ma826
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Posts: 3
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Post by ma826 on Mar 11, 2018 20:52:59 GMT -5
Hi All,
We are working on wireless inductive transfer charging pads and one of our goals is to measure temperature of Litz wire coil buried into the sand and concrete (so we cannot see the coil) during experimental tests (which is under high electromagnetic filed). We are just wandering if you can introduce a proper temperature sensor in order to measure temperature of electromagnetic pads(the maximum temperature is 130 degree).
Thanks
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Post by Lake Shore Ryan on Mar 12, 2018 9:40:01 GMT -5
Hi,
What field strength values would you be expecting for the sensor? And what is your desired temperature accuracy for this measurement. I just want to check too, is the maximum temperature in Celsius?
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ma826
New Member
Posts: 3
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Post by ma826 on Mar 12, 2018 16:17:07 GMT -5
Thank you for the prompt reply,
the frequency is 85 KHz and the temperature accuracy shouldn't be more that 2 degree. I 'd say , yes the temperature is in Celsius.
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Post by Lake Shore Ryan on Mar 12, 2018 17:29:33 GMT -5
Well, at that temperature range and accuracy level, you'd have a lot of different options. The problem you might run into for most of these sensors will be inductive pickup in your temperature measurement leads, since most of these rely on a generated voltage value to determine temperature. Our Model 372 combined with a platinum RTD might be a solution due to its balanced current source that can reject environmental noise. However, I worry that even the 372 might not be able to reject a signal large enough to accomplish inductive charging. You might want to look for something based on fiber-optics that won’t be affected by the large EM field. I found the FOB100 from Omega. This might be a good place to start. It also has a smaller price tag than our Model 372. If you can, let me know what you end up trying. I’m curious to know what solution you end up with. |
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ma826
New Member
Posts: 3
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Post by ma826 on Mar 13, 2018 16:47:01 GMT -5
Thank you.
Generally the magnetic field should be below 600mT (that's the saturation point for very good ferrites). Typical ferrite saturates at about 300~400mT.
At the moment, I'm thinking that the future 3D printed enclosures will integrate the sensors in them so that the sensors have good connection with some portion of Litz wire and ferrite.
For their purposes, we you expect to use it on a flat surface.
How much are these things by the way for fiber-optic sensor?
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Post by Lake Shore Ryan on Apr 9, 2018 13:24:28 GMT -5
Sorry, I missed your last post. I provided a link in my last post for the fiber-optic instrument. If you click on "FOB100" in that post it will take you to Omega's website where you can see pricing.
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