CN109975223B - System and method for realizing variable-light-range water quality monitoring - Google Patents
System and method for realizing variable-light-range water quality monitoring Download PDFInfo
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- CN109975223B CN109975223B CN201910306345.2A CN201910306345A CN109975223B CN 109975223 B CN109975223 B CN 109975223B CN 201910306345 A CN201910306345 A CN 201910306345A CN 109975223 B CN109975223 B CN 109975223B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 56
- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000012544 monitoring process Methods 0.000 title claims abstract description 20
- 230000003287 optical effect Effects 0.000 claims abstract description 64
- 238000002310 reflectometry Methods 0.000 claims description 152
- 239000010408 film Substances 0.000 claims description 28
- 230000031700 light absorption Effects 0.000 claims description 22
- 238000000576 coating method Methods 0.000 claims description 12
- 239000011248 coating agent Substances 0.000 claims description 11
- 230000003247 decreasing effect Effects 0.000 claims description 11
- 238000010521 absorption reaction Methods 0.000 claims description 8
- 238000010183 spectrum analysis Methods 0.000 claims description 6
- 238000012360 testing method Methods 0.000 claims description 4
- 238000004458 analytical method Methods 0.000 claims description 3
- 239000010409 thin film Substances 0.000 claims description 3
- 238000005259 measurement Methods 0.000 abstract description 13
- 230000000694 effects Effects 0.000 abstract description 6
- 238000001514 detection method Methods 0.000 abstract description 2
- 238000001228 spectrum Methods 0.000 description 17
- 238000004364 calculation method Methods 0.000 description 13
- 239000013307 optical fiber Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000010561 standard procedure Methods 0.000 description 3
- 239000004020 conductor Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000007888 film coating Substances 0.000 description 1
- 238000009501 film coating Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
- 229910052724 xenon Inorganic materials 0.000 description 1
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 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
- G01N21/01—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
- G01N21/17—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
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
-
- 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
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/33—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using ultraviolet light
-
- 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
- G01N2021/0112—Apparatus in one mechanical, optical or electronic block
Abstract
The application belongs to the field of water quality detection, and particularly relates to a system and a method for realizing variable-range water quality monitoring. This application can improve measurement accuracy through the mutual check-up of optical path of difference to same kind of water sample to optical path adjustable effect has been realized under the prerequisite of one set of equipment. Different equivalent optical paths are realized by adjusting the size of the diaphragm, and effective measurement of a water sample with a large pollution degree range can be realized. The light path does not need to be adjusted manually, only one light path is needed, and the device has the advantages of simplicity in adjustment, low cost and the like. The electric diaphragm is used in the light path, the adjusting precision is high, the adjusting speed is high, and continuous adjustment can be realized.
Description
Technical Field
The application belongs to the field of water quality detection, and particularly relates to a system and a method for realizing variable-range water quality monitoring.
Background
When water quality is analyzed by optical methods such as an ultraviolet method and a spectrum method, the light absorption of the seriously-polluted water is strong, and a short optical path is generally needed to obtain a strong enough optical signal; for lightly contaminated water, a long optical path is required to obtain sufficient light absorption. The fixed optical path cannot completely meet the requirement of water quality monitoring.
The traditional processing method adopts a mechanical moving light path, can realize multi-light path measurement, but needs to manually adjust a mechanical device according to the condition of a water sample to be measured to realize different light paths, and cannot realize automatic dynamic adjustment of the light paths; the other solution is to adopt a multi-light path arrangement with different light paths, but has the disadvantages of complex structure and high cost.
The technical scheme of the invention is as follows as the patent with the existing patent application number of 201611197723.0 and the application date of 2016.12.22 which is named as a measuring unit and a measuring system for water quality monitoring: the invention provides a measuring unit and a measuring system for water quality monitoring. The measurement unit includes: the base and the cover plate are made of heat conducting materials and are mutually connected and jointly enclose a supporting cavity; the light-transmitting cuvette is used for accommodating a sample to be measured, is arranged in the supporting cavity and is attached to at least one surface of the supporting cavity; and at least two groups of optical path measuring components which are arranged close to the light-transmitting cuvette and provide different measuring optical paths for the sample to be measured.
The above patent adopts the mode of parallel light path to realize two light paths, does not solve the above-mentioned problem among the prior art, has the problem with high costs, structure complicacy.
Disclosure of Invention
In order to overcome the above problems in the prior art, a system and a method for realizing variable-range water quality monitoring are particularly provided.
In order to achieve the technical effects, the technical scheme of the application is as follows:
the utility model provides a realize variable light path water quality monitoring system which characterized in that: the device at least comprises two variable reflectivity mirrors, a water sample to be detected is arranged between the two variable reflectivity mirrors, one side of each variable reflectivity mirror is provided with an iris diaphragm, and the other side of each variable reflectivity mirror is provided with a light source. The light source can be selected from various existing light sources, such as 254nm ultraviolet LED or wide spectrum light source.
The light source is positioned at one side outside the two variable reflectivity mirrors, and a collimating lens is arranged between the light source and the adjacent variable reflectivity mirror and is used for collimating the light incident to the variable reflectivity mirror into parallel light; the other side of the two variable reflectivity mirrors is provided with a focusing lens and a light intensity or/and spectrum analysis part, and the focusing lens is positioned between the variable diaphragm and the optical analysis part on the side. The light intensity analyzing section mentioned here may be a detector, and the spectrum analyzing section may be an existing structure such as a spectrum analyzer with an optical fiber input in the prior art.
Furthermore, the variable-reflectivity mirror is plated with a thin film with reflectivity changing along with the position, and the reflectivity of adjacent positions is increased or decreased in sequence.
Furthermore, the reflectivity of the adjacent positions of the variable reflectivity mirrors is increased or decreased continuously or in a step-shaped manner.
Furthermore, a circular film is positioned at the center of the variable reflectivity mirror, and the other films are sequentially sleeved outside the circular film in an annular structure. The circular film can be set to a reflectivity near zero or other values of reflectivity.
The process of realizing the optical path-variable full-spectrum water quality monitoring method comprises the following steps:
A. turning on a light source, reducing an iris diaphragm to only allow light to pass through a middle window part of the variable reflectivity mirror, and measuring the light absorption of a water sample; the reflectivity of the middle window part of the variable-reflectivity mirror can be the lowest part of different reflectivities on the variable-reflectivity mirror, and can also be the highest part of the different reflectivities on the variable-reflectivity mirror.
B. Adjusting the iris diaphragm to enable light corresponding to the second reflectivity window to pass through, measuring light absorption of the water sample, wherein the light absorption comprises a middle reflectivity part and a second reflectivity part, and reversely solving the light absorption when only the second reflectivity part exists through the first group of test data; the second reflectivity window refers to the adjacent circle of reflectivity film part outside the middle window of the variable reflectivity mirror, wherein the reflectivity of the second reflectivity window can be higher than that of the middle window part or lower than that of the middle window part. The above-mentioned specific method of inverse solution belongs to the prior art, and is not described herein again.
C. And calculating the water sample absorption coefficient by combining the equivalent optical paths corresponding to different reflectivities and the corresponding light absorption.
The equivalent optical path mentioned here is calculated by adopting a Fabry-Perot cavity (F-P); the absorption coefficient calculation mainly refers to calculation according to experimentally obtained data by using beer-Lambert law, and the specific calculation mode is the prior art, and the calculation is well known to those skilled in the art.
The size of the diaphragm can be dynamically adjusted according to the condition of an actual water sample so as to meet the requirement of measurement.
Before the step A, a variable reflectivity mirror needs to be selected, and the step of selecting the variable reflectivity mirror is that
a. Selecting an equivalent optical path range to be realized;
b. calculating the reflectivity of the window required for coating according to the size of the equivalent optical path required to be realized;
c. designing a film system according to the requirement of reflectivity; the pattern is designed with standard methods, and it is sufficient here to follow the general industry methods and standards.
d. And (5) optical coating.
The application has the advantages that:
1. this application can improve measurement accuracy through the mutual check-up of optical path of difference to same kind of water sample to optical path adjustable effect has been realized under the prerequisite of one set of equipment.
2. This application realizes different equivalent optical paths through adjustment diaphragm size, can realize the effective measurement to the very big water sample of pollution degree scope.
3. The method does not need to manually adjust the light path, only needs one light path, and has the advantages of simple adjustment, low cost and the like. The diaphragm is used for adjusting in the light path, the diaphragm can be selected as an electric diaphragm, the adjusting precision is high, the adjusting speed is high, and continuous adjustment can be realized.
Drawings
FIG. 1 is a schematic diagram of the optical path of the present application.
Fig. 2-5 are schematic diagrams of reflectivity variations. Where R is the radius of the variable reflectivity mirror and R is the reflectivity.
Detailed Description
Example 1
A water quality monitoring system capable of realizing variable light range at least comprises two variable reflectivity mirrors, a water sample to be detected is arranged between the two variable reflectivity mirrors, one side outside the two variable reflectivity mirrors is provided with an iris diaphragm, and the other side outside the two variable reflectivity mirrors is provided with a light source. For automatic control, an electrically operated iris may be selected. The light source can be selected from various existing light sources, such as 254nm ultraviolet LED or wide spectrum light source.
The light source is positioned at one side outside the two variable reflectivity mirrors, and a collimating lens is arranged between the light source and the adjacent variable reflectivity mirror and is used for collimating the light incident to the variable reflectivity mirror into parallel light; the other side of the two variable reflectivity mirrors is provided with a focusing lens and a light intensity or/and spectrum analysis part, and the focusing lens is positioned between the variable diaphragm and the optical analysis part on the side. The light intensity analyzing section mentioned here may be a detector, and the spectrum analyzing section may be an existing structure such as a spectrum analyzer with an optical fiber input in the prior art.
The variable-reflectivity mirror is plated with a thin film with reflectivity changing along with the position, and the reflectivity of adjacent positions is increased or decreased in sequence.
The reflectivity of the adjacent positions of the variable reflectivity mirrors is increased and decreased continuously or increased and decreased in a step mode.
The center of the variable reflectivity mirror is a circular film, and the other films are sequentially sleeved outside the circular film in an annular structure. The circular film can be set to a reflectivity near zero or other values of reflectivity.
Example 2
The process of realizing the optical path-variable full-spectrum water quality monitoring method comprises the following steps:
A. turning on a light source, reducing an iris diaphragm to only allow light to pass through a middle window part of the variable reflectivity mirror, and measuring the light absorption of a water sample; the reflectivity of the middle window part of the variable-reflectivity mirror can be the lowest part of different reflectivities on the variable-reflectivity mirror, and can also be the highest part of the different reflectivities on the variable-reflectivity mirror.
B. Adjusting the iris diaphragm to enable light corresponding to the second reflectivity window to pass through, measuring light absorption of the water sample, wherein the light absorption comprises a middle reflectivity part and a second reflectivity part, and reversely solving the light absorption when only the second reflectivity part exists (corresponding to a long effective optical path) through the first group of test data; the second reflectivity window refers to the adjacent circle of reflectivity film part outside the middle window of the variable reflectivity mirror, wherein the reflectivity of the second reflectivity window can be higher than that of the middle window part or lower than that of the middle window part. The above-mentioned specific method of inverse solution belongs to the prior art, and is not described herein again.
C. And calculating the water sample absorption coefficient by combining the equivalent optical paths corresponding to different reflectivities and the corresponding light absorption.
The equivalent optical path mentioned here is calculated by adopting a Fabry-Perot cavity (F-P); the absorption coefficient calculation mainly refers to calculation according to experimentally obtained data by using beer-Lambert law, and the specific calculation mode is the prior art, and the calculation is well known to those skilled in the art.
The size of the diaphragm can be dynamically adjusted according to the condition of an actual water sample so as to meet the requirement of measurement.
Before the step A, a variable reflectivity mirror needs to be selected, and the step of selecting the variable reflectivity mirror is that
a. Selecting an optical path range to be realized;
b. calculating the reflectivity of the window required for coating according to the size of the equivalent optical path required to be realized;
c. designing a film system according to the requirement of reflectivity; the pattern is designed with standard methods, and it is sufficient here to follow the general industry methods and standards.
d. And (5) optical coating.
This application can improve measurement accuracy through the mutual check-up of optical path of difference to same kind of water sample to optical path adjustable effect has been realized under the prerequisite of one set of equipment. This application realizes different equivalent optical paths through adjustment diaphragm size, can realize the effective measurement to the very big water sample of pollution degree scope. The method does not need to manually adjust the light path, only needs one light path, and has the advantages of simple adjustment, low cost and the like. The diaphragm is used for adjusting in the light path, the diaphragm can be selected as an electric diaphragm, the adjusting precision is high, the adjusting speed is high, and continuous adjustment can be realized.
Example 3
The utility model provides a realize variable light path water quality monitoring system includes two variable reflectivity mirrors at least, is the water sample that awaits measuring between two variable reflectivity mirrors, and at least one side outside two variable reflectivity mirrors is provided with an iris diaphragm, and the opposite side outside two variable reflectivity mirrors is provided with the light source. For convenience, a mechanical iris or an electric iris may be selected. The light source can be selected from various existing light sources, such as 254nm ultraviolet LED or wide spectrum light source.
The light source is positioned at one side outside the two variable reflectivity mirrors, and a collimating lens is arranged between the light source and the adjacent variable reflectivity mirror and is used for collimating the light incident to the variable reflectivity mirror into parallel light; the other side of the two variable reflectivity mirrors is provided with a focusing lens and a light intensity or/and spectrum analysis part, and the focusing lens is positioned between the variable diaphragm and the spectrum analysis part on the side. The light intensity analyzing section mentioned here may be a detector, and the spectrum analyzing section may be an existing structure such as a spectrum analyzer with an optical fiber input in the prior art.
The reflectivity of the film with the reflectivity changing along with the position is increased or decreased in sequence.
The reflectivity of the adjacent positions of the variable reflectivity mirrors is increased and decreased continuously or increased and decreased in a step mode.
The center of the variable reflectivity mirror is a circular film, and the other films are sequentially sleeved outside the circular film in an annular structure. The circular film can be set to a reflectivity near zero or other values of reflectivity.
The process of realizing the optical path-variable full-spectrum water quality monitoring method comprises the following steps:
A. turning on a light source, reducing an iris diaphragm to only allow light to pass through a middle window part of the variable reflectivity mirror, and measuring the light absorption of a water sample; the reflectivity of the middle window part of the variable-reflectivity mirror can be the lowest part of different reflectivities on the variable-reflectivity mirror, and can also be the highest part of the different reflectivities on the variable-reflectivity mirror.
B. Adjusting the iris diaphragm to enable light corresponding to the second reflectivity window to pass through, measuring light absorption of the water sample, wherein the light absorption comprises a middle reflectivity part and a second reflectivity part, and reversely solving the light absorption when only the second reflectivity part exists (corresponding to a long effective optical path) through the first group of test data; the second reflectivity window refers to the adjacent circle of reflectivity film part outside the middle window of the variable reflectivity mirror, wherein the reflectivity of the second reflectivity window can be higher than that of the middle window part or lower than that of the middle window part. The above-mentioned specific method of inverse solution belongs to the prior art, and is not described herein again.
C. And calculating the water sample absorption coefficient by combining the equivalent optical paths corresponding to different reflectivities and the corresponding light absorption.
The equivalent optical path mentioned here is calculated by adopting a Fabry-Perot cavity (F-P); the absorption coefficient calculation mainly refers to calculation according to experimentally obtained data by using beer-Lambert law, and the specific calculation mode is the prior art, and the calculation is well known to those skilled in the art.
The size of the diaphragm can be dynamically adjusted according to the condition of an actual water sample so as to meet the requirement of measurement.
Before the step A, a variable reflectivity mirror needs to be selected, and the step of selecting the variable reflectivity mirror is that
a. Selecting an optical path range to be realized;
b. calculating the reflectivity of the window required for coating according to the size of the equivalent optical path required to be realized;
c. designing a film system according to the requirement of reflectivity; the pattern is designed with standard methods, and it is sufficient here to follow the general industry methods and standards.
d. And (5) optical coating.
This application can improve measurement accuracy through the mutual check-up of optical path of difference to same kind of water sample to optical path adjustable effect has been realized under the prerequisite of one set of equipment. This application realizes different equivalent optical paths through adjustment diaphragm size, can realize the effective measurement to the very big water sample of pollution degree scope. The method does not need to manually adjust the light path, only needs one light path, and has the advantages of simple adjustment, low cost and the like. The diaphragm is used for adjusting in the light path, the diaphragm can be selected as an electric diaphragm, the adjusting precision is high, the adjusting speed is high, and continuous adjustment can be realized.
The wide-spectrum light (mainly ultraviolet-visible light) output by the light source is collimated by the collimating lens and then converted into parallel light, the parallel light is converted into parallel light with uneven light intensity distribution along the axial direction after passing through the variable reflectivity mirror, and the parallel light passes through a water sample to be detected and then is incident on the variable diaphragm through the variable reflectivity mirror. The light enters the spectrum analyzer after passing through the iris diaphragm and then being focused by the focusing lens.
In this embodiment, in a specific implementation, the light source may be a wide spectrum output by an optical fiber, specifically, a xenon lamp light source output by an optical fiber, the collimating lens and the focusing lens are all lenses coated with a broadband antireflection film, the variable reflectance mirror is a window coated with a gradually changing reflectance, the iris is an electric diaphragm, and the spectral analysis portion is a spectrum analyzer with an optical fiber input.
The optical window is coated with a film with reflectivity changing with position, the reflectivity change can be continuous, or the reflectivity changing in different steps can be selected according to requirements, as shown in the following figures, which are several typical arrangements. FIG. 2 is a schematic diagram showing the film surface after coating, in which the reflectivity continuously increases from the middle to the edge; fig. 3 is a graph showing the step increase of the reflectivity from the middle to the edge, and the inset is a schematic diagram of the film surface after coating. Fig. 4 and 5 show the coating methods of high middle reflectivity and low edge reflectivity in continuous and step changes, respectively. The following description of the operation principle uses the method of fig. 2 and 3, i.e. the case of low reflectivity in the middle and the case of high reflectivity in the middle, and the operation principle is similar.
As shown in fig. 1, light of the light source passes through the window and the sample to be measured after being collimated, when the two windows are approximately parallel, a fabry-perot (F-P) -like cavity can be formed, and the transmittance of light with different wavelengths is influenced by the reflectance of the windows in addition to the absorption of the sample, that is, the output of light is equivalent to the result of multi-beam interference at the second window. When the reflectance is zero, light passes through the water sample only once. As the reflectivity increases, in effect some of the light will reflect back and forth between the two windows (i.e., in the water sample), equivalently increasing the optical path. The reflectivity is different, and the equivalent optical path length is different. Different equivalent optical distances can be realized through the design and coating of the window reflectivity. In the case of fig. 3, the equivalent optical length is different for each different reflectivity (ring in the figure). When light passes through the window, the equivalent optical path length can be obtained by calculation or calibration at different positions of the light spot and corresponding to different optical path lengths. Different equivalent optical lengths can be realized only by adjusting the diaphragm to the corresponding size and only allowing the light in the middle part to pass through.
For the film coating situation in fig. 3, in actual operation, the center may be coated with an antireflection film, that is, the reflectivity is close to zero, if two different reflectivities are selected, the second ring may select the reflectivity as required, so that an equivalent double optical path may be realized, and a conventional optical path structure that can be realized by using a double optical path is completed.
Claims (6)
1. A method for realizing variable optical path water quality monitoring is characterized by comprising the following steps: the method comprises the following steps:
A. turning on a light source, reducing an iris diaphragm to only allow light to pass through a middle window part of the variable reflectivity mirror, and measuring the light absorption of a water sample;
B. adjusting the iris diaphragm to enable light corresponding to the second reflectivity window to pass through, measuring light absorption of the water sample, wherein the light absorption comprises a middle reflectivity part and a second reflectivity part, and reversely solving the light absorption when only the second reflectivity part exists through the first group of test data;
C. calculating the absorption coefficient of the water sample by combining the equivalent optical paths corresponding to different reflectivities and the light absorption corresponding to the equivalent optical paths;
a water sample to be detected is arranged between the two variable reflectivity mirrors, one side outside the two variable reflectivity mirrors is provided with an iris diaphragm, and the other side outside the two variable reflectivity mirrors is provided with a light source; the light source is positioned at one side outside the two variable reflectivity mirrors, and a collimating lens is arranged between the light source and the adjacent variable reflectivity mirror and is used for collimating the light incident to the variable reflectivity mirror into parallel light; the other side of the two variable reflectivity mirrors is provided with a focusing lens and a light intensity or/and spectrum analysis part, and the focusing lens is positioned between the iris diaphragm and the analysis part on the side.
2. The method for realizing the optical path-variable water quality monitoring as claimed in claim 1, is characterized in that: before step a, selecting a variable reflectance mirror, where the step of selecting the variable reflectance mirror is:
a. selecting an optical path range to be realized;
b. calculating the reflectivity of the window required for coating according to the size of the equivalent optical path required to be realized;
c. designing a film system according to the requirement of reflectivity;
d. and (5) optical coating.
3. The method for realizing the optical path-variable water quality monitoring as claimed in claim 1, is characterized in that: and the sequence of the step B and the step A is interchanged.
4. The method for realizing the optical path-variable water quality monitoring as claimed in claim 1, is characterized in that: the variable-reflectivity mirror is plated with a thin film with reflectivity changing along with the position, and the reflectivity of adjacent positions is increased or decreased in sequence.
5. The method for realizing the optical path-variable water quality monitoring as claimed in claim 1, is characterized in that: the reflectivity of the adjacent positions of the variable reflectivity mirrors is increased and decreased continuously or increased and decreased in a step mode.
6. The method for realizing the optical path-variable water quality monitoring as claimed in claim 1, is characterized in that: the center of the variable reflectivity mirror is a circular film, and the other films are sequentially sleeved outside the circular film in an annular structure.
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| CN204495711U (en) * | 2015-04-03 | 2015-07-22 | 中兴仪器（深圳）有限公司 | A kind of concentration measurements device |
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| US5742054A (en) * | 1995-09-01 | 1998-04-21 | Innovative Lasers Corporation | Ultra-sensitive detection of contaminants in corrosive gas via intracavity laser spectroscopy (ILS) |
| US6791736B2 (en) * | 2001-06-19 | 2004-09-14 | Teralum Llc | Optical device for dispersion compensation |
| CA2880038C (en) * | 2012-07-27 | 2021-06-01 | Thorlabs, Inc. | Agile imaging system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101852727A (en) * | 2010-05-18 | 2010-10-06 | 浙江大学 | Optical detection method for continuously monitoring liquid concentration |
| CN102914503A (en) * | 2012-09-26 | 2013-02-06 | 华侨大学 | Spectrum analyzer and preparation method of G-T resonant cavity array of spectrum analyzer |
| CN204495711U (en) * | 2015-04-03 | 2015-07-22 | 中兴仪器（深圳）有限公司 | A kind of concentration measurements device |
| CN105784593A (en) * | 2015-07-03 | 2016-07-20 | 清华大学 | Quadruplet objective lens Chernin type multi-optical-distance gas absorption cavity |
| CN205120578U (en) * | 2015-10-28 | 2016-03-30 | 北京农业信息技术研究中心 | Water ammonia nitrogen on -line measuring system |
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