Development Of Atmospheric Flow Field Measurement System Based On Transmission Principle

Atmospheric visibility and atmospheric turbulence intensity are two key meteorological elements in meteorology,and they take nonnegligible roles in optical communication,atmospheric boundary layer,sea,land and air traffic,military activities and other fields.Poor visibility causes traffic inconvenience and even threatens personal safety.The existence of turbulence is an important reason for the distortion of light in the process of propagation.There is a complex relationship between turbulence and visibility,which is one of the factors affecting visibility measurement.Thus,in order to detect and study characteristics of atmospheric visibility and atmospheric turbulence,we should consider the complicated relationship between the motion of atmospheric turbulence air mass and aerosol particles.But traditional instruments only measure visibility or atmospheric turbulence,ignoring the interaction between.Traditional instruments are complicated to manufacture,expensive to build,and cannot simultaneously measure turbulence and visibility.To avoid this situation,th system in this paper includes ?/? conversion circuit,amplification filter circuit,digital control circuit and upper computer software design.The specific work is as follows:(1)First of all,analyzing the development status and common measurement methods of atmospheric visibility instruments and turbulence measuring instruments,finding the commonality of these two parameter measurements from the theory of atmospheric radiation transmission and the wave theory of light,and theoretically prove the feasibility and accuracy of synchronous measurement.(2)On this basis,proposing the overall design scheme of hardware circuit,including ?/?conversion circuit,amplification circuit,filter circuit,power circuit and digital circuit.For each circuit part,the index parameters of different types of chips is carefully compared,different circuit topologies is repeatedly compared,and finally the most suitable circuit structure and core devices for the project requirements is determined.Analyzing the logic of the whole system,programing the preparation of single-chip microcomputer to control the whole system operation.(3)Then,analyzing the software requirements,developing the upper computer software with C#,combining with the requirements of the project,designing a software specially for the operation of the whole system,analyzing and processing the collected data.(4)Finally,drawing and producing the circuit board,and testing the circuit in the laboratory.Conducting outdoor tests on the whole system,analyzing and comparing the result with that detected with existing instruments.The fact shows that the system works well in the evening and the result is basically consistent with that detected with existing instrument measurement results.The whole measurement system is designed and developed successfully.The measurement data collected in winter and summer is analyzed and compared with the existing instruments.The measurement results show that the system is available and more cost-effective than the traditional instrument design.It provides a scientific basis for studying the influence of turbulence intensity on visibility.At the same time,the new system provides a new method to study the interaction between boundary layer turbulence and aerosol particles.It is of great significance in atmospheric environment detection and atmospheric quality estimation.