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What is a dust concentration sensor?Article to read

Update: 2020-07-10 15:16 Source: LUFTMY Reading: ↻ News
 

Dust is a solid particle suspended in the air.Traditionally, there are many names for dust, such as dust, dust, soot, mineral dust, sand dust, powder, etc. There is no clear boundary between these nouns.International organization for standardization, particle size less than 75 m of suspended solids defined as dust.The presence of dust in the atmosphere is one of the main reasons for maintaining the earth's temperature, and too much or too little dust in the atmosphere can have a disastrous impact on the environment.But in life and work, productive dust is the natural enemy of human health and the main cause of inducing many kinds of diseases.

What is a dust concentration sensor?Article to read

Hazard of dust

1. Harm to human health

(1) Causing poisoning hazards

The chemical nature of dust is the main factor that harms human body.Because chemical properties determine the extent and speed at which it participates in and interferes with biochemical processes in the body, the nature and magnitude of the harm.Some strong toxic metal dust (chromium, manganese, cadmium, lead, nickel, etc.) into the human body, will cause poisoning and even death.For example, lead causes anemia and damages the brain, manganese, cadmium damages nerves, kidneys, nickel can cause cancer, chromium can cause septal ulcers and perforations, and lung cancer rates increase.In addition, they can directly harm the lungs.Inhalation of manganese dust can cause toxic pneumonia, inhalation of cadmium dust can cause cardiopulmonary insufficiency.Some heavy metal elements in dust are very harmful to human body.

(2) Cause various pneumoconiosis

General dust into the human lungs, may cause a variety of pneumoconiosis.Some non-metallic dust is like silicon, asbestos, carbon black, because suck person human body hind cannot eliminate, will become silicosis, asbestosis or pneumoconiosis.For example, dust containing free silica can be deposited in the alveoli and cause fibrous degeneration, which will harden the lung tissue and cause loss of respiratory function and "Silicon (Silicon) lung" disease.

2. Cause explosion hazard

Explosive dust such as coal dust, aluminum dust and grain dust may explode under certain conditions, causing economic losses and casualties.

3. Environmental pollution

The influence of dust on production is mainly to reduce product quality and machine working accuracy.Products such as photosensitive films, integrated circuits, chemical reagents, precision instruments and micro motors will be reduced or even discarded if they are stained by dust or their rotating parts are worn or stuck.Some factories have suffered many losses due to lax dust control in the production environment.Dust also reduces light and visibility, affecting the field of vision for indoor operations.

Dust sensor

Pm2.5 sensor is also called dust sensor, dust sensor, can be used to detect the concentration of dust in the air around us, namely pm2.5 value.Aerodynamics describes dust less than 10 m in diameter that can enter the alveolar area as respirable dust.Dust particles with diameter above 10 m are mostly deposited by impact, and most of them are deposited in nasopharynx during inhalation, while dust below 10 m can enter deep respiratory tract.Most of the dust deposited in the alveoli was less than 5 m.

PM10 refers to particulate matter with aerodynamic equivalent diameter less than or equal to 10 m in ambient air.PM2.5 fine particles diameter is small, suspended in the atmosphere of the time is long, the spread of distance, and usually contains a lot of poisonous and harmful substances, and therefore more effect to human body health, PM2.5 can enter the lungs, blood, if with bacteria will have a lot of harm to human body, including our respiratory system, cardiovascular system, and even the reproductive system.

The working principle of dust sensor is based on the scattering principle of light. The scattering phenomenon of light is generated by the particles and molecules under the irradiation of light. Meanwhile, part of the energy of the irradiation light is absorbed.When a beam of parallel monochromatic light is incident into the measured particle field, it will be affected by the scattering and absorption around the particle, and the light intensity will be attenuated.Thus the relative attenuation rate of incident light passing through the concentration field to be measured can be obtained.The relative decay rate can basically linearly reflect the relative concentration of dust in the field under test.The intensity of the light is directly proportional to the intensity of the electrical signal through photoelectric conversion. The relative attenuation rate can be obtained by measuring the electrical signal, and then the concentration of dust in the field to be measured can be determined.

Dust sensor is designed to sense dust particles in the air. Inside the sensor, infrared led and phototransistor are placed diagonically. Their optical axes intersect.Phototransistor that it would be able to detect reflected light dust in the air, even very small particles such as tobacco smoke can be detected, infrared leds emit light meets dust produced reflected light, receives the sensor detects the reflected light intensity, the output signal, according to the size of the output signal intensity judge dust concentration, through the output pulse width modulation (PWM) signal to distinguish between two different concentrations of different dust particles.

LD12 Laser PM2.5 Dust Sensor Model

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