Recent content by fuzzychaos

Hi Bob, Looks like I need to get a different sensor in the future. This is reply that I got from Fluke. The device includes a photodiode (anode and a resistor connected to center pin) and a shunt resistance of about a megohm. This device is intensity dependant and reasonably accurate for...

Hi Bob, I read through the whole beam monitoring paper, thanks for the link. Unfortunately the manual for the detector is very basic and doesn't show or explain any of the technical details that you are asking about. I'll check with Fluke again, last time they didn't answer me. The...

Hi Bob, I've been reading up a bit to try and better understand what you are saying. Can I use the average Bremsstrahlung calculated for a certain beam angle and then decay it by the distance and angle traveled to the detector to get my actual output? Most of the Math that I've come...

Hi Bob, Thanks for the useful pages on the current measurements. The previous engineer left me a similar picture (attached) to the rabbit ear one that you describe. With the appropriate cross-section that is exactly what you are describing. Thanks for the GEANT4 equation reference, I'll...

Hi Bob, Thanks, this is helping. I'm a bit unsure about manufacturing my own transimpedance amplifier, let alone 2 that are balanced, it doesn't sound easy to do this properly. However let me keep at this and see what I can find. I'll get a shorter recommended type of cable, the RG-58u...

Hi Bob, Thanks for the help and for the application assistance. I appreciate your patience and I just want to check my understanding of what you just said. I see the transimpedance amplifiers are used for current to voltage applications right, so when you say measure the current directly...

Hi Bob, Thanks for checking it out and following up. We are using a Beryllium window that has one side coated with Tungsten. The thickness changes only because I have a Tungsten ring attached (of a certain thickness and width) covering the rim of the window. Yes there is filtering and...

Hi Bob, 1) I found the log response in the manual, it says that low input impedance is linear but 10MOhm input impedance is logarithmic (mine is 1GOhm). I didn't look up in any electronics manual why that would be so. Section 1.2 pg 5 of http://assets.fluke.com/manuals/07_451__omeng0000.pdf...

Hi, Hopefully I'm posting this in the correct forum. I'm using Nuclear Associates 07-451 flux detector with a gigaohm input impedance such that the measurement read is logarithmically compressed. The x-ray tube is outputting a constant number of rads. The flux sensor is mounted to the...