基于DSP的高功率TEACO<sub>2</sub>激光器控制 系统的高精度数据采集

王鹤淇; 孟范江; 郭立红; 管目强

Volume 4 Issue 4

Aug. 2011

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Article Contents

Chinese Optics > 2011 > 4(4): 411-417.

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.

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.

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

1.
Changchun Institute of Optics,Fine Mechanics and Physics, Chinese Academy of Sciences,Changchun 130033,China;
2.
Graduate University of Chinese Academy of Sciences,Beijing 100039,China

Received Date: 21 May 2011
Rev Recd Date: 23 Jul 2011
Publish Date: 25 Aug 2011

Abstract

Abstract

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.
- high-power TEA CO2 laser,
- data acquisition,
- DSP F2812,
- A/D conversion,
- error correction

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References(1)

References

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