Method for on-line measuring microbe film thickness by optical fibre bragg grating sensor

A grating sensor, fiber optic Bragg technology, applied in the direction of measuring devices, instruments, optical devices, etc., can solve the problem of inability to measure the thickness of microbial film on-line, and achieve high stability, high refractive index sensitivity, and high resolution.

Inactive Publication Date: 2009-03-11
重庆工学院
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Problems solved by technology

[0007] Aiming at the defect that the prior art cannot measure the thickness of microbial film on-line, the technical problem to be solved by the present invention is to provide a method for online measurement of microbial film thickness using a fiber Bragg grating sensor

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  • Method for on-line measuring microbe film thickness by optical fibre bragg grating sensor
  • Method for on-line measuring microbe film thickness by optical fibre bragg grating sensor
  • Method for on-line measuring microbe film thickness by optical fibre bragg grating sensor

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Embodiment Construction

[0029] see Figure 7 , the method for online measurement of microbial film thickness by D-type fiber Bragg grating sensor is carried out as follows:

[0030] Step 1. Calibrate the microbial film thickness d and microbial film refractive index n by Abel refractometer and optical microscope 2 , so as to determine the microbial film refractive index n 2 The relationship function f(n 2 ); that is, to determine d=f(n 2 );

[0031]Step 2, placing a specific D-type fiber Bragg grating sensor in the biofilm trickling filter tower 18; the specific D-type fiber Bragg grating sensor is composed of a photosensitive single-mode fiber 8 and a ceramic substrate 5, wherein the photosensitive single-mode fiber 8 is composed of a core 1, a cladding 2 and a fiber coating 3. The diameter of the core 1 is about 3 μm-4 μm. At the same time, a fiber Bragg grating 6 is written in the photosensitive single-mode fiber 8. The two ends of the ceramic base 5 are respectively provided with two semicir...

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Abstract

The invention discloses an on-line measuring method of microbial film thickness by using a Fiber Bragg Grating (FBG) sensor, which is characterized by comprising the following steps: step one: the microbial film thickness d and a microbial film refractive index n2 are calibrated by the Abell refractometer and an optical microscope, thus determining the relational function f(n2) between the microbial film refractive index n2 and the microbial film thickness, namely, determining that d is equal to f(n2); step two: a given D type FBG sensor is placed in a trickling biofilter; and step three, a broadband laser light source emits broadband laser with the wavelength of 1450nm to 1590nm, the broadband laser is injected into photosensitive single-mode fiber by a fiber optic isolator and transmitted to the D type FBG along the optical fiber after passing through a fiber optic coupler; the laser with the wavelength of Lambda0 positioned at a resonant center is intensely reflected in the D type FBG, the reflected laser is output into a spectrum analyzer by the fiber optic isolator after passing through the fiber optic coupler, and the spectrum analyzer displays the size of the wavelength at the resonant center so as to obtain the refractive index of the microbial film at the moment.

Description

technical field [0001] The invention relates to a method for measuring the thickness of a microbial film, in particular to a method for online measurement of the thickness of a microbial film by an optical fiber Bragg grating sensor. Background technique [0002] Microorganisms with bacteria as the main body will form a microbial film on the surface of the carrier as long as there is a carrier attached to the growth under suitable environmental conditions. People introduce microbial film into industrial organic waste gas treatment through artificial reinforcement technology, thus forming a biofilm reactor. The degradation rate of biofilm reactor to organic waste gas is related to the thickness and density of microbial film in the reactor, and the composition etc.; the total thickness of general biofilm is between 0.07mm and 4mm, and in the treatment of low-concentration organic waste gas (VOCs), the appropriate thickness of microbial film is generally between 70μm and 100μm....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/06
Inventor 赵明富罗彬彬廖强刘江华陈艳
Owner 重庆工学院
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