Calibration procedures and measurement results of a fast semihemispherical spectroradiometer in VIS and NIR

Hahlweg, Cornelius; Rothe, Hendrik

doi:10.1117/12.555902

Cited by 3 publications

(7 citation statements)

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“…The rather complex calibration methods for the radiometrical and mechanical parameters have been described in detail in a corresponding paper. 8 Further refinements end extensions are planned. Especially, for the short wavelength range fluorescence effects are to be taken into account, which leads to the need for a synchronized filter set on the sensor side.…”

Section: Conclusion / Outlookmentioning

confidence: 99%

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Design of a semihemispherical spectroradiometer for fast acquisition of BRDF libraries in VIS and NIR

Hahlweg

Rothe

2004

SPIE Proceedings

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For the fast acquisition of large amounts of BRDF data over wavelength to be compiled into libraries, a small, fast and rugged spectro-radiometer without moving parts for angular resolution is being developed. The system consists of an elliptical mirror which maps a semi-hemisphere onto a CMOS-detector with a dynamic range of 140dB. The detector has 32887 pixels which are calibrated radiometrically in the range from 10 -5 W/m² to 100 W/m² (7 decades). The system can take 30 semi-hemispherical BRDFs per second, i.e. nearly 1 million solid angles per wavelength per second. The smallest illumination spot has an area of 0.03mm², for spatial averaging the sample is mounted on x-y-stages, so the largest avaraged spot can be about 50.000 mm². Incoherent illumination is provided by a set of assorted LED´s. The paper deals with the instrument design, and gives some measurement results.

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Section: Conclusion / Outlookmentioning

confidence: 99%

“…The latter is described in detail in a corresponding paper. 8 After the averaging over all scan steps at one wavelength the data is compiled into 3D data structures for further calculations, data extraction etc.…”

Section: Data Processingmentioning

confidence: 99%

Design of a semihemispherical spectroradiometer for fast acquisition of BRDF libraries in VIS and NIR

Hahlweg

Rothe

2004

SPIE Proceedings

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“…For illumination in the SWIR range an assorted set of narrowband LEDs is chosen 8,9,10,11 . To reach a homogeneous illumination spot of well defined diameter the image of an aperture plate is projected onto the sample using a simple optical system according to 8,9,10,11 .…”

Section: Light Sourcesmentioning

confidence: 99%

“…To reach a homogeneous illumination spot of well defined diameter the image of an aperture plate is projected onto the sample using a simple optical system according to 8,9,10,11 . Since the image of the aperture is located on the scattering sample, the existence of an image of the the point-like source outside the spot along the optical axis of the illumination system is implied.…”

Section: Light Sourcesmentioning

confidence: 99%

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Hemispherical radiometer for angle resolved measurement of IR scatter and radiation behaviour

Hahlweg

Rothe

2006

SPIE Proceedings

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For certain applications the angular distribution of IR radiation from materials and surfaces could be interesting. Various cases have to be taken into account, such as passive scattering, active radiation from material at a given temperature or the response to a thermal excitation. In further development of a full hemispherical scatterometrical device based on an elliptical mirror, an angular resolved IR radiometer has been developed. In contradiction to traditional goniometer designes the set-up allows to measure a hemispherical radiation distribution without moving parts. One application could be the fast acquisition of large amounts of BRDF data in IR range to be compiled into libraries. The use of imaging sensors reduces the measurement time, therefore even time dependence could be addressed. The paper deals with the instrument design, the calibration, and gives some measurement results.

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Calibration procedures and measurement results of a hemispherical fast light-field-meter

Zou

Zhang

et al. 2023

Measurement

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Calibration procedures and measurement results of a fast semihemispherical spectroradiometer in VIS and NIR

Cited by 3 publications

References 0 publications

Design of a semihemispherical spectroradiometer for fast acquisition of BRDF libraries in VIS and NIR

Design of a semihemispherical spectroradiometer for fast acquisition of BRDF libraries in VIS and NIR

Hemispherical radiometer for angle resolved measurement of IR scatter and radiation behaviour

Calibration procedures and measurement results of a hemispherical fast light-field-meter

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