KR20170119585A - PM 2.5 Dust Counter Using Tyndall Effect and Conductivity In Gas and Solution - Google Patents

Abstract

Light scattering is a method of analyzing the molecular weight, size and shape of polymer or colloidal particles by using scattering of light. In the solution, the refractive index is changed by solute Brownian motion, and the incident light is scattered. It was discovered by J. Tyndall, a British physicist, that even a particle that can not be seen by an ordinary microscope can be spotted as a sparkling spot when viewed from the side of the light passage using the Tyndall phenomenon. The size of the particles can be obtained by using the degree of scattering of light as the particle size increases. It is because the smoke of the clear sky appears to be green, and the colloidal solution of gold appears in various colors because the intensity of the scattered light by the Tyndall phenomenon differs depending on the wavelength.

Description

{PM 2.5 Dust Counter Using Tyndall Effect and Conductivity In Gas and Solution}

Fine dust, light sensor, PM2.5

Light scattering  system

When the particle enters the optical chamber, it meets the laser. At this time, scattered light is produced. The particle size is determined by the size of the particle, and the number of particles is determined by measuring the number of the particles.

Advantages :

1) Real-time fine particle measurement is possible.

2) It is possible to measure various size fine dust.

3) Compared to other real-time measurement methods, the cost of measuring instrument is low.

Disadvantages:

1) The specific gravity to particles was not considered

2) An error occurs in the laser light source.

3) Precise particle size separation is difficult.

* Light scattering type fine dust measurement principle

Principle of the above light scattering method Since it performs the weight quantification work for the olfactory size measuring the Romen tenant (ug / m3), it means the mass of the meaningful dust.

 I have tried to make a hole between the computer cooling fan to pass the air through the fine dust filter and to transmit the light to the polluted condition of the filter. When the light sensor was connected to the ammeter after the light sensor was installed on the opposite side, the change of the electric current was highest in the blue laser and in the order of green and red.

Log I _{0 /} I _{t  =} ε CL · · · Beer's Law

here I ₀ is the intensity of the incident light, I _t is the intensity of the transmitted light, and ε is the extinction coefficient. ε is the wavelength of the incident light or the specific constants of the compound. This law is often used to quantify the degree of concentration in the solution phase in chemistry. Even in the filter attached to the computer fan, the transmitted light is transmitted through the CdS light It can be detected by the change of current or voltage according to the illuminance of light even in an element sensor or a solar battery

In the present invention, the methods such as the gross weight method and the beta method, which are carried out by the Ministry of Environment, are complicated and expensive equipment for measurement, and therefore, they are not suitable for use in general households. Therefore, a measurement method considering physicochemical characteristics according to the characteristics of fine dusts will be introduced.

In general, it takes a long time to collect dust of less than 2.5 microns through a filtration device to measure fine dust, and the method of presenting the weight of this dust by weight per cubic meter is the current standard method.

Based on various physico-chemical properties of ultrafine dust (PM2.5), we looked for a scientific and economical way to measure the concentration of fine dust. What kind of cation and anion are in the chemical composition of fine dust The mechanism of fine dust formation was theoretically investigated based on various experiments on how the fine dust was formed by the path. In the present invention, the light scattering is analyzed in the solution and the information on the solubility and the particle size distribution of the complex fine dusts through the difference in the gas phase is investigated.

The weight is calculated by dividing the fine particles (PM10 10 micro-particles or less) using an impactor or a cyclone method, separating up to 2 microns, and calculating the total weight of the collected water. The weight and volume ) ug / m3 Calculates the number of micrograms in the cubic meter. In the light scattering method, when a particle enters the optical chamber, it meets with a laser. At this time, scattered light is produced. The particle size is determined by the size of the particle, and the number of the particle is determined by counting the number of the particle.

1 shows an embodiment of the present invention

Fine dust is a very small particle with a size of 50 micrometers. It consists of various materials such as heavy metal, carbon, and ion. It has a very small size and does not filter through the respiratory tract and penetrates directly into the lungs, causing respiratory illness. In addition, substances such as heavy metals can not be discharged out of the body and accumulate to cause chronic diseases.

In order to cope with the damage caused by such fine dust, it is possible to easily and finely measure the fine dust at home, and to provide a simple and effective device capable of coping with the degree of fine dust. The device is installed in a veranda or an interior space so that it is as convenient as possible to make the fine dust removal device operate according to fine dust.

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Claims (1)

When the air circulation device is circulated in 100ml of distilled water at a constant flow rate and the electric conductivity is measured continuously with time, only the measurement method made by using the principle that fine dust in the air is dissolved in distilled water and electric conductivity is increased.

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