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:
Sep. 05, 2023
Filed:
Jul. 17, 2020
Hrl Laboratories, Llc, Malibu, CA (US);
Randall L. Kubena, Oak Park, CA (US);
Logan D. Sorenson, Thousand Oaks, CA (US);
HRL LABORATORIES, LLC, Malibu, CA (US);
Abstract
A method and apparatus for for sensing a change in an acceleration gradient δa(t) between two gravity fields a(t) and a(t) respectively sensed by the first and second proof masses, the first and second proof masses either being coupled only to a first resonator or being individually coupled to first and second resonators, the first resonator generating, in use, a signal at a frequency fwhich is applied said second resonator, the second resonator being driven, in use, into a non-linear state corresponding to a modal resonant frequency fwherein it generates a comb of frequencies each tooth of which is separated from each other by a frequency Δ which is frequency-wise proportional a frequency difference between fand fand also proportional to the change in said acceleration gradient δa(t), circuitry for selecting an ntooth in said comb of frequencies where the frequency of the ntooth is equal to f+nΔ, circuitry for detecting a change in the frequency of the ntooth and for generating a signal that is proportional to n times the change in an acceleration gradient δa(t).