Liquid physical and chemical parameter measuring device based on fluorescence analysis

Abstract

The invention discloses a liquid physical and chemical parameter measuring device based on fluorescence analysis, and belongs to the technical field of measurement. The measuring device disclosed by the invention mainly comprises the following improvements: (1) integrating a plurality of fluorescent sensitive materials which are sensitive to different liquid physical and chemical parameters onto a fluorescent sensitive element, extracting fluorescence which reflects corresponding physical and chemical parameter information by utilizing different bandpass filters, and then analyzing the intensity of the extracted fluorescence, so as to accurately measure the various physical and chemical parameters; (2) additionally arranging a physical defoaming device based on a capillary structure, and combining with an existing chemical defoaming method, so as to effectively eliminate the influence of bubbles in to-be-measured liquid on the measuring accuracy; and (3) performing light path connection among a fluorescence excitation source, the fluorescent sensitive element and a fluorescence receiving module by utilizing a three-port optical circulator, so as to avoid doping coupling between exciting light and the fluorescence, and processing the exciting light and the fluorescence by utilizing an optical fiber collimator, so as to further improve the measuring accuracy.

Description

technical field [0001] The invention relates to a liquid physical and chemical parameter measurement device, in particular to a liquid physical and chemical parameter measurement device based on fluorescence analysis, which belongs to the field of measurement technology. Background technique [0002] The objects of analysis and monitoring in the environment are often trace and ultra-trace substances, and many of them have time and space characteristics, so the requirements for measurement technology are getting higher and higher. With the development of optical sensors, optical measurement methods are widely used in the field of measurement technology. Fluorescence analysis has been developed rapidly in recent years due to its advantages of high sensitivity, low detection limit and good accuracy. For example, this method can be widely used in online water quality monitoring. [0003] Dissolved oxygen is a necessary condition for the survival of aquatic animals and plants. T...

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Problems solved by technology

Since the fluorescence itself is very weak, the reception efficiency of the fluorescence will be greatly reduced

In addition, the main component of bubbles in water also contains oxygen molecules. Aquatic plants produce oxygen through photosynthesis. When the concentration of dissolved oxygen in water is saturated, gas will be precipitated to form bubbles. A large number of bubbles will affect the stability of the dissolved oxygen measurement system. , the measured value of dissolved oxygen concentration contains a part of the concentration of oxygen molecules in the bubbles, resulting in inaccurate measurement results

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