Ultrasonic Gas Sensing by Two-Dimensional Surface Phononic Crystal Ring Resonators
Küçük Resim Yok
Tarih
2019
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Amer Chemical Soc
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
An acoustic ring resonator employing a two-dimensional surface phononic crystal is proposed for high-sensitivity detection in binary gas mixtures. Band analyses and frequency-domain simulations via the finite-element method reveal that a single band for spoof surface acoustic waves appears at ultrasonic frequencies around 58 kHz where modification of its dispersion due to varying gas composition results in a linear shift of the resonance frequency. The shift rate is -17.3 and 8.8 mHz/ppm for CO2 and CH4, respectively. The linear shift of resonance frequency is experimentally validated. In addition, the ring resonator can also be employed to track acoustic intensity variation with gas concentration, where exponentially decaying intensity for low concentrations leverages high-sensitivity operation.
Açıklama
Anahtar Kelimeler
ultrasonic gas sensors, Helmholtz cavity, phononic crystal, ring resonator, finite-element method
Kaynak
Acs Sensors
WoS Q Değeri
Q1
Scopus Q Değeri
Q1
Cilt
4
Sayı
7
