Acoustic CT System for Temperature Distribution and Wind Velocity Vector Measurement
In this report, a measurement method for cross-sectional temperature and wind velocity distribution is discussed. A novel method based on an acoustic CT technique is proposed. Specifically, the temperature and the wind velocity distributions are estimated simultaneously using the time of flight data of several ultrasonic propagation paths. The temperature and the wind velocity effects can be distinguished by considering sum and difference of the time of flight (TOF) data. Two types of projection data, temperature-oriented data and wind-velocity-oriented data, components are obtained. A filtered back projection method and inverse matrix method are applied to reconstruct the temperature and the wind velocity distributions, respectively. An experimental system is designed and fabricated to realize simultaneous temperature and wind velocity distribution measurements. Through this system, the effectiveness of the proposed measurement method is confirmed.
Ultrasonic tomographic imaging of solid objects in air using an array of fan-shaped-beam electrostatic transducers
A technique capable of imaging solid object distributions in air is presented. The imaging technique is based on a tomographic method, similar in concept to those used in diagnostic computerised tomography. The reconstruction algorithm has been implemented in a software modelling package to allow the performance of the technique to be evaluated for various object distributions and array configurations. Furthermore, fan-shaped-beam (FSB) electrostatic transducers have been developed to allow experimental evaluation of the technique. Experimental and simulated results indicate the utility of the approach to provide information on the size, shape, location and orientation of solid objects.
Sensory Systems for Robot Control
A symposium on this subject was held at the New Connaught Rooms in London on 21 October 1992. Twelve papers were presented and about 30 delegates attended. All but one of the papers came from a university: Brunei, East London, Ghent in Belgium, Greenwich, Nottingham, Salford, Sheffield and Surrey. The exception was a paper from Advanced Robotics Research Ltd. It was significant, and widely commented on, that the papers were virtually all from academic institutions while the delegates were all from industry. Methods and systems described in the papers were in various stages of development; none was commercially available or in industrial use. In fact, in many cases the objective behind presenting a paper at this symposium was to canvass industrial sponsorship to enable the project to continue or to bring it to market.