CN107957407B - Probe type digital display refractometer - Google Patents
Probe type digital display refractometer Download PDFInfo
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- CN107957407B CN107957407B CN201711169474.9A CN201711169474A CN107957407B CN 107957407 B CN107957407 B CN 107957407B CN 201711169474 A CN201711169474 A CN 201711169474A CN 107957407 B CN107957407 B CN 107957407B
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- 239000000523 sample Substances 0.000 title claims abstract description 59
- 239000013307 optical fiber Substances 0.000 claims abstract description 45
- 230000003287 optical effect Effects 0.000 claims abstract description 17
- 238000012545 processing Methods 0.000 claims description 23
- 239000000835 fiber Substances 0.000 claims description 11
- 239000011521 glass Substances 0.000 claims description 3
- 238000005259 measurement Methods 0.000 abstract description 18
- 238000005070 sampling Methods 0.000 abstract description 5
- 230000000007 visual effect Effects 0.000 abstract description 4
- 238000013461 design Methods 0.000 abstract description 3
- 239000007788 liquid Substances 0.000 description 12
- 239000000126 substance Substances 0.000 description 9
- 238000000034 method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 239000012535 impurity Substances 0.000 description 2
- 239000004973 liquid crystal related substance Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 239000004922 lacquer Substances 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/41—Refractivity; Phase-affecting properties, e.g. optical path length
- G01N21/4133—Refractometers, e.g. differential
-
- G—PHYSICS
- G01—MEASURING; TESTING
- 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
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
-
- G—PHYSICS
- G01—MEASURING; TESTING
- 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
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
- G01N2021/0106—General arrangement of respective parts
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The utility model provides a probe formula digital display refractometer, includes host computer (1) and probe (7), characterized by: the inner part of the host machine (1) is divided into an upper layer and a lower layer, the upper layer in the host machine (1) is provided with an optical signal emitting side, the lower layer in the host machine (1) is provided with an optical signal receiving side, an optical fiber interface (6) is arranged on one side wall of the host machine (1), an optical fiber connector (9) is connected with the optical fiber interface (6), the optical fiber connector (9) is connected with a probe (7) through an optical fiber (8), and a display screen (2), a switch key (3), a calibration key (4) and a locking key (5) are respectively arranged on the upper surface of the host machine (1); the invention overcomes the influence of visual reading errors in the prior art, realizes real-time online measurement of refractive index in a certain range, can realize non-sampling measurement in an interventional environment of the probe, greatly reduces the size of the probe through the design of an optical path, and is suitable for oil product measurement, sugar measurement and other applications.
Description
Technical Field
The invention relates to a refractometer, in particular to a probe type online digital refractometer, and belongs to the field of liquid concentration and refractive index measuring devices.
Background
The refractive index is one of important physical constants of substances, the refractive index is closely related to the concentration of a solution, and many pure substances have a certain refractive index, if impurities are contained in the pure substances, the refractive index changes, deviation occurs, and the more the impurities are, the larger the deviation is. Therefore, by measuring the refractive index, the purity of the substance can be measured. Abbe refractometer (also called Abbe refractometer) is designed according to total reflection principle of light, it utilizes the determination method of total reflection critical angle to measure refractive index of unknown substance, can quantitatively analyze some components in solution, it can also be used for measuring sugar concentration of sugar solution, and checking purity of substance, and is one of general equipments indispensable for petroleum industry, oil industry, pharmaceutical industry, lacquer industry, food industry, daily chemical industry, sugar industry and geological investigation, etc.
At present, the handheld refractometer is widely used in the market and factories and mines, and the manual reading error is difficult to avoid by naked eyes through an eyepiece, and only the sampling measurement is performed, so that the efficiency is low and the Abbe number cannot be measured; the digital refractometer used in the laboratory is limited by sampling as the traditional visual method, and cannot meet the requirements of on-site continuous measurement and real-time measurement; the high-precision digital refractometer is influenced by the light path and has larger volume.
Disclosure of Invention
In order to overcome the defects in the background technology, the invention discloses a probe type digital display refractometer, through the invention, the influence of visual reading errors in the prior art is completely overcome, real-time on-line measurement of a certain range of refractive index is realized, the probe can be used for realizing non-sampling measurement in a liquid environment, the size of the probe is greatly reduced through the design of an optical path, and the probe type digital display refractometer is suitable for oil product measurement, sugar measurement and other applications.
The technical scheme for realizing the invention is as follows:
the utility model provides a probe formula digital display refractometer, includes host computer and probe, characterized by: the inside upper strata of host computer is for having the optical signal to send the side, and the inside lower floor of host computer is for the optical signal receiving side, is equipped with the optical fiber interface on a lateral wall of host computer, and optical fiber connector is connected with the optical fiber interface, optical fiber connector and probe between be connected through optic fibre, be equipped with display screen, on-off key, school key and lock key on the upper surface of host computer respectively.
The probe type digital display refractometer is characterized in that the light signal emitting side comprises a signal processing circuit board and a laser light source control circuit board, the signal processing circuit board and the laser light source control circuit board are electrically connected, a conical lens is arranged at the outlet of an upper layer optical fiber interface inside a host, a reflecting mirror A is arranged at the upper right corner of the upper layer inside the host at the tail end of the conical lens, and a laser light source A, a laser light source B and a laser light source C are arranged at the lower right corner of the upper layer inside the host at the opposite sides of the reflecting mirror A.
The included angle between the reflector A and the horizontal direction is 45 degrees.
The probe type digital display refractometer is characterized in that an included angle between the laser light source A and the laser light source B is 4 degrees, and an included angle between the laser light source B and the laser light source C is 4 degrees.
The specifications of the laser diodes in the laser light source A, the laser light source B and the laser light source C are 100mw of ML101J25 Mitsubishi 650nm, 80mw of PL450B Eulerian 450nm and 120mw of PL520A Eulerian 520nm respectively.
The probe type digital display refractometer is characterized in that the optical signal receiving side comprises a battery and a prism A, the prism A is arranged at the outlet of an optical fiber interface at the lower layer inside the host, a fine adjustment groove is formed in one side of the prism A, a reflecting mirror B is arranged at the right lower corner of the lower layer inside the diagonal host of the prism A, a light intensity sensor is arranged at the left lower corner of the lower layer inside the opposite host of the reflecting mirror B, and the light intensity sensor is electrically connected with a signal processing circuit board.
The included angle between the reflecting mirror B and the vertical direction of the probe type digital display refractometer is 29 degrees.
The probe type digital display refractometer comprises an optical fiber A and an optical fiber B, wherein a bare fiber hole A and a bare fiber hole B are formed in a probe 7, a prism B is arranged on one side of the head of the probe, a reflecting mirror C is arranged on the other side of the head of the probe, and a probe shell is arranged outside the probe.
The probe type digital display refractometer is characterized in that the prism B is made of ZF7 glass.
The battery is a detachable rechargeable battery, and is used for supplying power to the signal processing circuit board, the laser light source control circuit board and the light intensity sensor.
The probe type digital display refractometer has the advantages that the probe type digital display refractometer completely overcomes the influence of visual reading errors in the prior art, achieves real-time online measurement of refractive indexes in a certain range, can achieve non-sampling measurement in an interventional environment, greatly reduces the size of the probe through an optical path design, is suitable for oil product measurement, sugar measurement and other applications, and can meet the process control requirements of various industrial control occasions through online measurement of the concentration of liquid.
Drawings
The invention will be further described with reference to the drawings and examples.
FIG. 1 is a schematic diagram of the overall structure of the product of the present invention.
Fig. 2 is a schematic diagram of the internal structure of the light signal emitting side of the present invention.
Fig. 3 is a schematic diagram of the internal structure of the optical signal receiving side of the present invention.
Fig. 4 is a schematic view of the internal structure of the probe of the present invention.
FIG. 5 is a schematic cross-sectional view of a probe of the present invention interfacing with an optical fiber.
Fig. 6 is a schematic circuit structure of the present invention.
In the figure: 1. a host; 2. a display screen; 3. a switching key; 4. calibrating the key; 5. a locking key; 6. an optical fiber interface; 7. a probe; 8. an optical fiber; 9. an optical fiber connector; 10. a signal processing circuit board; 11. a laser light source control circuit board; 12. a laser light source A;13. a laser light source B;14. a laser light source C;15. a reflecting mirror A;16. a battery; 17. a light intensity sensor; 18. a reflecting mirror B;19. a prism A;20. a fine adjustment groove; 21. a probe housing; 22. a prism B;23. a reflecting mirror C;24. bare fiber hole A;25. bare fiber hole B;26. an optical fiber A;27. an optical fiber B;28. a conical lens.
Detailed Description
The invention will now be described in further detail with reference to the accompanying drawings. The drawings are simplified schematic representations which merely illustrate the basic structure of the invention and therefore show only the structures which are relevant to the invention.
The probe type digital display refractometer comprises a host 1 and a probe 7, wherein the inner part of the host 1 is divided into an upper layer and a lower layer, the upper layer in the host 1 is an optical signal emitting side, the lower layer in the host 1 is an optical signal receiving side, the optical signal emitting side comprises a signal processing circuit board 10 and a laser light source control circuit board 11, the signal processing circuit board 10 and the laser light source control circuit board 11 are electrically connected, a conical lens 28 is arranged at the outlet of an optical fiber interface 6 at the upper layer in the host 1, a reflecting mirror A15 is arranged at the upper right corner of the upper layer in the conical lens 28, an included angle between the reflecting mirror A15 and the horizontal direction is 45 degrees, a laser light source A12, a laser light source B13 and a laser light source C14 are arranged at the lower right corner of the upper layer in the reflecting mirror A15 opposite side to the host 1, the included angle between the laser light source A12 and the laser light source B13 is 4 degrees, the included angle between the laser light source B13 and the laser light source C14 is 4 degrees, and the laser light source A12, the laser light source B13 and the laser light source C14 are respectively provided with the 80m 1000 m 520nm, and 120m 1000 m 520 nm; the optical signal receiving side comprises a battery 16 and a prism A19, wherein the battery 16 is a detachable rechargeable battery and is used for supplying power to a signal processing circuit board 10, a laser light source control circuit board 11 and a light intensity sensor 17, the prism A19 is arranged at the outlet of an optical fiber interface 6 at the inner lower layer of the host computer 1, a fine adjustment groove 20 is arranged at one side of the prism A19, a reflecting mirror B18 is arranged at the right lower corner of the inner lower layer of the diagonal host computer 1 of the prism A19, the included angle between the reflecting mirror B18 and the vertical direction is 29 degrees, the light intensity sensor 17 is arranged at the left lower corner of the inner lower layer of the opposite host computer 1 of the reflecting mirror B18, and the light intensity sensor 17 is electrically connected with the signal processing circuit board 10; an optical fiber interface 6 is arranged on one side wall of a host 1, an optical fiber connector 9 is connected with the optical fiber interface 6, the optical fiber connector 9 is connected with a probe 7 through an optical fiber 8, the optical fiber 8 comprises an optical fiber A26 and an optical fiber B27, a bare fiber hole A24 and a bare fiber hole B25 are formed in the probe 7, a probe shell 21 is arranged outside the probe 7, a prism B22 is arranged on one side of the head of the probe 7, the prism B22 is made of ZF7 glass, a reflecting mirror C23 is arranged on the other side of the head of the probe 7, a display screen 2 is respectively arranged on the upper surface of the host 1, the display screen 2 is a 12846 liquid crystal module, a switch key 3 and a calibration key 4 are arranged, the calibration key 4 is used for correcting before measurement, errors are reduced, and the locking key 5 is used for locking screen readings.
Wherein, an included angle of 4 degrees is arranged between the laser light source A12 and the laser light source B13, and an included angle of 4 degrees is arranged between the laser light source B13 and the laser light source C14 in order to combine three laser beams into one beam, and the included angle is set to be 4 degrees according to the specific size and the use requirement of the device; the included angle between the reflecting mirror B18 and the vertical direction is 29, so that the reflected light is reflected to a designated position, and the included angle of 29 degrees is calculated according to the whole size of the refractometer; the signal processing circuit board 10 and the laser light source control circuit board 11 are used for calculation of readings.
The refractive index of a medium is typically determined experimentally and there are a variety of measurement methods. For solid media, a minimum deflection angle method or an auto-collimation method is commonly used, or the solid media is measured by a Michelson interferometer by utilizing the principle of equal-thickness interference; critical angle method (abbe refractometer) is commonly used for liquid medium.
Measurement principle:
snell's law: n is n 1 sinθ i ＝n 2 sinθ t
The reflectance formula is:
the special phenomenon that the transparent substance can be dispersed when refracting white light is that the Abbe number is the inverse proportion index used for representing the dispersion capacity of the transparent substance, and the Abbe number is calculated: the refractive index of the three wavelengths can be calculated from the refractive index-light intensity functions obtained by scaling the three light intensity values. Then the Abbe number v is calculated by the following formula d The invention can measure the Abbe number, and reflects the refractive index condition of the sample to be measured by the Abbe number:
wherein: n is n 450 : refractive index of 450nm wavelength;
n 520 : refractive index at 520nm wavelength;
n 650 : a 650nm wavelength refractive index;
the circuit structure diagram of the invention is shown in fig. 6, the signal processing circuit board 10 adopts a 89C51 type circuit board, the laser light source control circuit board 11 comprises three groups of laser driving circuits and laser diodes, the three groups of laser diodes are respectively an ML101J25 mitsubishi 650nm laser diode, an PL450B osram 450nm laser diode and an PL520A osram 520nm laser diode, wherein the laser driving circuit port 5 of the ML101J25 mitsubishi 650nm laser diode is connected with the port 33 of the signal processing circuit board 10, the laser driving circuit port 5 of the pl450B osram 450nm laser diode is connected with the port 31 of the signal processing circuit board 10, and the laser driving circuit port 5 of the pl520A osram 520nm laser diode is connected with the port 29 of the signal processing circuit board 10; the display screen 2 adopts an LED12846 liquid crystal module, 4 to 17 ports of the display screen 2 are connected with corresponding ports at positions 30 to 40 and 4 to 18 of the signal processing circuit board 10, the specification of the light intensity sensor 17 is a TSL2561 light intensity module which is used for receiving light intensity after passing through liquid to be detected, 3 and 4 ports of three groups of light intensity modules are respectively connected with corresponding ports at positions 1 to 11 of the signal processing circuit board 10, the battery 16 supplies power to the whole instrument, the fine adjustment groove 20 is used for fine adjustment of the angle of the triangular prism, screws are arranged in the fine adjustment groove 20, and the angle of the prism 19 is adjusted by screwing the screws.
When the probe type digital display refractometer is used, after the probe 7 of the probe type digital display refractometer is placed into a liquid to be measured, after the switch key 3 on the main machine of the probe type digital display refractometer is pressed, the signal processing circuit board 10 and the laser light source control circuit board 11 are electrified to start working, the laser light source control circuit board 11 drives the laser light source A12, the laser light source B13 and the laser light source C14 to work, the laser light source A12, the laser light source B13 and the laser light source C14 emit laser light to the reflector A15, the laser light is reflected by the reflector A15 and then emitted to the conical lens 28, the laser light enters the optical fiber A26 through the conical lens 28, is emitted from the other end of the optical fiber A26 after being transmitted through the optical fiber 8, and then enters the bare fiber hole A24 and the prism B22, the laser is emitted from the prism B22 and then is emitted to the liquid to be measured, a part of the laser is reflected by the liquid to be measured, a part of the laser is emitted to the liquid to be measured, the laser reflected by the liquid to be measured is emitted to the reflector C23, the laser is reflected by the reflector C23 and then enters the bare fiber hole B25, then enters the optical fiber B27, the laser is transmitted through the optical fiber 8 and then is emitted from the other end of the optical fiber B27, the laser is refracted by the prism A19 and then emitted to the reflector B18, the laser is emitted to the light intensity sensor 17 after being reflected by the reflector B18, the light intensity sensor 17 transmits data to the signal processing circuit board 10 after detecting the light intensity, the signal processing circuit board 10 calculates and measures the return light intensity, the refractive index of the liquid to be measured is obtained through calculating the intensity value, and finally the measuring result is displayed on the display screen 2.
When the probe type digital display refractometer is used, the probe 7 can be placed into the liquid to be measured, or the probe 7 can be naturally placed after the probe 7 is started, and if the probe 7 is naturally placed in the air, the display does not display the reading.
While the above-described preferred embodiments according to the present invention have been shown and described, various changes and modifications can be made by one skilled in the art without departing from the spirit of the invention. The technical scope of the present invention is not limited to the description, but must be determined according to the scope of claims.
Claims (8)
1. The utility model provides a probe formula digital display refractometer, includes host computer (1) and probe (7), characterized by: the inner part of the host machine (1) is divided into an upper layer and a lower layer, the upper layer in the host machine (1) is provided with an optical signal emitting side, the lower layer in the host machine (1) is provided with an optical signal receiving side, an optical fiber interface (6) is arranged on one side wall of the host machine (1), an optical fiber connector (9) is connected with the optical fiber interface (6), the optical fiber connector (9) is connected with a probe (7) through an optical fiber (8), and a display screen (2), a switch key (3), a calibration key (4) and a locking key (5) are respectively arranged on the upper surface of the host machine (1);
the optical signal receiving side comprises a battery (16) and a prism A (19), wherein the prism A (19) is arranged at the outlet of an optical fiber interface (6) at the lower layer inside the host machine (1), a fine adjustment groove (20) is formed in one side of the prism A (19), a reflecting mirror B (18) is arranged at the right lower corner of the lower layer inside the diagonal host machine (1) of the prism A (19), a light intensity sensor (17) is arranged at the left lower corner of the lower layer inside the diagonal host machine (1) opposite to the reflecting mirror B (18), and the light intensity sensor (17) is electrically connected with a signal processing circuit board (10);
the optical fiber (8) comprises an optical fiber A (26) and an optical fiber B (27), a bare fiber hole A (24) and a bare fiber hole B (25) are arranged in the probe (7), a prism B (22) is arranged on one side of the head of the probe (7), a reflecting mirror C (23) is arranged on the other side of the head of the probe (7), and a probe shell (21) is arranged outside the probe (7).
2. The probe-type digital display refractometer according to claim 1, characterized in that: the optical signal sending side comprises a signal processing circuit board (10) and a laser light source control circuit board (11), the signal processing circuit board (10) and the laser light source control circuit board (11) are electrically connected, a conical lens (28) is arranged at the outlet of an upper layer optical fiber interface (6) in the main machine (1), a reflecting mirror A (15) is arranged at the right upper corner of the upper layer in the main machine (1) at the tail end of the conical lens (28), and a laser light source A (12), a laser light source B (13) and a laser light source C (14) are arranged at the right lower corner of the upper layer in the main machine (1) at the opposite side of the reflecting mirror A (15).
3. The probe-type digital display refractometer according to claim 2, characterized in that: the included angle between the reflecting mirror A (15) and the horizontal direction is 45 degrees.
4. The probe-type digital display refractometer according to claim 2, characterized in that: the included angle between the laser light source A (12) and the laser light source B (13) is 4 degrees, and the included angle between the laser light source B (13) and the laser light source C (14) is 4 degrees.
5. The probe-type digital refractometer according to claim 2 or 4, characterized in that: the specifications of the laser diodes in the laser light source A (12), the laser light source B (13) and the laser light source C (14) are ML101J25 Mitsubishi 650nm100mw, PL450B Oslang 450nm80mw and PL520A Oslang 520nm120mw respectively.
6. The probe-type digital display refractometer according to claim 1, characterized in that: the included angle between the reflecting mirror B (18) and the vertical direction is 29 degrees.
7. The probe-type digital display refractometer according to claim 1, characterized in that: the prism B (22) is made of ZF7 glass.
8. The probe-type digital display refractometer according to claim 1, characterized in that: the battery (16) is a detachable rechargeable battery and supplies power to the signal processing circuit board (10), the laser light source control circuit board (11) and the light intensity sensor (17).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201711169474.9A CN107957407B (en) | 2017-11-22 | 2017-11-22 | Probe type digital display refractometer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711169474.9A CN107957407B (en) | 2017-11-22 | 2017-11-22 | Probe type digital display refractometer |
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| CN107957407A CN107957407A (en) | 2018-04-24 |
| CN107957407B true CN107957407B (en) | 2023-12-26 |
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