Measurement Repeatability WFC3 – spatial scan mode analysis – work in progress Mark Swain, Pieter Deroo, Kiri Wagstaff IPAC JWST workshop 3/11/14 Jet Propulsion.

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Presentation transcript:

Measurement Repeatability WFC3 – spatial scan mode analysis – work in progress Mark Swain, Pieter Deroo, Kiri Wagstaff IPAC JWST workshop 3/11/14 Jet Propulsion Laboratory, California Institute of Technology Copyright 2014 California Institute of Technology. All rights reserved.

Questions Investigated Multiple timescales involved What are the properties of the measurements in individual integrations? – Mean, standard deviation, Gaussianity What are the properties for orbit-to-orbit groups of measurements? – Mean, standard deviation, Gaussianity measurement repeatability test 3/11/141Swain – IPAC JWST 3/11/14

Data analyzed observations of GJ 1214 Scan rate artifacts present Instrument performance changes with time – also true in stare mode time wavelength Swain et al /11/142Swain – IPAC JWST 3/11/14

Single integration frameλ row ~2.4e4 σ3.3 theory~2.0 theory Gaussianity~no Green: 9882 pixels in green box Red: 81 pixel in single wavelength pixel flux histogram green box 3.3x theoretical noise 3/11/143Swain – IPAC JWST 3/11/14

Single orbit Histogram 187,758 pixel values in the orbit with and without integration mean shifting. Integration mean value shifts do not materially change measurement properties. 3/11/144Swain – IPAC JWST 3/11/14 Measurements are 3.8 x theoretical noise & non-Gaussian

Visit (orbits 2&4) – raw and ima give same results each pixel in images below is based on of 81 detector pixels Flux Normalized to Visit Mean 60% data non Gaussian with P>90% σ M / σ T Histogram 3/11/145Swain – IPAC JWST 3/11/14 σ measured / σ thory

Measurement Repeatability NSAMP=2NSAMP=8 Compare: Orbit_1,Nsamp_2 – Orbit_3,Nsamp_2 Orbit_1,Nsamp_8 – Orbit_3,Nsamp_8 3/11/14 6 Swain – IPAC JWST 3/11/14

Data summary Standard deviation ~2-3 x theoretical noise during a detector integration. – Not changed by shifting the broadband or spectral integration mean values. Majority of measurements non-Gaussian. – Implies systematics present during a single detector integration. – Confidence interval determination problematic. Measurement repeatability problems seen with individual samples up the ramp. – Shows systematic differences between nondestructive reads during an integration. 3/11/147Swain – IPAC JWST 3/11/14