Detection And Data Processing Of Weak Optical Signal

Weak optical signal detection as a branch of photoelectric detection technology has been applied in more and more fields for its unique advantages.As the development of new technique,the new devices with better performance are emergence,which leads to the development of weak optical signal detection.Noise processing of weak optical signal detection is the key to the detect technology,but the traditional methods of detection are very complex.In this paper,the characteristics of weak optical signal were used to design a simple detection system.Firstly,this paper introduced the background significance and the current research situation of weak optical signal detection.Secondly,the noise component is simply analyzed,and the overall structure of weak optical signal detection system is given.And the hardware part of circuit is described in detail,including photoelectric conversion circuit,logarithmic amplifying circuit and integral amplifying circuit,analog-to-digital conversion circuit and serial communication circuit that are controlled by microprocessor.In addition,the frequency characteristics and amplification characteristics of logarithmic amplification circuit are also studied.The results show that logarithmic amplifying circuit can realize the amplification of low frequency signal,improve signal to noise ratio and compress the dynamic range of signal.Finally,C# language is used to write upper-computer software that could realize data display,data processing and data storage.For the noise signal of darkness,algorithm is written to eliminate error.Otherwise,by using the principle of least square method,the temperature compensation model of photoelectric conversion circuit can be established to reduce the influence of temperature,thus reducing the error in the weak optical signal detecting system.Finally,the whole system is stabled by debugging,and results are analyzed and the future research is prospected.The results show that the weak optical signal detection system can accurate to detect the weak optical signal.At the same time,the whole system structure is simple,easy to implement,low cost,and more effectively detecting,which can be used in a variety of occasions to detect weak signals.