CN209979488U - Detection of SO by ultraviolet fluorescence2Device for the preparation of - Google Patents
Detection of SO by ultraviolet fluorescence2Device for the preparation of Download PDFInfo
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- CN209979488U CN209979488U CN201920262245.XU CN201920262245U CN209979488U CN 209979488 U CN209979488 U CN 209979488U CN 201920262245 U CN201920262245 U CN 201920262245U CN 209979488 U CN209979488 U CN 209979488U
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Abstract
The utility model provides a detect SO with ultraviolet fluorescence2The device for detecting the content comprises a light source, a photochemical reaction cavity, an extinction cone, a reference sensor and a fluorescence detection device; the light source is used for emitting ultraviolet light to the photochemical reaction cavity and measuring SO in the sample gas2Can be excited by ultraviolet light and converted into SO2 +(ii) a The reference sensor is used for detecting the light intensity of the ultraviolet light; one end of the extinction cone is communicated with the photochemical reaction cavity, the other end of the extinction cone is communicated with the reference sensor, light rays emitted by the light source can enter the extinction cone through the photochemical reaction cavity, and the extinction cone is provided with an optical path with a gradually reduced radial size in the process of extending from the photochemical reaction cavity to the reference sensor; fluorescence detection deviceIs configured to receive the fluorescence and detect an intensity of the fluorescence. The device sets up the extinction awl in the outside of photochemical reaction chamber to avoid the ultraviolet ray that the light source sent to produce diffuse reflection in photochemical reaction intracavity, avoid producing the interference to fluorescence detection device's detection, and then improved detecting system's accuracy.
Description
Technical Field
The utility model relates to the technical field of environmental protection, and in particular to detect SO with ultraviolet fluorescence2And (4) a content device.
Background
SO is generated in the fields of coal mining, coal-fired power generation, steel smelting, non-ferrous metal smelting, petrochemical industry and the like2And the pollution to the atmosphere can be caused. But sometimes SO2The concentration is low and is not easy to detect.
For measuring SO2In terms of content, there are currently electrical conductivity methods, optical fiber sensor methods, and flame photometry methods on the market. In the measurement of SO by means of electrical conductivity2During the content process, the measurement is susceptible to other substances having an influence on the conductivity, and is greatly influenced by the temperature. The optical fiber sensor has high cost and low sensitivity. When the flame photometry is adopted, a hydrogen gas source is needed, and potential safety hazards exist.
SUMMERY OF THE UTILITY MODEL
In addition to the methods described in the background, UV fluorescence can also be used to measure SO2And (4) content. The UV fluorescence method is based on molecular emission spectrometry, when UV light irradiates on SO2When on the molecule, SO2To a higher energy orbital to become an excited SO2 +SO since the system will seek the lowest energy steady state2 +Quickly returning to its ground state, releasing excess energy in the form of fluorescent photons. After fluorescence is formed, the intensity of the fluorescence is measured, and then the roots areAccording to the intensity of light and SO2Is determined by the concentration relationship of2The concentration of (c).
The ultraviolet fluorescence method is particularly suitable for SO2A system for continuously monitoring atmosphere with low concentration.
An object of the utility model is to provide a detect SO with ultraviolet fluorescence2The device with the content has the characteristics of high sensitivity, strong anti-interference capability, higher repeatability and higher stability.
Provides a method for detecting SO by using ultraviolet fluorescence2Device for measuring SO by ultraviolet fluorescence2The device for detecting the content comprises a light source, a photochemical reaction cavity, an extinction cone, a reference sensor and a fluorescence detection device;
the light source is used for emitting ultraviolet light to the photochemical reaction cavity and measuring SO in the sample gas2Can be excited by the ultraviolet light to convert into SO2 +Said SO2 +In the conversion to SO2Then the fluorescent light is emitted;
the reference sensor is used for detecting the light intensity of the ultraviolet light;
one end of the extinction cone is communicated with the photochemical reaction cavity, the other end of the extinction cone is communicated with the reference sensor, light emitted by the light source can enter the extinction cone through the photochemical reaction cavity, and the extinction cone is provided with a light passage with a gradually reduced radial size in the process of extending from the photochemical reaction cavity to the reference sensor;
the fluorescence detection device is used for receiving the fluorescence and detecting the intensity of the fluorescence.
In at least one embodiment, the extinction cone is provided with a sample gas inlet, the photochemical reaction chamber is provided with a sample gas outlet, and a sample gas to be measured can enter the extinction cone and the photochemical reaction chamber from the sample gas inlet in sequence and leave the photochemical reaction chamber from the sample gas outlet.
In at least one embodiment, the sample gas inlet is opened at the end of the extinction cone far away from the photochemical reaction chamber, and the sample gas outlet is opened at the wall of the photochemical reaction chamber far away from the extinction cone.
In at least one embodiment, an optical axis of the ultraviolet light emitted from the light source into the photochemical reaction chamber passes through the extinction cone, and the fluorescence detection device is located between the light source and the extinction cone in an extending direction of the optical axis.
In at least one embodiment, the fluorescence detection device is located outside the photochemical reaction chamber and lateral to the light emitted by the light source.
In at least one embodiment, the incident light direction of the fluorescence detection device is perpendicular to the light emission direction of the light source.
In at least one embodiment, the photochemical reaction chamber has a fluorescence entrance port communicating with the fluorescence detection device, and the detecting of SO by ultraviolet fluorescence2The device for detecting the content of the fluorescent substance further comprises a fluorescent light filter, the fluorescent light filter is positioned outside the fluorescent light entrance port, and the fluorescent light passes through the fluorescent light filter and is emitted into the fluorescent light detection device.
In at least one embodiment, the detecting SO with ultraviolet fluorescence2The device for detecting the content of the fluorescent light also comprises a biconvex lens, wherein the biconvex lens is positioned between a light incidence port of the fluorescent detection device and the fluorescent filter, and the fluorescent light is emitted into the fluorescent detection device along a main optical axis of the biconvex lens.
In at least one embodiment, the detecting SO with ultraviolet fluorescence2The device for measuring the content of the photochemical reaction product also comprises an ultraviolet light filter, wherein the ultraviolet light filter is positioned outside the light emitting port of the light source, and the ultraviolet light penetrates through the ultraviolet light filter and is injected into the photochemical reaction cavity.
In at least one embodiment, the detecting SO with ultraviolet fluorescence2The device for measuring the content of the ultraviolet light comprises an ultraviolet light filter, a photochemical reaction cavity and a collimating convex lens, wherein the collimating convex lens is positioned between the ultraviolet light filter and the photochemical reaction cavity, and the ultraviolet light is emitted into the photochemical reaction cavity along a main optical axis of the collimating convex lens.
According to the utility model discloses a with device of ultraviolet fluorescence detection SO2 content can obtain following beneficial effect:
the device sets up the extinction awl in the outside of photochemical reaction chamber to avoid the ultraviolet ray that the light source sent to produce diffuse reflection in photochemical reaction intracavity, avoid producing the interference to fluorescence detection device's detection, and then improved detecting system's accuracy.
Drawings
FIG. 1 is a diagram showing the detection of SO by ultraviolet fluorescence provided by the present invention2Schematic illustration of one specific embodiment of an apparatus for measuring.
Description of reference numerals:
10 a fluorescent system; 101, extinction taper; 104 a light source; 105 a light cutter; 106 an ultraviolet light filter; 107 collimating convex lens; 108 a reference sensor; 109 a photochemical reaction cavity; 110 detecting the light channel; 111 a sample gas inlet; 112 sample gas outlet; 113 a fluorescence detection device; 114 a double convex lens; 115 a fluorescent filter; 117 a fluorescence entrance port; 118 an ultraviolet light entrance port; 119 an ultraviolet light exit port;
20, a gas path system; 201 an air inlet pipeline; 202 an air outlet pipeline; 203 a hydrocarbon removal device; 204 a filter device; 205 sample gas/reference gas switching valve; 206 a flow restriction orifice; 207 a pressure sensor; 208 a flow sensor; 209 a pump; 211 a reference gas line; 212 sample gas line.
Detailed Description
Exemplary embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood that the detailed description is only intended to teach one skilled in the art how to practice the invention, and is not intended to exhaust all possible ways of practicing the invention, nor is it intended to limit the scope of the invention.
The utility model provides a detect SO with ultraviolet fluorescence2Content device (hereinafter referred to as device).
As shown in FIG. 1, in one embodiment, the apparatus includes an air path system 20 and a fluorescence system 10, the air path system 20 being used to transport sample gases to and from the fluorescence system 10. The gas circuit system 20 and the fluorescence system 10 are described in detail below.
Gas circuit system 20
As shown in fig. 1, the gas circuit system 20 mainly includes a sample gas circuit 212, a reference gas circuit 211, a gas inlet circuit 201 and a gas outlet circuit 202.
The sample gas line 212 communicates with the sample gas source and the gas inlet line 201, and the reference gas line 211 communicates with the reference gas source and the gas inlet line 201. The gas inlet line 201 communicates with a fluorescence reaction chamber (described in detail below) of the fluorescence system 10 so that a sample gas or a reference gas can enter the fluorescence system 10 (fluorescence reaction chamber). Gas outlet line 202 communicates with the fluorescence reaction chamber so that the detected sample gas in the fluorescence reaction chamber can exit the fluorescence reaction chamber.
The reference gas may comprise zero-order air (containing no SO)2) Or SO with a certain concentration (known concentration)2Of the air of (2). The sample gas is SO with a certain concentration (unknown concentration)2Of the air of (2).
The reference gas line 211 and the sample gas line 212 are connected to the gas inlet line 201 via a sample gas/reference gas switching valve 205.
When it is desired to calibrate the fluorescence detection device 113 (described in detail below), the sample/reference gas switching valve 205 is adjusted to close the sample gas line 212 and connect the reference gas line 211 to the gas inlet line 201, so that the reference gas enters the gas inlet line 201 and then enters the fluorescence system 10 and is detected by the fluorescence detection device 113.
When the SO in the sample gas needs to be detected2When the sample gas/reference gas switching valve 205 is closed, the reference gas line 211 is closed, and the sample gas line 212 and the gas inlet line 201 are connected, so that the sample gas enters the fluorescence system 10 through the gas inlet line 201 and is detected by the fluorescence detection device 113.
Specifically, the sample/reference gas switching valve 205 may be a three-way valve.
The gas circuit system 20 further includes a filtering device 204 disposed on the sample gas pipeline 212, and a hydrocarbon removing device 203 disposed on the gas inlet pipeline 201. The sample gas can flow through the filter apparatus 204, the sample gas/reference gas switching valve 205, and the hydrocarbon removal apparatus 203 in that order into the fluorescence system 10.
The filtering device 204 is used to remove impurities such as dust in the sample gas, so as to avoid the impurities in the sample gas from interfering with the measurement.
Hydrocarbon removal unit 203 includes an inner tube, an outer tube, and a tee assembly. The inner pipe is made of composite silicon rubber material with selective permeability to hydrocarbon substances and is used for carrying out permeation treatment on sample gas flowing through to enable the hydrocarbon substances to permeate to the outer wall. The outer pipe is sleeved on the periphery of the inner pipe, a gas circulation channel is formed between the outer pipe and the inner pipe, and the gas circulation channel is used for carrying away hydrocarbon substances on the outer wall of the pipe when backflushing airflow flows through the gas circulation channel. The tee joint component is used for connecting the inner pipe and the outer pipe, so that the sample gas and the backflushing gas can separately circulate in the inner pipe and the gas circulation channel. The sample gas passing through the hydrocarbon removal device 203 will no longer contain hydrocarbon species, thereby avoiding interference with the measurement by the hydrocarbon species.
Outlet line 202 includes a flow restriction orifice 206, a pressure sensor 207, and a flow sensor 208. The flow restriction orifice 206 acts to stabilize the flow. The pressure sensor 207 functions to measure the system pressure to provide a pressure compensation signal. The flow sensor 208 functions to measure the system flow to provide a flow compensation signal.
The outlet gas line 202 is also connected to a tee fitting of the hydrocarbon removal device 203 on the inlet gas line 201 in communication with the gas flow channels of the hydrocarbon removal device 203 such that hydrocarbon material in the gas flow channels is carried away from the hydrocarbon removal device 203 by the gas flow in the outlet gas line 202.
The outlet line 202 further includes a pump 209 disposed downstream of the flow restriction orifice 206, the pressure sensor 207, and the flow sensor 208, the pump 209 functioning to pump the detected sample gas within the fluorescence reaction chamber.
Fluorescence system 10
As shown in FIG. 1, the fluorescence system 10 basically includes a fluorescence reaction chamber, a reference sensor 108, a fluorescence detection device 113 and a light source 104.
Light source 104, which may be an ultraviolet zinc lamp, emits ultraviolet light into the fluorescent reaction chamber.
The fluorescence reaction chamber has a photochemical reaction cavity 109, an extinction cone 101 and a detection light channel 110.
The photochemical reaction chamber 109 has an ultraviolet light incident port 118, an ultraviolet light exit port 119, and a fluorescence incident port 117.
The light source 104 and the photochemical reaction chamber 109 have a detection light channel 110 therebetween, and the detection light channel 110 is communicated with the ultraviolet light incident port 118, so that the ultraviolet light can enter the photochemical reaction chamber 109 through the detection light channel 110 and the ultraviolet light incident port 118.
An extinction cone 101 is arranged between the reference sensor 108 and the photochemical reaction chamber 109, one end of the extinction cone 101 is communicated with an ultraviolet light outlet 119, and the other end of the extinction cone 101 is communicated with the reference sensor 108, so that ultraviolet light can be incident to the reference sensor 108 through the extinction cone 101.
The reference sensor 108 detects the intensity of the ultraviolet light emitted by the light source 104, thereby evaluating the lifetime of the light source 104.
The extinction cone 101 has an optical path with a tapered radial dimension as it extends from the photochemical reaction chamber 109 to the reference sensor 108.
Such an optical path can perform an extinction function, and can prevent the ultraviolet light emitted by the light source 104 from generating diffuse reflection in the photochemical reaction chamber 109, thereby preventing the detection of the fluorescence detection device 113 from being interfered.
The fluorescence detection device 113 is disposed outside the photochemical reaction chamber 109 and beside the light emitted from the light source 104, the fluorescence entrance port 117 is communicated with the fluorescence detection device 113, and the fluorescence of the photochemical reaction chamber 109 can enter the fluorescence detection device 113 through the fluorescence entrance port 117.
Thus, the interference of the ultraviolet light entering the fluorescence detection device 113 to the incident fluorescence can be avoided, and the accuracy of the detection result can be ensured.
After the intensity of the fluorescence is detected by the fluorescence detection device 113, the intensity of the fluorescence and SO are used as the basis2(ii) concentration of (e.g., the intensity of fluorescence in a low humidity environment with 0 to 143 mg/m)3SO in the range2Is linearly related to the concentration of (c), SO can be obtained2The concentration of (c).
Measurement of SO by ultraviolet fluorescence2The content has the following advantages: high sensitivity, good selectivity, large measurement range, no need of chemical agents and capability of realizing real-time measurement.
The photochemical reaction chamber 109 also has a sample gas inlet 111 and a sample gas outlet 112.
The sample gas inlet 111 may open into the extinction cone 101, and the sample gas outlet 112 may open into the photochemical reaction chamber 109. The gas inlet line 201 is connected to the sample gas inlet 111 so that the sample gas enters the extinction cone 101 and the photochemical reaction chamber 109 through the sample gas inlet 111, and the gas outlet line 202 is connected to the sample gas outlet 112 so that the sample gas exits the photochemical reaction chamber 109 through the sample gas outlet 112.
Preferably, the sample gas inlet 111 may be opened at an end of the extinction cone 101 away from the photochemical reaction chamber 109, and the sample gas outlet 112 may be opened at a wall of the photochemical reaction chamber away from the extinction cone 101. Thus, the sample gas inlet 111 and the sample gas outlet 112 are spaced apart by a relatively large distance, so that the reaction time of the sample gas in the photochemical reaction chamber can be prolonged.
In other embodiments, the sample gas inlet 111 and the sample gas outlet 112 may be both opened on the wall of the photochemical reaction chamber 109.
The fluorescence system 10 further comprises a collimating convex lens 107, the collimating convex lens 107 being between the light source 104 and the detection light channel 110, the main optical axis of the collimating convex lens 107 being parallel to the extension direction of the detection light channel 110.
The light emitted from the light source 104 is radial, and ultraviolet light enters the detection light channel 110 in a parallel state along the main optical axis of the collimating convex lens 107 after passing through the collimating convex lens 107, and the ultraviolet light hardly enters the fluorescence detection device 113, so that the detection accuracy is ensured.
The fluorescence system 10 further comprises a light cutter 105 between the light source 104 and the detection light channel 110, and the light cutter 105 can time-divisionally let the uv light into the photo-chemical reaction chamber 109.
During detection, ultraviolet light is emitted into the photochemical reaction chamber 109 through the light cutter 105, SO that the sample gas is irradiated by the ultraviolet light to cause SO2Conversion to SO2 +(ii) a The light chopper 105 is then rotated at an angle such that the ultraviolet light is blocked from entering the photochemical reaction chamber 109, thereby causing SO2 +Conversion to SO2And emits fluorescence. The fluorescence is received by the fluorescence detection device 113 for detecting SO2The content of (a).
The fluorescence system 10 also includes an ultraviolet light filter 106, and the ultraviolet light filter 106 may be located outside the light emitting port of the light source 104. Ultraviolet light sequentially passes through the light cutter 105, the ultraviolet light filter 106, the collimating convex lens 107, the detection light channel 110 and the ultraviolet light entrance port 118 and enters the photochemical reaction chamber 109.
The ultraviolet light filter 106 may pass ultraviolet light having a wavelength of 190nm to 230nm into the photochemical reaction chamber 109.
The ultraviolet light with the wave band of 190nm to 230nm can well excite SO2。
Preferably, the center wavelength of the uv filter 106 may be 214nm, and the half-band width is 10 nm.
Preferably, the incident light direction of the fluorescence detection device 113 may be perpendicular to the light emission direction of the light source 104 (the main optical axis direction of the collimating convex lens 107).
The fluorescence system 10 may further include a double-convex lens 114, the double-convex lens 114 may be located between the fluorescence detection device 113 and the photochemical reaction chamber 109, and a main optical axis direction of the double-convex lens 114 may be parallel to an incident light direction of the fluorescence detection device 113.
The double convex lens 114 acts as a focusing, SO2 +To SO2The fluorescence produced is divergent and weak and can be conveniently detected after focusing the energy through the lenticular lens 114.
The fluorescence detection device 113 may specifically include a photomultiplier tube, and the direction of the main optical axis of the double convex lens 114 is parallel to the direction of incident light of the photomultiplier tube.
The fluorescence system 10 may further include a fluorescence filter 115, and the fluorescence filter 115 may be located outside the fluorescence entrance port 117 of the photochemical reaction chamber 109, and may be specifically located between the double convex lens 114 and the photochemical reaction chamber 109. The fluorescence sequentially passes through the fluorescence filter 115 and the lenticular lens 114 and enters the fluorescence detection device 113.
The central wavelength of the fluorescence filter 115 may be 330nm, and the half-band width is 50nm, so that the fluorescence with a wavelength of about 330nm passes through and enters the fluorescence detection device 113.
SO2 +Conversion to SO2Wavelength of time-released fluorescenceIn the ultraviolet band, the center wavelength is 330nm, and the fluorescence filter 115 can adapt to the wavelength to eliminate the fluorescence to be detected.
It should be understood that the above embodiments are exemplary only, and are not intended to limit the present invention. Various modifications and alterations of the above-described embodiments may be made by those skilled in the art in light of the teachings of the present invention without departing from the scope thereof.
Claims (10)
1. Ultraviolet fluorescence detection of SO2The device for detecting SO is characterized in that the device for detecting SO by ultraviolet fluorescence2The device for detecting the content of the sample comprises a light source (104), a photochemical reaction cavity (109), an extinction cone (101), a reference sensor (108) and a fluorescence detection device;
the light source (104) is used for emitting ultraviolet light to the photochemical reaction cavity (109) and measuring SO in the sample gas2Can be excited by the ultraviolet light to convert into SO2 +Said SO2 +In the conversion to SO2Then the fluorescent light is emitted;
the reference sensor (108) is used for detecting the light intensity of the ultraviolet light;
one end of the extinction cone (101) is communicated with the photochemical reaction cavity (109), the other end of the extinction cone (101) is communicated with the reference sensor (108), light emitted by the light source (104) can enter the extinction cone (101) through the photochemical reaction cavity (109), and the extinction cone (101) has a light passage with a gradually reduced radial size in the process of extending from the photochemical reaction cavity (109) to the reference sensor (108);
the fluorescence detection device (113) is used for receiving the fluorescence and detecting the intensity of the fluorescence.
2. Detection of SO with ultraviolet fluorescence according to claim 12The content device is characterized in that a sample gas inlet (111) is formed in the extinction cone (101), a sample gas outlet (112) is formed in the photochemical reaction cavity (109), and sample gas to be detected can enter the extinction cone (101) and the photochemical reaction cavity in sequence from the sample gas inlet (111)(109) And exits the photochemical reaction chamber (109) from the sample gas outlet (112).
3. Detection of SO with ultraviolet fluorescence according to claim 22The device for measuring the content of the waste water is characterized in that the sample gas inlet (111) is arranged at the end part, far away from the photochemical reaction cavity (109), of the extinction cone (101), and the sample gas outlet (112) is arranged at the cavity wall, far away from the extinction cone (101), of the photochemical reaction cavity (109).
4. Detection of SO with ultraviolet fluorescence according to claim 12Device for measuring the concentration of a substance, characterized in that the optical axis of the ultraviolet light entering the photochemical reaction chamber (109) from the light source (104) passes through the extinction cone (101), and in the direction of extension of the optical axis the fluorescence detection device (113) is located between the light source (104) and the extinction cone (101).
5. Detection of SO with ultraviolet fluorescence according to claim 12The device for detecting the content is characterized in that the fluorescence detection device (113) is positioned outside the photochemical reaction cavity (109) and is positioned at the side of the light emitted by the light source (104).
6. Detection of SO with ultraviolet fluorescence according to claim 52-means for detecting content, characterized in that the direction of the incident light of said fluorescence detection means (113) is perpendicular to the direction of the light emission of said light source (104).
7. Detection of SO with ultraviolet fluorescence according to claim 52The device for detecting the content is characterized in that the photochemical reaction chamber (109) is provided with a fluorescence entrance port (117) communicated with the fluorescence detection device (113), and the SO is detected by ultraviolet fluorescence2The device for detecting the content of the fluorescent substance further comprises a fluorescent filter (115), wherein the fluorescent filter (115) is positioned outside the fluorescent light entrance port (117), and the fluorescent light passes through the fluorescent filter (115) and enters the fluorescent light detection device (113).
8. Detection of SO with ultraviolet fluorescence according to claim 72The device for detecting SO is characterized in that the device for detecting SO by ultraviolet fluorescence2The device for detecting the content of the fluorescent light further comprises a double-convex lens (114), wherein the double-convex lens (114) is located between a light incident port of the fluorescent light detection device (113) and the fluorescent light filter (115), and the fluorescent light is emitted into the fluorescent light detection device (113) along a main optical axis of the double-convex lens (114).
9. Detection of SO with ultraviolet fluorescence according to claim 12The device for detecting SO is characterized in that the device for detecting SO by ultraviolet fluorescence2The device for measuring the content of the waste water further comprises an ultraviolet light filter (106), wherein the ultraviolet light filter (106) is positioned outside a light emitting port of the light source (104), and the ultraviolet light penetrates through the ultraviolet light filter (106) to be injected into the photochemical reaction cavity (109).
10. Detection of SO with ultraviolet fluorescence according to claim 92The device for detecting SO is characterized in that the device for detecting SO by ultraviolet fluorescence2The device for measuring the content of the ultraviolet light further comprises a collimating convex lens (107), wherein the collimating convex lens (107) is positioned between the ultraviolet light filter (106) and the photochemical reaction cavity (109), and the ultraviolet light is emitted into the photochemical reaction cavity (109) along a main optical axis of the collimating convex lens (107).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920262245.XU CN209979488U (en) | 2019-03-01 | 2019-03-01 | Detection of SO by ultraviolet fluorescence2Device for the preparation of |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920262245.XU CN209979488U (en) | 2019-03-01 | 2019-03-01 | Detection of SO by ultraviolet fluorescence2Device for the preparation of |
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| CN209979488U true CN209979488U (en) | 2020-01-21 |
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| CN201920262245.XU Active CN209979488U (en) | 2019-03-01 | 2019-03-01 | Detection of SO by ultraviolet fluorescence2Device for the preparation of |
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