| 高精度数据采集系统在近红外光谱测量仪中的应用 |
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| 引用本文： | 丁佳,张树群,黄泳,黄常钊,黄耿江. 高精度数据采集系统在近红外光谱测量仪中的应用[J]. 光学仪器, 2009, 31(1): 35-39 |
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| 作者姓名： | 丁佳 张树群 黄泳 黄常钊 黄耿江 |
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| 作者单位： | 暨南大学,光电工程系,"重大工程灾害与控制"教育部重点实验室,广东,广州,510632;暨南大学,光电工程系,"重大工程灾害与控制"教育部重点实验室,广东,广州,510632;暨南大学,光电工程系,"重大工程灾害与控制"教育部重点实验室,广东,广州,510632;暨南大学,光电工程系,"重大工程灾害与控制"教育部重点实验室,广东,广州,510632;暨南大学,光电工程系,"重大工程灾害与控制"教育部重点实验室,广东,广州,510632 |
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| 摘 要： | 为了满足近红外测量对近红外光谱仪高精度的要求，采用AD公司的低噪声放大器ADA4841—1以及24位A／D芯片AD7767，设计了包括运算放大电路，A／D转换电路在内的数据采集系统。实现了对微弱信号的放大和A／D转换。用软件对采集的数字信号进行中值滤波后，将数据送到PC机进行算法分析。多次测试的结果表明，在采样速率为1kHz／s时，数据精度可达到13bit，满足了滤光片透射式近红外光谱仪的要求。
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| 关 键 词： | 微弱信号放大 近红外光谱仪 高精度数据采集 中值滤波 |
The application of high precision digital acquisition system in near infrared spectrometer |
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| DING Ji,ZHANG Shuqun,HUANG Yong,HUANG Changzhao,HUANG Gengjiang. The application of high precision digital acquisition system in near infrared spectrometer[J]. Optical Instruments, 2009, 31(1): 35-39 |
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| Authors: | DING Ji ZHANG Shuqun HUANG Yong HUANG Changzhao HUANG Gengjiang |
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| Affiliation: | (Key Laboratory of Disaster Forecast and Control in Engineering, Ministry of Education, Department of Optoelectronic Engineering, Jinan University, Guangzhou 510632, China) |
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| Abstract: | In order to meet the need of spectrometer in near infrared(NIR)measure field,we introduced a low noise amplifier chipset ADA4841-1 and a high performance 24-bit chipset AD7767 which is over sampled successive approximation(SAR)analog-to-digital converters(ADCs).According to the characteristics of signals of Near Infrared(NIR),we designed a digital acquisition system including amplifier and ADCs.This system can amplify the weak signals and convert the analog signals to digital ones.After median filtering,digital signals are sent to computer for further processing.The experimental results show that when the conversion rate is 1kHz/s,the measured precision is up to 13bit.This system can meet the require of the filter-transmittance-type NIRS. |
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| Keywords: | weak signal amplify near infrared spectrometer(NIRS) high precision digital acquisition system median filtering |
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