CN214066916U - Multi-axis differential absorption spectrometer measuring device - Google Patents
Multi-axis differential absorption spectrometer measuring device Download PDFInfo
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- CN214066916U CN214066916U CN202023120783.7U CN202023120783U CN214066916U CN 214066916 U CN214066916 U CN 214066916U CN 202023120783 U CN202023120783 U CN 202023120783U CN 214066916 U CN214066916 U CN 214066916U
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Abstract
The utility model discloses a multi-axis differential absorption spectrometer measuring device, wherein a space optical coupling telescope system is arranged on an electric adjusting frame, the space optical coupling telescope system is connected with a spectrometer, and an optical filter component is arranged at the end part of the space optical coupling telescope system; the optical filter component is provided with a through hole, a shading hole and a plurality of filtering holes for measuring different gases; the optical filter component is arranged on the optical filter component driving mechanism, and the optical filter component driving mechanism can drive the optical filter component to move, so that different through holes in the optical filter component can be coaxial with the spatial light coupling telescope system; the spectrometer, the electric adjusting frame, the sunlight automatic tracking device and the optical filter component driving mechanism are all connected with a computer. The utility model discloses can trail the angle of sunlight, with the angular adjustment of space optical coupling telescope to measuring the position, improve measuring accuracy, the gaseous spectrum of measurement background spectrum, full gloss register for easy and multiple different target simultaneously.
Description
Technical Field
The utility model belongs to the environmental monitoring field specifically is a multiaxis difference absorption spectrometer measuring device.
Background
In the prior art, a multi-axis differential absorption spectrometer measuring system consists of a telescope, an angle regulator, an optical fiber, a spectrometer, a computer and the like. The telescope receives the solar scattered light, the solar scattered light is transmitted to the spectrometer through the optical fiber, the angle regulator drives the telescope to measure the atmospheric absorption spectrum information under each angle, and finally the measured spectrum data is transmitted to the control computer through a USB line to be stored and calculated, so that the concentration information of the vertical columns with different atmospheric components is obtained. However, in the existing measuring system, when the height and the intensity of the sun change during measurement, the measured spectrum can shift. Meanwhile, the existing measuring system can only measure the concentration of single gas, the use is limited to a certain extent, and no measurement of a background spectrum and a full spectrum brings errors to a final calculation result during measurement.
SUMMERY OF THE UTILITY MODEL
For solving the problem that exists among the prior art, the utility model aims to provide a multiaxis differential absorption spectrum appearance measuring device, the utility model discloses can trail the angle of sunlight, with the angular adjustment of space optical coupling telescope to measuring the position, improve the measuring accuracy, the gaseous spectrum of measurement background spectrum, full gloss register for easy and multiple different target simultaneously.
The utility model adopts the technical scheme as follows:
a measuring device of a multi-axis differential absorption spectrometer comprises a space optical coupling telescope system, the spectrometer, an electric adjusting frame, an automatic sunlight tracking device, a computer, an optical filter component and an optical filter component driving mechanism, wherein the space optical coupling telescope system is arranged on the electric adjusting frame and is connected with the spectrometer, and the optical filter component is arranged at the end part of the space optical coupling telescope system; the optical filter component is provided with a through hole, a shading hole and a plurality of filtering holes for measuring different gases; the optical filter component is arranged on the optical filter component driving mechanism, and the optical filter component driving mechanism can drive the optical filter component to move, so that different through holes in the optical filter component can be coaxial with the spatial light coupling telescope system; the spectrometer, the electric adjusting frame, the sunlight automatic tracking device and the optical filter component driving mechanism are all connected with a computer.
Preferably, the optical filter component adopts a disc structure, the center of the optical filter component is connected with the optical filter component driving mechanism, and n through holes are formed in the circumferential direction of the optical filter component; in the n through holes, one of the n through holes is provided with a light screen, the n-2 through holes are respectively provided with a narrow-band filter used for measuring different gases, the through hole provided with the light screen is used as a light shielding hole, and the through hole provided with the narrow-band filter is used as a light filtering hole.
Preferably, the through hole, the shading hole and the filtering hole are all round holes, and the diameters of the through hole, the shading hole and the filtering hole are not smaller than the diameter of the light inlet of the space light coupling telescope system.
Preferably, the filter assembly is spaced from the end of the spatial light coupling telescope system by 5-10 mm.
Preferably, the optical filter assembly driving mechanism adopts a stepping motor, an output shaft of the stepping motor is parallel to the axis of the space optical coupling telescope system, and an output shaft of the stepping motor is connected with the optical filter assembly.
Preferably, the stepping motor is arranged at the end of the space optical coupling telescope system.
Preferably, the space optical coupling telescope system is provided with a standard gas inlet and a standard gas outlet, and the standard gas inlet and the standard gas outlet are communicated with the inner cavity of the space optical coupling telescope system.
Preferably, the standard gas inlet and the standard gas outlet are respectively positioned at two ends of the space optical coupling telescope system.
The utility model discloses following beneficial effect has:
the utility model discloses multiaxis difference absorption spectrometer measuring device is through setting up sunlight automatic tracking device, sunlight automatic tracking device links to each other with the computer, consequently, utilize sunlight automatic tracking device to the tracking information of sunlight, the computer can control the electric adjusting bracket and move, adjust the angle of pitch of space optical coupling telescope system, consequently, can be according to the altitude angle and the intensity of the sunlight when measuring, revise and compensate measurement spectrum, make space optical coupling telescope system reduce or avoid when solar altitude and intensity change, the problem that the measurement spectrum can take place to drift. Through setting up the optical filter subassembly, set up through-hole, shading hole and a plurality of on the optical filter subassembly and be used for measuring the filtering hole to different gases, consequently the utility model discloses can once only measure background spectrum, full gloss register for easy reference and the gaseous spectrum of multiple difference target, through setting up optical filter subassembly actuating mechanism, can control through-hole, shading hole and a plurality of on the optical filter subassembly actuating mechanism messenger optical filter group through the computer and be used for measuring the filtering hole to different gases and carry out automatic switch-over, consequently the utility model discloses need not through manual intervention when measuring, can realize the measurement to different target gas spectra according to the demand automatically.
Furthermore, the optical filter component adopts a disc structure, the center of the optical filter component is connected with the optical filter component driving mechanism, and the optical filter component driving mechanism can realize the switching measurement of the through hole, the shading hole and the plurality of optical filter holes on the optical filter component by rotating the optical filter component.
Furthermore, the optical filter assembly driving mechanism adopts a stepping motor, and the optical filter assembly driving mechanism is small and exquisite, has accurate corner control and can further ensure the measurement precision.
Furthermore, a standard gas inlet and a standard gas outlet are arranged on the space optical coupling telescope system and are communicated with the inner cavity of the space optical coupling telescope system, so that standard gas can be introduced into the space optical coupling telescope system through the standard gas inlet and the standard gas outlet, the on-line calibration of the space optical coupling telescope system can be realized, the calibration efficiency is improved, and the effective working time of the space optical coupling telescope system is prolonged.
Drawings
Fig. 1 is a schematic structural diagram of the measuring and calibrating device of the multi-axis differential absorption spectrometer of the present invention;
fig. 2 is a schematic view of the optical filter assembly according to the present invention.
The symbols in the figure: 1. the device comprises a space optical coupling telescope system, 2, a transmission optical fiber, 3, a spectrometer, 4, an electric adjusting frame, 5, an automatic sunlight tracking device, 6, a computer, 101, a standard gas inlet, 102, a standard gas outlet, 103, a stepping motor, 104, a light filter assembly, 1041, a through hole, 1042, a shading sheet, 1043, a narrow-band light filter 1, 1044 and a narrow-band light filter 2.
Detailed Description
The invention is further described with reference to the following figures and examples.
Referring to fig. 1, the utility model discloses multiaxis difference absorption spectrometer measuring device, including space optical coupling telescope system 1, spectrum appearance 3, electronic alignment jig 4, sunlight automatic tracking device 5, computer 6, light filter subassembly 104 and light filter subassembly actuating mechanism, space optical coupling telescope system 1 is installed in electronic alignment jig 4, space optical coupling telescope system 1 is connected with spectrum appearance 3, light filter subassembly 104 sets up in the tip of space optical coupling telescope system 1; the optical filter assembly 104 is provided with a through hole 1041, a shading hole and a plurality of filtering holes for measuring different gases; the optical filter assembly 104 is arranged on an optical filter assembly driving mechanism, and the optical filter assembly driving mechanism can drive the optical filter assembly 104 to move, so that different through holes on the optical filter assembly 104 can be coaxial with the spatial light coupling telescope system 1; the spectrometer 3, the electric adjusting frame 4, the sunlight automatic tracking device 5 and the optical filter component driving mechanism are all connected with the computer 6.
As a preferred embodiment of the present invention, referring to fig. 1 and fig. 2, the optical filter assembly 104 adopts a disc structure, the center of the optical filter assembly 104 is connected to the optical filter assembly driving mechanism, and the optical filter assembly 104 is provided with n through holes in the circumferential direction thereof; in the n through holes, one through hole is not provided with anything (used for directly passing through sunlight), one through hole is provided with a light shielding plate 1042, n-2 through holes are respectively provided with a narrow band filter used for measuring different gases, the through hole provided with the light shielding plate 1042 is used as a light shielding hole, and the through hole provided with the narrow band filter is used as a light filtering hole.
As the utility model discloses preferred embodiment, through-hole, shading hole and filter hole are the round hole, and the diameter is not less than the diameter of space optical coupling telescope system 1 light entry.
As a preferred embodiment of the present invention, the distance between the filter assembly 104 and the end of the space optical coupling telescope system 1 is 5-10 mm.
As a preferred embodiment of the present invention, the optical filter assembly driving mechanism employs a stepping motor 103, an output shaft of the stepping motor 103 is parallel to an axis of the space optical coupling telescope system 1, and an output shaft of the stepping motor 103 is connected to the optical filter assembly 104.
As a preferred embodiment of the present invention, the stepping motor 103 is disposed at the end of the space optical coupling telescope system 1.
As the preferred embodiment of the present invention, the space optical coupling telescope system 1 is provided with a standard gas inlet 101 and a standard gas outlet 102, and the standard gas inlet 101 and the standard gas outlet 102 are communicated with the inner cavity of the space optical coupling telescope system 1.
As a preferred embodiment of the present invention, the standard gas inlet 101 and the standard gas outlet 102 are respectively located at both ends of the space optical coupling telescope system 1.
Examples
The measuring and calibrating device of the multi-axis differential absorption spectrometer comprises a space optical coupling telescope 1, wherein scattered light received by the space optical coupling telescope 1 is transmitted to a spectrometer 3 through a transmission optical fiber 2, the spectrometer 3 transmits detected spectral signals to a computer 6, and the atmospheric composition vertical column concentration information is obtained through analysis and processing of the computer 6. The space optical coupling telescope 1 is designed to be capable of being introduced into gas absorption cells with different concentrations, the light filter component 104 (four through holes are formed in the light filter component, a light shielding plate 1042 is arranged on one through hole, a light filter 1 is arranged on one through hole, a light filter 2 is arranged on one through hole, no light is arranged in the other through hole, light can directly pass through the through hole) controlled by the stepping motor 103 is arranged in the front of the space optical coupling telescope 1, and the sunlight automatic tracking device 5 and the high-precision electric adjusting frame 4 form a pitch angle adjusting system of the space optical coupling telescope 1. The optical filter component 4 is of a disc structure, the optical filter component 4 is connected with an output shaft of the stepping motor 103, and the stepping motor 103 is controlled by the computer 6, so that different through holes in the optical filter component 4 are driven to be coaxial with the front part of the space optical coupling telescope 1 for measurement and calibration.
The space optical coupling telescope 1 is designed as a gas absorption cell with a standard gas inlet 101 and a standard gas outlet 102, and the standard gas inlet 101 and the standard gas outlet 102 are communicated with the inner cavity of the space optical coupling telescope 1 and are respectively positioned at the front end and the rear end of the space optical coupling telescope 1.
The sunlight automatic tracking device 5 measures the height angle and the intensity of sunlight, controls the electric adjusting frame 4 through the computer 6, and adjusts the pitch angle of the space optical coupling telescope 1 in the vertical direction (0-90 degrees).
The sunlight automatic tracking device 5 can measure the altitude angle and the intensity of sunlight during current measurement, and when the altitude angle and the light intensity of the sun change, the computer 6 is used for compensating and correcting the absorption spectrum. When the sunlight intensity is too large in rainy days, the measurement system automatically stops measuring in rainy days.
When gas is measured, the sunlight automatic tracking device 5 measures the altitude angle and the intensity of the current sunlight, the computer 6 controls the stepping motor 103 to drive the optical filter assembly 104 to rotate, and when the optical filter assembly 104 rotates to the position of the light shielding plate, the optical filter assembly is used for measuring the background noise spectrum of the space optical coupling telescope 1; when the first gas is rotated to the position of the narrow band filter 1, the first gas is used for measuring the atmospheric absorption spectrum of the first gas of the space optical coupling telescope 1; when the second gas is rotated to the position of the narrow band filter 2, the second gas is used for measuring the atmospheric absorption spectrum of the second gas of the space optical coupling telescope 1; when rotated to the position of the through hole, the optical coupling telescope 1 is used for measuring the atmospheric total scattering absorption spectrum of the spatial light. Wherein the cut-off wavelength of the narrow band filter is determined by the wavelength at the characteristic absorption peak of the gas under test.
When gas is calibrated, the computer 6 controls the electric adjusting frame 4 to adjust the space optical coupling telescope 1 to 90 degrees, the sunlight automatic tracking device 5 measures the altitude angle and the intensity of the current sunlight, and the measuring system is calibrated by using standard gas with different concentrations to obtain a calibration curve of the gas.
In the filter assembly 104 shown in FIG. 2, the narrowband filter 1 is used for measuring SO2The wavelength is 290-320nm, the central wavelength is 307.1nm, and the half-peak width is 10 nm; narrow band filter 2 for measuring NO2The wavelength is 330-370nm, the central wavelength is 350.0nm, the half-peak width is 10nm, and the computer 6 controls the stepping motor 104 to realize the rotation of the optical filter assembly 104.
When the space optical coupling telescope 1 is calibrated, the sunlight automatic tracking device 5 measures the current solar altitude and light intensity, and the SO in the atmosphere is obtained when the observation elevation angle is 90 degrees when the solar zenith angle is the smallest due to the change of the sunlight altitude and the intensity2And NO2Absorption of sunlight is minimal. At noon of 12:00, when the zenith angle of the sun is minimum and the observation elevation angle is 90 degrees, the computer 6 controls the high-precision electric adjusting frame 4 to adjust the elevation angle of the telescope system 1 to be 90 degrees, pure nitrogen is introduced from a standard gas inlet 101 of the telescope for calibrating the zero point of the system, and then SO of 0.5ppm, 1ppm and 2ppm is respectively added2And NO2And acquiring absorption spectrum information of three concentration points of the standard gas, and calculating to obtain a calibration curve of the gas concentration according to the absorption spectrum information and concentration relation of four points.
When the measurement is normal, the sunlight automatic tracking device 5 firstly measures the current solar altitude and light intensity, and records the solar altitude and light intensity. The computer 6 controls the high-precision electric adjusting frame 4 to measure the solar absorption spectrum under the angles of 5 degrees, 10 degrees, 15 degrees and 20 degrees respectively. When the measurement is performed at different angles, the computer 6 controls the stepping motor 103 to drive the optical filter assembly 104 to rotate, when the optical filter assembly rotates to the through hole 1041, the full spectrum of the sunlight is measured, when the optical filter assembly rotates to the light shielding plate 1042, the background spectrum of the sunlight is measured, and when the optical filter assembly rotates to the narrow band optical filter 1, the SO is measured2When rotated to the narrowband filter 2, NO is measured2The atmospheric absorption spectrum of (1). Fitting and calculating the measured spectrum by using a DOAS method to obtain SO2Gas and NO2Differential diagonal concentration profile of gas.
In summary, the utility model discloses based on the measurement and calibration system of the sunlight automatic tracking device, can revise and compensate the measurement spectrum according to the altitude angle and the intensity of the sunlight when measuring; the gas calibration system with the space optical coupling telescope system realizes the calibration of the measurement system and can obtain calibration curves of different gases; by arranging the optical filter component, a full spectrum, a background spectrum and a characteristic absorption spectrum of the gas can be measured; the utility model provides a when current multiaxis difference absorption spectrum appearance was measured, because atmospheric aerosol and particulate matter to the measuring error and the problem that measuring device linear curve was markd that the sunlight scattering caused, reduced measuring error, improved measurement accuracy.
Claims (8)
1. A multi-axis differential absorption spectrometer measuring device is characterized by comprising a space optical coupling telescope system (1), a spectrometer (3), an electric adjusting frame (4), a sunlight automatic tracking device (5), a computer (6), an optical filter assembly (104) and an optical filter assembly driving mechanism, wherein the space optical coupling telescope system (1) is installed on the electric adjusting frame (4), the space optical coupling telescope system (1) is connected with the spectrometer (3), and the optical filter assembly (104) is arranged at the end part of the space optical coupling telescope system (1); the optical filter component (104) is provided with a through hole (1041), a shading hole and a plurality of optical filtering holes for measuring different gases; the optical filter component (104) is arranged on the optical filter component driving mechanism, the optical filter component driving mechanism can drive the optical filter component (104) to move, so that different through holes in the optical filter component (104) can be coaxial with the spatial light coupling telescope system (1); the spectrometer (3), the electric adjusting frame (4), the sunlight automatic tracking device (5) and the optical filter component driving mechanism are all connected with a computer (6).
2. The measuring device of the multi-axis differential absorption spectrometer according to claim 1, wherein the optical filter assembly (104) is of a disc structure, the center of the optical filter assembly (104) is connected with the optical filter assembly driving mechanism, and the optical filter assembly (104) is provided with n through holes in the circumferential direction; among the n through holes, one through hole is provided with a light screen (1042), n-2 through holes are respectively provided with a narrow band filter used for measuring different gases, the through hole provided with the light screen (1042) is used as a light shielding hole, and the through hole provided with the narrow band filter is used as a light filtering hole.
3. The measuring device of the multi-axis differential absorption spectrometer according to claim 1, wherein the through hole, the light shielding hole and the light filtering hole are all round holes, and the diameter of the through hole, the light shielding hole and the light filtering hole is not smaller than the diameter of the light inlet of the space light coupling telescope system (1).
4. The multi-axis differential absorption spectrometer measurement device according to claim 1, characterized in that the spacing between the filter assembly (104) and the end of the spatial light coupling telescope system (1) is 5-10 mm.
5. The measuring device of the multi-axis differential absorption spectrometer according to claim 1, wherein the filter assembly driving mechanism adopts a stepping motor (103), an output shaft of the stepping motor (103) is parallel to the axis of the space optical coupling telescope system (1), and an output shaft of the stepping motor (103) is connected with the filter assembly (104).
6. The measurement device of claim 5, wherein the stepping motor (103) is arranged at the end of the space optical coupling telescope system (1).
7. The measuring device of the multi-axis differential absorption spectrometer according to claim 1, wherein the space optical coupling telescope system (1) is provided with a standard gas inlet (101) and a standard gas outlet (102), and the standard gas inlet (101) and the standard gas outlet (102) are communicated with the inner cavity of the space optical coupling telescope system (1).
8. The measurement device of claim 1, wherein the standard gas inlet (101) and the standard gas outlet (102) are respectively located at two ends of the space optical coupling telescope system (1).
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| CN112557326A (en) * | 2020-12-22 | 2021-03-26 | 西安鼎研科技股份有限公司 | Multi-axis differential absorption spectrometer measuring device and working method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112557326A (en) * | 2020-12-22 | 2021-03-26 | 西安鼎研科技股份有限公司 | Multi-axis differential absorption spectrometer measuring device and working method thereof |
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Denomination of utility model: A multi-axis differential absorption spectrometer measuring device Effective date of registration: 20220825 Granted publication date: 20210827 Pledgee: Hanhua Financing Guarantee Co.,Ltd. Shaanxi Branch Pledgor: XI'AN DINGYAN TECHNOLOGY CO.,LTD. Registration number: Y2022980013665 |