Limits...
Polarised multiangular reflectance measurements using the finnish geodetic institute field goniospectrometer.

Suomalainen J, Hakala T, Peltoniemi J, Puttonen E - Sensors (Basel) (2009)

Bottom Line: The angles are registered at accuracies better than 2°.During 2004 - 2008, FIGIFIGO has been used in the measurement of over 150 samples, all around northern Europe.The samples concentrate mostly on boreal forest understorey, snow, urban surfaces, and reflectance calibration surfaces.

View Article: PubMed Central - PubMed

Affiliation: Finnish Geodetic Institute, Box 15, 02431 Masala, Finland; E-Mails: teemu.hakala@fgi.fi (T.H.); jouni.peltoniemi@fgi.fi (J.P.); eetu.puttonen@fgi.fi (E.P.).

ABSTRACT
The design, operation, and properties of the Finnish Geodetic Institute Field Goniospectrometer (FIGIFIGO) are presented. FIGIFIGO is a portable instrument for the measurement of surface Bidirectional Reflectance Factor (BRF) for samples with diameters of 10 - 50 cm. A set of polarising optics enable the measurement of linearly polarised BRF over the full solar spectrum (350 - 2,500 nm). FIGIFIGO is designed mainly for field operation using sunlight, but operation in a laboratory environment is also possible. The acquired BRF have an accuracy of 1 - 5% depending on wavelength, sample properties, and measurement conditions. The angles are registered at accuracies better than 2°. During 2004 - 2008, FIGIFIGO has been used in the measurement of over 150 samples, all around northern Europe. The samples concentrate mostly on boreal forest understorey, snow, urban surfaces, and reflectance calibration surfaces.

No MeSH data available.


Bidirectional reflectance geometry. θi, θr, φi, and φr are respectively the zenith and azimuth angles of incident (i) and reflected (r) radiance.
© Copyright Policy
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC3297140&req=5

f1-sensors-09-03891: Bidirectional reflectance geometry. θi, θr, φi, and φr are respectively the zenith and azimuth angles of incident (i) and reflected (r) radiance.

Mentions: Reflectance Factor (R) is defined as [1]:(1)RS=LS(θi,φi,θr,φr)Lid(θi,φi)where LS and Lid are the reflected radiances from a sample and an ideal Lambertian standard surface measured in the same illumination conditions. θi, φi, θr, and φr are the zenith and azimuth angles of incident and reflected radiance as defined in Figure 1.


Polarised multiangular reflectance measurements using the finnish geodetic institute field goniospectrometer.

Suomalainen J, Hakala T, Peltoniemi J, Puttonen E - Sensors (Basel) (2009)

Bidirectional reflectance geometry. θi, θr, φi, and φr are respectively the zenith and azimuth angles of incident (i) and reflected (r) radiance.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3297140&req=5

f1-sensors-09-03891: Bidirectional reflectance geometry. θi, θr, φi, and φr are respectively the zenith and azimuth angles of incident (i) and reflected (r) radiance.
Mentions: Reflectance Factor (R) is defined as [1]:(1)RS=LS(θi,φi,θr,φr)Lid(θi,φi)where LS and Lid are the reflected radiances from a sample and an ideal Lambertian standard surface measured in the same illumination conditions. θi, φi, θr, and φr are the zenith and azimuth angles of incident and reflected radiance as defined in Figure 1.

Bottom Line: The angles are registered at accuracies better than 2°.During 2004 - 2008, FIGIFIGO has been used in the measurement of over 150 samples, all around northern Europe.The samples concentrate mostly on boreal forest understorey, snow, urban surfaces, and reflectance calibration surfaces.

View Article: PubMed Central - PubMed

Affiliation: Finnish Geodetic Institute, Box 15, 02431 Masala, Finland; E-Mails: teemu.hakala@fgi.fi (T.H.); jouni.peltoniemi@fgi.fi (J.P.); eetu.puttonen@fgi.fi (E.P.).

ABSTRACT
The design, operation, and properties of the Finnish Geodetic Institute Field Goniospectrometer (FIGIFIGO) are presented. FIGIFIGO is a portable instrument for the measurement of surface Bidirectional Reflectance Factor (BRF) for samples with diameters of 10 - 50 cm. A set of polarising optics enable the measurement of linearly polarised BRF over the full solar spectrum (350 - 2,500 nm). FIGIFIGO is designed mainly for field operation using sunlight, but operation in a laboratory environment is also possible. The acquired BRF have an accuracy of 1 - 5% depending on wavelength, sample properties, and measurement conditions. The angles are registered at accuracies better than 2°. During 2004 - 2008, FIGIFIGO has been used in the measurement of over 150 samples, all around northern Europe. The samples concentrate mostly on boreal forest understorey, snow, urban surfaces, and reflectance calibration surfaces.

No MeSH data available.