The on-ground calibration of the Near Infrared Spectrograph (NIRSpec) instrument on-board the James Webb Space Telescope (JWST)

Bagnasco, G.; Ferruit, Pierre; Boeker, Torsten; Closs, Martin F.; Dorner, Bernhard; Gnata, Xavier; Koehler, Jess; Kolm, Manfred; Kuechel, Christoph; Langenbach, Harald; Melf, Markus; Pittet, Jean-Francoise; Plate, Maurice te; Wetteman, Thomas

doi:10.1117/12.788172

Cited by 2 publications

(1 citation statement)

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“…The scientific instrumentation of the JWST consists of four instruments of which one is the near-IR multiobject dispersive spectrograph (NIRSpec), operating in the wavelength range from 0.7 μm to 5 μm. The NIRSpec instrument is foreseen to be calibrated on-ground at the Optical Ground Support Equipment by means of the Radiometric Calibration Spectral Source (RCSS) and in space by the NIRSpecs Internal Calibration Assembly [2]. The RCSS is designed as a very low photon flux, point-like radiation source, typically with photon fluxes in the range from 10 4 to 10 7 photons•μm -1 •s -1 in the wavelength range from 0.7 μm to 5 μm.…”

Section: Introductionmentioning

confidence: 99%

I3.4 - Radiometric calibration of the NIRSpec instrument on the James Webb Space Telescope in the wavelength range from 0.7 μm to 5.0 μm

Taubert¹,

Monte²,

Baltruschat³

et al. 2009

Proceedings OPTO 2009 &Amp; IRS² 2009

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Section: Introductionmentioning

confidence: 99%

I3.4 - Radiometric calibration of the NIRSpec instrument on the James Webb Space Telescope in the wavelength range from 0.7 μm to 5.0 μm

Taubert¹,

Monte²,

Baltruschat³

et al. 2009

Proceedings OPTO 2009 &Amp; IRS² 2009

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Light Source Stability Issues and Measurements in Flux Calibrations for Space Gaze Camera

Lin

Zhang

et al. 2022

Photonics

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Flux calibration is an important test item in laboratory calibration experiments of space gaze cameras, which is the basis for obtaining high-precision scientific application data. In the flux calibration of a space gaze camera, the multi-field calibration method is adopted. The instability of the calibration light source will introduce uncertainty during the calibration process. When the spatial camera adopts the gaze imaging mode, the stability of the light source indicates the change in the total energy received by the image plane during the gaze time, which is characterized by relative uncertainty. When the luminous intensity standard lamp runs for the long-term calibration of the stability of the calibration light source, real-time performance and accuracy cannot be guaranteed. Therefore, it is proposed to use a photodetector to measure the stability of the calibration light source for long-term and real-time accurate measurements. First, the stability of the photodetector is calibrated using the light emitting diode; then, the stability of the calibration light source is measured using the photodetector; finally, the stability uncertainty of the calibration light source and the measurement uncertainty of the method is evaluated. The results of the simulation analysis and experimental verification indicate that the gaze time is 5 min and the sampling frequency of the photodetector is 15 Hz; for example, when the flux calibration time is 8 h, the stability uncertainty of the calibration source is 0.42%, and the relative measurement uncertainty is 0.01%.

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The on-ground calibration of the Near Infrared Spectrograph (NIRSpec) instrument on-board the James Webb Space Telescope (JWST)

Cited by 2 publications

References 0 publications

I3.4 - Radiometric calibration of the NIRSpec instrument on the James Webb Space Telescope in the wavelength range from 0.7 μm to 5.0 μm

I3.4 - Radiometric calibration of the NIRSpec instrument on the James Webb Space Telescope in the wavelength range from 0.7 μm to 5.0 μm

Light Source Stability Issues and Measurements in Flux Calibrations for Space Gaze Camera

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