Staring MWIR, LWIR and 2-color and scanning LWIR polarimetry technology

Malone, Neil; Kennedy, Adam; Graham, Roger W.; Thai, Yen; Stark, Justin; Sienicki, Joe; Fest, Eric

doi:10.1117/12.897345

Cited by 10 publications

(12 citation statements)

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“…A DOFP MPA is based on periodically distributed superpixels, wherein a superpixel is generally composed of quad pixelated nano wire gratings with orientations of 0°, 45°, 90°, and 135°. Up to now, there are two main approaches to implement MPA-FPA integration, directly fabricating MPA on the FPA [11,12], or gluing an FPA with a MPA fabricated on a discrete substrate [13]. For the former one, there could be limitations during wire grating fabrications in terms of process compatibilities, especially for cryogenic devices like HgCdTe FPAs.…”

Section: Introductionmentioning

confidence: 99%

Study on micropolarizer array performance dependences on assembling process

Chen

Xiao

et al. 2023

Ninth Symposium on Novel Photoelectronic Detection Technology and Applications

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Integrating Infrared (IR) Focal Plane Array (FPA) detectors with micropolarizer array achieves viable IR polarimeters. This work systematically studies the extinction ratio (ER) variation tendencies of the polarimeter associated with the assembling process. A 3D Finite-Different Time Domain (FDTD) model was established to characterize the electrical field distributions and extract the concerned parameters. The ER variation caused by the distance between the plane of grating wires and the focal plane is significant, while the one caused by the tilting is moderate. Hereby reasonable assembling strategies can be determined. What’s more, optimization methods have been proposed, which enables preferrable ERs with no additional process difficulties.

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Section: Introductionmentioning

confidence: 99%

Study on micropolarizer array performance dependences on assembling process

Chen

Xiao

et al. 2023

Ninth Symposium on Novel Photoelectronic Detection Technology and Applications

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“…Polarization of light provides valuable information about scenes that cannot be obtained directly from intensity or spectral images and polarization images seek to obtain the vector nature of the optical field from the scene [1]. Polarization imaging is widely used in those fields, such as industrial inspection [2], environmental monitoring [3], biomedical diagnosis [4,5], marine detection [6][7][8], remote sensing [9][10][11], military reconnaissance [12][13][14], etc.…”

Section: Introductionmentioning

confidence: 99%

An Image Auxiliary Method for Quantitative Analysis of Laser-Induced Breakdown Spectroscopy

Zhang

Sun

et al. 2018

Anal. Chem.

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Improving both the stability and accuracy of laser-induced breakdown spectroscopy (LIBS) is an issue in quantitative analysis. For certain environments outside of the laboratory, consistently and exactly maintaining the distance from the optical system to the sample surface is difficult, and fluctuations of this distance severely affect the stability of the spectrum. In this work, the principal components of the plasma images are extracted and used to correct the spectral line intensities as an auxiliary method to reduce spectral fluctuation. The presented image auxiliary method is combined with univariate analysis and multivariate analysis, and the element concentrations of Cu, Mn, V, and Cr in steel samples are analyzed. For univariate analysis, all the determination coefficients ( R) of the four elements exceed 0.99, whereas the average relative standard deviations (RSDs) of the intensities decrease from 30.45, 23.14, 27.03, and 22.04%, to 2.13, 3.38, 2.49, and 3.58%, respectively. For the multivariate analysis, the R values for Cu, Mn, V, and Cr also all exceed 0.99, and the average RSDs of the predicted concentrations of the validation samples decrease to 2.87, 3.82, 2.86, and 6.51%, respectively.

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“…The Navy and Air Force have performed extensive research in the detection of polarized targets [1]- [2] and have built and tested several infrared polarimeters [3]- [5] for a wide range of applications [6]- [7]. Polarimeters are typically used to reduce clutter and increase contrast of the target thereby increasing detection ranges and identification of man-made targets.…”

Section: Introductionmentioning

confidence: 99%

Predicted NETD performance of a polarized infrared imaging sensor

et al. 2014

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Polarization filters are commonly used as a means of increasing the contrast of a scene thereby increasing sensor range performance. The change in the signal to noise ratio (SNR) is a function of the polarization of the target and background, the type and orientation of the polarization filter(s), and the overall transparency of the filter. However, in the mid-wave and longwave infrared bands (MWIR and LWIR), the noise equivalent temperature difference (NETD), which directly affects the SNR, is a function of the filter's re-emission and its reflected temperature radiance. This paper presents a model, by means of a Stokes vector input, that can be incorporated into the Night Vision Integrated Performance Model (NV-IPM) in order to predict the change in SNR, NETD, and noise equivalent irradiance (NEI) for infrared polarimeter imaging systems. The model is then used to conduct a SNR trade study, using a modeled Stokes vector input, for a notional system looking at a reference target. Future laboratory and field measurements conducted at Night Vision Electronic Sensors Directorate (NVESD) will be used to update, validate, and mature the model of conventional infrared systems equipped with polarization filters.

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Staring MWIR, LWIR and 2-color and scanning LWIR polarimetry technology

Cited by 10 publications

References 0 publications

Study on micropolarizer array performance dependences on assembling process

Study on micropolarizer array performance dependences on assembling process

An Image Auxiliary Method for Quantitative Analysis of Laser-Induced Breakdown Spectroscopy

Predicted NETD performance of a polarized infrared imaging sensor

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