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Spectral Evolution, a leader in spectroradiometers and spectroscopy solutions, has published a series of technical whitepapers, which is now available on GoPhotonics. These resources cover advanced applications and methodologies in spectroscopy, offering detailed insights for researchers, engineers, and industry professionals. The whitepapers explore topics ranging from precision spectral measurements to optimized techniques for field and laboratory use, providing valuable guidance for enhancing accuracy and performance in optical analysis.

The following whitepapers are part of this release:

UV-Vis-NIR Spectroscopy in Art and Archeology

This whitepaper describes how full-range spectroscopy (350-2500 nm), also known as fiber-optic reflectance spectroscopy (FORS), is increasingly used in museums and field sites for non-destructive analysis of art, historical artifacts, and archaeological materials. Using instruments such as the NaturaSpec™/NaturaSpec™ Plus spectroradiometers combined with an art-probe (spot size down to ~1 mm), the technique enables fine measurement of materials like paints, manuscripts, glass, soil strata, and building materials without damaging the object. It aids authenticity studies, identification of pigment and binder composition, environmental and aging effects, site characterization, and degradation in art forms and archival materials. The instruments’ high sensitivity and spectral resolution make them suitable for small, delicate, or difficult-to-access samples, supporting conservation, restoration, and archaeological investigations.

Click here to download the Whitepaper.

Confidence in Calibration Using UV-VIS-NIR Spectroradiometers

This whitepaper discusses how proper calibration is essential for producing reliable data with UV-VIS-NIR spectroradiometers, emphasizing traceability to known standards, understanding measurement uncertainties, and the need for both verification and validation. Radiometric calibration is described as characterizing a sensor’s response to known light inputs, often via integrating spheres, and establishing a calibration “audit trail” from standards through to the instrument. The paper also highlights how ideal calibration transfer standards should exhibit uniform power distribution over the target spectral range, low aging, spatially consistent output, and stable, reproducible performance. For cases where frequent transport of equipment isn’t feasible, on-site spectroradiometers with high stability across temperature changes are presented as options to maintain traceability and stability of measurements.

Click here to download the Whitepaper.

Radiometric Calibration with a Field Spectroradiometer

This whitepaper explains how portable UV-VIS-NIR spectroradiometers are used in the field to provide accurate radiometric measurements, particularly for applications like satellite calibration, remote sensing, and environmental monitoring. It explains that calibration involves comparing observed measurements to known, traceable standards; field instruments are designed to be rugged and sensitive enough for in-situ measurements capturing radiance, irradiance, reflectance, and transmittance. The note also discusses how integrating spheres, spectroradiometer stability (including across temperature variation), fore optics, and the number and timing of scans are important contributors to calibration accuracy. By using well-calibrated field instruments, data from ground measurements can help correct sensor drift, support vicarious calibration efforts, and improve the reliability of remote and satellite sensor data.

Click here to download the Whitepaper.

Distinguishing Rare Earth Minerals with a Field Portable Spectrometer

This whitepaper elaborates on how field-portable spectrometers can be used by exploration geologists to distinguish among various rare earth element (REE) minerals (e.g. Monazite, Xenotime, Bastnaesite) in situ. Each mineral has characteristic spectral absorption or transition features in the UV-Vis-NIR-SWIR range (about 350-2100 nm): Bastnaesite shows many sharp f-f electronic absorption features plus broader SWIR bands (including vibrational absorptions due to carbonate groups); Xenotime has sharp absorptions across ~0.35-1.8 µm associated with heavy lanthanide constituents; Monazite exhibits distinct absorptions at wavelengths such as ~550 nm, 680 nm, 750 nm, 810 nm, and 880 nm from Nd³? and Sm³? ions. The study thus shows that by examining specific absorption/transition features, field spectra can reliably differentiate among REE minerals during exploration work.

Click here to download the Whitepaper.

Using NIR Spectroscopy in Ore Recovery

This whitepaper describes how the oreXpress field-portable NIR spectrometer, in combination with EZ-ID mineral identification software, helps geologists accurately and quickly identify alteration and clay minerals (for example kaolinite, montmorillonite, talc, mica) in core samples. This mineralogical information is crucial for selecting the best recovery methods - blasting, crushing, grinding, flotation or leaching - because different minerals affect how well ores respond to these processes. The oreXpress operates across the full spectral range (350-2500 nm), with high resolution, sensitivity, and features like auto-shutter, auto-exposure, and auto-dark correction. With optional accessories (mineral contact probe) and customizable spectral libraries (USGS, SpecMIN, or user-built), it supports rapid, field-friendly scanning and helps optimize ore processing by identifying problematic minerals and informing metallurgical parameters.

Click here to download the Whitepaper.

Together, these whitepapers from Spectral Evolution highlight the versatility and impact of UV-VIS-NIR spectroscopy across diverse fields - from art conservation and archaeological studies to mineral exploration, ore recovery, and remote sensing calibration. By showcasing how portable spectroradiometers and spectrometers deliver precise, non-destructive, and field-ready measurements, they underscore the technology’s role in advancing both scientific research and practical industry applications.