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Comparison of ordinary light source and laser light source used in dust particle counter

日期:2022-08-17 06:23
浏览次数:70
摘要:Comparison of ordinary light source and laser light source used in dust particle counter The dust particle counter is an instrument used to measure the number and particle size distribution of dust particles per unit volume in a clean environment, which is the basis for the evaluation of air cleanliness. It is a product that is very popular now, and it can be widely used for drug inspection institutes in various provinces and cities. The basic principle is that the detection laser of
Comparison of ordinary light source and laser light source used in dust particle counter

 

The dust particle counter is an instrument used to measure the number and particle size distribution of dust particles per unit volume in a clean environment, which is the basis for the evaluation of air cleanliness. It is a product that is very popular now, and it can be widely used for drug inspection institutes in various provinces and cities. The basic principle is that the detection laser of the optical sensor is scattered by the dust particles and is received by the photosensitive element to generate a pulse signal. The pulse signal is output and amplified, and then digital signal processing is performed. parameters are shown.


The light source is the key component of the dust particle counter, which has a great influence on the performance of the instrument. The light source requires high stability, long life, and no interference. The light source of the laser dust particle counter has two kinds of ordinary light source and laser light source. The common light source is iodine tungsten lamp, which is large in size, high in heat generation and short in life. It needs to be preheated after starting up.


It is understood that the light source of the laser dust particle counter has two kinds of ordinary light source and laser light source. The laser dust particle counter using a common light source has a very low response to the signal of particles below 0.3 μm, and the signal amplitude is almost the same as the noise amplitude of the counter itself, and the signal is difficult to detect from the noise. Although such instruments are marked with a channel of 0.3 μm, they are only suitable for measuring particles larger than 0.3 μm, especially above 0.5 μm.


Due to the good monochromaticity of the laser and the stable light energy concentration, the laser dust particle counter using the laser light source has a high signal-to-noise ratio. It is widely used.


It is necessary to say that although the instrument is called a "counter", the ability of the instrument to distinguish the volume of particles is more important. Because the counting of electric pulses is very simple, and it is very important to judge the volume of particles, dust particle counters are used in various provinces and cities drug inspection institutes, blood centers, epidemic prevention stations, disease control centers, quality supervision institutes and other institutions, the electronics industry, pharmaceutical workshops, semiconductors, Production enterprises and scientific research departments such as optical or precision machining, plastics, painting, hospitals, environmental protection, and inspection institutes are particularly important. It allows you to better grasp the air quality and other information, making your life and work more comfortable and comfortable.