Liquid concentration measuring instrument

Abstract

The utility model discloses a liquid concentration measuring instrument, which relates to the technical field of liquid concentration measurement, and is characterized in that a laser light source is arranged on one side of a triangular prism and emits laser to the triangular prism, one end of an optical fiber is coupled and connected with a laser emitting part of the triangular prism, and a bare core in the middle of the optical fiber is processed and arranged in a solution tank; the optical fiber output end is coupled with the photodiode which is connected with the amplifier, and the voltmeter is connected with the amplifier. According to the utility model, the concentration of a solution can be effectively measured, the laser is introduced into the solution in a three-beam state through the light splitting effect of the triangular prism, the action area of the solution on the optical fiber is increased, and then the light acted by the solution is further converted and amplified by the photodiode and the amplifier, so that the action of the solution on the light is amplified twice, and the concentration of the solution is accurately measured. And finally, the concentration of the solution is accurately reflected in the form of an electric signal, so that the purpose of measuring the concentration of the solution is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to liquid concentration measurement technical field, specifically is a kind of liquid concentration measuring instrument. BACKGROUND

[0002] In the field of liquid concentration measurement, traditional methods usually rely on the changes in physical properties such as density, refractive index or conductivity to indirectly determine the concentration of the liquid. However, these methods are often affected by environmental factors, such as temperature changes, impurities in the solution, etc., which limit the accuracy of the measurement results. With the advancement of technology, especially the development of optical technology, methods for concentration measurement using the principle of laser interaction with matter have gradually emerged.

[0003] Optical fiber is the abbreviation of optical fiber, which is a fiber made of glass or plastic, and can be used as an optical transmission tool. The principle of optical fiber transmission is total reflection of light, which means that when light is incident from a dense medium into a less dense medium, if the incident angle is greater than the critical angle, the light will be completely reflected back to the original medium and will not propagate into the other medium. When the external environmental factors such as temperature, concentration and vibration change, the light wave transmitted in the optical fiber will be modulated by these external physical quantities, so the characteristic parameters of the light wave such as intensity, phase, frequency and polarization state will change accordingly. By detecting the changes of these parameters of the light wave, the information of the measured external quantity can be obtained, realizing the functions of "transmission" and "sensing" of the measured external quantity, which is also the basic principle of optical fiber sensor.

[0004] Optical fiber sensor is a new type of sensor that has developed rapidly with the related technologies of optical fiber communication and optical fiber sensing. This type of sensor has shown great application potential and value in many fields due to its high sensitivity, high precision, good electromagnetic interference resistance, good electrical insulation performance, small transmission loss, large transmission capacity, long service life, distributed measurement, geometric shape plasticity and easy connection with computers and optical fiber transmission systems.

[0005] Existing laser liquid concentration measurement instruments mostly have problems such as complex structure, cumbersome operation, insufficient measurement accuracy, etc. For example, some instruments need to use complex optical systems to ensure accurate transmission and reception of laser light, which not only increases the manufacturing cost of the instrument, but also limits its popularity in practical applications. In addition, some instruments are easily disturbed by environmental factors during measurement, resulting in insufficient stability of the measurement results. UTILITY MODEL CONTENT

[0006] The technical problem to be solved by the utility model is to provide a liquid concentration measurement instrument to realize rapid and accurate measurement of liquid concentration.

[0007] To solve the above technical problems, the utility model provides a technical scheme for a liquid concentration measuring instrument, which comprises a laser light source, a triangular prism, an optical fiber, a solution pool, a photodiode, an amplifier, and a voltmeter.

[0008] The laser light source is arranged on one side of the triangular prism and emits laser light to the triangular prism, one end of the optical fiber is coupled to the laser light emitting part of the triangular prism, the bare core of the middle part of the optical fiber is treated and placed in the solution pool, the output end of the optical fiber is coupled to the photodiode, the photodiode is connected to the amplifier, and the voltmeter is connected to the amplifier.

[0009] Further, the triangular prism divides the single laser beam into three laser beams, and the optical fiber has three optical fibers which are coupled to the laser light emitting parts of the triangular prism, respectively.

[0010] Further, the bare core part of the optical fiber is damaged and treated, and a certain amount of laser light escapes from the damaged part.

[0011] Further, the amplifier is connected to a power supply.

[0012] Further, a reverse voltage source is further included, and the reverse voltage source is connected to the amplifier and the voltmeter.

[0013] Further, the voltmeter has two voltmeters which are connected in parallel, a switch connected to the amplifier is arranged between the two voltmeters, and the reverse voltage source is connected in series with one of the voltmeters.

[0014] Compared with the prior art, the utility model has the advantages that the utility model can effectively measure the concentration of a solution, the laser light is transmitted into the solution in the form of three beams through the light splitting effect of the triangular prism, the action area of the solution on the optical fiber is increased, then the light after the action of the solution is further converted and amplified by the photodiode and the amplifier, the action of the solution on the light is amplified twice, and finally the concentration of the solution is accurately reflected in the form of an electric signal, thereby achieving the purpose of measuring the concentration of the solution. BRIEF DESCRIPTION OF DRAWINGS

[0015] Fig. 1 is a structural schematic view of the liquid concentration measuring instrument of the utility model.

[0016] Fig. 2 is a schematic view of the internal structure of the optical fiber.

[0017] Fig. 3 is a schematic view of the cross-sectional structure of the optical fiber after the bare core treatment.

[0018] As shown in the drawings: 1, laser light source, 2, triangular prism, 3, optical fiber, 4, solution pool, 5, photodiode, 6, amplifier, 7, voltmeter, 8, power supply, 9, reverse voltage source, 10, switch. DETAILED DESCRIPTION

[0019] In the description of the utility model, it needs to understand that the orientation or position relation indicated by the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer", "vertical", "circumferential" and the like is the orientation or position relation based on the orientation or position relation shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as a limitation on the utility model.

[0020] In the utility model, unless explicitly specified and limited, the terms "mounting", "connection", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection or integrally connected; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the communication inside two elements. For ordinary skilled persons in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0021] The utility model discloses a liquid concentration measuring instrument, which further includes a laser light source, a triangular prism, an optical fiber, a solution pool, a photodiode, an amplifier and a voltmeter.

[0022] The utility model discloses a liquid concentration measuring instrument, which further includes a laser light source, a triangular prism, an optical fiber, a solution pool, a photodiode, an amplifier and a voltmeter. Figs. 1-3 The utility model discloses a liquid concentration measuring instrument, which further includes a laser light source, a triangular prism, an optical fiber, a solution pool, a photodiode, an amplifier and a voltmeter.

[0023] The utility model discloses a liquid concentration measuring instrument, which further includes a laser light source, a triangular prism, an optical fiber, a solution pool, a photodiode, an amplifier and a voltmeter.

[0024] Further, the triangular prism 2 of the utility model can accurately divide a single laser beam into three laser beams, which increases the acting area of the solution on the optical fiber 3 and improves the accuracy and reliability of the measurement. Meanwhile, the bare core part of the optical fiber 3 is damaged, so that a certain amount of laser can escape from the damaged part and irradiate the liquid to be measured, further enhancing the interaction between the laser and the liquid and improving the measurement sensitivity.

[0025] In addition, the utility model still is provided with amplifier 6 power supply 8, to ensure that amplifier 6 can work stably, and provide enough amplification factor, simultaneously, the reverse voltage source 9 is introduced, through connecting amplifier 6 with voltmeter 7, can realize the further processing and optimization of the measured signal, improve the accuracy and stability of measurement.

[0026] In the specific implementation, the voltmeter 7 of the utility model can be provided with two and both are in parallel, a switch 10 connecting the amplifier 6 is arranged between the two voltmeters 7, and the reverse voltage source 9 is connected in series with one of the voltmeters 7. In this way, by switching the switch 10, different voltmeters 7 can be selected for reading, thereby realizing flexible processing of the measured signal.

[0027] The specific implementation process of the liquid concentration measuring instrument of the utility model is as follows:

[0028] When the laser light source 1 is turned on, laser light is incident into the three-prism 2 at a certain angle, and through the fold reflection of the three mirror surfaces of the three-prism 2, the original single laser beam is divided into three beams. The one end of the optical fiber 3 is coupled and connected to the laser light emitting part through a coupling mirror, so that the emitted light can enter the optical fiber 3 and be conducted to the output end of the optical fiber 3. Then, a certain part of the optical fiber 3 is bare cored, and the inner and outer cladding layers of the optical fiber 3 are removed by physical or chemical methods, and the inner core of the optical fiber 3 is moderately damaged. At this time, a certain amount of laser light will escape from the damaged part, causing the light intensity at the output end to change. Then, the bare cored part of the optical fiber 3 is connected to the solution pool 4. When the solution pool 4 is filled with a solution, because different concentrations of solutions have different refractive indices and absorption rates of light, the injected solution acts as a refractive cladding layer for the damaged part of the optical fiber 3, and absorbs and refracts the light in the optical fiber 3 to different degrees. Finally, the light intensity at the output end of the optical fiber 3 also changes.

[0029] In order to capture the change of light intensity, a photodiode 5 is coupled to the output end of the optical fiber 3. The light intensity is output in the form of an electrical signal through photoelectric conversion, and the output voltage is displayed on the voltmeter 7 after being amplified by the AD620 amplifier 6. By measuring the photoelectric voltage under different concentrations of solutions, the relationship between the photoelectric voltage and the concentration of the liquid can be fitted. At this time, if a solution with an unknown concentration is injected into the solution pool 4, the concentration can be indirectly calculated based on the relationship.

[0030] In order to prevent the refractive ability of the escaped light being weak due to the low concentration of the liquid, or the absorption of the escaped light being too strong due to the high concentration of the solution, and the output light source intensity being too strong, resulting in the output photoelectric voltage being too high or the output voltage being too low to be measured, or the voltage being too high to exceed the range. The device is additionally provided with a reverse voltage source 9. By superimposing the photoelectric voltage and the reverse voltage, the difference between the two is used to reflect the final output voltage, thereby solving the problem that the output photoelectric voltage is too weak or too strong and the voltmeter 7 cannot display.

[0031] The utility model discloses can effectively measure solution concentration, through the light splitting effect of triangular prism 2, with three beams state into solution with laser, increased the solution to the action area of optical fiber 3, then with photodiode 5 and AD620 amplifier 6 to the light after solution action further conversion and amplification, make the solution for the light effect twice amplification, finally with electric signal form accurately reflect solution concentration, reach the purpose of measuring solution concentration.

[0032] The size and sensitivity of the utility model can be adjusted according to the required precision, but the internal structure and principle remain unchanged.

[0033] The above describes the utility model and its implementation, and this description is not restrictive, and the drawings shown are only one of the embodiments of the utility model, and the actual structure is not limited thereto. In summary, if a person skilled in the art is inspired, without departing from the utility model, without creative design, similar structure and embodiments of the technical solution, which should belong to the protection scope of the utility model.

Claims

1. A liquid concentration measuring instrument, characterized by: It comprises a laser light source (1), a triangular prism (2), an optical fiber (3), a solution pool (4), a photodiode (5), an amplifier (6), a voltmeter (7); The laser light source (1) is arranged on one side of the triangular prism (2) and emits laser light to the triangular prism (2), one end of the optical fiber (3) is coupled and connected with the laser light emitting part of the triangular prism (2), the middle bare core of the optical fiber (3) is treated and placed in the solution pool (4), the output end of the optical fiber (3) is coupled and connected with the photodiode (5), the photodiode (5) is connected with the amplifier (6), and the voltmeter (7) is connected with the amplifier (6).

2. A liquid concentration measuring instrument according to claim 1, characterized in that The triangular prism (2) divides a single laser beam into three laser beams, and the optical fiber (3) is provided with three optical fibers which are respectively coupled and connected with the laser light emitting parts of the triangular prism (2).

3. A liquid concentration measuring instrument according to claim 2, characterised in that: The bare core part of the optical fiber (3) is damaged and a certain amount of laser light is emitted from the damaged part.

4. A liquid concentration measuring instrument according to claim 3, characterised in that: The amplifier (6) is connected with a power supply (8).

5. A liquid concentration measuring instrument according to any one of claims 1-4, characterized in that: It further comprises a reverse voltage source (9) which is connected with the amplifier (6) and the voltmeter (7).

6. A liquid concentration measuring instrument according to claim 5, characterised in that: The voltmeter (7) is provided with two voltmeters which are connected in parallel, a switch (10) which is connected with the amplifier (6) is arranged between the two voltmeters (7), and the reverse voltage source (9) is connected in series with one of the voltmeters (7).

Images