&lt;title&gt;NIR daylight acquisition sensor improves mission capabilities&lt;/title&gt;

Chesser, Douglas E.; Vunck, Darius; Born, Terry; Axelson, Wayne; Rehder, Karl; Medrano, Robert S.

doi:10.1117/12.497204

Cited by 2 publications

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“…Chesser [5], Nelson [6], and Xu [7] adopted 0.9 -1.7 μm band according to the difference of spectral characteristics between space targets and sky background. When the aperture was 14 -22 inches, the daytime limit detection capability was 7 -9 mV.…”

Section: Introductionmentioning

confidence: 99%

Infrared methods for daytime detection of space target

Pan

Wang

Duan

et al. 2023

AOPC 2022: Optical Sensing, Imaging, and Display Technology

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In order to solve the problem that ground-based optical telescope cannot detect space targets in the daytime, an infrared detection method is proposed in this paper. Firstly, from the perspective of spectral characteristics of space targets and skylight, the short-wave infrared band(SWIR) of 0.9~1.7μm is optimized, which reduces the brightness of the skylight, and avoids the cooling of the optical system. Secondly, the signal-to-noise ratio(SNR) of the target is improved by the time-domain multi-frame accumulation algorithm and the goal of daytime 'extended range' detection of optical telescope is achieved. Experiments on a 0.3-meter telescope show that the space targets, which SNR less than 1 are detected by adopting this method in the daytime, when the zenith angle of sun is 40°, exposure time is 40ms, and the number of the cumulative frames is 360, the limit detection ability is 10.8mV. The results of the experiments well verify the theoretical analysis, which provides a reference for the system design of the next generation of ground-based optical telescope.Ground based optical telescope; Space targets; Day time; SWIR; Multi-frame accumulation.

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Section: Introductionmentioning

confidence: 99%

Infrared methods for daytime detection of space target

Pan

Wang

Duan

et al. 2023

AOPC 2022: Optical Sensing, Imaging, and Display Technology

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Advanced volume holographic filter to improve the SNR of polychromatic sources in a noisy environment

Alcaraz

Blanche

2021

Opt. Express

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We present a new type of filter that improves the SNR of systems where polychromatic signal and noise are located at different distances within the same line of sight. The filter is based on holographic technology that allows for the discrimination of wavefronts by range. In using a combination of two holographic elements, a pre-disperser and a thick volume hologram, we were able to significantly increase the spectral bandwidth of the filter, from 9nm without the pre-disperser to 70nm with both holographic elements. Laboratory proof of concept demonstrated that such a filter is capable of an SNR improvement of 15 dB for a monochromatic source, and up to 7.6 dB for a polychromatic source. This filter can find applications in astronomic observation, satellite or space debris tracking, and free-space optical communication.

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<title>NIR daylight acquisition sensor improves mission capabilities</title>

Cited by 2 publications

References 0 publications

Infrared methods for daytime detection of space target

Infrared methods for daytime detection of space target

Advanced volume holographic filter to improve the SNR of polychromatic sources in a noisy environment

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