The lateral method of temperature is usually to compare the spectral distribution of the standard bulb with the distribution of the temperature gauge and the spectral distribution of the sample bulb (in fact, the two wavelengths). The comparison is carried out by means of a spectrophotometer or a two meter with two different wavelength centers with a narrow spectral response at the wavelength domain. The comparison of the two wavelengths of the standard bulb is compared with the response of the two wavelengths of the sample bulb. If the response ratio of the standard bulb is equal to that of the sample bulb, the distribution temperature of the two is the same.
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