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This is a duplicate of a post I made on Eric's PI forum.
I am starting to seriously think about doing a PI project. But I need some numbers that I have just been guessing at so far.
I would like to know about the dynamic range of signals and signal to noise ratio. For example, I would like to know what the signal strength is for coin sized targets next to the coil, and the strength of the weakest recognizable signal from a distant coin, and the strength of the background noise.
I realize that these numbers depend on a lot of things, but I am interested in ratios, so a lot of the variables cancel out. I would like to know what these levels are at the input to the amplifier. That might be difficult to measure, so the levels at the output of the amplifier are ok as long at the gain is known and there is no AGC. The levels at the output of the integrator are not as useful because much of the noise has been filtered out by then. The more that I know about the conditions behind these numbers the more useful they will be.
If anyone has been working on a PI recently and has these numbers handy I would like to hear them.
Robert
I am starting to seriously think about doing a PI project. But I need some numbers that I have just been guessing at so far.
I would like to know about the dynamic range of signals and signal to noise ratio. For example, I would like to know what the signal strength is for coin sized targets next to the coil, and the strength of the weakest recognizable signal from a distant coin, and the strength of the background noise.
I realize that these numbers depend on a lot of things, but I am interested in ratios, so a lot of the variables cancel out. I would like to know what these levels are at the input to the amplifier. That might be difficult to measure, so the levels at the output of the amplifier are ok as long at the gain is known and there is no AGC. The levels at the output of the integrator are not as useful because much of the noise has been filtered out by then. The more that I know about the conditions behind these numbers the more useful they will be.
If anyone has been working on a PI recently and has these numbers handy I would like to hear them.
Robert
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