Frequency Modulation of vortex sensor Microcompute -

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Frequency Modulation of vortex sensor Microcomputer

Shaping the frequency of the sensor sent, so that a tilde Taiwan TTL level requirements,[link widoczny dla zalogowanych], eliminate the waveform distortion caused by solid interface circuit 5, 1 Gou Lin Jing jurisdiction: adjusting the amount of electric current sensor Microcomputer crane of 77 errors. 74LS93 is exempted into the divider to divide the frequency so that it breaks the frequency table when the CTC count requirements, and then into the CTC channel and 1 channel 0 count ( Super

,[link widoczny dla zalogowanych], through the CTC after the 2-channel timer , the data is read into memory, processed by software, CTC channel 0 and 1 tandem channel count is asked to extend the sampling to improve the precision. Direct the operation of the above circuit will produce high false readings, that the high byte of data and data between the low byte binary. Then the readings will produce false readings. Because when reading data into the low byte reading is correct, when reading data into the high byte. As low byte of data has generated binary, so the high byte of the data increased by 1, which created a great reading error. To overcome this false reading is: before reading the data, first turn off the pulse count rate, that is, 74LS93 divider into the first and second legs of the potential to become high, and then read the data, This prevents the wrong readings. Also to obtain accurate data, the software program in the preparation of CTC interrupt service routine is very important. 122 data processing to the measured data into the computer a list of EPROM, the calculation method using look-up table to read the data. Curve from Figure 4 can be seen, the FM frequency eddy current sensors - displacement characteristic of the non-linear particularly serious, if the nonlinear correction from the hardware manual, not only the circuit structure is complex, debugging difficult and costly, unstable factors increase, the amendment also limited the scope,[link widoczny dla zalogowanych], it is difficult to achieve high accuracy, non-linear correction with computer software, able to overcome the difficulties of reaching a larger range and higher correction accuracy. The system uses nonlinear piecewise interpolation l2 correction, and were accompanied by high-precision floating-point operations, so to obtain better results. 2 Summary of use of FM-type eddy current displacement measuring system than use of amplitude modulation of the eddy current displacement measuring system, its advantage is simple structure, strong anti-interference ability,[link widoczny dla zalogowanych], stable performance,[link widoczny dla zalogowanych], resolution and accuracy. In addition the frequency output to facilitate data collection and processing costs are greatly reduced, the output characteristics of the non-linear computer and appropriate software can be corrected, it will also help expand the range and improve the precision. Therefore, FM-style output and the computer processing is an eddy current measurement system ideal and practical solution. It should be stated in order to further improve the precision, the key is to try to improve the sensor coil inductance and oscillator quality, and enhance its stability.

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