基于振荡检测法的延迟线型声表面波气体传感器特性 (2015年)
需积分: 5 189 浏览量
2021-04-26
01:38:42
上传
评论
收藏 414KB PDF 举报
第
37
卷第
1
期
2015
年
1
月
南京工业大学学报(自然科学版)
JOURNAL
OF
NANJING
TECH
UNIVERSITY
(Natural
Science
Edition)
doi:
1O
.3969/j
.i
ssn.1671-7627 .2015.01.011
Vo
1.3
7
No.1
Jan.2015
基于振荡检测法的延迟线型声表面波气体传感器特性
杨柳，殷晨波，朱斌，张子立
(南京工业大学机械与动力工程学院，江苏南京
211800)
摘
要:研究延迟线型声表面泼
(SAW)
气体传感器的信号传输损耗和相位变化，考察了振荡检测法中相移电路和
滤波电路对传感器性能的影响。基于延迟线型
SAW
气体传感器简化数学模型和频率特性测试，探讨又指电极
(
IDTs)
对传感器性能和传输过程中信号相位幅值变化量的影响。利用不同阶低通滤泼器的性质和相移电路频率
特性曲线研究振荡电路对延迟线型
SAW
传感器振荡频率、灵敏度和稳定性的影响机制
O
结果表明:延迟线型
SAW
传感器插入损耗和信号带宽反比又指对数;传输过程中信号相位变化受振荡频率、波速和中心l!é，共同影响;滤泼器
幅频特性随滤波电路阶次降低而变好，同时传感器灵敏度提高。
关键词:延迟线型
SAW;
简化模型;又指电极;振荡电路
中图分类号:
TP212.
1
文章编号:
1671
一
7627(2015)01-0060-05
Characteristics of delay line type surface acoustic wave gas sensor
based on oscillation
Y
ANG
Liu
,
YIN
Chenbo
,
ZHU
Bin
,
ZHANG
Zili
(College
of
Mechanical
and
Power
Engineering
,
Nanjing
Tech
University
,
Nanjing
211800 , China)
Abstract:
The insertion loss and the variation phase of wave propagating
in
delay line type surface
acoustic wave
(SA
W)
gas sensors were investigated. The influence of phase-shift circuit and low-pass
filter circuit on the perfonnance of SA
W gas sensor based on oscillation was considered. The simplified
mathematical model and testing frequency characteristics of delay line type SA
W gas sensors were used
to
study the influence of metal inter-digital transducers
(IDTs)
on the characteristics of gas sensor, the
variation of wave
phase
and amplitude in propagation process. The influence mechanism of oscillation
circuit on oscillation frequency
, sensitivity and stability of SA W gas sensors was discussed , based on
properties of low-pass filter and frequency characteristics of phase shift circui
t. The insertion loss and the
signal bandwidth were decreased with increasing the number of IDTs. The phase change was influenced by
the oscillation frequency
, the acoustic velocity and the distance between
two
centers of IDTs. The phase-
frequency characteristics of low-pass
, filter were improved with decreasing the
order
of filters , and the
sensitivity of delay SA
W was increased with decreasing the order of filters.
Key
words:
delay line type SA
W;
simplified model; inter-digital electrodes; oscillation circuit
收稿日期
:2013-09
一
09
基金项目:国家自然科学基金
(50875122)
;江苏省普通高校研究生科研创新计划(
CXZZ11_0340)
作者简介:杨
柳
(1988-)
，男，江苏宿迁人，博士生，主要研究方向为声表面波气体传感器;殷晨波(联系人)
，教授，
E-mail:
yinchenbo@
njtech.
edu.cn
引用本文:杨柳，殷晨波，朱斌，等.基于振荡检测法的延迟线型声表面波气体传感器特性
[1J
南京工业大学学报.自然科学版，
2015
，
37
(1)
:60-64
资源评论
