Portable near infrared spectrum oil product rapid analyzer and analysis method

Abstract

The invention discloses a portable near infrared spectrum oil product rapid analyzer and an analysis method, the portable near infrared spectrum oil product rapid analyzer comprises a shell, a first cavity, a second cavity, a third cavity and a fourth cavity are formed in the shell, a detection device and a spectrometer are arranged in the first cavity, a power supply device is arranged in the second cavity, a constant temperature device is arranged in the third cavity, and the fourth cavity is connected with the detection device. An embedded microcomputer is arranged in the fourth cavity; the constant temperature device is used for guaranteeing constant temperature, the detection device is used for placing and fixing a detection sample, the spectrograph is used for splitting, collecting and sending optical signals, the embedded microcomputer is used for analysis and data processing, and the power supply device is used for supplying power to the whole machine. According to the portable near infrared spectrum oil product rapid analyzer and the analysis method, through cooperative arrangement of the detection device, the spectrograph, the constant temperature device, the embedded microcomputer and the power supply device, rapid detection of multiple indexes of an oil product in a production field is achieved, and meanwhile the analyzer is small in size, light in weight and high in environment adaptability.

Description

Technical Field

[0001] The invention relates to the technical field of oil product analysis, and in particular to a portable near-infrared spectroscopy oil product rapid analyzer and an analysis method. Background Art

[0002] In the process of fuel oil (gasoline, kerosene, diesel) production, use and market supervision, it is necessary to monitor and test the key quality indicators of oil products such as flash point, viscosity, freezing point, distillation range, density, etc. The general practice is usually to take samples on site and send them to the laboratory for testing and analysis of various indicators. However, traditional laboratory instruments are large in size and have single test indicators. They need to be equipped with multiple instruments to complete the detection and analysis of key indicators of oil products. In addition, the analysis cycle is long, the cost is high, the workload is large, and the needs of rapid response and on-site testing cannot be met. Therefore, using one instrument can achieve on-site rapid and accurate detection and analysis of various key quality indicators of fuel oil, which is of practical and important significance to oil production quality control and market supervision.

[0003] Near infrared (NIR) spectroscopy is a non-destructive analysis technology that can measure samples directly without processing. It is widely used in the medical, environmental and biological fields due to its rapid, non-invasive and multi-component simultaneous analysis characteristics. At present, the oil analysis instruments of the near infrared method are basically laboratory instruments, but they are large in size, have fewer analysis indicators for the same sample, are expensive, have high requirements on the environment for use, are cumbersome to maintain, have a large workload, and cannot achieve rapid on-site detection.

[0004] Based on the above situation, the present invention proposes a portable near-infrared spectroscopy rapid oil analyzer and analysis method, which can effectively solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to provide a portable near-infrared spectroscopy rapid oil analyzer and analysis method. The portable near-infrared spectroscopy rapid oil analyzer and analysis method of the present invention are easy to use, and through the coordinated setting of the detection device, the spectrometer, the constant temperature device, the embedded microcomputer and the power supply device, the rapid detection of multiple indicators of oil products at the production site is realized. At the same time, the analyzer is small in size, light in weight, and has strong environmental adaptability.

[0006] The present invention is achieved through the following technical solutions: A portable near-infrared spectroscopy rapid oil analyzer comprises a housing, wherein a thermostat, a detection device, a spectrometer, an embedded microcomputer and a power supply device are arranged in the housing, wherein the thermostat is used to ensure that the temperature of the rapid analyzer is constant during operation, the detection device is used to place and fix the detection sample, provide a light source for sample measurement, and convert the divergent light source into parallel light, the spectrometer is used for light splitting, collection and transmission of optical signals, the embedded microcomputer is used for spectrum collection, analysis, data processing, data display and equipment management, the power supply device is used to power the whole machine, and the embedded microcomputer is respectively connected to the thermostat and the spectrometer for communication; The detection device includes a colorimetric cell, a light source, a cuvette and a lens. A colorimetric slot is provided in the colorimetric cell, stepped through holes are provided on both sides of the colorimetric slot, and lenses are provided in the stepped through holes on both sides. A light source seat is connected to one side of the colorimetric cell, a light source is provided in the light source seat, and the light source seat is connected to the stepped through hole on one side. The cuvette is provided in the colorimetric cell, an opening is provided in the housing at the colorimetric cell, a light shield is provided on the opening, and a spring top screw for fixing the cuvette is provided on the side of the colorimetric cell.

[0007] The purpose of the present invention is to provide a portable near-infrared spectroscopy rapid oil analyzer and analysis method. The portable near-infrared spectroscopy rapid oil analyzer and analysis method of the present invention are easy to use, and through the coordinated setting of the detection device, the spectrometer, the constant temperature device, the embedded microcomputer and the power supply device, the rapid detection of multiple indicators of oil products at the production site is realized. At the same time, the analyzer is small in size, light in weight, and has strong environmental adaptability.

[0008] Preferably, the shell includes a first shell, a second shell, a third shell, a fourth shell and a fifth shell, the first shell is provided with a first accommodating groove and a second accommodating groove on one side, and a third accommodating groove on the other side, the second shell is provided with a fourth accommodating groove on one side, and a fifth accommodating groove on the other side, the first shell is located on one side of the first accommodating groove and connected to the second shell located on one side of the fourth accommodating groove, a first cavity is formed inside the first shell and the second shell, the first shell is located on one side of the second accommodating groove and connected to the third shell, a second cavity is formed inside the first shell and the third shell, the second shell is located on one side of the fifth accommodating groove and connected to the fourth shell, a third cavity is formed inside the second shell and the fourth shell, the first shell is located on one side of the third accommodating groove and connected to the fifth shell, a fourth cavity is formed inside the first shell and the fifth shell, a detection device and a spectrometer are provided in the first cavity, a power supply device is provided in the second cavity, a constant temperature device is provided in the third cavity, an embedded microcomputer is provided in the fourth cavity, a first heat dissipation hole is provided on the second shell, and a second heat dissipation hole is provided at the bottom of the fourth shell.

[0009] Preferably, the constant temperature device includes a constant temperature control circuit board, a heat sink, a fan, a semiconductor refrigerator, a temperature sensor and a gasket. The constant temperature control circuit board is arranged in the shell, and the constant temperature control circuit board is electrically connected to the semiconductor refrigerator and the temperature sensor respectively. One side of the semiconductor refrigerator is connected to the colorimetric cell through a thermally conductive silicone coupling, and the other side is bonded to the heat sink. A fan is fixed on the heat sink. The temperature sensor is used to detect the temperature change of the spectrometer. The constant temperature control circuit board is communicatively connected to the embedded microcomputer, and the gasket is arranged between the shell and the heat sink.

[0010] Preferably, the spectrometer comprises an optical component, a micro-electromechanical array mirror driving board, a shading plate, a signal acquisition board and a spectrum main control board, wherein the spectrum main control board is arranged in a housing, the spectrum main control board is provided with an optical component, a micro-electromechanical array mirror driving board is provided on one side of the optical component, and a signal acquisition board is provided on the other side, the shading plate is fixedly arranged on the top of the optical component, the spectrum main control board is electrically connected to the micro-electromechanical array mirror driving board, the optical component is connected to the step through hole on the other side, and the spectrum main control board is communicatively connected to an embedded microcomputer; The optical component includes an optical housing and an optical lens, the optical lens is arranged in the optical housing, the micro-electromechanical array mirror driving board includes a microcomputer MCU controller and a micro-motor driver, the microcomputer MCU controller is electrically connected to the micro-motor driver, the signal acquisition board includes an InGaAs detector and an operational amplifier, the InGaAs detector is electrically connected to the operational amplifier, the spectrum main control board includes a main control MCU controller and a communication interface, the main control MCU controller is electrically connected to the communication interface, and the micro-electromechanical array mirror driving board is used to drive the optical lens.

[0011] Preferably, the embedded microcomputer is equipped with a management system, which includes a sample detection module, a parameter setting module, a data management module and a device management module. The sample detection module includes a blank analysis unit, a sample analysis unit, a standard sample analysis unit and a spectrum modeling unit. The parameter setting module includes a constant temperature parameter setting unit, a correction parameter setting unit and a user interface setting unit. The data management module includes a data query unit, a data backup unit and a user management unit. The device management module includes a log query unit, a function detection unit and a component management unit.

[0012] Preferably, the power supply device includes a lithium battery pack and a charging control board, and the charging control board is electrically connected to the lithium battery pack.

[0013] According to another invention of the present invention, there is provided an analysis method of a portable near-infrared spectroscopy oil rapid analyzer, comprising the following steps: Step S1: preheat the analyzer for 30 minutes, and the constant temperature area of ​​the analyzer is automatically set to 27°C; Step S2: Put an empty cuvette in the cuvette pool, cover the light shield, select blank test in the management system, and the system starts scanning and collecting blank spectra; Step S3: placing calibration sample A, calibration sample B, and calibration sample C in the cuvette in sequence, and collecting calibration sample spectra, wherein the calibration sample spectra need only be collected once a day; Step S4: placing the sample to be tested in the cuvette and collecting the unknown sample spectrum; Step S5: The embedded microcomputer performs spectrum preprocessing to remove invalid spectrum bands; Step S6: Call the sample prediction and correction model to perform peak spectrum recognition and calculation, identify the sample brand number, and calculate the sample index.

[0014] Preferably, the specific steps of step S1 are: Step S11: Turn on the light source and enter the preheating state; Step S12: the embedded microcomputer collects the temperature of the constant temperature area through the temperature sensor and compares it with the set temperature, and uses a semiconductor refrigeration chip to control the temperature of the constant temperature area at the set temperature; When the set temperature is higher than the temperature in the constant temperature area, the semiconductor refrigeration chip turns on the heating mode, and the heat sink and fan quickly discharge the cold source generated by the semiconductor refrigeration chip; When the set temperature is lower than the temperature in the constant temperature area, the semiconductor refrigeration chip starts the cooling mode, and the heat sink and fan quickly discharge the heat source generated by the semiconductor refrigeration chip.

[0015] Preferably, the specific steps of collecting the spectrum are: Step S31: the cuvette is kept blank or a corresponding sample is placed in the cuvette, and a light shield is covered; Step S32: Click to start the test in the management system.

[0016] Preferably, the sample indicators include flash point, density, freezing point, solidification point, 20°C viscosity, -20°C viscosity, initial distillation point, 10% distillation range, 20% distillation range, 50% distillation range, 90% distillation range and final distillation point.

[0017] Compared with the prior art, the present invention has the following advantages and beneficial effects: 1. The portable design based on near-infrared technology is suitable for on-site detection of fuel oil and market quality supervision. It can simultaneously realize the detection of 12 indicators including oil brand identification, flash point, density, freezing point, solidification point, 20℃ viscosity, -20℃ viscosity, initial distillation point, 10% distillation range, 20 / % distillation range, 50% distillation range, 90% distillation range and final distillation point.

[0018] 2. The detection speed is fast. It can complete the detection of 12 oil indicators and oil brand identification in 15 seconds. The detection time is negligible compared with the time taken by laboratory instruments, which effectively improves the detection efficiency, reduces the workload, and greatly reduces the instruments required for oil indicator detection.

[0019] 3. The colorimetric cell and spectrometer are kept at a constant temperature over the entire area, and the instrument has strong environmental adaptability, overcoming the impact of ambient temperature changes on the instrument's detection accuracy, improving stability, and having strong environmental adaptability.

[0020] 4. The integrated colorimetric cell structure design integrates the light source, colorimetric cell, and optical path conversion. The non-separation structure makes the optical path more stable, and the volume is only 1 / 3 of the colorimetric cell of conventional optical equipment.

[0021] 5. The heat sink is made of T1 copper and is designed with heat dissipation blades with a spacing of 3mm and a thickness of 0.5mm. The heat dissipation efficiency is increased by 3 times under the same volume. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 It is another perspective structural schematic diagram of the present invention; Figure 3 It is a schematic diagram of the top view structure of the present invention; Figure 4 for Figure 3 Schematic diagram of the cross-sectional structure at AA in the middle; Figure 5 This is a schematic structural diagram of the first shell of the present invention; Figure 6 This is a schematic structural diagram of the first shell of the present invention from another viewing angle; Figure 7 is a schematic structural diagram of the second shell of the present invention; Figure 8 This is a schematic structural diagram of the second housing of the present invention from another viewing angle; Fig. 9 is a schematic structural diagram of the third housing of the present invention; Fig.10 is a schematic structural diagram of the fourth housing of the present invention; Fig.11 is a schematic structural diagram of the fifth housing of the present invention; Fig.12 The structural schematic diagram of the first shell, the second shell and the fourth shell is hidden for the present invention; Fig.13 It is a structural schematic diagram of the spectrometer of the present invention; Fig.14 A schematic diagram of the structure of the spectrometer of the present invention from another viewing angle; Fig.15 It is a schematic diagram of the structure of the detection device (excluding the cuvette) of the present invention; Fig.16 It is a schematic diagram of the cross-sectional structure of the detection device of the present invention.

[0023] In the figure: 1-constant temperature device; 11-constant temperature control circuit board; 12-heat sink; 13-fan; 14-semiconductor cooling sheet; 15-temperature sensor; 16-gasket; 2-detection device; 21-colorimetric cell; 22-light source; 23-colorimetric dish; 24-lens; 25-light source holder; 26-light shield; 27-spring top screw; 3-spectrometer; 31-optical components; 32-microelectromechanical array mirror drive board; 33-light shielding plate; 34-signal acquisition board; 35-spectrum main control board; 4-housing; 41-first housing; 411-first receiving slot; 412-second receiving slot; 413-third receiving slot; 42-second housing; 421-fourth receiving slot; 422-fifth receiving slot; 423-first heat dissipation hole; 43-third housing; 44-fourth housing; 441-second heat dissipation hole; 45-fifth housing; 46-first cavity; 47-second cavity; 48-third cavity; 49-fourth cavity; 5-power supply device; 51-lithium battery pack; 52-charging control board. DETAILED DESCRIPTION

[0024] In order to enable those skilled in the art to better understand the technical solution of the present invention, the preferred implementation scheme of the present invention is described below in conjunction with specific embodiments. However, it should be understood that the drawings are only used for exemplary description and cannot be understood as a limitation on this patent. In order to better illustrate this embodiment, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted. The positional relationship described in the drawings is only for exemplary description and cannot be understood as a limitation on this patent.

[0025] The constant temperature control circuit board, temperature sensor, microcomputer MCU controller and micromotor driver, InGaAs detector, operational amplifier, main control MCU controller, embedded microcomputer, power supply device and other technical features (constituent units / elements of the present invention) described in the present invention are obtained from conventional commercial channels or prepared by conventional methods unless otherwise specified. Their specific structures, working principles, and possible control methods and spatial layout methods can be selected conventionally in the field and should not be regarded as the innovative points of the present invention. They are understandable to those skilled in the art, and the patent of the present invention will not be further elaborated.

[0026] Embodiment 1: like Figures 1 to 16 As shown, the present invention provides a portable near-infrared spectroscopy oil rapid analyzer, which is mainly composed of seven parts, namely, a constant temperature device 1, a detection device 2, a spectrometer 3, a housing 4, a power supply device 5, an embedded microcomputer (not shown in the figure) and a management system. The constant temperature device 1 is used to ensure that the temperature of the rapid analyzer is constant during operation, the detection device 2 is used to place and fix the test sample, provide a light source 22 for sample measurement, and convert the divergent light source 22 into parallel light, the spectrometer 3 is used for light splitting, collection and transmission of optical signals, the embedded microcomputer is used for spectrum collection, analysis, data processing, data display and equipment management, the power supply device 5 is used to power the rapid analyzer, and the embedded microcomputer is respectively connected to the constant temperature device 1 and the spectrometer 3 for communication, and the embedded microcomputer can communicate with the constant temperature device 1 and the spectrometer 3.

[0027] The detection device 2 includes a colorimetric cell 21, a light source 22, a colorimetric dish 23 and a lens 24. The colorimetric cell 21 is an integrated special-shaped structure, shaped as follows: Fig.15 and 16 As shown, 2A12 aluminum alloy is selected as the material. After processing, the whole is oxidized and blackened, which can effectively reduce stray light and light scattering. The middle of the colorimetric cell 21 protrudes longitudinally, and a square colorimetric groove with an inner diameter of 13.5 mm is designed inside for placing and fixing the colorimetric cell 23. Two pressing screws are designed on the inner wall to ensure the accuracy of the position of the colorimetric cell 23 each time, and reduce the measurement error caused by the position deviation of the colorimetric cell 23. Two layers of stepped through holes are designed at the center of the colorimetric groove at the bottom of the colorimetric cell 21, such as Fig.16 As shown, the inner step through hole is used for installing the lens 24, and the right outer step hole is used for installing the light source holder 25. The light source holder 25 is made of aluminum, which is oxidized black as a whole, and is used for installing and fixing the light source 22. The outside is connected to the colorimetric cell 21 through the lamp holder fixing screw; the lamp holder fixing screw is made of stainless steel 304 and is blackened; the light source holder 25 is provided with a light source 22, and the light source holder 25 is connected with the step through hole on one side, and the cuvette 23 is arranged in the colorimetric cell. The cuvette 23 is used for detecting fuel oil samples, and is made of CaF2. When in use, the sample is poured into the cuvette 23, and then inserted into the colorimetric cell; the lens 24 is composed of two double convex mirrors, which are used to convert the divergent infrared light into parallel light. The two lenses 24 are respectively installed on both sides of the colorimetric cell and are symmetrically distributed; the housing 4 is provided with an opening at the colorimetric cell 21, and a light shield 26 is provided on the opening. The light shield 26 is used to shield the opening of the cuvette 23 during sample detection. The side of the colorimetric tank is provided with a spring top screw 27 for fixing the colorimetric cell 23. The spring top screw 27 is made of 304 stainless steel and has a hemispherical top design. The spring top screw 27 is used to fix the position of the colorimetric cell 23.

[0028] Embodiment 2: like Figures 1 to 16 As shown, the present invention provides a portable near-infrared spectroscopy oil rapid analyzer, which is mainly composed of seven parts, namely, a constant temperature device 1, a detection device 2, a spectrometer 3, a housing 4, a power supply device 5, an embedded microcomputer and a management system. The constant temperature device 1 is used to ensure that the temperature of the rapid analyzer is constant during operation, the detection device 2 is used to place and fix the test sample, provide a light source 22 for sample measurement, and convert the divergent light source 22 into parallel light, the spectrometer 3 is used for light splitting, collection and transmission of optical signals, the embedded microcomputer is used for spectrum collection, analysis, data processing, data display and equipment management, the power supply device 5 is used to power the rapid analyzer, and the embedded microcomputer is respectively connected to the constant temperature device 1 and the spectrometer 3 for communication, and the embedded microcomputer can communicate with the constant temperature device 1 and the spectrometer 3.

[0029] The detection device 2 includes a colorimetric cell 21, a light source 22, a colorimetric dish 23 and a lens 24. The colorimetric cell 21 is an integrated special-shaped structure, shaped as follows: Fig.15 and 16 As shown, 2A12 aluminum alloy is selected as the material. After processing, the whole is oxidized and blackened, which can effectively reduce stray light and light scattering. The middle of the colorimetric cell 21 protrudes longitudinally, and a square colorimetric groove with an inner diameter of 13.5 mm is designed inside for placing and fixing the colorimetric cell 23. Two pressing screws are designed on the inner wall to ensure the accuracy of the position of the colorimetric cell 23 each time, and reduce the measurement error caused by the position deviation of the colorimetric cell 23. Two layers of stepped through holes are designed at the center of the colorimetric groove at the bottom of the colorimetric cell 21, such as Fig.16 As shown, the inner step through hole is used for installing the lens 24, and the right outer step hole is used for installing the light source holder 25. The light source holder 25 is made of aluminum, which is oxidized black as a whole, and is used for installing and fixing the light source 22. The outside is connected to the colorimetric cell 21 through the lamp holder fixing screw; the lamp holder fixing screw is made of stainless steel 304 and is blackened; the light source holder 25 is provided with a light source 22, and the light source holder 25 is connected with the step through hole on one side, and the cuvette 23 is arranged in the colorimetric cell. The cuvette 23 is used for detecting fuel oil samples, and is made of CaF2. When in use, the sample is poured into the cuvette 23, and then inserted into the colorimetric cell; the lens 24 is composed of two double convex mirrors, which are used to convert the divergent infrared light into parallel light. The two lenses 24 are respectively installed on both sides of the colorimetric cell and are symmetrically distributed; the housing 4 is provided with an opening at the colorimetric cell 21, and a light shield 26 is provided on the opening. The light shield 26 is used to shield the opening of the cuvette 23 during sample detection. The side of the colorimetric tank is provided with a spring top screw 27 for fixing the colorimetric cell 23. The spring top screw 27 is made of 304 stainless steel and has a hemispherical top design. The spring top screw 27 is used to fix the position of the colorimetric cell 23.

[0030] The housing 4 includes a first shell 41, a second shell 42, a third shell 43, a fourth shell 44 and a fifth shell 45. The first shell 41 is provided with a first receiving groove 411 and a second receiving groove 412 on one side, and a third receiving groove 413 on the other side. The second shell 42 is provided with a fourth receiving groove 421 on one side, and a fifth receiving groove 422 on the other side. After the first shell 41 is assembled near the first receiving groove 411 and the second shell 42 is assembled near the fourth receiving groove 421, a first cavity 46 is formed inside. After the first shell 41 is assembled near the second receiving groove 412 and the third shell 43, a second cavity 47 is formed inside. After the body 42 is assembled with the fourth shell 44 near the fifth accommodating groove 422, a third cavity 48 is formed inside. After the first shell 41 is assembled with the fifth shell 45 near the third accommodating groove 413, a fourth cavity 49 is formed inside. The detection device 2 and the spectrometer 3 are arranged together in the first cavity 46, the power supply device 5 is arranged in the second cavity 47, the constant temperature device 1 is arranged in the third cavity 48, and the embedded microcomputer is arranged in the fourth cavity 49. The second shell 42 is provided with a first heat dissipation hole 423, and the bottom of the fourth shell 44 is provided with a second heat dissipation hole 441. The first heat dissipation hole 423 and the second heat dissipation hole 441 are both used to dissipate heat for the constant temperature device 1.

[0031] Further, in another embodiment, the constant temperature device 1 includes a constant temperature control circuit board 11, a heat sink 12, a fan 13, a semiconductor refrigeration sheet 14, a temperature sensor 15 and a gasket 16. The constant temperature control circuit board 11 is arranged in the housing 4. The constant temperature control circuit board 11 is the control center of the constant temperature module, and is composed of a constant temperature MCU controller, a relay, a communication interface, a temperature acquisition interface, etc. The constant temperature control circuit board 11 is electrically connected to the semiconductor refrigeration sheet 14 and the temperature sensor 15 respectively. The constant temperature control circuit board 11 is responsible for collecting the temperature sensor 15 signal, and controls the output power of the semiconductor refrigeration sheet 14 by comparing the set temperature parameters, so as to achieve the purpose of controlling the temperature constant, and transmits the collected temperature signal to the management system in real time through the communication interface. One side of the semiconductor refrigeration sheet 14 is coupled with the colorimetric cell 21 by thermal conductive silicone, and the other side is bonded to the heat sink 12. The heat sink 12 is made of T1 copper and is a rectangle with a size of 50mm*68mm. The thermal conductivity is 401W / mK, and the designed heat dissipation power is 20W. A fan 13 is installed above the heat sink 12. The size of the fan 13 is 50mm*50mm. It is driven by a 5V voltage to improve the heat dissipation efficiency. When in use, one side of the semiconductor refrigeration plate 14 is firmly attached to the bottom of the colorimetric cell 21 through thermal conductive silicone coupling, and the other side is firmly attached to the plane side of the heat sink 12. The temperature sensor 15 is used to detect the temperature change of the spectrometer 3. The model of the temperature sensor 15 is 18B20, single-line digital temperature acquisition, and the resolution is 0.06°C. The temperature sensor 15 is installed on the lateral metal surface of the optical component 31; the constant temperature control circuit board 11 is connected to the embedded microcomputer for communication. The gasket 16 is made of silicone, which is heat-resistant and corrosion-resistant, with a thickness of 0.5mm, a hollow middle, and a 2mm wide edge. It is installed between the outer shell 4 and the heat sink 12 to seal the space inside the outer shell 4 to prevent dust from entering the optical component 31, and also to reduce air convection and keep the internal temperature constant.

[0032] The outer side of the heat sink 12 is connected to the fan 13, forming a heat dissipation area with the housing 4, and the heat dissipation area faces the atmosphere. The inner side of the heat sink 12 is connected to the semiconductor cooling sheet 14, forming a closed space with the housing 4 to keep a constant temperature.

[0033] Further, in another embodiment, the spectrometer 3 includes an optical component 31, a micro-electromechanical array mirror driving board 32, a shading plate 33, a signal acquisition board 34, and a spectrum main control board 35. The spectrum main control board 35 is arranged in the housing 4, and the optical component 31 is arranged on the spectrum main control board 35. The micro-electromechanical array mirror driving board 32 is arranged on one side of the optical component 31, and the signal acquisition board 34 is arranged on the other side. The shading plate 33 is made of black ABS material with a matte surface treatment, which is used for shading the optical component 31 and is connected to the top of the optical component 31 by screws. The spectrum main control board 35 is electrically connected to the micro-electromechanical array mirror driving board 32, the optical component 31 is connected to the step through hole on the other side, and the spectrum main control board 35 is communicatively connected to the embedded microcomputer; The optical component 31 includes an optical housing and an optical lens. The optical housing is made of 2A12 aluminum alloy and is blackened as a whole. It has a built-in optical lens for splitting infrared light signals. The split infrared signals are sent to a signal acquisition board 34 for collection. A micro-electromechanical array mirror drive board 32 is composed of a microcomputer MCU controller and a micro-motor driver, and is used to control the angle change of the optical lens of the optical component 31 to achieve splitting processing of infrared light signals. The microcomputer MCU controller is electrically connected to the micro-motor driver. The signal acquisition board 34 is composed of an InGaAs detector, an operational amplifier, etc., and is used to convert optical signals into electrical signals and send them to a spectrum main control board 35 after amplification to achieve optical signal collection. The spectrum main control board 35 is the control core of the spectrometer 3, and is used to control optical path conversion, signal collection, light source 22 control, etc. It is composed of a main control MCU controller, a communication interface, etc.

[0034] Further, in another embodiment, the embedded microcomputer is used to install the instrument management system, which is connected to the spectrum main control board 35 and the constant temperature control circuit board 11 respectively through communication interfaces such as USB and RS232, and the collection of spectrum signals and temperature signals is realized through the management system, and the embedded microcomputer is embedded in the housing 4. The management system includes a sample detection module, a parameter setting module, a data management module and a device management module, the sample detection module includes a blank analysis unit, a sample analysis unit, a standard sample analysis unit and a spectrum modeling unit, the parameter setting module includes a constant temperature parameter setting unit, a calibration parameter setting unit and a user interface setting unit, the data management module includes a data query unit, a data backup unit and a user management unit, and the device management module includes a log query unit, a function detection unit and a component management unit.

[0035] Furthermore, in another embodiment, the power supply device 5 is responsible for supplying power to the entire device, and includes a lithium battery pack 51 and a charging control board 52 , and the charging control board 52 is electrically connected to the lithium battery pack 51 .

[0036] The lithium battery pack 51 is a ternary iron lithium battery with a capacity of 3.7V22AH, which is used for the overall power supply of the instrument; the charging control board 52 is composed of a lithium battery charging control chip, a power display and a Type-C charging port, and is responsible for the charging management and power monitoring of the lithium battery pack 51.

[0037] The embodiment of the present invention also provides an analysis method of a portable near-infrared spectroscopy oil rapid analyzer, comprising the following steps: Step S1: preheat the analyzer for 30 minutes, and the constant temperature area of ​​the analyzer is automatically set to 27°C; Step S2: Place an empty cuvette 23 in the cuvette pool 21, cover the light shield 26, select the blank test in the management system, and the system starts scanning and collecting blank spectra; Spectrum scanning process: The divergent light generated by the light source 22 passes through the first lens 24, and the divergent light is converted into parallel light to avoid the loss of light energy caused by the change in the optical path distance. The parallel light passes through the cuvette 23 and enters the second lens 24 to convert the parallel light into convergent light. When the light passes through the cuvette 23, the structure and composition information inside the substance is obtained by utilizing the absorption and reflection characteristics of the measured substance to near-infrared light.

[0038] In oil testing, near-infrared spectroscopy identifies the vibration modes of functional groups such as carbon-hydrogen bonds and oxygen-hydrogen bonds in oil, thereby inferring the chemical composition and physical properties of oil. The converged light enters the spectrometer 3 through the slit, passes through the lens 24 and the optical lens, and then enters the InGaAs detector. The InGaAs detector converts the optical signal into an electrical signal, and then enters the spectrum main control board 35 to collect digital signals after signal amplification. During the collection process, the micro-electromechanical array mirror driver board 32 continuously controls the optical lens to adjust the angle for splitting, so as to collect light signals of different wavelengths to form spectral information. The management system collects the spectrum information formed by the spectrometer 3 through the USB communication interface and displays it.

[0039] Step S3: Place calibration sample A, calibration sample B, and calibration sample C in the cuvette 23 in sequence, and collect calibration sample spectra, wherein the calibration sample spectra only need to be collected once a day; the collection of sample spectra will vary with the different collection conditions, and there are two main parts: changes in environmental conditions and changes in the instrument itself. Environmental conditions include temperature, humidity, air pressure, etc., among which temperature has the greatest impact. This application solves the impact of temperature changes through global constant temperature. The impact of humidity and air pressure on the spectra is unknown and relatively complex, and it is difficult to correct through the model. The instrument itself changes with the use time, and factors such as the attenuation of the light source 22 and the aging of the device will affect the spectrum collection, thereby affecting the accuracy of the instrument detection, so the instrument needs to be calibrated before each detection. By collecting the spectra of calibration samples A, calibration samples B, and calibration samples C, the spectrum of the sample to be tested is corrected to achieve the purpose of improving the accuracy of instrument detection.

[0040] Step S4: Put the sample to be tested into the cuvette 23, and click the sample detection button to collect the spectrum of the sample to be tested. The collection method is consistent with the calibration sample spectrum collection process.

[0041] Step S5: The embedded microcomputer performs spectrum preprocessing to remove invalid spectrum bands; Step S6: Call the sample prediction and correction model to perform peak spectrum recognition and calculation, identify the sample brand, and calculate the sample index. The recognition and calculation of the model library have different applications for different scenarios. The main algorithms are principal component regression and partial least squares, which are the commonly used mainstream algorithms for near-infrared. Since the characteristic peaks of different oil products are different, the brand of the tested sample is judged according to the existing data model, such as 3# aviation kerosene, 92# gasoline, 0# diesel, etc. Then, according to the correlation of the model peak spectrum, calculate the fuel oil related parameters, such as flash point, density, kinematic viscosity and other indicators. Among them, the existing data model first collects the known parameter sample spectrum to establish a model, and then collects the unknown sample spectrum according to the model for calculation and input into the management system.

[0042] Furthermore, in another embodiment, the specific steps of step S1 are: Step S11: Turn on the light source 22 and enter the preheating state; Step S12: The embedded microcomputer collects the temperature of the constant temperature area through the temperature sensor 15 and compares it with the set temperature, and uses the semiconductor refrigeration plate 14 to control the temperature of the constant temperature area at the set temperature; PID control technology is used to adjust the current direction, power on and off the semiconductor refrigeration plate 14 to achieve temperature rise and fall control.

[0043] When the set temperature is higher than the temperature in the constant temperature area, the semiconductor refrigeration chip 14 turns on the heating mode, the constant temperature control circuit board 11 provides a forward current to the refrigeration chip, the temperature of the refrigeration chip and the instrument bonding surface begins to rise, and the heat sink 12 and the fan 13 quickly discharge the cold source generated by the semiconductor refrigeration chip 14 to ensure the heating effect of the semiconductor refrigeration chip 14; When the set temperature is lower than the temperature in the constant temperature area, the semiconductor refrigeration chip 14 starts the cooling mode, the constant temperature control circuit board 11 provides reverse current to the semiconductor refrigeration chip 14, and the heat sink 12 and the fan 13 quickly discharge the heat source generated by the semiconductor refrigeration chip 14.

[0044] Further, in another embodiment, the specific steps of collecting the spectrum are: Step S31: the cuvette 23 is kept blank or a corresponding sample is placed in the cuvette 23, and the light shield 26 is covered; Step S32: Click to start the test in the management system.

[0045] Furthermore, in another embodiment, the sample indicators include flash point, density, freezing point, solidification point, 20°C viscosity, -20°C viscosity, initial distillation point, 10% distillation range, 20% distillation range, 50% distillation range, 90% distillation range and final distillation point.

[0046] According to the description and drawings of the present invention, those skilled in the art can easily manufacture or use the portable near-infrared spectroscopy rapid oil analyzer and analysis method of the present invention, and can produce the positive effects recorded in the present invention.

[0047] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any simple modification or equivalent change made to the above embodiment based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A portable near-infrared spectroscopy oil rapid analyzer, characterized in that: It comprises a shell, in which a thermostat, a detection device, a spectrometer, an embedded microcomputer and a power supply device are arranged, the thermostat is used to ensure that the temperature of the rapid analyzer is constant during operation, the detection device is used to place and fix the detection sample, provide a light source for sample measurement, and convert the divergent light source into parallel light, the spectrometer is used for light splitting, collection and transmission of optical signals, the embedded microcomputer is used for spectrum collection, analysis, data processing, data display and equipment management, the power supply device is used to power the whole machine, and the embedded microcomputer is respectively connected to the thermostat and the spectrometer for communication; The detection device includes a colorimetric cell, a light source, a cuvette and a lens. A colorimetric slot is provided in the colorimetric cell, stepped through holes are provided on both sides of the colorimetric slot, and lenses are provided in the stepped through holes on both sides. A light source seat is connected to one side of the colorimetric cell, a light source is provided in the light source seat, and the light source seat is connected to the stepped through hole on one side. The cuvette is provided in the colorimetric cell, an opening is provided in the housing at the colorimetric cell, a light shield is provided on the opening, and a spring top screw for fixing the cuvette is provided on the side of the colorimetric cell.

2. The portable near-infrared spectroscopy rapid oil analyzer according to claim 1 is characterized in that: The shell includes a first shell, a second shell, a third shell, a fourth shell and a fifth shell. The first shell is provided with a first accommodating groove and a second accommodating groove on one side, and a third accommodating groove on the other side. The second shell is provided with a fourth accommodating groove on one side, and a fifth accommodating groove on the other side. The first shell is located on one side of the first accommodating groove and connected to the second shell on one side of the fourth accommodating groove. A first cavity is formed inside the first shell and the second shell. The first shell is located on one side of the second accommodating groove and connected to the third shell. A second cavity is formed inside the first shell and the third shell. The second shell is located on one side of the fifth accommodating groove and connected to the fourth shell. A third cavity is formed inside the second shell and the fourth shell. The first shell is located on one side of the third accommodating groove and connected to the fifth shell. A fourth cavity is formed inside the first shell and the fifth shell. A detection device and a spectrometer are provided in the first cavity. A power supply device is provided in the second cavity. A constant temperature device is provided in the third cavity. An embedded microcomputer is provided in the fourth cavity. A first heat dissipation hole is provided on the second shell, and a second heat dissipation hole is provided at the bottom of the fourth shell.

3. The portable near-infrared spectroscopy rapid oil analyzer according to claim 1 is characterized in that: The constant temperature device includes a constant temperature control circuit board, a heat sink, a fan, a semiconductor refrigeration sheet, a temperature sensor and a gasket. The constant temperature control circuit board is arranged in the shell, and the constant temperature control circuit board is electrically connected to the semiconductor refrigeration sheet and the temperature sensor respectively. One side of the semiconductor refrigeration sheet is connected to the colorimetric cell through a thermally conductive silicone coupling, and the other side is bonded to the heat sink. A fan is fixed on the heat sink. The temperature sensor is used to detect the temperature change of the spectrometer. The constant temperature control circuit board is communicatively connected to the embedded microcomputer, and the gasket is arranged between the shell and the heat sink.

4. The portable near-infrared spectroscopy rapid oil analyzer according to claim 1 is characterized in that: The spectrometer comprises an optical component, a micro-electromechanical array mirror driving board, a shading plate, a signal acquisition board and a spectrum main control board. The spectrum main control board is arranged in a housing, the spectrum main control board is provided with an optical component, a micro-electromechanical array mirror driving board is arranged on one side of the optical component, and a signal acquisition board is arranged on the other side. The shading plate is fixedly arranged on the top of the optical component, the spectrum main control board is electrically connected to the micro-electromechanical array mirror driving board, the optical component is connected to the step through hole on the other side, and the spectrum main control board is communicatively connected to the embedded microcomputer; The optical component includes an optical housing and an optical lens, the optical lens is arranged in the optical housing, the micro-electromechanical array mirror driving board includes a microcomputer MCU controller and a micro-motor driver, the microcomputer MCU controller is electrically connected to the micro-motor driver, the signal acquisition board includes an InGaAs detector and an operational amplifier, the InGaAs detector is electrically connected to the operational amplifier, the spectrum main control board includes a main control MCU controller and a communication interface, the main control MCU controller is electrically connected to the communication interface, and the micro-electromechanical array mirror driving board is used to drive the optical lens.

5. The portable near-infrared spectroscopy rapid oil analyzer according to claim 1 is characterized in that: The embedded microcomputer is equipped with a management system, which includes a sample detection module, a parameter setting module, a data management module and a device management module. The sample detection module includes a blank analysis unit, a sample analysis unit, a standard sample analysis unit and a spectrum modeling unit. The parameter setting module includes a constant temperature parameter setting unit, a correction parameter setting unit and a user interface setting unit. The data management module includes a data query unit, a data backup unit and a user management unit. The device management module includes a log query unit, a function detection unit and a component management unit.

6. The portable near-infrared spectroscopy rapid oil analyzer according to claim 1 is characterized in that: The power supply device comprises a lithium battery pack and a charging control board, and the charging control board is electrically connected to the lithium battery pack.

7. An analysis method of the portable near-infrared spectroscopy rapid oil analyzer according to any one of claims 1 to 6, characterized in that: The following steps are included: Step S1: preheat the analyzer for 30 minutes, and the constant temperature area of ​​the analyzer is automatically set to 27°C; Step S2: Put an empty cuvette in the cuvette pool, cover the light shield, select blank test in the management system, and the system starts scanning and collecting blank spectra; Step S3: placing calibration sample A, calibration sample B, and calibration sample C in the cuvette in sequence, and collecting calibration sample spectra, wherein the calibration sample spectra need only be collected once a day; Step S4: placing the sample to be tested in the cuvette and collecting the unknown sample spectrum; Step S5: The embedded microcomputer performs spectrum preprocessing to remove invalid spectrum bands; Step S6: Call the sample prediction and correction model to perform peak spectrum recognition and calculation, identify the sample brand number, and calculate the sample index.

8. The analysis method of the portable near-infrared spectroscopy rapid oil analyzer according to claim 7 is characterized in that: The specific steps of step S1 are: Step S11: Turn on the light source and enter the preheating state; Step S12: the embedded microcomputer collects the temperature of the constant temperature area through the temperature sensor and compares it with the set temperature, and uses a semiconductor refrigeration chip to control the temperature of the constant temperature area at the set temperature; When the set temperature is higher than the temperature in the constant temperature area, the semiconductor refrigeration chip turns on the heating mode, and the heat sink and fan quickly discharge the cold source generated by the semiconductor refrigeration chip; When the set temperature is lower than the temperature in the constant temperature area, the semiconductor refrigeration chip starts the cooling mode, and the heat sink and fan quickly discharge the heat source generated by the semiconductor refrigeration chip.

9. The analysis method of the portable near-infrared spectroscopy rapid oil analyzer according to claim 7 is characterized in that: The specific steps for collecting the spectrum are: Step S31: the cuvette is kept blank or a corresponding sample is placed in the cuvette, and a light shield is covered; Step S32: Click to start the test in the management system.

10. The analysis method of the portable near-infrared spectroscopy rapid oil analyzer according to claim 7 is characterized in that: The sample indicators include flash point, density, freezing point, solidification point, viscosity at 20°C, viscosity at -20°C, initial distillation point, 10% distillation range, 20% distillation range, 50% distillation range, 90% distillation range and final distillation point.

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