To realize spectral diffuse reflectance scale in mid-infrared waveband in 0/d geometric condition at National Institute of Metrology in China (NIM), a facility based on auxiliary integrating sphere method has been built up. An integrating sphere (diameter 100mm) coated with gold and series of gold plate were used for calculating the reflectance. The uncertainty of spectral diffuse reflectance in NIM is approximately less than 3.0% (k = 2) in 3μm -14μm.
A project focuses on solving the problem of wavelength measurement of mercury lamps has been established, mainly in the air. Using the Fourier transform method, mercury lamp wavelengths are measured with high-precision, better than 0.1pm. By tracing back to the wavelength of the laser, the measuring device was calibrated very carefully using series frequency stabilized Lasers. The measurement uncertainty is better than 5pm (k=2), in the wavelength range of 250nm to 1100nm.
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