48级灰度线性声光调制驱动源研究

设计了一种衍射光强灰度值随数字调制电压成线性变化的48级灰度线性声光调制驱动源。该设计通过数字控制电路把0~5V (D.C.) 分为48档次的数字调制电压，进而对晶体振荡电路产生的高频载波信号进行幅度调制，使声光调制驱动源输出相应的射频驱动信号并驱动声光器件。通过声光调制实验得到对应的衍射光强灰度值并显示相应的灰度等级，针对声光器件固有的非线性特性，通过线性电压补偿技术得到补偿后的衍射光强灰度值与数字调制电压的线性相关系数为97.73%，比补偿前提高了7.06%。

Research on 48 Gray Linear Scale Acousto-optic Modulation Driving Source

A 48 gray linear scale acousto-optic?modulation driving source is designed to achive the feature that diffraction light intensity gray value presents a linear corresponding change with the digital modulation voltage. The design divides 0~5V(D.C.) into 48 grades in digital modulation voltage by digital control circuit. Then it is used to modulate the amplitude of the carrier signal which is generated by crystal oscillator circuit. So the acousto-optic modulation (AOM) driving source outputs the corresponding radio frequency driving?signal and drives the acousto-optic devices. Through acousto-optic modulation experiments obtain the corresponding diffraction intensity gray value and display corresponding gray level. Due to the inherent nonlinear characteristic of acousto-optic devices,using linear voltage compensation technique obtains the linear correlation coefficient of diffraction intensity gray value vs. digital modulation voltage is 97.73%, increased by 7.06% than uncompensated.