中国工业检验检测网www.industryinspection.c
中国工业检验检测网www.industryinspection.c
中国工业检验检测网www.industryinspection.c
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www.<strong>industryinspection</strong>.com QQ:596705349 <br />
Vol. 28 No. 5 28 5 <br />
Oct . 2009 HEBEI EL ECTRIC POWER 2009 10 <br />
Wave ,L W) , Ddw(2) :<br />
,2 <br />
(Backwall Wave ,BW) ,<br />
Ddw = [ t 2 (cw + tp ) 2<br />
- d 2 ] 1 2<br />
4<br />
- (2)<br />
, :c ; tw ;<br />
TOFD ,<br />
<br />
,(Diff raction Signal) <br />
,2 <br />
,, TOFD <br />
,<br />
2 TOFD ,<br />
A <br />
<br />
7 M Hz ,60 ,<br />
5 900 m/ s ,100 mm ,32<br />
mm ,,(1) (2) ,<br />
Dds = 8. 3 mm ;<br />
Ddw = 1. 6 mm <br />
, TOFD <br />
, <br />
2. 2 TOFD <br />
TOFD ,<br />
,3 <br />
( ) ,3 4 <br />
5 <br />
www.industryinspecti<br />
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2 TOFD A <br />
2 ,<br />
, <br />
,TOFD<br />
,( RF) <br />
<br />
,<br />
,,<br />
,<br />
,<br />
3 1 (:mm)<br />
4 2 (:mm)<br />
2 TOFD <br />
2. 1 TOFD <br />
TO FD ,<br />
<br />
Dds <br />
(1) :<br />
Dds = [ (ctp ) 2<br />
+ dctP ] 1 2 (1)<br />
4<br />
:c ; tp (10 %<br />
) ; d 1/ 2 <br />
,<br />
5 3 (:mm)<br />
1 0. 5 mm 1 mm 2 mm 4 mm<br />
,2 <br />
1 mm 2 mm 4 mm 6 mm 8 mm (<br />
3 mm) ,3 2 mm 6 mm 8 mm <br />
(2 mm) 20 mm ,<br />
5 M Hz 1. 5 <br />
300 ns ,60 5 900 m/ s ,<br />
27<br />
<br />
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