A liquid-core optical fiber resonance Raman spectroscopy method for online detection of nitrite

Abstract

The invention provides a method for detecting nitrite on line through liquid core fiber resonance Raman spectrum.The method involves a light source, a reflector path system and a light path receiving processing system.A laser device with the continuously adjustable laser frequency is adopted as the light source.The reflector path system comprises a reflector, a light filter, a focusing lens and a liquid core fiber.The light path receiving processing system comprises a monochrometer, a charge coupled device, a S3C2440 chip and a touch screen.The liquid core fiber is adopted for monitoring a nitrite solution, sampling is not needed, a sample is not damaged, meanwhile, the Raman spectrum strength can be improved by 103 times through the liquid core fiber technology, the Raman spectrum strength can be improved by 106 times by adopting the resonance Raman spectrum technology, the Raman spectrum strength can be improved by 109 times by combining the liquid core fiber technology and the resonance Raman spectrum technology, the S3C2440 chip is used for processing data, a data change track is drawn on the touch screen in real time, manual operation is not needed in the whole process, and the concentration of nitrite in water can be continuously measured on line.

Description

technical field [0001] The invention relates to a method for online detection of nitrite by liquid core optical fiber resonance Raman spectroscopy, which belongs to the technical field of Raman spectroscopy. Background technique [0002] Nitrite is a highly toxic substance and a food additive. It is very similar to salt. Excessive intake of nitrite can cause poisoning and the consequences are very serious. With the rapid development of the aquaculture industry, the breeding density is increasing and the water environment is getting worse. The most prominent problem is the production of toxic substances such as nitrite. Nitrite can cause poisoning in farmed animals. The poisoning mechanism is that the ability of the blood to carry oxygen is weakened, resulting in unobvious growth of fish, abnormal color of the body surface, weakened activity, and slow response. Therefore, it is of great significance to study a fast, real-time online nitrite detection system for the aquacultu...

AI Technical Summary

Problems solved by technology

This method requires the use of a chromogenic reagent to develop the color of the solution, and sometimes requires the consumption of reagents to treat the original water sample, and some reagents are toxic

The measuring instrument of the electrochemical sensor is simple and easy to use, but its detection limit is relatively high and its stability needs to be improved

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