Optical fiber cantilever beam sensor and detection method for food pathogenic bacteria

Abstract

The invention provides an optical fiber cantilever beam sensor for food pathogenic bacteria and a detection method. A single-mode optical fiber is etched by using ultra-short laser pulse and a cantilever beam with a rectangular shape is finally formed on one end face of the single-mode optical fiber; a Fabry-Perot cavity is formed by the cantilever beam and the end face of the single-mode optical fiber; after a process of plating a gold film on the surface, pathogenic antigens to be detected are uniformly adsorbed on the surface of the cantilever beam; the optical fiber cantilever beam sensor is completely immersed into a solution containing pathogenic antigens; the cantilever beam is deformed and bent due to the specific bonding of the antibodies and the antigens; the size of the deformation amount reflects concentration information of the pathogenic bacteria in a solution to be detected; a signal demodulating system takes a common incandescent light bulb as a light source to generate broadband spectral information; the standard Fabry-Perot cavity is formed by one face of the cantilever beam and the end face of the single-mode optical fiber; and lengths of two faces in phase information can be demodulated. The optical fiber cantilever beam sensor has the advantages of high sensitivity, high detection speed and small needed detection samples.

Description

technical field [0001] The invention relates to an optical fiber cantilever beam sensor and a detection method for food pathogenic bacteria. Background technique [0002] Food safety is an important social issue at present. In recent years, there have been an endless stream of safety incidents caused by food quality problems. The main reason is that the microorganisms in the spoiled food are absorbed by the human body to produce a series of adverse reactions. Microorganisms can not only make food spoilage, some microorganisms are also one of the main causes of food poisoning, and this part of microorganisms is called pathogenic bacteria. Food pathogens widely exist in nature (water, soil). If you accidentally ingest food containing or contaminated by food pathogens, food poisoning is likely to occur, including abdominal pain, diarrhea, nausea , vomiting, etc., serious will be life-threatening. In order to ensure food safety, it is particularly important to quickly and ac...

AI Technical Summary

Problems solved by technology

[0003] The above-mentioned technologies and patents generally require complex detection procedures, which consume a lot of manpower and material resources. Even for rapid detection methods, it takes hours or even days to get the results.

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