Measurement method for high-temperature infrared optical constants of ZnS crystal materials in a multi-layer structure

Fu, Tairan; Liu, Jiangfan

doi:10.1016/j.infrared.2015.01.019

Cited by 8 publications

(3 citation statements)

References 48 publications

(60 reference statements)

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“…The transmittance of coatings itself is simplified evaluated as the ratio of coating/substrate system transmittance to the substrate transmittance. The evaluation neglects the coupling radiative transfer process within the semitransparent coating and the transparent substrate 29 . When the measurement is provided at room temperature, the contribution of radiative transfer is small comparing to high temperature measurement.…”

Section: Measurement and Evaluation Proceduresmentioning

confidence: 99%

Method for emissivity measurement of semitransparent coatings at ambient temperature

Honner

Martan

Veselý

2017

Sci Rep

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Coatings deposited on a material surface are effective way of changing its surface properties. For increasing or decreasing radiation heat transfer, coatings with high or low emissivity are used. Measurement of spectral emissivity is a fundamental step to effective use of coatings for this application. Up to now the measurement methods are focused on bulk samples and mainly opaque ones. Here we present a method enabling measurement of emissivity of semitransparent coating itself, although it is deposited on a substrate. The method is based on measurement of transmittance and reflectance using an integration sphere system and Fourier transform infrared (FTIR) spectrometer for samples with two different coating thicknesses deposited on transparent substrates. Measured transmittance of the coating indicates spectral regions of potential emissivity differences using different substrates. From all the measured values, spectral emissivity can be characterized for different coating thicknesses. The spectral range of the method is from 2 μm to 20 μm. The measurement is done at ambient temperature enabling measurement of samples sensitive to heating like biomedical or nanocoatings. The method was validated on known bulk samples and an example of semitransparent coating measurement is shown on high-temperature high-emissivity coating.

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Section: Measurement and Evaluation Proceduresmentioning

confidence: 99%

Method for emissivity measurement of semitransparent coatings at ambient temperature

Honner

Martan

Veselý

2017

Sci Rep

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“…2 The optical properties of highly transparent substrates are important for accurately designing optical systems and optical fiber waveguides. 3 Several typical methods have been introduced to obtain the optical constants of transparent crystals, 4 such as the combination method based on reflectance and transmittance, [5][6][7][8][9] the Kramers-Kronig transform method, [10][11][12] the photoacoustic technique method, 13,14 the attenuated total reflection method, 15 the ellipsometry method (EM), [16][17][18][19] and the transmission method. 20,21 Recently, the combination method based on the near-normal reflectance and normal transmittance measurement was regularly applied to measure the optical constants of materials with a relatively high refractive index.…”

Section: Introductionmentioning

confidence: 99%

“…20,21 Recently, the combination method based on the near-normal reflectance and normal transmittance measurement was regularly applied to measure the optical constants of materials with a relatively high refractive index. [5][6][7][8][9] For fluoride materials, however, the reflectance of the substrate is less than 0.05. In principle, the method is inappropriate for materials with weak reflection.…”

Section: Introductionmentioning

confidence: 99%

A New Method for Determining the Optical Constants of Highly Transparent Solids

Wang

Zhao

2016

Appl Spectrosc

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Highly transparent substrates are of interest for a variety of applications, but it is difficult to measure their optical constants precisely, especially the absorption index in the transparent spectral region. In this paper, a combination technique (DOPTM-EM) using both the double optical pathlength transmission method (DOPTM) and the ellipsometry method (EM) is presented to obtain the optical constants of highly transparent substrates, which overcomes the deficiencies of both the two methods. The EM cannot give accurate result of optical constants when the absorption index is very weak. The DOPTM is suitable to retrieve the weak absorption index; however, two sets of solutions exist for the retrieved refractive index and absorption index, and only one is the true value that needs to be identified. In the DOPTM-EM, the optical constants are measured first by using the EM and set as the initial value in the gradient-based inverse method used in the DOPTM, which ensures only the true optical constants are retrieved. The new method simultaneously obtains the refractive index and the absorption index of highly transparent substrate without relying on the Kramers-Kronig relation. The optical constants of three highly transparent substrates (polycrystalline BaF, CaF, and MgF) were experimentally determined within wavelength range from ultraviolet to infrared regions (0.2-14 µm). The presented method will facilitate the measurement of optical constants for highly transparent materials.

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The complex refractive index of crude oils determined by the combined Brewster–transmission method

Lai

Xie

Wang

et al. 2020

Infrared Physics & Technology

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Measurement method for high-temperature infrared optical constants of ZnS crystal materials in a multi-layer structure

Cited by 8 publications

References 48 publications

Method for emissivity measurement of semitransparent coatings at ambient temperature

Method for emissivity measurement of semitransparent coatings at ambient temperature

A New Method for Determining the Optical Constants of Highly Transparent Solids

The complex refractive index of crude oils determined by the combined Brewster–transmission method

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