Laser particle counter is a high-precision measuring instrument mainly used to measure the quantity and distribution of particles in air, gas or liquid (such as oil). The following is a detailed introduction to laser particle counters:
1、 Definition and purpose
Definition: Laser particle counter, also known as Laserparticle counter in English, is an instrument that uses laser technology to detect and count tiny particles suspended in air or liquid streams.
Purpose: This instrument is widely used in environmental protection, medicine, chemical industry, food, aerospace, machinery manufacturing and other fields to monitor the cleanliness of air or liquids, ensure product quality and production environment safety.
2、 Working principle
The working principle of laser particle counter is based on the principle of light scattering. When a laser beam passes through an airflow or liquid flow, particles scatter or absorb the energy of the laser beam, causing a change in the intensity of the laser beam. After receiving these changing signals, the sensors convert them into electrical signals and transmit them to the counter for processing. The counter determines the quantity of particles based on the received electrical signal and classifies and counts them according to the preset particle size range.
Specifically, light from a light source (such as a semiconductor laser) is focused by a lens into the measurement cavity. When every particle in the air rapidly passes through the measurement chamber, it scatters the incident light once, forming a light pulse signal. This optical signal is sent to the photodetector, converted into an electrical pulse signal, and then amplified and screened by the electronic circuit of the instrument to pick out the required signal, which is displayed through the counting system. The scattering phenomenon of particles in the air under light irradiation is related to factors such as particle size, wavelength of light waves, refractive index of particles, and their absorption characteristics of light. The intensity of scattered light from particles increases with the increase of their surface area, so the size of particles can be inferred by measuring the intensity of scattered light.
3、 Selection and usage suggestions
Selection suggestion: When choosing a laser particle counter, factors such as measurement range, measurement accuracy, measurement speed, ease of operation, and price should be considered. Meanwhile, one should choose a brand with good reputation and after-sales service.
Usage suggestion: When using the laser particle counter, follow the operating steps and precautions in the product manual. Regularly maintain and calibrate the instruments to ensure the accuracy and reliability of their measurement results. In addition, attention should be paid to protecting the optical components and sensors of the instrument to avoid contamination and damage.