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Double-optical-fiber oxygen sensor

An oxygen sensor and optical fiber sensing probe technology, applied in fluorescence/phosphorescence, material excitation analysis, etc., can solve the problems of increased light source interference and increased energy consumption, achieve rapid response, good stability and repeatability, and expand applications range effect

Inactive Publication Date: 2014-06-18
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology

The enhancement of the light source intensity can indeed increase the fluorescence intensity to a certain extent, but it also increases the interference of the light source to the detection and the increase of energy consumption

Method used

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Embodiment 1

[0019] Such as figure 1 As shown, the present invention is a real-time online fiber optic oxygen sensor, the oxygen sensor is mainly composed of excitation light source 101, excitation optical fiber 102, oxygen fluorescence sensitive film 302, receiving optical fiber 103, optical filter 105, signal receiving and processing system 106.

[0020] The optical fiber sensing probe is composed of a single excitation optical fiber 102 and a single receiving optical fiber 103 whose top ends are in contact with each other. The contact ends of the excitation optical fiber 102 and the receiving optical fiber 103 form an angle of 60 degrees with each other. A probe fixing sleeve assembly is sheathed on the outside of the exciting optical fiber 102 and the receiving optical fiber 103 , the oxygen fluorescence sensitive film 302 is coated on the lower surface of the carrier glass 301 , and the carrier glass 301 is fixed on the detection cell 303 .

[0021] The rear end of the excitation opti...

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Abstract

The invention relates to a double-optical-fiber oxygen sensor. The system adopts a light emitting diode as an excitation light source, excitation light reaches a fluorescent sensitive membrane through transmission of an excitation optical fiber, and produced fluorescent light passes through an optical filter and is collected and transmitted to a photoelectric transducer for detection by a transmitting optical fiber; the excitation optical fiber and the transmitting optical fiber form an inclined angle of 50-70 degrees in an optical fiber oxygen sensor probe, and the dielectric interference can be effectively reduced; the fluorescent light receiving efficiency reaches the maximum and the signal-to-noise (S / N) ratio reaches the maximum when the inclined angle is about 60 degrees; and an oxygen fluorescent sensitive membrane is arranged in the sensor, and therefore the double-optical-fiber oxygen sensor can continuously detect the oxygen content and dissolved oxygen in water online in real time. The double-optical-fiber oxygen sensor has the advantages of long service life, wide measurement range, high sensitivity, good stability and repeatability, simplicity in miniaturization and the like.

Description

technical field [0001] The present invention relates to an optical fiber oxygen sensor, in particular to an optical fiber oxygen sensor for real-time in-body measurement of oxygen content in gas or dissolved oxygen in water. Background technique [0002] The determination of oxygen content in gas and dissolved oxygen concentration in water is very important in the fields of industry, medicine and environment. The traditional oxygen measurement method is the amperometric method (that is, the Clark oxygen electrode method). The oxygen electrode method is mainly detected by the tiny current generated by the consumption of oxygen by the analyte in the electrochemical reaction. This method can realize continuous measurement on site, but it needs to consume oxygen, so it can only measure oxygen in water, and the electrodes used are easily poisoned. The optical oxygen sensor was gradually developed in the mid-1980s. It mainly uses the principle of oxygen fluorescence quenching to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/64
Inventor 陈晨熊艳
Owner SOUTHWEST PETROLEUM UNIV
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