CN114720381A - Trace ozone concentration measuring device - Google Patents

Abstract

The invention belongs to the field of measuring environmental ozone concentration by a chemiluminescence method, and particularly relates to a trace ozone concentration measuring device. The shape of the detachable thermostatic chamber is a cuboid box, the long axis of the ellipsoid light-emitting chamber is along the long edge direction of the cuboid box, the long edge of the cuboid box is larger than 2 times of the long axis of the ellipsoid light-emitting chamber, the two short edges of the cuboid box are the same in length, and the short edge of the cuboid box is larger than 2 times of the short axis of the ellipsoid light-emitting chamber; the temperature inside the detachable thermostatic chamber is in a temperature section suitable for the fluorescence generation of excited NO 2; the invention has the advantages that the detachable ellipsoid light-emitting chamber is arranged in the thermostatic chamber, the optimal temperature of chemiluminescence is kept by utilizing the optical characteristic of total internal reflection of the ellipsoid and the constant temperature characteristic of the thermostatic chamber, the ozone detection limit is improved, and the utilization rate of fluorescence light exceeds 90 percent.

Description

Trace ozone concentration measuring device

Technical Field

The invention belongs to the field of measuring environmental ozone concentration by a chemiluminescence method, and particularly relates to a trace ozone concentration measuring device.

Background

The term "ozone pollution" as used in the present specification means photochemical smog. The essence of photochemical smog is that primary pollutants such as nitrogen oxides, hydrocarbons and the like discharged into the atmosphere from pollution sources such as automobiles, factories and the like undergo a photochemical reaction under the irradiation of solar ultraviolet rays to generate secondary pollutants such as ozone and the like. Ozone is highly irritating, primarily by irritating and damaging the deep respiratory tract, and can damage the central nervous system, with mild irritation to the eyes. Ozone concentration measurement generally requires the entry of expensive ultraviolet measurement instruments. The measurement of trace ozone concentration by chemiluminescence is a recent research result. The principle of measuring trace ozone by a chemiluminescence method is as follows: NO standard gas and gas containing O3 are oppositely introduced into the reaction chamber, O3 reacts with NO to generate excited NO2 molecules, and NO2 molecules cannot exist stably, can be rapidly attenuated to ground NO2, the time is less than 1 nanosecond, fluorescence with the central wavelength of 1200nm is radiated, the light emitting direction is random, and the spectrum range is 600-3000 nm. Under the condition of excessive standard gas NO, the O3 complete depletion reaction can be approximately considered, and the measured fluorescence intensity is in direct proportion to the concentration of O3, so that the trace ozone in the environment can be accurately measured. The fluorescence signal is weak, the light decay is fast, only 100 mm can be transmitted, and the observation is difficult. The optical characteristics of the ellipsoidal chemiluminescent reaction chamber are as follows: the ellipsoid has two focuses, and the light from one focus is reflected by the inner cavity surface of the ellipsoid and converged to the other focus. The idea is as follows: 1. setting the long axis of the ellipsoid light-emitting chamber as an x axis, cutting the long axis from the original point vertical plane of the long axis of the ellipsoid light-emitting chamber to form a left ellipsoid light-emitting chamber and a right ellipsoid light-emitting chamber, conveniently installing internal devices, equidistantly distributing six flange lugs on the outer edges of the left ellipsoid light-emitting chamber and the right ellipsoid light-emitting chamber, arranging a threaded through hole in the middle of the flange lugs, folding the left ellipsoid light-emitting chamber and the right ellipsoid light-emitting chamber by using bolts to form a complete light-shielding sealed ellipsoid light-emitting chamber, and meeting the intra-cavity reflection condition; 2. the left semi-ellipsoid light-emitting chamber and the right semi-ellipsoid light-emitting chamber are made of cast aluminum, and ozone gas is a strong corrosive medium, so that the polished aluminum film in the ellipsoid light-emitting chambers can reflect light and resist strong corrosion of the ozone gas. 3. A quartz glass lens is added between the left and right ellipsoidal luminous chambers, and after the left and right ellipsoidal luminous chambers are folded through six flange lugs, threaded through holes and bolts of the left and right ellipsoidal luminous chambers, the quartz glass lens divides the ellipsoidal luminous chamber into two halves, a sealed semi-ellipsoidal reaction gas chamber is arranged in the left semi-ellipsoidal luminous chamber, and a sealed optical receiving chamber is arranged in the right semi-ellipsoidal luminous chamber; and the quartz glass lens in the middle of the ellipsoid is completely transparent to chemiluminescence, and still meets the optical reflection rule in the ellipsoid cavity. 4. An environment sample gas (containing ozone) input pipeline and a standard gas input pipeline are oppositely arranged on the left focal plane ellipsoidal light-emitting chamber of the left semi-ellipsoidal light-emitting chamber, and a chemical light-emitting point, which is a junction point of NO gas of the environment sample gas (containing ozone) input pipeline and the standard gas input pipeline, is a left focus of the left semi-ellipsoidal light-emitting chamber to form a chemical light-emitting chamber; an exhaust pipeline is arranged on the position of the long axis of the left ellipsoid light-emitting chamber, which corresponds to the ellipsoid light-emitting chamber, so that waste gas after reaction is discharged in real time; 5. the chemiluminescence point is at the left focus of the ellipsoid, any one of the left focuses emits light, and the light is directly reflected or reflected by a certain point in the ellipsoid light-emitting chamber and converged at the right focus of the ellipsoid to form a light-emitting reflection optical path; all the light-emitting reflection optical paths in the ellipsoids are constantly equal to 2c and are converged at the right focus of the ellipsoid; 6. a photomultiplier is arranged on the right focal plane of the ellipsoid light-emitting chamber, and a light absorption window of the photomultiplier is arranged at the right focus of the ellipsoid to receive the fluorescence in all directions in the ellipsoid to the maximum extent. 7. In order to eliminate the influence of the ambient temperature on chemiluminescence, the ellipsoid is integrally arranged in the thermostatic chamber. The heat capacity of the ellipsoid is large, so that the temperature drop caused by input gas can be counteracted; the temperature inside the ellipsoid is controlled to be constant by the MCU microprocessor, and the temperature in the reaction chamber is in the optimal chemiluminescence interval. 8. The MCU microprocessor starts the sampling air pump and the flow of the sample gas, the standard gas pressure reducing switch and the standard gas flow at regular time, the flow ratio is 1/10, and the ozone is ensured to be completely converted into an excited state NO2 to emit light. 9. And the MCU microprocessor receives the electric quantity signal of the photomultiplier, converts the electric quantity signal into an ozone concentration signal, and displays and uploads the ozone concentration signal to the upper computer.

Disclosure of Invention

The invention aims to provide a measuring device for measuring the concentration of ozone gas by a chemical fluorescence method.

The technical scheme of the invention is as follows: a trace ozone concentration measuring device is characterized in that a detachable ellipsoid light-emitting chamber of the ozone concentration measuring device is arranged inside a detachable thermostatic chamber (10);

as shown in fig. 1, the shape of the detachable thermostatic chamber (10) is a rectangular box (101), the long axis of the ellipsoid light-emitting chamber is along the long side direction of the rectangular box (101), the long side of the rectangular box (101) is larger than 2 times of the long axis of the ellipsoid light-emitting chamber, the lengths of two short sides of the rectangular box (101) are the same, and the length of the short side of the rectangular box (101) is larger than 2 times of the short axis of the ellipsoid light-emitting chamber; fixed screw seats (104) are arranged at four corners of the rectangular box (101), an upper cover and a lower cover of the rectangular box (101) are movable covers, and the upper cover and the lower cover are fixed by screws at the four corners; the heating rod (102) and the temperature sensor (103) are further arranged inside the rectangular box (101), the heating rod (102) and the temperature sensor (103) are electrically connected with the MCU microprocessor (11), the MCU microprocessor (11) controls the constant temperature inside the detachable thermostatic chamber (10), and the preferable temperature inside the detachable thermostatic chamber (10) is in a temperature section suitable for generation of fluorescence of excited state NO 2; the preferred 2-fold long axis of the ellipsoid is less than or equal to 100 mm of the fluorescence propagation distance;

as shown in fig. 2, the detachable ellipsoidal light-emitting chamber comprises a left ellipsoidal shell (1), six flange lug bottoms (4) outside the left and right ellipsoidal shells, a quartz glass lens (5), a right ellipsoidal shell (7), and six flange lug tops (8) outside the left and right ellipsoidal shells; the left ellipsoidal spherical shell (1) and the right ellipsoidal spherical shell (7) adopt cast aluminum ellipsoidal shells, and the interiors of the cast aluminum ellipsoidal shells are polished; as shown in fig. 2, a quartz glass lens (5) is added between a left ellipsoidal shell (1) and a right ellipsoidal shell (7), the left ellipsoidal shell (1) and the right ellipsoidal shell (7) are mechanically connected through six flange lugs (4) and six flange lugs (7) which are arranged outside and threaded through-hole bolts, and the left ellipsoidal shell (1) and the right ellipsoidal shell (7) are folded to form a detachable ellipsoidal light-emitting chamber; further, as shown in fig. 2, the left ellipsoidal shell (1) and the quartz glass lens (5) form a sealed luminescence reaction chamber; on the cross section of a focal plane x = -c of the left ellipsoidal light-emitting chamber, from a horizontal line of a overfocus point on the cross section, a hole which can be sealed oppositely is arranged along the clockwise direction, a standard gas input pipeline (3) and an environment sample gas input pipeline (9) are sequentially arranged, and the environment sample gas input pipeline (9) and the standard gas input pipeline (3) are arranged on the diameter of the overfocus point; a closable hole is formed in the long shaft of the left ellipsoidal luminous chamber, and an exhaust pipeline (2) is installed at the closable hole;

furthermore, an environment sample gas input pipeline (9) and a standard gas input pipeline (3) which are oppositely arranged on a focal plane x = -f of the left ellipsoidal shell (1) are oppositely arranged around the focus of the ellipsoidal shell, the intersection point of ozone and NO of two gases is at the focus of the left ellipsoidal shell, the NO gas wraps ozone gas, an exhaust pipeline is on the long axis of the left ellipsoidal shell, and the two gases are intersected, mixed and excited to emit chemiluminescence at the focus of the left ellipsoidal shell;

a quartz glass lens (5) and a right ellipsoidal spherical shell (7) form a closed photoelectric conversion chamber, a hole is formed in the right ellipsoidal spherical shell (7) along the focal plane x = f of an ellipsoidal light-emitting chamber, a photomultiplier (6) is installed, and an optical window of the photomultiplier (6) is positioned on the focal point of the right ellipsoidal spherical shell; chemiluminescence of the focus of the left ellipsoidal spherical shell (1), direct incidence or internal reflection of the ellipsoidal spherical shell, and optical connection of a quartz glass lens (5) between the left ellipsoidal spherical shell (1) and the right ellipsoidal spherical shell (7) with an optical window of a photomultiplier (6) of the focus of the right ellipsoidal spherical shell (7);

further, an exhaust pipeline (2), a standard gas pipeline (3) and an environment sample gas input pipeline (9) penetrate through the left wall of the detachable thermostatic chamber (10), wherein the environment sample gas input pipeline (9) is connected with the inlet end of a sample gas flowmeter (91) through a pipeline, the outlet end of the sample gas flowmeter (91) is connected with the gas outlet end of a peristaltic sampling pump (92) through a pipeline, and the gas inlet end of the peristaltic sampling pump (92) is connected with a sampling port (93) with a particle filtering device; the standard gas input pipeline (3) is connected with the inlet end of a standard gas flowmeter (31) through a pipeline, the outlet end of the standard gas flowmeter (31) is connected with a standard gas pressure reducing valve (32) through a pipeline, and the standard gas pressure reducing valve (32) is connected with a standard gas source (33); the exhaust pipeline (2) is connected with a one-way valve (22) through a pipeline, the one-way valve (22) is connected with an exhaust gas outlet (20), and the one-way valve (22) only allows one-way ventilation;

as shown in fig. 3, the air-marking pressure reducing valve (32), the peristaltic sampling pump (92), the heating rod (102), the temperature sensor (103) and the photomultiplier (6) are electrically connected with the MCU microprocessor (11), and the MCU microprocessor (11) is electrically connected with the display screen (12); the MCU microprocessor (11) receives the electric quantity signal of the photomultiplier, converts the electric quantity signal into an ozone concentration signal, displays the ozone concentration and uploads the ozone concentration signal to an upper computer.

The working principle of the trace ozone concentration measuring device is briefly described as follows: optical characteristics inside the ellipsoid: the light emitted from one focus is reflected by the inner surface of the ellipsoid, and the light rays are converged on the other focus. From the optical characteristics of an ellipsoid, the good chemiluminescence reaction chamber of the ellipsoid luminescence chamber is deduced. The detachable ellipsoidal luminous reaction chamber is cut by a vertical plane from a position where the long axis x =0 and is respectively a left half cast aluminum ellipsoidal spherical shell and a right half cast aluminum ellipsoidal spherical shell; sealing gaskets are added between the sections of the left and right ellipsoidal luminous chambers, the left and right half-cast aluminum ellipsoidal spherical shells are mechanically connected through six flange lugs and threaded through-hole bolts at the outer edges, and the left and right ellipsoidal luminous chambers are folded to form an airtight shading left half-ellipsoidal luminous reaction chamber; the interiors of the cavities of the left and right ellipsoidal light-emitting chambers are polished, so that fluorescence reflection is facilitated; in order to eliminate the influence of the ambient temperature on chemiluminescence, an ellipsoidal light emitting chamber is arranged inside a thermostatic chamber, and the temperature is controlled to be constant at 50 ℃ by an MCU (11).

The MCU microprocessor (11) controls the sampling air pump, the sample gas flowmeter, the standard gas pressure reducing switch and the standard gas flowmeter to ensure that ozone is completely converted into excited NO to emit light; at a proper temperature of 50 ℃, a left focal plane in the ellipsoidal spherical reaction chamber, an environment sample gas (containing ozone) input pipeline are thin, a standard gas input pipeline is thick, a junction point of the two gases is near the left focus of the ellipsoid, and NO wraps O3 gas; NO reacts with O3 to generate excited NO2 molecules, NO2 molecules cannot exist stably, the NO rapidly attenuates to ground NO2, the time is less than 1 nanosecond, fluorescence with the central wavelength of 1200nm is radiated, the spectral range of the fluorescence is 600-3000 nm, and the light-emitting point is near the focus; the quartz glass lens is selected to pass all fluorescence of 600-3000 nm. The exhaust pipeline is perpendicular to the connecting line of the environment sample gas (containing ozone) input pipeline and the standard gas input pipeline, the exhaust pipeline points to a focus along the long axis direction, the two gases are converged and then exhausted from the exhaust pipeline through a one-way valve and an exhaust port, and the gas luminous band is at the focus of the left ellipsoid; the total luminous reaction of O3 gas is ensured by adjusting the pipe diameters, the distances between pipes and the flow rates of an environment sample gas (containing ozone) input pipeline and a standard gas input pipeline; the gas mixing process is basically performed on the left cast aluminum ellipsoid focal plane, and the light-emitting surface is performed on the left cast aluminum ellipsoid focal plane; the luminous point of the left focus of the ellipsoid is directly projected or reflected by the polished aluminum film of the ellipsoid luminous chambers at the periphery and is focused at the other focus of the ellipsoid. All the light is reflected by the inner part of the ellipsoidal spherical shell and passes through the quartz glass lens between the light and the ellipsoidal spherical shell to reach the right focus of the ellipsoid; the photomultiplier tube mounted at the right focus of the ellipsoid receives all of the light emission. The light emitted by the left focal plane of the left focus of the ellipsoid is reflected by the ellipsoid, passes through the quartz glass lens and is optically connected with the photomultiplier; the photomultiplier tube converts the fluorescence intensity into a voltage signal, the light intensity is in direct proportion to the voltage, and the voltage signal is the concentration signal of the ozone. The MCU microprocessor (11) receives the electric quantity signal of the photomultiplier, converts the electric quantity signal into an ozone concentration signal, displays the ozone concentration and uploads the ozone concentration signal to an upper computer.

The invention has the beneficial effects that the ellipsoidal luminous chamber is arranged in the thermostatic chamber, the optimal temperature of chemiluminescence is kept by utilizing the internal total reflection optical characteristics of the ellipsoidal luminous chamber and the thermostatic temperature characteristics of the thermostatic chamber, the flow meters of the environmental sample gas input pipeline and the standard gas input pipeline are controlled, and the center of the mixture of O3 gas and NO gas is ensured to be at the left focus of the ellipsoidal inner cavity; all the focal plane luminescence is reflected in the inner cavity of the cast aluminum ellipsoid and is concentrated to the right focus of the inner cavity of the ellipsoid, passes through the quartz glass lens in the middle of the ellipsoid and is concentrated to the photomultiplier window of the other focus, so that the ozone detection limit is improved, and the light utilization rate exceeds 90%. The detachable constant temperature chamber is arranged, so that the ellipsoid cavity can be conveniently and periodically checked and maintained, and the quartz glass lens is scrubbed.

Drawings

FIG. 1 is a schematic view of the overall structure of a trace ozone concentration measuring device

FIG. 2 is a cross-sectional view of an ellipsoidal light-emitting chamber of a trace ozone concentration measuring device

FIG. 3 is a block diagram showing the circuit connection of a trace ozone concentration measuring device.

In the figure, 1, a left ellipsoidal shell, 2, an exhaust pipeline, 3, a standard gas input pipeline, 4, below six flange lugs outside the left and right ellipsoidal shells, 5, a quartz glass lens, 6, a shading photomultiplier, 7, a right ellipsoidal shell, 8, above six flange lugs outside the left and right ellipsoidal shells, 9, an environment sample gas input pipeline, 10, a detachable thermostatic chamber, 11, an MCU microprocessor, 12, a display screen, 20, an exhaust port, 22, a one-way valve, 31, a standard gas flowmeter, 32, a standard gas pressure reducing valve, 91, a sampling flowmeter, 92, a sampling peristaltic pump, 93, a sampling port with a particle filtering device, 101, a cuboid box, 102, a heating rod, 103, a temperature sensor, 104, and upper and lower cover fixing screw bases (the upper and lower covers of the cuboid box are not drawn).

Detailed Description

The trace ozone concentration luminescence measuring device XHX- -O3 cl is taken as an example, and the attached drawings of the specification are combined to explain that figure 1 is as follows: the design idea of the device for measuring the trace ozone by using the XHX-O3 cl is that the chemiluminescence fluorescence attenuation distance is used for determining the long axis of the inner cavity of the ellipsoid sphere, the volume of the sphere, the air quantity, the diameter ratio of the tube, the flow speed and the flow. Examining the chemiluminescence handbook, wherein the fluorescence attenuation distance is 100 mm; the intracavity reflection optical path 2c is less than 100 mm, so that the major axis c of the ellipsoidal cavity is equal to 30 mm, and the minor axis a = b =20 mm. The inner diameter of the quartz glass lens is 18 mm, and a sealing gasket is matched. The volume of the sphere lumen was calculated to be 50 ml. Experiments show that the particles in the environmental sample gas influence chemiluminescence, so a particle filtering device is added at a sampling port. The environment sample gas enters the environment sample gas input pipeline by filtering particulate matters through a sampling port with a particle filtering device and controlling the flow of the sample gas through a flowmeter. The diameter of the environment sample gas input pipeline is 0.20 mm to 1.2 mm, the diameter is 0.6 mm, the distance from a focus is 6 mm, and the flow is 1 ml/min; the pipe diameter of the standard gas input pipeline is 3 mm-12 mm, 6 mm is selected, the distance from a focus is 0.6 mm, and the flow is 10 ml/min. At a proper temperature of 50 ℃, in the ellipsoidal reaction chamber, the thin front side of an environment sample gas input pipeline is =0.6 mm, and the distance from an outlet end to a focus is 6 mm; the mark gas input pipeline is thick in the middle and in the middle =6 mm, and is 0.6 mm apart from the focus from the exit end. The two gases are oppositely arranged along the radius of the over focus, the convergence point of the two gases is near the focus, and the NO gas wraps the O3 gas; NO reacts with O3 to generate excited NO2 molecules, NO2 molecules cannot exist stably, the NO rapidly attenuates to ground NO2, the time is less than 1 nanosecond, fluorescence with the central wavelength of 1200nm is radiated, the spectral range of the fluorescence is 600-3000 nm, and the light-emitting point is near the focus; the exhaust pipeline is perpendicular to the connection line of the environment sample gas input pipeline and the standard gas input pipeline, the exhaust pipeline points to the focus, the two gases are discharged from the exhaust pipeline after being converged, and the gas luminous band is also positioned on the focal plane of the left ellipsoid; by adjusting the distance between the environment sample gas input pipeline and the standard gas input pipeline and adjusting the flow, the center of NO gas injected by O3 gas is ensured, all O3 gas is subjected to luminous reaction, is reflected by the ellipsoidal inner cavity, passes through the quartz glass lens, and is totally emitted to reach the photomultiplier to be converted into a voltage signal, and the light efficiency of the photomultiplier is close to 90%. The voltage signal strength is proportional to the optical signal strength. And the voltage signal enters the MCU minimum system after linear amplification and analog-to-digital conversion. The MCU minimum system outputs the concentration of O3 gas. According to experimental tests, the detected concentration of O3 gas is 0.01-0.05 ppb. The detection limit is improved by one order of magnitude compared with a spherical reaction chamber.

The invention has the advantages that the ellipsoid light-emitting chamber is arranged in the thermostatic chamber, the optimal chemiluminescence temperature is kept by utilizing the optical characteristic of total internal reflection of the ellipsoid and the thermostatic temperature characteristic of the thermostatic chamber, the flow meters of the environmental sample gas input pipeline and the standard gas input pipeline are controlled, and the center of the mixture of O3 gas and NO gas is ensured to be at the left focus of the ellipsoid inner cavity; all the focal plane luminescence is reflected in the inner cavity of the cast aluminum ellipsoid and is concentrated to the right focus of the inner cavity of the ellipsoid, passes through the quartz glass lens in the middle of the ellipsoid and is concentrated to the photomultiplier window of the other focus, so that the ozone detection limit is improved, and the light utilization rate exceeds 90%. The detachable constant temperature chamber is arranged, so that the ellipsoid cavity can be conveniently and periodically checked and maintained, and the quartz glass lens is scrubbed.

Claims (2)

1. A trace ozone concentration measuring device is characterized in that a detachable ellipsoid light-emitting chamber of the ozone concentration measuring device is arranged inside a detachable thermostatic chamber (10); the shape of the detachable thermostatic chamber (10) is a rectangular box (101), the long axis of the ellipsoid light-emitting chamber is along the long side direction of the rectangular box (101), the long side of the rectangular box (101) is larger than 2 times of the long axis of the ellipsoid light-emitting chamber, the lengths of two short sides of the rectangular box (101) are the same, and the length of the short side of the rectangular box (101) is larger than 2 times of the short axis of the ellipsoid light-emitting chamber; fixed screw seats (104) are arranged at four corners of the rectangular box (101), an upper cover and a lower cover of the rectangular box (101) are movable covers, and the upper cover and the lower cover are fixed by screws at the four corners; the heating rod (102) and the temperature sensor (103) are further arranged in the rectangular box (101), the heating rod (102) and the temperature sensor (103) are electrically connected with the MCU microprocessor (11), the MCU microprocessor (11) controls the constant temperature in the detachable thermostatic chamber (10), and the preferable temperature in the detachable thermostatic chamber (10) is in a temperature section suitable for the fluorescence generation of excited NO 2; the preferred 2-fold long axis of the ellipsoid is less than or equal to 100 mm of the fluorescence propagation distance; the detachable ellipsoidal luminous chamber comprises a left ellipsoidal spherical shell (1), six flange lug bottoms (4) outside the left and right ellipsoidal spherical shells, a quartz glass lens (5), a right ellipsoidal spherical shell (7), and six flange lug tops (8) outside the left and right ellipsoidal spherical shells; the left ellipsoidal spherical shell (1) and the right ellipsoidal spherical shell (7) adopt cast aluminum ellipsoidal shells, and the interiors of the cast aluminum ellipsoidal shells are polished; as shown in fig. 2, a quartz glass lens (5) is added between a left ellipsoidal spherical shell (1) and a right ellipsoidal spherical shell (7), the left ellipsoidal spherical shell (1) and the right ellipsoidal spherical shell (7) are mechanically connected through six flange lugs at the outside, lower flange lugs (4) and six flange lugs at the outside, and threaded through holes and bolts at the flange lugs (7), and the left ellipsoidal spherical shell (1) and the right ellipsoidal spherical shell (7) are folded to form a detachable ellipsoidal luminous chamber; the left ellipsoidal spherical shell (1) and the quartz glass lens (5) form a closed luminous reaction chamber; on the cross section of a focal plane x = -c of the left ellipsoidal light-emitting chamber, from a horizontal line of a overfocus point on the cross section, a hole which can be sealed oppositely is arranged along the clockwise direction, a standard gas input pipeline (3) and an environment sample gas input pipeline (9) are sequentially arranged, and the environment sample gas input pipeline (9) and the standard gas input pipeline (3) are arranged on the diameter of the overfocus point; a closable hole is formed in the long shaft of the left ellipsoidal luminous chamber, and an exhaust pipeline (2) is installed at the closable hole; an environment sample gas input pipeline (9) and a standard gas input pipeline (3) which are oppositely arranged on a focal plane x = -f of a left ellipsoidal shell (1) are oppositely arranged around the focal point of the ellipsoidal shell, the intersection point of ozone and NO of two gases is at the focal point of the left ellipsoidal shell, the NO gas wraps ozone gas, an exhaust pipeline is arranged on the long axis of the left ellipsoidal shell, and the two gases are mixed and excited to emit chemiluminescence at the focal point of the left ellipsoidal shell; a quartz glass lens (5) and a right ellipsoidal spherical shell (7) form a closed photoelectric conversion chamber, a hole is formed in the right ellipsoidal spherical shell (7) along the focal plane x = f of an ellipsoidal light-emitting chamber, a photomultiplier (6) is installed, and an optical window of the photomultiplier (6) is positioned on the focal point of the right ellipsoidal spherical shell; chemiluminescence of the focus of the left ellipsoidal spherical shell (1), direct incidence or internal reflection of the ellipsoidal spherical shell, and optical connection of a quartz glass lens (5) between the left ellipsoidal spherical shell (1) and the right ellipsoidal spherical shell (7) with an optical window of a photomultiplier (6) of the focus of the right ellipsoidal spherical shell (7); an exhaust pipeline (2), a standard gas pipeline (3) and an environment sample gas input pipeline (9) penetrate through the left wall of the detachable thermostatic chamber (10), wherein the environment sample gas input pipeline (9) is connected with the inlet end of a sample gas flowmeter (91) through a pipeline, the outlet end of the sample gas flowmeter (91) is connected with the gas outlet end of a peristaltic sampling pump (92) through a pipeline, and the gas inlet end of the peristaltic sampling pump (92) is connected with a sampling port (93) with a particle filtering device; the standard gas input pipeline (3) is connected with the inlet end of a standard gas flowmeter (31) through a pipeline, the outlet end of the standard gas flowmeter (31) is connected with a standard gas pressure reducing valve (32) through a pipeline, and the standard gas pressure reducing valve (32) is connected with a standard gas source (33); the exhaust pipeline (2) is connected with a one-way valve (22) through a pipeline, the one-way valve (22) is connected with an exhaust gas outlet (20), and the one-way valve (22) only allows one-way ventilation.

2. The trace ozone concentration measuring device as claimed in claim 1, wherein the standard gas pressure reducing valve (32), the peristaltic sampling pump (92), the heating rod (102), the temperature sensor (103) and the photomultiplier (6) are electrically connected with the MCU microprocessor (11), and the MCU microprocessor (11) is electrically connected with the display screen (12); the MCU microprocessor (11) receives the electric quantity signal of the photomultiplier, converts the electric quantity signal into an ozone concentration signal, displays the ozone concentration and uploads the ozone concentration signal to an upper computer.

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