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Orthogonal Frequency Coded Surface Acoustic Wave Passive Remote Sensing

机译：正交频率编码表面声波无源遥感

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Surface acoustic wave (SAW) devices are attractive for sensing of the physical, gas, liquid or biological environment because the device has many parameters which can be adjusted for various applications. The temperature coefficient of delay can provide temperature sensing, coupling to liquids, gases or applied films can be controlled by choice of mode, and putting the device under stress or strain can measure pressure or vibration. In addition, there are many substrate choices to attempt to optimize a given measurand. Finally, substrate choices allow sensing from cryogenic to high temperatures (1000℃), which has the potential for use in a wide spectrum of space applications. This paper will describe a novel SAW sensor platform for sensing of various measurands which is passive and wireless, and has several levels of coding available for providing identification. The paper will describe the concept of orthogonal frequency coding used in the device identification and its advantages in communications and sensing, and the mechanism for implementation using reflectors in a SAW sensor. Results of measured SAW device performance versus the coupling of mode (COM) model predictions show excellent correlation for a 250 MHz device on a lithium niobate substrate. The approach presented uses frequency selective reflectors in a differential delay line to measure temperature; measured from cryogenic temperatures to 150℃ with the same device. A discussion of substrate materials and device parameters will be presented to exemplify the versatility and practicality of these devices to a wide range of sensor applications.
机译：声表面波（SAW）设备对于感测物理，气体，液体或生物环境具有吸引力，因为该设备具有许多可以针对各种应用进行调整的参数。延迟的温度系数可以提供温度感应，可以通过选择模式来控制与液体，气体或已涂膜的耦合，并将设备置于压力或应变下可以测量压力或振动。另外，有许多基板选择可以尝试优化给定的被测量物。最后，基板的选择允许从低温到高温（1000℃）的传感，这有可能在广泛的空间应用中使用。本文将描述一种新颖的声表面波传感器平台，用于感应各种被测量物体，该平台是无源的和无线的，并且具有可用于提供识别的几种编码级别。本文将描述用于设备识别的正交频率编码的概念及其在通信和传感中的优势，以及在声表面波传感器中使用反射器的实现机制。测量的SAW器件性能与模式耦合（COM）模型预测的结果表明，铌酸锂衬底上的250 MHz器件具有极好的相关性。提出的方法在差分延迟线上使用选频反射器来测量温度。在同一设备上从低温到150℃进行测量。将对基板材料和设备参数进行讨论，以举例说明这些设备在各种传感器应用中的多功能性和实用性。

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