PMID: 16529112Mar 15, 2006Paper

Orthogonal frequency coding for SAW tagging and sensors

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
Derek PuccioJacqueline H Hines

Abstract

Surface acoustic wave (SAW)-based sensors can offer wireless, passive operation in numerous environments, and various device embodiments are used for retrieval of the sensed data information. Single sensor systems typically can use a single carrier frequency and a simple device embodiment because tagging is not required. In a multisensor environment, it is necessary to both identify the sensor and retrieve the sensed information. This paper presents the concept of orthogonal frequency coding (OFC) for applications to SAW sensor technology. The OFC offers all advantages inherent to spread spectrum communications, including enhanced processing gain and lower interrogation power spectral density (PSD). It is shown that the time ambiguity in the OFC compressed pulse is significantly reduced as compared with a single frequency tag having the same code length, and additional coding can be added using a pseudo-noise (PN) sequence. The OFC approach is general and should be applicable to many differing SAW sensors for temperature, pressure, liquid, gases, etc. Device embodiments are shown, and a potential transceiver is described. Measured device results are presented and compared with coupling of modes (COM) model predictions to demons...Continue Reading

References

Feb 2, 2008·IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control·S E Carter, D C Malocha
Feb 5, 2008·IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control·E BenesA Pohl
Jan 1, 1987·IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control·D C Malocha, C D Bishop

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Citations

Mar 12, 2013·IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control·Daniel R GallagherDonald C Malocha
Aug 18, 2012·IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control·Nancy Saldanha, Donald C Malocha
May 2, 2009·IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control·Sanna HärmäPaul Hartogh
Apr 15, 2008·IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control·Daniel R GallagherNancy Saldanha

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