A method for measuring particle concentration
A measurement method, particle concentration technology, applied in the direction of measurement devices, particle suspension analysis, suspension and porous material analysis, etc., can solve the complex and cumbersome calculation process of the formula, and achieve fast calculation speed, high precision, and wide measurement range Effect
Inactive Publication Date: 2017-07-28
SOUTHEAST UNIV
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Moreover, the calculation process of the formula is complicated and tedious based on the numerical solution of the particle concentration based on the scattering integral method
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[0027] Below in conjunction with accompanying drawing, the present invention is described in detail:
[0028] A method for measuring particle concentration, comprising the steps of:
[0029] Step 1: According to the upper and lower limits of the concentration measurement of the optical system, prepare the standard solution equidistantly, and use the CCD camera to collect the particle scattered light bitmap image corresponding to the concentration value;
[0030] Step 2: Extract the light intensity distribution information from the particle scattering light bitmap image to make neural network training samples. First, read the gray value of each pixel point of the bitmap (that is, the scattered light intensity value falling on a certain point of the image), and normalize it. followed by figure 2 Spot press image 3 As shown, the center of the scattered light spot in the image is taken as the center of the circle, and M concentric rings are divided equidistantly along the rad...
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The invention discloses a method for measuring the particle concentration. The method comprises the following steps: configuring standard solutions with different concentrations, and acquiring particle scattered light bitmap images corresponding to concentration values of the standard solutions; performing light intensity distribution information extraction on the particle scattered light bitmap images, and preparing a neural network training sample; constructing a neural network, and setting the learning rate eta and an expected error of the neural network for training the neural network; identifying a newly sampled scattered light image, obtaining the average value of the total light intensity in each circular ring on the scattered light image, and calculating the particle concentration by taking the obtained average value as input of the trained neural network. Compared with the prior art, the method is wide in range of application to particle concentration measurement, not affected by particle size and distribution restriction conditions, higher in calculation speed, higher in precision and wider in measurement range.
Description
technical field [0001] The invention relates to a method for detecting smoke concentration, in particular to a method for detecting concentration by scattered light of smoke particles. Background technique [0002] Due to air pollution caused by pollution sources such as industrial boilers and coal-fired power plants, environmental problems have increasingly become a huge obstacle to ecological civilization and economic development. Therefore, it is necessary to strictly monitor the concentration of smoke and dust emitted by it. At present, the commonly used measurement methods include light scattering method, light transmission method, charge method, capacitance method and so on. The light scattering method is widely used in online measurement of smoke concentration, which has high measurement accuracy, good repeatability, and fast measurement speed. It is an online direct-reading measurement method without sampling. However, it is limited by the particle size and distrib...
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IPC IPC(8): G01N15/06
Inventor 宋兆龙雷志伟许传龙
Owner SOUTHEAST UNIV