Brian Schiffer, San Francisco, CA; Tushar Parlikar, Somerville, MA; and Brian Ward Guilardi, San Jose, CA.
Assigned to Verily Life Sciences LLC South San Francisco, CA.

Filed: 4/12/19
Issued: 6/20/23

A method for predicting a loading of an absorbent article, the method comprising: obtaining a first measurement of ambient light received from a photodetector while a light source is off; obtaining a second measurement from the photodetector while the light source is transmitting light, the second measurement comprising a measurement of the ambient light and the transmitted light reflected from the absorbent article; determining a normalized measurement of light reflected from an absorbent article by removing an ambient light signal from the second measurement based on the first measurement of ambient light; determining, from the normalized measurement of light, a presence of urine in the absorbent article; determining, from a time series of data including an inertial measurement for each of a set of time periods, an activity state of an infant wearing the absorbent article; and determining a degree of fullness of the absorbent article, wherein the determining is based on (i) an elapsed time since the determination of the presence of urine and (ii) the activity state.