Fast Measurement System Of 4 Physiological Parameters Based On ARM

At present, it is determined whether a special group of pilots could carry out the flight task by asking physical conditions, measuring temperature, pulse wave, blood pressure and so on. Since in the process of checking pilots'physical conditions, there is not a set of measures which can measure basic physiological parameters conveniently, fast and accurately, and the efficiency is poor, this project aims to develop a fast system of measuring 4 basic physiological parameters, such as temperature, pulse wave, respiration, blood pressure and so on. The measurement is completed in about 20 seconds before a pilot carries out flight, even when he wears pilot's clothes.The fast system of measuring 4 physiological parameters based on ARM collects ECG signals, two channels of pulse wave signals and temperature. After modulating and filtering the signals by circuits, ECG signals and pulse wave signals are sent into single-chip of MSP430F5418 and temperature signals are sent into single-chip of C8051F430 to be inverted to digital signals from analog signals by AD acquisitions. ARM of Beijing Y&C Technology co., Ltd is responsible to receive the digital ECG signals and pulse wave signals through one RS232 serial port and temperature signals through the other RS232 serial port. And then filter and identify these physiological signals, calculate respiration rate, measure arterial blood pressure by pulse wave transit time(PWTT) in real-time, and finally display ECG signals, two channels of pulse wave signals, blood pressure,respiration rate and temperature.This system measures blood pressure continuously by linear relation between blood pressure and PWTT. So we proposed the experiment which could obtain the parameters of different individuals, and could determine which characteristic beginning point of pulse wave to be used and the relation between PWTT and systolic pressure. It was validated that the best beginning point of pulse wave should be in the point of maximum differential coefficient in its rising slope, and measuring blood pressure by linear relation between systolic pressure and PWTT was proved to be effecient.And we proposed another experiment to validate the accuracy of respiration rate calculated by ECG signals. It was proved that the most error was 5.3%, that was 0.31s per respiration period when the results were compared by which was calculated from airflow.The unit of temperature measurement is composed of the unit with low and constant environmental temperature, ultrasonic ranging unit and infrared detecting unit. The unit with low and constant environmental temperature provides infrared detector low and constant temperature, in order to avoid the influence of environmental temperature. The ultrasonic ranging unit is used to measure the distance between the object and the infrared detector to compensate the influence of measuring distance. And these two units both increase the precision of infrared temperature measurement.The measuring system processes signals based on ARM9. It is of characteristics of small size, low-power consumption, high performance, and low cost, and it has a great advantage to process real-time signals. It will realize intellectualized, fast, and portable purposes when ARM is applied in medical systems.