基于蓝牙技术的无线血氧监测仪的研究
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摘要
本课题介绍了人体生理信号远程监护系统的数据采集终端的研制，该终端主要是对人体重要生理参数之一血氧饱和度进行测量和分析，并通过蓝牙模块进行短距离无线传输。该终端主要由血氧信号采集、数据处理、蓝牙无线传输三部分组成。
本文首先介绍了血氧饱和度及蓝牙技术的有关知识以及无线血氧仪的系统构成，然后详细阐述了血氧传感器的硬件电路设计、单片机的信号处理及蓝牙无线传输部分的硬件设计及软件编程。主要做了以下几个方面的工作：
(1)分析血氧饱和度的测量原理，设计血氧传感器硬件电路；(2)分析CSR公司的BlueCore2-flash蓝牙模块，完成单片机与蓝牙模块的接口设计；
(3)分析蓝牙HCI协议和蓝牙模块的串口通信过程；
(4)在AVR单片机的C语言开发平台上实现数据采集、处理及蓝牙无线数据传输的软件设计。
在血氧监测仪硬件电路的设计中，采用光的调制技术，使得两路信号在同一个通道中进行预处理，降低了硬件电路的复杂度；对光电二极管发出的混合信号进行了去噪处理，降低了外界环境光的干扰，从而便于血氧信号的提取；为了简化开发过程和缩短开发周期，在蓝牙模块间的数据传输过程中采用外部处理器方式，利用HCI传输层作为单片机和蓝牙模块间的通信桥梁，通过收发HCI分组来实现蓝牙模块间的数据传输。
本课题把蓝牙技术应用于血氧饱和度监测系统，为实现血氧仪的无线化奠定了基础，从而可以在不影响正常生活和工作的情况下，对血氧信号进行实时监测，扩大了使用者的活动范围。
This dissertation mainly described the development of data-sampling terminal, a device whose functions are to sample the signal of oxygen saturation and transmit the data with BLUETOOTH module in long-distance monitoring system of physiological signal. This terminal device is composed of three parts constitute, which are oxygen saturation collection, data procession and transmission.
There are three segments in this paper , firstly the technical references about oxygen saturation and Bluetooth are introduced. The structure of pulse oximeter monitor with Bluetooth as transmission technique is following described. This dissertation focused on the signal process on MCU and the hardware, software design of wireless transmission based on Bluetooth.
Major work described as following:
(1)The analysis of measurement principal for oxygen saturation. The circuit design of oxygen sensor
(2) Realization of the interface between MCU and Bluetooth module after analyzing the blurcore2-flash manufactured by CSR corp.
(3) Analyzing the HCI protocol and the process of serial communication for Bluetooth module.
(4) The software, based on ANSI C embedded systems development tools for Atmel AVR microcontrollers, realized the data collection processing and transmission through Bluetooth.
The light modulation is the main technique in oxygenic signal collection. The complexity of circuit is reduced after pre-processing of two kind of signal in the same channel; The mixed signal emitted from photodiode is also processed to lessen the jam produced by environment light in order to pick up the signal easily. In order to simplify the development process and reduces the development cycle, the method of exterior processor is selected in the data transmission between two Bluetooth modules. In this way, the Host Controller Interface works as a bridge between the MCU and the Bluetooth module, and data is transmitted by the way of receiving and sending HCI Packet.
Because of the the application of Bluetooth in oximeter monitor to make it wireless, the user can wear it in order to inspect real-time oxygen saturation freely when they work and do some other things.
本文首先介绍了血氧饱和度及蓝牙技术的有关知识以及无线血氧仪的系统构成，然后详细阐述了血氧传感器的硬件电路设计、单片机的信号处理及蓝牙无线传输部分的硬件设计及软件编程。主要做了以下几个方面的工作：
(1)分析血氧饱和度的测量原理，设计血氧传感器硬件电路；(2)分析CSR公司的BlueCore2-flash蓝牙模块，完成单片机与蓝牙模块的接口设计；
(3)分析蓝牙HCI协议和蓝牙模块的串口通信过程；
(4)在AVR单片机的C语言开发平台上实现数据采集、处理及蓝牙无线数据传输的软件设计。
在血氧监测仪硬件电路的设计中，采用光的调制技术，使得两路信号在同一个通道中进行预处理，降低了硬件电路的复杂度；对光电二极管发出的混合信号进行了去噪处理，降低了外界环境光的干扰，从而便于血氧信号的提取；为了简化开发过程和缩短开发周期，在蓝牙模块间的数据传输过程中采用外部处理器方式，利用HCI传输层作为单片机和蓝牙模块间的通信桥梁，通过收发HCI分组来实现蓝牙模块间的数据传输。
本课题把蓝牙技术应用于血氧饱和度监测系统，为实现血氧仪的无线化奠定了基础，从而可以在不影响正常生活和工作的情况下，对血氧信号进行实时监测，扩大了使用者的活动范围。
This dissertation mainly described the development of data-sampling terminal, a device whose functions are to sample the signal of oxygen saturation and transmit the data with BLUETOOTH module in long-distance monitoring system of physiological signal. This terminal device is composed of three parts constitute, which are oxygen saturation collection, data procession and transmission.
There are three segments in this paper , firstly the technical references about oxygen saturation and Bluetooth are introduced. The structure of pulse oximeter monitor with Bluetooth as transmission technique is following described. This dissertation focused on the signal process on MCU and the hardware, software design of wireless transmission based on Bluetooth.
Major work described as following:
(1)The analysis of measurement principal for oxygen saturation. The circuit design of oxygen sensor
(2) Realization of the interface between MCU and Bluetooth module after analyzing the blurcore2-flash manufactured by CSR corp.
(3) Analyzing the HCI protocol and the process of serial communication for Bluetooth module.
(4) The software, based on ANSI C embedded systems development tools for Atmel AVR microcontrollers, realized the data collection processing and transmission through Bluetooth.
The light modulation is the main technique in oxygenic signal collection. The complexity of circuit is reduced after pre-processing of two kind of signal in the same channel; The mixed signal emitted from photodiode is also processed to lessen the jam produced by environment light in order to pick up the signal easily. In order to simplify the development process and reduces the development cycle, the method of exterior processor is selected in the data transmission between two Bluetooth modules. In this way, the Host Controller Interface works as a bridge between the MCU and the Bluetooth module, and data is transmitted by the way of receiving and sending HCI Packet.
Because of the the application of Bluetooth in oximeter monitor to make it wireless, the user can wear it in order to inspect real-time oxygen saturation freely when they work and do some other things.
引文
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