公开(公告)号：US20230132834A1

公开(公告)日：2023-05-04

申请号：US17910988

申请日：2021-03-11

申请人： UNIVERSITEIT GENT ,  IMEC VZW

发明人： Marwan YUSUF ,  Emmeric TANGHE ,  Wout JOSEPH ,  Luc MARTENS

IPC分类号： G01V3/12 ,  G01S13/04

摘要： Example embodiments describe a method for estimating a number of persons present in a room including i) obtaining measurements of electromagnetic sounding signals transmitted within the room; ii) determining at least one reverberation time from the measurements; iii) determining the number of people in the room based on the at least one reverberation time, on a room parameter indicative for a capacity of the room for absorbing the signals and a person parameter indicative for an average capacity of a person for absorbing the signals.

公开(公告)号：US20170234943A1

公开(公告)日：2017-08-17

申请号：US15429555

申请日：2017-02-10

申请人： UNIVERSITEIT GENT

发明人： Arno THIELENS ,  Wout JOSEPH ,  Luc MARTENS

IPC分类号： G01R33/12 ,  G01R29/08

CPC分类号： G01R33/12 ,  G01R29/0892 ,  G01R33/288 ,  G01R35/005

摘要： A method and system for determining a whole-body averaged specific absorption ratio (SARwb) in a person comprises positioning an exposimeter on the person's body and providing a chamber forming an electromagnetic (EM) cavity and comprising a radiofrequency emitter and receiver; determining a first reverberation time of decay of EM power and a free-space incident power density in the chamber when the person is absent, and determining, a second reverberation time of decay of EM power in the chamber and a reference received power, received by the exposimeter, when the person is present in the chamber; and determining an absorption cross section of the person taking the first and second reverberation time and a volume of the chamber into account, determining a calibration factor relating a received power on the exposimeter to the SARwb, measuring a received power using the exposimeter, and determining the SARwb by applying the calibration factor.

公开(公告)号：US20170234915A1

公开(公告)日：2017-08-17

申请号：US15042625

申请日：2016-02-12

申请人： UNIVERSITEIT GENT

发明人： Arno THIELENS ,  Luc MARTENS ,  Wout JOSEPH

IPC分类号： G01R29/08

CPC分类号： G01R29/0878 ,  G01R29/0857

摘要： A method and system for determining a whole-body averaged specific absorption ratio (SARwb) in a person comprises positioning an exposimeter on the person's body and providing a chamber forming an electromagnetic (EM) cavity and comprising a radiofrequency emitter and receiver; determining a first reverberation time of decay of EM power and a free-space incident power density in the chamber when the person is absent, and determining, a second reverberation time of decay of EM power in the chamber and a reference received power, received by the exposimeter, when the person is present in the chamber; and determining an absorption cross section of the person taking the first and second reverberation time and a volume of the chamber into account, determining a calibration factor relating a received power on the exposimeter to the SARwb, measuring a received power using the exposimeter, and determining the SARwb by applying the calibration factor.