US 11,940,379 B2
Device for measuring a relative humidity level inside the enclosure of a watch case
Dominique Dubugnon, Saint-Prex (CH); Cédric Blatter, Commugny (CH); and Michel Willemin, Prêles (CH)
Assigned to The Swatch Group Research and Development Ltd, Marin (CH)
Filed by The Swatch Group Research and Development Ltd, Marin (CH)
Filed on Sep. 21, 2021, as Appl. No. 17/480,250.
Claims priority of application No. 20202329 (EP), filed on Oct. 16, 2020.
Prior Publication US 2022/0120677 A1, Apr. 21, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. G01M 3/38 (2006.01); G01N 21/3554 (2014.01); G04D 7/00 (2006.01)
CPC G01N 21/3554 (2013.01) [G04D 7/007 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A device for measuring a relative humidity level inside an enclosure of a case of a watch, the device comprising:
an emitter module provided with a source of light radiation capable of emitting light beams towards the enclosure of said case;
a receiver module for receiving at least one acoustic signal from said enclosure, and
a control unit connected to said modules- and which is configured to evaluate a water vapour content of a gaseous fluid contained inside said enclosure as a function of said at least one acoustic signal received by the receiver module.