摘要现如今，光电检测技术广泛应用于各个领域，在本设计中光电检测技术主要应用于 3D打印领域。通过光电探测器探测非电量的光学信息进行转换， 输入信号的微弱导致输出信号同样微弱， 并容易在其中掺杂噪声干扰。所以需要 优良的放大电路对原始信号有效的放大。放大电路是连接原始微弱信号和后面信息处理系统的桥梁，因此，它的性能优劣直接关系着整个测试的准确性。所以设计高性能的前置光电探测器放大电路的意义十分重大。 本文以西门子公司生产的 SFH213FA型号的光电二极管作为前置光电探测器，设计了光电二极管放大电路，并对实测的数据进行了分析。所做的主要工作包括以下几个方面: 首先，对光电二极管的基本电流-电压转换电路进行了分析，提出了具有双运放的基本跨阻抗电路。 其次，对具有相位补偿功能的基本跨阻抗电路进行了改进，增加了电路的自举功能，这样避免了电容性电流和高频段时对光电二极管信号电流的吸收。自举功能的加入减小了电路的输入电容，提供了比基本电流-电压转换电路更高的带宽。 再次，对自举电路做了一些改进，使用复合放大器作为光电二极管的放大电路，并通过分析噪声频谱密度， 推导出了最大限度减小噪声带宽的最优设计公式， 具有重要的实际意义。 最后，制作了硬件实际电路。为了完成对激光熔池的实际测试，制作了相应的结构完善测试系统，放大电路减小了非激光发射光对光电二极管的影响， 减弱了外界环境对放大电路的干扰，最大的保证了测试的准确性。并对测试数据进行了数据的分析与处理。42009
毕业论文关键词  光电检测  相位补偿  自举  噪声Title    Laser district photoelectric diode of the melting process Data collection and analysis   Abstract Nowadays,  photoelectric  detection  technology  is  widely  applied  in  various fields, in this design, photoelectric detection technology is mainly used in the  field  of  3  d  printing.Through  photoelectric  detector  to  detect  non-electricity optical information transformation, the input signal of the weak output  signal  is  also  weak,  and  easily  mixed  noise  in  it.So  I  need  good performance  of  amplifier  circuit  of  the  original  signal  amplification effectively.Amplifying circuit is connected behind the original weak signal and information processing system of the bridge, therefore, its performance fit and unfit quality directly related to the accuracy of the entire test.So the design of high performance front significant importance of photodetector amplification circuit. Based on Siemens production SFH213FA models of photoelectric diode as a front photoelectric detector, amplifier circuit of photoelectric diode was designed and the measured data is analyzed.The main work includes the following aspects: First, the basic i-v conversion circuit of photoelectric diode are analyzed, and puts forward the basic transimpedance circuit with double op-amp. Secondly, the basic transimpedance circuit with phase compensation function is improved, increased the bootstrap circuit functions, so to avoid the capacitive current and high frequency band of the photodiode signal current absorption.The addition of bootstrap function reduces the input capacitance of the circuit, provides a higher bandwidth than basic i-v conversion circuit. Again,  the  bootstrap  circuit  made  some  improvements,  using  the  composite amplifier as amplifier circuit of photoelectric diode, and through the analysis of  the  noise  spectrum  density,  deduced  the  minimizing  noise  bandwidth,  the design formula of optimal has important practical significance. Finally, making the actual hardware circuit.In order to complete actual test of laser molten pool, making the corresponding test system, perfect structure of  amplifying  circuit  decreasing  the  influence  of  the  laser  light  to  the photodiode,  weakened  the  external  environment  disturbance  to  the  amplifying circuit,  the  biggest  guarantee  the  accuracy  of  the  test.And  the  test  data analysis and processing of data.    激光选区熔化过程中的光电二极管数据采集+PCB电路图:http://www.751com.cn/tongxin/lunwen_42280.html