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What is the difference between infrared PM2.5 sensor and laser dust sensor in air purifier?

Update: 2019-09-18 17:35 Source: LUFTMY Reading: ↻ News
 

At present, in addition to the parameters of some intelligent air purifiers on the market, there are many controversial dust sensors in the intelligent detection part.The two kinds of sensors have their own advantages and disadvantages. What is the difference between infrared PM2.5 sensor and laser dust sensor? How to identify their differences?

Air purifier
Air purifier

The working principle of PM2.5 sensor module of laser dust is based on the scattering principle of light. Particles and molecules will produce light scattering phenomenon under the irradiation of light. At the same time, they also absorb part of the energy of irradiated light. When a beam of parallel monochromatic light enters the measured particle field, it will be affected by scattering and absorption around the particle, and the light intensity will be attenuated. In this way, the relative attenuation rate of incident light passing through the measured concentration field can be obtained. The relative attenuation rate can basically linearly reflect the relative concentration of dust in the field to be measured. The magnitude of light intensity is proportional to the intensity of the electro-optic signal. The relative attenuation rate can be obtained by measuring the electrical signal, and then the dust concentration in the field to be measured can be determined.

LD09 laser dust sensor
LD09 laser dust sensor

Infrared PM2.5 sensor HPD05 uses the principle of optical scattering to measure the dust concentration in the detection range through the conversion of optical path and circuit. HPD05 has the characteristics of small size, high precision, low power consumption, short response time and stable operation under high dust concentration. This PM2.5 infrared dust sensor can be used in air purifier, fresh air system, air conditioning with purification function, PM2.5 detector, etc.PM2.5 infrared dust sensor is designed to detect dust particles in the air. Its inner diagonally placed infrared light emitting diodes and phototransistors intersect their optical axes. When dust-laden air flows through the intersection area of the optical axes, the dust reflects infrared light. The reflected light intensity is proportional to the dust concentration.

HPD05 infrared PM2.5 sensor
HPD05 infrared PM2.5 sensor

LUFTMY sensor has been widely praised in the industry for its measurement accuracy, stability, consistency error, anti-interference and other performance indicators.

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