摘要：随着科学技术的发展, 光电检测技术已广泛应用于军事、工业、农业、宇宙、环境科学、医疗卫生和民用等诸多领域。其具有能进行远距离、非接触、快速、高灵敏度的检测和传输的特点, 还具有检测信噪比高、抗干扰能力强、信息容量大等优点。采用光电检测方法的共同特点是: 被研究的信息通过各种效应( 机、热、声、电、磁) 调制到光载波上, 再将这些有用信号解调出来, 实现光信号与电信号的转换。各种光电检测电路是实现光电变换的重要环节。本论文从弱光信号检测系统的电路设计方案入手，论述了光电检测电路的基本工作原理，同时从电路形式设计和器件选择两方面论述了光电检测系统前置放大电路的设计要点，给出了采用AD795KN为前置放大器来设计放大电路、LM741C为放大器的有源滤波电路以及主放大电路，最终完成低噪声弱光强检测电路的设计。实验表明，基于本设计的检测系统电路可以有效测量弱光强信号，适用于一般光信号和弱光强信号的检测需要。9292
关键字：弱光强信号；光电检测；低噪声；前置放大器
Circuit design and production of low-light detection system
Abstract：With the development of science and technology, photoelectric detection technology has been widely used in many fields of military, industrial, agriculture, the universe, environmental science, health and civil.It has long-range, non-contact, fast, high-sensitivity detection and transmission characteristics, but also has a high signal-to-noise ratio of detection, anti-interference ability and information capacity.The common features are: using photoelectric detection method research information through a variety of effects (mechanical, thermal, acoustic, electric, magnetic) modulated optical carrier, and then demodulate these useful signal to achieve the conversion of the optical signal and electrical signal .Various photoelectric detection circuit is an important part of the photoelectric conversion. It starts from circuit design of the low light signal detection system, discusses the basic working principle of the photoelectric detection circuit. And from the form of circuit design and device selection discusses the design features of the optical detection system preamplifier circuit. AD795KN as preamplifier to design a amplifier circuit, LM741C amplifier active filter circuit and the main amplifier circuit which contribute to the final completion of the design of low-noise low-light intensity detection circuit. The experiments show that, based on the design of the detection system circuit can measure low light intensity signal and suitable for general optical signal and low light intensity signal detection needs.
Key Words: low light signal; photo-detect ; low-noise ; preamplifier
目录
1 绪论    1
1.1 光电检测技术的应用    1
1.1.1 光电检测技术在无损探伤中的应用    1
1.1.2 光电检测技术在印刷方面的应用    2
1.1.3 光电检测技术在其他方面的应用    2
1.2 光电检测技术的发展趋势    3
1.3 论文的研究内容    3
1.3.1 课题需要解决的主要问题    3
1.3.2 论文的主要架构    4
2 弱光强检测电路的设计理论    5
2.1 光电检测电路分析    5
2.1.1 电路基本原理    5
2.1.2 电路基本构成    5
2.2 光电二极管的工作模式及等效模型    6
2.2.1光电二极管的工作模式    6
2.2.2 光电二极管的等效电路模型    7
2.3 影响光电检测电路设计的因素    7
2.3.1 阻抗匹配    7
2.3.2 滤波电路    9 AD795KN+LM741C弱光强检测系统的电路设计与制作:http://www.751com.cn/zidonghua/lunwen_7951.html