CN112014351A - Liquid refractive index measuring device and system - Google Patents
Liquid refractive index measuring device and system Download PDFInfo
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- CN112014351A CN112014351A CN202010903066.7A CN202010903066A CN112014351A CN 112014351 A CN112014351 A CN 112014351A CN 202010903066 A CN202010903066 A CN 202010903066A CN 112014351 A CN112014351 A CN 112014351A
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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
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Abstract
The invention relates to a liquid refractive index measuring device and a system, wherein the measuring device comprises a plurality of measuring units which are arranged periodically; the measuring unit comprises a substrate, a dielectric block and a metal block, wherein the dielectric block and the metal block are arranged on the substrate, the substrate is of a cuboid structure, the dielectric block is of an L-shaped structure, and the metal block is of a cuboid structure; the medium block comprises four outer side faces and two inner side faces, each outer side face is flush with the side face of the substrate corresponding to each outer side face, and the two inner side faces are perpendicular to each other; the metal block is arranged at the junction of the two inner side surfaces; the measuring units are fixedly connected through the substrates in the measuring units. The device utilizes the characteristic that surface plasmons generated on a chiral structure are extremely sensitive to the surrounding environment, and when liquid to be measured with different refractive indexes is poured, the transmission spectrum and the circular dichroism spectrum of the device can generate very sensitive changes, so that the device is high in measurement accuracy.
Description
Technical Field
The invention relates to the technical field of liquid refractive index measurement, in particular to a liquid refractive index measurement device and system.
Background
The measurement of the refractive index of a liquid can indirectly obtain other widely used parameters such as concentration of a solution, biomedical markers, salinity, fermentation kinetics parameters, etc. since it can provide important physical, biological and chemical information. The detection method ensures the reliability and real-time performance of the detection result, and can realize the minimization of sample preparation without fluorescent labeling. In addition, the refractive index can be used as an index to monitor the dynamic change process of the liquid. In many industrial sectors and scientific research, such as chemical industry, medicine, petroleum, etc., it is necessary and important to measure the refractive index of some liquids.
Through long-term research on refractive index, various methods for measuring refractive index have been developed. The refractive index of the liquid can be measured by various methods such as an optical critical angle method, a wave optics method, a refraction angle method, and an optical fiber sensing method. However, the method has generally low measurement accuracy, complex measurement device and high measurement cost.
Disclosure of Invention
The invention aims to provide a liquid refractive index measuring device and a system, which are used for improving the measuring precision and reducing the measuring cost.
In order to achieve the purpose, the invention provides the following scheme:
a liquid refractive index measuring device comprises a plurality of measuring units which are arranged periodically; the measuring unit comprises a substrate, a dielectric block and a metal block, wherein the dielectric block and the metal block are arranged on the substrate, the substrate is of a cuboid structure, the dielectric block is of an L-shaped structure, and the metal block is of a cuboid structure; the medium block comprises four outer side faces and two inner side faces, each outer side face is flush with the side face of the substrate corresponding to each outer side face, and the two inner side faces are perpendicular to each other; the metal block is arranged at the junction of the two inner side surfaces; the measuring units are fixedly connected through the substrates in the measuring units.
Optionally, the thickness of the dielectric block is greater than that of the metal block.
Optionally, the metal block is made of gold, silver or copper.
Optionally, the dielectric block is made of silicon dioxide or aluminum oxide.
Optionally, the substrate is made of glass.
Optionally, the upper surface of the substrate is square.
Optionally, the side length of the square is 800 nm.
Optionally, the length of the metal block is 400nm, and the width of the metal block is 300 nm.
A liquid refractive index measuring system comprises a spectrum measuring device and the measuring device connected with the spectrum measuring device; the spectrum measuring device is used for measuring the transmission spectrum of the measuring device.
Optionally, the light emitted by the spectrum measuring device is circularly polarized light.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention discloses a liquid refractive index measuring device and a system, wherein the measuring device comprises a plurality of measuring units which are arranged periodically; the measuring unit comprises a substrate, a dielectric block and a metal block, wherein the dielectric block and the metal block are arranged on the substrate, the substrate is of a cuboid structure, the dielectric block is of an L-shaped structure, and the metal block is of a cuboid structure; the medium block comprises four outer side faces and two inner side faces, each outer side face is flush with the side face of the substrate corresponding to each outer side face, and the two inner side faces are perpendicular to each other; the metal block is arranged at the junction of the two inner side surfaces; the measuring units are fixedly connected through the substrates in the measuring units. The device utilizes the characteristic that surface plasmons generated on a chiral structure are extremely sensitive to the surrounding environment, and when liquid to be measured with different refractive indexes is poured, the transmission spectrum and the circular dichroism spectrum of the device can generate very sensitive changes, so that the device is high in measurement accuracy.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
Fig. 1 is a structural diagram of a liquid refractive index measurement apparatus provided in embodiment 1 of the present invention;
fig. 2 is a structural diagram of a measurement unit provided in embodiment 1 of the present invention;
FIG. 3 is a transmission spectrum diagram of a measurement device for measuring a change in refractive index of a liquid to be measured according to embodiment 1 of the present invention;
fig. 4 is a circular dichroism chart of the measuring apparatus when the refractive index of the liquid to be measured changes according to embodiment 1 of the present invention.
Description of the symbols: 1-substrate, 2-dielectric block, 3-metal block.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a liquid refractive index measuring device and a system, which are used for improving the measuring precision and reducing the measuring cost.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Example 1
Fig. 1 is a structural diagram of a liquid refractive index measurement apparatus according to an embodiment of the present invention, and as shown in fig. 1, the measurement apparatus includes a plurality of measurement units arranged periodically. The measuring unit comprises a substrate 1, and a dielectric block 2 and a metal block 3 which are arranged on the substrate 1, wherein the substrate 1 is of a cuboid structure, the dielectric block 2 is of an L-shaped structure, and the metal block 3 is of a cuboid structure. The dielectric block 2 includes four outer sides and two inner sides, each outer side is flush with the side of the substrate corresponding to each outer side, and the two inner sides are perpendicular to each other. The metal block 3 is arranged at the junction of the two inner side surfaces. The measuring units are fixedly connected through the substrates in the measuring units. Fig. 2 is a structural diagram of a measurement unit provided in embodiment 1 of the present invention.
Preferably, the material of the substrate 1 is glass. The material of the dielectric block 2 is silicon dioxide or aluminum oxide. The metal block 3 is made of gold, silver or copper.
Preferably, as shown in FIG. 2, the upper surface of the substrate 1 is square, and the sides L1 and L2 of the square are 800 nm. L3 in the dielectric block 2 was 400nm, and L4 was 200 nm. The metal block 3 had a length L5 of 400nm and a width L6 of 300 nm. L7 was 400nm and L8 was 600 nm.
Preferably, the thickness of the dielectric block 2 is greater than the thickness of the metal block 3.
The measurement principle of the device is as follows:
in measurement, a liquid to be measured is placed on the upper surface of the substrate 1 in a region not in contact with the dielectric block 2 and the metal block 3. When the metal block 2 and the dielectric block 3 are irradiated by circularly polarized light, surface plasmon resonance is generated at the junction, and when the refractive index of the liquid to be measured changes, the liquid to be measured is sensitive to the change perception of the surrounding environment, so that the measured resonance peak in the transmission spectral line can change obviously. The liquid refractive index is in one-to-one correspondence with the finally measured transmission spectral lines, so that the refractive index of the liquid to be measured can be measured according to the movement of the transmission spectral lines. And when the liquid to be measured is placed so as not to overflow the metal block 3 (the height of the liquid to be measured is lower than that of the metal block 3) during measurement, the whole measuring device is facilitated to form a stepped chiral structure. And when the placed liquid to be measured is over the metal block 3, the liquid to be measured covers the whole metal block 3. Therefore, for the metal block 3, the change of the surrounding environment is larger, the change of the transmission spectral line measured by the device is more sensitive, and the measured refractive index is higher in precision.
Therefore, the device has higher measurement accuracy, does not need to build a complex light path, and has simple structure and low measurement cost.
The transmission and circular dichroism characteristics of the measuring device are numerically simulated by utilizing three-dimensional finite element simulation software COMSOL Multiphysics, wherein the metal block 3 is made of silver, and the dielectric block 2 is made of silicon dioxide. Fig. 3 is a transmission spectrum diagram of a measuring apparatus when the refractive index of the liquid to be measured changes according to embodiment 1 of the present invention. As shown in fig. 3, when the refractive index of the liquid to be measured changes, the resonance peak in the transmission line of the measuring device changes significantly. Fig. 4 is a circular dichroism curve diagram of a measuring device when the refractive index of a liquid to be measured changes according to embodiment 1 of the present invention, and as shown in fig. 4, when the refractive index of the liquid to be measured changes, the circular dichroism curve of the measuring device also changes obviously.
Because the refractive index of the liquid to be measured corresponds to the resonance peak and the circular dichroism curve in the transmission spectral line one by one, the measurement of the refractive index of the liquid to be measured can be realized by measuring the change of the resonance peak and the circular dichroism curve in the transmission spectral line. Measuring two parameters greatly improves the reliability of the measurement. In addition, the device utilizes the characteristic that the surface plasmon generated on the chiral structure is extremely sensitive to the surrounding environment, when liquid to be measured with different refractive indexes is poured, the transmission spectrum and the circular dichroism spectrum of the device can generate extremely sensitive changes, and therefore the measurement precision is high.
Example 2
This embodiment provides a liquid refractive index measurement system including the measurement device of embodiment 1 and a spectral measurement device connected thereto. The spectrum measuring apparatus was used to measure the transmission spectrum of the measuring apparatus in example 1. Wherein the light emitted by the spectrum measuring device is circularly polarized light.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
(1) the device utilizes the difference of the transmission spectrum and the circular dichroism spectrum of the device caused by the liquid to be measured with different refractive indexes to measure the refractive index of the liquid to be measured, and the measurement precision is high.
(2) The device does not need to build a complex light path, and has simple structure and low measurement cost.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For the system disclosed by the embodiment, the description is relatively simple because the system corresponds to the method disclosed by the embodiment, and the relevant points can be referred to the method part for description.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to assist in understanding the core concepts of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (10)
1. A liquid refractive index measuring device is characterized by comprising a plurality of measuring units which are periodically arranged; the measuring unit comprises a substrate, a dielectric block and a metal block, wherein the dielectric block and the metal block are arranged on the substrate, the substrate is of a cuboid structure, the dielectric block is of an L-shaped structure, and the metal block is of a cuboid structure; the medium block comprises four outer side faces and two inner side faces, each outer side face is flush with the side face of the substrate corresponding to each outer side face, and the two inner side faces are perpendicular to each other; the metal block is arranged at the junction of the two inner side surfaces; the measuring units are fixedly connected through the substrates in the measuring units.
2. The measurement device of claim 1, wherein a thickness of the dielectric block is greater than a thickness of the metal block.
3. A measuring device according to claim 1, characterized in that the material of the metal block is gold, silver or copper.
4. The measuring device of claim 1, wherein the material of the dielectric block is silicon dioxide or aluminum oxide.
5. A measuring device according to claim 1, characterized in that the material of the substrate is glass.
6. The measurement device of claim 1, wherein the upper surface of the substrate is square.
7. A measuring device according to claim 6, characterized in that the sides of the square are 800 nm.
8. The measuring device of claim 6, wherein the metal block has a length of 400nm and a width of 300 nm.
9. A liquid refractive index measurement system comprising a spectroscopic measurement device and the measurement device of any one of claims 1 to 9 connected to the spectroscopic measurement device; the spectral measuring apparatus is used for measuring the transmission spectrum of the measuring apparatus according to any one of claims 1 to 9.
10. The measurement system of claim 9, wherein the light emitted by the spectral measurement device is circularly polarized light.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010903066.7A CN112014351A (en) | 2020-09-01 | 2020-09-01 | Liquid refractive index measuring device and system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010903066.7A CN112014351A (en) | 2020-09-01 | 2020-09-01 | Liquid refractive index measuring device and system |
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| CN112014351A true CN112014351A (en) | 2020-12-01 |
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| CN202010903066.7A Withdrawn CN112014351A (en) | 2020-09-01 | 2020-09-01 | Liquid refractive index measuring device and system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114252952A (en) * | 2022-02-11 | 2022-03-29 | 西安邮电大学 | Double-layer chiral micro-nano structure and preparation method thereof |
| CN114815020A (en) * | 2022-04-21 | 2022-07-29 | 岭南师范学院 | Design method of high-quality-factor refractive index sensor and refractive index sensor |
-
2020
- 2020-09-01 CN CN202010903066.7A patent/CN112014351A/en not_active Withdrawn
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114252952A (en) * | 2022-02-11 | 2022-03-29 | 西安邮电大学 | Double-layer chiral micro-nano structure and preparation method thereof |
| CN114252952B (en) * | 2022-02-11 | 2023-10-24 | 西安邮电大学 | Double-layer chiral micro-nano structure and preparation method thereof |
| CN114815020A (en) * | 2022-04-21 | 2022-07-29 | 岭南师范学院 | Design method of high-quality-factor refractive index sensor and refractive index sensor |
| CN114815020B (en) * | 2022-04-21 | 2023-09-22 | 岭南师范学院 | Design method of high-quality-factor refractive index sensor and refractive index sensor |
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