Sinusoidal Amplitude Modulation and Coherent Demodulation Technique for Chlorophyll Fluorescence Measurement

被引:0
|
作者
Li, Gang [1 ]
Zhang, Juan [2 ]
Chang, Sheng [1 ]
机构
[1] China Univ Geosci, Sch Mech Engn & Elect Informat, Wuhan 430074, Peoples R China
[2] Hubei Univ Chinese Med, Sch Management, Wuhan 430065, Peoples R China
来源
PROCEEDINGS OF THE 2015 JOINT INTERNATIONAL MECHANICAL, ELECTRONIC AND INFORMATION TECHNOLOGY CONFERENCE (JIMET 2015) | 2015年 / 10卷
关键词
chlorophyll fluorescence; sinusoidal amplitude modulation; coherent demodulation; signal to noise ratio; measurement error; A FLUORESCENCE; FLUOROMETER; TRANSIENTS;
D O I
暂无
中图分类号
TP [自动化技术、计算机技术];
学科分类号
0812 ;
摘要
As a quick and non-intrusive probe of photosynthesis, the chlorophyll fluorescence has been widely studied. Extracting the weak fluorescence signal from the strong noise is necessary to the chlorophyll fluorescence measurement and analysis. In this paper, the time-domain and frequency-domain characteristics of the chlorophyll fluorescence signal and noise caused by the actinic light and the saturation pulse light were analyzed, and a new fluorescence measurement technique, sinusoidal amplitude modulating and coherent demodulating the fluorescence signal, was presented. Using the new technique, the measurement light was modulated by a 1KHz sinusoid, the modulated noisy fluorescence was demodulated using the coherent method with several different cut off frequencies, and signal to noise ratios and measurement errors were calculated and analyzed. The results indicated that the new measurement technique can be employed to measure accurately and efficiently the chlorophyll fluorescence in situ.
引用
收藏
页码:786 / 789
页数:4
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