CN211292571U - Spectrometer with built-in optical filter - Google Patents
Spectrometer with built-in optical filter Download PDFInfo
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- CN211292571U CN211292571U CN201922188453.2U CN201922188453U CN211292571U CN 211292571 U CN211292571 U CN 211292571U CN 201922188453 U CN201922188453 U CN 201922188453U CN 211292571 U CN211292571 U CN 211292571U
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Abstract
The utility model discloses a spectrum appearance of built-in light filter, the spectrum appearance includes: light source, spectral measurement unit, wavelength filter unit, data acquisition and communication circuit, the spectral measurement unit includes: concave grating and photoelectric array detector; the wavelength filtering unit includes: the filter set is provided with bandpass filters with different central wavelengths; the light source is imaged on the photoelectric array detector after being split by the concave grating, and the photoelectric array detector receives optical signals with different wavelengths and converts the optical signals into electric signals. The product can detect the spectrum signal of a specific wave band, and the signal-to-noise ratio of spectrum detection is improved.
Description
Technical Field
The utility model relates to an environmental monitoring instrument field especially relates to a spectrum appearance of built-in light filter.
Background
With the development of economy and the acceleration of urbanization process in China, the problem of environmental pollution is becoming more serious. Water resources are closely related to production and life of people, and the water environment is seriously damaged by illegal discharge of industrial wastewater, use of chemical pesticides, substandard treatment of urban domestic wastewater and the like. The most direct influence brought by water pollution is serious threat to human health, according to relevant statistics, the water environment quality of China is not optimistic, the surface water is generally lightly polluted, even part of urban river reach is seriously polluted, and how to effectively control or treat the water pollution, protect the water environment and promote the sustainable development of national economy becomes an important social and economic problem.
The spectrum technology has the advantages of no need of pretreatment, high analysis speed and capability of realizing simultaneous detection of multiple components on line, and is widely applied to qualitative and quantitative analysis research of various substance components. The water quality detection technology based on the ultraviolet-visible spectrum method has the advantages of low instrument cost, convenience in operation, high detection speed, no secondary pollution and the like, and has wide application prospects in the field of online water quality monitoring. The development of related technologies and instruments in the world is early, and an immersed ultraviolet-visible spectrum water quality analyzer is developed by a research team of the Vienna university, can simultaneously measure parameters such as COD, TSS and NO3-N, and has good repeatability and measurement precision. The on-line water quality COD detector of UVM-4020 type ultraviolet absorption method produced by Shimadzu in Japan adopts a weighted multi-wavelength method, thereby further improving the detection precision. The full spectrum on-line measuring system of STIP-scan CAS74 produced by Germany E + H company realizes the simultaneous detection of a plurality of pollutants.
The existing spectrum measuring instrument is narrow in coverage wavelength range and cannot completely cover the absorption characteristics of different water quality pollution components, in addition, a photoelectric detector is adopted in the spectrum instrument adopting a grating light splitting mode to convert an optical signal into an electric signal, the noise of the photoelectric detector is closely related to the incident light intensity, and when the incident light intensity on the photoelectric detector is too strong, the noise of the photoelectric detector is possibly increased to influence the signal-to-noise ratio of spectrum measurement.
SUMMERY OF THE UTILITY MODEL
The utility model provides a spectrum appearance of built-in light filter adopts integration concave grating and photoelectric array detector, and built-in band pass filter can detect the spectral signal of specific wave band, improves the SNR that the spectrum detected, sees the following description in detail:
a spectrometer with an internal optical filter, the spectrometer comprising: a light source, a spectrum measuring unit, a wavelength filtering unit, a data acquisition and communication circuit,
the spectrum measuring unit includes: concave grating and photoelectric array detector;
the wavelength filtering unit includes: the filter set is provided with bandpass filters with different central wavelengths;
the light source is imaged on the photoelectric array detector after being split by the concave grating, and the photoelectric array detector receives optical signals with different wavelengths and converts the optical signals into electric signals.
Further, the spectrometer further comprises: the light source shields the shell.
Wherein the spectrometer further comprises: and a sample cell.
Further, the light source includes: a halogen lamp and a concave reflector.
Wherein the spectrometer adopts an optical fiber interface.
The utility model provides a technical scheme's beneficial effect is:
1. the product adopts the integrated concave grating and the photoelectric array detector, so that the spectral measurement stability is improved;
2. the wavelength calibration unit is arranged in the product, and the combination of the band-pass filters is adopted, so that the detection of the spectral signals of specific wave bands is realized after the band-pass filters with different wavelengths are switched, and the signal-to-noise ratio of the spectral detection is improved;
3. the spectrum measurement light source and the spectrum detection unit both adopt optical fiber interfaces, are convenient to be connected with other measurement accessories and can be applied to various occasions;
4. the light source adopts the halogen lamp and the concave reflector, so that the energy of the light source can be effectively focused into the optical fiber, and the light source efficiency is improved.
Drawings
Fig. 1 is a schematic structural diagram of a spectrometer with a built-in filter.
In the drawings, the components represented by the respective reference numerals are listed below:
1: an optical fiber interface; 2: a concave grating;
3: a filter set; 4: a motor;
5: a photo array detector; 6: an instrument light-shielding housing;
7: a data acquisition and communication circuit; 8: a halogen lamp;
9: a concave reflector; 10: a light source shading shell;
11: and a sample cell.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, embodiments of the present invention are described in further detail below.
The utility model discloses a built-in light filter's spectrum appearance, see figure 1, include: the halogen lamp 8 and the concave reflector 9 are adopted as the light source, so that the energy of the light source can be effectively focused into the optical fiber through the optical fiber interface 1, and the light source efficiency is improved.
The utility model discloses an optical fiber interface 1 can conveniently be installed with other measurement annexs. Namely, the light source is composed of a halogen lamp 8, a concave reflector 9 and an optical fiber interface 1.
The spectrometer comprises a spectrum measuring unit which adopts a concave grating 2 and a photoelectric array detector 5, a wavelength correcting unit which comprises a filter set 3 and a motor 4, and a data acquisition and communication circuit 7.
The concave grating 2 has the functions of dispersion and light beam focusing, no ghost line exists after light splitting, stray light is extremely small, the dispersion ratio and the resolution ratio are greatly improved, and the effects of leveling the field and improving the resolution ratio are remarkable.
The light is split by the concave grating 2 and then imaged on the photoelectric array detector 5, each pixel of the photoelectric array detector 5 receives optical signals with different wavelengths and converts the optical signals into electric signals, and the data communication with other equipment can be conveniently realized through the data acquisition and communication circuit 7.
The filter set 3 is installed with bandpass filters with different center wavelengths (in this embodiment, filters with four center wavelengths are selected according to the spectrum measurement range, the center wavelengths are respectively 420nm, 550nm, 610nm, and 750nm, and the pass band widths are all 100nm), and the filter set 3 can realize automatic switching of the bandpass filters with different center wavelengths through connection with the motor 4.
In specific implementation, filters with other central wavelengths can be selected according to the requirements in practical application.
In the process of spectral measurement, in order to further improve the signal-to-noise ratio and the quantitative analysis precision of spectral measurement, the band-pass filters with different central wavelengths can be switched according to the absorption spectrum characteristics of a measured substance, so that the characteristic detection of a target waveband is realized, and the signal-to-noise ratio of the spectral detection is improved.
The spectrometer adopts the optical fiber interface 1, and can be conveniently connected with other measuring accessories.
And the light source shading shell 10 is used for isolating the working light source from external light and simultaneously playing a role in dust prevention and heat insulation.
And a sample cell 11 for containing a sample to be measured.
Wherein, in the spectrum collection process, the output light of halogen lamp 8 inserts sample cell 11 at first, and the emergent light through sample cell 11 passes through optical fiber interface 1 and inserts, and the spectral measurement process can be described as:
the halogen lamp 8 is switched off and the dark noise I is measuredd；
The halogen lamp 8 is switched on and the background spectrum I is then acquired without a water sample in the sample cell 110；
Introducing a water sample into a sample cell 11, and collecting a sample spectrum I;
calculating to obtain the water sample absorbance A in different optical paths as follows:
the above process for calculating the absorbance a is well known to those skilled in the art, and the details are not repeated in this example.
The embodiment of the utility model provides a except that doing special explanation to the model of each device, the restriction is not done to the model of other devices, as long as can accomplish the device of above-mentioned function all can.
Those skilled in the art will appreciate that the drawings are only schematic illustrations of preferred embodiments, and the embodiments of the present invention are given the same reference numerals and are not intended to represent the merits of the embodiments.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (5)
1. A spectrometer with an internal optical filter, the spectrometer comprising: a light source, a spectrum measuring unit, a wavelength filtering unit, a data acquisition and communication circuit,
the spectrum measuring unit includes: concave grating and photoelectric array detector;
the wavelength filtering unit includes: the filter set is provided with bandpass filters with different central wavelengths;
the light source is imaged on the photoelectric array detector after being split by the concave grating, and the photoelectric array detector receives optical signals with different wavelengths and converts the optical signals into electric signals.
2. The spectrometer with an internal optical filter as claimed in claim 1, wherein the spectrometer further comprises: the light source shields the shell.
3. The spectrometer with an internal optical filter as claimed in claim 1, wherein the spectrometer further comprises: and a sample cell.
4. The spectrometer of claim 1, wherein the light source comprises: a halogen lamp and a concave reflector.
5. The spectrometer with an internal optical filter as claimed in claim 1, wherein the spectrometer employs an optical fiber interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922188453.2U CN211292571U (en) | 2019-12-09 | 2019-12-09 | Spectrometer with built-in optical filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922188453.2U CN211292571U (en) | 2019-12-09 | 2019-12-09 | Spectrometer with built-in optical filter |
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| Publication Number | Publication Date |
|---|---|
| CN211292571U true CN211292571U (en) | 2020-08-18 |
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| CN201922188453.2U Active CN211292571U (en) | 2019-12-09 | 2019-12-09 | Spectrometer with built-in optical filter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024052804A1 (en) * | 2022-09-05 | 2024-03-14 | Lincoln Agritech Limited | Systems and methods for measuring properties of water at site |
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2019
- 2019-12-09 CN CN201922188453.2U patent/CN211292571U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024052804A1 (en) * | 2022-09-05 | 2024-03-14 | Lincoln Agritech Limited | Systems and methods for measuring properties of water at site |
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