Dr. Zongying Wei Profile

Dr. Zongying Wei

Senior Optical Engineer at BAE Systems Inc

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Publications (10)

Proceedings Article | 28 August 2014 Paper

Stray light performance for the James Webb Space Telescope

Paul Lightsey, Zongying Wei, Dennis Skelton, Charles Bowers, Kimberly Mehalick, Shaun Thomson, Perry Knollenberg, Jonathan Arenberg

Proceedings Volume 9143, 91433P (2014) https://doi.org/10.1117/12.2055485

KEYWORDS: Stray light, Phase modulation, Observatories, James Webb Space Telescope, Near infrared, Space telescopes, Telescopes, Adaptive optics, Mirrors, Aerospace engineering

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Proceedings Article | 21 September 2012 Paper

James Webb Space Telescope stray light performance status update

Paul Lightsey, Zongying Wei

Proceedings Volume 8442, 84423B (2012) https://doi.org/10.1117/12.924852

KEYWORDS: Stray light, James Webb Space Telescope, Phase modulation, Observatories, Space telescopes, Telescopes, Adaptive optics, Tolerancing, Scattering, Mirrors

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Proceedings Article | 15 June 2006 Paper

Stray light from galactic sky and zodiacal light for JWST

Zongying Wei, Paul Lightsey

Proceedings Volume 6265, 62653C (2006) https://doi.org/10.1117/12.672287

KEYWORDS: Stray light, Phase modulation, Bidirectional reflectance transmission function, Observatories, James Webb Space Telescope, Ray tracing, Mirrors, Data modeling, Sensors, Light

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Proceedings Article | 13 June 2006 Paper

James Webb Space Telescope Observatory stray light performance

Paul Lightsey, Zongying Wei

Proceedings Volume 6265, 62650S (2006) https://doi.org/10.1117/12.672102

KEYWORDS: Stray light, Observatories, James Webb Space Telescope, Sun, Phase modulation, Space telescopes, Scattering, Near infrared, Telescopes, Light scattering

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Proceedings Article | 26 October 2004 Paper

BRDF measurement and calculation for SBUV/2 radiance calibration test diffuser

Zongying Wei, Kevin Kelly

Proceedings Volume 5542, (2004) https://doi.org/10.1117/12.563073

KEYWORDS: Diffusers, Bidirectional reflectance transmission function, Calibration, Phase transfer function, Lamps, Optical spheres, Free electron lasers, Mirrors, Reflectivity, Vignetting

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Proceedings Article | 15 October 2004 Paper

Stray light estimates for the TPF formation flying interferometer

Charley Noecker, Zongying Wei, James Decino

Proceedings Volume 5526, (2004) https://doi.org/10.1117/12.593647

KEYWORDS: Stray light, Mirrors, Planets, Telescopes, Interferometers, Space telescopes, Light scattering, Scattering, Bidirectional reflectance transmission function, Stars

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Proceedings Article | 31 December 1997 Paper

Calibration and characterization of remote sensing instruments using ultrastable interference filters

Donald Heath, Zongying Wei, Ernest Hilsenrath, Scott Janz

Proceedings Volume 3221, (1997) https://doi.org/10.1117/12.298096

KEYWORDS: Interference filters, Remote sensing, Calibration, Monochromators, Thermal energy technology, Stray light, Environmental sensing, Aerospace engineering, Spectral calibration

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Proceedings Article | 21 December 1994 Paper

Spectroradiometric calibration and validation of space instruments used to derive long-term changes in stratospheric ozone using the solar backscattered ultraviolet radiation technique

Donald Heath, Zongying Wei, Ernest Hilsenrath, William Fowler, V. Nelson, Roel Hoekstra, Carina Olij, Scott Janz

Proceedings Volume 2318, (1994) https://doi.org/10.1117/12.197235

KEYWORDS: Calibration, Diffusers, Optical spheres, Bidirectional reflectance transmission function, Spectral calibration, Ozone, Spherical lenses, Free electron lasers, Lamps, Aerospace engineering

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Beginning in the mid 1960's large aperture scanning radiometers have been used in space to determine spectroradiometric properties of earth scenes in the red and near infrared regions. Panel diffusers as calibration sources for these radiometers were abandoned in favor of internally illuminated integrating spheres because of problems of illuminating the panel diffuser uniformly.1 Since 1970 spectroradiometric instruments used in space for remote sensing of the atmosphere in the ultraviolet for the determination of stratospheric ozone and total column amounts have used spectral radiance calibrations derived from calibrated panel diffusers illuminated by NIST standards of spectral irradiance. An advantage of the panel diffuser technique is simplicity of the experimental set up. Stratospheric ozone profiles and total column amounts are derived from ratios of atmospheric radiances to corresponding solar irradiances incident at the top of the atmosphere in the wavelength region of 250 - 340 nm. An inherent problem associated with measurements for the remote sensing of stratospheric ozone which is not shared with remote sensing measurements of earth scenes at longer wavelengths of the solar scattering and reflective region is the extremely large dynamic range of atmospheric radiances and the steep gradients of radiance with wavelength. For a typical wavelength scan the spectral radiance changes by about lO and the average signal level of a spectral scan can shift by another factor of 25 or more due to solar zenith angle changes between the subsolar point and the solar zenith angle limit of useful scan information which is within a couple of degrees of the terminator. The derivation of spectral radiance calibrations using either the sphere or panel diffuser techniques for ultraviolet remote sensing instruments are single point calibrations at each wavelength. A subsequent linearity calibration of the detector and electronics is made in non dispersed or white light over the entire dynamic range of the instrument of more than six decades. Consequently the derived radiometric calibration constants consist of a radiometric sensitivity term and a signal dependent linearity correction. An initial comparison of spectral radiance calibrations of SBUV-2 instruments using spherical integrator and panel diffuser techniques has been given by Heath et al.2. Subsequent work by Heath et al. describes the results from comparisons of four spectral radiance calibrations derived using panel diffuser techniques with five spectral radiance calibrations derived using spherical integrator techniques for three different SBUV-2 instruments. The comparability of the sphere and panel diffuser spectral radiance calibration techniques is assesed by comparing derived average BRDF values of panel diffusers based upon the sphere technique with laboratory measurements of BRDF of the panel diffusers. The sphere radiances determined relative to NIST standards of spectral irradiance are compared with measurements of sphere radiance relative to a NIST high temperature blackbody source. This work describes the evaluation of the consistency of spectral radiance calibration scales established using panel diffuser and internally illuminated spherical integrator techniques for the SSBUV and SBUV-2 Flight Model 5 instruments using zenith sky radiance measurements as a function of solar zenith angle (UMKEHR) which coincident in space and time. Also described are the spectral radiance calibrations of the Global Ozone Monitoring Experiment (GOME) with the NASA sphere which has been used to intercalibrate SBUV-2 and SSBUV instruments. These spectral radiance calibration constants are compared with those derived using a Spectralon panel diffuser whose BRDF was measured at NASA Goddard Space Flight Center by J. Butler.

Proceedings Article | 14 September 1994 Paper

Comparisons of UV spectral radiance calibrations of SBUV/2 type ozone monitoring instruments and traceability to NIST

Donald Heath, Zongying Wei, William Fowler, V. Nelson, James Butler, Ernest Hilsenrath

Proceedings Volume 2282, (1994) https://doi.org/10.1117/12.186624

KEYWORDS: Diffusers, Optical spheres, Calibration, Bidirectional reflectance transmission function, Spectral calibration, Spherical lenses, Ultraviolet radiation, Black bodies, Lamps, Free electron lasers

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Proceedings Article | 13 September 1994 Paper

Comparability of spectral radiance calibrations of large aperture earth observing instruments based upon diffuse reflective panels and internally illuminated spherical integrator techniques

Donald Heath, Zongying Wei, William Fowler, V. Nelson, Ernest Hilsenrath

Proceedings Volume 2209, (1994) https://doi.org/10.1117/12.185252

KEYWORDS: Diffusers, Optical spheres, Calibration, Bidirectional reflectance transmission function, Spectral calibration, Spherical lenses, Lamps, Phase transfer function, Free electron lasers, Reflectivity

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