Metrological ensures for measuring the spectral sensitivity of terahertz radiation receivers

The issues of metrological ensures for measurements of the spectral characteristics of radiation receivers in a wide spectral range, in particular from the ultraviolet to the terahertz range are consider. Until now, measurements of the spectral sensitivity of receivers in the wavelength range greater than 14 μm have not been metrologically supported, which their use for measuring the power of terahertz radiation when solving problems in the field of medicine, safety and climatology excluded. A reference receiver of terahertz radiation has been developed, manufactured and studied in order to solve the problem of reproducing and transmitting the unit of spectral sensitivity of radiation receivers in the wavelength range of 14–300 μm with traceability to an absolute cryogenic radiometer. The operating principle and design of the developed receiver are described, its metrological characteristics are studied and presented. The components of the uncertainty of the reproduction of the unit of spectral sensitivity of the reference receiver of terahertz radiation are calculated. The uncertainty budget for the reproduction of the unit of spectral sensitivity in the wavelength range of 14–300 μm is presented. An installation based on a monochromatic source of terahertz radiation and a standard receiver of terahertz radiation have been developed. The installation is designed to transfer a unit of spectral sensitivity to receivers of terahertz radiation. The research results are of great importance for many branches of science and technology, since spectral sensitivity measurements are widely used in astrophysics, lighting engineering, geophysics, biophysics, biology, medicine, agriculture, chemistry, metallurgy, etc.