CN107238595B - Alcohol concentration measuring device and measuring method for closed container - Google Patents
Alcohol concentration measuring device and measuring method for closed container Download PDFInfo
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- CN107238595B CN107238595B CN201710312749.3A CN201710312749A CN107238595B CN 107238595 B CN107238595 B CN 107238595B CN 201710312749 A CN201710312749 A CN 201710312749A CN 107238595 B CN107238595 B CN 107238595B
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
- G01N21/65—Raman scattering
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Abstract
The invention discloses an alcohol concentration measuring device and method for a closed container. The probe is arranged on the side wall of the shell and is used for carrying out laser excitation and receiving aiming at a closed container containing an alcohol solution sample. The embedded system circuit board card module controls the laser light source module to emit laser to the probe through the laser power control module, the laser is scattered by alcohol solution in the closed container and then received by the probe, a scattered light receiving signal is extracted by the Raman signal acquisition module to obtain Raman spectrum data and then sent to the embedded system circuit board card module, and the embedded system circuit board card module processes and distinguishes spectrum characteristic peak values according to the Raman spectrum data and calculates to obtain alcohol concentration. The invention has small volume, simple and convenient operation, nondestructive and rapid detection, no pretreatment on detection samples, direct detection without disassembling the sealed wine bottle, and solves the problems of complicated operation, wide application objects and larger field application value of the traditional specific gravity bottle method and the alcohol meter method.
Description
Technical Field
The invention belongs to the field of detection, and particularly relates to an alcohol concentration measuring device and method for a closed container.
Background
Alcohol is widely used in chemical industry, metallurgy, paper making, printing, wine making, food, sugar industry and environmental protection industry. The alcohol concentration is one of the main indexes of the quality of white spirit and industrial alcohol. Measured according to national standards. The white spirit sample must be distilled, fixed in volume and measured for alcohol concentration by using a specific gravity bottle method or an alcohol meter method, and the above methods are time-consuming and have complicated procedures. When the device analysis method is adopted, such as gas chromatography is used for analyzing the ethanol content in the white spirit, the operation process is complex, and the device is expensive, so that the rapid detection of the ethanol concentration in the white spirit production process is difficult to realize. The Raman scattering spectrum technology has the advantages of low cost, simple and convenient operation and rapidness of the near infrared spectrum technology, and the detection sample does not need to be preprocessed, so that the defect that the near infrared technology is interfered by water is overcome, and the Raman scattering rapid detection device is an ideal tool for researching the aqueous solution.
The method is mainly divided into four types through the searching discovery of the prior art:
1) Based on an alcohol specific gravity measuring instrument method. For example, chinese patent CN105372152 describes that alcohol specific gravity calculation is performed by using a glass densitometer, a grating scale sensor for measuring a vertical floating distance of the glass densitometer in a liquid to be measured, and a measurement and control system connected to the grating scale sensor. The detection system related by the technology has a complex installation structure; the device has no alcohol recognition capability and needs to be manually specified; the measuring method is that a lossy detection mode contacts a sample to be measured; when the detection object is in the closed glass container, the device measurement technology cannot be used.
2) A terahertz anisotropic medium resonance effect-based detection method. For example, chinese patent CN102830069a describes that a terahertz anisotropic medium is constructed by arranging two layers of metal resonant ring arrays on the upper and lower surfaces of a polyimide substrate, an alcohol solution to be tested is placed on the metal resonant ring array on one side of the anisotropic medium, and then alcohol detection is completed by using a terahertz large-scale device. The detection system related to the technology has high cost and is not suitable for on-site application popularization or on-line application; the measuring method is that a lossy detection mode contacts a sample to be measured; when the detection object is in the closed glass container, the device measurement technology cannot be used.
3) Based on the laser path difference method. For example, chinese patent CN103630513a describes a laser optical path difference measuring device with a U-shaped holder, which first generates saw-wave laser, then transmits the saw-wave laser to the movable end of the holder of the measuring part through an optical fiber, and the saw-wave laser is reflected by the focusing mirror and then returns to the optical fiber, and the returned saw-wave laser is processed, and the alcohol concentration is calculated by processing the optical path difference digital signal. The device related to the technology needs to additionally fix and test the bottle path of the wine bottle, and the device needs to completely reflect the light path; when the volume of the container is too large, the device is difficult to use, and when the storage container structure does not support the application occasion of the complete reflection light path, the device cannot be used; the device does not have the ability to identify alcohol and requires manual assignment.
The method has the problems that the steps are complex and difficult to be used for on-site or mobile nondestructive rapid detection application or large-scale professional devices with high cost are relied on, and the like, so that a detection device of a novel method is needed.
Disclosure of Invention
In order to solve the problems that the current alcohol detection method is complex and is not beneficial to being used for on-site and mobile nondestructive rapid detection application or depends on a large-scale professional device with high cost, the invention provides an alcohol concentration measurement device and an alcohol concentration measurement method for a closed container, which can rapidly and nondestructively measure the alcohol concentration in the closed container.
The invention has the advantages of small volume, low cost, simple and convenient operation, nondestructive and rapid detection, no pretreatment on detection samples, direct detection and measurement without disassembling the sealed wine bottle and the glass container, solves the problems of complicated operation of the traditional specific gravity bottle method and the alcohol meter method, avoids the use of expensive special devices for detecting alcohol, has wide application objects and has larger field application value.
The technical scheme adopted by the invention is as follows:
the invention comprises a shell, an embedded system circuit board card module, a Raman signal acquisition module, a laser light source module, a laser power control module, a touch screen display control module, a lithium battery, a power management module and a probe, wherein the embedded system circuit board card module, the Raman signal acquisition module, the laser light source module, the lithium battery and the power management module are arranged in the shell; the probe is arranged on the side wall of the shell and is used for carrying out laser excitation and receiving aiming at a closed container containing an alcohol solution sample.
The embedded system circuit board card module controls the laser light source module to emit laser to the probe through the laser power control module, the laser is scattered by alcohol solution in the closed container and then received by the probe, a scattered light receiving signal is extracted by the Raman signal acquisition module to obtain Raman spectrum data and then sent to the embedded system circuit board card module, and the embedded system circuit board card module distinguishes spectrum characteristic peak values and calculates to obtain alcohol concentration.
And the embedded system circuit board card module sends the alcohol concentration result to the touch screen display control module for display output.
The lithium battery and the power management module realize power supply of all modules of the device.
And after receiving the scattered light receiving signals, the Raman signal acquisition module filters and removes Rayleigh scattered signals to obtain Raman signals, converts the Raman signals into Raman spectrum data and sends the Raman spectrum data to the embedded system circuit board card module through the USB interface.
The closed container is made of transparent materials, such as glass.
The closed container can be a wine bottle. The invention can detect the sample containing the pure alcohol solution.
The embedded system circuit board card module is connected with the Raman signal acquisition module through a usb2.0host interface to obtain Raman spectrum data, the embedded system circuit board card module is connected with the laser power control module through an SPI interface to adjust the laser power emitted by the laser light source module, and the embedded system circuit board card module is connected with the TF card through an SDIO to store the data.
The laser power control module receives the control command of the embedded system circuit board card module through the SPI interface, and adjusts and increases or decreases the laser power in a 0 w-5 w variation range.
The embedded system circuit board card module realizes the functions of laser light source module power control, raman spectrum data acquisition and reception, alcohol characteristic peak detection calculation, touch screen interface control and data file storage.
The embedded system circuit board card module is embedded with software written by a Linux system.
2. A method for measuring alcohol concentration of a closed container comprises the following steps:
the embedded system circuit board card module controls the laser light source module to emit laser to the probe through the laser power control module, the laser is scattered by alcohol solution in the closed container and then received by the probe, a scattered light receiving signal is extracted by the Raman signal acquisition module to obtain Raman spectrum data and then sent to the embedded system circuit board card module, and the embedded system circuit board card module processes and distinguishes spectrum characteristic peak values according to the Raman spectrum data and calculates to obtain alcohol concentration.
The embedded system circuit board card module processes and distinguishes spectrum characteristic peak values according to Raman spectrum data and calculates to obtain alcohol concentration, and the method specifically comprises the following steps:
firstly, each sampling signal in the Raman spectrum data is searched in a traversing way by using the following formula (1) to obtain all candidate characteristic peaks:
wherein, m is the peak intensity of the sampling signal; i-the serial number of the sampled signal;
specifically, the peak intensities of the i-1 th, i and i+1 th candidate characteristic peak positions are compared to be used as characteristic peak positions, and all the characteristic peak positions of the alcohol are completed through traversing all the candidate peak positions.
Then taking the candidate characteristic peak with the maximum peak intensity as the alcohol Raman remarkable characteristic peak, and substituting the candidate characteristic peak into the following formula (2) for calculation:
y＝ax+b (2)
wherein, the y-alcohol concentration, the x-alcohol Raman significant characteristic peak value, a and b respectively represent the first concentration coefficient and the second concentration coefficient.
The first concentration coefficient a and the second concentration coefficient b are obtained by linear fitting with the known alcohol concentration of a sample after obtaining peak intensity values of significant characteristic peaks of alcohol Raman by the measuring method through a plurality of alcohol solution samples with known alcohol concentrations.
The invention has the beneficial effects that:
the invention has the advantages of small volume, low cost, simple and convenient operation, nondestructive and rapid detection, no pretreatment on detection samples, direct detection without disassembling a sealed wine bottle and a glass container, and the detection process time only needs 5 seconds, thereby solving the problems of complicated operation of the traditional specific gravity bottle method and the alcohol metering method, avoiding the use of expensive special devices for detecting alcohol, along with wide application objects and great field application value.
Drawings
FIG. 1 is a diagram of an apparatus of the present invention.
Fig. 2 is a flow chart of the operation of the device of the present invention.
Table 1 shows the results of automatic calculation of characteristic peaks of alcohol in the sealed bottled white spirit of the present invention.
Detailed Description
The invention will be further described with reference to the drawings and the specific examples.
As shown in fig. 1, the invention comprises a shell, an embedded system circuit board card module 2, a raman signal acquisition module 3, a laser light source module 6, a laser power control module 5, a touch screen display control module 1, a lithium battery and power management module 7 and a probe 4, wherein the embedded system circuit board card module 2, the raman signal acquisition module 3, the laser light source module 6, the lithium battery and power management module 7 are arranged in the shell, the probe 4 is respectively connected with the raman signal acquisition module 3 and the laser light source module 6 through optical fibers, the laser light source module 6 is connected with the embedded system circuit board card module 2 through the laser power control module 5, the raman signal acquisition module 3 is connected with the embedded system circuit board card module 2, the lithium battery and the power management module 7 are connected with the embedded system circuit board card module 2 for power supply, and the embedded system circuit board card module 2 is connected with the touch screen display control module 1 for display output; the probe 4 is mounted on the side wall of the housing, and the probe 4 performs laser excitation and reception for a closed container containing an alcohol solution sample.
The embedded system circuit board card module 2 controls the laser light source module 6 to emit laser to the probe 4 through the laser power control module 5, the laser is scattered by alcohol solution in the closed container and then received by the probe 4, a scattered light receiving signal is extracted by the Raman signal acquisition module 3 to obtain Raman spectrum data and then sent to the embedded system circuit board card module 2, the embedded system circuit board card module 2 distinguishes spectrum characteristic peak values and calculates to obtain alcohol concentration, and an alcohol concentration result is sent to the touch screen display control module 1 to be displayed and output.
After receiving the scattered light receiving signal, the raman signal acquisition module 3 filters and removes the rayleigh scattered signal, obtains a raman signal, converts the raman signal into raman spectrum data, and sends the raman spectrum data to the embedded system circuit board card module 2 through a USB interface.
The embedded system circuit board card module realizes the functions of power control of the laser light source module, acquisition and reception of Raman spectrum data, detection and calculation of alcohol characteristic peaks, interface control of a touch screen and data file storage. The embedded system circuit board card module 2 is connected with the Raman signal acquisition module 3 through a usb2.0host interface to obtain Raman spectrum data, the embedded system circuit board card module 2 is connected with the laser power control module 5 through an SPI interface to adjust the laser power emitted by the laser light source module 6, and the embedded system circuit board card module 2 is connected with a TF card through an SDIO to store data.
The laser power control module receives the control command of the embedded system circuit board card module through the SPI interface, and adjusts and increases or decreases the laser power in a 0 w-5 w variation range.
The implementation working process of the invention is as follows:
the embedded system circuit board card module 2 is implemented by adopting ARM CORTEX-A8, the ARM CORTEX-A8 is preloaded with a Linux embedded system operating system, the processor frequency of the ARM CORTEX-A8 circuit board card module is 1Ghz, and the on-board memory is 1GB.
The embedded system circuit board card module 2 controls the laser light source module 6 to generate 785nm laser to the probe 4 through the laser power control module 5, the 785nm laser is beaten to the sealed bottled er-top white spirit sample, scattered by the white spirit solution in the sealed bottled er-top white spirit sample and then received by the probe 4, a scattered light receiving signal is extracted by the Raman signal acquisition module 3 to obtain Raman spectrum data, and then the Raman spectrum data is sent to the embedded system circuit board card module 2, and the embedded system circuit board card module 2 processes and distinguishes spectrum characteristic peak values according to the Raman spectrum data and calculates to obtain alcohol concentration.
The embedded system circuit board card module 2 processes the Raman spectrum data, and searches each sampling signal in the Raman spectrum data through the formula (1) to obtain all candidate characteristic peaks. The probe 4 is sampled at intervals, and the scattered light reception signal and raman spectrum data are each constituted by discrete sampled signals. In the specific implementation formula (1), the total number of i is 2048, and i+2 and i-2 exist, so that the numerical range of i is 3 to 2045.
In specific implementations, the characteristic peaks and their corresponding intensity results are shown in table 1:
TABLE 1 automatic calculation of characteristic peaks
The 4 th serial number most significant characteristic peak 879.5cm in all characteristic peak positions of alcohol -1 The intensity value of (2) is the maximum, and is used as the significant characteristic peak of alcohol Raman, and then is substituted into the formula to calculate.
The alcohol concentration is calculated to be 55.8 degrees, the actual concentration of the white spirit of the sealed bottled er-guotou white spirit sample is 56 degrees, and the detection accuracy is 99.6 percent, so that the accuracy of the method is very high.
As can be seen from the implementation steps and the legend, the invention has the advantages of small volume, simple and convenient operation, nondestructive and rapid detection, no need of pretreatment on detection samples, direct detection without disassembling a sealed wine bottle and a glass container, 5 seconds of the whole process, solving the problems of complicated operation of the traditional specific gravity bottle method and the alcohol meter method, avoiding the use of expensive special devices for detecting alcohol, wide application objects and larger field application value.
The above embodiments are intended to illustrate the present invention, not to limit the present invention, and any modifications and equivalent substitutions, improvements, replacement detection objects, etc. made to the present invention fall within the scope of the present invention, within the spirit of the present invention and the scope of the claims.
Claims (4)
1. A method for measuring alcohol concentration in a closed container using an alcohol concentration measuring device for a closed container, comprising: the measuring device comprises a shell, an embedded system circuit board card module (2), a Raman signal acquisition module (3), a laser light source module (6), a laser power control module (5), a touch screen display control module (1), a lithium battery, a power management module (7) and a probe (4), wherein the embedded system circuit board card module (2), the Raman signal acquisition module (3), the laser light source module (3) and the Raman signal acquisition module (3), the laser light source module (6) are arranged in the shell, the Raman signal acquisition module (3) is connected with the embedded system circuit board card module (2), the lithium battery and the power management module (7) are connected with the embedded system circuit board card module (2) for power supply, and the embedded system circuit board card module (2) is connected with the touch screen display control module (1) for display output; the probe (4) is arranged on the side wall of the shell, and the probe (4) performs laser excitation and reception on a closed container containing an alcohol solution sample;
the embedded system circuit board card module (2) controls the laser light source module (6) to emit laser to the probe (4) through the laser power control module (5), the laser is scattered by alcohol solution in the closed container and then received by the probe (4), a scattered light receiving signal is extracted by the Raman signal acquisition module (3) to obtain Raman spectrum data and then sent to the embedded system circuit board card module (2), and the embedded system circuit board card module (2) processes and distinguishes spectrum characteristic peak values according to the Raman spectrum data and calculates to obtain alcohol concentration;
the embedded system circuit board card module (2) processes and distinguishes spectrum characteristic peak values according to Raman spectrum data and calculates to obtain alcohol concentration, and the method specifically comprises the following steps:
firstly, each sampling signal in the Raman spectrum data is searched in a traversing way by using the following formula (1) to obtain all candidate characteristic peaks:
wherein, m is the peak intensity of the sampling signal; i-the serial number of the sampled signal;
then taking the candidate characteristic peak with the maximum peak intensity as the alcohol Raman remarkable characteristic peak, and substituting the candidate characteristic peak into the following formula (2) for calculation:
y＝ax+b(2)
wherein, the y-alcohol concentration, the x-alcohol Raman significant characteristic peak value, a and b respectively represent the first concentration coefficient and the second concentration coefficient.
2. A method for measuring alcohol concentration in a closed vessel using an alcohol concentration measuring apparatus for a closed vessel according to claim 1, wherein: and after receiving the scattered light receiving signals, the Raman signal acquisition module (3) filters and removes Rayleigh scattered signals to obtain Raman signals, converts the Raman signals into Raman spectrum data, and sends the Raman spectrum data to the embedded system circuit board card module (2) through a USB interface.
3. A method for measuring alcohol concentration in a closed vessel using an alcohol concentration measuring apparatus for a closed vessel according to claim 1, wherein: the closed container is made of transparent materials.
4. A method for measuring alcohol concentration in a closed vessel using an alcohol concentration measuring apparatus for a closed vessel according to claim 1, wherein: the embedded system circuit board card module (2) is connected with the Raman signal acquisition module (3) through a usb2.0host interface to obtain Raman spectrum data, the embedded system circuit board card module (2) is connected with the laser power control module (5) through an SPI interface to adjust the laser power emitted by the laser light source module (6), and the embedded system circuit board card module (2) is connected with the TF card through an SDIO to store the data.
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| CN111982790A (en) * | 2020-08-24 | 2020-11-24 | 深圳唯公生物科技有限公司 | Weak light analysis system and method for improving performance of cell and particle analyzer |
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