An optical fiber detector for oil contaminants in water pollution

Abstract

The application provides an oil pollutant optical fiber detector in water pollution, and belongs to the field of measuring equipment, which comprises a sensor, a strain optical fiber, a hydrophobic and oleophilic membrane and an oil-sensitive material. The sensor is a closed hollow combination of an upper circular truncated cone and a lower circular cylinder, the side surface of the circular truncated cone is surrounded by a stainless steel mesh, the hydrophobic and oleophilic membrane covers the entire outer surface of the circular truncated cone part of the sensor, so that a closed cavity is formed in the sensor, and the oil-sensitive material fills the cavity of the sensor. One end of the strain optical fiber is connected with an optical fiber demodulator, and the other end enters the cavity of the sensor. The application can detect the content of oil pollutants in sewage through the optical fiber, has high measurement accuracy, simple structure, small size, is convenient to carry, and is suitable for oil detection in various occasions. In addition, the type of the hydrophobic and oleophilic membrane can be replaced according to the type of the detected oil, various oil detection can be realized, the sensor can be repeatedly used, operation is simple, and the cost is low.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of measuring equipment, in particular to an oil pollutant optical fiber detector in water pollution. BACKGROUND

[0002] Oily sewage is a harmful waste that harms the environment and mainly occurs in the treatment process of oily waste residues generated in the oil exploitation, oil refining, chemical industry and other industries. The sewage contains a large amount of oil and chemicals, which will cause serious pollution to the soil, water and air if not effectively treated. There are some detection devices and methods for the oil content of sewage.

[0003] For example, Chinese invention patent document CN118655289A discloses an oil content detection device in oily sludge water washing process, which uses a solvent to emulsify oil and form an oil-water body, and then separates the oil and water by centrifugal force to detect the oil content. This method needs to add a solvent and use a centrifugal device, which is complicated to operate and has high cost.

[0004] Chinese invention patent document CN103528960A discloses a spectral interference method sewage online monitoring system, which determines the content of suspended solids and oil in water by the interference fringe changes produced by light waves passing through different water qualities. However, the device is large and difficult to move, and can only be used for sampling detection.

[0005] Chinese invention patent document CN104316496B discloses an oil and fat pollutant monitoring device in a high-power laser, which changes the refractive index of micro-nano fiber coating materials to affect the transmission characteristics of surface evanescent waves, thereby meeting the monitoring of oil and fat pollutants. However, the device needs a high-power laser for operation, which has high monitoring cost and certain danger.

[0006] In summary, the existing monitoring devices have limited application range, high cost, and complicated operation, etc. Therefore, the present application designs an oil pollutant optical fiber detector in water pollution. SUMMARY

[0007] The technical problem to be solved by the present application is the defects of the prior art, and the purpose is to accurately sense the oil pollutants in water pollution.

[0008] In order to achieve the above purpose, the present application adopts the following technical solutions.

[0009] An oil pollutant optical fiber detector in water pollution, comprising a protector, a sensor, a weighing disc, a strain optical fiber, a hydrophobic and oleophilic membrane, an oil-sensitive material, an electric heating wire and an optical fiber demodulator.

[0010] The protective sleeve is a hollow cylinder with upper and lower end faces composed of stainless steel gauze; the sensor is a closed hollow combination of an upper circular truncated cone and a lower cylinder, wherein the cylinder part is composed of a stainless steel plate, the upper end face of the circular truncated cone is a stainless steel plate, and the side surface is surrounded by stainless steel gauze; the hydrophobic and oleophilic film covers and is fixed on the entire outer surface of the circular truncated cone part of the sensor, so that a closed cavity is formed in the sensor; the protective sleeve and the sensor are coaxial, the protective sleeve is sleeved on the outside of the sensor, and the upper and lower bottom faces of the two are welded together.

[0011] The weighing disc is placed on the top of the cylinder of the sensor, and the oil-sensitive material is filled in the cavity of the sensor; n+1 lead holes are respectively formed in the top face of the sensor, wherein one lead hole is located at the center of the sensor, and the other n lead holes are uniformly distributed around the center of the sensor; one end of the strain optical fiber is connected to the optical fiber demodulator, and the other end enters the cavity of the sensor through the lead hole at the center of the top face of the sensor and is connected to the upper surface of the weighing disc; the electric heating wire is n, one end of the n electric heating wires is connected to one power supply, and the other end enters the cavity of the sensor through the other lead holes and is connected to the upper surface of the weighing disc.

[0012] Preferably, a gas permeable hole is further formed in the top face of the sensor.

[0013] Preferably, the outer diameter of the weighing disc is 0.1 mm smaller than the inner diameter of the lower cylinder of the sensor, so that the weighing disc can axially stretch and contract in the lower cylinder of the sensor.

[0014] Preferably, the contact between the optical fiber and the lead hole and the contact between the electric heating wire and the lead hole are sealed with sealing materials.

[0015] Compared with the prior art, the beneficial effects of the present application are:

[0016] (1) The present application designs an optical fiber detector for oil pollutants in water pollution, which can detect the content of oil pollutants in sewage through the optical fiber, and has high measurement accuracy.

[0017] (2) The present application has simple structure, small size and is convenient to carry, and is suitable for oil detection in various occasions.

[0018] (3) The present application can replace the type of hydrophobic and oleophilic film according to the type of detected oil, realize various oil detection, and the sensor can be reused, which is simple to operate and low in cost. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 The figure is a structural schematic diagram of the optical fiber detector for oil pollutants in the embodiment of the present application.

[0020] Figure 2 The figure is a structural schematic diagram of the sensor in the embodiment of the present application.

[0021] Figure 3 Enlarged schematic view of the position of the gas guide hole and the lead hole.

[0022] Reference numerals: 1, guard tube; 2, sensor; 3, weighing disc; 4, strain optical fiber; 5, hydrophobic and oleophilic membrane; 6, oil-sensitive material; 7, electric heating wire; 8, gas guide hole; 9, lead hole. DETAILED DESCRIPTION

[0023] The present application will be described in detail below in conjunction with the accompanying drawings and examples.

[0024] Figure 1 Structure schematic view of the oil pollutant optical fiber detector in the embodiment of the present application, Figure 2 Structure schematic view of the sensor in the embodiment of the present application, Figure 3 Enlarged schematic view of the position of the gas guide hole and the lead hole.

[0025] As shown in the above drawings, the present application provides an oil pollutant optical fiber detector in water pollution, which comprises a guard tube 1, a sensor 2, a weighing disc 3, a strain optical fiber 4, a hydrophobic and oleophilic membrane 5, an oil-sensitive material 6, an electric heating wire 7 and an optical fiber demodulator.

[0026] The guard tube 1 is a hollow cylinder with upper and lower end faces composed of stainless steel mesh. The sensor 2 is a closed hollow combination of an upper circular truncated cone and a lower cylinder, wherein the cylinder part is composed of a stainless steel plate, and the upper end face of the circular truncated cone and the side surface are surrounded by a stainless steel mesh. The hydrophobic and oleophilic membrane 5 covers and is fixed on the entire outer surface of the circular truncated cone part of the sensor 2, so that a closed cavity is formed in the sensor 2. The guard tube 1 and the sensor 2 are coaxial, the guard tube 1 is sleeved outside the sensor 2, and the upper and lower bottom faces of the two are welded together.

[0027] The weighing disc 3 is placed on the top of the cylinder of the sensor 2, and the oil-sensitive material 6 fills in the cavity of the sensor 2. The top face of the sensor 2 is respectively provided with n+1 lead holes 9, one of which is located at the center of the sensor 2, and the other n lead holes 9 are uniformly distributed around the center of the sensor 2. One end of the strain optical fiber 4 is connected with the optical fiber demodulator, and the other end enters the cavity of the sensor 2 through the lead hole 9 at the center of the top face of the sensor 2 and is connected with the upper surface of the weighing disc 3. The electric heating wire 7 is n in number, one end of each of the n electric heating wires 7 is connected with a power supply, and the other end enters the cavity of the sensor 2 through the other lead holes 9 and is connected with the upper surface of the weighing disc 3.

[0028] In this embodiment, the top face of the sensor 2 is also provided with a gas guide hole 8.

[0029] In the embodiment, the outer diameter of the weighing disc 3 is 0.1mm smaller than the inner diameter of the lower cylinder of the sensor 2, so that the weighing disc 3 can axially extend in the lower cylinder of the sensor 2.

[0030] In the embodiment, the contact between the optical fiber 4 and the lead hole 9 and the contact between the electric heating wire 7 and the lead hole 9 are both sealed by sealing materials.

[0031] In the embodiment, n=2, the distance between the two electric heating wires 7 and the strain optical fiber 4 is 1cm. The heating wires 7 are connected with the power supply, so that the water in the cavity of the sensor 2 can be heated and removed.

[0032] In the embodiment, the hydrophobic and oleophilic film 5 can be selected and replaced according to the type of oil to be detected.

[0033] In the embodiment, the function of the protection sleeve 1 is to block various objects in water and protect the sensor 2 from erosion.

[0034] In the embodiment, the length of the strain optical fiber 4 can be adjusted to measure different depths of sewage, and the maximum measurement depth is 100m.

[0035] In the embodiment, the hydrophobic and oleophilic film 5 plays a role of water isolation and oil transmission, so that the oil pollutants can more easily enter the inside of the sensor 2.

[0036] In the embodiment, the function of the oil-sensitive material 6 is to adsorb oil pollutants.

[0037] In the embodiment, the weighing disc 3 is made of stainless steel material, so as to prevent oxidation caused by long-term immersion in water and measurement error.

[0038] In the embodiment, the device can be placed in sewage for a long time, so as to realize long-term in-situ real-time monitoring of oil pollutants in water pollution.

Claims

1. An optical fiber detector of oil contaminants in water pollution, characterized by, It includes a protective sleeve (1), a sensor (2), a weighing pan (3), a strain fiber (4), a hydrophobic and oleophilic film (5), an oil-sensitive material (6), an electric heating wire (7), and a fiber optic demodulator; The protective sleeve (1) is a hollow cylinder with upper and lower end faces made of stainless steel mesh; the sensor (2) is a closed hollow assembly with an upper frustum and a lower cylinder, wherein the cylindrical part is made of stainless steel plate, the upper end face of the frustum is made of stainless steel plate, and the side surface is surrounded by stainless steel mesh. The hydrophobic and oleophilic film (5) covers and is fixed on the entire outer surface of the frustum part of the sensor (2), so that a closed cavity is formed inside the sensor (2); the protective sleeve (1) and the sensor (2) are coaxial, the protective sleeve (1) is fitted on the outside of the sensor (2), and the upper and lower bottom surfaces of the two are welded together. The weighing pan (3) is placed on top of the cylinder of the sensor (2), and the oil-sensitive material (6) fills the cavity of the sensor (2). The top surface of the sensor (2) has n+1 lead holes (9), one of which is located at the center of the sensor (2), and the other n lead holes (9) are evenly distributed around the center of the sensor (2). One end of the strain fiber (4) is connected to the fiber demodulator, and the other end enters the cavity of the sensor (2) through the lead hole (9) located at the center of the top surface of the sensor (2) and is connected to the upper surface of the weighing pan (3). There are n electric heating wires (7), one end of each of the n electric heating wires (7) is connected to a power source, and the other end enters the cavity of the sensor (2) through other lead holes (9) and is connected to the upper surface of the weighing pan (3).

2. An optical fiber probe for oil contamination in water pollution according to claim 1, wherein A vent (8) is also provided on the top surface of the sensor (2).

3. The oil contamination in water optical fiber detector according to claim 1, wherein, The outer diameter of the weighing pan (3) is 0.1 mm smaller than the inner diameter of the lower cylinder of the sensor (2), and it can extend and retract axially within the lower cylinder of the sensor (2).

4. The fiber optic detector for oil pollutants in water pollution according to claim 1, characterized in that, The contact points between the optical fiber (4) and the lead hole (9) and the contact points between the electric heating wire (7) and the lead hole (9) were sealed with sealing material.

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