Testing device for detecting sugar concentration in liquid

Abstract

The utility model discloses a testing device for detecting sugar concentration in liquid, which comprises a base, a transparent support frame is fixedly connected to the middle of the upper part of the base, a prism box is fixedly connected to the top end of the transparent support frame, a first fixing frame is fixedly connected to one end of the upper part of the base, and a second fixing frame is fixedly connected to the other end of the upper part of the base. The interior of the first fixing frame is rotatably connected with a rotating shaft, the inner side of the rotating shaft is fixedly connected with a light source plate, the rotating shaft is fixedly connected with a first gear, and a clear boundary can be collected on the camera by selecting a proper prism and adjusting the incident angle of a light source. The concentration of the sugar solution can be easily and reversely deduced by calculating the offset of the collected boundary, the device is simple in structure and convenient to miniaturize, and meanwhile, temperature compensation is introduced, so that the tested data can be more accurate.

Description

Technical Field

[0001] The utility model relates to the field of testing devices for detecting sugar concentration in liquid, in particular to a testing device for detecting sugar concentration in liquid. Background Art

[0002] In the sugar industry, how to accurately measure the concentration of sugar solution has always been a problem that has attracted much attention and is expected to be solved. There are many methods and instruments for measuring the concentration of sugar solution, and refractometry is a relatively stable and feasible measurement method.

[0003] Refractometry is mainly to understand the optical properties of a substance by measuring its refractive index, thereby identifying the composition of the substance, determining its concentration, purity, and judging its quality, etc. This method is widely used in the petroleum, pharmaceutical, chemical, sugar, food and other industries.

[0004] However, at present, traditional methods are mostly used in China to measure the refractive index of materials, which has problems such as cumbersome operation and low efficiency, while such instruments abroad are generally expensive.

[0005] Based on the above description, this paper proposes a method for detecting the concentration of sugar solution based on refractometry. This method measures the refractive index of the sugar solution by refractometry, thereby calculating the concentration of the sugar solution. In this process, a temperature compensation algorithm is added to make the detected concentration of the sugar solution more accurate. Utility Model Content

[0006] The purpose of the utility model is to provide a testing device for detecting the sugar concentration in liquid, which solves the problem that the conventional method for measuring the refractive index of a substance in the prior art has the problems of complicated operation and low efficiency, and the problem that such foreign instruments are generally expensive.

[0007] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a test device for detecting the sugar concentration in a liquid, comprising a base, a transparent support frame is fixedly connected to the middle part of the upper part of the base, a prism box is fixedly connected to the top of the transparent support frame, a first fixed frame is fixedly connected to one end of the upper part of the base, and a rotating shaft is rotatably connected inside the first fixed frame;

[0008] A light source plate is fixedly connected to the inner side of the rotating shaft, and a first gear is fixedly connected to the rotating shaft.

[0009] As a further description of the above technical solution: an outer end of the first fixing frame is fixedly connected to a mounting frame, and an upper end of the mounting frame is fixedly connected to a driving motor.

[0010] As a further description of the above technical solution: the output end of the driving motor is fixedly connected to the second gear, and the first gear and the second gear are meshed with each other.

[0011] As a further description of the above technical solution: a second fixing frame is fixedly connected to the other upper end of the base, and a camera is arranged on the inner side of the second fixing frame.

[0012] As a further description of the above technical solution: a circuit board is arranged at one end of the outer side of the second fixing frame, and a flat cable is electrically connected between the camera and the circuit board.

[0013] As a further description of the above technical solution: an NTC resistor is arranged at one end of the bottom of the prism box.

[0014] The utility model has the following beneficial effects:

[0015] 1. Compared with the prior art, this test device for detecting the sugar concentration in liquid can collect clear boundaries on the camera by selecting a suitable prism and adjusting the incident angle of the light source. The offset calculation of the collected boundary can easily infer the concentration of the sugar solution. This device has a simple structure and is easy to miniaturize. At the same time, temperature compensation is introduced to make the test data more accurate.

[0016] 2. Compared with the prior art, the testing device for detecting the sugar concentration in liquid can automatically adjust the angle of the light source plate by setting a driving motor, a first gear and a second gear, thereby improving the practicality and convenience of the entire testing device.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The utility model is further described below in conjunction with the accompanying drawings and embodiments;

[0019] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0020] Figure 2 This utility model Figure 1 Schematic diagram of the structure of A.

[0021] Figure 3 It is a schematic diagram of the structure of the first fixing frame of the utility model.

[0022] Legend:

[0023] 1. Base; 2. First fixing frame; 3. Light source board; 4. Prism box; 5. NTC resistor; 6. Second fixing frame; 7. Camera; 8. Circuit board; 9. Cable; 10. Transparent support frame; 11. First gear; 12. Second gear; 13. Mounting frame; 14. Drive motor; 15. Rotating shaft. DETAILED DESCRIPTION

[0024] This section will describe in detail the specific embodiments of the utility model. The preferred embodiments of the utility model are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the utility model, but it cannot be understood as a limitation on the protection scope of the utility model.

[0025] Reference Figure 1-3 The utility model provides an embodiment of a test device for detecting the sugar concentration in a liquid, comprising a base 1, a transparent support frame 10 is fixedly connected to the upper middle part of the base 1, a prism box 4 is fixedly connected to the top of the transparent support frame 10, and the transparent support frame 10 can stably support the prism box 4 above, a first fixed frame 2 is fixedly connected to one end of the upper part of the base 1, and a rotating shaft 15 is rotatably connected to the inside of the first fixed frame 2;

[0026] The inner side of the rotating shaft 15 is fixedly connected with the light source board 3, and the rotating shaft 15 is fixedly connected with the first gear 11. Under the action of the rotating shaft 15, the light source board 3 can be driven to rotate, and the light source board 3 is installed with a light source that emits light, which is an object that can emit electromagnetic waves in a certain wavelength range (including visible light and invisible light such as ultraviolet rays, infrared rays and X-rays). This device is based on the law of refraction of light. When the incident light is incident from a dense medium (refractive index n1) to a sparse medium (refractive index n2) at an incident angle θ1, the propagation direction of the light will change, and refraction and reflection will occur at the interface between the two media (see Figure 1 ), and follows the following relationship: n1sinθ1=n2sinθ2, where θ1 is the angle of incidence, θ2 is the angle of refraction and θ1<θ2. When the angle of incidence θ1 gradually increases to a certain value, the light passes along the interface, at this time θ2=90°, and the angle of incidence θ1 is called the critical angle θc. If the angle of incidence θ1 is greater than the critical angle θc, the light is no longer refracted to the optical medium, but reflected on the interface. This optical phenomenon is called total reflection. The utility model is designed based on the different critical angles θc caused by different refractive indices of sugar solutions of different concentrations;

[0027] One end of the outer side of the first fixed frame 2 is fixedly connected to a mounting frame 13, and the upper end of the mounting frame 13 is fixedly connected to a driving motor 14, and the output end of the driving motor 14 is fixedly connected to a second gear 12, and the first gear 11 and the second gear 12 are meshed with each other. If the angle of the light source board 3 needs to be adjusted, starting the driving motor 14 can drive the second gear 12 to rotate, and under the action of meshing, it can drive the first gear 11 and the rotating shaft 15 to rotate, so that the angle of the light source board 3 can be adjusted. After adjusting the incident angle θ1 to a certain angle, as θ2 gradually increases to 90°, the refraction phenomenon disappears at this time, and only the total reflection phenomenon exists. The total reflected light passes through the other side of the prism box 4 and refracts out of the prism box 4 again. On both sides of the total reflection critical point, due to the different energy of the light refracted on both sides, an image with a black and white boundary will be left on the camera 7;

[0028] A second fixing frame 6 is fixedly connected to the other end of the upper part of the base 1. A camera 7 is arranged inside the second fixing frame 6. The camera 7 performs binarization processing on the collected image to obtain the pixel value of the boundary value. After the difference between this pixel value and the pixel value of pure water is calculated, the refractive index of the sugar solution at this time can be obtained by the formula, and the concentration of the sugar solution can be inferred based on the obtained refractive index.

[0029] A circuit board 8 is disposed at one end of the outer side of the second fixing frame 6. A flat cable 9 is electrically connected between the camera 7 and the circuit board 8. The flat cable 9 mainly connects the camera 7 and the circuit board 8. The circuit board 8 mainly performs binarization processing on the collected images to obtain the boundary value. At the same time, the collected temperature value can also be calculated in real time, and the collected temperature value can be compensated for the calculation of the refractive index;

[0030] An NTC resistor 5 is provided at one end of the bottom of the prism box 4, because the refractive index of the liquid is inversely proportional to the temperature, that is, the higher the temperature, the smaller the refractive index of the liquid. Therefore, the NTC resistor 5 is introduced into this device to measure the temperature in real time, and the measured refractive index can be compensated for temperature, so as to make the test result more accurate. In addition, the circuit board 8 of the device communicates with the host computer via a serial port. Before testing the concentration of the sugar solution, the host computer should first send a calibration instruction. At this time, pure water is used for calibration. After calibration, the circuit board 8 will store the calibration value for subsequent boundary value calculation. After calibration, the host computer sends a test instruction. At this time, the host computer can test the concentration and refractive index of the sugar solution as well as the current temperature value. At the same time, the above three data can be sent synchronously on the host computer.

[0031] Working principle: When the device is in use, first pour the sugar solution into the interior of the prism box 4. When the light emitted by the light source on the light source board 3 enters the prism box 4, the light will be refracted and reflected at the contact bottom surface of the prism box 4 and the sugar solution. The incident angle and the refraction angle are θ1 and θ2 respectively. At this time, it is necessary to adjust the angle of the light source board 3. Starting the drive motor 14 can drive the second gear 12 to rotate, and under the action of meshing, it can drive the first gear 11 and the rotating shaft 15 to rotate, so as to adjust the angle of the light source board 3. After adjusting the incident angle θ1 to a certain angle, it will gradually increase to 90° as θ2. At this time, the refraction phenomenon disappears, and only the total reflection phenomenon exists. The totally reflected light passes through the other side of the prism box 4 and is refracted out of the prism box 4 again. On both sides of the total reflection critical point, due to the different energies of the light refracted on both sides, an image with a black and white boundary will be left on the camera 7. The camera 7 performs binarization on the collected image and obtains a pixel value of the boundary value. After the difference between this pixel value and the pixel value of pure water is calculated, the refractive index of the sugar solution at this time can be obtained through the formula, and the concentration of the sugar solution can be deduced based on the obtained refractive index.

[0032] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present invention.

Claims

1. A testing device for detecting sugar concentration in a liquid, comprising a base (1), characterized in that: A transparent support frame (10) is fixedly connected to the middle part of the upper part of the base (1), a prism box (4) is fixedly connected to the top of the transparent support frame (10), a first fixed frame (2) is fixedly connected to one end of the upper part of the base (1), and a rotating shaft (15) is rotatably connected inside the first fixed frame (2); The inner side of the rotating shaft (15) is fixedly connected to a light source plate (3), and the rotating shaft (15) is fixedly connected to a first gear (11).

2. A testing device for detecting sugar concentration in liquid according to claim 1, characterized in that: An outer end of the first fixing frame (2) is fixedly connected to a mounting frame (13), and an upper end of the mounting frame (13) is fixedly connected to a driving motor (14).

3. A testing device for detecting sugar concentration in liquid according to claim 2, characterized in that: The output end of the driving motor (14) is fixedly connected to a second gear (12), and the first gear (11) and the second gear (12) are meshed with each other.

4. A testing device for detecting sugar concentration in liquid according to claim 1, characterized in that: The other upper end of the base (1) is fixedly connected to a second fixing frame (6), and a camera (7) is arranged on the inner side of the second fixing frame (6).

5. A testing device for detecting sugar concentration in liquid according to claim 4, characterized in that: A circuit board (8) is provided at one end of the outer side of the second fixing frame (6), and a flat cable (9) is electrically connected between the camera (7) and the circuit board (8).

6. A testing device for detecting sugar concentration in liquid according to claim 1, characterized in that: An NTC resistor (5) is arranged at one end of the bottom of the prism box (4).

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