Communicating with an implanted wireless sensor

A - Human Necessities – 61 – B

Patent

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A61B 5/00 (2006.01)

Patent

CA 2645770

Aspects of the present invention determine the resonant frequency of a sensor by obtain sensor signals in response to three energizing signals, measure the phase of each sensor signal, and using a group phase delay to determine the resonant frequency. The phase difference between the first and second signal is determined as a first group phase delay. The phase difference between the second and third signal is determined as a second group phase delay. The first group phase delay and second group phase delay are compared. Based on the comparison, the system may lock on the resonant frequency of the sensor or adjust a subsequent set of three energizing signals.

L'invention par certains aspects détermine la fréquence de résonnance d'un détecteur: en obtenant du détecteur un signal en réponse à trois signaux d'excitation; en mesurant la phase de chacun des signaux du détecteur; et en utilisant un retard de phase de groupe. La différence de phase entre le premier signal et le deuxième signal représente un premier retard de phase de groupe. La différence de phase entre le deuxième signal et le troisième signal représente un deuxième retard de phase de groupe. On compare les deux retards de phase, et sur la base de la comparaison, le système peut verrouiller la fréquence de résonnance du détecteur ou ajuster un nouvel ensemble de trois

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