitarian mine clearance operations can produce many alse positive signals rom innocuous metal ragments in the ground, which must also be painstakingly excavated, slowing down operations. Developments over the past decade in combining metal detectors with ground penetrating radar (GPR) has ofered much promise in reducing this problem. SEMIS is aiming to urther this approach and our intention is to provide the de-mining personnel with all the best available electromagnetic inormation to assist their decision making and provide de-mining technology optimised or humanitarian operations. The research integrates metal characterisation, GPR and position sensing o the detector head above the ground. The metal characterisation is an advance on conventional metal detection and involves a new technique, tensor spectroscopy, which is being pioneered by the SEMIS team with help rom colleagues in the School o Mathematics. We have recently tested experimental coil geometries and multi-requency electronics and are in the process o designing and building a portable version or urther experiments. A team o eight students rom ourth year MEng course in the School o Electrical Engineering and Electronics has just joined the SEMIS team to test and implement a position measuring system or the sensor head. University reports...
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