US 12,442,685 B2
Radiometric calibration method and device
Gerard Christiaan Jurjen Otter, Pijnacker (NL); James Peter Robert Day, Berkel en Rodenrijs (NL); Niels Dijkhuizen, Zoetermeer (NL); Ralph Claude Snel, Hilversum (NL); and Marcela Pelica Pascoa, Eindhoven (NL)
Assigned to Nederlandse Organisatie voor toegepast-natuurwetenschappelijk onderzoek TNO, 's-Gravenhage (NL)
Appl. No. 18/265,559
Filed by Nederlandse Organisatie voor toegepast-natuurwetenschappelijk onderzoek TNO, 's-Gravenhage (NL)
PCT Filed Dec. 6, 2021, PCT No. PCT/NL2021/050737
§ 371(c)(1), (2) Date Jun. 6, 2023,
PCT Pub. No. WO2022/124886, PCT Pub. Date Jun. 16, 2022.
Claims priority of application No. 20212239 (EP), filed on Dec. 7, 2020.
Prior Publication US 2024/0027268 A1, Jan. 25, 2024
Int. Cl. G01J 3/02 (2006.01); G01J 1/42 (2006.01)
CPC G01J 3/0297 (2013.01) [G01J 1/42 (2013.01); G01J 3/0205 (2013.01); G01J 2001/4266 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method for making a calibrated measurement of light from an object, the method comprising:
during a first measurement window:
receiving a beam of object light from the object onto a beam splitter causing the object light to be split into a first light beam traveling along a signal path and a second light beam traveling along a reference path,
measuring a first signal by projecting the first light beam via the signal path onto a respective signal detection element, and
measuring a second signal by projecting the second light beam via the reference path onto a respective reference detection element;
during a second measurement window, that is temporally distinct from the first measurement window:
receiving a beam of calibration light onto the beam splitter causing the calibration light to be split into a third light beam traveling along the signal path and a fourth light beam traveling along the reference path,
measuring a third signal by projecting the third light beam via the signal path onto the respective signal detection element, and
measuring a fourth signal, by projecting the fourth light beam via the reference path onto the respective reference detection element; and
determining at least one measurement value of the object light,
wherein the one measurement value is based on at least a combination of the measured first signal, second signal, third signal and fourth signal.