Principle of dust particle counter -- how to count the number of dust particles?

Principle of dust particle counter -- how to count the number of dust particles? *The dust particle counter is an instrument for measuring the number and distribution of dust particles in a unit volume in a clean environment It has the characteristics of fast detection speed, high precision and little human influence It has been widely used in Drug Inspection Institute, epidemic prevention station, blood center, pharmaceutical workshop, precision instrument processing, quality supervision institute and other parts 2、 Principle of dust particle counter -- Classification dust particle counter has different classification methods according to different classification standards, which can be divided into small flow counter and large flow counter according to different flow size; according to different volume and shape, it can be divided into hand-held counter and desk counter; According to the different test principle, it can be divided into light scattering test counter, weighing test counter, inertia test counter, microscope test counter, etc.; according to the different number of test channels, it can be divided into single channel counter, dual channel counter and multi-channel counter 3、 Principle of dust particle counter -- structure dust particle counter is mainly composed of five parts: light source, two sets of lenses, measuring cavity, light detector and amplifying circuit Among them, the light source has a great influence on the performance of the counter, which is the key component of the counter It needs to meet the characteristics of long life, high stability and not easy to be interfered by the external environment Two sets of lenses are used to complete the focusing function, * sets are used to focus the light emitted by the light source, * sets are used to focus the scattered light generated by scattering phenomenon The measuring chamber is used to make the particles in the air scatter under the light; The photodetector is used to convert the optical pulse signal into the electrical pulse signal; the amplification circuit is used to amplify the weak electrical signal and select the pulse signal that meets the requirements 4、 Principle of dust particle counter: first, the light from the light source is focused in the measuring chamber through the lens; second, the air passes through the measuring chamber, and the particles in the air are scattered due to the light in the measuring chamber, and the larger the surface area of the particles is, the stronger the intensity of the scattered light is Therefore, the size of the particles can be known by measuring the intensity of the scattered light; Thirdly, the scattered light is essentially the light pulse signal with very weak intensity, which is sent to the photodetector through the lens to convert into the electric pulse signal; after that, the electric pulse signal is processed by the amplification and selection of the amplification circuit to select the required signal, count and display it, so far, the function of the dust particle counter is completed Zhejiang Fuxia Medical Technology Co., Ltd., located in Daoxu Town, Shangyu District, Shaoxing City, Zhejiang Province, is a manufacturer in the purification equipment industry in East China According to iso14644-1 standard, GB50073-2001 national standard and GMP standard, we can provide professional air purification system engineering design, construction, testing and technical services for microelectronics, biomedicine, hospital operating room, optical fiber cable, food and beverage, precision instrument, semiconductor and new material application industries The company's main products are purification bench series, wind shower series, ventilation cabinet series, biosafety cabinet series, dust particle counter, planktonic bacteria sampler, which are widely used in medical and health, electronics, pharmacy, biology, food, agriculture and forestry, animal husbandry and veterinary, inspection and quarantine, aerospace, automobile manufacturing, precision instruments, universities and scientific research institutions Zhejiang Fuxia Medical Technology Co., Ltd is dedicated to serving the global consumers and distributors with our products, humanized services, low prices, and warmly welcome you to join us!