Mr. William H. Wan Profile

William H. Wan

Electro-Optics Engineer Sr Staff at Lockheed Martin Missiles and Fire Control

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Publications (10)

Proceedings Article | 14 June 2023 Presentation + Paper

Calculating the 2D optics point spread function (PSF) using Zernike math model (ZMM) for sensor system performance analysis

Gary Vanstone, William Wan, Andrew Doares, Suresh Subramanian

Proceedings Volume 12533, 125330L (2023) https://doi.org/10.1117/12.2660203

KEYWORDS: Point spread functions, Zernike polynomials, Lens design, Systems modeling, Systems engineering, Modulation transfer functions, Mathematical modeling, Optical design, Sensor performance

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Electro-optics system engineers often require the 2D optical point spread function (PSF) to predict a sensor’s system level performance. The 2D PSF is used to compute metrics like detection range and signal to noise (SNR) at the target, or to develop a matched filter algorithm to improve detection performance. Lens designers generate the 2D optical PSF using optical design tools like CODE-V or Zemax. If the systems engineer needs the PSF data at different field angles, the lens designer has to generate those results again resulting in a cumbersome interaction between these two disciplines. The problem gets exacerbated when going from narrow field of view (NFOV) optics to wide field of view (WFOV) optics where there can be significant differences in the PSF between the on-axis and the off-axis case. This is particularly relevant in the cases of WFOV threat warning and situational awareness infrared sensors where the on-axis Airy-disk model of the PSF is no longer valid for the large off axis angles experienced in those sensors. This paper will present the Zernike Math Model (ZMM) approach to generate 2D optics PSF outside the lens design platform and move the analysis to a more common scientific/engineering tool that systems engineers use. Once an optical design is completed by the lens designer, its performance can be represented by a unique set of Zernike polynomial coefficients. The ZMM approach will only require the lens designer to provide this set of coefficients once, and the system engineer can then use these data to model the optical PSF performance on and off-axis, using standard engineering analysis tools such as MATLAB or Mathcad. Once the optical PSF is known, it can be transformed into the modulation transfer function (MTF) form and used to model sensor performance. Our approach simplifies the interaction between systems engineering and optical engineering disciplines in helping translate optical performance into system level sensor performance modeling.

Proceedings Article | 4 May 2010 Paper

Mid-wave infrared (MWIR) panoramic sensor for various applications

Charles Bjork, William Wan

Proceedings Volume 7660, 76600B (2010) https://doi.org/10.1117/12.849348

KEYWORDS: Sensors, Panoramic photography, Signal to noise ratio, Mid-IR, Infrared sensors, Staring arrays, Sensor performance, Interfaces, Commercial off the shelf technology, Image sensors

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Proceedings Article | 22 April 2009 Paper

Passive IR sensor performance analysis using Mathcad modeling

William Wan

Proceedings Volume 7300, 730005 (2009) https://doi.org/10.1117/12.815238

KEYWORDS: Sensors, Infrared sensors, Signal to noise ratio, Staring arrays, Performance modeling, Mathematical modeling, Palladium, Atmospheric optics, Interference (communication), Fourier transforms

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Proceedings Article | 26 August 1998 Paper

IR FPA sensor characterization and analysis using Matlab tm

Michael Burke, William Wan

Proceedings Volume 3377, (1998) https://doi.org/10.1117/12.319388

KEYWORDS: Staring arrays, MATLAB, Infrared sensors, Sensors, Calibration, Imaging infrared seeker, Infrared imaging, Data acquisition, Nonuniformity corrections, Missiles

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Proceedings Article | 10 June 1996 Paper

Compact airborne staring FPA sensor with microscanning

John Sanders, William Wan, Van Harris, David Newton, George Tylinski, Mark Wolschon, Joseph Imamura

Proceedings Volume 2743, (1996) https://doi.org/10.1117/12.241958

KEYWORDS: Sensors, Staring arrays, Infrared sensors, Video, Image resolution, Ferroelectric materials, Imaging systems, Optical components, Modulation transfer functions, Mid-IR

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Proceedings Article | 10 June 1996 Paper

End-to-end system performance analysis model for FLIR sensor using PC-based scientific spreadsheet

William Wan

Proceedings Volume 2743, (1996) https://doi.org/10.1117/12.241968

KEYWORDS: Sensors, Atmospheric modeling, Performance modeling, Systems modeling, Visual process modeling, Forward looking infrared, Atmospheric sensing, Image sensors, Mathematical modeling, Modulation transfer functions

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Proceedings Article | 22 May 1995 Paper

Two-dimensional system performance analysis using PC-based scientific spreadsheet

William Wan, Gene Toler

Proceedings Volume 2470, (1995) https://doi.org/10.1117/12.210059

KEYWORDS: Sensors, Fourier transforms, Forward looking infrared, Target detection, Modulation transfer functions, Mathematical modeling, Electronics, Scanners, Spatial frequencies, Convolution

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Proceedings Article | 8 July 1994 Paper

Subsystem performance analysis using PC-based scientific spreadsheet

William Wan, Gene Toler

Proceedings Volume 2224, (1994) https://doi.org/10.1117/12.180076

KEYWORDS: Sensors, Signal detection, Target detection, Modulation transfer functions, Electronics, Interference (communication), Fourier transforms, Spatial frequencies, Mathematical modeling, Convolution

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Proceedings Article | 16 September 1992 Paper

Performance and application of serial-scan FLIRs

James Gates, Steven Krug, William Wan

Proceedings Volume 1689, (1992) https://doi.org/10.1117/12.137979

KEYWORDS: Sensors, Infrared sensors, Imaging systems, Forward looking infrared, Infrared imaging, Infrared radiation, Control systems, Signal detection, Staring arrays, Thermography

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Proceedings Article | 1 September 1991 Paper

Development and analysis of a simple model for an IR sensor

Edward Ballik, William Wan

Proceedings Volume 1488, (1991) https://doi.org/10.1117/12.29466

KEYWORDS: Modulation transfer functions, Sensors, Systems modeling, Black bodies, Infrared sensors, Long wavelength infrared, Analytical research, Spatial frequencies, Signal to noise ratio, Target detection

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Showing 5 of 10 publications

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