Measurement method on basis of PI (proportion and integration) controllers for solar absolute radiometers

Abstract

An embodiment of the invention discloses a measurement method on the basis of PI (proportion and integration) controllers for solar absolute radiometers. The measurement method includes acquiring temperature step response curves of blackbody cavities and building mathematical models of the blackbody cavities; simulating and optimizing parameters of the PI controllers by the aid of simulation software; regulating electric power of the blackbody cavities by the aid of the PI controllers at radiation observation stages until cavity temperatures return heat balance states by means of regulation soas to obtain first balance temperatures and compensation electric power; regulating the electric power of the blackbody cavities by the aid of the PI controller at electric calibration stages until the cavity temperatures return the heat balance states by means of regulation so as to obtain second balance temperatures and calibration electric power. The measurement method has the advantages thatthe electric power of the blackbody cavities is regulated by the aid of the PI controllers, accordingly, the regulation time of shutter on-off moments can be shortened, the measurement periods of total solar irradiance monitoring instruments can be shortened, and the problem of deterioration of measurement accuracy of measurement calculation formulas due to photoelectric non-equivalence of the traditional measurement methods can be solved.

Description

technical field [0001] The invention relates to the technical field of solar irradiance measurement, in particular to a measurement method of a solar absolute radiometer based on a PI controller. Background technique [0002] The total solar irradiance (Total Solar Irradiance, TSI) can calculate the solar constant, which is of great significance to the research of solar physics and upper atmosphere. At present, the total solar irradiance is mainly measured by the solar irradiance absolute radiometer. The solar irradiance radiometer is an electrical alternative to radiometers with measurements directly traceable to electrical currents in the International System of Units (SI). The core detector of the solar irradiance absolute radiometer is a black body cavity, and the optical power is reflected and absorbed many times in the black body cavity, so that the cavity temperature reaches a new equilibrium state. Based on the measurement principle of electrical substitution, the ...

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Problems solved by technology

The measurement method of the solar absolute radiometer based on the PI controller provided by the embodiment of the present invention uses the PI controller to maintain the temperature balance of the cavity, and solves the problem of the blackbody cavity in the measurement method of the existing total solar irradiance monitor (TSIM). The problem of mathematical model accuracy requirements, and then improve the measurement accuracy

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