Quasi-distributed optical fiber concentration sensor

A concentration sensor, quasi-distributed technology, applied in the measurement of phase influence characteristics, etc., can solve the problems of high price, difficult operation, and inability to perform real-time monitoring.

CN100541175CInactive Publication Date: 2009-09-16SOUTH CHINA NORMAL UNIVERSITY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2009-09-16
Estimated Expiration
Not applicable · inactive patent

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Abstract

A quasi-distributed optical fiber concentration sensor, which consists of a broadband ASE light source, an optical fiber coupler, a dielectric film filter type wavelength division multiplexer B1~Bn, an optical fiber sensor head G1~Gn, an array waveguide grating, a photodiode probe, an array photoelectric The diode probes T1-Tn, the transmission optical fiber and the circuit processing unit are jointly connected to form a structure. The sensor can realize distributed concentration measurement, has the ability of real-time online and remote detection, large measurement range, high sensitivity, strong stability and convenient operation.
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Description

(1) Technical field

[0001] The invention relates to a quasi-distributed optical fiber concentration sensor, in particular to a quasi-distributed optical fiber concentration sensor system based on Fresnel reflection, which belongs to novel optical fiber sensing technology. (2) Background technology

[0002] The concentration of the solution is one of the main parameters to characterize the characteristics of the solution. In the fields of biochemistry, environmental protection, medical treatment and food processing, the measurement and control of the concentration of the solution plays a very important role in the modern industrial production process. It is to ensure and improve product quality. important technical means. Therefore, many methods for measuring the concentration of solutions have emerged. Traditional measuring instruments include commercial polarimeters, colorimeters, Abbe refractometers, etc., as well as measurement methods such as broadband absorption spectr...

Examples

Embodiment Construction

[0039] exist figure 1 Among them, 1 is a broadband ASE light source, 2 is a fiber coupler, 3 is a photodiode probe, and 4 is a TFF-type dense wavelength division multiplexer DWDM B 1 ~B n , 5 is the optical fiber sensor head G 1 ~G n , 6 is the liquid to be tested, 7 is the transmission fiber, 8 is the array waveguide grating AWG, 9 is the array photodiode probe T 1 ~T n , 10 is a circuit processing unit.

[0040] From figure 1 It can be seen that the quasi-distributed optical fiber concentration sensor based on Fresnel reflection of the present invention consists of a broadband ASE light source, an optical fiber coupler, n dielectric film filter type wavelength division multiplexers B 1 ~B n (respectively with B 1 , B 2 ,...B n Indicates), n optical fiber sensing heads G 1 ~G n (respectively with G 1 , G 2 ,...G n Indicates), arrayed waveguide grating AWG, photodiode probe, array photodiode probe T 1 ~T n (respectively with T 1 , T 2 ,...T n Indicates), th...