Recent development in BTDF/BRDF metrology on large-scale lambertian-like diffusers, application to on-board calibration units in space instrumentation

Mazy, Emmanuel; Michel, C.; Marcotte, Sara; Clermont, Lionel; Marquet, Benoît; Jacobs, Jérôme; Domken, Isabelle; Stockman, Yvan

doi:10.1117/12.2526174

Cited by 1 publication

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“…This is a significant improvement compared to the situation of the theoretical alignment which yields a significant improvement of the BSDF measurement accuracy. For example, in the case of a Lambertian diffuser at θ i =θ s =70°, equation (5) gives that the BSDF relative error would be 0.028% if the error is 14.9'' for both dθ i and dθ s .…”

Section: Performance Resultsmentioning

confidence: 99%

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Performance enhancement of a BSDF test bench using an algorithm fed with laser-tracker measurements

Clermont

Michel

Mazy

2019

Modeling Aspects in Optical Metrology VII

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In the field of earth-observation, on-board calibration is often necessary to guarantee the radiometric accuracy of space instruments. A typical method is to use large diffusers in front of the instrument, illuminated with a reference source like the sun [1]. Hence, it is necessary to characterize the scattering properties of the diffuser with excellent accuracy. Given the large size and weight of the diffusers to characterize, CSL have developed a bench which uses a robot arm to manipulate the sample. For the most stringent applications, the typical accuracy of robotic arms is not good enough to measure the BSDF with a satisfactory accuracy. A method have been developed which uses laser tracker measurements of the sample during a calibration phase and compensate for the robot errors. This paper describes the principle of the method and the results obtained. We also present the model of how the orientation error of the sample affects the BSDF relative error.

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Section: Performance Resultsmentioning

confidence: 99%

“…The detector block rotates around a vertical axis and is meant to measure the scattered light at different angles from incidence direction. The combination of rotation of the detector and robot motion allows measuring S scat for different values of (θ i , Φ i , θ s , Φ s ) [5].…”

Section: Bsdf Bench Descriptionmentioning

confidence: 99%