Transferability of stray light corrections among array spectroradiometers

Nevas, Saulius; Sperling, Armin; Oderkerk, Benno

doi:10.1063/1.4804896

Cited by 4 publications

(4 citation statements)

References 3 publications

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“…For this reason, simple lasers instead of tunable lasers could be used in this study. Similar to results recorded by NIST [15] and PTB [22][23][24] based on about 80 laser lines, experiments carried out in this study show that it is possible to reduce the spectral stray light by one or two orders magnitude by using only nine simple lasers. Because the corrected spectrum has not been compared with a reference spectrum in studies [15,[22][23][24] and also because the results are dependent of the model of spectroradiometers, as shown in this study, it is not possible to assess the impact of reducing the number of lasers from 80 to 9 on the measurement uncertainty.…”

Section: Discussionsupporting

confidence: 88%

“…Similar to results recorded by NIST [15] and PTB [22][23][24] based on about 80 laser lines, experiments carried out in this study show that it is possible to reduce the spectral stray light by one or two orders magnitude by using only nine simple lasers. Because the corrected spectrum has not been compared with a reference spectrum in studies [15,[22][23][24] and also because the results are dependent of the model of spectroradiometers, as shown in this study, it is not possible to assess the impact of reducing the number of lasers from 80 to 9 on the measurement uncertainty. The method limitations can be tested by further reducing the number of lasers but the selection of the suitable wavelengths of the remaining lasers requires a EN14255-1 [29] and EN 14255-2 [30] standards relating to the measurement and assessment of personal exposure to incoherent radiation in the workplace, require minimal instrument sensitivity set at 1/10 of the applied ELV.…”

Section: Discussionsupporting

confidence: 88%

“…The corrected signal is obtained by a simple matrix multiplication. This method based on a tunable laser is also used by Physikalisch Technische Bundesanstal (PTB) [22][23][24] to characterize the spectrometer stray light behaviour within the wavelength range of 200 to 1100 nm. This simple solution, easily implemented in acquisition software, has several advantages, with the exception of the high cost of the tunable laser.…”

Section: Introductionmentioning

confidence: 99%

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Stray light correction on array spectroradiometers for optical radiation risk assessment in the workplace

Barlier-Salsi

2014

J. Radiol. Prot.

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The European directive 2006/25/EC requires the employer to assess and, if necessary, measure the levels of exposure to optical radiation in the workplace. Array spectroradiometers can measure optical radiation from various types of sources; however poor stray light rejection affects their accuracy. A stray light correction matrix, using a tunable laser, was developed at the National Institute of Standards and Technology (NIST). As tunable lasers are very expensive, the purpose of this study was to implement this method using only nine low power lasers; other elements of the correction matrix being completed by interpolation and extrapolation. The correction efficiency was evaluated by comparing CCD spectroradiometers with and without correction and a scanning double monochromator device as reference. Similar to findings recorded by NIST, these experiments show that it is possible to reduce the spectral stray light by one or two orders of magnitude. In terms of workplace risk assessment, this spectral stray light correction method helps determine exposure levels, with an acceptable degree of uncertainty, for the majority of workplace situations. The level of uncertainty depends upon the model of spectroradiometers used; the best results are obtained with CCD detectors having an enhanced spectral sensitivity in the UV range. Thus corrected spectroradiometers require a validation against a scanning double monochromator spectroradiometer before using them for risk assessment in the workplace.

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Section: Discussionsupporting

confidence: 88%

Section: Discussionsupporting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

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Stray light correction on array spectroradiometers for optical radiation risk assessment in the workplace

Barlier-Salsi

2014

J. Radiol. Prot.

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“…We have investigated the stability of a number of array spectroradiometers from different manufacturers (models) throughout time intervals of up to five years. The stability of the wavelength calibration of the instruments was checked with the help of atomic emission line spectra (Hg, Cd, He, etc) and the wavelength-tuneable laser radiation of the PLACOS setup [5,6]. The use of the tuneable laser source also enabled the complete characterization of the stray light properties of the array spectroradiometers and the monitoring of the stability of these characteristics.…”

Section: Temporal Stabilitymentioning

confidence: 99%

Stability of array spectroradiometers and their suitability for absolute calibrations

et al. 2012

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An investigation of the short- and long-term stability of various low-end and high-end array spectroradiometers is presented. Potentially weak points of array spectroradiometers with respect to their suitability for absolute calibrations are pointed out. The influence of ambient conditions on relevant instrumental characteristics and their temporal stability is discussed. It is shown that the temporal stability of some instruments can be significantly affected by high ambient humidity. Most important ambient temperature effects on instrument properties are also discussed.

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Measurement of light absorption by chromophoric dissolved organic matter using a type-II liquid capillary waveguide: assessment of an achievable accuracy

Röttgers,

Novak,

Belz

2024

Appl. Opt.

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Light absorption by chromophoric dissolved organic matter (CDOM) in the ocean is often measured using liquid waveguide capillary cells coupled to spectral array detectors. This type of optical setup is affected by several sources of uncertainties related to the waveguide and the detector. Uncertainties from the waveguide arise from errors in the effective path length and the effects of water salinity, while errors related to the detector are due to the non-linearity in the response, internal stray light, and wavelength accuracy. Here, uncertainties in the measurements of the spectral absorption coefficient of CDOM due to the optical setup itself were investigated in detail. The related systematic errors were very often significant (2–15%) and larger than expected from simple measurement uncertainty (±1%). However, they can be corrected by characterizing the detector’s response for non-linearity and stray light, regularly performing calibrations for the detector’s wavelength response, and routinely measuring the waveguide’s effective path length. Including such corrections and timely calibrations reduces the uncertainties related to the spectrophotometric measurements to about ±2%. Uncertainties related to the necessary handling of samples are not included here.

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Transferability of stray light corrections among array spectroradiometers

Cited by 4 publications

References 3 publications

Stray light correction on array spectroradiometers for optical radiation risk assessment in the workplace

Stray light correction on array spectroradiometers for optical radiation risk assessment in the workplace

Stability of array spectroradiometers and their suitability for absolute calibrations

Measurement of light absorption by chromophoric dissolved organic matter using a type-II liquid capillary waveguide: assessment of an achievable accuracy

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