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| The Multi-Beam Interference Suppression for Measuring Penicillin Vial’s Oxygen Concentration Based on Tunable Diode Laser Absorption Spectroscopy |
| ZHU Gao-feng1, 2, HU Xin1, ZHU Hong-qiu1*, HU En-ze1, ZHU Jian-ping3 |
1. School of Information Science and Engineering, Central South University, Changsha 410083, China
2. School of Information, Hunan University of Humanities, Science and Technology, Loudi 417000, China
3. Truking Technology Limited, Changsha 410600, China |
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Abstract Penicillin vial’s oxygen concentration detection based on tunable diode laser absorption spectroscopy (TDLAS) was conducted in the open, on a single and short optical path. In this system, the multiple reflections and transmissions were caused by parallel glass walls, and the multi-beam interference impacted the signal wave form and the accuracy of the detection. A method was created tochange the incident angle of laser, and the influence of incident angle was the oretically analyzed to the distribution of transmission intensity. The calculation formula of incident angle was deductedin order that the superposition part of two coherent beamslocated in the outside of the detection range, and then the theoretical optimal incident angle was determined according to the field parameters. The 2f signal of sample(concentration 1%) was severally measured for many times in different time, and the signal to noise ratio (SNR) could be use as the optimization index of optimal angle. Finally, the actual optimal incident angle acquired in this system was determined. To compare with the optimal incident angle and the incident angle of high coefficient of determination, the concentration prediction result of cross validation showed that the correlation coefficients were 0.995 9 and 0.988 9 respectively. The former was 0.7% larger than the latter, and the root mean square errors of prediction (RMSEP) were 0.003 1 and 0.005 3 respectively. In addition, the former was reduced by 41.5% than the latter. This validates the effectiveness of the proposed method which can suppress the Multi-beam Interference and further improve the accuracy.
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Received: 2017-03-22
Accepted: 2017-08-18
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Corresponding Authors:
ZHU Hong-qiu
E-mail: hqcsu@csu.edu.cn
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