CN112129717A - Visual solution detection device - Google Patents
Visual solution detection device Download PDFInfo
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- CN112129717A CN112129717A CN201910551889.5A CN201910551889A CN112129717A CN 112129717 A CN112129717 A CN 112129717A CN 201910551889 A CN201910551889 A CN 201910551889A CN 112129717 A CN112129717 A CN 112129717A
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- solution
- photonic crystal
- concentration
- detected
- calcium titanate
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- 238000001514 detection method Methods 0.000 title claims abstract description 16
- 230000000007 visual effect Effects 0.000 title claims abstract description 11
- 239000004038 photonic crystal Substances 0.000 claims abstract description 51
- HAUBPZADNMBYMB-UHFFFAOYSA-N calcium copper Chemical compound [Ca].[Cu] HAUBPZADNMBYMB-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000000463 material Substances 0.000 claims abstract description 11
- 230000008859 change Effects 0.000 claims abstract description 10
- 238000002835 absorbance Methods 0.000 claims abstract description 8
- 238000000411 transmission spectrum Methods 0.000 claims abstract description 7
- 230000000694 effects Effects 0.000 claims abstract description 6
- 239000013078 crystal Substances 0.000 claims description 2
- 230000005540 biological transmission Effects 0.000 abstract description 9
- 239000003814 drug Substances 0.000 abstract description 2
- 229910001385 heavy metal Inorganic materials 0.000 abstract description 2
- 239000000447 pesticide residue Substances 0.000 abstract description 2
- 229940079593 drug Drugs 0.000 abstract 1
- 239000000243 solution Substances 0.000 description 40
- 238000000034 method Methods 0.000 description 9
- 230000003287 optical effect Effects 0.000 description 4
- 238000005259 measurement Methods 0.000 description 3
- 230000000737 periodic effect Effects 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000002798 spectrophotometry method Methods 0.000 description 2
- 238000004448 titration Methods 0.000 description 2
- 238000012800 visualization Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000004847 absorption spectroscopy Methods 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 230000003760 hair shine Effects 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 238000004451 qualitative analysis Methods 0.000 description 1
- 238000004445 quantitative analysis Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000012031 short term test Methods 0.000 description 1
- 239000012086 standard solution Substances 0.000 description 1
- 239000012085 test solution Substances 0.000 description 1
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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
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/29—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands using visual detection
-
- 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
- G01N21/59—Transmissivity
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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)
- Spectroscopy & Molecular Physics (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
A visual solution detection device is composed of a light source 1, a solution to be detected 2 and a photonic crystal 3. The detection device is characterized in that light emitted by a light source 1 irradiates a solution to be detected 2, the solution to be detected irradiates a photonic crystal 3 after absorbing certain light intensity according to the concentration of the solution, the photonic crystal 3 is a two-dimensional photonic crystal constructed by a copper calcium titanate ferroelectric material, the copper calcium titanate has an electro-optic effect, the copper calcium titanate has different relative dielectric constants when irradiated by different light intensities, the change of the relative dielectric constant can also cause the change of the wavelength of a transmission spectrum of the photonic crystal under the condition of a certain structure, and the lattice constant of the photonic crystal is adjusted to enable a transmission peak to be positioned in a visible light range, so that the concentration of the solution to be detected is determined by visually observing the wavelength (color) of the transmission peak. As long as the absorbance of the solution to be detected and the concentration of the solution are in a linear relation, the device can be used for detecting the concentration of the solution, and can be widely applied to the aspects of food, medicines, pesticide residues, heavy metal residues and the like.
Description
Technical Field
This device utilizes the electro-optic effect of copper calcium titanate to establish the adjustable two-dimensional photonic crystal through plus light intensity regulation, and the absorbance is different when the solution concentration that awaits measuring is different, shines the light intensity on the photonic crystal also different, and different light intensities can arouse the change of photonic crystal transmission spectrum, observes the concentration that can the short-term test solution through the naked eye, belongs to detection area.
Background
At present, the concentration of a solution is usually detected by a titration method, a spectrophotometry (absorption spectroscopy), a densitometer method, an optical rotation method, or the like. The titration method is to drop a standard solution with known accurate concentration into the solution of the substance to be measured, to make the solution produce chemical reaction, and finally to calculate the content of the component to be measured according to the concentration and volume of the reagent. Spectrophotometry is a method of qualitative and quantitative analysis of substances by measuring the relationship between solution concentration and absorbance at specific wavelengths. The specific gravity method measures the specific gravity of the solution and then finds the solution concentration by looking up the table. The optical rotation method measures the concentration of a solution by measuring the angle by which the vibration direction of plane-polarized light rotates when it passes through a chiral substance. The methods have the defects of complicated measurement process, long measurement time, incapability of visualization and the like, and a new detection mechanism is urgently needed in order to meet the requirements of quick and low-cost detection in the information era.
Disclosure of Invention
The invention aims to solve the defects of the detection method, and the rapid visual detection of the solution concentration is realized by utilizing the electro-optic effect of the copper calcium titanate and a smart structure. The device has the advantages of novel principle, simple structure, quick detection, low cost, reusability, visualization and the like.
The invention is realized by the following technical scheme:
as shown in fig. 1, a visual solution detection device is composed of a light source 1, a solution to be detected 2 and a photonic crystal 3. The light emitted by the light source 1 directly irradiates the solution to be measured 2, the higher the concentration of the solution to be measured is, the larger the absorption is, the weaker the light is, the solution to be measured irradiates the photonic crystal 3 after absorbing a certain light intensity, the photonic crystal 3 is a two-dimensional photonic crystal constructed by a copper calcium titanate ferroelectric material, and because the copper calcium titanate has an electro-optic effect, the copper calcium titanate has different relative dielectric constants when irradiated by different light intensities. Under the condition of a certain structure, the change of the relative dielectric constant of the material of the photonic crystal can also cause the change of the wavelength of the transmission spectrum, so that the concentration of the solution to be detected is determined by observing the wavelength (color) of the transmission spectrum by naked eyes. The detection device can be used for measurement as long as the absorbance of the solution to be detected and the concentration of the solution are in a linear relation.
The invention has the beneficial effects that: the device simple structure, detect fast, low cost, repeatedly usable to can directly visual detection through the naked eye, all can the wide application in the aspect of food, medicine, pesticide residue, heavy metal residue etc..
Drawings
Fig. 1 is a schematic structural section view of a visual solution detection device of the invention.
Detailed Description
As shown in fig. 1, a visual solution detection device is composed of a light source 1, a solution to be detected 2 and a photonic crystal 3. In order to facilitate visual observation of naked eyes, the light source 1 is a beam of parallel visible light, certain light intensity irradiates the solution to be detected 2, in order to ensure that the absorbance at each position is the same, the light propagation paths in the solution are required to be the same, namely the thickness of the container is required to be the same, so that the solution to be detected is placed in a solution tank in a specially-made cuboid shape as shown in figure 1, and the length, the width and the height of the solution tank have no specific requirements. The solution to be measured absorbs certain light intensity according to the concentration of the solution and then irradiates the photonic crystal 3, the photonic crystal 3 is a two-dimensional photonic crystal formed by a copper calcium titanate ferroelectric material, in order to realize visual observation, the lattice constant (distance between two adjacent units) of the photonic crystal is adjusted, so that the transmission spectrum is in the visible light range, the lattice constant a is 0.2um, the cylinder is copper calcium titanate with the radius r of 0.3a, the height of the cylinder is the same as that of the solution tank, the other units are air, the photonic crystal is regularly arranged and packaged together according to the structure shown in figure 1, because the copper calcium titanate has different relative dielectric constants when the light irradiation of different intensities is carried out, when the structure of the photonic crystal is not changed and the relative dielectric constants are changed along with the change of the light intensity, the wavelength of the transmission peak of the photonic crystal also changes along with the light intensity, because the light intensity incident on the photonic crystal changes along with the change of the concentration of the solution to be, the final transmission peak wavelength will vary with the concentration of the solution, so that the concentration of the solution can be measured qualitatively or quantitatively by observing the wavelength (color) of the transmission peak. The device can measure the concentration of the solution as long as there is a linear relationship between the solution absorbance and the solution concentration.
Theoretical basis
Photonic crystals, also commonly referred to as photonic band gap materials, are periodic structures of spatially ordered arrangement of materials of different dielectric constants and sizes. A photonic crystal in which the dielectric constant varies periodically in only one direction is called a one-dimensional photonic crystal. A two-dimensional photonic crystal is said to be if the dielectric constant varies periodically in two directions. When light propagates in a periodic structure having almost the same wavelength as the light, electromagnetic waves of certain frequency bands cannot propagate in the structure due to scattering and diffraction by the periodic structure, and thus a frequency band gap of the light is generated. In addition, in the structure, regardless of transverse vibration or longitudinal vibration, the intensity of the electromagnetic wave in a specific frequency band is exponentially attenuated due to scattering and diffraction, and further cannot be propagated in the structure, so that a photon forbidden band is formed. When the frequency of light falls within the photon forbidden band, the photons are forbidden to propagate in the medium, which is the most important feature of photonic crystals. The concept of bandgap tunable photonic crystals was subsequently proposed and is therefore called bandgap tunable photonic crystals because the position and width of the photonic bandgap can be adjusted by using the external environment. Compared with the general photonic crystal, the photonic crystal with the adjustable band gap has wider application field and better performance, and gradually becomes a new hotspot and direction in the research field of the photonic crystal. According to the theory of the photonic crystal, the position and the width of the photonic band gap are determined by the dielectric constant of the material and the lattice parameter of the photonic crystal, and the photonic crystal with the adjustable band gap can be realized by changing any one of the parameters determining the position and the width of the forbidden band of the photonic crystal through the external actions of an electric field, a magnetic field, pressure or changing temperature and the like. Thus, changing the dielectric constant of a material or changing the structural parameters of a crystal are two methods to achieve a bandgap tunable photonic crystal. According to the difference of the sensitivity of photonic crystals made of different materials to the external environment, the band gap adjustable photonic crystals are divided into magnetic field modulation, electric field modulation, illumination modulation, temperature modulation, pressure modulation and the like.
The band gap of the two-dimensional photonic crystal constructed by the calcium copper titanate is adjustable by the external light intensity, because the calcium copper titanate has the electro-optic effect, the relative dielectric constant and the external light intensity satisfy the following relation
Wherein0The term "relative permittivity" refers to the relative permittivity when the applied optical field is 0, "(I) refers to the relative permittivity when the applied optical field is I, and α refers to a constant. Formula (1) shows that the relative dielectric constant of copper calcium titanate changes with the change of light intensity, according to the theory of photonic crystal, the structure of photonic crystal is not changed, but the relative dielectric constant of material is changed, namely the position of photonic band gap is changed, namely the wavelength of transmission peak changes with the change of external light intensity, if the linear relation exists between the absorbance and the concentration of solution, the transmission light intensity will be different after certain light intensity is absorbed by the solution with different concentrations, when the two-dimensional photonic crystal is irradiated, the wavelength (color) of transmission peak of the photonic crystal will establish a specific relation with the concentration of the solution, thereby measuring the concentration of the solution by measuring the wavelength (color) of the transmission peak of the photonic crystal.
The invention has been disclosed above, but it is not intended to limit the invention, and all other devices for visually inspecting solution obtained by using the same idea and method are within the scope of the invention.
Claims (1)
1. A visual solution detection device is composed of a light source 1, a solution to be detected 2 and a photonic crystal 3. The light emitted by the light source 1 directly irradiates the solution to be measured 2, the solution to be measured absorbs corresponding light intensity according to the concentration of the solution and then irradiates the photonic crystal 3, the photonic crystal 3 is a two-dimensional photonic crystal formed by a copper calcium titanate ferroelectric material, the copper calcium titanate has an electro-optic effect, and when the copper calcium titanate is irradiated by different light intensities, the copper calcium titanate has different relative dielectric constants. Under the condition that the crystal structure of the photonic crystal is not changed, the wavelength of the transmission spectrum can be changed due to the change of the relative dielectric constant, so that various indexes in the solution can be measured by visually observing the wavelength (color) of the transmission spectrum by naked eyes. The device can be used for detecting the concentration of the solution as long as the absorbance of the solution to be detected and the concentration of the solution are in a linear relation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910551889.5A CN112129717A (en) | 2019-06-24 | 2019-06-24 | Visual solution detection device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910551889.5A CN112129717A (en) | 2019-06-24 | 2019-06-24 | Visual solution detection device |
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| Publication Number | Publication Date |
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| CN112129717A true CN112129717A (en) | 2020-12-25 |
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| CN201910551889.5A Pending CN112129717A (en) | 2019-06-24 | 2019-06-24 | Visual solution detection device |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202956340U (en) * | 2012-12-02 | 2013-05-29 | 上海理工大学 | Solution concentration detector based on photonic crystal negative refraction effect |
| CN108535197A (en) * | 2018-04-24 | 2018-09-14 | 南京信息工程大学 | A kind of detection device and method of miniature ethanol solution concentration |
-
2019
- 2019-06-24 CN CN201910551889.5A patent/CN112129717A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202956340U (en) * | 2012-12-02 | 2013-05-29 | 上海理工大学 | Solution concentration detector based on photonic crystal negative refraction effect |
| CN108535197A (en) * | 2018-04-24 | 2018-09-14 | 南京信息工程大学 | A kind of detection device and method of miniature ethanol solution concentration |
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Application publication date: 20201225 |