# Can a SQUID perform real time measurements of a slow varying magnetic flux?

It is well known that a SQUID can detect an extremely small magnetic flux.

What if the flux is time-dependent? E.g. a slow varying sinusoidal magnetic flux

$$\Phi=\Phi_0\sin(\omega t).$$

Can I still perform a real time measurement of the slow varying flux considering the induced EMF?

By "slow" I mean $\omega$ is smaller than Josephson frequency (AC Josephson effect due to the EMF).

-

I just had a look at the data - the time frame was 50k seconds (approx. 14 hours) during which the flux changed by 250%. So if your $\omega$ is very very small, it should work - otherwise, I would love to hear your experimental results :) –  Claudius Oct 8 '12 at 18:55