Patent ID: 11971321
Assignee: RAYTHEON COMPANY
Field: Measurement (Instruments)
Classification: CPC F  G  H | IPC F  G  H

Claim 8:
9. The method of claim 6, wherein removing the reflection of the sun from the field of view of the irradiance spectrometer comprises:
actuating a light baffle to block a first fraction of a mirror area of the mirror target such that the reflection of the sun from the mirror target is blocked from the field of view of the irradiance spectrometer;
with the foreoptics of the irradiance spectrometer pointed directly at the mirror target while the first fraction of the mirror area is blocked, taking a fourth irradiance measurement with the irradiance spectrometer;
actuating a light baffle to block a second fraction, different from the first fraction, of the mirror area of the mirror target such that the reflection of the sun from the mirror target is blocked from the field of view of the irradiance spectrometer;
with the foreoptics of the irradiance spectrometer pointed directly at the mirror target while the second fraction of the mirror area is blocked, taking a fifth irradiance measurement with the irradiance spectrometer; and
extrapolating, with at least one processor, from the fourth and fifth irradiance measurements, to calculate a sixth irradiance that represents a background irradiance from the reflection of the sky from the mirror target and from non-mirror light sources in the field of view of the irradiance spectrometer.