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System and method for measuring temperature and volume fraction of soot particulate matter based on LED light source

A technology of LED light source and soot particles, which is applied to measuring devices, measuring instrument components, instruments, etc., can solve the problems of great influence on experimental accuracy, complicated optical path, and soot concentration field that does not consider the background effect, so as to simplify the measurement operation. , The system structure is simple, solve the effect of camera overexposure

Active Publication Date: 2022-03-22
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Today, the more common and practical invasive methods include filament thermocouple temperature measurement and electric low-voltage impactor particle analysis, but invasive diagnostic methods are easy to damage the flame structure and affect the measurement of soot particles; non-invasive diagnostic methods, Mostly optical diagnostic methods with ultra-high spatial and temporal resolution, such as dichroism, extinction and tunable diode laser absorption spectroscopy
The traditional method of combining the extinction method and the two-color method to measure the temperature and concentration of soot at the same time, but the experimental accuracy is low, and the experimental optical path and experimental process are complicated, which is not conducive to the development
Among them, the temperature measurement accuracy of the two-color method is lower than that of the three-color method. In the calculation, the emission coefficient adopts a wavelength-related function model, and the error is relatively large. Moreover, the general CCD camera or CMOS camera does not have the function of adjusting the exposure time of red light, green light, and blue light separately. , the signal-to-noise ratio of the processed two-color ratio is low, which has a great impact on the experimental accuracy
The optical path of the traditional extinction method experiment is complicated, and the background effect is not considered in the establishment of the soot concentration field, which has a certain impact on the accuracy of the experiment

Method used

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  • System and method for measuring temperature and volume fraction of soot particulate matter based on LED light source
  • System and method for measuring temperature and volume fraction of soot particulate matter based on LED light source
  • System and method for measuring temperature and volume fraction of soot particulate matter based on LED light source

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Embodiment 1

[0067] Example 1: The present invention provides a system and method for measuring the temperature and volume fraction of carbon cigarette particles based on LED light sources. A system and method based on the temperature and volume fraction of the carbon cigarette particles based on the LED point light source, and the system is a measurement system with optical paths, such as figure 1 (Schematic of the system structure), the combustion device is only drawn from the burner 11.

[0068] In this embodiment, the combustion device is used to select a laminar diffusion combustion device, a laminar flow diffusion burner, a ignition, a gas path of gas and air; gas is used to use ethylene gas, laminar diffusion combustor for providing a combustion temperature of laminar burning flames. Field and carbon smoke concentration field.

[0069] In the measurement system provided with the optical path, the optical path is provided with a power switch 1, an LED point light source 2, a diabet lens ...

Embodiment 2

[0106] Example 2: The present invention provides a system and method for measuring a temperature and volume fraction of a carbon cigarette particle temperature based on an LED light source. This embodiment provides a system and method for measuring the temperature and volume fraction of the carbon cigarette particles based on the LED surface light source. The system is a measurement system with optical path two, is a simplified system for measuring the temperature and volume fraction of carbon cigarette particles; figure 2Indicated. The power switch 1 is connected to the LED surface light source 10, and a neutral density filter 6, a prism camera 8, and a computer 9 are provided in the back sequence of the LED surface light source. When the LED surface light source, neutral density filter, the center height of the prism camera lens is in the same height, which is the height of the flame center on the burner; the installation distance of the LED surface light and the neutral density...

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Abstract

The invention relates to a system and method for measuring the temperature and volume fraction of soot particles based on an LED light source. The system is provided with a combustion device and a light path. The combustion device is provided with a laminar flow diffusion combustor or a turbulent flow combustor; the first light path is provided with an LED point light source, a fly eye lens, two plano-convex lenses, a neutral density filter, a prism camera and a computer. The second light path is provided with an LED area light source, a neutral density filter, a prism camera and a computer. The measurement method comprises the following steps of: calculating the volume fraction of the soot particulate matters by using a light extinction method by using four groups of pictures (1) without flames and with light sources, (2) with flames and with light sources, (3) with flames and without light sources and (4) without flames and without light sources / background, and then calculating the temperature of the soot particulate matters by using a three-color method on the basis of the picture (3) in combination with an absorption coefficient obtained by the light extinction method. The temperature and the volume fraction of soot particles in the combustion process can be accurately measured at the same time. The system is simple in structure, and the measurement method is easy to operate and high in precision.

Description

Technical field [0001] The present invention relates to a system and method for measuring the temperature and volume fraction of the carbon cigarette particles based on the LED light source, and is specifically a carbon-like particulate matter discharge temperature and volume fraction based on the LED point light source or LED surface light. System and measurement method. Background technique [0002] Carbon cigarettes (also known as carbon black, soot) particulate matter is one of the important foundations of smog and PM2.5, and it is also proven to be an important factor in which the greenhouse gas effect is also proven. It is widely derived from various powered equipment (such as internal combustion engines, gas turbines and aerospace engines, etc.). Today, with the development of controlled new combustion modes and post-treatment technologies, internal combustion engine pollutants have been approximated; but relatively, the problem of particulate emissions in gas turbines hav...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D21/02G01D11/00
CPCG01D21/02G01D11/00
Inventor 王潜龙李朝民李振刘海峰郑尊清尧命发
Owner TIANJIN UNIV
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