Flow field temperature measuring device and method based on femtosecond laser induced chemiluminescence
A chemiluminescence and femtosecond laser technology, applied in the field of laser spectroscopy, can solve problems such as lack of spatial resolution, complex measurement system, and poor measurement accuracy, and achieve high signal-to-noise ratio, high spatial resolution, and high precision.
Pending Publication Date: 2019-03-08
TIANJIN UNIV
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Problems solved by technology
CARS temperature measurement technology has been developed very maturely, with high measurement accuracy, but the measurement system is relatively complex and can only achieve single-point measurement; Rayleigh scattering and filtered Rayleigh scattering temperature measurement technology can obtain two-dimensional temperature field distribution, but the measurement accuracy Relatively poor; TDLAS temperature measurement technology is low in cost and fast in response, but this technology is a path integration measurement method that does not have spatial resolution [6]; PLIF technology can be applied to temperature two-dimensional distribution measurement under complex composition conditions , but this method has significant limitations at high pressure
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[0020] The present invention will be further described below in conjunction with the accompanying drawings.
[0021] Such as figure 1 As shown, the flow field temperature measurement device based on femtosecond laser-induced chemiluminescence includes a flow field to be measured 3, a femtosecond laser 1, a spectrometer 5, a first focusing lens 2, a second focusing lens 4, an ICCD camera 6 and a computer 7 .
[0022] The specific working principle of the device is as follows: the optical filament formed by self-focusing of the femtosecond laser reflected by the femtosecond laser 1 is introduced into the flow field 3 to be measured. The femtosecond laser interacts with carbon and nitrogen-containing gas components and emits spectral line signals containing molecular, atomic, and ion information, in which the spectral line intensity of cyano groups can reflect the temperature information of the flow field. The principle of the signal generation is that the femtosecond laser ind...
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The invention discloses a flow field temperature measuring device and method based on femtosecond laser induced chemiluminescence, the device comprises a to-be-measured flow field, a femtosecond laser, a spectrograph, a first focusing lens, a second focusing lens, an ICCD camera and a computer, the second focusing lens and the spectrograph are sequentially arranged on one side of the to-be-measured flow field, and the spectrograph is connected with the ICCD camera. The femtosecond laser emits femtosecond laser, the femtosecond laser has a self-focusing filamentation effect, and light filamentsare introduced into the to-be-measured flow field containing carbon and nitrogen after passing through the first focusing lens; a chemical reaction is performed under the induction of the femtosecondlaser, a fluorescence signal is emitted, the fluorescence signal is collected by the second focusing lens and enters the spectrograph, and the spectrograph is used for light splitting; and then the ICCD camera records the spectral data after the light splitting and transmits the spectral data to the computer, the computer analyzes and processes the data, and the one-dimensional temperature distribution information of the flow field is inverted. The flow field temperature measuring device has the advantages of no invasion, high spatial resolution, high signal-to-noise ratio, high precision, nointerference, simplicity in calibration and the like.
Description
technical field [0001] The invention belongs to the technical field of laser spectroscopy, and in particular relates to a method for obtaining the one-dimensional temperature of a flow field by using femtosecond laser-induced chemiluminescence technology. Background technique [0002] Accurate measurement of flow field parameters such as temperature, velocity, component concentration, and mass flow rate is crucial for the development of advanced propulsion systems. Among them, accurate measurement of flow field temperature helps to improve combustion efficiency, reduce pollutant emissions and optimize combustion process. At the same time, accurate measurement of flow field temperature can provide accurate experimental data support for computational fluid dynamics (computational fluiddynamics, CFD) simulation software simulation. At present, there are mainly non-optical means and optical means for flow field temperature measurement. [0003] Non-optical means to measure flo...
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IPC IPC(8): G01K11/30
CPCG01K11/30
Inventor 李博朱志峰高强刘吉绪韩磊田轶夫张大源李晓峰
Owner TIANJIN UNIV