New technologies to reduce stray light for measuring solar UV with array spectroradiometers

Egli, Luca; Gröbner, Julian; Šmíd, Marek; Porrovecchio, G.; Burnitt, Tim; Nield, Kathryn; Gibson, Steve B.; Dubard, J.; Nevas, Saulius; Tormen, Maurizo

doi:10.1063/1.4804897

Cited by 1 publication

(2 citation statements)

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“…An earlier theoretical study [2] of commercial spectroradiometers demonstrated a four order of magnitude stray light contribution from wavelengths above the UV range of interest (290 nm to 440 nm), which would interfere with an accurate UV spectral intensity measurement. The same study proposed that implementing a digital micromirror device (DMD) could significantly reduce the impact of stray light using two techniques.…”

Section: Introductionmentioning

confidence: 99%

“…The same study proposed that implementing a digital micromirror device (DMD) could significantly reduce the impact of stray light using two techniques. The first involves leveling the dynamic range of the incoming radiation by selective wavelength modulation [2,3] where the undesired wavelengths are modulated at high frequency, creating an effective repetition rate, reducing their intensity and stray light contribution. The second method is to select a precise range of wavelengths using the DMD as an effective bandpass filter [2].…”

Section: Introductionmentioning

confidence: 99%

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Diode-array UV solar spectroradiometer implementing a digital micromirror device

Feldman¹,

Burnitt²,

Porrovecchio³

et al. 2014

Metrologia

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The solar ultraviolet spectrum captured by commercially available diode-array spectroradiometers is dominated by stray light from longer wavelengths with higher intensity. The implementation of a digital micromirror device in an array spectroradiometer has the potential to enable the precise selection of desired wavelengths as well as the ability to reduce spectral intensity of some wavelengths via selective mirror modulation, both reducing long wavelength stray light. A prototype consisting of off-the-shelf components has been assembled to verify the validity of the base concept, and initial measurements have been performed to confirm the throughput and image qualities such as spectral resolution and astigmatism.

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Section: Introductionmentioning

confidence: 99%