urn:nasa:pds:context:instrument:pgl.asd-fieldspec3 1.0 1.16.0.0 Product_Context 2023-08-28 1.0 Initial version. urn:nasa:pds:context:facility:laboratory.pgl instrument_to_facility Analytical Spectral Devices FieldSpec 3 Spectrometer VNIR Analytical Spectral Devices FieldSpec 3 https://www.malvernpanalytical.com/en/products/product-range/asd-range/fieldspec-range {website only has info for upgraded FieldSpec 4} Manual for FieldSpec 3 available at http://www.geo-informatie.nl/courses/grs60312/material2017/manuals/600540-JFieldSpec3UserManual.pdf The 0.35-2.5 um range was acquired at ambient room temperature and pressure with an Analytical Spectral Devices FieldSpec 3 with fiber optic cable bundle. Spectral resolution was 3 nm FWHM in the 0.35-1.0 um range and 10 nm FWHM resolution from 1.0-2.5 um. Geometry (biconical) of the measurements was an incidence of 0º and emission angle of 30º, for a phase angle of 30º. Illumination was provided by a bare quartz halogen full spectrum bulb 40 cm above the sample. Measurements were taken relative to a flat Spectralon standard that was positioned at the same height as the sample.