Radiometer absorption cavity temperature bistable control method based on adaptive Smith estimation

By combining an adaptive Smith predictor and a PI controller, the electric heating power of the radiometer absorption cavity is dynamically adjusted, solving the problem of synchronizing and stabilizing the cavity temperature and the controller output, and realizing high-precision radiometer measurement.

CN121364008AActive Publication Date: 2026-01-20CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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Patent Information

Application Number
CN202511942264.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-12-22
Publication Date
2026-01-20
Estimated Expiration
2045-12-22

AI Technical Summary

Technical Problem

Existing control technologies make it difficult to achieve a rapid and synchronized steady-state transition between the temperature of the radiometer's absorption cavity and the controller's output, resulting in insufficient measurement accuracy of the radiometer.

Method used

An adaptive Smith predictor combined with a PI controller is used to dynamically adjust the electric heating power of the absorption cavity through feedforward control and Smith predictor feedback loop, so as to achieve rapid stabilization and precise control of the cavity temperature.

Benefits of technology

It achieves high-precision control of the absorption cavity temperature of the radiometer with an error of less than 0.05% and a repeatability of measurement results of less than 0.005%, while reducing the size and structural complexity of the equipment.

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Abstract

The invention relates to the technical field of irradiance measurement, in particular to a radiometer absorption cavity temperature bistable control method based on self-adaptive Smith estimation, which combines feed-forward control, PI control and a self-adaptive Smith predictor. A self-adaptive Smith predictor is adopted to predict behaviors of a radiometer absorption cavity, electric heating output of the radiometer absorption cavity is completed through PI control, output of a temperature controller and the temperature of a controlled cavity are rapidly adjusted, the radiometer absorption cavity enters a steady state synchronously, and meanwhile the cavity temperature of the high-precision radiometer absorption cavity and stable electric heating output meeting the measurement precision requirement are obtained.
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