Computer control automatic measurement of SMMW wavelength and field distribution pattern
A computer controlled automatic measurement system of SMMW wavelength and field distribution pattern is constructed. The system consists of a F-P interferometer and a mirror-rotating apparatus driven by step-motors. The measurements can be done automatical ly and accurate1 y. INTRODUCTION A F-P interferometer (FPI) and a detector x-y scanning system are useful instruments for the measurement of SMMW wavelength and space distribution of EM wave. But it is tedious for one to operate the instruments tracing the field strength point by point manually. A microcomputer was used to control step-motors system of a field distribution measuring instrument.The measurement can be done automatically and accurately, the results can be depicted by the computer. driving the scanning system of a FPI or a berm sweeping WAVELENGTH MEASUREMENT A SMMW FPI (1,219 which consisting of a pair of s t r i c t l y parallel metal I ic meshes and a translational scanning system, is available for wave1 ength measurement. A computer control step-motor drives one of the meshes scanning smoothly through a distance (Fig.1). After each step of the scanning, sampling of the FPI output will be made, the sampling values are stored into the computer through A/D interface for calculation. Once the step-scanning completed, a response curve of the measuring interference displays on the screent in the mean while, calculation is carrying out, the dI-iMW beam FPI De tec to r Fig. 1 Construction of FPI measurement part.