Wireless Intelligent Sensor and Actuator Network
WISAN is Wireless Intelligent Sensor and Actuator Network. Existing sensor network do not completely satisfy requirements of problems posed by structural health monitoring: the proactive, constant data rate character of the data streams rather than traditional reactive, event-driven data delivery; mostly static node placement on structures with limited number of mobile nodes; real-time requirements to bidirectional data flow from sensors and to actuators.
WISAN is designed to address these issues and support massive arrays of heterogeneous sensors with constant data streams. The network interface is based on IEEE 802.15.4 standard.
WISAN has the following key features:
- WISAN provides low-cost massive data acquisition from arrays of heterogeneous sensors with constant data streams.
- Due to very low power consumption, WISAN utilizes low-cost power harvesting technologies or lasts years on a single battery.
- WISAN can be utilized worldwide in 2.4Ghz ISM frequency band and coexists with WiFi and other devices.
- The sensor nodes perform energy-efficient distribution of computational load by performing on-board compression, signal generation for actuators and evaluation of fuzzy rules.
- Each node on the network is synchronized with other nodes on the order of microseconds. The synchronization is periodically updated. This guarantees data acquisition by all nodes at the same time.
- Bandwidth utilization is maximized through bandwidth scheduling allowing to increase number of nodes in the network by factor of five.
- May 2008 WISAN experiments on a pre-steressed concete bridge in Kuala Lumpur, Malaysia
- May 2008 WISAN experiments on a steel girder bridge in NY State
- Aug 2006 WISAN-based load testing system (PDF version)
- July 2006 Field test of wireless strain and acceleration sensors
- June 2006 WISAN universal sensor platform for wireless acceleration and strain sensors
- April 2006 WISAN-2 platform
- Dec. 2005 A field test of WISAN
- Nov. 2005 Self-powered WISAN pressure sensor (through piezoelectric energy harvesting)
- Sept. 2005 Capabilities of the WISAN 1.1 platform are summarized in this flier
- Sept. 2005 IWSHM 2005 paper on testing accuracy of wireless accelerometers.
- Nov. 2004 Here is a description of a field test of WISAN.
- Sept 2004. Paper from Structural Materials conference.
- March 2004. The conceptual paper from 2004 SPIE NDE conference.