urn:nasa:pds:context:instrument:relab.bc-ftir1 1.3 1.25.0.0 Product_Context Nicolet 740 FTIR Spectrometer at RELAB Nicolet 740 FTIR with Spectra-Tech Bi-conical Diffuse Reflectance Accessory 2026-07-07 1.3 Removed duplicate Internal_Reference entries from Reference_List. 2025-12-24 1.2 Updated schema version. Removed instrument_to_investigation references. Adding missing "facility" references. 2025-01-02 1.1 Updated schema version. Adding missing "investigation" references. Adding missing "facility" references. Update instrument type/subtype to use valid CTLI LDD. 2020-04-09 0.9 Post-peer review version. Still needs instrument description from data provider. urn:nasa:pds:context:facility:laboratory.relab instrument_to_facility NASA Reflectance Experiment Laboratory Nicolet 740 FT-IR Spectrometer Spectrometer Near and Mid Infrared FT-IR Spectrometer The NASA Reflectance Experiment Laboratory (RELAB) Nicolet 740 Fourier-Transform infrared spectrometer with a biconical diffuse reflectance accessory was manufactured by SpectraTech. Using a globar IR light source, NIR range (1.5-4 um) is measured with PbSe detector and Mid-IR range (2-25 um) with DTGS detector, both using KBr beam splitter. Spectrometer interior and sample compartment can be purged with dry air. In addition to its built-in sample compartment, an environmental chamber built by William Patterson and Janice Bishop is attached, allowing Mars-like environment a small, yellow-color dome containing just one sample. The standard reference material is typically diffuse gold. The instrument has been decommissioned.