Abstract：A new method for measuring the temperature of the fluid in a tube is proposed, which is based on the measurement of the complex permittivity of the liquid using a microwave resonant cavity, and combines the Debye and Cole-Cole equations to obtain the temperature value of the measured liquid. Firstly, the shortcomings of the commonly used methods for measuring the temperature of the fluid in the tube are briefly introduced. Secondly, the working principle of the measurement system is introduced in detail. Taking the two working modes of TM010 and TM011 as examples, the measurement of pure water is carried out. By comparing the measurement results in the two working modes, it is confirmed that the proposed method can achieve fast and accurate temperature measurement while accurately measuring the complex permittivity of the tested material. The measurement results show that the calculation method of the imaginary part of the Cole-Cole equation has the smallest error in the TM010 mode. The proposed method can solve the problems of large safety hazards and complex solutions in the current measurement of fluid temperature in the pipe.
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2023, Vol. 44 
