ISO 19618:2017
Fine ceramics (advanced ceramics, advanced technical ceramics) — Measurement method for normal spectral emissivity using blackbody reference with an FTIR spectrometer
ISO 19618:2017 specifies a method used for the determination of normal spectral emissivity and normal quasi-total emissivity of fine ceramics using blackbody reference with a Fourier transform infrared spectrometer (FTIR) at elevated temperatures. This method is applicable to fine ceramics, ceramic matrix composites, and continuous fibre-reinforced ceramic matrix composites which are opaque and highly non-reflective at wavelengths between 1,67 μm and 25 μm. The applicable temperature range is approximately 350 K to 1 100 K.
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Foreword
1 Scope
2 Normative references
3 Terms, definitions and symbols
4 Principle
5 Apparatus
5.1 Measurement system
5.2 Fourier transform infrared spectrometer (FTIR)
5.3 Specimen heating device
5.4 Blackbody furnace
5.5 Temperature measuring devices and thermometer
5.6 Mirror
6 Test specimens
7 Measurement preparation
7.1 Position of a blackbody furnace and a specimen
7.2 Wavelength calibration
7.3 Verification of linearity
7.4 Verification of stability
7.5 Validation of measurement system
8 Test condition
9 Test procedure
9.1 Background infrared radiance spectrum measurement
9.2 Specimen installation
9.3 Infrared radiance spectrum measurement
10 Calculations
10.1 Normal spectral emissivity
10.2 Normal quasi-total emissivity
11 Test report
Annex A (informative) Calculation of theoretical infrared radiance spectrum L(λ,T) using Planck’s blackbody radiation function
Annex B (informative) Christiansen effect
Annex C (informative) Validity of normal quasi-total emissivity
Bibliography
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Foreword
1 Scope
2 Normative references
3 Terms, definitions and symbols
4 Principle
5 Apparatus
5.1 Measurement system
5.2 Fourier transform infrared spectrometer (FTIR)
5.3 Specimen heating device
5.4 Blackbody furnace
5.5 Temperature measuring devices and thermometer
5.6 Mirror
6 Test specimens
7 Measurement preparation
7.1 Position of a blackbody furnace and a specimen
7.2 Wavelength calibration
7.3 Verification of linearity
7.4 Verification of stability
7.5 Validation of measurement system
8 Test condition
9 Test procedure
9.1 Background infrared radiance spectrum measurement
9.2 Specimen installation
9.3 Infrared radiance spectrum measurement
10 Calculations
10.1 Normal spectral emissivity
10.2 Normal quasi-total emissivity
11 Test report
Annex A (informative) Calculation of theoretical infrared radiance spectrum L(λ,T) using Planck’s blackbody radiation function
Annex B (informative) Christiansen effect
Annex C (informative) Validity of normal quasi-total emissivity
Bibliography