Nearfield Millimetrewave Sensor Processing

In many scientific research domains and in all areas of industrial application the current trend is to develop efficient "intelligent" systems by shifting more and more effort to the digital computation level. To assure the data transmission between the processing unit and the executing mechanical modules (i.e. car braking systems), the development of new actors and sensors allowing the acquisition of very precise information is required. The mm-wave near field sensor mentioned in this paper operates at 76.5 GHz and is intended to detect distance variations with a resolution of micrometers within a range of some centimetres. Various applications of such a sensor are obvious, among the most favourables are eccentricity detection of rotating objects and derivable hereof dynamic data i.e. revolving speed. Also surface roughness control can be performed. In this paper calibration and data acquisition will be explained as well as the real time processing of the mm-wave data in time and frequency domain.