US 11,754,394 B2
Systems and methods for measuring the rate of angular displacement using magnetic field sensing
Apoorva Murarka, Cambridge, MA (US); and Dev Chandan Behera, Odisha (IN)
Assigned to SEEHOW PTE. LTD., Singapore (SG)
Filed by SeeHow Pte. Ltd., Singapore (SG)
Filed on Aug. 21, 2020, as Appl. No. 16/999,707.
Claims priority of provisional application 62/889,565, filed on Aug. 21, 2019.
Prior Publication US 2021/0055107 A1, Feb. 25, 2021
Int. Cl. G01C 19/24 (2006.01); G01P 15/14 (2013.01)
CPC G01C 19/24 (2013.01) [G01P 15/14 (2013.01); B81B 2201/0235 (2013.01); B81B 2201/0242 (2013.01)] 21 Claims
OG exemplary drawing
 
1. A method for measuring the rate of angular displacement of a traveling object about one or more axes orthogonal to one another using magnetic field sensing, the method comprising: measuring magnetic field intensity and/or changes in the magnetic field intensity, projected onto a magnetic field sensor coupled to the traveling object, to generate scalar measurements over a time duration of the magnetic field intensity and/or changes in the magnetic field intensity, wherein each of the scalar measurements corresponds to one of the orthogonal axes; providing noise-immunity in the measurements with a comparator; determining, with a processor, a number of peaks in the measurements for the time duration, wherein the number of peaks is determined from determining regions where the measurements have a zero slope for the time duration; and computing the rate of angular displacement for the traveling object, as a function of the determined number of peaks and the time duration.