Increasing the Precision of Measurements of the Mean Power of Optical Radiation by Means of Wiener-Matched Filtration

Abstract

A method which consists essentially in Wiener-matched filtration of the results of measurements of the kinetic behavior of the process of heating up an absolutely black body is proposed and experimentally investigated. The method employs a discrete Fourier transformation and the method of least squares to compare the Fourier spectra of the process being measured with a model process. The Fourier spectrum of a heated absolutely black body at a high level of power of optical radiation in which thermal drift of the absolutely black body is negligible serves as the model process. A three- to five-fold decrease in the total error at low levels of the optical radiation power is achieved.