Fast-response surface acoustic wave humidity sensor based on hematoporphyrin film
作者： R. Rimeika , D. Čiplys , V. Poderys , R. Rotomskis , M.S. Shur
DOI: 10.1016/J.SNB.2009.02.009
关键词: Surface acoustic wave sensor 、 Analytical chemistry 、 Humidity 、 Wavelength 、 Optics 、 Surface acoustic wave 、 Phase (waves) 、 Attenuation 、 Chemistry 、 Relative humidity 、 Amplitude
摘要: Abstract The fast-response and high-sensitivity surface acoustic wave sensor based on the hematoporphyrin (Hp) layer–lithium niobate (LiNbO 3 ) structure has been investigated. amplitude phase of Hp–LiNbO SAW delay line output signal were measured as functions relative humidity (RH) at steady-state conditions time upon step-like RH variation. Both attenuation velocity strongly depend due to water sorption by Hp film. At frequency 86 MHz, changes −0.8 dB in transmission loss −3° per 1% obtained, corresponding 110 ppm/1% change 1.23 × 10 −3 wavelength. exhibits fast response step jump up recovery abrupt drop down with characteristic times about 1 s. applicability for human breath monitoring is demonstrated.
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