Nutrient
发表于 2025-3-25 04:43:19
Piezo-electric Methods of Generation and Reception of Ultrasonic Wavesion except that they are excited in the material concerned by the contact face of a . which oscillates with the desired wave-form and frequency. For detection a . has been assumed which likewise has a contact face and which is capable of measuring the sound pressure of an incident wave. Both devices
剥皮
发表于 2025-3-25 09:28:42
http://reply.papertrans.cn/95/9406/940565/940565_22.png
Fortuitous
发表于 2025-3-25 15:07:18
http://reply.papertrans.cn/95/9406/940565/940565_23.png
蛤肉
发表于 2025-3-25 16:20:20
The Pulse-Echo Method; Design and Performance of a Pulse-Echo Flaw Detector propagates into a specimen with the ultrasonic velocity corresponding to the material concerned. Part of the ultrasound will be reflected if it strikes an obstacle in the form of an inhomogeneity and, if this is not too large, the remainder will travel further to a boundary of the specimen and will
Goblet-Cells
发表于 2025-3-25 20:31:27
http://reply.papertrans.cn/95/9406/940565/940565_25.png
BUDGE
发表于 2025-3-26 01:53:17
http://reply.papertrans.cn/95/9406/940565/940565_26.png
体贴
发表于 2025-3-26 04:49:46
http://reply.papertrans.cn/95/9406/940565/940565_27.png
缩减了
发表于 2025-3-26 10:10:21
http://reply.papertrans.cn/95/9406/940565/940565_28.png
Headstrong
发表于 2025-3-26 13:13:40
http://reply.papertrans.cn/95/9406/940565/940565_29.png
松软
发表于 2025-3-26 18:54:32
http://reply.papertrans.cn/95/9406/940565/940565_30.png