Forum Technical Discussions      Re: calibration Posted by: Tom Nelligan    (PID_139), E-mail: Address, on November 18, 2008 at 17:18 : In Reply to: calibration posted by : LANRE ALAPINI , E-mail: Address, on November 18, 2008 at 16:49 : Yes, there will normally be a very significant difference in the zero offset calibration between a single element contact transducer and a dual element transducer of similar frequency and diameter. In the case of a dual, you have to zero out the pulse transit time through the internal delay line, while with a contact transducer you are zeroing out only a very thin wearplate. (Other minor factors like cable length and instrument switching delays wouldn't normally vary with transducer type.) Material sound velocity is of course independent of tranducer type. ----------- Start Original Message ----------- : this kind of question could be could there be any diferent between the calibration of a single element transducer and dual element transducer ------------ End Original Message ------------ Follow Ups: Post a Followup: Name: E-Mail: Subject: Comments: ----------- Start Original Message ----------- : Yes, there will normally be a very significant difference in the zero offset calibration between a single element contact transducer and a dual element transducer of similar frequency and diameter. In the case of a dual, you have to zero out the pulse transit time through the internal delay line, while with a contact transducer you are zeroing out only a very thin wearplate. (Other minor factors like cable length and instrument switching delays wouldn't normally vary with transducer type.) : Material sound velocity is of course independent of tranducer type. : : : this kind of question could be could there be any diferent between the calibration of a single element transducer and dual element transducer ------------ End Original Message ------------ Optional Link URL: Example: "http://www....html". Alternative write "http://www.ndt.net/wshop/attach/filename.htm" if you transfered a filename.htm via FTP Page Title: is important! Optional Image URL: http://www....gif Attention! Please click the button only once. This may take a moment to process Forum Technical Discussions Help