Liquid sensor probe using reflecting SH-SAW delay line
نویسندگان
چکیده
A new liquid sensor probe has been designed by using SH-SAW device. Shear horizontal mode surface acoustic wave (SH-SAW) has a unique characteristic of complete reflection at the free edges of the substrate. The SH-SAWare excited on a 368 YX LiTaO3 and the right angle edge of the substrate has been used to reflect the SAW. Multi-channel reflecting SAW delay lines were constructed on the substrate. Both the phase and amplitude of the SH-SAW reflected from the edge were measured as a sensor response. Several experiments were performed to verify the edge reflection type SAW sensor in liquid phase. A sensing system configuration is also suggested for the effective operation of the sensor probe. An electronic circuits system for accurately measuring the phase characteristics of the reflected wave and for detecting the output from the multi-channel SAW sensor probe was shown. # 2003 Elsevier Science B.V. All rights reserved.
منابع مشابه
SH-SAW Biosensor for Point-of-Care
1. Background, Motivation and Objective : Point of care testing (POCT) which is defined as diagnostic testing at or near the site of patient care has been required for future home healthcare. There are various important requirements for the biosensor platform for POCT, such as portable, cost per test, maximum achievable sensitivity and specificity, ease of use and wireless connectivity. 2. Stat...
متن کاملSingle Sh-saw Sensor as a Distributed Sensor Array for Liquids Recognition
Basic possibility to use single-channel shear-horizontal surface acoustic waves sensor constructed as a delay line on multilayered structure with 36 YX LiTaO3 substrate for liquids recognition has been proposed. The changes under analytes influence of the sensor pulse responses obtained by transformation to time domain of one of the S-parameters measured in frequency domain have been used as se...
متن کاملSimultaneous Surface Manipulation and Sensing in a Biosensor Using a Hexagonal Saw Device
We present the development of a hexagonal surface acoustic wave (SAW) device to simultaneously sense and manipulate the biological sensing film in biosensor applications. The primary objective is to improve sensitivity and selectivity. A secondary objective is to regenerate the sensor for reuse. A hexagonal device fabricated in 36° lithium tantalate allows for propagation of both Rayleigh and s...
متن کاملMass sensitivity of dual mode SAW delay lines on AlN=sapphire structure
Introduction: There have been growing demands in recent years for highly sensitive surface acoustic wave (SAW) sensors that are able to detect minute quantities, especially in the chemical and biological fields. AlN is a promising material to fulfil such a task because of its high SAW velocity and good piezoelectricity [1]. Compared to conventional bulk piezoelectric materials such as quartz an...
متن کاملSingle Interdigital Transducer Approach for Gravimetrical SAW Sensor Applications in Liquid Environments
Surface acoustic wave (SAW) devices are well known for mass-sensitive sensor applications. In biosensing applications, chemical and biochemically evoked binding processes on surfaces are detected in liquid environments using delay line or resonator sensor configurations, preferably in combination with the appropriate microfluidic devices. All configurations share the common feature of analyzing...
متن کامل