CN221686207U - Alcohol concentration non-contact measuring device - Google Patents
Alcohol concentration non-contact measuring device Download PDFInfo
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- CN221686207U CN221686207U CN202420045612.1U CN202420045612U CN221686207U CN 221686207 U CN221686207 U CN 221686207U CN 202420045612 U CN202420045612 U CN 202420045612U CN 221686207 U CN221686207 U CN 221686207U
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- optical fiber
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- mirror
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- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 title claims abstract description 36
- 239000013307 optical fiber Substances 0.000 claims abstract description 74
- 230000008878 coupling Effects 0.000 claims abstract description 30
- 238000010168 coupling process Methods 0.000 claims abstract description 30
- 238000005859 coupling reaction Methods 0.000 claims abstract description 30
- 238000005259 measurement Methods 0.000 claims abstract description 7
- 238000004891 communication Methods 0.000 claims abstract description 4
- 238000012545 processing Methods 0.000 claims description 12
- 230000003287 optical effect Effects 0.000 claims description 11
- 238000001514 detection method Methods 0.000 claims description 9
- 230000031700 light absorption Effects 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 4
- 238000004364 calculation method Methods 0.000 claims description 3
- 230000003595 spectral effect Effects 0.000 claims description 2
- 239000000835 fiber Substances 0.000 abstract description 4
- 230000010354 integration Effects 0.000 abstract description 2
- 238000010521 absorption reaction Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000000609 electron-beam lithography Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 235000013334 alcoholic beverage Nutrition 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 230000010363 phase shift Effects 0.000 description 2
- KMUONIBRACKNSN-UHFFFAOYSA-N potassium dichromate Chemical compound [K+].[K+].[O-][Cr](=O)(=O)O[Cr]([O-])(=O)=O KMUONIBRACKNSN-UHFFFAOYSA-N 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000000041 tunable diode laser absorption spectroscopy Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000001476 alcoholic effect Effects 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000011088 calibration curve Methods 0.000 description 1
- 238000004737 colorimetric analysis Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 238000004817 gas chromatography Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000000053 physical method Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 238000004448 titration Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The utility model discloses a non-contact alcohol concentration measuring device, which comprises an REC-DFB laser, wherein the REC-DFB laser is fixedly connected with an optical fiber collimating mirror through a single mode fiber and is used for emitting laser beams, the laser beams enter the optical fiber collimating mirror through the single mode fiber, the optical fiber collimating mirror is connected with one end hole site of a cuvette frame with holes at two ends, a cuvette is arranged in the cuvette frame, the optical fiber collimating mirror is used for changing the laser beams into parallel light and enters the cuvette, the holes at the other end of the cuvette frame are connected with an optical fiber focusing coupling mirror, the optical fiber focusing coupling mirror is fixedly connected with a photoelectric detector through multimode optical fibers and is used for transmitting received light into the photoelectric detector through multimode optical fibers, and the photoelectric detector is in communication connection with an upper computer and is used for transmitting detected signals to the upper computer; the utility model can realize rapid, accurate and non-contact measurement, has low cost, accurate wavelength, good stability, compact overall size and convenient integration.
Description
Technical Field
The utility model relates to a non-contact measuring device, in particular to a non-contact measuring device for alcohol concentration.
Background
In recent years, the state has strict regulations on the ethanol content in alcoholic beverages. Therefore, it is important to rapidly and accurately measure the ethanol content of alcoholic beverages in quality control of food industry. Compared with the traditional physical method (density bottle method, gas chromatography, alcohol meter method) and chemical method (potassium dichromate colorimetric method, morse salt method, iodometric titration method, etc.), the non-contact alcohol concentration measuring device based on the REC-DFB laser has the advantages of no need of pretreatment, high speed, low cost, no pollution, no damage to the chemical properties of samples, high result reproducibility, environmental protection, multi-component simultaneous analysis, suitability for on-site online analysis, and the like, and provides a quick, convenient and accurate alcohol concentration measuring mode.
In the prior art, a TDLAS non-contact measurement method adopting a tunable semiconductor laser is required to scan a gas absorption peak with a relatively low line width, and is limited by the high cost of the semiconductor laser, so that the TDLAS technology is difficult to popularize in a large range. The measuring device of the traditional DFB laser is used for etching the grating with the special structure by using an electron beam exposure (Electron Beam Lithography, EBL) technology, such as inserting pi phase shift to manufacture a laser with better single-mode characteristic, a phase shift grating, a chirped grating, an apodization grating and the like, but the EBL technology has the defects of high manufacturing difficulty, high cost and low efficiency, and the influence of processing errors on the wavelength and the single-mode stability is relatively large, so that the cost of the DFB laser with accurate manufacturing process is high, and the DFB laser is not suitable for large-scale application.
Disclosure of utility model
The utility model aims to: the utility model aims to provide a non-contact alcohol concentration measuring device which is low in device cost, simple, efficient, stable and easy to operate.
The technical scheme is as follows: the utility model relates to a non-contact alcohol concentration measuring device, which comprises: the device comprises a laser module, a space light absorption module and a detection processing module, wherein the laser module comprises a laser, a current driving circuit and a temperature control circuit; the space light absorption module comprises an optical fiber collimating mirror, an optical fiber focusing coupling mirror, a cuvette frame and a cuvette; the detection processing module comprises a photoelectric detector and an upper computer;
The laser is connected with the optical fiber collimating mirror and is used for emitting laser beams, the laser beams are changed into parallel light through the optical fiber collimating mirror and enter the cuvette in the cuvette frame, the other end of the cuvette frame is connected with the optical fiber focusing coupling mirror, the optical fiber focusing coupling mirror transmits received light to the photoelectric detector connected with the optical fiber focusing coupling mirror, and the photoelectric detector transmits detected laser signals to the upper computer.
Further, the laser is an REC-DFB laser, and the spectrum range of the emitted laser beam is 1230nm-1450nm; the current driving circuit and the temperature control circuit are integrated in the laser and used for driving the laser to work.
Further, the laser is fixedly connected with the optical fiber collimating mirror through a single-mode optical fiber, the optical fiber focusing coupling mirror is fixedly connected with the photoelectric detector through a multimode optical fiber, and the photoelectric detector is in communication connection with the upper computer.
Further, two ends of the cuvette frame are respectively provided with a hole, and the holes are respectively connected with an optical fiber collimating mirror and an optical fiber focusing coupling mirror; the optical axis and the focus of the optical fiber collimating mirror and the optical axis and the focus of the optical fiber focusing coupling mirror are positioned on the same horizontal line, and the horizontal line is perpendicular to the side surface of the cuvette frame.
Further, during measurement, the liquid level in the cuvette is higher than the open pore positions at the two ends of the cuvette frame.
Further, the appearance of the optical fiber collimating mirror and the appearance of the optical fiber focusing coupling mirror accord with the SMA905 collimating appearance standard, one end of the optical fiber collimating mirror is a 3/8-24UNF connector, and the other end of the optical fiber collimating mirror is an FC connector; the open hole standard of the cuvette frame is 3/8-24UNF standard, and the optical fiber collimating mirror and the optical fiber focusing coupling mirror are connected with the cuvette frame through a 3/8-24UNF connector.
Further, the cuvette frame is a U-shaped frame, the bottom of the cuvette frame is provided with a clamping groove, the inner diameter of the clamping groove is consistent with the outer diameter of the cuvette, two sides of the cuvette are tightly attached to the inner walls at two ends of the cuvette frame, and the position of the clamping groove is lower than the position of the holes at two ends of the cuvette frame.
Further, the upper computer comprises a control program and an interface operation program, the upper computer carries out signal processing on input data according to a preset algorithm, and the signal processing comprises automatic calibration and solution concentration calculation.
The beneficial effects are that: compared with the prior art, the alcohol concentration non-contact type measuring device based on the REC-DFB laser has the advantages that all parts of the system are designed in a modularized mode through the independently-developed high-integration laser, all parts are connected in series by reasonably utilizing the transmission line, and the production cost is lower, the measuring result error is smaller, and the integration level is higher.
Drawings
FIG. 1 is a schematic diagram of an embodiment of the present utility model;
fig. 2 is a schematic structural view of a cuvette holder according to an embodiment of the present utility model.
Detailed Description
The technical scheme of the utility model is further described below with reference to the accompanying drawings and examples.
As shown in fig. 1, the non-contact measurement device for alcohol concentration provided in this embodiment includes: a laser module, a space light absorption module and a detection processing module,
A laser module comprising an REC-DFB laser 1, a current drive circuit and a temperature control circuit;
The space light absorption module comprises an optical fiber collimating mirror 4, an optical fiber focusing coupling mirror 5, a cuvette frame 7 and a cuvette 6;
the detection processing module comprises a photoelectric detector 8 and an upper computer 9;
The REC-DFB laser 1 is fixedly connected with the optical fiber collimating mirror 4 through the single-mode optical fiber 2 and is used for emitting laser beams, the laser beams enter the optical fiber collimating mirror 4 through the single-mode optical fiber 2, two ends of the cuvette frame 7 are respectively provided with a hole, the cuvette 6 is a transparent cuvette and is placed in the cuvette frame 7, the optical fiber collimating mirror 4 is connected with an opening at one end of the cuvette frame 7 and is used for changing the laser beams into parallel light and entering the cuvette 6, an opening at the other end of the cuvette frame 7 is connected with the optical fiber focusing coupling mirror 5, the optical fiber focusing coupling mirror 5 is fixedly connected with the photoelectric detector 8 through the multimode optical fiber 3 and is used for transmitting received light into the photoelectric detector 8 through the multimode optical fiber 3, and the photoelectric detector 8 is in communication connection with the upper computer 9 and is used for transmitting detected signals into the upper computer 9; the optical axis and the focus of the optical fiber collimating mirror 4 and the optical fiber focusing coupling mirror 5 are positioned on the same horizontal line, and the horizontal line is perpendicular to the side surface of the cuvette frame 7.
The spectral range of the laser beam emitted by the REC-DFB laser 1 is 1230nm-1450nm, and the wavelength is positioned in the alcohol absorption peak range; the current driving circuit and the temperature control circuit are integrated, and the pins of the current driving circuit and the temperature control circuit are connected with the pins of the laser and used for driving the laser to work.
The optical fiber collimating mirror 4 and the optical fiber focusing coupling mirror 5 are both provided with a 3/8-24UNF connector at one end and an FC connector at the other end, as shown in figure 2, the bottom of the U-shaped cuvette frame is provided with a groove, the inner diameter of the groove is consistent with the outer diameter of the cuvette 6, the cuvette 6 can be stably placed, and both sides of the groove are provided with 3/8-24UNF standard American screw holes; the space optical lenses (the optical fiber collimating lens 4 and the optical fiber focusing coupling lens 5) are respectively screwed on the two sides of the U-shaped cuvette frame through spiral holes and used for reducing interference of other signals, so that an optical path is more stable and parallel to pass through the alcohol solution to be detected, and a laser signal is more stable and reliable.
The photoelectric detector 8 is connected with the optical fiber focusing coupling mirror 5 through the multimode optical fiber 3 and is used for detecting a laser signal passing through the cuvette 6 filled with the alcohol solution to be detected and converting the optical signal into an electric signal; the upper computer 9 program provides a visual interface, processes data and a calibration curve, and comprises the following steps: the control and interface operation program, the collected data are led into the upper computer 9 to perform proper signal processing according to the preset algorithm, including automatic calibration, solution concentration calculation, etc
In the alcohol concentration detecting method of the above device, the REC-DFB laser 1 emits a laser beam of a predetermined wavelength and power value, and the laser beam enters the spatial light absorption module through the single-mode fiber 2. Then, a fiber collimator lens 4 is used to generate parallel light, a cuvette frame 7 is placed close to the lens, the cuvette frame 7 is a transparent cuvette frame, and a cuvette 6 containing a sample to be measured (alcohol solution) is placed in the cuvette frame. We place cuvette 6 laterally (long side is the direction of light propagation) for a larger optical path. The other end of the cuvette frame 7 is connected with an optical fiber focusing coupling mirror 5, and finally connected with a high-sensitivity photoelectric detector 8 by using a multimode optical fiber 3. The alcohol solution in the cuvette 6 absorbs a part of the light and the transmitted light power is reduced. The absorption coefficient of water is greater than that of alcohol, and as the alcohol concentration increases, the transmitted light intensity increases. The alcohol concentration in the sample can be calculated by the preset and calibrated algorithm by reading the photoelectric detector 8 and inputting the reading into the upper computer 9.
The alcohol concentration detection method according to the embodiment specifically includes:
(1) According to lambert-beer's law, the transmitted light intensity is related to the solution absorption coefficient and the light propagation distance: i=i 0exp(-aL).I0 is the intensity of incident light, I is the intensity of transmitted light, L is the propagation distance, and a is the absorption coefficient of the alcoholic solution. Therefore, the measured solution absorbs the laser beam when the laser beam with a specific wavelength passes through the measured alcohol solution, so that the laser intensity is attenuated. The concentration of the measured alcohol liquid can be quantitatively obtained by analyzing and calculating the intensity attenuation of the laser after penetrating through the liquid.
(2) The REC-DFB laser 1 emits a laser beam of a predetermined wavelength and power value, specifically, we select a 1310nm optical band whose absorption coefficients of water and alcohol differ greatly, thus having higher detection accuracy.
(3) The REC-DFB laser 1 and the optical fiber collimating mirror 4 are connected by a single mode optical fiber 2. The multimode optical fiber 3 connects the optical fiber focusing coupling mirror 5 and the photodetector 8, so as to obtain higher coupling efficiency and receive larger optical power.
(4) Cuvette 6 as shown, the length of cuvette 6 is chosen to be 5cm and the volume 17.5mL, since a larger length can theoretically improve the detection accuracy, but may also make the transmitted light too small. The cuvette frame 7 has a small tolerance, in order to minimize errors, the cuvette 6 is uniformly attached to the light source emitting end (the side of the optical fiber collimating mirror 4) during measurement, and the front and back propagation directions of the cuvette 6 are detected.
(5) Calibrating: n groups of samples with known concentration values sequentially pass through the device, the upper computer 9 records n groups of emergent signal power values, and a linear curve of the concentration and the power values of the solution is fitted. Measurement: and (3) passing the sample to be detected with unknown concentration value through the device, measuring the power value of the emergent signal, finding the concentration value corresponding to the power value on the linear curve by the upper computer 9, and displaying the result.
The embodiment of the utility model does not limit the model of each device except for special description, and the model of other devices only needs to be capable of completing the functional devices. Those skilled in the art will appreciate that the drawings are schematic representations of only one preferred embodiment, and that the above-described embodiment numbers are merely for illustration purposes and do not represent advantages or disadvantages of the embodiments. The foregoing description of the preferred embodiments of the utility model is not intended to limit the utility model to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the utility model are intended to be included within the scope of the utility model.
Claims (8)
1. A non-contact alcohol concentration measuring device, comprising: the device comprises a laser module, a space light absorption module and a detection processing module; the laser module comprises a laser (1), a current driving circuit and a temperature control circuit; the space light absorption module comprises an optical fiber collimating mirror (4), an optical fiber focusing coupling mirror (5), a cuvette frame (7) and a cuvette (6); the detection processing module comprises a photoelectric detector (8) and an upper computer (9);
The laser device (1) is connected with the optical fiber collimating mirror (4) and is used for emitting laser beams, the laser beams are changed into parallel light through the optical fiber collimating mirror (4) and enter a cuvette (6) in the cuvette frame (7), the other end of the cuvette frame (7) is connected with the optical fiber focusing coupling mirror (5), the optical fiber focusing coupling mirror (5) transmits received light into the photoelectric detector (8) connected with the optical fiber focusing coupling mirror, and the photoelectric detector (8) transmits detected signals to the upper computer (9).
2. The alcohol concentration non-contact measuring device according to claim 1, wherein the laser (1) is a REC-DFB laser, and the emitted laser beam has a spectral range of 1230nm-1450nm; the current driving circuit and the temperature control circuit are integrated in the laser (1) and are used for driving the laser (1) to work.
3. The alcohol concentration non-contact measuring device according to claim 1, wherein the laser (1) and the optical fiber collimating mirror (4) are connected and fixed through a single-mode optical fiber (2), the optical fiber focusing coupling mirror (5) and the photoelectric detector (8) are connected and fixed through a multimode optical fiber (3), and the photoelectric detector (8) is in communication connection with the upper computer (9).
4. The alcohol concentration non-contact measuring device according to claim 1, wherein two ends of the cuvette frame (7) are respectively provided with a hole, and the two holes are respectively connected with the optical fiber collimating mirror (4) and the optical fiber focusing coupling mirror (5); the optical axis and the focus of the optical fiber collimating mirror (4) and the optical axis and the focus of the optical fiber focusing coupling mirror (5) are positioned on the same horizontal line, and the horizontal line is perpendicular to the side face of the cuvette frame (7).
5. The non-contact alcohol concentration measuring device according to claim 4, wherein the liquid level in the cuvette (6) is higher than the open positions at the two ends of the cuvette holder (7) during measurement.
6. The alcohol concentration non-contact measurement device according to claim 4, wherein the appearance of the optical fiber collimating mirror (4) and the optical fiber focusing coupling mirror (5) meet the SMA905 collimating appearance standard, and one end is a 3/8-24UNF connector, and the other end is an FC connector; the cell frame (7) has an opening standard of 3/8-24UNF standard, and the optical fiber collimating mirror (4) and the optical fiber focusing coupling mirror (5) are connected with the cell frame (7) through a 3/8-24UNF connector.
7. The alcohol concentration non-contact measuring device according to claim 4, wherein the cuvette frame (7) is a U-shaped frame, the bottom of the cuvette frame is provided with a clamping groove, the inner diameter of the clamping groove is consistent with the outer diameter of the cuvette (6), two sides of the cuvette (6) are tightly attached to inner walls at two ends of the cuvette frame (7), and the position of the clamping groove is lower than the position of openings at two ends of the cuvette frame (7).
8. The non-contact measuring device for alcohol concentration according to claim 1, wherein the upper computer (9) comprises a control program and an interface operation program, the upper computer (9) performs signal processing on input data according to a preset algorithm, and the signal processing comprises automatic calibration and calculation of solution concentration.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202420045612.1U CN221686207U (en) | 2024-01-09 | 2024-01-09 | Alcohol concentration non-contact measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202420045612.1U CN221686207U (en) | 2024-01-09 | 2024-01-09 | Alcohol concentration non-contact measuring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN221686207U true CN221686207U (en) | 2024-09-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202420045612.1U Active CN221686207U (en) | 2024-01-09 | 2024-01-09 | Alcohol concentration non-contact measuring device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN221686207U (en) |
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- 2024-01-09 CN CN202420045612.1U patent/CN221686207U/en active Active
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