US 12,085,789 B2
Bias voltage generation in an optical measurement system
Ryan Field, Culver City, CA (US); Jacob Dahle, Arlington, MA (US); Rong Jin, Acton, MA (US); Alex Borisevich, Los Angeles, CA (US); Sebastian Sorgenfrei, Playa Vista, CA (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 Mar. 16, 2021, as Appl. No. 17/202,613.
Claims priority of provisional application 63/057,080, filed on Jul. 27, 2020.
Claims priority of provisional application 62/992,510, filed on Mar. 20, 2020.
Prior Publication US 2021/0294129 A1, Sep. 23, 2021
Int. Cl. G02F 1/01 (2006.01); A61B 5/00 (2006.01); G01J 1/42 (2006.01); G01J 1/44 (2006.01); H04B 10/50 (2013.01)
CPC G02F 1/0123 (2013.01) [A61B 5/0075 (2013.01); G01J 1/4228 (2013.01); G01J 1/44 (2013.01); H04B 10/50575 (2013.01); A61B 5/0042 (2013.01); A61B 2562/0238 (2013.01); G01J 2001/442 (2013.01); G01J 2001/4466 (2013.01); G01J 2001/448 (2013.01)] 22 Claims
OG exemplary drawing
 
1. An optical measurement system comprising:
a control circuit configured to output a global bias voltage; and
a module communicatively coupled to the control circuit, the module comprising:
a light source configured to emit light directed at a target,
a plurality of detectors configured to detect arrival times for photons of the light after the light is scattered by the target, and
a module control circuit configured to:
receive the global bias voltage,
output a plurality of detector bias voltages based on the global bias voltage and including a respective detector bias voltage for each detector of the plurality of detectors, wherein the global bias voltage is a voltage level higher than the plurality of detector bias voltages and the outputting the plurality of detector bias voltages comprises stepping down the global bias voltage for each respective detector bias voltage;
monitor the plurality of detector bias voltages; and
adjust, based on a highest voltage level of the plurality of detector bias voltages, the global bias voltage.