Optical fiber microsensor and detection system for in-situ detecting biological film density distribution

Abstract

The invention discloses an optical fiber microsensor and a detection system for in-situ detecting biological film density distribution. The optical fiber microsensor comprises a glass sleeve, a metal sleeve ring and a single-die optical fiber; an optical resin coating at the front end of the single-die optical fiber is stripped to expose a glass core needle point being about 1mm in length; the metal sleeve ring sleeves 1cm above the point end of the optical fiber; the single-die optical fiber is fixed into the glass sleeve through the metal sleeve ring. The system comprises a light source, a transmission optical fiber, an optical fiber coupler, an incident signal detector, a back scattering signal detector, a signal amplifier, an optical fiber microsensor and a computer. Compared with the traditional method, the optical fiber microsensor has the advantages of being high in resolution ratio, short in response time and high in sensitivity; precise chemical analysis is avoided, so that the measurement result is accurate, the repeatability is high, and the system error is small; the more important is that the in-situ online monitoring can be achieved without damaging a biological film.

Description

technical field [0001] The invention relates to an optical fiber microsensor, in particular to an optical fiber microsensor and a detection system for measuring biofilm density distribution in situ. technical background [0002] Biofilm plays a very important role in water environment restoration and water treatment and purification systems. According to the different types of microorganisms, external shear force, matrix composition and age, biofilm has a complex structure with large differences, which will affect the mass transfer and diffusion mechanism of biofilm. Biofilm density is the most basic data to characterize its structural differences, and it is also the most direct factor affecting mass transfer. The means of measuring biofilm density are very limited. Generally, it is obtained by measuring the dry weight of a known volume of biofilm and then calculating it. The test process will destroy the biofilm, and the result error is large. More importantly, traditiona...

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Problems solved by technology

More importantly, traditional methods can only obtain the average density of the entire biofilm, which cannot accurately reflect the complex changes in its internal structure, let alone online continuous analysis of living biofilms.

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