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480 views Technical Discussions Hafiz Hafiz 14:31 Aug-22-2009 spatial resolution Dear Experts, I have some queries regarding the ultrasonic resolution. i did some study on ultrasonic transducer. i placed a transmitter & at the other end a receiver probe on the verticle column surface (non-invasive, with couplant) consist of water. my reason is to study/measure the air bubbles velocity released from the bottom of the column. if my freq is 40kHz, and taking v= 1500m/s (water), from v = f*lamda, the wavelength of the sound is 37.5mm. so, what is the minimum bubble size could be detected by the receiver probe? is it equivalent to the wavelength? because i did try smaller than the wavelength (25mm) and the receiver probe still gives the response. thank you                  Reply  Translate  Close   Wieslaw Bicz Engineering, PBP Optel sp. z o.o., Poland, Joined Feb 2009, 247 Wieslaw Bicz Engineering, PBP Optel sp. z o.o., Poland, Joined Feb 2009 247 19:12 Sep-15-2009 Re: spatial resolution In Reply to Hafiz at 14:31 Aug-22-2009 (Opening). The detection of single bubbles has nothing to do with resolution. This would be the case, if you would be interested in differentiation between two bubbles situated close to each other. In you case the question will be: how strong is the signal reflected by the bubble and what is the sensitivity of your probe and electronics. The wave length is not significant in this case. It can be much larger than the bubble size.                  Reply  Translate  Close   Product Spotlight Swift & Scorpion2 - a state-of-the-art remote-control ultrasonic crawler StandSilverwing The Swift and Scorpion2 dry-coupled, remote-access ultrasonic crawler bring major efficiency and d ... ata improvements to tank shell inspections and other structures such as vessels and offshore installations. > 4 Showcases4 Videos I&T Nardoni StandI&T Nardoni Institute NDT, RESEARCH AND DEVELOPMENT OF NEW METHODOLOGY, TRAINING CENTER I&T NARDON INSTITUTE was idiated ... in 1988 by Giuseppe Nardoni, now president and owner of the company, based on his multi-annual and international experience in the field of NDT. > Panther StandEddyfi Technologies / M2M M2M PANTHER is a phased-array equipment designed for both desktop and industrial applications, offer ... ing unparalleled performance in a compact unit. It combines the speed required for industrial integrated Phased-Array Ultrasound (PAUT) solutions, with the most complete set of total focusing method (TFM) imaging techniques, making it the ultimate tool for R&D and procedure qualification. > 5 Showcases5 Videos PROlineTOP Plug & Play Ultrasonic inspection device StandVOGT Ultrasonics GmbH As Plug & Play solution it units all control and operation elements in a small housing and therefo ... re replaces the typical control cabinet... > 3 Showcases more Showcases Share... Home Exhibition Archive Forum Jobs Members Events Directory NDT A-Z Advertise Privacy Policy Contact About © NDT.net - Where expertise comes together. The Largest Open Access Portal of Nondestructive Testing (NDT)- since 1996 We use technical and analytics cookies to ensure that we will give you the best experience of our website - More Info Accept top this is debug window