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Infrared dust sensors Infrared LEDs are light-emitting diodes whose emission wavelengths are in the infrared range. The common wavelengths are generally around 850nm to 940nm. They are widely used in medical, security, communication, remote control and sensing fields. Since the emitting wavelength of infrared LED is outside the visible spectrum, with the receiver of a specific spectrum, the influence of ambient light on the received signal can be greatly reduced. Thanks to the continuous maturity...

Sensors With the improvement of living standards, people are paying more and more attention to the quality of air, especially now that winter is approaching; there are more and more hazy days. As the main composition of smog, PM2.5 has attracted much attention, and detection equipment for PM2.5 in the air is also emerging one after another. In the current field of detecting dust particles PM2.5, there are mainly two kinds of dust sensors, that is infrared PM2.5 sensors and laser dust sensors.  ...

The dust sensor is mainly used to detect dust concentration in the environment. At present, people have higher and higher requirements for living, working and living environment, and the harm of productive dust to the human body is becoming more and more prominent. The working principle is mainly light absorption, light scattering, β-ray, microcomputer laser and AC electrostatic induction; it is mainly suitable for various research institutions, meteorology, public health, industrial labor...

Environmental issues have always been a hot topic. Environmental protection issues are extremely urgent due to various factors. However, what we are going to discuss today is not environmental protection, but a common pollutant in life, that is PM10. ​​ The dangers of PM10 PM10 is the inhalable particle with a particle size between 2.5 microns and 10 microns that can enter the upper respiratory tract, but some particles can be excreted through sputum, and will also be blocked by the vibrissa in...

3.3 Simulation scene experiment To verify that the sensor element can withstand the extreme changes in environmental conditions during use, the aging experiments of the accelerated sensor device are simulated through low-temperature experiments, high and low-temperature shocks, steady-state damp heat, drop and sweep vibration and other common scene experiments to reflect reliability, and packaging quality of sensors and internal components under continuous or transient environmental conditions....

Therefore, for the formaldehyde sensor in this study, the influence of high temperatures on the sensor is very limited. In the actual transportation, storage or working process of the air conditioner, the sensor can ensure the reliability of continuous operation and storage under extremely high temperatures. For the current commercial formaldehyde sensors 2#, 3#, and 4#, traditional liquid acid-base electrolytes are used as proton conduction media. Under high temperatures, the water in the electrolyte...

Abstract: The working life and long-term stability of electrochemical formaldehyde sensors are the main obstacles restricting the popularization and application of formaldehyde sensors in the field of home appliances. Among them, how to improve the long-term working stability of the internal core components of the formaldehyde sensor is the key problem to solving the current formaldehyde sensor's short service life and poor resistance to external harsh environments. In this study, a formaldehyde...

 A PM2.5 sensor is also called a dust sensor, which can be used to detect the dust concentration in the air around us, that is, the value of PM2.5. Dust with a diameter of less than 10μm that can enter the alveolar region is also commonly referred to as respirable dust in Aerodynamics. Most of the dust particles with a diameter of more than 10μm are deposited by impact, and most of them are deposited in the nasopharynx when inhaled by the human body, while the dust below 10μm can enter...

1. The research status In 1908, Gustav Mie analyzed the scattering of spherical particles according to Maxwell's equations, and first obtained the calculation method of scattering and absorption of spherical particles illuminated by light waves. It provides a solid theoretical basis for the optical study of particulate matter. All walks of life pay more and more attention to the study of particle detection by light scattering. The scattering method has been widely developed since the 1980s....