Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1975-10-31
1977-01-18
Corcoran, Robert J.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
307306, 323 44F, G01R 3302
Patent
active
040042170
ABSTRACT:
A flux locked loop, employing a squid in connection with the production of the locked-loop error signal, includes circuitry which renders the locked loop more immune to disturbance inputs such as a ground-loop noise and interference transients and which facilitates a scale factor adjustment of a sub-carrier drive signal for the squid. To minimize ground-loop noise disturbance effects, a portion of the circuitry in the feedback path of the locked loop includes a voltage-responsive converter circuit arrangement providing a current-drive feedback signal for coupling to the squid. To minimize interference transient disturbance effects, a portion of the circuitry in the forward path of the locked loop includes a circuit arrangement having a non-linear transfer characteristic defining opposed substantial attenuation regions separated by a generally linear gain region. To facilitate adjustment of the scale factor to a desired value, a portion of the circuitry provides for an open-loop operation in which a test-mode oscillating signal is coupled to the squid along with an operating-mode modulation drive signal. This causes a heterodyning process to take place such that the frequency spectrum of the electrical signal does not contain frequency components at or near the frequency of the test-mode oscillating signal under circumstances in which the modulation drive signal has been adjusted to the desired value.
REFERENCES:
forgacs et al., Lock-On Magnetometer Utilizing a Superconducting Sensor, IEEE Trans on Inst., vol. 11-15; No. 3 Sept. 1966 pp. 113-120.
Silver et al., Quantum States & Transition in Weak Connected Superconducting Rings, Phys. Rev., vol. 157, No. 2, May 10, 1967, pp. 317-341.
Corcoran Robert J.
S.H.E. Corporation
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