Volume 4 Issue 4
Aug.  2011
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WANG He-qi, MENG Fan-jiang, GUO Li-hong, GUAN Mu-qiang. High precision data acquisition of control system for high-power TEA CO2 laser based on DSP[J]. Chinese Optics, 2011, 4(4): 411-417.
Citation: WANG He-qi, MENG Fan-jiang, GUO Li-hong, GUAN Mu-qiang. High precision data acquisition of control system for high-power TEA CO2 laser based on DSP[J]. Chinese Optics, 2011, 4(4): 411-417.

High precision data acquisition of control system for high-power TEA CO2 laser based on DSP

  • Received Date: 21 May 2011
  • Rev Recd Date: 23 Jul 2011
  • Publish Date: 25 Aug 2011
  • It shows larger conversion errors and stronger electromagnetic interference when the AD converter(ADC) built in DSPF2812 of the control system for a high-power TEA CO2 laser based on the DSP is used to acquire analog signals. To overcome the backcomings, a method to correct the ADC built in the DSPF2812 was proposed based on both the hardware and software. In hardware processing, the analog filtering and isolation module were adopted to process the input analog signals and the median average filtering method was used to eliminate the occasional glitch. With software correction, two given reference voltages were sent to the two channels of the A/D converter of the DSPF2812 to calculate the offset error and gain error, then it was used to correct other channels of the A/D converter. Furthermore, the impact of the reference voltage and A/D sample clock on the A/D conversion precision was analyzed by experiments. The experimental results show that the method can improve the precision of the A/D converter effectively. The A/D conversion error has been within 3 LSB, which can ensure the stability and reliability of data acquisition for the control system in high-power TEA CO2 lasers.

     

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  • [1] Texas Instruments Incorporated. TMS320C28x系列DSP的CPU与外设[M].北京:清华大学出版社,2005. Texas Instruments Incorporated. TMS320C28x Series DSP's CPU and Peripherals[M]. Beijing:Tsinghua University Press,2005.(in Chinese) [2] 李殿军,杨贵龙. TEA CO2激光器主放电延迟时间对效率的影响[J]. 光学 精密工程 , 2006,14(5):807- 810. LI D J,YANG G L. Impact of main discharge delay time on optoelectronic conversion efficiency in TEA CO2 laser[J]. Opt.Precision Eng.,2006,14(5):807-810.(in Chinese) [3] 杨贵龙,李殿军,孟范江,等. 大功率脉冲TEA CO2激光器配气比对输出的影响[J]. 中国光学与应用光学 ,2009,2(3):231-235. YANG G L,LI D J,MENG F J,et al.. Influence of gas mixture ratios on laser outputs of high power laser pulsed TEA CO2 laser[J]. Chinese J. Opt. Appl. Opt.,2009,2(3):231- 235.(in Chinese) [4] 孟范江,郭立红,杨贵龙,等. 大功率TEA CO2激光器系统中电磁干扰的抑制[J]. 强激光与粒子束 ,2008,20(2):177-181. MENG F J,GUO L H,YANG G L,et al.. Suppression of electromagnetic interference in the Big-power TEA CO2 laser system[J]. High Power Laser and Particle Beams,2008,20(2):177-182.(in Chinese) [5] 孟范江,杨贵龙,李殿军,等. 大功率TEA CO2激光系统的电磁兼容性设计[J]. 中国光学与应用光学 ,2009,2(3):236-241. MENG F J,YANG G L,LI D J,et al.. EMC design of high power TEA CO2 laser system[J]. Chinese J. Opt. Appl. Opt.,2009,2(3):236-241.(in Chinese) [6] WANG H Q,MENG F J,GUO L H. Inhibition of electromagnetic interference in ontrol system based on DSP of high-power TEA CO2 laser . Proceedings of IEEE conference on CMCE,Changchun,China,24-26 Aug,2010:389-392. [7] 夏振华,王晓爽. 32位高性能数字信号处理器内部AD的精度校正方法[J]. 仪器仪表与分析监测 ,2010(2):20-22. XIA ZH H,WANG X SH. Researching on correcting the accuracy of 32 bit high performance DSPk's on-chip AD[J]. Instrument and Anal. Monitoring,2010(2):20-22.(in Chinese) [8] 周正,李贵山. A/D转换器参考电压的软件校正[J]. 电子元件与材料 ,2004(2):46-48. ZHOU Z,LI G SH. Research and development of high precision digital conversion module with voltage output sensor[J]. Process Automation Instrumentation,2004(2):46-48.(in Chinese) [9] 德州仪器,SCHREIBER R. 使高分辨率A /D转换器获得更高性能 .(2010-02-11). http://wenku.baidu.com/view/31a4827469eae009581becad.html. [10] 王伟,杨智涛,吴佳楠. 提高DSP的AD转换器精度的研究与实现[J]. 现代制造工程 ,2009(6):95-97. WANG W,YANG ZH T,WU J N. Enhancing the precision of DSP AD converter study and realization[J]. Modern Manufacturing Eng.,2009(6):95-97
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