毕业设计论文 外文文献翻译 测控技术与仪器 聚合物传感器集成到无线数据采集系统中以适合监测环境和生理的发展过程_精品.doc

DEVELOPMENT OF POLYMER-BASED SENSORS FOR INTEGRATION INTO A WIRELESS DATA ACQUISITION SYSTEM SUITABLE FOR MONITORING ENVIRONMENTAL AND PHYSIOLOGICAL PROCESSES Biomolecular Engineering Volume 23, Issue 5, October 2006, Pages 253-257 ABSTRACT In this work, the pressure sensing properties of polyethylene (PE) and polyvinylidene fluoride (PVDF) polymer films were evaluated by integrating them with a wireless data acquisition system. Each device was connected to an integrated interface circuit, which includes a capacitance to frequency converter (C/F) and an internal voltage regulator to suppress supply voltage fluctuations on the transponder side. The system was tested under hydrostatic pressures ranging from 0 to 17kPa. Results show PE to be the more sensitive to pressure changes, indicating that it is useful for the accurate measurement of pressure over a small range. On the other hand PVDF devices could be used for measurement over a wider range and should be considered due to the low hysteresis and good repeatability displayed during testing. It is thought that this arrangement could form the basis of a cost-effective wireless monitoring system for the evaluation of environmental or physiological processes. Key words: pressure; thick film; polymers; sensor; wireless 1. Introduction In many professions and industries, the ability to make measurements in difficult to reach or dangerous environments without risking the health of an individual is now a necessity. A way of wirelessly transmitting data from the sensor, which is at the point of interest, to a remote receiver is required. Using this approach, sensors can be implanted in a difficult to reach or harsh environment and left there for a period of time. Sensors designed to measure any number of parameters including pressure, conductivity and pH could be used (Barrie, 1992, Astaras, 2002and Flick and Orglmeister, 2000). Data transfer is typically achieved using radio frequencies to send information to a rec