Method for measuring temp. in high-temp. high-pressure closed cavity

Abstract

The invention is temperature measuring method in high pressure and high temperature sealed cavity, it assembles a temperature T1-Tn, pressure sensor on the external surface of the cavity and acquires the P, the near place is assembled with environmental temperature sensor and acquires the Th1-Thn and a cavity heating current sensor and acquires I. the computer carries on preprocess to the measured values, and eliminates the deformed signal. The processed signal value is carried on with wavelet transition, and sends then into primary element to be analyzed. The acquired data is transmitted to the dynamic nerve network to carry on self adaptable intelligent calculation, the temperature in the cavity is T=F (T1... Tn, Th1..., Thn, I, P). The invention uses multi-point measurement to measure multi variables, uses primary element analysis, nerve network and other technologies to realizes the dynamic measurement in the high temperature and high pressure cavity; the result will not be affected by the resistance in the cavity; then carries on wavelet transition filter, and online self adaptable correcting function, it guarantees the accuracy of the measurement; the result can be displayed or outputted. It can be applied to the temperature measurement and real-time control in the diamond synthesis cavity.

Description

(1) Technical field [0001] The invention relates to a temperature measurement method, in particular to a temperature measurement method in a high-temperature, high-pressure closed cavity. (2) Technical background [0002] In the measurement of high temperature and high pressure, the measurement of pressure has been mature, but the measurement of high temperature in a closed cavity has always been a difficult problem. The reason is that the high temperature in a closed cavity cannot be directly measured, and the existing methods are only estimated based on experience. [0003] For example, in the process of using a six-sided top press to produce diamonds, since the synthesis chamber is made of pyrophyllite, high pressure is applied outside the closed chamber, and the graphite-diamond phase transition is achieved under the conditions of a pressure of 5.0Gpa and a temperature of 1600K to obtain diamond crystals. [0004] Because of the high temperature and high pressure in the ...

AI Technical Summary

Problems solved by technology

[0013] That is to say, various parameters in the high-temperature and high-pressure airtight cavity change from time to time during the whole heating process. When the resistivity K of a constant cavity is used to determine the constant current (constant power) of the synthetic cavity by direct heating during diamond synthesis , it is obviously impossible to effectively control the temperature in the airtight cavity to keep it in the optimum temperature zone, so it is difficult to produce high-quality diamond products

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