脉冲调光与方波调光方法噪声模型的建立与分析

陈竞韬, 段发阶, 蒋佳佳, 等. 脉冲调光与方波调光方法噪声模型的建立与分析[J]. 光电工程, 2019, 46(2): 180338. doi: 10.12086/oee.2019.180338
引用本文: 陈竞韬, 段发阶, 蒋佳佳, 等. 脉冲调光与方波调光方法噪声模型的建立与分析[J]. 光电工程, 2019, 46(2): 180338. doi: 10.12086/oee.2019.180338
Chen Jingtao, Duan Fajie, Jiang Jiajia, et al. The establishment and analysis of noise model for pulse modulation dimming method and square-wave modulation dimming method[J]. Opto-Electronic Engineering, 2019, 46(2): 180338. doi: 10.12086/oee.2019.180338
Citation: Chen Jingtao, Duan Fajie, Jiang Jiajia, et al. The establishment and analysis of noise model for pulse modulation dimming method and square-wave modulation dimming method[J]. Opto-Electronic Engineering, 2019, 46(2): 180338. doi: 10.12086/oee.2019.180338

脉冲调光与方波调光方法噪声模型的建立与分析

  • 基金项目:
    国家重点研发计划资助项目(2017YFF0204800);国家863计划资助项目(2013AA102402);国家自然科学基金资助项目(61501319);天津市自然科学基金资助项目(17JCQNJC01100);光电信息与仪器北京市工程研究中心开放课题资助项目(GD2015007);海洋经济创新发展区域示范项目资助项目(cxsf2014-2);教育部博士基金资助项目(20130032110054);微光机电系统技术教育部重点实验室(天津大学)开放基金资助项目(MOMST2015-7)
详细信息
    作者简介:
    通讯作者: 段发阶(1968-),男,博士,教授,博士生导师,主要从事测试计量技术及仪器、激光及光电测试技术、计算机视觉检测技术、光纤传感技术、自动控制技术等方面研究。E-mail: fjduan@tju.edu.cn
  • 中图分类号: O436.3

The establishment and analysis of noise model for pulse modulation dimming method and square-wave modulation dimming method

  • Fund Project: Supported by the National Key Research and Development Program (2017YFF0204800), National High-tech R & D Program of China (863 Program) (2013AA102402), National Natural Science Foundation of China (61501319), Tianjin Natural Science Foundation (17JCQNJC01100), Photoelectric Information and Instruments Beijing Engineering Research Center Open Project (GD2015007), Regional Demonstration Project for Innovative Development of Marine economy(cxsf2014-2), the Doctoral Program Fund of the Ministry of Education (20130032110054), and Microlight Electromechanical System Technology Ministry of Education Key Laboratory Open Fund (MOMST2015-7)
More Information
  • 在利用紫外荧光法对油含量小于10 mg/L的油田回注水进行检测时,光源热功率过大会降低测量结果的精度。为减小光源热功率,提出了光源的脉冲调光方法(占空比小于50%),替代原有的方波调光方法(占空比为50%)。分别建立了基于脉冲调光方法与方波调光方法的噪声分析模型,比较了两种方法的测量结果信噪比(SNR),并推导了测量结果信噪比与光源功率的关系,在信噪比相同的情况下, 可以得出脉冲调光方法的电流幅值与占空比的最优选择方案。结果表明,当测量结果信噪比相同时,脉冲调光方法光源功率不足方波调光方法的21%。最后通过MATLAB软件对两种调光方法的信号解调过程进行仿真,比较了两种方法的测量结果信噪比,仿真所得信噪比关系与理论推导结果一致。

  • Overview: When using crude oil for producing qualified oil and gas production, we need to separate the water from the crude oil which is called oil sewage. The oil sewage contains a certain amount of oil and other impurities. The oil sewage is usually reinjected back under the ground after multiple processes. To avoid the excess oil of reinjection water affecting the quality of underground water source, it is important to ensure that the oil concentration is lower than requirement. Oil concentration measurement methods include infrared spectrophotometry, nephelometry, ultraviolet spectrophotometry and ultraviolet fluorescence. The ultraviolet fluorescence method has the advantages of real-time and high precision. The oil concentration of purified reinjection water is usually lower than 10 mg/L, so the ultraviolet fluorescence method is more suitable in this situation. To accurately measure the concentration of reinjection water based on ultraviolet fluorescence method, high transmission power of light emitting diode (LED) is required, so that the fluorescence of aromatics in oil is sufficient to be detected. In early experiments, the oil concentration is measured by square-wave dimming method (duty ratio equal to 50%). The chip temperature of LED will be higher than requirement because of the high transmission power of LED, thereby, LED luminous efficiency will be drastically reduced, and LED devices will be even damaged. To solve this problem, this paper proposed the pulse modulation dimmer method (duty ratio less than 50%) to reduce the LED average power and increase instantaneous power, which could ensure high signal-to-noise ratio (SNR). Pulse modulation dimming method makes LED produce higher transient light intensity and shortens the amount of conduction time in unit time. Two noise analysis models for pulse modulation and square-wave modulation dimming method were built. The discussion focused on wideband limiting in square-wave dimming method and the influence of noise aliasing in pulse modulation dimmer method. Signal-to-noise ratio of measurement results for two methods were compared under several condition. The relationship among SNR, light source power and duty ratio was derived. The optimum choices of current amplitude and duty ratio for pulse modulation dimming method were proposed under the condition of the same signal-to-noise ratio. Results show that the light source power for pulse modulation dimming method is less than 21% of that for square-wave modulation dimming method under the condition of the same signal-to-noise ratio. Finally, signal demodulation models of two dimming methods were simulated by MATLAB software. The simulated relationship of SNR for two methods is consistent with the theoretical analysis results.

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  • 图 1  测量系统结构原理

    Figure 1.  Principle of measurement system structure

    图 2  方波解调示意图

    Figure 2.  Diagram of square-wave signal demodulation

    图 3  脉冲解调示意图

    Figure 3.  Diagram of pulse signal demodulation

    图 4  数字解调算法示意图

    Figure 4.  Diagram of digital demodulation algorithm

    图 5  αw2的取值范围

    Figure 5.  Value range of α and w2

    图 6  滤波后的脉冲波形

    Figure 6.  Waveform of pulse after filter

    图 7  光电二极管输出信号与电路解调后信号

    Figure 7.  Photodiode output signal and signal after demodulation

    图 8  光电二极管输出信号与数字解调后的序列

    Figure 8.  Photodiode output signal and sequences after digital demodulation

    表 1  滤波后的脉冲幅值

    Table 1.  Pulse amplitude after filter

    k 0.4 0.6 0.8 1 1.2 1.4
    幅值 0.870 1.077 1.129 1.129 1.129 1.129
    下载: 导出CSV

    表 2  电流信号参数

    Table 2.  Current signal parameter

    方波调光 脉冲调光
    占空比/% 50 30 20 10 5
    信号振幅/A 1 5 5 5 5
    载波频率/Hz 1000 1000 1000 1000 1000
    下载: 导出CSV

    表 3  不同占空比下γ与值β

    Table 3.  Value of γ and β in different duty ratio

    w2 5% 10% 20% 30% 40%
    β 1.542 2.181 3.084 3.777 4.362
    γ 1.611 2.315 3.347 3.877 4.65
    γ/β 1.044 1.062 1.085 1.026 1.066
    下载: 导出CSV
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出版历程
收稿日期:  2018-06-22
修回日期:  2018-09-21
刊出日期:  2019-02-18

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