Radiometric applications of Fourier-transform spectrometers

Abstract

Filter radiometers are used as transfer standards in many radiometric measurements, and essentially comprise a detector, filter (interference or coloured glass) and high-precision aperture. An initial study into the use of Fourier-transform (FT) spectrometry has resulted in the attainment of medium accuracy (around 0.3 % to 0.7 %) calibration of assembled filter radiometers in a period of a few hours. This contrasts with a day for characterization using a grating instrument and the weeks required for high-resolution, high-accuracy, laser-based calibration. The technique measures the response of the radiometer to be calibrated against that of a standard detector, which in this case is a trap detector.

Detector-based transfer standards for improved accuracy in spectral irradiance and radiance measurements

“…The first has been checked by determining the transmission profile (the main variable) of the double AOTF system using an FT spectrometer as a convenient measurement tool. A description of this FT spectrometer and its use for radiometric measurements is described elsewhere in these proceedings [19]. These measurements showed that the transmission profile of the AOTF system could be effectively modelled to an uncertainty of less than 0.5 % (1 ) in terms of its integrated spectral transmittance as a function of RF frequency and power.…”

A Rapid Synthesis of LDHs Nanosheets/Electrochemical Reduction of Graphene Oxide Nanocomposites to Simultaneously Detect Ascorbic Acid, Dopamine, and Uric Acid

“…If the excretion mechanism of uric acid in human body degenerates, it will lead to gout and other diseases. 8,9 Therefore, in recent years, multifarious and new sensors have been developed to detect these three substances, such as ionic chromatography, 10,11 high performance liquid chromatography, 12,13 calorimetry, 14 spectrophotometry, 15,16 electrochemical method, 1,[17][18][19][20] etc. Among them, electrochemical method has been widely developed because of its rapid sensitivity, high selectivity and excellent stability.…”