US 11,982,618 B2
Method of calibrating optical sensor, optical sensor, and apparatus for estimating bio-information
Sung Hyun Nam, Yongin-si (KR); Hyeong Seok Jang, Seoul (KR); and Jin Young Park, Hwaseong-si (KR)
Assigned to SAMSUNG ELECTRONICS CO., LTD., Suwon-si (KR)
Filed by SAMSUNG ELECTRONICS CO., LTD., Suwon-si (KR)
Filed on Oct. 29, 2020, as Appl. No. 17/084,296.
Claims priority of application No. 10-2020-0058975 (KR), filed on May 18, 2020.
Prior Publication US 2021/0356322 A1, Nov. 18, 2021
Int. Cl. G01N 21/47 (2006.01); A61B 5/145 (2006.01); A61B 5/1455 (2006.01); A61B 5/1495 (2006.01); G01J 3/02 (2006.01); G01J 3/10 (2006.01)
CPC G01N 21/4785 (2013.01) [A61B 5/14532 (2013.01); A61B 5/14546 (2013.01); A61B 5/1455 (2013.01); A61B 5/1495 (2013.01); G01J 3/021 (2013.01); G01J 3/0297 (2013.01); G01J 3/10 (2013.01); A61B 2562/0238 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A method of calibrating an optical sensor, the method comprising:
acquiring a first characteristic for an external light source through a detector of the optical sensor while an internal light source of the optical sensor is turned off;
driving the internal light source;
acquiring a second characteristic for the internal light source and the external light source through the detector, based on driving the internal light source;
acquiring a reference characteristic of the internal light source, for calculation of an absorbance of an object, based on the first characteristic and the second characteristic;
comparing the reference characteristic and an initial characteristic; and
determining whether to perform re-measurement, based on comparing the reference characteristic and the initial characteristic,
wherein the acquiring the reference characteristic comprises acquiring the reference characteristic by subtracting the first characteristic from the second characteristic.