Regarding Far Infrared: Measurement of Spectral Emissivity

Introduction to the measurement methods and devices for spectral emissivity!

AMK Co., Ltd. is a company that deals with industrial far-infrared heaters, heating devices, and drying equipment. One way to confirm the effectiveness of far-infrared heaters is by measuring the emissivity at each wavelength. This measurement method, known as spectral emissivity, is specified in JIS R 1801. The measuring instrument is called a Fourier Transform Infrared Spectrometer, abbreviated as FTIR. The principle involves measuring the interference waveform of light as a function of space or time and obtaining the spectrum through Fourier transformation. Currently, spectral emissivity measurement using FTIR is mainstream. The resulting graph has frequency (wavelength) on the horizontal axis and ranges from 1 (black body) to 0 on the vertical axis. The closer the value is to 1 at each wavelength, the closer it is to the emissivity of a black body. However, it is important to note that this is a ratio compared to a black body at each wavelength. The difficulty in measurement lies in accurately measuring the temperature of the black body furnace, which is the light source, and the surface temperature of the sample. Considerable skill and experience are required, and different results can often occur depending on the person conducting the measurement or the measuring institution. *For more details, please refer to the PDF document or feel free to contact us.*

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