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:
Nov. 23, 2021
Filed:
Jun. 08, 2017
Cambridge Enterprise Limited, Cambridge, GB;
Ashwin Seshia, Cambridge, GB;
Xudong Zou, Cambridge, GB;
Cambridge Enterprise Limited, Cambridge, GB;
Abstract
A gravimeter or inertial sensor system and method of operating such a system is provided. The system comprises a variable frequency signal source () configured to provide first and second signals, a resonant sensor () connected to receive the first signal, a phase comparator () connected to the output of the resonant sensor and to receive the second signal, and a controller () connected to the phase comparator. In a first mode, the controller controls the desired frequency of the signals from the variable frequency signal source based on a value of the phase comparator output signal to lock the frequency of the input signals to a resonant frequency of the resonant sensor. In a second mode, the controller disconnects from the variable frequency signal source and records an open loop output signal indicative of the physical parameter to be measured based on the response of the resonant sensor.