Please type a search term (at least two characters)
News
Spectroradiometer calibration device realised for UV wavelength scale
Wavelength ruler developed by EMRP project for on-site wavelength scale calibration of spectroradiometers in the UV wavelength scale
Spectroradiometers, measuring spectral radiance or irradiance, require calibration of their wavelength scale. This is typically accomplished by using wavelength standards, which are either low-pressure discharge lamps filled with pure gas species (helium, neon, argon) or laser sources. In both cases the lines available can be unequally distributed in the spectral range of interest, they can consist of multiplets or they can be of low intensity. Additionally, not all the wavelength standards can be conveniently used for on-site calibrations.
Within the EMRP project Traceability for atmospheric total column ozone (ENV59 ATMOZ), a wavelength ruler for wavelength scale calibration in the spectral range 290–350 nm has been realised. The main idea of this artificial wavelength standard is based on a single-pass Lyot filter. Such a filter generates a regularly spaced transmission as a function of wavelength, which can serve as a reference for (on site) calibration of the wavelength scale of spectroradiometers, like array spectrometers.
The spectral transmission of the ruler has first been measured at the double-monochromator based permanent facility at VSL, used to perform calibration of transmission of filters. Subsequently, the wavelength ruler has been applied for calibration of two different array spectrometers.
Improving large-scale dimensional measurements for manufacturing more
From 2012 to 2016 the IEEE published standards for high-frequency waveguides. EMPIR NeWITT project supports their uptake more
The videos regarding the metrology of appearance cover a variety of topics and will help increase photometry and radiometry expertise across National ... more
Graphene could revolutionise many technology sectors but needs standardisation more
Take part in EURAMET workshop and BIPM survey! more