Flame three-dimensional temperature field measurement imaging device, measuring device and measuring method

Abstract

The invention discloses a flame three-dimensional temperature field measurement imaging device, a flame three-dimensional temperature field measuring device and a flame three-dimensional temperature field measuring method. The imaging device comprises a main lens and a camera detector surface, and is characterized in that a microlens array is arranged between the main lens and the camera detector surface, a virtual focal plane of the microlens array and a virtual image surface of the main lens are coplanar, and the microlens array is used for imaging light rays entering the main lens onto different pixels on the camera detector surface. Compared with the traditional camera, the imaging device provided by the invention can distinguish light ray directions, further establishes a radiation transfer model, obtains a flame three-dimensional temperature field through adopting an inversion algorithm, records radiation information of flame in all directions more accurately, and is more precise in measurement results; and compared with the tomographic technology based on a plurality of cameras, only the single imaging device is needed without using a plurality of cameras, complex synchronization control of the cameras is not required, and the measuring system is simple and easy to implement.

Description

technical field [0001] The invention belongs to the technical field of combustion flame temperature field measurement, and in particular relates to an imaging device, a measuring device and a measurement method for measuring a three-dimensional temperature field of a combustion flame. Background technique [0002] Temperature is one of the main parameters to characterize the combustion flame. The measurement of the three-dimensional temperature field of the flame plays a decisive role in the comprehensive analysis of the combustion reaction speed, three-dimensional structure, component formation, and overall characteristics of the flame. Engineering design improvement and operation optimization will ultimately have great significance for efficient use of energy and low pollution emissions. Therefore, the measurement of the three-dimensional temperature field of the flame is one of the important topics in the study of the combustion flame. [0003] Flame temperature measure...

AI Technical Summary

Problems solved by technology

This method can measure the three-dimensional temperature field of the flame more accurately. However, this method uses a traditional camera to shoot the flame and record the radiation in each direction of the flame. Since the traditional camera cannot distinguish the direction of the light, it will project the same pixel on the detection surface of the camera. A beam of light in different directions is approximated as a ray passing through the optical center of the imaging system, that is, the light connecting the flame, the optical center and the corresponding pixel (pinhole model)

This approximation requires that the distance between the flame and the camera is far enough, and the aperture angle of each imaging ray is small enough, otherwise the approximation error will be large

However, if the flame is far away from the camera, the position resolution of the flame image captured by the camera will inevitably decrease, that is, the size of the part of the flame corresponding to each pixel of the detection surface will increase, and the error of the pinhole model approximation will also increase

Therefore, this method has obvious deficiencies in the recording of the radiation in all directions of the flame.

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