US 12,436,280 B2
Maintaining consistent photodetector sensitivity in an optical measurement system
Sebastian Sorgenfrei, Playa Vista, CA (US); Rong Jin, Acton, MA (US); Ryan Field, Culver City, CA (US); Jacob Dahle, Arlington, MA (US); and Bruno Do Valle, Brighton, MA (US)
Assigned to HI LLC, Culver City, CA (US)
Filed by HI LLC, Los Angeles, CA (US)
Filed on Jul. 30, 2021, as Appl. No. 17/390,624.
Claims priority of provisional application 63/196,926, filed on Jun. 4, 2021.
Claims priority of provisional application 63/064,249, filed on Aug. 11, 2020.
Prior Publication US 2022/0050198 A1, Feb. 17, 2022
Int. Cl. G01S 17/04 (2020.01); A61B 5/00 (2006.01); G01S 7/481 (2006.01); G01S 7/4861 (2020.01); H03M 1/12 (2006.01); H10F 77/00 (2025.01)
CPC G01S 17/04 (2020.01) [G01S 7/4813 (2013.01); G01S 7/4861 (2013.01); H03M 1/12 (2013.01); H10F 77/959 (2025.01); A61B 5/6803 (2013.01); A61B 5/6868 (2013.01)] 18 Claims
OG exemplary drawing
 
1. An optical measurement system comprising:
a light source configured to emit a light pulse directed at a target;
a plurality of photodetectors configured to operate in accordance with an input bias voltage; and
a control circuit configured to:
identify a photodetector subset included in the plurality of photodetectors and that detects, while the input bias voltage has a first value, photons of the light pulse after the light pulse is scattered by the target;
determine, based on the identifying of the photodetector subset, an overvoltage associated with the photodetector subset, the determining the overvoltage comprising measuring a respective overvoltage for each photodetector of the photodetector subset; and
update, based on the overvoltage, the input bias voltage for the plurality of photodetectors to have a second value.