KR101873924B1 - Cctv for sensing neighborhood information and method of determining thereof - Google Patents

Abstract

The present invention relates to a CCTV camera with a reliable fine dust concentration and visible distance measurement function by combining a humidity measurement value and a visibility measurement value and verifying validity of a fine dust measurement value in measuring concentration of fine dust in the atmosphere and a measurement method thereof. The CCTV camera comprises an image capturing unit, a housing, a laser beam transmission unit, an image analysis unit, a drive unit, a fine dust measuring unit, a humidity measuring unit, and a central processing unit.

Description

TECHNICAL FIELD [0001] The present invention relates to a CCTV camera having a fine dust concentration and a corrective distance measuring function,

The present invention relates to a CCTV camera having a fine dust concentration and a visibility measuring function, and more particularly, to a method for measuring a concentration of a fine dust by verifying the validity of a fine dust measurement value by integrating a humidity measurement value and a visibility measurement value, The present invention relates to a CCTV camera having a fine dust concentration and a correcting distance measuring function and a measuring method thereof.

There are various floating dusts having diameters of 0.1 to 100 탆 in the atmosphere. Among them, dusts having a diameter of 2.5 탆 or less are classified as fine dusts "PM2.5", and diameters of 2.5 袖 m to 10 袖 m are classified as fine dust And "PM10".

PM2.5 is known to penetrate deeply into the alveoli without being caught by the nasal mucosa when it is inhaled for a long period of time and is known to increase the early mortality rate together with asthma, allergic rhinitis, bronchitis, emphysema and alveolar damage. In the Ministry of Environment and local governments, In order to protect the micro dust, the fine dust measuring device is installed in a specific place to continuously detect the micro dust generation area, the generation time, and the concentration of the dust, and the related information In real time.

As the fine dust measurement method, filter paper method, beta-ray absorption method, micro balance method and the like are commonly used, and the filter paper method is a method of collecting the collected dust on the filter paper in the field and measuring the mass of the collected dust. And the measurement period is long and precise measurement is difficult.

The β-Ray Absorption Method is a method of continuously detecting the weight concentration of particulate matter by trapping particulate matter less than 10 μm floating in the air on a filter paper for a certain time and transmitting the β-ray. It is possible to measure the permeation rate of the Beta wire by irradiating the Beta wire to the air passing through the sample introduction part, and to measure it as the fine dust concentration value in real time. An example thereof is Korean Patent No. 10-1519974.

The micro balance method is a method to detect minute dust concentration by monitoring the change amount of fine dust while filtering the sample air with filter paper. Since the filter paper needs to be changed every time fine dust accumulates, it is possible to cope with the change of minute fine dust generation in a timely manner It is difficult and very expensive.

U.S. Patent No. 4391338, Japanese Patent Registration No. 3354217, and Korean Registered Patent No. 10-1646685 are known.

On the other hand, in the above-mentioned Patent No. 10-1519974, an image can be photographed and monitored through a CCTV camera which is rotated up and down and left and right, and an atmospheric inhalation pipe, And when the atmospheric component exceeds the set range, the CCTV camera for security surveillance can be visually monitored by rotating the CCTV camera to the contamination occurrence area.

Normally, not only fine dust but also very fine moisture particles (mist) are present in the atmosphere, and fine dust is precipitated or floated depending on the water content of the fine dust, which has a considerable influence on the visibility as well as the humidity.

Most of the substances that cause mobility impairment are PM2.5 or less (EURO-TRAII is described by IMPROVE (Integrated Monitoring Agency for Protection of Visibility Environment, NARSTO (North American Research Ozone) (Carbon element, fine soil particles) and the secondary products (ammonium sulfate, ammonium nitrate, organic matter), and the main components that affect the visibility of PM2.5 Another factor affecting visibility is the value not including ultrafine dust and gaseous substances below 1 μm).

According to the "correlation between fine dust and visibility" of the National Institute of Environmental Research in 2015, particles with a size of 0.5 μm have a large light scattering effect, which causes a decrease in visibility. , The visibility distance is worse when the humidity is high when the concentration of fine dust is high and the visibility distance is decreased by an average of 13.8% when the humidity is increased by 10% when the dust concentration is more than 80 μg / m ³ have.

Therefore, in view of the above report, there is a difference in measurement value depending on the measurement height and the water content of the fine dust when measuring the fine dust concentration, but the patent No. 10-1519974 which does not take this into consideration clearly trusts the fine dust measurement value There is a difficult and obvious problem.

The present invention is to provide a CCTV camera and a measuring method thereof that can be easily adopted in a general-purpose CCTV camera installed in a wide area, and can measure minute dust concentration and visibility in real time while maintaining the objective function of the CCTV camera.

Another object of the present invention is to provide a base on which an integrated air quality management system can be easily built while maintaining the essential function of a CCTV camera by easily installing or upgrading the present invention to a widely installed general CCTV camera, And to provide a CCTV camera that can comprehensively or selectively apply and utilize measurement information such as camera image information, humidity measurement value, fine dust measurement value, and corrective measurement value.

The means for implementing the CCTV camera with the fine dust concentration and the corrective distance measuring function according to the present invention,

A CCTV camera for security surveillance or traffic information collection,

A zoom lens assembly including a zoom lens capable of zooming, a zoom lens drive control unit for controlling whether the zoom lens is driven and an image sensor for converting photographed image information into an electrical signal,

A housing in which the image pickup unit is installed and fixed to an outdoor structure;

A laser beam transmitter including a laser beam transmitter fixed to the outdoor structure at a predetermined distance from the housing so as to transmit the laser beam toward the housing, and a beam transmission controller for controlling whether to irradiate the laser beam transmitter;

 A polarizing lens provided on the front surface of the zoom lens for selectively transmitting scattered light of the laser beam, an infrared band-pass filter for passing only the wavelength of the laser beam, and a laser beam An image analyzing unit for calculating a corrective measurement value by inserting the calculated amount of light into a corrective relation and transmitting the calculated value to a central processing unit;

A rotator driving unit coupled to the image capturing unit to rotate the image capturing unit vertically and horizontally, and a rotating device controller for controlling whether the rotating device is driven by a control of the central processing unit;

A fine dust measuring unit installed in the housing for calculating a fine dust measurement value by analyzing a magnitude of received light by irradiating a laser beam to the outside air while sucking the outside air and transmitting the measured value to a central processing unit;

 A humidity measuring unit attached to the outer wall of the housing to measure a humidity of the outdoor unit and transmit the humidity measurement value measured by the central processing unit to the central processing unit;

The micro-dust measurement value is compared with the fine dust reference value and the determination information is selectively transmitted to the transmission unit. If the fine dust measurement value is larger than the fine dust reference value, the control unit is controlled so that the image capturing unit rotates toward the laser beam transmitter After the image capturing unit is positioned, the laser beam transmitter is controlled to control the beam transmission control unit to emit the laser beam. The amount of scattered light of the beam transmitted through the polarizing lens and the infrared bandpass filter is compared with the corrective measurement value If the validity of the fine dust measurement value is determined to be valid, the fine dust measurement value and the corrected measured value are stored together with the date information and the humidity measurement value in the data storage unit And a central processing unit for transmitting the data to the transmitting unit at the same time.

The implementation means for implementing the fine dust and visibility measurement method using the CCTV camera according to the present invention includes:

When the measured value is larger than the reference value by comparing the fine dust measurement value with the reference value by the central processing unit, the validity of the fine dust measurement value is determined by synthesizing the measured value and the humidity measurement value. The information is stored in a data storage unit and transmitted to a remote site through a transmission unit at the same time, and when the validity is denied, the information is discarded.

In the present invention, the fine dust measurement value is compared with the fine dust reference value while maintaining the original function of the CCTV camera, and the validity of the fine dust measurement value is verified by integrating the measured value and the humidity measurement value again, It is possible to reliably increase the reliability of the value. Therefore, the present invention can provide a CCTV camera capable of measuring an inexpensive and reliable fine dust concentration and a corrective distance.

In addition, the present invention easily employs a widely installed general-purpose CCTV camera to easily construct an integrated air quality management system based on it, and furthermore, it can measure measurement information such as image information of camera, humidity measurement value, fine dust measurement value, The present invention can provide a base on which a comprehensive or selective application and utilization can be performed.

1 is a block diagram illustrating a detailed configuration of a CCTV camera having a function of measuring a fine dust density and a visibility distance according to the present invention.
2 is a flow chart showing the processing of the central processing unit according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a camera having a fine dust pollution degree measurement and a corrective measurement function according to the present invention will be described in detail with reference to FIG.

The CCTV camera 100 having the function of measuring the fine dust density and the corrective distance according to the present invention includes basic structures for realizing the original purpose required by the known general purpose CCTV camera.

(Hereinafter, referred to as " laser beam transmission section 111 "), a humidity sensor (hereinafter referred to as " humidity measurement section 102"), a laser beam transmitter (Hereinafter, referred to as "image capturing unit 121") for capturing a moving image, an image analyzing unit 122 for detecting a light amount of the laser beam from the image information captured by the image capturing unit 121, (Hereinafter, referred to as "data storage unit 104") for storing image information and measurement values of the above-described measurement units, A processor (hereinafter referred to as a " central processing unit 200 ") having control logic for programmatically comparing and determining measured values, a communication device for transmitting / receiving data and control signals to / 103 (hereinafter referred to as "housing 100a").

The housing 100a may be fixedly installed on a street, street lamp, overpass, steel tower, building, and various road structures (hereinafter referred to as "outdoor structure").

The fine dust measuring unit 101 is installed in the housing 100a. The detailed structure of the fine dust measuring unit 101 is similar to that described in Japanese Patent No. 10-1519974.

However, the fine dust measuring unit 101 of the present invention is characterized by simultaneously measuring and outputting PM 2.5 and PM 10.

The fine dust measurement value measured by the fine dust measurement unit 101 is transmitted to the central processing unit 200 described later in real time.

The humidity measuring unit 102 is attached to the outside of the housing 100a to measure the humidity in the air and the measured humidity measurement value is transmitted to the central processing unit 200 at the request of the central processing unit 200 do.

The laser beam transmission unit 111 includes a beam transmission control unit 112 for controlling whether a laser beam is scanned or not and a beam transmission unit 112 for scanning the laser beam toward the housing 100a side So as to be fixed to the outer structure adjacent to the housing 100a.

The width of the beam irradiated from the laser beam transmitting unit 111 is about 1 inch and is spaced apart from the housing 100a by about 1.5 m.

The beam transmission control unit 112 controls whether the laser beam transmission unit transmits a beam according to a control signal of the central processing unit 200.

The image capturing unit 121 is installed in the housing 100a and includes an automatic preset, an AUTOMATIC IRIS CONTROL, an image sensor, a zoom lens 124, a zoom lens zooming driver (Not shown), a control unit 125, a polarizing lens (not shown in the drawing), an infrared bandpass filter (not shown in the figure), a video photographing unit and a pen / tilt driving unit And a tilt control unit 126.

The zoom lens 124, the zoom lens controller 125, the polarizing lens, and the infrared band-pass filter described above are integrally formed in the lens assembly 123.

The zoom lens driving unit (not shown in the figure) physically actuates the zoom-in / out function of the zoom lens in order to enlarge image information. The image capturing unit pen / The pen / tilt controller 126 of the CCTV camera controls the photographing angle by rotating the angle of the image photographing unit 121 up and down and right and left. The pen / Refers to a circuit control device for electrically controlling the operation of the pen / tilt driver 122 described above.

When the image capturing unit 121 is rotated to the left or to the right under the control of the pen / tilt controller 126 and is aligned with the laser beam transmission unit 111, the pen / tilt driver 122 A sensing signal of a position sensing sensor (not shown in the figure) is transmitted to the central processing unit 200 and is maintained in a fixed state for a preset time by the image sensing unit 121 in a programmed manner.

The above-described polarizing lens is an optical filter installed between the zoom lens and the image sensor and capable of selectively transmitting scattered light of the laser beam irradiated from the laser beam transmitting unit 111.

In addition, the infrared band-pass filter passes only the wavelength band of the laser beam and blocks the wavelengths of the other upper and lower bands, so that the image sensor can effectively receive the forward scattered light of the laser beam.

The image analyzer 130 detects the scattered light amount of the beam in the image information (screen) transmitted through the polarizing lens (not shown in the drawings) and the infrared bandpass filter, and substitutes the detected value into the correction calculation formula And transmits the calculated corrected measured value to the central processing unit 200. [0034]

The data storage unit 104 is a semiconductor memory that stores measurement values and date information of each of the measurement units.

The transmission unit transmits various data and control signals between the central processing unit 200 and the external network. Means a communication device to receive, and has a unique IP.

At the same time, the central processing unit 200 compares the fine dust measurement value with the fine dust reference value by the control logic of the program, and determines the zoom lens control unit 125, the pen / The microcomputer 126 controls the beam transmission control unit to selectively control the fine dust measurement value by verifying the validity of the fine dust measurement value by integrating the humidity measurement value and the corrective measurement value, And stores it in the storage unit 104 and transfers it to the transfer unit 103 at the same time.

The housing 100a is fixed to an outdoor fixture. The housing 100a includes a fixing part (not shown in the figure) and a rotation part (not shown in the figure) The measuring section 102 is provided, and the rotary section is rotatably coupled with the stationary section, and the above-described image pickup section 121 is installed therein.

The rotation unit may be a hemispherical shape having a transparent window on an outer surface thereof, and the image capturing unit 121 may capture an image through the transparent window.

Hereinafter, the measuring method of each measuring unit described above will be described.

The detailed structure and measurement method of the fine dust measuring unit 101 are described in detail in a well-known Japanese Patent Registration No. 10-1519974, and a detailed description thereof will be omitted.

However, as described above, PM2.5 and PM10 are measured and output simultaneously.

The humidity measuring unit 102 may be any digital humidity measuring sensor including an atmospheric humidity measuring range.

The time-lapse measurement values may be derived by the laser beam transmission unit 111 and the image analysis unit 130.

When the laser beam is irradiated from the laser beam transmission unit 111, the irradiation direction is irradiated (inclined) at a predetermined angle without irradiating the laser beam to the front face of the thermal imaging unit.

In this way, when the image capturing unit 121 enlarges the region irradiated with the laser beam, only the axial region of the scattered light can be partially photographed.

Therefore, the scattered light photographed appears in a vertical direction at the center of the image information. The light intensity of the beam is detected by the image analyzer 130 in the image information, and the reflected light is substituted into the calculation formula described later. . The derived corrective measurement value is transmitted to the central processing unit 200.

In this case, the wavelength of the laser beam is separated from the visible light and is within the measurement range of the image sensor of the camera, and it is preferable to determine the range in which scattered light of a particle having a maximum diameter can be obtained.

In this way, as described above, the output of the scattered light can be maximized and the accuracy of the image analysis can be increased, and no errors are caused in the analysis of the image frame.

Preferably, the wavelength of the laser is in a range of 850 to 905 nm, and the transmission pulse period of the laser beam is set to 1/3 times the frame or field period of the camera. This ensures that at least one of the three frames or fields of the camera is within the transmit pulse period of the laser beam, so that the detection of the scattered light of the complete laser beam is certain.

The correction value calculation method has been described above, but will be described in more detail below.

The central processing unit 200 determines whether the fine dust measurement value is an abnormality by comparing the fine dust measurement value with the fine dust reference value. The fine dust reference value is determined by the environment department And is programmed into the control logic of the central processing unit 200 based on four steps.

Table 1 summarizes the concentration of fine dust and step-by-step action points set by the Ministry of Environment.

 division Fine dust concentration value (占 퐂 / m3)  Action Tips PM2.5 PM10 good  0 to 15 0 to 30 - usually  16 to 50 31 ~ 80 -        Poor Poor

51-100  81-120 Long-term outdoor activities of older people Poor  121 ~ 200 Request for restrained extreme outdoor activities (especially respiratory, cardiovascular, and elderly), avoiding excessive outdoor activities for a long time Very bad  101 to 500  151 ~ 600 Restricting outdoor activities, restricting outdoor activities danger  301 ~ 301 ~ Limited to Indoor Activities

The central processing unit 200 determines that the values of PM2.5 and PM10 measured by the fine dust measuring unit 101 satisfy PM10 > PM2.5 and that the measured value is within the reference value range and the humidity is within 75% In this case, the fine dust sensing value is continuously received and compared with the fine dust reference value (see FIG. 2 (a)).

When the humidity is more than 75%, the inorganic salt (nitrate, sulfate) among the constituents of the fine dust particles tends to precipitate due to the binding with moisture, so that the measurement value of the fine dust tends to be drastically lowered. The data is allowed as data using only a general data validity determination method.

On the contrary, when the humidity is 75% or less and the fine dust measurement value is out of the reference value range, the central processing unit 200 controls the pen / tilt control unit 126 to turn the laser beam transmission unit 111 When the operation of the pen / tilt driver 122 is stopped through the pen / tilt controller 126 by the sensing signal of the position sensor and the image capturing unit 121 rotates the image capturing unit 121, And is fixed to face the portion 111 (see Fig. 2 (b)).

Thereafter, the central processing unit 200 controls the zoom lens driving unit to zoom in so that the zoom lens can take an enlarged image, and at the same time controls the beam transmission control unit to control the laser beam transmission unit 111 to irradiate the laser beam (See Fig. 2 (c)).

The reason for enlarging the zoom lens at this time is that the image analyzing unit 130 can more easily and more accurately detect the amount of scattered light in the image information (background screen) by enlarging and photographing the scattered light region of the laser beam.

The scattered light region is transmitted through the polarizing lens and the infrared bandpass filter, converted into an electric signal by the image sensor, and transmitted to the image analysis unit 130.

The image analyzing unit 130 detects the value of the scattered light, substitutes the detected value into the calculation formula to calculate the corrected distance value, and transmits the calculated value to the central processing unit 200 (see FIG. 2 (d)).

At this time, it is preferable to keep the F value of the diaphragm at a constant value so that the light amount change due to the fluctuation of the diaphragm does not occur at every measurement. The value of the acid light intensity can be calculated by the following equation.

Lv = Visibility = 3. 912 / bext ---------------- Equation (1) [Koschmieder's visibility theory]

Ix = Io exp (-bext x) - (2) [Theory of Beer]

[Explanation of formula]

bext: extinction coefficient

Io: intensity of the light source

Ix: intensity of light after traveling through the optical path

x: Path distance of light

The extinction coefficient is related to the intensity of light as it travels through the atmospheric path x [m].

Therefore, the extinction coefficient and the visibility can be measured by knowing the light intensity Io of the light source and measuring the light intensity Ix after the path x [m].

In general, non-scattering occurs when the particle size is similar to the wavelength of light and reacts to the density, size and shape of the particles. Non-scattering is almost independent of wavelength, and this is where water vapor, ice pellets, soot, etc. collide with light. Non-scattering is pronounced in forward scattering, and relatively small energy is scattered backward.

The central processing unit 200 converts the fine dust measurement value and the humidity measurement value into a conversion program (visually converted value) and compares the fine dust measurement value and the humidity measurement value with the corrected distance value to determine the validity of the fine dust measurement value e).

If the validity of the fine dust measurement value is determined in the central processing unit 200, the data (fine dust measurement value, corrective measurement value, humidity measurement value, measurement time) is stored in the storage unit and transmitted to the transmission unit, Ignore (discard) if validity is denied.

Hereinafter, the process of the central processing unit in the fine dust measurement according to the present invention will be described.

In addition to the above-mentioned equations (1) and (2), there are the following relational expressions.

Lv [km] = A.10 ³ / C --------------------------------------- -------- Equation (3)

   A: Experimental constant, usually 1.2 (0.6 to 2.4)

C: Concentration of particulate matter [ug / m ³ ]

   Condition: Relative humidity 70%

As another method of calculating the correcting distance based on the other dispersion area ratio K

Vm [m] = 5.2 pr / KC ----------------------------------------- --- (4)

Condition: - Applied when the wavelength is 5240 Å

           - Light extinguishing depends only on dispersion

           - All spherical uniform distribution

           - Particulate matter concentration / 70% relative humidity / horizontal lighting schedule

  Vm: Visibility distance [m]

P: Density of dust [g / cm ³ ]

  r: the radius of the dust

  K: dispersion area ratio (for example, 4.1)

C: Concentration of dust [g / m ³ ]

As another method of calculating the distance, chemical components that cause mobility impairment are classified into primary and secondary air pollutants according to the generation process.

The primary air pollutants are elemental carbon, fine soil particles and NO2 gas, and the secondary air pollutants are ammonium sulfate, ammonium nitrate, and organic matter.

In the results of the IMPROVE institute, the chemical composition was calculated by dividing the particles causing the visibility disorder into fine particles of less than 2.5 μm and coarse particles of less than 10 μm depending on the particle sizes.

In the present invention, IMPROVE (1998), INS95 (1996) and Kim et al. (1998) have been proposed in the National Institute of Environmental Research (2013), a study on the visibility characteristics for improving indoor air pollution degree and the National Academy of Sciences (2001), and the relationship between chemical composition and chemical composition was calculated as follows.

bext = 0.91 x (3xNHSOx (1 -RH / 100) -0.7) + 1.34x (3xNHNOx (1-RH / 100) -0.7) + 1.06x (4xOMCx (1-RH / 100) -0.4) + 0.98x ( 10xEC) + 1x (2xFS) + 1x (0.6xCM) + 153.53 ----------------------------------- ----------------------------------- Equation (5)

Table 2 shows the compositional relationship of aerosol compounds.

** bext: extinction coefficient

   NHSO: ammonium sulfate

   NHNO: Ammonium nitrate

   OMC: Organic material

   FS: fine soil

   CM: Coarse particles

   EC: elemental carbon

The extinction coefficient of Equation (5) is substituted into Equation (1), the Koschmieder's equation, to calculate the corrective distance.

As another method of calculating the correcting distance

PM10 = 1023 exp (-0.17 VIS) ---------------------------------------- Expression 6)

VIS = 5.882 In (1023 / PM10) --------------------------------------- Expression 7)

The above equation is a relational expression of the paper of the Korean Meteorological Society (2012, Atmospheric Vol. 22, No. 1, A Study on Estimation of Fine Dust Concentration in Yellow Sand Using Visible Data).

The relationship between municipalities and PM10 in the meteorological data of 2005 ~ 2010 is derived by conversion formula.

It is not applicable at more than 1023 ㎍ / ㎥, but it can be used as a routine comparative conversion equation.

As another method for calculating the correcting distance,

[Seoul city area correction formula]

VIS = 893 / (bext - 75) ---------------------------------------- (8)

[Baekryeongdo area correction formula]

VIS = 509 / (bext - 87) ---------------------------------------- (9)

The above equations (8) and (9) show the light scattering coefficient and the absorption coefficient of 2012 and the visibility data of the mock by the National Institute of Environmental Research (2013, Study on the characterization and generation process of fine dust- Is a visibility relation derived from the above.

Equations (1) and (2) are applied mainly to optical scattering measurement, and Equation (3) and Equation (5) are applied when converting the values of fine dust concentration or each component in fine dust into visibility distance . Also, Equations (6) and (7) can convert the corrected value of the corrected distance of the visual system or the corrected value of the visibility system into the fine dust value, and convert the fine dust concentration value into the visibility distance value.

Equations (8) and (9) can be transformed by substituting the extinction coefficient, which is the result of Eq.

[Example]

Fine dust sensor Measured value: PM2.5 = 83 / / m3, PM10 = 125 / / m3

Measured value: 6km

Humidity value: 60%

Comparison table stored value: see Table 3

PM2.5 / PM10 ratio PM10 PM2.5 NHSO NHNO OMC EC FS RCM 0.66 120 80 27.2 24.7 11.2 3.0 25.6 106 25.66% 23.3% 10.57% 2.83% 24.15%

[Step 1]

Compares the value of PM2.5 above the reference (usually less than 50 ㎍ / ㎥).

If the PM2.5 / PM10 ratio is 0.3 or less, calculate the corrective distance using the value of PM10 because it is yellow dust (apply equation (7)). If PM2.5 / PM10 ratio is 0.3 or more and 0.7 or less, PM2.5 or PM10 mixed application, application of formula "formula (5)",

If the ratio of PM2.5 / PM10 is 0.7 or more, it is calculated as the value of PM2.5 because it is long-distance haze and city haze (apply formula (5) or (8) or (9)

[Step 2]

If it is above the upper limit, the table of approximate value of the fine dust sensor measurement value is found and converted into a value to be applied.

PM2.5 / PM10 ratio PM10 PM2.5 NHSO NHNO OMC EC FS RCM 0.66 125 83 28.22 25.63 11.62 3.11 26.56 110 1.0375 25.66% 23.3% 10.57% 2.83% 24.15%

[Step 3]

The value of [step 2] is substituted into equation (5) to calculate extinction coefficient.

bext = 0.91 x (3xNHSOx (1 -RH / 100) -0.7) + 1.34x (3xNHNOx (1-RH / 100) - 0.7) + 1.06x (4xOMCx (1-RH / 100) -0.4) + 0.98x ( 3x28.22x (1-60 / 100) ^-0.7 ) + 1.34x (3x25.63x (1-60 / 100) ^-0.7 ) + 1x (2xFS) + 1x (0.6xCM) + 153.53 = 0.91 x 1.06x (4x11.62x (1-60 / 100) ^-0.4 ) + 0.98x (10x3.11) + 1x (2x26.56) + 1x (0.6x42) + 153.53 = 146.3 + 195.7 + 71.1 + 25.2 = 521.9 Mm ^-1 = 0.5219 km ^-1

[Step 4]

If the value of [step 3] is substituted into equation (1)

Lv [km] = 3.912 / bext [km ^-1 ] = 3.912 / 0.5219 [km ^-1 ] = 7.5 km

[Step 5]

If the value of [Step 4] falls within the range of ± 30% of the measured value, it is accepted as normal data.

-30% = 4.2km <7.5km <+ 30% = 7.8km, which is acceptable as normal data.

The corrected distance value can be obtained by selectively adopting the above-described corrected distance calculation method.

As described above, the present invention can simultaneously measure PM2.5 fine particle mass concentration and visibility in real time, verifying mutual measurement values, and thus can apply and utilize reliable measurement information in various ways. Function, it can be easily adopted because it can be upgraded or replaced with the general CCTV camera installed.

Therefore, this will be useful for producing PM2.5 fine dust discharge sites and fine dust maps through widely installed CCTV cameras.

100: CCTV camera 100a: camera housing
101: Fine dust measuring unit 102: Humidity measuring unit
103: Transmission unit 104: Data storage unit
110: laser transmitting device 111: laser beam transmitting part
121: image capturing unit 122: pen / tilt driver
123: lens assembly 124: zoom lens
125: zoom lens control unit 126: pen / tilt control unit
130: Image analysis unit 200: Central processing unit

Claims (8)

A CCTV camera for security surveillance or traffic information collection,
A zoom lens driving control section for controlling whether the zoom lens is driven; and an image sensor for converting the photographed image information into an electrical signal, wherein the scattered light of the laser beam is photographed, A zoom lens assembly for fixing a diaphragm and zooming in the zoom lens to the maximum to photograph the scattered light of the beam;
A housing in which the image pickup unit is installed and fixed to an outdoor structure;
The wavelength of the laser beam is 850 to 905 nm. The transmission pulse period is irradiated with a laser beam at 1/3 times of the frame period or the field period of the camera, so that the laser beam can be transmitted toward the housing. A laser beam transmitter having a laser beam transmitter and a beam transmission controller for controlling whether the laser beam transmitter is driven;
A polarizing lens and an infrared band-pass filter provided on the front surface of the zoom lens for selectively transmitting the laser beam, and an image analyzing unit for analyzing the light amount of the laser beam from the image information transmitted through the polarizing lens and the infrared band- An image analysis unit for calculating a corrected measurement value and transmitting the calculated corrected measurement value to a central processing unit;
A rotation unit coupled to the image capturing unit to rotate the image capturing unit vertically and horizontally, and a rotation unit controller for controlling whether the rotation unit is driven by the control of the central processing unit, and a driving unit installed in the housing;
A fine dust measuring unit installed in the housing for calculating a fine dust measurement value and transmitting the measured value to a central processing unit;
A humidity measuring unit attached to the outer wall of the housing to measure a humidity of the outside of the housing and transmit a measured humidity value to a central processing unit when requested by the central processing unit;
The method of claim 1 or 2, wherein the fine dust measurement value is compared with a fine dust reference value while photographing the surveillance region through the CCTV camera, and the judgment information is selectively transmitted to the transmission unit. When the fine dust measurement value is larger than the reference value, And controls the beam transmission control unit to emit a laser beam from the laser beam transmitter. The laser beam is received by the controller, and the beam is transmitted through the polarizing lens, the infrared bandpass filter, and the zoom lens, The micro-dust measurement value and the visibility measurement value are determined based on the calculated visibility measurement value and the humidity measurement value by analyzing the scattered light amount of the beam through the image analysis unit, Value is stored in the data storage unit and transmitted to the transmission unit at the same time as the date information and the humidity measurement value, And a central processing unit for controlling the rotating device control unit to control the image capturing unit to photograph the monitoring target area again if the validity is not available. delete delete delete delete delete delete delete

Images