| The parameters of blood change significantly with the change of human health,so the blood routine examination has become a significant part of disease examination in clinic.In modern hospitals,blood routine data are basically obtained by operating a blood analyzer to test blood samples of patients.The traditional blood analyzers are operated for the count of blood cells,the classification of white blood cells and the content of hemoglobin.On this basis,the multifunctional blood analyzer not only realizes the automation of detection process,but also provides a well human-machine interface with maintenance,quality control,calibration,printing and other functions.Embedded technology makes use of customized embedded computer system to control relevant execution devices,which meets the automation requirements of blood analysis processes.It has been widely used in the development of multifunctional blood analyzer.However,with the advancement of the times and technology,new requirements are put forward for the number of parameters and functions of the hematology analyzer.After the evaluation of the existing three-differential hematology analyzer,it is found that the system has some shortages,such as poor flexibility of the overall structure of the system,algorithm loopholes,incomplete functions and the imperfect communication scheme which is harmful to the information security.Computer technology is applied to distributed control systems to centrally manage and decentralized control the system operation process.The distributed control system has excellent flexibility and reliability.So,the embedded software of a multifunctional hematology analyzer is developed.Firstly,the research background and significance of this dissertation are reviewed,and the concepts of distributed system and CAN bus are briefly introduced.The advantages of embedded technology in the development of hematology analyzers are also pointed out.Then the principles of blood analysis are summarized and the existing three-differential hematology analyzer system is evaluated.To solve the problem that it is hard to add new measure devices to the system that has been established,a design scheme that biochemical measurement devices can be added as distributed subsystems and centralized controlled by the management machine is proposed.A variety of functional requirements and the corresponding performance index requirements are put forward.The whole hematology analyzer is divided into two parts: the control system and the management system.Then the software structure and testing function of the control system are discussed.To solve the problem that there are several loopholes in the data processing algorithm for the original device,an effective signal processing flow and the optimized recognition algorithm based on Coulter principle are proposed.The feasibility of the algorithm is verified by Matlab simulation;Then the hierarchical and modular software design scheme of the management system are described.The quality control function and printing function are improved in the management software;Then the basic communication principle of the CAN bus is summarized,and the design scheme of CAN bus communication of the original three-differential hematology analyzer is evaluated.To guarantee the information security,the communication software based on CAN bus is redesigned.Finally,the validity and scientificity of this scheme is verified after united test and evaluations of the three-differential hematology analyzer and the measuring equipment of C-reactive protein.It is confirmed that the whole system meets the functional requirements and performance requirements proposed in the requirements analysis. |
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