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Multi-sensor (Multi-sensing) Surface Acoustic Wave Network Utilizing Orthogonal Frequency Coding for Increased Performance and Security

Technology Benefits

Can operate in harsh environments: -270┬░C to 1000┬░C and in radiation up to 400MRads Rapid response ΓÇô less than one second to detect and less than two minutes to return to normal Precise leak location reporting Secure transceiver-sensor communication Signal loss minimized by 30-60dB Increased bandwidth, more efficient for longer distances

Technology Application

This technology can be used in Radio Frequency (RF) and optical communication systems. It can be utilized for temperature, gas, and liquid sensors.

Detailed Technology Description

This OFC-SAW sensor technology began as a solution for NASA-Kennedy Space CenterΓÇÖs need for passive, wireless, and individually unique H2 gas sensors for ground, space-flight, and space-exploration applications. NASA and UCF researchers have developed this multi-sensory network comprised of independently operating and uniquely identifiable sensors using OFC-SAW technology. The unique tagging allows each sensor to precisely identify leak locations. The time and location of the sensing event are reported simultaneously. This novel OFC-SAW technique has processing gain, code division multiple access, spread spectrum, and security advantages. Complex coding methods ensure greater network security.These OFC-SAW sensors offer increased sensitivity, response time, and repeatability. Rapid H2 detection has been proven for flow rates as low as 1ccm of a 2% H2, 98% N2 mixture. These advantages are achieved through the unique process of gas sensing film deposition. The OFC-SAW sensor is built on a piezoelectric substrate which services as its power source and is activated by a wireless transmission to the device. Chemical sensing is made possible by placing a chemically sensitive film on the SAW substrate. For example, ultra-thin palladium (Pd) films and tin dioxide (SnO2) films were used for hydrogen sensing. Each device is designed to have multiple transducer / antenna pairs, each of which have a different center frequency, which reduces device losses and improves device performance. The SAW device is also durable enough to repeatedly survive large variations in temperature, which makes it an excellent candidate for a cryogenic environment.

*Abstract

Orthogonal Frequency Coded (OFC) Surface Acoustic Wave (SAW) sensors in a multi-sensory network to detect gaseous leaks in harsh environments with less than one second response time. This is a wireless, passive, and durable device with secure network communication and excellent for use in extreme environments.

*Principal Investigator

Name: Donald Malocha

Department: College of Engineering and Computer Science

Name: Derek Puccio

Department: College of Engineering and Computer Science

Country/Region

USA