Relative humidity sensing by PVA-coated dual resonator SAW oscillator

被引：132

作者：

Penza, M ^{[1
]}

Cassano, G ^{[1
]}

机构：

[1] PASTIS, CNRSM SCpA, I-72100 Brindisi, Italy

来源：

SENSORS AND ACTUATORS B-CHEMICAL | 2000年 / 68卷 / 1-3期

关键词：

SAW relative humidity sensor; dual resonator SAW oscillator; hygroscopic polyvinyl-alcohol film;

D O I：

10.1016/S0925-4005(00)00448-2

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

A highly sensitive Surface Acoustic Wave (SAW) sensor system for relative humidity (RH) detection using chemically interactive polyvinyl-alcohol (PVA) film with implemented electronic module is described. The system configured as a dual resonator SAW oscillator consists of two SAW resonators, two RF amplifiers, and a mixer. The mixed frequency has been considered as output of the SAW sensor. The SAW response toward 60% RH has been measured as a frequency change of about -11.5 MHz, at room temperature. A cross-sensitivity of the PVA film toward organic vapours with bonded OH groups has been also detected. The RH sensing characteristics, at room temperature, of the PVA-based dual SAW sensor have been analyzed in terms of sensitivity, calibration curve, detection limit, noise, water-resistance, short-medium term repeatability, aging, and sensing performances comparison. (C) 2000 Elsevier Science S.A. All rights reserved.

引用

页码：300 / 306

页数：7

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