Forum Technical Discussions      k factor Posted by: Ed Ginzel    (PID_67), E-mail: Address, on December 15, 2008 at 15:59 : I have been asked how the values for "k" used in the beam divergence equations have been derived. My favourite references of Krautkramer and Ermolov touch on the subject and allude to the use of the Bessel J1(x) function. However, I cannot find the link to the k values for dB drop using this function described in either text. Does anyone have a more complete formulation of the equations to derive k? Follow Ups: Re: k factor James Barshinger 23:02 Dec-15-2008 (6) Re: k factor Neil Burleigh 23:49 Dec-15-2008 (5) Re: k factor Udo Schlengermann 12:06 Dec-16-2008 (4) Re: k factor Ed Ginzel 22:59 Dec-17-2008 (0) Re: k factor S.V.Swamy 07:45 Dec-17-2008 (0) Re: KK factor Joe Buckley 20:29 Dec-16-2008 (1) Re: KK factor Neil Burleigh 23:44 Dec-16-2008 (0) Post a Followup: Name: E-Mail: Subject: Comments: ----------- Start Original Message ----------- : I have been asked how the values for "k" used in the beam divergence equations have been derived. My favourite references of Krautkramer and Ermolov touch on the subject and allude to the use of the Bessel J1(x) function. However, I cannot find the link to the k values for dB drop using this function described in either text. : Does anyone have a more complete formulation of the equations to derive k? ------------ 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