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Flux Locked Loop Circuit for SQUID magnetometer

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kehindekenneth

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I am interested in designing and constructing a Flux Locked Loop Circuit for SQUID magnetometer. I have purchased the SQUID sensor, but I need the FLL circuit to use the SQUID. Can anyone help me out please? The following are the SQUID specifications:

Typical critical current 2Ic: 50µA
Squid resistance R/2:3 Ohms
Feedbak mutual inductance 1/Mf: 17µA/Φ0
Voltage swing ΔV: 30µV
Field calibration: 33 nT/Φ0
Temp Coeff at 77K: 2.5 nt/K

I hope the information provide is adequate to help me out.
 
SQUID magnetometers are run at very cold temperature. Can you keep the coil below 80Kelvin?
 
I purchased the 77K SQUID. I have improvised for how to keep it cooled to 77K. I just need the FLL circuit now. Can you help me out?
 
The information in the link provided is very helpful, but I actually need to operate the SQUID and the FLL without the use of the Mr. SQUID electronics box. I don't know how possible it is. I need to modulate and bias d squid with my own simple elctronic circuit. Is there any further help to that? Thanks for your useful information.
 
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