Optical fiber concentration sensor based on optical fiber core ring
Through the optical fiber core ring structure and the principle of optical fiber bending loss, the problem of optical fiber sensor sensitivity to the environment is solved, and low-cost, high-precision solution concentration measurement is achieved, which is suitable for a variety of liquids.
Patent Information
- Application Number
- CN202422577492.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-24
- Publication Date
- 2025-09-19
- Estimated Expiration
- 2034-10-24
AI Technical Summary
Existing fiber optic solution concentration sensors are sensitive to the external environment, especially factors such as vibration, temperature changes and optical noise, resulting in unstable measurement accuracy.
The optical fiber core ring structure is adopted. By stripping the optical fiber cladding and winding it into a ring, the principle of optical fiber bending loss is utilized, combined with semiconductor lasers and photodetectors, to measure the changes in light intensity caused by changes in solution concentration.
It realizes low-sensitivity measurement to the external environment, is simple to operate, low-cost, and is suitable for a wide range of liquid measurements, including transparent solutions, with high measurement accuracy.
Smart Images
Figure CN223362042U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of concentration sensors, in particular to an optical fiber concentration sensor based on an optical fiber core ring. Background Art
[0002] There are many existing approaches to designing fiber-optic solution concentration sensors. Most of these sensors measure concentration based on changes in the photoelectric signal caused by changes in the refractive index of the optical fiber's external environment. However, most of these methods have high environmental requirements, and the device structure is sensitive to factors such as vibration, temperature changes, and optical noise. Utility Model Content
[0003] In response to the above-mentioned deficiencies in the prior art, the utility model provides an optical fiber concentration sensor based on an optical fiber core ring. Its purpose is to address the defect of existing optical fiber sensors that are highly sensitive to the external environment. The optical fiber cladding is stripped off, and then the bare fiber core is wound into a ring and fixed to form a core ring sensor. The optical fiber liquid solution concentration sensing is realized based on the principle of optical fiber bending loss.
[0004] In order to achieve the above-mentioned utility model purpose, the technical solution adopted by the utility model is:
[0005] A fiber optic concentration sensor based on an optical fiber core ring includes an optical fiber sensor, an optical fiber sleeve, a light source, a data acquisition system and a liquid container. The optical fiber sleeve is fixedly arranged in the liquid container, the optical fiber sensor is arranged inside the optical fiber sleeve, the light source is arranged on one side of the optical fiber sleeve, and the data acquisition system is arranged on the side of the optical fiber sleeve away from the light source.
[0006] Furthermore, the optical fiber sleeve is provided with a plurality of evenly distributed liquid holes.
[0007] Furthermore, the optical fiber sensor is an optical fiber core bent into a ring shape.
[0008] Furthermore, the optical fiber sensor is fixed inside the optical fiber sleeve.
[0009] Furthermore, the light source is a semiconductor laser.
[0010] Furthermore, the data acquisition system is a photoelectric detector.
[0011] Furthermore, a liquid filling port is provided on the top of the liquid container.
[0012] Furthermore, a liquid outlet is provided at the bottom of the liquid container.
[0013] Furthermore, a throttle valve is installed on the liquid outlet.
[0014] The beneficial effects of the utility model are:
[0015] The utility model discloses an optical fiber concentration sensor based on an optical fiber core ring, which measures the concentration of a solution by bending an optical fiber and immersing it in a solution. By adjusting the bending radius and number of turns of the optical fiber, the influence of these parameters on the change of light intensity and the measurement accuracy is explored. The device utilizes the bending loss effect of the optical fiber to reflect the change of solution concentration by detecting the change of light intensity. The raw materials of the device are simple to obtain and low in cost, the operation is convenient, no precision equipment is required, and the range of liquids suitable for measurement is wide, and transparent solutions can be measured. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 This is a schematic structural diagram of an optical fiber concentration sensor based on an optical fiber core ring of the present utility model.
[0017] Reference table of accompanying symbols:
[0018] 1. Fiber optic sensor; 2. Fiber optic sleeve; 3. Light source; 4. Data acquisition system; 5. Liquid container; 6. Liquid hole; 7. Liquid injection port; 8. Liquid outlet; 9. Throttle valve. DETAILED DESCRIPTION
[0019] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings, wherein the same components are represented by the same reference numerals.
[0020] It should be noted that the words "front", "rear", "left", "right", "up" and "down" used in the following description refer to directions in the accompanying drawings, and the words "inside" and "outside" refer to directions toward or away from the geometric center of a specific component, respectively.
[0021] In order to make the contents of the present invention more clearly understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention.
[0022] like Figure 1 As shown, an optical fiber concentration sensor based on an optical fiber core ring includes:
[0023] Fiber optic sensor 1: Select a plastic optical fiber with an appropriate bending radius to ensure good transmission performance under bending conditions.
[0024] Fiber optic sleeve 2: A rack that can adjust the bending radius and number of turns, used to fix and adjust the position of the optical fiber.
[0025] Light source 3: semiconductor laser, providing stable and intensity-controllable incident light.
[0026] Data acquisition system 4: Photodetector, used to collect and process the emitted light intensity data.
[0027] Liquid container 5: used to hold the liquid to be tested so that the optical fiber can be completely immersed in the liquid. The container in the device is provided with a liquid injection port 7, a liquid outlet 8 and a throttle valve 9.
[0028] This device uses a pure black box as the liquid container 5 of the sensor solution to be tested to reduce the influence of external light on the experiment.
[0029] A funnel and a disposable infusion set with a throttle valve 9 are used as liquid inlet and outlet devices to reduce the impact of opening the cover to change the liquid on the stability of the system.
[0030] In the optical fiber sleeve 2, cut a section of black plastic sleeve of appropriate length and drill several liquid holes 6 at the upper and lower ends of the sleeve. Select the plastic optical fiber and cut a small section of the center to strip the cladding and coil it into a ring shape. Then, insert the coiled optical fiber into the optical fiber sleeve 2 and fix the optical fiber to both ends of the sleeve with glue to fix the stripped optical fiber core ring part.
[0031] For commonly used liquids (glucose solution, NaCl solution, etc.), the refractive index is proportional to the concentration of the liquid, so the change in liquid concentration is positively correlated with the change in the refractive index of the liquid.
[0032] By measuring the optical power P emitted after the optical fiber is bent, the refractive index change of the liquid to be measured can be inferred, thereby indirectly obtaining the change in the concentration C of the liquid.
[0033] This indicates that changes in the concentration of the liquid to be measured will affect its refractive index, and thus affect changes in the optical fiber output light power, that is, the magnitude of the output light power is inversely correlated with the concentration C of the liquid to be measured.
[0034] Therefore, by measuring the outgoing light power through fiber optic sensing technology and selecting the best fitting function based on the experimental measurement data, accurate measurement of liquid concentration can be achieved.
[0035] The cladding of an optical fiber is stripped off, the core is bent into a ring, and immersed in the liquid to be tested.
[0036] By changing the bending radius of the optical fiber core, the propagation path of light in the optical fiber can be changed, thereby affecting the mode of light transmission in the optical fiber to achieve the purpose of liquid concentration measurement.
[0037] The utility model is an optical fiber concentration sensor based on an optical fiber core ring. The solution concentration is measured by bending the optical fiber and immersing it in the solution. By adjusting the bending radius and number of turns of the optical fiber, the influence of these parameters on the change of light intensity and measurement accuracy is explored. The device utilizes the bending loss effect of the optical fiber and reflects the change of solution concentration by detecting the change of light intensity. The raw materials of the device are simple to obtain and the cost is low. The operation is convenient and does not require precision equipment. It is suitable for measuring a wide range of liquids and can measure transparent solutions.
[0038] The above description is only a preferred embodiment of the present utility model patent and is not intended to limit the present utility model patent. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model patent shall be included in the scope of protection of the present utility model patent.
Claims
1. An optical fiber concentration sensor based on an optical fiber core ring, characterized in that: The invention comprises an optical fiber sensor (1), an optical fiber sleeve (2), a light source (3), a data acquisition system (4), and a liquid container (5); the optical fiber sleeve (2) is fixedly arranged in the liquid container (5); the optical fiber sensor (1) is arranged inside the optical fiber sleeve (2); the light source (3) is arranged on one side of the optical fiber sleeve (2); and the data acquisition system (4) is arranged on a side of the optical fiber sleeve (2) away from the light source (3).
2. The optical fiber concentration sensor based on an optical fiber core ring according to claim 1, characterized in that: The optical fiber sleeve (2) is provided with a plurality of evenly distributed liquid holes (6).
3. The optical fiber concentration sensor based on an optical fiber core ring according to claim 1, characterized in that: The optical fiber sensor (1) is an optical fiber whose core is bent into a ring shape.
4. The optical fiber concentration sensor based on an optical fiber core ring according to claim 3, characterized in that: The optical fiber sensor (1) is fixed inside the optical fiber sleeve (2).
5. The optical fiber concentration sensor based on an optical fiber core ring according to claim 1, characterized in that: The light source (3) is a semiconductor laser.
6. The optical fiber concentration sensor based on an optical fiber core ring according to claim 1, characterized in that: The data acquisition system (4) is a photoelectric detector.
7. The optical fiber concentration sensor based on an optical fiber core ring according to claim 1, characterized in that: The top of the liquid container (5) is provided with a liquid injection port (7).
8. The optical fiber concentration sensor based on an optical fiber core ring according to claim 7, characterized in that: The bottom of the liquid container (5) is provided with a liquid outlet (8).
9. The optical fiber concentration sensor based on an optical fiber core ring according to claim 8, characterized in that: A throttle valve (9) is installed on the liquid outlet (8).