High-precision MTF measurement instrument for focal-plane arrays with on-chip TDI

Gumbel, Harold; Golub, Sherman L.; Adams, Frank W.; Morimoto, Kevin; Wolford, Paul G.; Jones, Robert B.

doi:10.1117/12.60530

Cited by 3 publications

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“…In reference to the convolution terminology, this is to say: G ' is the convolution of G and F and g ' is the product of g and f, then we have the image forming theory expressed in two ways: (4) and G'(x,y)J J_ K(x-x0,y-y0) 2G(x0 ,y0)dx0dy0 (5) where K is the amplitude point spread function at (x, y) due to the disturbance at (x , yj, G' means the product factor of the contrast of a grating, and the exponential term indicates the lateral shift of the image of the grating in comparison to the ideal image.…”

Section: Technical Backgroundmentioning

confidence: 99%

<title>Modulation transfer function of active pixel focal plane arrays</title>

et al. 2000

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Modulation Transfer Function (MTF) is an important figure of merit in focal plane array sensors, especially for accurate target positions such as star trackers. In-situ evaluation by MTF in different stages of imager system developments is necessary for an ideal design of different sensors and their signal processing. Understanding the tradeoffbetween different figures of merit will enable designers to achieve the most efficient design in specific missions. Advanced active pixel test sensors have been designed and fabricated where different pixel shapes were placed. Research on analyzing the MTF for the proper pixel shape is currently in progress for a centroidal configuration of a star. Explicit formulas for the modulation transfer function have been studied for the rectangular shaped pixel anay. MTF will give us a more complete understanding of the tradeoffs opposed by the different pixel designs and by the signal processing conditions. In this paper, preliminary results of two different active pixel sensor (APS) focal plane arrays are presented in terms of crosstalk using a laser. MTF measurements of the APS arrays are achieved by applying only a single image. A rising or falling edge rather than the conventional bar target of slit scanning is needed to perform the measurement in each direction for the evaluation of the design efficiency.

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Section: Technical Backgroundmentioning

confidence: 99%

<title>Modulation transfer function of active pixel focal plane arrays</title>

et al. 2000

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Experimental characterization, evaluation, and diagnosis of advanced hybrid infrared focal plane array electro-optical performance

Lomheim

Schumann

Kohn

1998

Infrared Detectors and Focal Plane Arrays V

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Measurement method of the modulation transfer function of focal plane arrays

et al. 2001

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Focal plane arrays (FPA) of HgCdTe detectors with responses in the 3-5 m or 8-14 m bands have been successfully incorporated into infrared imagers. Using a variety of digital signal processing techniques, good imagery has been obtained but the image quality is limited by sampling effects at the focal plane that cause non-isoplanantism and aliasing. The verification of the operation of these detectors is an important step in the design and development process. Modulation transfer function (MTF) is a measurement of how well the system will faithfully reproduce the scene. As the MTF decreases, scene detail associated with those specific spatial frequencies will be reproduced with lower contrast. The development of focal plane arrays with considerable on-chip processing, notably time-delay integration, imposes new and severe requirements on the instrumentation to establish the MTF of the integrated focal plane arrays. 1 This paper details a method for measuring the MTF for such arrays. Several methods to derive the MTF from the experimental data were investigated; the preferred appr oach is presented.

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High-precision MTF measurement instrument for focal-plane arrays with on-chip TDI

Cited by 3 publications

References 0 publications

<title>Modulation transfer function of active pixel focal plane arrays</title>

<title>Modulation transfer function of active pixel focal plane arrays</title>

Experimental characterization, evaluation, and diagnosis of advanced hybrid infrared focal plane array electro-optical performance

Measurement method of the modulation transfer function of focal plane arrays

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