No abstract

No abstract

No abstract

No abstract

No abstract

This paper describes a novel real time mechanically scanned passive millimetre wave imager. This imager produces a field of view of 40°x20° with diffraction limited performance and a 25Hz frame update rate. It is relatively inexpensive because the scene is imaged using 32 direct detection receivers with a frequency of operation from 28-33GHz. The compact antenna uses polarisation techniques to fold the beam and is constructed from readily available low cost materials.

There is a current requirement to detect and quantify the presence of gas bubbles in oil exploration. For this reason a novel method has been developed to measure simultaneously the velocity, size and refractive index of large optically transparent bubbles and droplets. The method is based on the time displacement of refracted and reflected beams scattered from the moving particles. Experimental results obtained from water droplets are included.

No abstract