Temperature calibration device capable of tracing to second definition and temperature calibration method

By using a dual-cavity design within a vacuum chamber and synchronous differential measurement technology, and by utilizing the blackbody radiation frequency shift of cold strontium atoms, high-precision temperature calibration was achieved, solving the problem of material-dependent errors in traditional methods and achieving millikelvin-level measurement accuracy.

CN120800592APending Publication Date: 2025-10-17NAT TIME SERVICE CENT CHINESE ACAD OF SCI
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Patent Information

Application Number
CN202511176022.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-08-21
Publication Date
2025-10-17

AI Technical Summary

Technical Problem

Existing temperature calibration methods have too high absolute uncertainty at room temperature, making it difficult to meet the requirements of high-precision metrology. Furthermore, traditional methods rely on material properties, which leads to calibration errors and makes it difficult to achieve continuous temperature calibration.

Method used

The system employs a dual-cavity design within a vacuum chamber, consisting of a blackbody radiation reference shielding cavity and a blackbody radiation measurement shielding cavity. Temperature control is achieved using a pulse tube refrigerator and a fourth-order Peltier. Simultaneous differential measurement is performed using cold strontium atoms through a movable optical lattice, enabling precise measurement and calibration of the blackbody radiation frequency shift.

Benefits of technology

The absolute uncertainty of temperature calibration has been reduced to below 15 mK, traceable to the second definition, overcoming the material-dependent error in traditional methods, and providing high-precision and reliable temperature measurement.

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Abstract

The invention discloses a temperature calibration device capable of tracing to second definition and a temperature calibration method, and belongs to the field of temperature measurement and quantum precision measurement. The inner walls of a blackbody radiation reference shielding cavity and a blackbody radiation measurement shielding cavity in the device are blackened and are independently arranged in a vacuum cavity; the pulse tube refrigerator is connected with the blackbody radiation reference shielding cavity, the fourth-order Peltier is connected with the blackbody radiation measurement shielding cavity, one end of the high-heat-resistance quartz tube is arranged in the blackbody radiation measurement shielding cavity, and the other end of the high-heat-resistance quartz tube is arranged outside the vacuum cavity. And a platinum resistance thermometer to be calibrated is arranged in the high-heat-resistance quartz tube and is in close contact with the blackbody radiation measurement shielding cavity. The problem that in the prior art, the absolute uncertainty of a temperature calibration result at the room temperature is too high, and the requirement for high-precision measurement is difficult to meet can be solved.
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