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I am starting this thread to provide a place to discuss and collect data concerning target TC. There seems to be a lack of specific data available concerning the subject. There are a lot of generalities though. I believe I understand the reason for this and it should be born out as data from different contributors is collected and collated.
I believe as we collect data that we will find that specific target TC’s are going to vary all over the map. The reason for this is probably the specific MD parameters/specifications (coil inductance, maximum coil current, MOSFET breakdown voltage, PW, repetition rate, etc) as much as composition, shape, and size of the target itself. This variance should be the result skin effect exhibited by the eddy currents as the frequency range of the di/dt changes (i.e. a fast coil fast decay will create a greater skin effect in the target eddies than a slower coil with a longer decay). As the skin effect increases the target TC should decrease.
So that being said, as we collect and measure data, we should also qualify the measurements with the MD characteristics. I would recommend that we create a list of ‘standard’ targets to gain some sort of consistency. Also it would be desirable to eliminate the distortion/extending of the decay that can be caused by the effective bandpass of the RX.
Presently I am on vacation to the NC coast and will return after the 1st. I will the start tabulating measurements in conjunction with my PI testing/design efforts.
I believe this exercise should be enlightening.
Regards,
J. L. King
I believe as we collect data that we will find that specific target TC’s are going to vary all over the map. The reason for this is probably the specific MD parameters/specifications (coil inductance, maximum coil current, MOSFET breakdown voltage, PW, repetition rate, etc) as much as composition, shape, and size of the target itself. This variance should be the result skin effect exhibited by the eddy currents as the frequency range of the di/dt changes (i.e. a fast coil fast decay will create a greater skin effect in the target eddies than a slower coil with a longer decay). As the skin effect increases the target TC should decrease.
So that being said, as we collect and measure data, we should also qualify the measurements with the MD characteristics. I would recommend that we create a list of ‘standard’ targets to gain some sort of consistency. Also it would be desirable to eliminate the distortion/extending of the decay that can be caused by the effective bandpass of the RX.
Presently I am on vacation to the NC coast and will return after the 1st. I will the start tabulating measurements in conjunction with my PI testing/design efforts.
I believe this exercise should be enlightening.
Regards,
J. L. King