U-shaped biconical optical fiber biological film sensor, and manufacturing and measuring method thereof

Abstract

The invention discloses a U-shaped biconical optical fiber biological film sensor, and a manufacturing method and a measuring method thereof. The U-shaped biconical optical fiber biological film sensor comprises a measurement sensing arm and a reference sensing arm, wherein the measurement sensing arm and the reference sensing arm are multimode optical fibers. The U-shaped biconical optical fiber biological film sensor is characterized in that: measuring regions of the measurement sensing arm and the reference sensing arm are each set to be U-shaped, and each of left and right arms of each U-shaped optical fiber has a taper with a large upper part and a small lower part; tail ends of the measurement sensing arm and the reference sensing arm are each set to be hemispheric-shaped, and the surface of each hemispheric-shaped optical fiber cladding is painted with a metal film; and the optical fiber surface of the measuring region of the reference sensing arm is painted with a polyimide-silica hybrid filtering film. According to the U-shaped biconical optical fiber biological film sensor, the manufacturing method thereof and the measuring method thereof, a double-probe sensor is adopted, the measurement sensing arm and the reference sensing arm are used for detecting a biological film simultaneously, and the online accurate measurement of the whole process of growth of the biological film is realized; and the measuring regions of the measurement sensing arm and the reference sensing arm each adopts a U-shaped double-cone structure, the U-shaped biconical optical fiber biological film sensor has good application prospect, and can be widely used in fields such as biology, chemical engineering and environmental protection.

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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