Laser online sensing device and method for simultaneously measuring turbidity and particle size

Abstract

The invention provides a laser online sensing device and method for simultaneously measuring turbidity and particle size. The laser online sensing device comprises a laser modulation module, a laser, an optical fiber, an optical fiber circulator, an optical fiber focuser, a photoelectric detector, an amplifying and demodulating circuit, an autocorrelator and a computer, and is characterized as follows: by using full-optical fiber type detecting structures of the optical fiber circulator, the optical fiber focuser and the autocorrelator, using the single laser and the photoelectric detector and using integral light intensity variation and autocorrelation characteristics of backward scattered lights, liquid turbidity and particulate size are simultaneously measured online in narrow spaces at a distance. The laser online sensing device and method for simultaneously measuring the turbidity and the particle size, provided by the invention, have the advantages of simple structure, small size and practicability and are suitable for monitoring the liquid turbidity and the particulate size online under complicated environments.

Description

technical field [0001] The invention relates to a laser online sensing device and method for simultaneously measuring turbidity and particle size, and belongs to the technical field of environmental monitoring. Background technique [0002] In the process of water quality analysis, turbidity and particle size are important indicators to reflect the status of water pollution. When the liquid turbidity is high, it is generally accompanied by strong scattering and extinction of particles. With the improvement of productivity and the progress of social civilization, people's research on water turbidity and particulate matter has penetrated into many fields such as petroleum, chemical industry, medicine, and environmental protection. The monitoring and control of water quality turbidity and particulate matter is of great significance to improving production efficiency, controlling environmental pollution, and protecting human health. For example, China stipulates that the turbi...

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Problems solved by technology

Subsequently, the particle size measurement technology based on dynamic light scattering also began to be developed at home and abroad. Because this method only needs a single detector in the process of optical signal acquisition, the complexity of the system is reduced, but it is limited to nano-scale particles in the laboratory. Particle size analysis, the system still cannot meet the needs of online monitoring of particle size in a small space

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