Forum Technical Discussions      Re: killing rate(PRF) in automated ut Posted by: Ed Ginzel    (PID_67), E-mail: Address, on September 16, 2008 at 18:45 : In Reply to: killing rate(PRF) in automated ut posted by : Anderson , E-mail: Address, on September 16, 2008 at 02:29 : Anderson: I have never heard of PRF being called "killing rate" where is this term from? PRF or pulse-repetition-frequency can have several meanings now that we have multi-channel and phased array systems. In the old single channel units it was simply the number of times the probe was pulsed per second. When we added multiple probes in a multiplexed system the pulse was initiated by a trigger so the system clock then had to move from channel to channel, triggering each in turn. That meant that the "prf" set by the system clock was not the same as the pulse repetition frequency of each probe but was instead the clock rate. But there are variations on this too. When averaging is used there may be multiple firings of the same probe (for one channel) before the next probe is addressed. Again in this case, the system clock rate would be considered the "prf" in the older technology. In phased array systems the system clock rate "generally" initiates a focal law which is composed of several pulsers firing elements in close order. Different manufacturers now have different terms for the sequencing of the pulses (acquisition rate, recurance rate, cascade rate, etc.). For the specifics of any one system and how it works you may want to discuss the specifications with the manufacturer. Regards Ed ----------- Start Original Message ----------- : Hi everybody. I would like to know some information about killing rate or firing rate (PRF) related to A-Scan automated ut. Could someone help me? : Thanks. ------------ End Original Message ------------ Follow Ups: Post a Followup: Name: E-Mail: Subject: Comments: ----------- Start Original Message ----------- : Anderson: : I have never heard of PRF being called "killing rate" where is this term from? : PRF or pulse-repetition-frequency can have several meanings now that we have multi-channel and phased array systems. : In the old single channel units it was simply the number of times the probe was pulsed per second. : When we added multiple probes in a multiplexed system the pulse was initiated by a trigger so the system clock then had to move from channel to channel, triggering each in turn. That meant that the "prf" set by the system clock was not the same as the pulse repetition frequency of each probe but was instead the clock rate. But there are variations on this too. When averaging is used there may be multiple firings of the same probe (for one channel) before the next probe is addressed. Again in this case, the system clock rate would be considered the "prf" in the older technology. In phased array systems the system clock rate "generally" initiates a focal law which is composed of several pulsers firing elements in close order. : Different manufacturers now have different terms for the sequencing of the pulses (acquisition rate, recurance rate, cascade rate, etc.). For the specifics of any one system and how it works you may want to discuss the specifications with the manufacturer. : Regards : Ed : : : Hi everybody. I would like to know some information about killing rate or firing rate (PRF) related to A-Scan automated ut. Could someone help me? : : Thanks. ------------ 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