Moire Fringe Interpolation Coefficient Quick Subdivision

With the developments of technology, especially in fields of space, automatization and national defence, the demands of the targets to the photoelectric rotary encoders are higher and higher . The targets are the high-resolution , high-accuracy, the high-frequency and good real time . So the fast interpolation set of the Moire stripe signal is the problem that is anxious to be resolved .A kind of electrical fast interpolation device, which is applied on the high-resolution, high-accuracy and photoelectric rotary encoders, is introduced in this paper. Combined software interpolation by 16 bits MCS-96 series single-chip computer 80C196KC with hardware interpolation through frequency-multiplied circuit .this device is developed on the base of frequency-multiplied theory and method of calculation interpolation. Five main advantages are described as follows : 1. Frequency-multiplied circuit improved the quality of original iMoire fringe signal , and the interpolation accuracy .2.The set adapts the high speed 12 bits A/D .It has four-channel track/hold circuits . So the parts of the apparatus are reduced and the system stability is improved .3. The single-chip computer 80C196KC has the demand of 32 bits division .At the same time , we adopt the way of straight investigation table . The data processing time is less 50Hs . It is the 1/6 of the MCS-51 series single-chip .4.Redoubled, frequency-multiplied signal is interpolated to 8192 parts by single-chip computer . This acquires high interpolation times , and the resolution and accuracy of absolute photoelectric rotary encoders are improved as well.5. The working temperature is extended industrial temperature range(-40癈~+85癈) . So it is applicable in badly outdoors condition .So this device can implement the high-accuracy test of angel position and real-time control when it is used the data processing system of absolute photoelectric rotary encoders .Then the requirements for high-accuracy , high-resolution absolute photoelectric rotary encoders of such fields as space science , automation ,and national defense construction etc. can be met.