Coil magnetic field measurement
Coil magnetic field measurement
(OP)
Hi, I would like to have some suggestions for solenoid valve magnetic field measurement.
Some specifications: sensor diameter must be smaller than 14mm but <6mm preferred.
Accuracy: min. 0,1 % (max. field about 100 mT)
Frequency max. 7 KHz
NMR sensors are too big, fluxgates haven't got the bandwidth and hall elements and GMR sensors cannot fulfill the accuracy criteria. SQUID and SERF do not even come in question.
Anyone has got any ideas?
Thank you!
Some specifications: sensor diameter must be smaller than 14mm but <6mm preferred.
Accuracy: min. 0,1 % (max. field about 100 mT)
Frequency max. 7 KHz
NMR sensors are too big, fluxgates haven't got the bandwidth and hall elements and GMR sensors cannot fulfill the accuracy criteria. SQUID and SERF do not even come in question.
Anyone has got any ideas?
Thank you!





RE: Coil magnetic field measurement
Senis Transducer Brochure (pdf)
RE: Coil magnetic field measurement
TTFN
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RE: Coil magnetic field measurement
RE: Coil magnetic field measurement
@ VE1BLL: Senis seems ok, I am looking for a cheaper alternative. I found this: http://www.hoeben.com/productdata/Datasheet-HE144-...
As far as I see it, Watt Balance is for mass measurements.
@IRstuff: The problem really has high criteria, they might be lowered if there was no solution.
RE: Coil magnetic field measurement
RE: Coil magnetic field measurement
Your cited Hall effect device appears to net out at about 0.5%, when you account for all the parasitic effects, like temperature, Joule heating, nonlinearity, etc.
TTFN
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RE: Coil magnetic field measurement
Which cited Hall Sensor are you referring to? Please note, that the temperature coefficient of the offset can be mostly compensated by the HE 144 Sensor.
RE: Coil magnetic field measurement
They use clever techniques to eliminate unknowns. It's those clever techniques that I was intending to point to with my mention of the topic. Basically, that 10-8 makes "0.1%" look pretty easy in comparison.
RE: Coil magnetic field measurement
TTFN
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RE: Coil magnetic field measurement
Well, the solenoid drives an analog electromechanical valve with really small movements.
RE: Coil magnetic field measurement
http://www.nordson.com/en-us/divisions/asymtek/Lit...
TTFN
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RE: Coil magnetic field measurement
As a summary my thoughts are:
Now I would like to choose between 2 options. There is the Hoeben Sensor, that I have linked before. This sensor is mounted on a circuit. The accuracy is a bit higher than 0,1%, as ohmic offset voltage / temperature can be corrected.(There is a manual for it on the website.) There are also the parasitic effects, IRstuff mentioned before.
The other option is a calibrated probe with a total accuracy of 0,1%. The link: http://www.senis.ch/docs/default-source/datasheet-...
Here I do not have to build a circuit, therefore the total accuracy may be better as in case 1.
RE: Coil magnetic field measurement
Gunnar Englund
www.gke.org
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Half full - Half empty? I don't mind. It's what in it that counts.
RE: Coil magnetic field measurement