Non-contact alcohol concentration measuring instrument, measuring device and detecting system

Abstract

The utility model provides a non-contact alcohol concentration measuring instrument, a measuring device and a detection system. The non-contact alcohol concentration measuring instrument comprises a detection light emitting mechanism; to-be-detected alcohol is contained in the alcohol container, and the working end of the detection light emitting mechanism faces the alcohol container; the feedback mechanism and the detection light emitting mechanism are arranged on the two sides of the alcohol container respectively, the feedback mechanism comprises an electric coupling detector and a control assembly, the detection light penetrates through the alcohol container from the detection light emitting mechanism to the electric coupling detector, and the electric coupling detector is connected with the control assembly. Accurate measurement can be carried out on the premise that the alcohol sample does not need to be contacted, the risk of sample pollution is greatly reduced, errors and uncertainty possibly existing in a traditional measurement method can be avoided, and therefore the measurement precision and accuracy can be improved. Compared with a conventional detection technology at the present stage, the method has the remarkable advantages of being simple in measurement, stable in result, high in detection precision, wide in application range and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of detection equipment, in particular to a non-contact alcohol concentration measuring instrument. Background Art

[0002] Alcohol detection technology is widely used in daily life, especially in ensuring public safety, promoting health monitoring and achieving personal health management. At present, the measurement of alcohol concentration mainly relies on traditional technologies such as specific gravity method, density method and infrared spectroscopy. However, these methods have certain limitations and shortcomings in practical applications.

[0003] The specific gravity method mainly calculates the specific gravity or concentration of alcohol by measuring the relationship between the density and volume of the alcohol solution. However, this method is greatly affected by environmental factors (such as temperature and humidity), resulting in inaccurate measurement results. In addition, the specific gravity method is cumbersome when processing optical signals, which is not conducive to large-scale production applications, so its application market is relatively narrow.

[0004] The density method is to calculate the alcohol concentration by measuring the density of alcohol liquid. This method requires the use of a density meter and a thermometer, and requires the density and temperature-related parameters of the alcohol. The operation process is complicated and requires precise instruments and equipment, which increases the uncertainty of the measurement.

[0005] Infrared spectroscopy measures alcohol concentration by analyzing alcohol liquids with an infrared spectrometer. This method requires professional instruments and technicians, is complicated to operate, and is too expensive to study. This limits the practical application of infrared spectroscopy.

[0006] Therefore, at this stage, it is necessary to develop a new type of alcohol concentration measurement technology in the field of alcohol detection technology to meet the market demand for high precision, easy operation and low cost. Summary of the invention

[0007] To this end, the technical problem to be solved by the utility model is to overcome the problems of complex operation, high measurement cost, limited usage scenarios and unstable detection results of alcohol detection technology in the prior art, and to provide a non-contact alcohol concentration meter, measuring device and detection system.

[0008] In order to solve the above technical problems, the utility model provides a non-contact alcohol concentration measuring instrument, which includes: a detection light emitting mechanism; an alcohol container, in which the alcohol to be detected is contained, and the working end of the detection light emitting mechanism is arranged toward the alcohol container; a feedback mechanism, in which the feedback mechanism and the detection light emitting mechanism are respectively arranged on both sides of the alcohol container, and the feedback mechanism includes an electrically coupled detector and a control component, and the detection light is transmitted from the detection light emitting mechanism through the alcohol container to the electrically coupled detector, and the electrically coupled detector is connected to the control component.

[0009] In one embodiment of the present invention, the detection light emitting mechanism includes a light source and a lens, and the light source and the alcohol container are respectively arranged on two opposite sides of the lens.

[0010] In one embodiment of the present invention, the spacing distance between the alcohol container and the lens is greater than the focal length of the lens.

[0011] In one embodiment of the present invention, the detection light emitting mechanism further includes an aperture, and the aperture is arranged between the light source and the lens.

[0012] In one embodiment of the utility model, the light source is a semiconductor laser head; the alcohol container is a transparent cuvette; and the control component is a single chip microcomputer.

[0013] In one embodiment of the utility model, the control component includes a filter output module, a constant current light source module, a regulating module, a processing module and a display module connected in sequence, wherein the electrical coupling detector is connected to the filter output module.

[0014] In one embodiment of the present invention, the control component further includes a flow stabilizing structure, and the flow stabilizing structure is connected to the filter output module.

[0015] In one embodiment of the present invention, the current stabilization structure includes an input pin, an operational amplifier, and a ground terminal connected in sequence, wherein the filter output module is connected to the input pin.

[0016] The utility model also provides a measuring device, which comprises at least one of the above-mentioned non-contact alcohol concentration measuring instruments.

[0017] The utility model also provides a detection system, which comprises at least one of the above-mentioned non-contact alcohol concentration measuring instruments.

[0018] The above technical solution of the utility model has the following advantages compared with the prior art:

[0019] The non-contact alcohol concentration measuring instrument, measuring device and detection system described in the utility model are provided with a detection light emitting mechanism and a feedback mechanism on both sides of the alcohol container, thereby detecting the reflectivity of light of alcohols of different concentrations through the feedback mechanism to realize non-contact calculation and detection of alcohol concentration, which can perform accurate measurement without contacting the alcohol sample. On the one hand, it greatly reduces the risk of contaminating the sample, and on the other hand, it can also avoid the errors and uncertainties that may exist in traditional measurement methods, thereby improving the measurement precision and accuracy. Compared with the conventional detection technology at this stage, the present application creatively adopts a photoelectric combination method to detect alcohol concentration, which has the significant advantages of simple measurement, stable results, high detection accuracy and a wide range of applications. It is a new type of non-contact alcohol concentration measuring instrument, measuring device and detection system with broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to make the content of the utility model more clearly understood, the utility model is further described in detail below based on specific embodiments of the utility model in combination with the accompanying drawings.

[0021] Figure 1 It is a structural schematic diagram of a non-contact alcohol concentration measuring instrument in a preferred embodiment of the utility model;

[0022] Figure 2 yes Figure 1 The working flow diagram of the control components in the non-contact alcohol concentration measuring instrument shown;

[0023] Figure 3 yes Figure 2 A circuit diagram of the control assembly shown;

[0024] Figure 4 yes Figure 1 The schematic diagram of the working principle of the non-contact alcohol concentration measuring instrument is shown.

[0025] Explanation of the reference numerals in the specification: 100, detection light emitting mechanism; 110, light source; 120, aperture; 130, lens; 200, alcohol container; 300, feedback mechanism; 310, electrically coupled detector; 320, control component; 321, filter output module; 322, constant current light source module; 323, adjustment module; 324, processing module; 325, display module; PA5, input pin; 326, operational amplifier; R4, ground terminal resistor. DETAILED DESCRIPTION

[0026] See also Figure 1As shown, this embodiment provides a non-contact alcohol concentration measuring instrument, which includes: a detection light emitting mechanism 100; an alcohol container 200, in which the alcohol to be detected is contained, and the working end of the detection light emitting mechanism 100 is arranged toward the alcohol container 200; a feedback mechanism 300, in which the feedback mechanism 300 and the detection light emitting mechanism 100 are respectively arranged on both sides of the alcohol container 200, and the feedback mechanism 300 includes an electrically coupled detector 310 (CCD) and a control component 320, and the detection light is transmitted from the detection light emitting mechanism 100 through the alcohol container 200 to the electrically coupled detector 310, and the electrically coupled detector 310 is connected to the control component 320.

[0027] The non-contact alcohol concentration measuring instrument described in this embodiment is provided with a detection light emitting mechanism 100 and a feedback mechanism 300 on both sides of the alcohol container 200, thereby detecting the reflectivity of light of alcohol of different concentrations through the feedback mechanism 300 to realize non-contact calculation detection of alcohol concentration, which can perform accurate measurement without contacting the alcohol sample. On the one hand, it greatly reduces the risk of contaminating the sample, and on the other hand, it can also avoid the errors and uncertainties that may exist in traditional measurement methods, thereby improving the measurement precision and accuracy. Compared with the conventional detection technology at this stage, the present application creatively adopts a photoelectric combination method to detect alcohol concentration, which has the significant advantages of simple measurement, stable results, high detection accuracy and wide application range, and is a new type of non-contact alcohol concentration measuring instrument with broad application prospects.

[0028] by Figure 1 The non-contact alcohol concentration measuring instrument shown is a reference. In this embodiment, the detection light emitting mechanism 100, the alcohol container 200 and the feedback mechanism 300 are arranged in sequence from left to right in the same horizontal plane, wherein the detection light emitting mechanism 100 is used to provide detection light, the alcohol container 200 is used to hold the alcohol to be detected, and at the same time refracts the light emitted by the detection light emitting mechanism 100, and the feedback mechanism 300 is used to receive the refracted light and analyze and calculate it, thereby realizing non-contact alcohol concentration detection.

[0029] Specifically, in this embodiment, the detection light emitting mechanism 100 includes a light source 110 and a lens 130, and the light source 110 and the alcohol container 200 are respectively arranged on opposite sides of the lens 130. Among them, the light source 110 is preferably a 5mW red dot semiconductor laser head, which can emit a monochromatic parallel laser with a wavelength of 650nm, and it also has the advantages of low power and low cost. The lens 130 is used to converge parallel lasers. Furthermore, considering the focal length parameter problem, the spacing distance between the alcohol container 200 and the lens 130 is greater than the focal length of the lens 130. Thereby, the incident light can be diverged after the convergence effect of the lens 130, so that the alcohol container 200 can receive and refract the divergent light, thereby improving the stability and accuracy of its detection.

[0030] The detection light emitting mechanism 100 in this embodiment further includes an aperture 120, which is disposed between the light source 110 and the lens 130. Specifically, after emitting parallel light, the laser first passes through the aperture 120, which adjusts the light beam into a circular light beam, and then passes through the convex lens 130, thereby improving the quality and intensity of the incident light.

[0031] In this embodiment, the alcohol container 200 is preferably a transparent cuvette made of quartz, thereby minimizing the interference of the alcohol container 200 on the angle and intensity of the incident light. In other embodiments, the alcohol container 200 can also be set as other transparent material elements with low refractive index, and the utility model does not make specific restrictions on this.

[0032] In this embodiment, the electric couple and detector are preferably TCD1304 linear array CCD, whose pixel size is 8um×200um and wavelength response range is 300nm~1100nm. This CCD can transmit the collected data to the control component 320, and the control component 320 performs corresponding processing on the data returned by the CCD.

[0033] In this embodiment, the control component 320 is preferably a single chip microcomputer. Figure 1 and Figure 2As shown, the control component 320 includes a filter output module 321, a constant current light source module 322, an adjustment module 323, a processing module 324 and a display module 325 connected in sequence, wherein the electric coupling detector 310 is connected to the filter output module 321. Among them, the filter output module 321 is a GD32F 103RET6 DA first-order filter output device, which can achieve smooth output waveform, reduce conversion error, improve frequency response and suppress interference in the process of digital to analog conversion; the constant current light source module 322 is a digitally controlled constant current laser source 110 emitting laser, which can stabilize current, protect laser, optimize laser performance, compensate for temperature and humidity and control laser output; the adjustment module 323 is a case adjusting laser intensity device, which is used to improve laser adaptability; the processing module 324 can obtain and process the corresponding electric couple and detector data from the single chip microcomputer, and transmit the processed data information back to the display module 325, and the display module 325 is used to feedback and display the detection results.

[0034] In actual use, only by maintaining the stability of the light source 110 can the reliability and stability of the measurement result be guaranteed. Therefore, the device also includes a flow stabilization structure to ensure the basis for accurate alcohol concentration measurement, see Figure 3 As shown, the steady current structure is connected to the filter output module 321. Specifically, the steady current structure includes an input pin PA5, an operational amplifier 326 and a ground terminal connected in sequence, wherein the filter output module 321 is connected to the input pin PA5. Further, the information data is transmitted to the operational amplifier 326 through the PA5 pin. From the virtual short characteristic of the operational amplifier, it can be seen that the voltage of the operational amplifier 326 is equal to that of the ground terminal resistor R4, so the current flowing through the above structure is constant. According to Kirchhoff's current law (KCL), it can be seen that the current flowing through the control component 320 is constant, which can make the measurement result more stable.

[0035] See the schematic diagram of the working principle of the non-contact alcohol concentration measuring instrument in this embodiment. Figure 4 As shown, 1 and 1' are the beam paths of the laser when it passes through the air, and 2 and 2' are the beam paths of the laser when it passes through the alcohol to be detected. The refractive index of the alcohol container is n1, the thickness is d, and the inner width is L1. The HI plane is the detection plane of the electrically coupled detector. From the geometric relationship, it can be seen that the line segment EG∥CF, GH∥FI, so the line segment ED=GF=HI can be obtained.

[0036] Furthermore, assuming that the refractive index of the alcohol to be tested is n, according to the law of refraction:

[0037]

[0038] It can be further known that the refractive index n of the alcohol to be tested is: Therefore, we only need to find sinα and sinγ to calculate the refractive index of alcohol. (where α is the incident angle of air, β is the incident angle of the rectangular quartz cuvette, and γ is the refraction angle of the alcohol to be measured.)

[0039] Since 1 and 1' are the beam paths of the laser when it passes through the air, ∠EBC=∠α in ΔBCE and ΔHMN. Let MN=m, HN=n, then: The values ​​of m and n are the values ​​that can be measured when the laser passes through the air. They are constants that have nothing to do with the alcohol concentration to be measured, so it is sufficient to only measure the value of sinγ.

[0040]

[0041] In ΔHMN we have:

[0042] And because:

[0043] so

[0044] The refractive index of the alcohol to be tested is:

[0045]

[0046] make After further simplification, we can get:

[0047] By converting the refractive index into the length of four line segments, for different concentrations of alcohol, and L1 are constant, so we only need to measure the change in beam diameter L2 before and after adding alcohol to the container to find out the refractive index n of alcohol.

[0048] Furthermore, the present application measures the refractive index of alcohol and then calculates the concentration of alcohol based on the relationship between the refractive index and concentration of alcohol. Data processing is extremely important in the actual operation process.

[0049] Therefore, the data processing in this application adopts the improved least squares method. The basic principle of least squares regression is to perform stepwise regression, and the algorithm can gradually check the significance of the verification model. When the information is incomplete, the significance requirement can be met by gradually adding variables. When the model meets the preset model significance requirement, the calculation will be stopped. The improved least squares method has improved the accuracy and reliability of the original least squares method in the algorithm. After the model is established according to the improved least squares method, to obtain the alcohol concentration data, you only need to find the corresponding point in the model curve.

[0050] Embodiment 2

[0051] This embodiment provides a measuring device, which includes at least one non-contact alcohol concentration measuring instrument described in Embodiment 1.

[0052] Embodiment 3

[0053] This embodiment provides a detection system, which includes at least one non-contact alcohol concentration measuring instrument described in Embodiment 1.

[0054] In summary, the non-contact alcohol concentration measuring instrument, measuring device and detection system described in the utility model are provided with detection light emitting mechanisms and feedback mechanisms on both sides of the alcohol container, thereby detecting the reflectivity of light of alcohols of different concentrations through the feedback mechanism to realize non-contact calculation and detection of alcohol concentration, which can perform accurate measurements without contacting the alcohol sample. On the one hand, it greatly reduces the risk of contaminating the sample, and on the other hand, it can also avoid the errors and uncertainties that may exist in traditional measurement methods, thereby improving the measurement precision and accuracy. Compared with the conventional detection technology at this stage, the present application creatively adopts a photoelectric combination method to detect alcohol concentration, which has the significant advantages of simple measurement, stable results, high detection accuracy and a wide range of applications, and is a new type of non-contact alcohol concentration measuring instrument, measuring device and detection system with broad application prospects.

[0055] Obviously, the above embodiments are merely examples for the purpose of clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from these are still within the scope of protection of the invention of the utility model.

Claims

1. A non-contact alcohol concentration measuring instrument, characterized in that: include: Detecting a light emitting mechanism; An alcohol container, in which the alcohol to be detected is contained, and a working end of the detection light emitting mechanism is arranged toward the alcohol container; Feedback mechanism, the feedback mechanism and the detection light emitting mechanism are respectively arranged on both sides of the alcohol container, the feedback mechanism includes an electrically coupled detector and a control component, the detection light is transmitted from the detection light emitting mechanism through the alcohol container to the electrically coupled detector, and the electrically coupled detector is connected to the control component.

2. The non-contact alcohol concentration measuring instrument according to claim 1, characterized in that: The detection light emitting mechanism comprises a light source and a lens, and the light source and the alcohol container are respectively arranged on two opposite sides of the lens.

3. The non-contact alcohol concentration measuring instrument according to claim 2, characterized in that: The spacing distance between the alcohol container and the lens is greater than the focal length of the lens.

4. The non-contact alcohol concentration measuring instrument according to claim 3, characterized in that: The detection light emitting mechanism further includes an aperture, and the aperture is arranged between the light source and the lens.

5. The non-contact alcohol concentration measuring instrument according to claim 2, characterized in that: The light source is a semiconductor laser head; the alcohol container is a transparent cuvette; and the control component is a single chip microcomputer.

6. The non-contact alcohol concentration measuring instrument according to claim 1, characterized in that: The control component comprises a filter output module, a constant current light source module, a regulating module, a processing module and a display module which are connected in sequence, wherein the electrical coupling detector is connected to the filter output module.

7. The non-contact alcohol concentration measuring instrument according to claim 6, characterized in that: The control component further comprises a flow stabilizing structure, and the flow stabilizing structure is connected to the filter output module.

8. The non-contact alcohol concentration measuring instrument according to claim 7, characterized in that: The current stabilization structure comprises an input pin, an operational amplifier and a ground terminal which are connected in sequence, wherein the filter output module is connected to the input pin.

9. A measuring device, characterized in that: The invention comprises at least one non-contact alcohol concentration measuring instrument as described in any one of claims 1 to 8.

10. A detection system, characterized in that: The invention comprises at least one non-contact alcohol concentration measuring instrument as described in any one of claims 1 to 8.

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