CN112255181A - Miniature spectrometer for water quality on-line monitoring - Google Patents
Miniature spectrometer for water quality on-line monitoring Download PDFInfo
- Publication number
- CN112255181A CN112255181A CN202011120922.8A CN202011120922A CN112255181A CN 112255181 A CN112255181 A CN 112255181A CN 202011120922 A CN202011120922 A CN 202011120922A CN 112255181 A CN112255181 A CN 112255181A
- Authority
- CN
- China
- Prior art keywords
- optical fiber
- concave
- water quality
- slit
- grating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- 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
- G01N21/255—Details, e.g. use of specially adapted sources, lighting or optical systems
-
- 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
- G01N2021/0112—Apparatus in one mechanical, optical or electronic block
Abstract
The embodiment of the invention provides a micro spectrometer for online monitoring of water quality, which comprises: the optical fiber monitoring device comprises an optical fiber, a slit, a concave reflector, a concave grating and a photoelectric detector, wherein the emergent end of the optical fiber is arranged in the slit, the concave reflector is arranged in the light path range of the optical fiber after being adjusted by the slit, the concave grating is arranged in the reflection light path range of the concave reflector, and the photoelectric detector is used for monitoring optical signals reflected by the concave grating. According to the micro spectrometer for on-line water quality monitoring provided by the embodiment of the invention, the concave reflector is arranged between the optical fiber and the optical path of the concave grating, so that the wavefront compression of a spectrum is realized, the performance requirement of the grating is reduced, the cost is reduced, the compression of the spectrum width and the imaging width and the change of the spectrum direction are realized, the structure of the spectrometer is simplified, the volume of the device is reduced, the spectrum sensitivity is increased, the spectrum measurement precision is improved, the micro spectrometer is suitable for a more complicated measurement environment, and more effective data are provided for the traceability of nondestructive detection.
Description
Technical Field
The invention relates to the technical field of water quality monitoring, in particular to a micro spectrometer for online monitoring of water quality.
Background
The full spectrum water quality on-line monitoring device can simultaneously monitor COD, temperature, TOC, BOD and O3Various pollutant parameters such as turbidity, organic matters (benzenes), nitrate nitrogen and the like, and no secondary pollution discharge is generated, so that the method is widely applied to water quality monitoring.
The ultraviolet visible spectrometer in the full-spectrum online water quality monitoring device is a core device, and high resolution, low cost and miniaturization are the keys. At present, two main schemes are adopted, one scheme is that a traditional crossed asymmetric Cheney-Turner optical path (namely a Czerny-Turner optical path) is adopted, the monitoring mode has high resolution, but the structure is complex, the cost is high, the miniaturization difficulty is high, and the application requirement of water quality monitoring cannot be met. The second method is a flat field concave holographic grating method, which can realize miniaturization and high sensitivity, but the grating used by the method has high processing difficulty, high cost, low grating groove density, limited resolution and difficult environment tracing detection.
Disclosure of Invention
The embodiment of the invention provides a micro spectrometer for online monitoring of water quality, which is used for solving the defects of high miniaturization difficulty and high cost of a crossed asymmetric Chenier-Telner light path and low resolution and high cost of a flat-field concave holographic grating light path in the prior art.
The embodiment of the invention provides a micro spectrometer for online monitoring of water quality, which comprises: the optical fiber monitoring device comprises an optical fiber, a slit, a concave reflector, a concave grating and a photoelectric detector, wherein an emergent end of the optical fiber is arranged in the slit, the concave reflector is arranged in a light path range of the optical fiber after being adjusted by the slit, the concave grating is arranged in a reflection light path range of the concave reflector, and the photoelectric detector is used for monitoring an optical signal reflected by the concave grating.
The optical fiber adjusting device comprises an optical fiber adjusting device, wherein the optical fiber is arranged in the optical fiber adjusting device, the cross section of a light inlet of the optical fiber adjusting device is circular, and a slit is arranged at a light outlet of the optical fiber adjusting device.
The cross section of the light outlet of the optical fiber adjusting device is rectangular, and the width of the rectangle is matched with the diameter of the optical fiber.
The concave grating is a flat-field concave holographic grating.
Wherein the curvature of the concave reflector is non-uniformly distributed.
The optical fiber, the slit, the concave reflector, the concave grating and the photoelectric detector are all arranged inside the shell.
According to the micro spectrometer for on-line water quality monitoring provided by the embodiment of the invention, the concave reflector is arranged between the optical fiber and the optical path of the concave grating, so that the wavefront compression of a spectrum is realized, the performance requirement of the grating is reduced, the cost is reduced, the compression of the spectrum width and the imaging width and the change of the spectrum direction are realized, the structure of the spectrometer is simplified, the volume of the device is reduced, the spectrum sensitivity is increased, the spectrum measurement precision is improved, the micro spectrometer is suitable for a more complicated measurement environment, and more effective data are provided for the traceability of nondestructive detection.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a micro spectrometer for online monitoring of water quality according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of an optical fiber adjusting apparatus according to an embodiment of the present invention;
FIG. 3 is a schematic cross-sectional view of a light inlet of an optical fiber adjusting apparatus according to an embodiment of the present invention;
FIG. 4 is a schematic cross-sectional view of a light outlet of an optical fiber adjusting apparatus according to an embodiment of the present invention.
Reference numerals:
1: an optical fiber; 2: a slit; 3: a concave reflector; 4: flat field concave holographic grating; 5: a photodetector; 6: an optical fiber adjusting device; 61: a light inlet; 62: and a light outlet.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all, embodiments of the present invention. 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.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; the connection can be mechanical connection or point connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The micro spectrometer for online monitoring of water quality according to the embodiment of the present invention is described below with reference to fig. 1, and includes: the optical fiber monitoring device comprises an optical fiber 1, a slit 2, a concave reflector 3, a concave grating and a photoelectric detector 5, wherein the emergent end of the optical fiber 1 is arranged in the slit 2, the concave reflector 3 is arranged in the light path range of the optical fiber 1 adjusted by the slit 2, the concave grating is arranged in the reflection light path range of the concave reflector 3, and the photoelectric detector 5 is used for monitoring optical signals reflected by the concave grating.
It is to be understood that the broken lines in fig. 1 represent the optical path ranges.
Specifically, in this embodiment, an optical signal is transmitted by an optical fiber 1, enters the inside of the spectrometer through a slit 2, and is focused and redirected by a concave mirror 3, so that the light is reflected onto a concave grating and is fully split, and finally, the split optical signal is irradiated onto a photodetector 5, thereby realizing monitoring and measurement of a spectrum.
In the embodiment, due to the introduction of the concave reflector 3, the wavefront compression of a spectrum is realized, and the compression of the spectrum width and the imaging width and the change of the spectrum direction are realized at the same time, so that the spectrometer is easier to miniaturize and structure miniaturize; in addition, the compression of the imaging width greatly increases the spectral sensitivity, and other auxiliary measures (such as adding a cylindrical mirror) are not needed to increase the optical sensitivity, so that the structure is simplified, and the cost is reduced.
According to the micro spectrometer for on-line monitoring of water quality provided by the embodiment of the invention, the concave reflector 3 is arranged between the optical fiber 1 and the optical path of the concave grating, so that the wave front compression of a spectrum is realized, the performance requirement of the grating is reduced, the cost is reduced, the compression of the spectrum width and the imaging width and the change of the spectrum direction are realized, the structure of the spectrometer is simplified, the volume of the device is reduced, the spectrum sensitivity is increased, the spectrum measurement precision is improved, the micro spectrometer is suitable for a more complicated measurement environment, and more effective data are provided for the tracing of nondestructive detection.
In one embodiment, as shown in fig. 2 to 4, the micro spectrometer for online monitoring of water quality further includes an optical fiber adjusting device 6, the optical fiber 1 is disposed in the optical fiber adjusting device 6, a cross section of a light inlet 61 of the optical fiber adjusting device 6 is circular, and the slit 2 is disposed at a light outlet 62 of the optical fiber adjusting device 6. In the present embodiment, the optical fiber adjusting device 6 is mainly used for adjusting the arrangement state of the optical fibers 1, the optical fibers 1 are circularly arranged when entering from the light inlet 61, and after adjustment, the optical fibers 1 are linearly arranged when exiting from the light outlet 62 (i.e. the slit 2).
In one embodiment, as shown in FIG. 4, the light outlet 62 of the optical fiber adjusting device 6 has a rectangular cross section, and the width of the rectangle matches the diameter of the optical fiber 1. It can be understood that the size of the rectangle happens to be capable of accommodating a single row of optical fibers 1, that is, the width of the rectangle is matched with the slit width of the slit 2, and the length of the rectangle is matched with the slit height of the slit 2, in this embodiment, the light outlet 62 of the optical fiber adjusting device 6 is used for replacing the slit 2, so that the cost is greatly reduced, the influence of the processing quality of the slit 2 on the performance of the spectrometer is avoided, and the signal-to-noise ratio of the ultraviolet spectrum is improved.
In one embodiment, the concave grating is a flat-field concave holographic grating 4. It should be understood that those skilled in the art may also use other high groove gratings instead, so as to improve the spectral resolution and stability, and be more beneficial to the application of tracing detection, and if the flat-field concave holographic grating 4 is used, it is more suitable for the water quality spectrometer.
In one embodiment, the curvature of the concave mirror 3 is non-uniformly distributed (i.e. the concave mirror 3 with variable curvature), so that the problem that the spectral focal positions are not on the same horizontal plane due to the introduction of the concave mirror is solved, and the problem of spectral deformity is solved. The curvature of the upper part of the concave reflector 3 is larger than that of the lower part or the curvature of the lower part is larger than that of the upper part according to actual conditions.
In one embodiment, the micro spectrometer for online monitoring of water quality further comprises a housing, and the optical fiber 1, the slit 2, the concave reflector 3, the concave grating and the photodetector 5 are all mounted inside the housing. In this embodiment, the housing is used to enclose working elements inside the spectrometer, and plays roles of dust prevention, support and the like.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (6)
1. A miniature spectrometer for water quality on-line monitoring, characterized by comprising: the optical fiber monitoring device comprises an optical fiber, a slit, a concave reflector, a concave grating and a photoelectric detector, wherein an emergent end of the optical fiber is arranged in the slit, the concave reflector is arranged in a light path range of the optical fiber after being adjusted by the slit, the concave grating is arranged in a reflection light path range of the concave reflector, and the photoelectric detector is used for monitoring an optical signal reflected by the concave grating.
2. The micro spectrometer for online monitoring of water quality as claimed in claim 1, further comprising an optical fiber adjusting device, wherein the optical fiber is disposed in the optical fiber adjusting device, a cross section of a light inlet of the optical fiber adjusting device is circular, and the slit is disposed at a light outlet of the optical fiber adjusting device.
3. The micro spectrometer for online monitoring of water quality as claimed in claim 2, wherein the cross section of the light outlet of the optical fiber adjusting device is rectangular, and the width of the rectangle matches with the diameter of the optical fiber.
4. The micro spectrometer for the online monitoring of water quality as claimed in claim 1, wherein the concave grating is a flat field concave holographic grating.
5. The micro spectrometer for the on-line monitoring of water quality as claimed in claim 1, wherein the curvature of the concave mirror is non-uniformly distributed.
6. The micro spectrometer for online monitoring of water quality as claimed in claim 1, further comprising a housing, wherein the optical fiber, the slit, the concave reflecting mirror, the concave grating and the photodetector are all mounted inside the housing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011120922.8A CN112255181A (en) | 2020-10-19 | 2020-10-19 | Miniature spectrometer for water quality on-line monitoring |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011120922.8A CN112255181A (en) | 2020-10-19 | 2020-10-19 | Miniature spectrometer for water quality on-line monitoring |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112255181A true CN112255181A (en) | 2021-01-22 |
Family
ID=74245061
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011120922.8A Pending CN112255181A (en) | 2020-10-19 | 2020-10-19 | Miniature spectrometer for water quality on-line monitoring |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112255181A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1407366A (en) * | 2001-08-31 | 2003-04-02 | 力捷电脑股份有限公司 | Scanner concave mirror optical system device |
| CN102156100A (en) * | 2011-04-06 | 2011-08-17 | 浙江大学 | Multispectral-based multipoint sampling multiparameter water quality on-line analytical system |
| CN102435311A (en) * | 2011-09-07 | 2012-05-02 | 杭州远方光电信息股份有限公司 | Optical fiber bundle spectrometer |
| CN203688067U (en) * | 2013-12-31 | 2014-07-02 | 苏州大学 | Digital controllable spectroscopic light source system |
| CN109477968A (en) * | 2016-07-07 | 2019-03-15 | 麦克赛尔株式会社 | Head-up display |
| CN110073275A (en) * | 2017-11-14 | 2019-07-30 | Jvc 建伍株式会社 | Virtual image display apparatus |
-
2020
- 2020-10-19 CN CN202011120922.8A patent/CN112255181A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1407366A (en) * | 2001-08-31 | 2003-04-02 | 力捷电脑股份有限公司 | Scanner concave mirror optical system device |
| CN102156100A (en) * | 2011-04-06 | 2011-08-17 | 浙江大学 | Multispectral-based multipoint sampling multiparameter water quality on-line analytical system |
| CN102435311A (en) * | 2011-09-07 | 2012-05-02 | 杭州远方光电信息股份有限公司 | Optical fiber bundle spectrometer |
| CN203688067U (en) * | 2013-12-31 | 2014-07-02 | 苏州大学 | Digital controllable spectroscopic light source system |
| CN109477968A (en) * | 2016-07-07 | 2019-03-15 | 麦克赛尔株式会社 | Head-up display |
| CN110073275A (en) * | 2017-11-14 | 2019-07-30 | Jvc 建伍株式会社 | Virtual image display apparatus |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7116418B2 (en) | Spectral imaging apparatus and methods | |
| US4922309A (en) | Spectroscope | |
| US4022534A (en) | Reflectometer optical system | |
| US7864423B2 (en) | Spectrally adjustable filter | |
| US20020060792A1 (en) | Monitoring apparatus for optical transmission systems | |
| US6204919B1 (en) | Double beam spectrometer | |
| WO2012021311A2 (en) | Dynamic wavefront control of a frequency converted laser system | |
| CN211652548U (en) | High-sensitivity Raman spectrometer based on photomultiplier | |
| CN104729708A (en) | Anastigmatic broadband spectrum detection grating spectrometer | |
| CN102004283B (en) | Optical fiber coupling White cavity | |
| CN104267505B (en) | A kind of wedge postpones the grating of depolarization and rotates light-dividing device and method | |
| CN101281061A (en) | High resolution spectral measuring apparatus | |
| CN112255181A (en) | Miniature spectrometer for water quality on-line monitoring | |
| CN203465002U (en) | Transmission grating spectrometer | |
| CN110632058B (en) | Small light splitting device for Raman spectrum analysis | |
| CN113324665B (en) | Wavemeter, method for obtaining parameters of wavemeter and method for on-line calibration | |
| CN212843974U (en) | Transmission type grating T-shaped optical path spectrum light splitting structure for near infrared | |
| CN112326581A (en) | Novel double-beam water quality multi-parameter testing device | |
| CN208887786U (en) | A kind of high resolution spectrometer | |
| CN220120984U (en) | Laser radar beam splitting device | |
| CN219161981U (en) | Fruit and vegetable quality detection receiving device and fruit and vegetable quality detection device | |
| CN214794454U (en) | Light path system in grating type near-infrared analyzer | |
| CN213874657U (en) | Optical fiber spectrometer for testing water quality | |
| CN212059105U (en) | High-resolution and high-sensitivity Raman spectrometer | |
| CN217155793U (en) | Light emitting device and detection apparatus |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |