光谱学与光谱分析 |
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Hadamard Transform NIR Spectrometer for the Biological Processes |
LIU Peng, LI Kai, ZENG Li-bo*, WU Qiong-shui* |
Electronic Information School, Wuhan University, Wuhan 430079, China |
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Abstract Monitoring the consumption of nutrients of biological process helps control the growth environment of the microbes. It ensures the microbes are always in the best growing conditions, so as to maximize the yield of the target product. To monitor the content of glycerol, methanol and glucose in yeast culture medium, a new NIR spectrometer was developed which is based on Hadamard Transform(HT)technique. It uses the Near IR probe, which was designed all by ourselves, to collect the spectral signals, and uses the Digital Micro-mirror Devices(DMD)to complete the coding and modulation of Hadamard template. With self-developed software, aiming at spectral acquisition and spectral processing, the spectrometer has realized the real-time monitoring. The designs of optical path, Near IR probe, hardware circuit and software modules are given. Through lots of experiments, it turns out that the value of stray light is 0.875% and the volatility is ±4.28% in this spectrometer. The spectrometer shows high precision in a series of tests which means it totally meets the requirements of monitoring the biological processes.
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Received: 2014-07-17
Accepted: 2014-11-20
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Corresponding Authors:
ZENG Li-bo, WU Qiong-shui
E-mail: lbzeng@whu.edu.cn;qswu@whu.edu.cn
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