Terahertz device for monitoring flame temperature field pulsation in real time and measurement method

Abstract

The invention relates to a terahertz device for monitoring flame temperature field pulsation in real time and a measurement method. The device comprises a laser, a beam splitter, a focusing lens, a parabolic mirror, a reflector, a terahertz generation crystal, a terahertz induction crystal, a frequency locking control system, a signal triggering system, a signal acquisition system, a two-dimensional displacement platform and the like. Laser emitted by the pumping and detection femtosecond laser is divided into pumping frequency locking, pumping measurement and detection frequency locking, detection measurement laser and pumping and detection frequency locking laser through the beam splitter to control the repetition frequency difference of the two lasers. The pumping and detection measurement laser is divided into pumping trigger, pumping test laser and detection trigger by the beam splitter again, the detection test laser, the pumping trigger and the detection trigger laser are used for triggering the data acquisition system, and the pumping test laser is used for generating terahertz waves and interacting with the flame to be detected; the detection test laser is reflected and then is collected by the signal collection system, and the flame information is analyzed by the computer. The method can be applied to unstable combustion detection, and has the characteristics of safety, high signal-to-noise ratio and the like.

Description

technical field [0001] The invention belongs to the technical field of combustion detection, in particular to a terahertz device and a measurement method for real-time monitoring of flame temperature field fluctuations. Background technique [0002] Combustion phenomenon widely exists in many industrial processes such as petrochemical, aerospace, metallurgy and electric power. Flame is the visible form of combustion phenomenon, and flame temperature measurement is a state parameter in the field of combustion diagnosis. Its study is crucial for different forms of heat transfer such as radiation, convection and heat conduction in the combustion process. However, due to the complexity of the flame combustion process, the composition, proportion and combustion conditions of the substances participating in the reaction also change from time to time, so that the combustion state of the flame is constantly changing, and the real-time monitoring of the combustion temperature becomes...

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Problems solved by technology

The contact method has the characteristics of simplicity, intuition, reliability, and high measurement accuracy. However, due to the need to achieve thermal balance during measurement, the measurement response often has a certain hysteresis, and it is difficult to ensure real-time measurement; in addition, the temperature sensing element of the measuring instrument It needs to be in direct contact with the measured object. When measuring high temperature or corrosive substances, it will not only easily cause damage to the temperature sensing element, but also cause disturbance of the measured temperature field, thus affecting the accuracy of the measurement results.

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