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一、光栅信号直线位移光栅数显系统的光栅传感器采用四裂相指示光栅,光栅副形成光闸莫尔条纹,光电元件将移动的这种条纹转换成四路相位依次差90°的正弦光栅信号,分两种方式输出。一种称为串接法,0°与180°两路正弦光栅信号串接,90°与270°两路正弦光栅信号串接,获得两路相位差90°的正弦信号,经整形后,输出两路相位差90°的方波。另一种称为直接法,光栅信号经射随器直接输出。对于20细分的数显系统,数显表接收的就是这种直接输出的正弦光栅信号,经差分运放处理,变为两路相位差90°的正弦信号。由于基准电压V_(ref)(2.5V)的加入,所以这两路信号成为正弦形的正的信号且以2.5V 为对称中心。根据数显功能的要求,对光栅信号进行各种处理和传递。
First, the raster signal linear displacement grating digital display grating sensor using four split phase grating, the raster to form a shutter Moore fringes, optoelectronic components will move this streak into four phases followed by a phase difference of 90 ° of the grating signal , In two ways output. One is called the tandem method. The two 0 ° and 180 ° sinusoidal signals are connected in series, and the two sinusoidal signals of 90 ° and 270 ° are connected in series to obtain two sinusoidal signals whose phase difference is 90 °. After shaping, the output Square two phase difference of 90 ° square wave. Another known as the direct method, the grating signal is directly output by the emitter. For the 20 subdivision digital display system, digital display is receiving this direct output of the sinusoidal grating signal, the differential op amp processing, into two phase difference of 90 ° sinusoidal signal. Due to the reference voltage V ref (2.5V), the two signals become sinusoidal positive signals and are centered at 2.5V. According to the requirements of digital display function, the grating signal for a variety of processing and delivery.