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Dissolved oxygen online monitoring method and adopted sensor

A dissolved oxygen and sensor technology, applied in the field of sensors, can solve the problems of large volume, high maintenance cost, time-consuming and labor-consuming, etc., and achieve the effects of wide application prospects, strong anti-interference ability and long service life

Inactive Publication Date: 2013-09-25
SHANGHAI INTERNET OF THINGS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the determination of dissolved oxygen content in water is of great significance in many aspects such as industry, medical and health, biology, environment and aquaculture! Traditional laboratory dissolved oxygen measurement methods, such as iodometric method, are time-consuming and labor-intensive in measurement, and cannot achieve real-time data acquisition. Therefore, it is impossible to monitor dissolved oxygen changes in required application fields such as natural water bodies and industrial assembly lines in real time.
At present, domestic and foreign instrument manufacturers have a certain number of dissolved oxygen meters in the market, but most dissolved oxygen meters have disadvantages such as high price, high follow-up maintenance costs of accessories, large volume and inability to realize wireless data transmission.

Method used

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  • Dissolved oxygen online monitoring method and adopted sensor
  • Dissolved oxygen online monitoring method and adopted sensor
  • Dissolved oxygen online monitoring method and adopted sensor

Examples

Experimental program
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Effect test

Embodiment 1

[0039] The structure of the dissolved oxygen online monitoring sensor provided by the present invention is as follows: figure 1 shown. The sensor for on-line monitoring of dissolved oxygen is mainly composed of a light source, a signal acquisition and transmission unit, an optical fiber unit, a sensitive probe unit and the like. The light source and signal acquisition and transmission unit include: data line 1, waterproof connector 2, 1 # Signal acquisition circuit board 3, LED drive circuit board 4, 2 # Signal acquisition circuit board 5, 1 # Photosensitive tube 6, 2 #Photosensitive tube 7, LED light source and heat sink 9; optical fiber unit includes: reference optical fiber 8, 590nm bandpass filter 10, signal optical fiber 11 and light source optical fiber 12; sensitive probe unit includes oxygen sensitive membrane probe 14 and stainless steel shell 13. The three parts are all encapsulated in a stainless steel casing, the optical signal is transmitted through the optic...

Embodiment 2

[0050] Such as image 3 As shown, the structure of the oxygen-sensitive membrane probe of the present invention (that is, the sensor detection probe) is composed of signal optical fiber, light source optical fiber, detection probe optical fiber terminal, sensitive membrane adapter, oxygen molecule sensitive membrane and other components. The excitation light transmitted by the optical fiber of the light source irradiates the sensitive film of oxygen molecules, prompting the sensitive film of oxygen molecules to react with oxygen in water to generate fluorescence, and the signal optical fiber collects the emitted fluorescence and transmits it to the photosensitive tube for photoelectric conversion. All the optical fibers are one component. After the special structural design is carried out according to the application requirements, the present invention is processed and provided by Nanjing Yikun Special Fiber Co., Ltd. The sensitive film adapter is designed and processed accordin...

Embodiment 3

[0052] Such as Figure 4 As shown, the calibration method of the sensor of the present invention is to use a standard dissolved oxygen meter for calibration. Specific steps are as follows:

[0053] 1) Prepare 500mL of pure water in a beaker;

[0054] 2) Initialize the standard dissolved oxygen meter, insert the probe into pure water to detect the initial dissolved oxygen value, the unit is mg / L;

[0055] 3) Then insert the sensor probe of the present invention into the same pure water as described in step 2), turn on the power for testing, and obtain the voltage value of the fluorescence intensity signal, in mV;

[0056] 4) Slowly inject nitrogen gas into the pure water to reduce the concentration of dissolved oxygen in the water body, and use a standard dissolved oxygen meter and the sensor provided by the present invention to simultaneously measure the dissolved oxygen value and voltage value under three concentration conditions;

[0057] 5) Slowly introduce oxygen into t...

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Abstract

The invention relates to a dissolved oxygen online monitoring method and an adopted sensor. The method and the sensor are characterized in that the method and the sensor are based on an oxygen molecule specific sensitive membrane. High-power blue-light-emission LED is adopted as an excitation light source for exciting the sensitive membrane to produce fluorescence with a certain wavelength; signal acquisition is carried out through light filtering and photoelectric tube photoelectric signal conversion. Oxygen concentration in water is proportional to the intensity of detected fluorescence signals. Through optical fiber transmission and fluorescence intensity spectroscopic measurement, the concentration of dissolved oxygen in water can be determined. The specific molecule sensitive membrane is a ruthenium complex. Central wavelength of the fluorescence with a certain wavelength is 590nm. The wavelength of the high-power blue-light-emission LED is 473nm. According to the established online monitoring sensor, LED is adopted as a light source, such that repeated measurements and continuous measurements can be carried out. The oxygen sensitive membrane has high tolerance, high interference resistance, and long service life. The sensor is suitable for water body long-time continuous monitoring, and has wide application prospect in surface water and underground water quality monitoring.

Description

technical field [0001] The invention relates to an online monitoring method for dissolved oxygen and a sensor used. The online monitoring method and the sensor used can be used for rapid online detection and analysis of dissolved oxygen in natural water bodies, and belongs to the technical field of sensors. Background technique [0002] The dissolved oxygen value is a basis for studying the self-purification ability of water. The dissolved oxygen in the water is consumed, and it takes a short time to return to the initial state, which means that the water body has strong self-purification ability, or the water body is not seriously polluted, otherwise it means that the water body is seriously polluted, the self-purification ability is weak, or even loses the self-purification ability. Therefore, the determination of dissolved oxygen content in water is of great significance in many aspects such as industry, medical and health, biology, environment and aquaculture! Tradition...

Claims

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Application Information

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IPC IPC(8): G01N21/64G08C17/02
Inventor 金庆辉陈强赵辉张洹千张菡阁赵建龙
Owner SHANGHAI INTERNET OF THINGS
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