KR101237514B1 - Remote detecting apparatus and method for air pollution using differential optical abosrption spectroscopy - Google Patents

Remote detecting apparatus and method for air pollution using differential optical abosrption spectroscopy Download PDF

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KR101237514B1
KR101237514B1 KR1020100068089A KR20100068089A KR101237514B1 KR 101237514 B1 KR101237514 B1 KR 101237514B1 KR 1020100068089 A KR1020100068089 A KR 1020100068089A KR 20100068089 A KR20100068089 A KR 20100068089A KR 101237514 B1 KR101237514 B1 KR 101237514B1
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light
laser
rotating
main body
optical system
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KR1020100068089A
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Korean (ko)
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KR20120007363A (en
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황정배
양현
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황정배
주식회사 녹색기술연구소
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Abstract

The present invention relates to an air pollutant remote measuring apparatus and a measuring method using a differential absorption spectroscopy (DOAS), and more particularly, to detect the light absorbed by the pollutants in the atmosphere by irradiating light in the atmosphere and the type of pollutants B) It relates to a remote air pollutant measuring device and a method for measuring the concentration remotely.
The air pollutant remote measuring apparatus of the present invention includes a transmission optical system for irradiating light to a point in the atmosphere, a main body having a receiving optical system for receiving light reflected by a reflector, and a laser beam irradiated to the transmission optical system. And an optical path aligning means for aligning the path of the light irradiated at the point to the point.

Description

Remote detecting apparatus and method for air pollution using differential optical abosrption spectroscopy

The present invention relates to an air pollutant remote measuring apparatus and a measuring method using a differential absorption spectroscopy (DOAS), and more particularly, to detect the light absorbed by the pollutants in the atmosphere by irradiating light in the atmosphere and the type of pollutants B) It relates to a remote air pollutant measuring device and a method for measuring the concentration remotely.

In general, spectroscopy is the study of the interaction between electromagnetic radiation and a sample (including one or more of gas, solids and liquids). The way the radiation reacts with the sample depends on the nature of the sample.

As the radiation passes through the sample, a particular radiation wavelength is absorbed by the molecules in the sample. The specific wavelength of radiation absorbed is specific to each molecule in a particular sample. By identifying which wavelength of radiation is absorbed, it is possible to identify specific molecules present in the sample.

Differential Optical Absorption Spectrometry (DOAS) is a widely used technique for the detection of various trace gaseous substances in the atmosphere, and basically uses the principle that absorption occurs depending on the wavelength when light passes through a medium. .

The system using the differential absorption spectroscopy has been applied to the atmospheric environment field and presented various functions to the atmospheric measurement field. In particular, the introduction of the differential absorption spectroscopy has provided an opportunity to promote the reorganization of the observation system that enables the calculation of spatial representative concentrations of contaminants existing within the distance of light transmission beyond the conventional concept of the center of observation. .

The system using the differential absorption spectroscopy emits parallel light into the atmosphere using a white light source and detects the light returned by the reflector to quantitatively measure the pollutants such as pollutants having absorption bands in the ultraviolet region and the visible region using the differential absorption spectroscopy. Phosphorus concentration will be determined.

Recently, systems using differential absorption spectroscopy have received great attention as a device that can simultaneously detect various pollutants in the air at a long distance.

The air pollutant measuring device using the differential absorption spectroscopy can be classified into an active system using an artificial light source and a passive system using natural light (eg, solar scattered light, moonlight) according to the light source.

Among these, the active system includes a light source for generating light, a transmission optical system for irradiating light from the light source into the atmosphere, a reception optical system for receiving light reflected by a reflector, a spectrometer for measuring light through the reception optical system, It consists of a computer that automatically analyzes the transmitted data and analyzes the pollutants.

The conventional air pollutant measuring device as described above is irradiated with light to one point of the atmosphere to measure the pollutant, if the distance between the measuring device and one point of the atmosphere to be measured is not a problem, but measurement If the distance between the device and one point of the atmosphere to be measured is far (mainly 100 m or more), there is a problem that it is difficult to accurately irradiate the light irradiated from the transmission optical system to one point of the atmosphere to be measured.

SUMMARY OF THE INVENTION The present invention has been made to improve the above problems, and provides an air pollutant remote measuring apparatus and measuring method capable of accurately irradiating light irradiated from a transmission optical system to any point of the atmosphere to be measured even at a long distance. There is a purpose.

The air pollutant remote measuring apparatus of the present invention for achieving the above object comprises a main body provided with a transmission optical system for irradiating light to a point in the atmosphere, and a receiving optical system for receiving the light reflected by the reflector; And an optical path alignment means for aligning the path of the light irradiated from the transmission optical system to the point by irradiating the laser to the point.

The optical path aligning means includes a laser light emitting element installed in the main body and a laser transmitting optical unit for irradiating a laser generated by the laser light emitting element to the reflector.

The laser transmission optical unit is provided with a laser optical housing installed on the front of the main body, an optical shaping lens installed inside the laser optical housing to shape the light generated from the laser light emitting element, and a divergence angle of the light projected from the optical shaping lens. It characterized in that it comprises a focus lens for adjusting the.

And the air pollutant remote measuring method of the present invention for achieving the above object is an alignment step of aligning the path of the light to be irradiated from the transmission optical system to the point by irradiating the laser to a point in the atmosphere to detect the pollutant; An optical transmission step of irradiating light from the transmission optical system to the point; And a light receiving step of reflecting the light passing through the point to the receiving optical system.

And an optical focusing adjusting step of adjusting the divergence angle of the light irradiated from the transmission optical system according to the distance from the transmission optical system to the point after the alignment step.

As described above, according to the present invention, the light irradiated from the transmission optical system can be accurately aligned at any point in the atmosphere to be measured at a long distance by using the optical path alignment means.

In addition, since the main body can be rotated vertically and east-west, even if the measuring point is changed, light can be easily irradiated to a point in the atmosphere to be detected.

1 is a schematic view showing the configuration of a remote air pollutant measuring device according to an embodiment of the present invention,
FIG. 2 is a perspective view illustrating an air pollutant remote measuring apparatus applied to FIG. 1;
3 is a block diagram illustrating a transmission optical system and a reception optical system applied to FIG. 1;
4 is a block diagram showing an optical path alignment means applied to FIG.
5 is a block diagram showing a variable focusing means of a transmission optical system according to another embodiment of the present invention;
6 is a front view showing a remote air pollutant measuring device according to another embodiment of the present invention.

Hereinafter, a remote air pollutant measuring apparatus according to a preferred embodiment of the present invention with reference to the accompanying drawings will be described in detail.

1 to 4, the present invention includes a main body 10 and an optical path alignment means 100.

The main body 10 includes an artificial light source 82, a transmission optical system 80 for irradiating the light of the artificial light source 82 to a point in the atmosphere, a reflector 110 for reflecting light passing through the point, It includes a receiving optical system 90 for receiving the light reflected back from the reflector 110, a spectrometer 140 for measuring the light received through the receiving optical system 90 using an optical sensor, and a case 11 do. Among the components, the transmission optical system 80, the reception optical system 90, and the spectrometer 140 are installed in a case 11 having a cylindrical structure having a rectangular parallelepiped shape. The main body 10 is transmitted by the spectrometer 140. The data may be automatically computed and connected to the computer 150 for analyzing the contaminants.

The main body 10 is supported by the main frame 40 provided below. Preferably, the main body 10 may be installed to be able to rotate about the main frame 40 and to adjust the vertical tilt. This will be described later.

A light source suitable for a specific wavelength region band may be applied according to the pollutant or the air condition to be measured by the artificial light source 82. As the artificial light source 82, xenon arc light, deuterium light, tungsten halogen light, or the like may be applied. For example, xenon arc light of 500 W class may be used. Although not shown, it is preferable to place an elliptic or circular reflector around the artificial light source 82 in order to maximize the emission area of the artificial light source 82 in order to minimize the loss of the amount of light of the artificial light source 82.

The light generated from the artificial light source 82 is transmitted to the transmission optical system 80. The transmission optical system 80 includes a lens 85 capable of parallelizing the light generated from the artificial light source 82, and the lens 85. It consists of a planar reflection mirror 87 and the optical housing (81) to adjust the path of the light passing through. As the lens, two lenses 85 having a Plano convex structure having good transmittance in the ultraviolet-visible-near infrared wavelength band are used. By properly arranging the two lenses 85, the divergence angle of the irradiation light can be maintained within 0.5 degrees at a maximum distance of 1 km. The transmission optical system housing 81 protrudes from the front surface of the case 11.

The transmission optical system 80 irradiates light to a point in the atmosphere (hereinafter, referred to as a “measurement point”) in which the light generated by the light source 82 is to be measured. In the example shown in FIG. 1, a position spaced upwardly from the top of the chimney 1 is set as a measurement point to measure contaminants in the exhaust gas discharged from the chimney 1. The pollutants in the gas discharged from the chimney 1 absorb the light of different wavelength ranges from the light irradiated from the transmission optical system by their unique characteristics. The light passing through the measurement point is transmitted to the receiving optical system 90 by the reflector 110.

The reflector 110 may use a retro focus lens type reflector to transmit light to the receiving optical system accurately and effectively even at a distance of 100 m or more. Although not specifically illustrated in FIG. 1, the reflector 110 is installed around the top of the chimney by a support fixed to the chimney 1.

The reception optical system 90 for receiving the light reflected by the reflector 110 has the same optical configuration as the transmission optical system 80. The receiving optical system housing 91 protrudes from the front of the case 11. The reception optical system housing 91 is provided adjacent to the transmission optical system housing 81.

The light secured by the reception optical system 90 is incident on the spectrometer 140 to measure light. At this time, between the receiving optical system 90 and the spectrometer 140, the light is diffused according to the aperture ratio of the spectrometer 140, and in order to improve the stability of the measured data at the device level, a bandpass filter suitable for the item to be measured ( A bandpass pilter) and an incident optical system including an optical shutter for minimizing measurement noise by incident light to a spectrometer only when measuring light may be further provided. At this time, the light is transmitted from the receiving optical system 90 to the incident optical system using the optical fiber 92 in order to align the light vertically and enter the spectrometer 140.

When light passing through the incident optical system is incident to the spectrometer 140, the spectrometer 140 detects a wavelength spectrum of the light using an optical sensor. A CCD camera can be used as the optical sensor. The optical sensor converts the light quantity signal of the spectrum into an analog electric signal, and then converts the analog-digital signal into 16 bits and stores it as data.

Data obtained from the spectrometer 140 is automatically calculated in the computer 150 to analyze the contaminants. Instrument function reflection of data, high pass filtering (removes the effects of aerosols, air particles, moisture, etc.), calculation by nonlinear least-squares method, comparison with reference spectra (compared to standard gas concentration), and other compensation (temperature, humidity) The analysis algorithm is automatically performed to reflect the type and concentration of pollutants. The analysis software for the above-described process, the control circuit which implements the automatic measurement routine, is integrated into the computer device.

As such, the present invention emits parallel light into the atmosphere and measures the absorption spectrum of the material of each wavelength band by using differential absorption spectroscopy to measure the type and composition of pollutants present in the atmosphere and data. have.

On the other hand, the transmission optical system 80, the reception optical system 90, the spectrometer 140, the computer 150 described above can be applied to the conventional DOAS system, of course.

The optical path alignment means 100, which is a feature of the present invention, allows the path of the light irradiated from the transmission optical system 80 to be accurately aligned with the measurement point.

The optical path alignment means 100 is installed adjacent to the laser light emitting device 103 installed in the main body unit 10 and the transmission optical system 80 to direct the laser generated by the laser light emitting device 103 to the reflector 110. The laser transmission optical part 104 to irradiate is provided.

The laser transmission optical unit 104 is installed in the laser optical housing 101, the laser optical housing 81, the optical shaping lens 105 for shaping the light generated from the laser light emitting element 103, and the optical shaping lens A focus lens 107 is provided for adjusting the divergence angle of the light projected at 105. The laser optical housing 101 is installed between the transmission optical housing 81 and the reception optical housing 91. The laser generated by the laser light emitting device 103 sequentially passes through the light shaping lens 105 and the focus lens 107 to reach the reflector 110.

On the other hand, the optical path alignment means may further include a light-receiving photodiode (light-receiving photodiode) to receive the laser reflected wave reflected from the reflector 110 to measure the distance to the reflector (110). In this case, the transmission optical system 80 preferably includes variable focusing means so as to vary the divergence angle corresponding to the distance to the reflector 110.

As an example, as illustrated in FIG. 5, a barrel is installed at a front end of a transmission optical housing (not shown), and a focus lens 122 and a zoom lens 121 are installed at the barrel. The driving of the zoom lens 121 is operated at a constant speed by employing the DC motor 124, and the driving of the focus lens is operated by employing a step motor 125. When the variable focusing switch (not shown) is turned ON, the microprocessor 128 drives the zoom motor driver 131 by a program set according to the distance to the measured reflector. The DC motor 124 rotates forward or reverse by the driving signal of the zoom motor driver 131, and the zoom lens 121 is linearly moved by a worm gear (not shown) to zoom. Meanwhile, a focus error is detected by the focus error detection signal processor 127 and input to the microprocessor 128, and is input to the focus lens motor driver 129 through a signal processing process in the microprocessor, which is the focus lens motor. The focus lens motor is operated by the drive signal of the driver. The worm gear (not shown) is driven by the operation of the focus lens motor, and thus the focus lens 122 is also moved to perform auto focus. The focus lens 122 is determined by a position of the slide variable resistor 130.

6 shows a remote air pollutant measuring device according to an embodiment of the present invention. In Figure 6 it is further provided with a rotating unit as mentioned above to facilitate the movement of the body portion when irradiating light to a point in the atmosphere.

Referring to FIG. 6, the rotating unit 30 serves to rotate the main body 10 based on the center line extending in the up and down direction and the up and down direction, and the support unit 20 formed below the main body 10. And a main frame 40.

The support part 20 is formed in a plate shape having a predetermined thickness, and the lower surface of the support part 20 is provided with a rotation shaft 23 which is rotatably installed at both ends in the subframe 50 to be described later.

The pivot shaft 23 is formed in an annular bar shape having a predetermined radius and extends in parallel to the longitudinal direction of the support portion 20. The pivot shaft 23 is provided at the center portion with respect to the width of the support portion 20. At this time, the rotating shaft 23 is rotated by the first rotating member to be described later, the outer peripheral surface by the plurality of fixing brackets 22 so that the support portion 20 can be rotated by the rotational force supplied by the first rotating member. It is fixed to the lower surface of the support part 20.

On the other hand, although not shown in the drawings, unlike the present embodiment, the rotation shaft 23 is not fixed to the lower surface of the support portion 20 by a plurality of fixing brackets 22, but the rotation shaft ( The outer circumferential surface of 23 may be fixed by welding.

The rotating unit 30 is rotatably installed based on the main frame 40 and the center line extending in the vertical direction on the main frame 40, and the support unit 20 is rotatably installed in the vertical direction. 50, a first pivot member 60 for rotating the support 20 in the vertical direction, and a second rotation of the subframe 50 to rotate the support 20 with respect to the center line. The rotating member 70 is provided.

The main frame 40 is formed in a plate shape having a predetermined thickness and extends in a direction parallel to the longitudinal direction of the support 20. The main frame 40 is fixedly installed adjacent to the position where the harmful gas to be measured is generated.

On the other hand, although not shown in the figure, the bearing is provided in the center of the upper surface of the main frame 40 so that the lower end of the rotating shaft member 71 of the second pivot member 70 to be described later can be rotatably installed.

The subframe 50 is formed in a plate shape having a predetermined thickness and extends in the longitudinal direction corresponding to the main frame 40. Two supports 51 are provided on the upper surface of the subframe 50 so as to rotatably support both ends of the rotation shaft 23 of the support 20.

A second pivot member 70 is installed between the subframe 50 and the main frame 40.

The support 51 is formed to extend upward on the upper surface of the support 20, at intervals corresponding to the length of the rotation shaft 23 so as to rotatably support both ends of the rotation shaft 23 of the support 20. Installed apart from each other. The upper surface of the support 51 is provided with a rotating bracket 52 so that both ends of the rotation shaft 23 can be easily supported.

Although not shown in the drawings, the bearing is installed on the rotating bracket 52 at the position where the rotating shaft 23 is supported so that the rotating shaft 23 supported by the rotating bracket 52 can be easily rotated.

On the other hand, the first rotation member 60 according to the present invention will be described in detail as follows.

The first rotation member 60 is a first engagement member 61 fastened to the pivot shaft 23 of the support portion 20, a second engagement member 62 engaged with the first engagement member 61, and the It is provided with a first drive member 63 for rotating the second engagement member 62 to rotate the support portion 20 in the vertical direction.

The first engagement member 61 is a worm gear in which a plurality of gears are formed along the circumferential direction on the outer circumferential surface, and the outer circumferential surface is concave so that the second engagement member 62 to be described later can be easily engaged. The first engagement member 61 is preferably fastened to one end of the rotation shaft 23 so as to prevent interference with the support 20 during rotation.

The second engagement member 62 is formed in a cylindrical shape, and is a worm formed in a spiral shape on an outer circumferential surface thereof so as to be engaged with the first engagement member 61. The rotary shaft of the first driving member 63 is fastened to the end of the second engagement member 62.

The first driving member 63 is installed on the upper surface of the subframe 50, it is preferable that the electric motor for generating a rotational force by electric power. The second engagement member 62 is fastened to the rotation shaft of the first driving member 63 to rotate the support 20 through the second engagement member 62.

On the other hand, the second rotating member 70 according to the present invention will be described in detail as follows.

The second pivot member 70 includes a rotation shaft member 71 protruding downward from the lower surface of the subframe 50, a third engagement member 72 fastened to the rotation shaft member 71, and a third engagement member 72. ) And a second driving member (74) for rotating the fourth engagement member (73) to rotate the subframe (50) with respect to the center line extending in the vertical direction. do.

The rotary shaft member 71 is formed in a round bar shape having a predetermined radius. The rotary shaft member 71 has an upper end surface fixed to the center portion of the subframe 50, and the lower end surface is rotatably installed on the upper surface of the main frame.

The third engagement member 72 has a plurality of gears formed along the circumferential direction on the outer circumferential surface thereof, and preferably, the third engagement member 72 is a worm gear having a concave outer circumferential surface so that the fourth engagement member 73 to be described later can be easily engaged.

The fourth engagement member 73 is formed in a cylindrical shape, and is a worm formed in a spiral shape on an outer circumferential surface thereof so as to be engaged with the third engagement member 72. The rotary shaft of the second driving member 74 is fastened to the end of the fourth engagement member 73.

The second driving member 74 is preferably installed on the lower surface of the subframe 50 and is an electric motor that generates rotational force by electric power. The fourth engagement member 73 is fastened to the rotation shaft of the second driving member 74 to rotate the subframe 50 through the fourth engagement member 73.

The air pollutant remote measuring device according to the present invention can rotate the main body 10 in the vertical and east-west directions, so that even if the measurement target range and position is changed, light can be irradiated to a point in the atmosphere to be easily detected. .

Hereinafter, a method for remotely measuring air pollutants using the air pollutant remote measuring apparatus described above will be described with reference to FIGS. 1 to 4.

First, the laser is irradiated to the measurement point in the atmosphere to detect the contaminants using the optical path alignment means 200. At this time, the main body 10 is moved to aim the laser beam emitted from the laser transmission optical unit 104 at a point to be measured. In this case, when the rotary unit 30 is provided as shown in FIG. 6, the aiming operation can be performed very easily and quickly. The main body unit 10 rotates to the left and right by the rotating unit and at the same time adjusts the tilt in the vertical direction and aims at the point where the laser is to be measured.

As shown in FIG. 1, if the exhaust gas discharged from the chimney 1 is set as a measuring point, it is visually checked whether the laser is aimed at the measuring point. After visually confirming that the laser is aimed at the measurement point, the alignment step is performed, and then the optical transmission step of irradiating light to the measurement point is performed.

In the optical transmission step, when power is applied to the artificial light source 82, the light is accurately irradiated to the measurement point through the transmission optical system 80. And an optical focusing adjusting step of adjusting the divergence angle of the light by the variable focusing means shown in FIG. 5 to adjust the focus of the light to the measuring point when the distance between the main body 10 and the measuring point is measured in the above-described alignment step. You can do more.

When light is irradiated to the measuring point, the light is reflected by the reflector, and a light receiving step of receiving light from the receiving optical system 90 is performed. In addition, a measurement step of measuring the light received through the receiving optical system 90 in the spectrometer 140, and an analysis step of analyzing the pollutants by the computer 150 by automatically calculating the data transmitted from the spectrometer 140 is further Can be performed.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments.

Accordingly, the true scope of protection of the present invention should be determined only by the appended claims.

10: main body 30: rotary unit
40: mainframe 50: subframe
60: first pivot member 61: first engagement member
80: transmission optical system 82: artificial light source
90: receiving optical system 100: optical path alignment means
110: reflector 140: spectrometer
150: computer

Claims (5)

A main body provided with a transmission optical system for irradiating light to a point in the atmosphere, and a reception optical system for receiving the light reflected by the reflector;
Optical path alignment means provided in the main body to irradiate the spot with a laser to align the path of the light irradiated from the transmission optical system with the spot;
And a rotating unit rotating the main body in the vertical direction and the horizontal direction to adjust the irradiation direction of the laser.
The rotating unit may include a main frame installed below the main body portion, a subframe provided between the main frame and the main body portion, a first pivot member for rotating the support portion coupled to the lower portion of the main body portion in a vertical direction, and the sub frame. It is provided with a second rotating member for rotating the frame in the left and right directions,
Rotating shafts formed in parallel with the support portion are coupled to the lower surface of the support portion, and a support for rotatably supporting both ends of the rotating shaft is provided on the upper surface of the subframe.
The first rotating member may include a first engagement member coupled to one end of the rotation shaft, a second engagement member engaged with the first engagement member, and installed on an upper surface of the subframe and connected to the second engagement member. And a first driving member for rotating the second engagement member,
The second pivot member may include a rotation shaft member having an upper end fixed to a lower surface of the subframe and a lower end rotatably installed on an upper surface of the main frame, a third engagement member coupled to the rotation shaft member, and the third engagement member. And a fourth driving member engaged with the second driving member, and a second driving member installed on a lower surface of the subframe and connected to the fourth coupling member and rotating the fourth coupling member. The method of claim 1, wherein the optical path alignment means comprises a laser light emitting element provided in the main body portion, and a laser transmission optical unit for irradiating the laser generated by the laser light emitting element to the reflector, remote measurement of air pollutant Device. The optical lens according to claim 2, wherein the laser transmission optical unit is provided with a laser optical housing provided on the front surface of the main body, an optical shaping lens installed inside the laser optical housing to shape light generated from the laser light emitting element, and the optical shaping lens. And a focal lens for adjusting the divergence angle of the projected light from the air pollutant. delete delete
KR1020100068089A 2010-07-14 2010-07-14 Remote detecting apparatus and method for air pollution using differential optical abosrption spectroscopy KR101237514B1 (en)

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KR101487262B1 (en) 2014-03-04 2015-02-04 국방과학연구소 Device for air contamination detector and method thereof
KR20170017147A (en) 2015-08-05 2017-02-15 길마기술 주식회사 Directional control apparatus for differential optical absorption sepectroscopy detecting gases in air
KR101873924B1 (en) * 2017-09-14 2018-07-03 (주) 글로벌텔레콤 Cctv for sensing neighborhood information and method of determining thereof
KR101894798B1 (en) 2017-06-15 2018-09-04 서울과학기술대학교 산학협력단 A Light Transceiver for Pollutant Detection Telescope

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CN102707733B (en) * 2012-06-07 2014-07-23 中国华能集团清洁能源技术研究院有限公司 Reflector alignment detection device and working method thereof
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KR101487262B1 (en) 2014-03-04 2015-02-04 국방과학연구소 Device for air contamination detector and method thereof
KR20170017147A (en) 2015-08-05 2017-02-15 길마기술 주식회사 Directional control apparatus for differential optical absorption sepectroscopy detecting gases in air
KR101894798B1 (en) 2017-06-15 2018-09-04 서울과학기술대학교 산학협력단 A Light Transceiver for Pollutant Detection Telescope
KR101873924B1 (en) * 2017-09-14 2018-07-03 (주) 글로벌텔레콤 Cctv for sensing neighborhood information and method of determining thereof

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