U-shaped biconical fiber biofilm sensor and method of making and measuring

Abstract

The invention discloses a U-shaped biconical fiber optic biofilm sensor and a manufacturing and measuring method. The U-shaped biconical fiber optic biofilm sensor includes a measurement sensing arm and a reference sensing arm. The measurement sensing arm and the reference sensing arm are The multimode optical fiber is characterized in that: the measurement areas of the measurement sensing arm and the reference sensing arm are all set in a U-shape, and the left and right arms of the U-shaped optical fiber all have a taper that is large at the top and small at the bottom; the measurement sensing arm and the The tail ends of the reference sensing arms are all arranged in a hemispherical shape, and the surface of the hemispherical optical fiber cladding is coated with a metal film; the surface of the optical fiber in the measurement area of ​​the reference sensing arm is coated with a polyimide silica hybrid film; the present invention adopts a dual-probe sensor, utilizes a measuring sensing arm and a reference sensing arm to detect biofilm simultaneously, and realizes online accurate measurement of the whole process of biofilm growth; the measurement of the measuring sensing arm and the reference sensing arm The zone adopts U-shaped double-cone structure, which has good application prospects and can be widely used in biology, chemical industry, environmental protection and other fields.

Description

technical field [0001] The invention relates to an optical fiber biofilm thickness sensor, in particular to a U-shaped biconical optical fiber biofilm sensor and a manufacturing and measuring method. Background technique [0002] Photosynthetic bacteria biofilm hydrogen production is a microbial hydrogen production technology that combines biofilm technology with photosynthetic bacteria hydrogen production technology to improve the hydrogen production capacity and stability of the reactor. Studies have shown that microbial cell activity in biofilm is one of the key parameters linking biochemical reaction kinetics and reactor performance. For an uncontrolled biofilm, as the thickness of the biofilm increases, the degradation rate of the biofilm substrate and the activity of metabolic hydrogen production decrease, resulting in a decrease in the hydrogen production rate, light energy conversion efficiency and hydrogen production yield of the reactor; this is because the biologi...

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Problems solved by technology

[0004] Aiming at the problem that existing sensors cannot accurately measure the biofilm thickness in the whole biofilm growth process online, the patent of the present invention proposes to use a U-shaped biconical fiber optic sensor to increase the luminous intensity and transmission depth of the fiber surface to increase the upper limit of sensor measurement, and to use dual probes The sensor (sensing arm and reference arm) can eliminate the influence of liquid phase concentration and composition changes in the biofilm growth process on the measurement of biofilm thickness, so as to realize the online accurate measurement of the whole process of biofilm growth

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