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Preparation of optical fiber pH sensor sensing membrane

A ph sensor and sensitive membrane technology, which is applied in the field of sensor sensitive material preparation, can solve the problems of only 2 to 4 pH values ​​in the detection range, high requirements on process conditions, easy loss of indicators, etc., and achieve good product stability, The effect of low technical requirements for operation and preparation and good reversibility

Inactive Publication Date: 2007-02-07
725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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AI Technical Summary

Problems solved by technology

The former is easy to lose the indicator and has poor repeatability, which limits its development, but the immobilization effect can be improved by selecting a suitable carrier and optimizing the combination of the carrier and the indicator; the latter solves the problem of indicator loss, but the process conditions The requirements are high and need to be further explored
The physical embedding method is relatively easy to implement at present, most of which use silica gel as the carrier to immobilize the indicator, but its detection range is only 2 to 4 pH values

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0014] 1. Take a commercially available communication optical fiber of 40 cm, with an inner and outer core diameter of 62.5 / 125 μm.

[0015] 2. Use a blade to cut off the fiber sheath and coating layer, and the cut length is 4cm.

[0016] 3. Etching the exposed cladding and core with 15% hydrofluoric acid to remove the cladding. The method is: corrode the optical fiber in a hydrofluoric acid solution, and continuously monitor the fiber core diameter with a spiral micrometer (0-25 mm range, resolution 0.01 mm) until it reaches 60 μm, and the corrosion time is 4 hours.

[0017] 4. The core of the optical fiber is made of quartz material, and the corroded core is activated with 35% nitric acid for 30 minutes to form activated hydroxyl groups on the surface of the core.

[0018] 5. Measure 5 mL of tetraethyl orthosilicate (TEOS) and add it to 5 mL of ethanol, then add 10 mg of bromophenol blue, 4 mg of cresol red and 4 mg of chlorophenol red in sequence, and heat and stir the sol...

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PUM

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Abstract

The related preparation method for sensitive film of an optical fiber pH sensor comprises: selecting 30-50cm conventional fiber with inner and outer core diameter rate as 62.5 / 125mum, cutting 2-6cm segment on one end for sleeve and coating layer; corroding with HF to remove the package; activating the fiber core with 20-55% HNO3 for 10-60min to form active (OH)-; by sol-gel method and tetraethyl orthosilicate as precursor, fixing the pH indication molecule on fiber core. This invention is simple and reliable for remote detection.

Description

Technical field: [0001] The invention belongs to the technical field of optical fiber sensing pH value monitoring and relates to a preparation technology of sensor sensitive materials, in particular to a preparation method of optical fiber pH sensor sensitive film. technical background: [0002] Optical fiber sensing technology is a new branch formed with the development of optical fiber communication technology. It has: small size, light weight, flexible shape, anti-electromagnetic interference, and good adaptability to the environment; it belongs to non-contact and non-destructive measurement. Optical fiber sensing technology can be applied to the detection of flammable, explosive, narrow space and corrosive gas, liquid environment and radiation pollution environment. It is a detection technology that cannot be realized or compared with existing mechanical, electromagnetic, electronic and other methods . One of the main methods of traditional measurement of pH value is t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/80
Inventor 董飒英程文华
Owner 725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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