Finnish Geodetic Institute, Box 15, 02431 Masala, Finland; E-Mails:
Sensors (Basel). 2009;9(5):3891-907. doi: 10.3390/s90503891. Epub 2009 May 22.
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.
本文介绍了芬兰大地测量研究所野外多角度分光辐射计（FIGIFIGO）的设计、操作和特性。FIGIFIGO 是一种用于测量直径为 10-50 厘米的样本表面双向反射因子（BRF）的便携式仪器。一组偏光光学器件可在整个太阳光谱（350-2500nm）范围内测量线偏振 BRF。FIGIFIGO 主要设计用于使用阳光进行野外作业，但也可在实验室环境中进行操作。所获得的 BRF 的精度为 1-5%，具体取决于波长、样品特性和测量条件。角度的记录精度优于 2°。在 2004-2008 年间，FIGIFIGO 已在北欧各地的 150 多个样本的测量中得到应用。这些样本主要集中在北方森林林下、雪、城市表面和反射率校准表面。
