US 12,031,809 B2
System and method for detecting a wave occurring in/on a membrane
Antti Kontiola, Helsinki (FI); Ari Salmi, Helsinki (FI); Risto Montonen, Helsinki (FI); and Edward Haeggström, Helsinki (FI)
Assigned to PHOTONO OY, Helsinki (FI)
Appl. No. 17/430,046
Filed by PHOTONO OY, Helsinki (FI)
PCT Filed Feb. 25, 2020, PCT No. PCT/FI2020/050069
§ 371(c)(1), (2) Date Aug. 11, 2021,
PCT Pub. No. WO2020/165495, PCT Pub. Date Aug. 20, 2020.
Claims priority of application No. 20195098 (FI), filed on Feb. 12, 2019.
Prior Publication US 2022/0113125 A1, Apr. 14, 2022
Int. Cl. G01B 11/06 (2006.01); A61B 3/10 (2006.01); G01H 9/00 (2006.01); A61B 3/16 (2006.01); A61B 5/00 (2006.01)
CPC G01B 11/06 (2013.01) [A61B 3/1005 (2013.01); G01H 9/00 (2013.01); A61B 3/165 (2013.01); A61B 5/0095 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A system for detecting a wave occurring in/on a membrane, the system comprising:
a source for directing a signal to the membrane, and
a receiver for measuring interference between a first part of the signal reflected off a front surface of the membrane and a second part of the signal reflected off a rear surface of the membrane,
wherein the source and the receiver are positioned obliquely with respect to each other so that the signal is directed obliquely to the membrane when the receiver receives the reflected first and second parts of the signal, and the system comprises a processing device for detecting the wave based on a change in the measured interference.