Liquid spectrum acquisition equipment
By designing a liquid spectrum acquisition device including an optical path system, a liquid constant temperature system and a liquid path system, the problem of low accuracy of the liquid spectrum acquisition device in the prior art is solved, and high-precision and rapid liquid detection are achieved.
Patent Information
- Application Number
- CN202421719589.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Priority Date
- 2023-09-28
- Filing Date
- 2024-07-19
- Publication Date
- 2025-06-13
- Estimated Expiration
- 2034-07-19
AI Technical Summary
In the prior art, the acquisition accuracy of the liquid spectral acquisition equipment is poor, mainly due to the system stability problems caused by the movement of optical path parts and the system temperature fluctuations caused by blowing air to the liquid coils with a fan to constant temperature.
A liquid spectrum acquisition device is designed, including a housing, optical path system, a liquid constant temperature system and a liquid path system. The optical path system is composed of one-point two-point optical fiber, reference acquisition module, two-in-one optical fiber, spectrometer and collimator. The liquid constant temperature system uses a constant temperature box and a water pump to achieve constant temperature. The liquid path system ensures the constant temperature of the liquid through a gas-liquid separator and a regulating valve.
By improving the stability of the optical path and the controllability of the constant temperature of the liquid, the acquisition accuracy of the liquid spectrum acquisition equipment is significantly improved, and the repetition and concentration accuracy are each increased by more than 2 times, reducing the delay of the detection results and improving the accuracy of liquid detection.
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Figure CN222979435U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of near-infrared spectrum detection, in particular to a liquid spectrum acquisition device. Background Technique
[0002] The description of this part only provides background information related to the disclosure of the utility model, and does not constitute the prior art.
[0003] Near-infrared spectrometers can be used to collect the spectra of liquids, so as to analyze the composition of liquids, such as organic substances, inorganic substances, biological macromolecules, etc. The wavelength range of near-infrared spectra can be approximately between 700 and 2500 nm.
[0004] At present, the accuracy of near-infrared spectrometers has always been a technical problem that needs to be solved by those skilled in the art.
[0005] It should be noted that the introduction of the technical background above is only for the convenience of clearly and completely explaining the technical solution of the utility model and facilitating the understanding of those skilled in the art. It cannot be considered that the above technical solutions are well-known to those skilled in the art just because these solutions are described in the background art part of the utility model. Summary of the Utility Model
[0006] Based on the above-mentioned defects of the prior art, the liquid spectrum acquisition device in this application is used to solve the problem of poor accuracy in liquid spectrum acquisition in the prior art.
[0007] After repeated research and tests by the inventor, it is found that the reason for the poor acquisition accuracy of the liquid spectrum device in the prior art is the system stability problem caused by the movement of the optical path parts and the system temperature fluctuation problem caused by using a fan to blow air on the liquid coil to keep it at a constant temperature. The combined effect of these two problems has always made the acquisition accuracy of the liquid spectrum device in an unsatisfactory state.
[0008] To achieve the above object, the present utility model provides the following technical solutions: A liquid spectrum acquisition device, comprising a housing, an optical path system, a liquid constant temperature system and a liquid path system arranged in the housing. Among them, the optical path system includes a light source assembly, a one-to-two optical fiber, a reference acquisition module, a two-in-one optical fiber, a spectrometer, a first input collimator, a first output collimator, a second input collimator and a second output collimator; the light source assembly is connected to the input end of the one-to-two optical fiber, the two output ends of the one-to-two optical fiber are respectively connected to the first input collimator and the second input collimator, the output end of the two-in-one optical fiber is connected to the spectrometer, the two input ends of the two-in-one optical fiber are respectively connected to the first output collimator and the second output collimator, the reference acquisition module includes a reference sample assembly and a switching assembly, the reference sample assembly includes a fixing frame fixedly arranged in the housing, a colorimetric cell and a reference plate fixedly arranged on the fixing frame, the switching assembly includes a switching disk capable of rotating relative to the fixing frame, a collection hole and a standard piece arranged on the switching disk, the first input collimator and the second input collimator are both fixedly arranged on the side of the switching disk facing away from the fixing frame, the first output collimator and the second output collimator are fixedly arranged on the side of the fixing frame facing away from the switching disk, the first input collimator and the first output collimator are arranged opposite to each other and are both arranged opposite to the colorimetric cell; the second input collimator and the second output collimator are arranged opposite to each other and are both arranged opposite to the reference plate; the liquid path system includes a hose bundle communicated with the colorimetric cell, the liquid constant temperature system includes a constant temperature box, the hose bundle is arranged in the constant temperature box, and the liquid spectrum acquisition device has at least a first working state, a second working state and a third working state under the action of the movement of the switching disk. In the first working state, the standard piece and the reference plate are in a facing position; in the second working state, the collection hole and the reference plate are in a facing position; in the third working state, the collection hole and the colorimetric cell are in a facing position.
[0009] Preferably, the liquid spectrum acquisition device further has a fourth working state. In the fourth working state, any one of the reference plate and the colorimetric cell and any one of the standard piece and the collection hole are in a completely staggered position.
[0010] Preferably, the reference plate and the colorimetric cell are arranged in a circumferential direction around the rotation center of the switching disk, and the standard piece and the collection hole are arranged in a circumferential direction around the rotation center of the switching disk.
[0011] Preferably, the hose bundle is arranged circuitously in the constant temperature box.
[0012] Preferably, a gas-liquid separator is arranged between the hose bundle and the colorimetric cell.
[0013] Preferably, the liquid path system includes a liquid inlet pipe and a liquid outlet pipe respectively communicating with the inlet end and the outlet end of the colorimetric cell. The liquid inlet pipe is located below the colorimetric cell, and the liquid outlet pipe is located above the colorimetric cell.
[0014] Preferably, with the rotation center of the switching disk as the center of the circle, a first arc is formed between the center of the collection hole and the center of the colorimetric cell, and a second arc is formed between the center of the standard sheet and the center of the collection hole. The first arc and the second arc coincide.
[0015] Preferably, the aperture of the collection hole is larger than that of the colorimetric cell, and the aperture of the colorimetric cell is larger than those of the standard sheet and the reference plate.
[0016] Preferably, an installation and positioning structure is provided at the output end of the two-in-one optical fiber to ensure that the two fiber cores arranged in the center are aligned with the center of the slit of the spectrometer and are both located at the center position of the slit.
[0017] Preferably, the two fiber cores in the two-in-one optical fiber are closely arranged in the center, and the sum of the fiber diameters of the two fiber cores is smaller than the slit of the spectrometer.
[0018] By means of the above technical solutions, the beneficial effects of the present utility model are as follows:
[0019] 1. The collection accuracy of the spectral collection device is high. For example, the repeatability (stability) is improved by more than 2 times (from the original 0.001 AU to within 0.0005 AU); for another example, the concentration accuracy is improved by more than 2 times (from 1% ± 0.05% to 1% ± 0.01%);
[0020] 2. The optical path stability of the spectral collection device is high;
[0021] 3. Greatly reduce the flow time of the detection optical path of the detected liquid, significantly shorten the delay effect of the detection result, and the result delay is reduced by 1 / 2 (from more than 3 minutes originally to within 1.5 minutes);
[0022] 4. Reduce the influence of the temperature fluctuation of the liquid to be detected on the detection result, and effectively improve the accuracy of the liquid detection result.
[0023] Referring to the following description and the accompanying drawings, specific embodiments of the present utility model are disclosed in detail, indicating the ways in which the principles of the present utility model can be adopted. It should be understood that the embodiments of the present utility model are not limited in scope thereby. Within the spirit and terms of the appended claims, the embodiments of the present utility model include many changes, modifications and equivalents.
[0024] Features described and / or illustrated for one embodiment can be used in the same or similar way in one or more other embodiments, combined with features in other embodiments, or substituted for features in other embodiments.
[0025] It should be emphasized that the term "comprising / includes" as used herein refers to the presence of features, whole things, steps or components, but does not exclude the presence or addition of one or more other features, whole things, steps or components. Brief Description of the Drawings
[0026] The drawings described herein are for illustrative purposes only and are not intended to limit the scope of the disclosure of the present utility model in any way. Additionally, the shapes and proportional dimensions of the components in the drawings are only schematic and are used to assist in understanding the present utility model, rather than specifically defining the shapes and proportional dimensions of the components of the present utility model. Those skilled in the art can, under the teaching of the present utility model, select various possible shapes and proportional dimensions according to specific circumstances to implement the present utility model. In the drawings:
[0027] Figure 1 It is an external schematic view of the front side of the liquid spectral acquisition device in the embodiment of the present application.
[0028] Figure 2 It is an external schematic view of the rear side of the liquid spectral acquisition device in the embodiment of the present application.
[0029] Figure 3 It is a schematic diagram of the internal layout of the liquid spectral acquisition device in the embodiment of the present application.
[0030] Figure 4 It is a schematic diagram of the structure of the key internal layout of the liquid spectral acquisition device in the embodiment of the present application.
[0031] Figure 5 It mainly shows a partial schematic view of the reference acquisition module, etc.
[0032] Figure 6 It mainly shows a partial schematic view of the switching component.
[0033] Figure 7 It mainly shows a partial schematic view of the reference sample component.
[0034] Figure 8 It shows a schematic diagram of the structure of the thermostatic chamber and the hose bundle.
[0035] Figure 9a It shows a schematic diagram of the structure of the gas-liquid separator.
[0036] Figure 9b It shows a schematic diagram of the structure of the gas-liquid separator from another perspective.
[0037] Figure 9c The structural schematic diagram of the gas-liquid separator is shown.
[0038] Figure 10 The schematic diagram of the principle of the liquid constant temperature system and the liquid path system is shown.
[0039] The reference signs of the above-mentioned drawings are as follows:
[0040] 1. Housing; 11. Main body support module; 12. Screen support module; 13. Touch screen; 14. Power supply and communication interface; 15. First liquid inlet interface; 16. First liquid outlet interface; 17. Second liquid inlet interface; 18. Second liquid outlet interface; 19. Support feet
[0041] 2. Optical path system; 21. Light source assembly; 22. One-to-two optical fiber; 23. Reference acquisition module; 231. Motor; 2321. First input collimator; 2322. Second input collimator; 2331. First output collimator; 2332. Second output collimator; 234. Reference sample assembly; 2341. Fixing rack; 2342. Colorimetric cuvette; 2343. Liquid inlet pipe; 2344. Liquid outlet pipe; 2345. Reference plate; 235. Support frame assembly; 236. Switching component; 2361. Switching disk; 2362. Acquisition hole; 2363. Standard piece; 2364. Magnet; 237. Positioning Hall sensor; 24. Two-in-one optical fiber; 25. Spectrometer
[0042] 3. Liquid constant temperature system; 31. Water pump; 32. Constant temperature box; 33. Hose bundle; 34. Temperature sensor
[0043] 4. Electric control assembly
[0044] 5. Liquid path system; 510. Gas-liquid separator; 51. Container body; 52. Regulating body; 53. Exhaust regulating plug; 54. Container indicating piece; 530. Regulating valve Detailed implementation manners
[0045] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
[0046] It should be noted that when an element is referred to as being "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.
[0047] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this utility model belongs. The terms used in the description of this utility model in this specification are only for the purpose of describing specific embodiments and are not intended to limit this utility model. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.
[0048] Each embodiment in this specification is described in a progressive manner. The same or similar parts among the embodiments can be referred to each other, and the differences between each embodiment and other embodiments are emphasized. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the description of the method embodiment.
[0049] It should be noted that in the description of this utility model, the terms "first", "second", etc. are only for descriptive purposes and to distinguish similar objects, and there is no sequence between them, nor can they be understood as indicating or implying relative importance. In addition, in the description of this utility model, unless otherwise specified, the meaning of "a plurality of" includes two or more.
[0050] Refer to Figure 1 、 Figure 2 、 Figure 3 and Figure 4As shown in the figure, an embodiment of the present application discloses a liquid spectral acquisition device, which includes a housing 1, an optical path system 2, a liquid constant temperature system 3, and a liquid path system 5 arranged in the housing 1. Among them, the optical path system 2 includes a light source assembly 21, a one-to-two optical fiber 22, a reference acquisition mold 23, a two-in-one optical fiber 24, a spectrometer 25, a first input collimator 2321, a first output collimator 2331, a second input collimator 2322, and a second output collimator 2332. The light source assembly 21 is connected to the input end of the one-to-two optical fiber 22. The two output ends of the one-to-two optical fiber 22 are respectively connected to the first input collimator 2321 and the second input collimator 2322. The output end of the two-in-one optical fiber 24 is connected to the spectrometer 25. The two input ends of the two-in-one optical fiber 24 are respectively connected to the first output collimator 2331 and the second output collimator 2332. The reference acquisition mold 23 includes a reference sample assembly 234 and a switching assembly 236. The reference sample assembly 234 includes a fixing frame 2341 fixedly arranged in the housing 1, a colorimetric cuvette 2342 and a reference plate 2345 fixedly arranged on the fixing frame 2341. The switching assembly 236 includes a switching disk 2361 capable of rotating relative to the fixing frame 2341, an acquisition hole 2362 and a standard sheet 2363 arranged on the switching disk 2361. The first input collimator 2321 and the second input collimator 2322 are both fixedly arranged on the side of the switching disk 2361 facing away from the fixing frame 2341. The first output collimator 2331 and the second output collimator 2332 are fixedly arranged on the side of the fixing frame 2341 facing away from the switching disk 2361. The first input collimator 2321 and the first output collimator 2331 are arranged opposite to each other and are both arranged opposite to the colorimetric cuvette 2342. The second input collimator 2322 and the second output collimator 2332 are arranged opposite to each other and are both arranged opposite to the reference plate 2345. The liquid path system 5 includes a hose bundle 33 communicated with the colorimetric cuvette 2342. The liquid constant temperature system 3 includes a constant temperature box 32. The hose bundle 33 is arranged in the constant temperature box 32. The liquid spectral acquisition device has at least a first working state, a second working state, and a third working state. In the first working state, the standard sheet 2363 and the reference plate 2345 are in a facing position. In the second working state, the acquisition hole 2362 and the reference plate 2345 are in a facing position. In the third working state, the acquisition hole 2362 and the colorimetric cuvette 2342 are in a facing position.
[0051] With the above structure, in the embodiments of the present application, only by rotating the switching disk 2361 can the switching between various working states be achieved, without the need for optical path components to move as in the prior art to achieve various states. At the same time, in the embodiments of the present application, the water in the constant temperature box 32 is also used to keep the liquid in the spectral acquisition device at a constant temperature, thereby improving the accuracy of component detection.
[0052] Specifically, the liquid spectral acquisition device in the embodiments of the present application includes a housing 1, an optical path system 2, a liquid constant temperature system 3, an electronic control assembly 4, and a liquid path system 5.
[0053] Combined Figure 1 and Figure 2 As shown, the housing 1 is the visible part of the appearance of the liquid spectral acquisition device. The housing 1 may include a main body support module 11, a screen support module 12 provided on the main body support module 11, and a touch screen 13 provided on the screen support module 12. In this embodiment, a power supply and communication interface 14, a first liquid inlet interface 15 for the liquid to be measured, a first liquid outlet interface 16 for the liquid to be measured, a second liquid inlet interface 17 for the constant temperature liquid path system 5, a second liquid outlet interface 18 for the constant temperature liquid path system 5, and support feet 19 for providing support to the device may also be provided on the main body support module 11. Among them, the liquid to be measured can flow in from the first liquid inlet interface 15 and flow out from the first liquid outlet interface 16. The coolant (usually water) can flow into the constant temperature box 32 from the second liquid inlet interface 17 and then flow out from the second liquid outlet.
[0054] Mainly referring to Figure 3 and Figure 4 As shown, the optical path system 2 may include a light source assembly 21, a one-to-two optical fiber 22, a reference acquisition mold 23, a two-in-one optical fiber 24, a spectrometer 25, a first input collimator 2321, a first output collimator 2331, a second input collimator 2322, and a second output collimator 2332. Among them, the light source assembly 21 provides a stable and reliable light source for the optical path system 2. The one-to-two optical fiber 22 has one input end and two output ends. Among them, the light source assembly 21 is connected to the input end of the one-to-two optical fiber 22, and the two output ends of the one-to-two optical fiber 22 are respectively connected to the first input collimator 2321 and the second input collimator 2322 to receive the light in the light source assembly 21 and divide it into two identical optical channels, and the two identical optical channels are respectively connected to the reference acquisition mold 23 through the first input collimator 2321 and the second input collimator 2322.
[0055] The two-in-one optical fiber 24 has two input ends and one output end. The output end of the two-in-one optical fiber 24 is connected to the spectrometer 25, and the two input ends of the two-in-one optical fiber 24 are respectively connected to the first output collimator 2331 and the second output collimator 2332 to connect the output collimator to the spectrometer 25. The two fiber cores in the two-in-one optical fiber 24 are closely arranged in the center, and the sum of the diameters of the two fiber cores is smaller than the slit of the spectrometer 25. The output end of the two-in-one optical fiber 24 is provided with an installation and positioning structure to ensure that the two fiber cores arranged in the center are aligned with the center of the slit of the spectrometer 25 and are both located at the center position of the slit.
[0056] As shown in combination Figure 5 shown, the reference collection mold 23 includes a motor 231 controlled by the electric control assembly 4, a reference sample assembly 234, and a switching assembly 236.
[0057] As shown in combination Figure 7 shown, the reference sample assembly 234 includes a fixing frame 2341, a cuvette 2342 and a reference plate 2345 fixedly arranged on the fixing frame 2341. The fixing frame 2341 is used to fixedly support the cuvette 2342, the liquid inlet pipe 2343 (detailed below), the liquid outlet pipe 2344 (detailed below) and the reference plate 2345, and at the same time forms a sealed detection liquid path channel with the liquid inlet pipe 2343, the cuvette 2342, the liquid outlet pipe 2344, etc. The material of the reference plate 2345 is exactly the same as that of the cuvette 2342, and both are transparent optical glasses that meet the optical path requirements.
[0058] As shown in combination Figure 6 shown, the switching assembly 236 includes a switching disk 2361, a collection hole 2362 arranged on the switching disk 2361, and a standard piece 2363. The switching disk 2361 can rotate around a central axis driven by the motor 231, and the collection hole 2362 (this hole is only a through hole with a suitable size) on it can be aligned with the cuvette 2342 or the reference plate 2345 under program control. The standard piece 2363 can be rotated to be aligned with the reference plate 2345 under program control.
[0059] As shown in combination Figure 5As shown, both the first input collimator 2321 and the second input collimator 2322 are fixedly arranged on one side of the switching disk 2361 facing away from the fixed frame 2341. The first output collimator 2331 and the second output collimator 2332 are fixedly arranged on one side of the fixed frame 2341 facing away from the switching disk 2361. The first input collimator 2321 and the first output collimator 2331 are arranged opposite to each other, that is, the first input collimator 2321 and the first output collimator 2331, and both are arranged opposite to the cuvette 2342. The second input collimator 2322 and the second output collimator 2332 are arranged opposite to each other, that is, the second input collimator 2322 and the second output collimator 2332, and both are arranged opposite to the reference plate 2345.
[0060] The spectrometer 25 is used to receive optical signals and output spectral data. The spectrometer 25 may include a thermostat, so as to reduce the influence of the external temperature on the temperature of the spectrometer 25.
[0061] Combined with Figure 10 As shown, the liquid constant temperature system 3 includes a constant temperature box 32 and a water pump 31 for introducing the coolant from the second liquid inlet interface 17 into the constant temperature box 32. The liquid discharge port of the constant temperature box 32 is communicated with the second liquid outlet interface 18. The constant temperature box 32 is also provided with a temperature sensor 34 at its liquid discharge port. When the temperature sensor 34 senses that the temperature of the constant temperature liquid is higher or lower than the set range, the electronic control assembly 4 controls the start and stop of the water pump 31 (the electronic control assembly 4 can also control the water pump 31 to work continuously), so as to take away the heat or cold of the liquid to be measured in the hose bundle 33 and achieve the purpose of constant temperature. Preferably, the constant temperature liquid in the constant temperature box 32 can be provided by a constant temperature container located outside the housing 1.
[0062] The liquid path system 5 can input the liquid to be measured into the cuvette 2342 from the first liquid inlet and flow out from the first liquid outlet. The liquid to be measured can be a pure transparent liquid or a non-sticky transparent liquid containing bubbles. Specifically, the liquid to be measured can enter the hose bundle 33 in the constant temperature box 32 through the first liquid inlet interface 15 for constant temperature treatment and then enter the gas-liquid separator 510. Combined with Figure 9a 、 Figure 9b and Figure 9cAs shown, the gas-liquid separator 510 includes a container body 51, a regulating body 52, an exhaust regulating plug 53, and a container indicating piece 54. The liquid to be measured enters from the liquid inlet end on the side of the gas-liquid separator 510. Both the liquid inlet end and the upper outlet end are located on the container body 51 and are as close as possible to the upper part of the container body 51. Affected by gravity, the liquid is in the regulating body 52 at the bottom. A radial sealing method is used between the container body 51 and the regulating body 52, as well as between the exhaust regulating plug 53. In this way, the regulating body 52 and the exhaust regulating plug 53 can be adjusted according to indicators such as the gas content and delay sensitivity of different liquids to be measured. For convenient quantitative adjustment, scales are set on the regulating body 52 and the exhaust regulating plug 53. And the regulating body 52 indicates the value through the container indicating piece 54. The exhaust regulating plug 53 reads the value by observing the scale leaking outside the side.
[0063] The liquid to be measured flowing out from the regulating body 52 at the bottom of the gas-liquid separator 510 enters the liquid inlet pipe 2343 of the cuvette 2342 through a pipe from the lower part of the reference sample assembly 234, and then flows out from the liquid outlet pipe 2344 of the cuvette 2342. After that, it converges with the gas-liquid mixture output from the upper part of the gas-liquid separator 510 into a tee joint and finally is discharged out of the device through the regulating valve 530. Preferably, the liquid inlet pipe 2343 is located on the lower side of the cuvette 2342, and the liquid outlet pipe 2344 is located on the upper side of the cuvette 2342 to prevent the gas in the pipe from not being completely discharged during the first liquid passing.
[0064] The electric control assembly 4 is the integration of power supply, control, data transmission, interaction, etc. of the device, and includes a control board, an interface board (including power supply and communication interfaces 14), a touch screen 13, a switch, a collection button, etc.
[0065] In a preferred embodiment, the reference collection mold 23 may further include a support frame assembly 235. Among them, the fixed frame 2341, the motor 231, and the positioning Hall sensor 237 are all fixedly arranged on the support frame assembly 235. And the first input collimator 2321 and the first output collimator 2331 are fixedly arranged opposite to each other on both sides of the support frame assembly 235, and the second input collimator 2322 and the second output collimator 2332 are fixedly arranged opposite to each other on both sides of the support frame assembly 235.
[0066] In a preferred embodiment, a magnet 2364 is arranged on the switching disk 2361, and a positioning Hall sensor 237 is fixedly arranged on the support frame assembly 235. The magnet 2364 can cooperate with the positioning Hall sensor 237 to achieve the purpose of determining the position of the switching disk 2361.
[0067] In summary, the optical path passing through the cuvette 2342 is called the sample collection optical path, and the optical path passing through the reference plate 2345 is called the reference optical path; the switching assembly 236 can make the light of at most one optical path in the sample collection optical path and the reference optical path pass through normally to prevent interference.
[0068] The liquid spectrum acquisition device has at least several working states:
[0069] 1. Optical path calibration: In the first working state, after the electrical control assembly 4 locates the Hall sensor 237 and confirms the position, it controls the motor 231 to drive the switching disk 2361 to rotate, so that the standard plate 2363 and the reference plate 2345 are in a facing position, and then the light of the light source assembly 21 is transmitted through the one-to-two optical fiber 22 and the second input collimator 2322, through the standard plate 2363, the reference plate 2345, through the second output collimator 2332 and the two-in-one optical fiber 24, and then received by the spectrometer 25, so as to achieve the calibration purpose; at this time, the light in the reference optical path is in a normal passing state.
[0070] 2. Optical path reference sampling: In the second working state, after the electrical control assembly 4 locates the Hall sensor 237 and confirms the position, it controls the motor 231 to drive the switching disk 2361 to rotate, so that the collection hole 2362 and the reference plate 2345 are in a facing position, and then the light of the light source assembly 21 is transmitted from the one-to-two optical fiber 22 and the second input collimator 2322, through the collection hole 2362, the reference plate 2345, and then through the second output collimator 2332 and the two-in-one optical fiber 24, and is received by the spectrometer 25 to achieve the purpose of reference sampling; at this time, the light in the reference optical path is in a normal passing state.
[0071] 3. Optical path dark current collection: In the fourth working state, after the electric control assembly 4 locates the Hall sensor 237 to confirm the position, the control motor 231 drives the switching disk 2361 to rotate, so that the switching disk 2361 completely cuts off the light transmission between the first collimator and the first output collimator 2331 and the light transmission between the second collimator and the second output collimator 2332, so as to realize the collection of dark current. At this time, both the reference plate 2345 and the cuvette 2342 are staggered with the standard plate 2363 or the collection hole 2362. As a result, the light in the sample collection optical path and the reference optical path is in a non-passing state.
[0072] 4. Spectral acquisition of the liquid to be tested: In the third working state, after the optical path is calibrated, dark current and reference are collected, the electronic control assembly 4 controls the motor 231 to drive the switching disk 2361 to rotate after the Hall sensor 237 is positioned to confirm the position, so that the collection hole 2362 and the cuvette 2342 are in a facing position, and then the light of the light source assembly 21 is transmitted by the one-to-two optical fiber 22 and the first input collimator 2321, through the collection hole 2362, the cuvette 2342 and the treated pure transparent liquid in the cuvette 2342, and after passing through the first output collimator 2331 and the two-in-one optical fiber 24, it is received by the spectrometer 25, and the spectrometer 25 then outputs the spectrum of the liquid to be tested.
[0073] As can be seen from the above working process, the optical path of this device is switched only by the rotation of the switching disk 2361. It has fewer moving parts and no movement of optical path components. Therefore, the optical path of this spectral acquisition system has high stability. The constant temperature system of this device uses the liquid constant temperature method, which has good effects. The length of the hose bundle 33 required is shorter than that of the fan blowing coil tube method. Moreover, the gas-liquid separator 510 uses an adjustable capacity method to adjust the appropriate volume as much as possible (reduce unnecessary volume). In this way, the flow time of the detection optical path of the detection liquid is greatly reduced, and the delay of the detection result is significantly shortened. At the same time, in the liquid constant temperature system 3 of this device, the hose bundle 33 is completely immersed in the constant temperature liquid, which has better effects and more controllable temperature than the constant temperature method of blowing air by the fan to the coil tube for transporting the liquid to be measured. In this way, the influence of the temperature fluctuation of the liquid to be measured on the detection result is reduced, and the accuracy of liquid detection is effectively improved.
[0074] In this embodiment, the reference plate 2345 and the cuvette 2342 are arranged in a circumferential direction around the rotation center of the switching disk 2361, and the standard plate 2363 and the collection hole 2362 are arranged in a circumferential direction around the rotation center of the switching disk 2361. Preferably, with the rotation center of the switching disk 2361 as the center of the circle, a first arc is formed between the center of the collection hole 2362 and the center of the cuvette 2342, and a second arc is formed between the center of the standard plate 2363 and the center of the collection hole 2362, and the first arc and the second arc coincide. Preferably, the aperture of the collection hole 2362 is larger than the aperture of the cuvette 2342, and the aperture of the cuvette 2342 is larger than the apertures of the standard plate 2363 and the reference plate 2345.
[0075] The present utility model has the following advantages:
[0076] 1. The acquisition accuracy of the spectral acquisition device is high. For example, the repeatability (stability) is improved by more than 2 times (from the original 0.001 AU to within 0.0005 AU); for another example, the concentration accuracy is improved by more than 2 times (from 1% ± 0.05% to 1% ± 0.01%);
[0077] 2. The optical path of the spectral acquisition device has high stability;
[0078] 3. The flow time of the detection optical path of the detection liquid is greatly reduced, and the delay effect of the detection result is significantly shortened. The result delay is reduced by 1 / 2 (from more than 3 minutes originally to within 1.5 minutes);
[0079] 4. The influence of the temperature fluctuation of the liquid to be measured on the detection result is reduced, and the accuracy of the liquid detection result is effectively improved.
[0080] It should be understood that the above description is for illustrative purposes and not for limitation. Upon reading the above description, many embodiments and many applications other than the provided examples will be apparent to those skilled in the art. Therefore, the scope of the present teachings should not be determined with reference to the above description, but rather should be determined with reference to the full scope of the foregoing claims and the equivalents thereof. For the sake of completeness, all articles and references, including the disclosures of patent applications and publications, are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein from the foregoing claims is not intended to abandon such subject matter, nor should it be considered that the applicant has not considered such subject matter to be part of the disclosed utility model subject matter.
Claims
1. A liquid spectrum acquisition device, characterized in that: It comprises a shell, an optical path system arranged in the shell, a liquid constant temperature system and a liquid path system, wherein the optical path system comprises a light source assembly, a one-to-two optical fiber, a reference collection module, a two-in-one optical fiber, a spectrometer, a first input collimator, a first output collimator, a second input collimator, and a second output collimator; the light source assembly is connected to the input end of the one-to-two optical fiber, the two output ends of the one-to-two optical fiber are respectively connected to the first input collimator and the second input collimator, the output end of the two-in-one optical fiber is connected to the spectrometer, and the two input ends of the two-in-one optical fiber are respectively connected to the first output collimator and the second output collimator, the reference collection module comprises a reference sample assembly and a switching assembly, the reference sample assembly comprises a fixing frame fixedly arranged in the shell, a cuvette and a reference plate fixedly arranged on the fixing frame, the switching assembly comprises a switching disk that can rotate relative to the fixing frame, a collection hole and a standard sheet arranged on the switching disk, and the The first input collimator and the second input collimator are both fixedly arranged on a side of the switching disk facing away from the fixed frame, the first output collimator and the second output collimator are fixedly arranged on a side of the fixed frame facing away from the switching disk, the first input collimator and the first output collimator are arranged opposite to each other and are both arranged opposite to the cuvette; the second input collimator and the second output collimator are arranged opposite to each other and are both arranged opposite to the reference plate; the liquid path system includes a hose bundle connected to the cuvette, the liquid constant temperature system includes a constant temperature box, the hose bundle is passed through the constant temperature box, and the liquid spectrum acquisition device has at least a first working state, a second working state and a third working state under the movement of the switching disk. In the first working state, the standard film is in a facing position with the reference plate; in the second working state, the acquisition hole is in a facing position with the reference plate; in the third working state, the acquisition hole is in a facing position with the cuvette.
2. The liquid spectrum acquisition device according to claim 1, characterized in that: The liquid spectrum collection device also has a fourth working state. In the fourth working state, any one of the reference plate and the cuvette and any one of the standard plate and the collection hole are in completely staggered positions.
3. The liquid spectrum acquisition device according to claim 1, characterized in that: The reference plate and the cuvette are arranged along the circumferential direction with respect to the rotation center of the switching disk, and the standard sheet and the collection hole are arranged along the circumferential direction with respect to the rotation center of the switching disk.
4. The liquid spectrum acquisition device according to claim 1, characterized in that: The hose bundle is arranged in a meandering manner inside the thermostat.
5. The liquid spectrum acquisition device according to claim 1, characterized in that: A gas-liquid separator is arranged between the hose bundle and the cuvette.
6. The liquid spectrum acquisition device according to claim 1, characterized in that: The liquid circuit system comprises a liquid inlet pipe and a liquid outlet pipe respectively connected with the inlet end and the outlet end of the cuvette, the liquid inlet pipe is located below the cuvette, and the liquid outlet pipe is located above the cuvette.
7. The liquid spectrum acquisition device according to claim 1, characterized in that: With the rotation center of the switching disk as the center of the circle, a first arc is formed between the center of the collection hole and the center of the cuvette, a second arc is formed between the center of the standard sheet and the center of the collection hole, and the first arc and the second arc overlap.
8. The liquid spectrum acquisition device according to claim 1, characterized in that: The aperture of the collection hole is larger than the aperture of the cuvette, and the aperture of the cuvette is larger than the apertures of the standard sheet and the reference plate.
9. The liquid spectrum acquisition device according to claim 1, characterized in that: The output end of the two-in-one optical fiber is provided with an installation positioning structure to ensure that the two centrally arranged fiber cores are aligned with the center of the slit of the spectrometer and are both located at the center of the slit.
10. The liquid spectrum acquisition device according to claim 1, characterized in that: The two fiber cores in the two-in-one optical fiber are closely arranged in the center, and the sum of the fiber diameters of the two fiber cores is smaller than the slit of the spectrometer.