Static Hyperspectral Fluorescence Imaging of Viscous Materials Based on a Linear Variable Filter Spectrometer

Murr, Patrik J.; Schardt, Michael; Koch, Alexander W.

doi:10.3390/s130912687

Cited by 12 publications

(7 citation statements)

References 13 publications

(14 reference statements)

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“…The pixel linearity characteristics on the CMOS 2D sensor array had already been measured in a previous study with two polarization filters at a consistent illumination at the sensor array. 17 For the characterization of the irradiance in the three optical paths, measurements with a power meter (Thorlabs: PM100D) were performed. To ensure that there is no effect resulting from the bandpass filters in the optical paths, the bandpass filters were removed from the measurement setup.…”

Section: System Characterizationmentioning

confidence: 99%

Fluorescence imaging of viscous materials in the ultraviolet-visible wavelength range

Murr

Rauscher

Tremmel

et al. 2014

Review of Scientific Instruments

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This paper presents an approach of an innovative measurement principle for the quality control of viscous materials during a manufacturing process based on fluorescence imaging. The main contribution to the state of the art provided by this measurement system is that three equal fluorescence images of a static or moving viscous object are available in different optical paths. The independent images are obtained by two beam splitters which are connected in series. Based on these images, it is possible to evaluate each image separately. In our case, three optical bandpass filters with different center wavelengths of 405 nm, 420 nm, and 440 nm were used to filter the separate fluorescence images. The developed system is useable for the detection of impurities in the micrometer range. Further, incorrect mixing ratios of particular components and wrong single components in the viscous materials can be detected with the setup. Moreover, it is possible to realize static and dynamic measurements. In this case the maximum speed of the objects was 0.2 m/s for the dynamic measurements. Advantages of this measurement setup are the universality due to the use of optical standard components, the small dimension and the opportunity to integrate it easily into ongoing processes. In addition, the measurement system works on a non-contact basis. Thus, the expense for maintenance is at a very low level compared to currently available measurement setups for the investigated application. Furthermore, the setup provides for the first time a simultaneous analysis of more than one component and the detection of impurities concerning their nature and size in a manufacturing process.

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Section: System Characterizationmentioning

confidence: 99%

Fluorescence imaging of viscous materials in the ultraviolet-visible wavelength range

Murr

Rauscher

Tremmel

et al. 2014

Review of Scientific Instruments

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“…5,6 At present, spectral detection instruments with continuously variable filter as the core spectroscopic element have been successfully applied in various fields such as aerospace, field exploration, atmospheric monitoring, food safety testing, biofluid analysis, and hyperspectral imaging. [7][8][9][10][11] As the spectral division method of space optical systems gradually evolves from system spectral division to focal plane integrated filter spectral division, the resolution becomes higher and the spectral band width becomes wider. Integrated filters will become widely used devices for future space spectral imaging.…”

Section: Introductionmentioning

confidence: 99%

Design of mask for depositing continuously variable filter

Gao,

Wei

2024

J. Nanophoton.

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“…LVF refers to a narrow band filter corresponding to the linear variation passband spectrum at each spatial position in the gradient direction of the filter [7,8]. LVF has a high integration level (low weight, simple structure, and miniaturized), and its spectral coefficient can be adjusted according to the design requirements [9,10]. The efficiency of LVF beam splitting is higher than that of traditional dispersion devices, which is of great significance for the miniaturization and integration of optical systems in space applications [11,12].…”

Section: Introductionmentioning

confidence: 99%

Preparation and Spectrum Characterization of a High Quality Linear Variable Filter

et al. 2018

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To meet the requirements for lightweight, miniaturized dispersive optical systems for space applications, linear variable filters with a high transmittance and spatial dispersion coefficient are proposed. The filters were produced with dual ion beam sputtering, where a single layer thickness variation was achieved with a deposition rate adjustment based on a linear variable correction formula. A linear variable trend matching method was used to correct the film thickness based on the reduction of the mismatch error between two materials: Ta2O5 and SiO2. The influence of the spectral and spatial measuring average effects was addressed by sampling the spot size optimization. This paper presents an all-dielectric linear variable filter that operates between 520 and 1000 nm, with an excellent linear dependence of 40 nm/mm over 12 mm. The linear variable filter possessed a 2.5% bandwidth, and its transmittance was found to be >80% at the central wavelength of the band, with a 0.1% transmittance in the cut-off region. These results indicate great potential for optical devices for space applications, and the developed process has good reproducibility and stability.

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Static Hyperspectral Fluorescence Imaging of Viscous Materials Based on a Linear Variable Filter Spectrometer

Cited by 12 publications

References 13 publications

Fluorescence imaging of viscous materials in the ultraviolet-visible wavelength range

Fluorescence imaging of viscous materials in the ultraviolet-visible wavelength range

Design of mask for depositing continuously variable filter

Preparation and Spectrum Characterization of a High Quality Linear Variable Filter

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