Position Sensitivity Of MAMA Detectors

J. S. Morgan; D. S. Slater; J. G. Timothy; E. B. Jenkins

doi:10.1117/12.946895

16 August 1988 Position Sensitivity Of MAMA Detectors

J. S. Morgan, D. S. Slater, J. G. Timothy, E. B. Jenkins

Proceedings Volume 0932, Ultraviolet Technology II; (1988) https://doi.org/10.1117/12.946895
Event: 1988 Technical Symposium on Optics, Electro-Optics, and Sensors, 1988, Orlando, FL, United States

Abstract

We report on the results of laboratory and telescopic measurements of the position sensitivity of a visible MAMA. detector utilizing a "coarse-fine" array. We also report on the photometric accuracy of this detector under the condi-tion of point source illumination. The detector measured uses a bialkalai photocathode and has 25 μm² pixels in a 256 x 1024 format. It was illuminated with a 3.5 pm spot of light (FWHM) which was moved across the detector in 1 μm increments. It is found that computed centroid positions are accurate across the entire array to within 0.04 pixels. For the extreme case of illumination with a delta function source, this detector experienced photometric errors of 10-15%. Both the position sensitivity and the photometric accuracy with point source illumination are limited in this detector by errors in the flat field corrections caused by the presence of cross-coupling between adjacent pixels. Initial measurements with a MAMA detector utilizing a "fine-fine" array indicate that this cross-coupling has been eliminated in the most recent versions of the detector.

Citation Download Citation

J. S. Morgan, D. S. Slater, J. G. Timothy, and E. B. Jenkins "Position Sensitivity Of MAMA Detectors", Proc. SPIE 0932, Ultraviolet Technology II, (16 August 1988); https://doi.org/10.1117/12.946895

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