Improved ultraviolet measurement capabilities of NIST’s reference transmittance spectrophotometer
Year: 2025
Type: article
Abstract: The National Institute of Standards and Technology (NIST) has maintained and operated custom-built reference instruments to establish the national scale for regular spectral transmittance for more than 50 years. In this paper, we report on improvements to the performance of NIST's current iteration of the reference instrument, the reference transmittance spectrophotometer (RTS), in the ultraviolet (UV) and visible spectral range. The improvements include the installation of a new UV source for increased spectral radiance and a monitor line for a reduced noise-to-signal ratio. A new uncertainty budget and validation measurements are presented. A reduction of uncertainties by 70% or more is achieved for UV wavelengths.
Source: Applied Optics
DOI: 10.1364/ao.587552
Language: English
Subfield: Aerospace Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7116758206