IDENTIFYING AND CORRECTING INTRA-PIXEL VARIATIONS IN NEAR-INFRARED DETECTORS The Spots-O-Matic Mike Howe and Josh Larson supervised by Prof. Greg Tarlé July 29, 2010
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Joint Dark Energy Mission Wide-field telescope The problem with undersampling
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Weak Lensing applications Precision photometry Necessity of an understanding of intra-pixel variations (Spot-oMatic)
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The Spot-o-Matic Measuring the intra-pixel response for one pixel Limitations with this approach for an entire detector
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Finding the PSF of our lens to ensure that variation in pixel response is possible Detector characteristics: − HgCdTe imager −
2048 x 2048 pixels
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18 x 18 µm² pixel
In order to measure the intra-pixel variation we want a spot-size of, at most, 5µm in diameter
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Knife-Edge scan to determine the PSF of the lens Measuring the integrated signal response of the projected spot across the knife-edge
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Taking a “derivative” to find a 1dimensional Gaussian fit A fit sigma of 3µ would be small enough to scan the intra-pixel variations of the HgCdTe detectors
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Future of the project − Fabrication of all the necessary components − Software development (more in a minute...)
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Four Separate Components Hardware Control Calibration Data Collection Analysis
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Hardware Control Image Acquisition Stage Motion
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Calibration Aligning and focusing the stage Currently being tested with simulated data
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Simulations will not usually be this extreme.
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Future Plans Collection of actual data Analysis This will all be done through simulations first
SPOTS-O-MATIC Thank You! Greg Tarlé
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Michael Schubnell Wolfgang Lorenzon Curtis Weaverdyck Tomasz Biesiadzinski z
Jul 29, 2010 - SPOTS-O-MATIC. â. Future of the project. -. Fabrication of all the necessary components. -. Software development. (more in a minute...) ...
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