摘要
海水中的浮游植物是海洋生态系统中最主要的初级生产者和能量的主
要转换者,海藻是主要的海洋浮游植物,对海洋中海藻种类进行识别,可
以估测海区内生态系统的群落结构和能量分布状态,实现海洋污染的监测
和治理。
本文在对荧光测量机理和人工神经网络理论进行分析的基础上,提出
了将荧光法与 BP网络相结合的单一海藻定性识别方法,并应用该方法进行
三种不同门类海藻的识别和检测,设计了光纤荧光海藻自动识别系统的总
体方案。主要研究内容如下:
(1) 从荧光测量的基本原理出发,研究了海藻荧光检测机理,论证了
采用荧光法实现海藻监测的可行性,为不同门类海藻的在线监测识别奠定
了理论基础。
(2) 研究了不同门类、不同浓度海藻溶液及其所含特征色素的吸收光
谱、激发光谱、荧光光谱特性,提取了海藻种类识别的特征参量,并确定
了最佳激发波长和荧光检测波长,为光纤荧光测量系统的设计提供了实验
依据。
(3) 设计了光纤荧光海藻自动识别系统的总体方案。包括消除光源不
稳定性影响的双光路双通道测量技术;高效收集荧光,避免杂散光的光纤
探头;实现背景噪声中微弱荧光信号提取的低噪声前置放大、时域平均检
测技术。
(4) 基于海藻的荧光光谱特性,设计了用于单一海藻识别的 BP 网络模
型,并将其应用于三种不同门类单一海藻的识别实验,验证了将荧光法和
人工神经网络理论相结合应用于海藻识别的可行性。
本研究将荧光法和人工神经网络模式识别理论相结合应用于光纤海藻
自动识别系统,能对三种不同门类的海藻进行自动识别,并具有数据实时
采集、处理及结果显示等功能,为海藻状态监测提供了一种新的技术手段。
Phytoplankton in the sea is the main primary producer and energy
transducer in ocean ecological system. By the recognition of algae that is the
main ocean phytoplankton, we can estimate community structure and energy
distribution in the sea area and realize monitoring and governing ocean
pollution.
Based on the analysis and synthesis of principle of fluorescence
measurement and theory of artificial neural network, this paper proposes a
method that the single algae could be recognized based on fluorescence
method and BP network, applies it to recognition of three kinds of single algae,
and designs systematic scheme which is so called optical fiber and
fluorescence system for automatic algae recognition. The main research
contents are as followings:
(1) Based on the fundamental theory of fluorescence measurement, the
principle of the algae fluorescence detection is studied and the feasibility of
fluorescence method is demonstrated in order to provide foundation for the
reasonable online recognition of different kind of algae.
(2) Not only are the absorption spectra, excitation spectra and fluorescence
emission spectra properties are analyzed by the experiments, but also the
characteristic parameters are picked-up for algae recognition and best
excitation wavelength and fluorescence detection wavelength are selected.
(3) The total scheme of optical fiber and fluorescence system for automatic
algae recognition are based on PC. This system includes the double-channels
measurement technology for weakening the influence of instability
lamp-house, the probe for effective collecting fluorescence without scattered
light, low noise preamplifier average detection technique in time field to pick
up the weak fluorescence from the measured signals with noise.
(4) Based on fluorescence spectra of algae, BP network model for
recognition of three kinds of algaes is designed, recognition experiment of
three kinds of single algae has been carried with BP network, which
demonstrates the feasibility fluorescence method and artificial neural network
II
pattern recognition theory algae recognition.
This research applies fluorescence method and artificial neural network
pattern recognition theory to optical fiber algae monitor system that can
realize recognition of three kinds of algaes. This system has real time data
collection, data processing and results displaying functions. A novel technical
means for algae state monitoring is provides by the paper.
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