Terahertz pulse measurement-based burning temperature sensing device and method

Abstract

The invention discloses a terahertz pulse measurement-based burning temperature sensing device and a terahertz pulse measurement-based burning temperature sensing method. Laser is emitted from a femtosecond laser device, and is divided into reference laser and detection laser through a beam splitter, the detection laser is focused on a photoconduction antenna type terahertz emitter, terahertz pulses emitted by the terahertz emitter are focused on a ZnTe crystal through an off-axis paraboloid lens group; and the reference layer is collimated and is coincident with terahertz waves focused on the ZnTe crystal after passing through a semi-transmission and self-reflection mirror, parallel grating groups and a polarizing film, the terahertz waves are modulated by using Pockels effect of the ZnTe crystal, and image signals corresponding to collected first reference layer carrying terahertz pulse strength information and second reference laser not carrying the terahertz pulse strength information are input into a computer by a CCD (Charge Coupling Device) detector for subsequence processing. According to the invention, the precision and speed of the non-contact combustion measurement method are increased, and the non-contact measurement of combustion object temperature and temperature distribution is realized.

Description

technical field [0001] The invention belongs to the technical field of combustion detection, and in particular relates to a combustion temperature sensing device and method based on terahertz pulse measurement. Background technique [0002] Combustion phenomena widely exist in many industries such as petrochemical, aerospace, metallurgy and electric power. In the process of combustion reaction, chemical energy is continuously converted into heat energy and electric energy, and heat transfer, mass transfer and chemical reaction process are continuously carried out at the same time. During the combustion process, gas products such as carbon dioxide, carbon monoxide, nitrogen oxides, sulfur dioxide and water vapor are produced and heat is released at the same time. In order to ensure the sustainable development of China's economy, the Chinese government and the scientific and technological circles have paid more attention to the research and application of energy efficiency im...

AI Technical Summary

Problems solved by technology

However, the contact measurement method will disturb the measured object, and its measurement response is often unable to track the rapidly changing temperature, and the sensitive components are easily polluted by high temperature or corrosive gas medium, which reduces reliability

In addition, the contact measurement using a single thermocouple or thermal resistance can only measure a single point, and cannot understand the real situation inside the entire burning object

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