| Measurement is an important means that human beings use to know and rebuild matter world. It can collect, transform and deal with the physical quantity which wants to measure through a certain instrument or device. Measurement system is an entity system that is built to complete a measurement task. Its purpose is to show the information of the measured object to inspector rapidly, accurately and really. And it can reduce uncertainty degree while the inspector measures the measured object. Online measurement can finish measureing the needed physical quantity without influencing other system normal working during the process of machining. During the process of grinding on grinder, online measurement can be used to measure the dimension of the part, which can heighten the quality of the part, improve labor productivity and save labor time. Especially during batch production, the use of adavanced online measurement shows great meanings.With the wide use of computer technology, many complex signals in the measurement system are controlled and treated by Single Chip Microcomputer (SCM). The signal treated by SCM must be digit signal. Digit sensor can change the measured quantity into digit signal. It need not be changed and it is sent to SCM to treat directly, which can heighten measurement precision, resolving power and anti-jamming ability of the system. Digit singal is also easy to operate, store and transmit to remote place. So it is widely applied.Based on various technologies talked above, the project combines with production practice and makes foil use of online measurement, digit circuit and computer technology and develops a suit of application system which fits for online measurement on cylindrical grinder. The main reseach work and results are as follows:1. Development of online measurement and status quo of cylindrical grinder are discussed. Meanings of online measurement on cylindrical grinder are analysed. Main contents of system reseach are put forward. At the same time basic theories of measurement technology are presented. All of these lay a solid theory foundation for whole system reseach.2. Features of grating technology are analysed. Mathematics model of grating signal is presented. At the same time according to the need of system, appropriate subdivision technology is selected for system through comparing with advantages and disadvantages of all kinds of subdivision technologies. So subdicision curcuit is formed and it subdivides grating signal, which heightens system resolving powe and measurement precision.3. The design of whole measurement system is carried out. System schematic is given. Then appropriate grating sensor, amplifing circuit, shape regulating circuit, subdivision&direction identification circuit and etc. are selected. Appropriate SCM is selected. The enlarging of 8253 Counter and 8279 Display/Keyboard Chip are carried out. At the same time the design of power-dropped protection is put up.4. The basic idea of system software design is discussed. The basic function and task of system software are analysed. The general methods of data processing are brought forward. Program flow charts of main function models are listed. At the same time the design of software anti-jamming ability is carried out.5. The basic idea and principle of system mechanical clasp device fuction design is given. And design of mechanical device is carried out. The working process of mechanical device is described as well.6. Conclusions are drawn and developing trends of measurement system are prospected.
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