Hi! I'm trying to set-up to measure received power of inductively coupled WPT system for bio-medical application.
I have to use several watts for transmitting power since receiving antenna is super small. So, the area made by oscilloscope probes are much greater than the area made by receiver. The problem is oscilloscope shows few volts even without receiver. If I connect probes (+) & (-) with transmitter on, then few volts show up on oscilloscope screen.
How can I overcome this problem?
If I make EM-wave shielding box, I feel like it would change experimental result due to reflected waves.
I cannot lower the Tx power, while I have to measure Rx power which is much smaller than the power received by probes.
Thank you for reading everyone.
Please help me...
One way to limit inductive coupling with ambient noise is to reduce the effective area of your measurement system. One way to do this is to connect your oscilloscope to your receiving device using twisted cables, so that the effective area tends to vanish.
If your experiment is "clean enough" so that you can calibrate it, another way is to place your oscilloscope cables so that two opposite loops appear (some kind of "8" shape). Then, you can design them so that the flux intercepted by each of them cancels out: You first measure the voltage received by your oscilloscope when the two probes are short-circuited and you place your cable so that the total voltage disappears. Then, without moving your cables and experimental setup, you remove the short-circuit.
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