The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 25, 2016
Filed:
Nov. 14, 2011
Antonio Orozco, Washington, DC (US);
Vladimir V. Talanov, Ellicott City, MD (US);
Alfred Benjamin Cawthorne, Iii, Franklin, TN (US);
Nesco Mario Lettsome, Jr., Beltsville, MD (US);
Antonio Orozco, Washington, DC (US);
Vladimir V. Talanov, Ellicott City, MD (US);
Alfred Benjamin Cawthorne, III, Franklin, TN (US);
Nesco Mario Lettsome, Jr., Beltsville, MD (US);
Neocera, LLC, Beltsville, MD (US);
Abstract
An RF DC SQUID based magnetometer capable of sensing coherent magnetic fields up to 200 MHz and higher is developed which overcomes frequency limitations associated with noise signals due to transmission line delays between the SQUID circuit and readout electronics. The bandwidth limitations are overcome by superimposing the RF flux on the modulation flux to produce at the SQUID output a binary phase modulated RF voltage, which is processed to lock the static flux, and to control modulation regime by producing an AC bias for the RF flux. RF readout electronics based on a double lock-in technique (sequential demodulation of the RF SQUID voltage at the modulation flux frequency ωand the RF flux frequency ω), yields a signal proportional to the product of amplitude and phase cosine of RF flux with linear dynamic range up to five orders in magnitude if compared to DC SQUID operated in traditional flux-locked loop regime.