| Surface metrology is an important field of geometry metrology. Surface roughness measuring technology has most widely applied foreground. It is important to impulse the whole level and modernization of machining in China.Ever-improving process quality of surfaces demands high precision and velocity of surface roughness measurement. In recent years, the new standard of surface roughness measurement has been re-edited with the change of international standard. Therefore, many aged instruments can't conform to the new standard. Being produced many years ago, they can't be used normally because of their aged electronic measurement system, but their mechanical parts can be still used. Stopping using them is very improvident. So, it is necessary to repair these instruments by improving the electronic measurement system and upgrading the software.Based on the shortage of Surface Roughness Measuring Instrument Type Talysurf-5, the subject is a rebuilt system that based on reserved mechanical parts. The new system processes the sensor signal and inputs it to the computer, then gets roughness signal by the digital filter. This system can calculate the roughness parameters and draw the charts. The thesis mostly relates to the software processing. The software processing includes data processing and file processing. In the data processing module, it discusses roughness parameters, mean line, algorithm of digital filter design and overall merit by picketage algorithm and error analysis. In the file processing module, it includes file opening, saving, printing and drawing processing. The thesis simply introduces the hardware part.According to the experimental check, the new surface roughness measuring system reaches expected result. The system improves the measuring speed and the measuring range, operates simply, moreover implements antomation and intelligence. It reaches the national standard and has been used in the factory. The new system operates well at the present time.
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