Effects of the Set Phase Position on the Response of a SAW Resonator Oscillator Based Chemical Sensor

被引:4
作者
Kshetrimayum, Roshan [1 ]
机构
[1] Univ Delhi, Dept Phys, Kirori Mal Coll, Delhi 110007, India
关键词
Equivalent circuit model; surface acoustic wave (SAW) oscillator; SAW resonator; SAW sensor; sensitivity analysis; viscoelastic polymer; THICKNESS-SHEAR MODE; ACOUSTIC-WAVE DEVICES; POLYMER-COATINGS; VAPOR SENSORS; SENSITIVITY;
D O I
10.1109/JSEN.2013.2240564
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
Theoretical calculation results are described to illustrate the experimental results of the dependencies of surface acoustic wave resonator sensor's sensitivity on the set phase position within an oscillator circuit. The experiment highlights that the dependencies are insignificant for thin coatings but quite significant for thick coatings. The calculations were performed using an equivalent circuit model for polymer loading that incorporates a sensitivity factor or phase dependent factor. The datasheet parameters of the device used in the experiment are utilized to simulate the electrical behavior of the sensor. Based on a ratio R of the coating film strain magnitudes induced by cross-film to in-plane gradients, the thickness regime of operations are defined such that if R << 1, the film is acoustically thin and if R >= 1, the film is thick. It is shown that, with film thickness as a parameter, while the sensitivity factor curves are unaffected for R in the range from 0.46 to 0.91, the curves exhibit a prominent spike shape with varying magnitude around resonance peak for R in range from 1.37 to 3.65. With shear modulus as parameter, varying R from 0.65 to 8.23 also results in a spike shape sensitivity factor curves with its peak magnitude varies from 1.026 to 1.92. These results show that in the thick regimes, depending on the magnitude of the sensitivity factor at a point of circuit oscillation, the sensitivity of the sensor may not only increase or decrease but also change its direction. The calculation results thus show consistency with the experimental result.
引用
收藏
页码:1662 / 1668
页数:7
相关论文
共 20 条
[1]   Gas Sensitivity Comparison of Polymer Coated SAW and STW Resonators Operating at the Same Acoustic Wave Length [J].
Avramov, Ivan D. ;
Rapp, Michael ;
Kurosawa, Shigeru ;
Krawczak, Piotr ;
Radeva, Ekaterina Ivanova .
IEEE SENSORS JOURNAL, 2002, 2 (03) :150-159
[2]   Modeling the responses of thickness-shear mode resonators under various loading conditions [J].
Bandey, HL ;
Martin, SJ ;
Cernosek, RW ;
Hillman, AR .
ANALYTICAL CHEMISTRY, 1999, 71 (11) :2205-2214
[3]   Performances of mass-sensitive devices for gas sensing: Thickness shear mode and surface acoustic wave transducers [J].
Bodenhofer, K ;
Hierlemann, A ;
Noetzel, G ;
Weimar, U ;
Gopel, W .
ANALYTICAL CHEMISTRY, 1996, 68 (13) :2210-2218
[4]  
FRYE GC, 1989, J SENS MATERIALS, V1, P335
[5]   SURFACE ACOUSTIC-WAVE VAPOR SENSORS BASED ON RESONATOR DEVICES [J].
GRATE, JW ;
KLUSTY, M .
ANALYTICAL CHEMISTRY, 1991, 63 (17) :1719-1727
[6]   Comparisons of polymer/gas partition coefficients calculated from responses of thickness shear mode and surface acoustic wave vapor sensors [J].
Grate, JW ;
Kaganove, SN ;
Bhethanabotla, VR .
ANALYTICAL CHEMISTRY, 1998, 70 (01) :199-203
[7]   Simulation of viscoelastic effects of polymer coatings on surface acoustic wave gas sensor under consideration of film thickness [J].
Kondoh, J ;
Shiokawa, S ;
Rapp, M ;
Stier, S .
JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS, 1998, 37 (5B) :2842-2848
[8]   Modeling electrical response of polymer-coated SAW resonators by equivalent circuit representation [J].
Kshetrimayum, Roshan ;
Yadava, R. D. S. ;
Tandon, R. P. .
ULTRASONICS, 2011, 51 (05) :547-553
[9]   Mass sensitivity analysis and designing of surface acoustic wave resonators for chemical sensors [J].
Kshetrimayum, Roshan ;
Yadava, R. D. S. ;
Tandon, R. P. .
MEASUREMENT SCIENCE AND TECHNOLOGY, 2009, 20 (05)
[10]   SURFACE ACOUSTIC-WAVE RESPONSE TO CHANGES IN VISCOELASTIC FILM PROPERTIES [J].
MARTIN, SJ ;
FRYE, GC .
APPLIED PHYSICS LETTERS, 1990, 57 (18) :1867-1869