Soft subdivision method of moire frange signal of grating
A Moiré fringe and grating technology, applied in the direction of using optical devices, measuring devices, instruments, etc., can solve the problems of residual DC level and DC level, high-order harmonics of signals, and inconsistency of two-channel signal amplitudes, so as to improve the accuracy and Resolution, simple hardware effects
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The following describes the implementation of the method of the present invention in combination with specific hardware and software:
Referring to Figure 3, the high-speed ARM processor LPC1769 (U1) is used to complete various data processing and implement subdivision algorithms. The two sine and cosine signals of A and B are respectively connected to the FA and FB terminals of the zero-crossing detector composed of the voltage comparator chip LM211D (U2). After the A and B square wave signals output by U2 pass through the direction identification circuit, they are output The signal terminal D is connected to the P1.16 pin of the ARM processor LPC1769 (U1). The square wave signal of channel A is connected to the CAP0.0 pin and EINT1 pin of LPC1769 (U1) at the same time, and is connected to the signal latch terminal Lock of the CPLD chip (U3). The two subdivided pulse signals are respectively output from the PWM1 and PWM2 ends, and PWM1 and PWM2 are respectively connected to th...
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