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上述导波换能器中，PZT压电晶片具有体积小、重量轻、成本低的优点，适用于结构健康状态监测应用，因此目前各国研究团队主要使用PZT压电晶片作为导波激发和接收换能器。
3.2 导波激发波形优化
超声导波具有频散特性，不同频率的波包成分的传播速度不同，成为频散现象。严重的频散现象会造成检测信号混淆、缺陷特征无法提取。为了避免此问题的发生，需要对导波激发频率和波形进行优化。
超声导波激发波形通常使用经汉宁窗调制的5周期正弦波。汉宁窗的作用是降低由于波形忽然开始和忽然结束造成的频率旁瓣，使得能量集中于激发频率。通过对激发信号的加窗调制可以减小激发信号的频带宽度，减小频散效应。图4为200kHz正弦波和加窗调制后的波形，以及其对应的频谱。
图4 5周期200kHz正弦波与加窗调制对比:
(a)原始信号，(b)原始信号频谱，(c)汉宁窗调制信号，(d)调制信号频谱
3.3 超声导波检测平台
超声导波检测方法不同于常规超声检测，它***突出的优点就是可以实现快速、大范围检测，而不是逐点检测，同时为较******缺陷，必须在试验中确保检测数据的精度。因此在构建检测平台上，针对超声导波的特殊性(如所选激励信号的特殊性，压电陶瓷换能器选取的特殊性等)，建立了超声导波检测平台，如图5所示。
Applied Materials 3300-05006
Applied Materials / AMAT 0010-17798-002 M11-097-0949
Applied Materials 0140-08743 001 MUL-P1 TRANSFER I/O CA
Applied Materials SST129 SPIN OLD CPA
2X HOERBIGERORIGA/?Applied Materials 25C-APPLIED-15 Rodl
Applied Materials 0021-17719 REV.005 12939900
Applied Materials/AMAT 0021-20788EC Shield 8"
Applied Materials/AMAT 0200-10073 Insulator Quartz 200m
Applied Materials 0040-78341 DUCT. 2 WAY FLOOR EXHAUST
Applied Materials 3300-01639 FTG TBG UN TEE 3 X 3/8T 31
Applied Materials 3860-01029 402244R-X2 Heat Exchanger
Applied Materials 0240-20300 KIT PNEU PER MFC OR FINAL
Applied Materials/AMAT 0200-00218 Quarz Plate
Applied Materials / AMAT 0240-76735 KIT FLOOR MOUNT GEN
Applied Materials 0040-75904 REV B K***-074-8032
Applied Materials 0680-01626 CBMAG THERM 1P 120/240V 10
Applied Materials 0620-01164 CABLE ASSY 332CG 6" LG + 2
Applied Materials 3300-04432 FTG PIP CONN 1/2T X 1/2 -1
Applied Materials / AMAT 0021-15657 SHUTTER DISC MDP 30
Applied Materials PLM201/CLEANER 208VAC 25A
Applied Materials DEUBLIN 957-600 0190-01272 w/VEXTA FB
Applied Materials 0140-06465 Cable HARNESS ASSY AMAT KV
Applied Materials/AMAT 0200-02420 Dep Ring
Applied Materials 0150-01027 REV 001 RTRON Cable
2x Applied Materials 3860-01003 TBG METAL 3/8 OD .35 WA
LOT OF 6 Applied Materials 3700-01474 414122-P4 Mainfra
Applied Materials/AMAT 0200-00410EC Gas distribution Pl
Applied Materials 0020-22453 TOOL ROBOT CLAMP ASSY
Applied Materials 0620-00573 CABLE
Applied Materials 0150-36345 REV 001 CABLE
Applied Materials 0150-76760 REV 002 RTRON CABLE
Applied Materials 0020-40412 BLANK NON-ENP CERTERFINDER
Applied Materials FACTORY INTERFACE DIGITAL I/O 0190-22
Applied Materials 423960-P4 Chamber 2 0040-51790 BRACKE
Applied Materials AMAT 0020-26312 Shield upper 8" Duras
Applied Materials/AMAT 0020-24018 Pin Antenna
Applied Materials 3320-01026 J016R08-PJ Mainfram Cable
Applied Materials 0242-04262 KIT CRYO COMP QDISC CUSTOM
Applied Materials 0020-53581 ROLLING SEAL 300MM TITAN P
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Applied Materials 0270-76118 ARM LEVELING TOOL DBR 4025
Applied Materials/***C 0040-037955 0040-03792 0021-70415
Applied Materials 0020-28756 REV 002 STUD CRYO/GATE VAL
Applied Materials 0040-40833 BUS BAR POWER SUPPLY CB LO
NOVELLUS SYSTEMS INTERFACE FE/LL C3 VECTOR 26-283968 03
Applied Materials 3320-02241 GSKT 6" CFF OFHC COPPER 41
Applied Materials 0040-40834 BUS BAR POWER SUPPLY LOAD
Applied Materials 3690-02667 413407-P4 SCR MACH HEX HD
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Applied Materials 3860-01160 AME7873-01 Shipalong Misc
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Applied Materials/AMAT 0020-27123 Pedestal 8" SNNF
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Applied Materials 0190-10270 3M 56039-6
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