Forum Technical Discussions      Re: k factor Posted by: S.V.Swamy (PID_839), E-mail: Address, on December 17, 2008 at 07:45 : In Reply to: Re: k factor posted by : Udo Schlengermann , E-mail: Address, on December 16, 2008 at 12:06 : Sir, You wrote: As everything has been said by my former collegues, I take the chance to wish everyboby : a Merry Christmas and a Prosperous New Year. : Best regards : Udo Schlengermann : Chairman ISO/TC135/SC3 (UT) : Chairman CEN/TC138/WG2 (UT) I too take this opportunity to wish you a happy new year. I tried to mail you separately but the mail was rejected. With best wishes, Swamy Hyderabad, India ndtguru@gmail.com ----------- Start Original Message ----------- : Reply: : Hello Ed, Jim and Neil, : the explanations for the derivation of the k factor of sound beam divergence are correct. : The pulse-echo technique has to take into account the characteristics of both the transmitting and the receiving transducer. : With equal transducers and with the logarithmic decibel-notation it simply means half the dB-drop as for free radiation. : For circular sources Bessels function J1(x)/x has to be used. : For rectangular sources it is the function sin(x)/x for one direction and sin(y)/y for the perpendicular direction. : Unfortunately neither Krautkramer's blue pocket book nor Krautkramer's red book on ultrasonic materials testing are available anymore. : As everything has been said by my former collegues, I take the chance to wish everyboby : a Merry Christmas and a Prosperous New Year. : Best regards : Udo Schlengermann : Chairman ISO/TC135/SC3 (UT) : Chairman CEN/TC138/WG2 (UT) Follow Ups: Post a Followup: Name: E-Mail: Subject: Comments: ----------- Start Original Message ----------- : Sir, : You wrote: : As everything has been said by my former collegues, I take the chance to wish everyboby : : a Merry Christmas and a Prosperous New Year. : : Best regards : : Udo Schlengermann : : Chairman ISO/TC135/SC3 (UT) : : Chairman CEN/TC138/WG2 (UT) : I too take this opportunity to wish you a happy new year. I tried to mail you separately but the mail was rejected. : With best wishes, : Swamy : Hyderabad, India : ndtguru@gmail.com : : Reply: : : Hello Ed, Jim and Neil, : : the explanations for the derivation of the k factor of sound beam divergence are correct. : : The pulse-echo technique has to take into account the characteristics of both the transmitting and the receiving transducer. : : With equal transducers and with the logarithmic decibel-notation it simply means half the dB-drop as for free radiation. : : For circular sources Bessels function J1(x)/x has to be used. : : For rectangular sources it is the function sin(x)/x for one direction and sin(y)/y for the perpendicular direction. : : Unfortunately neither Krautkramer's blue pocket book nor Krautkramer's red book on ultrasonic materials testing are available anymore. : : As everything has been said by my former collegues, I take the chance to wish everyboby : : a Merry Christmas and a Prosperous New Year. : : Best regards : : Udo Schlengermann : : Chairman ISO/TC135/SC3 (UT) : : Chairman CEN/TC138/WG2 (UT) ------------ 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