Fourier Transform Blackbody Spectroscopy: Towards Thermodynamic Temperature Measurement

摘要

The concept of basing a temperature scale on a wavelength standard was introduced by Gebbie almost 30 years ago, in a proposal to use Fourier-transform spectroscopy to measure the emission from blackbody sources operated at a series of different temperatures. At the National Research Council of Canada, we have embarked on a project to investigate the feasibility of this idea. Experimental and theoretical results will be shown describing an interpolation technique for obtaining temperature information for intermediate settings of the source, when the highest and lowest spectra are assumed fixed and known. The ratio technique which combines spectra three at a time is then considered as a candidate for determining a self-consistent solution which can calculate the temperatures of all of the data, thus eliminating the requirement for the two calibration points. Work with real and simulated data is presented to explore some of the difficulties faced when attempting to determine absolute thermodynamic temperature in this way.