The Study And Design Of Smart Transducer Adaptive Perception And Network Interface

With the rapid development of the internet of things (IOT), various kinds of sensor interfaces hinder the healthy development of sensors. AS the applying of computer technology and communications technology in sensor technology, there is a direction to make modern sensor automated, networked, standardization and intelligentize. Therefore the study of the networked smart sensor has an important academic value, social benefits and prospects for future development.6LoWPAN standard depicts the way of connection between LoWPAN and IPv6. The application of6LoWPAN in the networked smart sensor makes it more convenient for the sensor connection into Internet, which can speed up the pace of the development of the IOT.This dissertation focused on the study of networked smart sensor module. Firstly, this dissertation descripts the development of sensors both at home and abroad. And the next is the brief overview of the IEEE1451standards and the6LowPAN technic. On the foundation and combination of those, this dissertation designs and improves the wireless plug and play smart sensor, which is a new exploration on the networked smart sensor. The main context and innovations include:(1). Inspired from the IEEE1451.2wire sensor network interface design, this dissertation proposed a new baud adaption strategy:minimum active-low time difference algorithm(MALTD), which satisfies the need of UART interface baud adaption in the plug and play technology. What’s more, the use of an improved CSMA/CD data collision process strategy in the application of UART bus data transmission makes the interface of smart transducer interface module more flexible when connecting other device.(2). On the basis of the study of6LoWPAN technology, this dissertation designs the end point device and edge router device used in6LoWPAN wireless network, which is the essential part of the6LoWPAN WSN. Then embed the IEEE1451standards into the application layer of the6LoWPAN stack and design the wireless transducer interface module (WTIM) and network capable application processor(NCAP).(3). In order to reduce power consumption in the wireless sensor network caused by data transmission, this dissertation adopts6LoWPAN frame head compression technology to increase the length of payload in the UDP layer. What’s more, in the case of no affected on sensor identification, compress the transducer electric data sheet (TEDS) at the most to fit the frame length limit of IEEE802.15.4standard. As a result, the data length of TEDS’ field decreases and we can transfer more information in one frame. There are more advantages by doing this, for example, decreasing wireless network communication traffic and the collision probability among sensor nodes, reducing power consumption caused by data transmission. Most important of all, it can increase the sensor recognition velocity and efficiency of wireless smart sensor in the plug and play application.(4). Combine the IEEE1451.2and IEEE1451.5standard and take advantage of the plug and play technology of STIM used in wire data transmission, the transducer embedded IEEE1451.2standard is applied as a sensor data sampling module in the wireless transducer interface module (WTIM) design using6LoWPAN, which are connected by UART interface. The STIM and network capable application processor are worked in a same protocol and realized the plug and play technology.