CN217786891U - O2 concentration measuring device - Google Patents
O2 concentration measuring device Download PDFInfo
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- CN217786891U CN217786891U CN202221680929.XU CN202221680929U CN217786891U CN 217786891 U CN217786891 U CN 217786891U CN 202221680929 U CN202221680929 U CN 202221680929U CN 217786891 U CN217786891 U CN 217786891U
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Abstract
The utility model provides a O 2 A concentration measuring device; the problem that in the prior art, due to the existence of an air section between a converging lens and a receiver, a measuring result has deviation is solved; the device comprises a transmitting unit and a receiving unit, wherein the transmitting unit and the receiving unit are respectively arranged on two opposite sides of a pipeline to be tested; the transmitting unit is used for transmitting laser, and the transmitting direction of the laser is vertical to the flowing direction of the gas in the pipeline to be detected; the laser emitted by the emitting unit passes through the gas in the tested pipeline and then is received by the receiving unit; the receiving unit comprises a converging lens, a receiver and a first flange; also includes a filling section; convergenceThe lens, the filling section and the receiver are sequentially arranged along the laser receiving direction and are arranged on a pipeline through which O2 to be detected flows through by a first flange; the filling section is made of transparent materials, the front end of the filling section is attached to the converging lens, and a gap of 2-3mm is arranged between the rear end of the filling section and the receiver; the filling section is arranged coaxially with the converging lens.
Description
Technical Field
The utility model relates to a gaseous measuring device, concretely relates to O 2 A concentration measuring device.
Background
In carrying out O on the pipeline 2 When measuring concentration, the instrumentAn optical system is often added on the pipeline, namely, a through hole is formed on the pipeline oppositely, a transmitting unit is arranged on one side, a receiving unit is arranged on the other side, the laser emitted by the transmitting unit is vertical to the flowing direction of the gas, and the laser emitted by a laser is received by the receiving unit after passing through the gas flow, so that O-shaped channel alignment is realized 2 And (4) measuring the concentration.
In the prior art, a receiving unit generally comprises a converging lens 01 and a receiver 02, as shown in fig. 1, a long air section 03 exists between the converging lens 01 and the receiver 02, the oxygen content in the air is 20.8%, data measured by laser received by the receiving end 02 after passing through the air section 03 has a certain deviation, and O in a pipeline is generated 2 At very low concentrations, the deviations are particularly pronounced.
SUMMERY OF THE UTILITY MODEL
The utility model aims at solving the problem that the measurement result has deviation due to the existence of the air section between the convergent lens and the receiver existing in the prior art, and providing an O 2 A concentration measuring device.
In order to achieve the above purpose, the utility model adopts the technical scheme that:
o-shaped catalyst 2 The concentration measuring device comprises a transmitting unit and a receiving unit, wherein the transmitting unit and the receiving unit are respectively arranged on two opposite sides of the pipeline to be measured; the transmitting unit is used for transmitting laser, and the transmitting direction of the laser is vertical to the flowing direction of gas in the pipeline to be detected; the laser emitted by the emitting unit passes through the gas in the tested pipeline and then is received by the receiving unit;
the receiving unit comprises a converging lens, a receiver and a first flange;
the method is characterized in that:
also comprises a filling section;
the converging lens, the filling section and the receiver are sequentially arranged along the laser receiving direction and are arranged on a pipeline through which O2 to be detected flows through by the first flange;
the filling section is made of transparent materials, the front end of the filling section is attached to the converging lens, and a gap of 2-3mm is arranged between the rear end of the filling section and the receiver;
the filling section is arranged coaxially with the converging lens.
Further, the emission unit comprises a laser emitter, a collimating mirror and a second flange;
the laser transmitter is used for transmitting laser;
laser emitter and collimating mirror all install on being surveyed the pipeline through the second flange, and the collimating mirror is located the emergent light way of laser, and the collimating mirror is used for carrying out the collimation to the laser that laser emitter launches.
Furthermore, the filling section is made of glass.
Further, in order to facilitate light focusing, the curvature radius of the converging lens is 35mm, the diameter of the plane end of the converging lens is 75mm, and the diameter of the filling section is 78mm.
Furthermore, when the receiving unit needs to be maintained, if the receiving unit is directly disassembled, the risk of gas leakage in the detected pipeline can occur, and in order to avoid the leakage risk, the receiving unit also comprises a first on-off valve;
the first on-off valve is used for controlling the on-off of the receiving unit and the air flow in the detected pipeline;
the first on-off valve is installed on the first flange and is arranged at the front end of the converging lens along the laser receiving direction.
Furthermore, when the emission unit needs to be maintained, if the emission unit is directly disassembled, the risk of gas leakage in the detected pipeline can occur, and in order to avoid the leakage risk, the emission unit also comprises a second on-off valve;
the second on-off valve is used for controlling the on-off of the transmitting unit and the air flow in the detected pipeline;
and the second on-off valve is arranged on the second flange and is arranged at the rear end of the collimating mirror along the laser emission direction.
Further, a gap of 2mm is arranged between the rear end of the filling section and the receiver, the length of the air section is reduced to 2mm, the interference of oxygen in the air is basically avoided, and the measurement accuracy is guaranteed.
Further, the laser emitter emits laser light with a wavelength of 763nm or 760nm, and currently 763nm is mostly used.
The utility model has the advantages that:
1. the utility model provides a 2 The concentration measuring device reduces the length of the air section and reduces O in the air section by arranging the filling section between the convergent lens and the receiver 2 The interference to the measuring result of the measuring device ensures the accuracy and precision of the measuring result of the measuring device.
2. The utility model provides a 2 The concentration measuring device is provided with a first on-off valve and a second on-off valve for ensuring the tightness of the measured pipeline, and before the transmitting unit and the receiving unit are maintained, the connection between the inside and the outside of the measured pipeline is cut off through the first on-off valve and the second on-off valve, so that gas leakage is avoided when the transmitting unit and the receiving unit are disassembled.
3. In the operation of the measuring device, because the continuous existence of the vibration phenomenon of the measuring device per se can cause the phenomenon of light deflection, the utility model provides an O 2 The concentration measuring device reduces the light deflection phenomenon in operation by increasing the area of the convergent lens, thereby reducing the maintenance times of the measuring device.
4. The large-pipe-diameter flue gas pipeline installation measuring device is installed in a normal-temperature state without working, after the device starts to operate, the temperature rises, the joint of the flue gas pipeline and the measuring device is often subjected to mechanical deformation, so that measured data is abnormal, light adjustment needs to be carried out again, and a converging lens is small and high in light adjustment difficulty; the utility model provides a 2 The concentration measuring device increases the radius of the converging lens, so that the light focusing is simpler, and the light deflection phenomenon is not easy to occur when the measuring device moves.
Drawings
FIG. 1 is a schematic diagram of a prior art converging lens to receiver spacing;
in fig. 1, 01, a converging lens; 02. a receiver; 03. an air section;
FIG. 2 is a cross-sectional structural view of an embodiment of the present invention;
fig. 3 is a schematic diagram illustrating the distance between the collecting lens, the filling section and the receiver according to an embodiment of the present invention.
In fig. 2 and 3, 1, a converging lens; 2. a receiver; 3. a first flange; 4. a filling section; 5. a pipe to be tested; 6. a laser transmitter; 7. a collimating mirror; 8. a second on-off valve; 9. a second flange; 10. a first on-off valve.
Detailed Description
To make the objects, advantages and features of the present invention clearer, the following description is given with reference to the accompanying drawings and specific embodiments of the present invention 2 The concentration measuring apparatus is described in further detail.
Referring to FIG. 1, conventional O 2 The diameter of a plane end of a convergent lens 01 in the concentration measuring device is 25.4mm, the effective diameter of the convergent lens 01 is 25mm, the curvature radius of a spherical end is 18.3mm, an air section 03 of 30mm is arranged between the convergent lens 01 and a receiving end of a receiver 02, due to the existence of the air section 03, the measuring result of the measuring device has deviation, and O in a measured pipeline 5 is arranged 2 When the concentration is low, the deviation is particularly obvious, and because the area of the plane end of the convergent lens 01 is small, the light is difficult to focus, and the light focusing efficiency is low.
Referring to fig. 2 and 3, the present invention provides an O 2 Concentration measurement device has solved above-mentioned defect, specifically is:
the utility model comprises a transmitting unit and a receiving unit;
the transmitting unit and the receiving unit are respectively arranged on two opposite sides of the pipeline 5 to be detected; the emitting unit is used for emitting laser, and the emitting direction of the laser is vertical to the flowing direction of the gas in the measured pipeline 5; the laser emitted by the emitting unit is received by the receiving unit after passing through the gas in the measured pipeline 5;
the concrete composition and connection mode of each part are as follows:
the emission unit includes laser emitter 6, collimating mirror 7, second break-make valve 8 and second flange 9, laser emitter 6, collimating mirror 7, second break-make valve 8 sets gradually along laser outgoing direction, and install on being surveyed pipeline 5 through second flange 9, laser emitter 6 is used for transmitting laser, collimating mirror 7, second break-make valve 8 sets gradually on second flange 9 along laser outgoing direction, consider size and simple to operate, only need to install laser emitter 6's transmitting terminal on second flange 9, collimating mirror 7 is used for collimating the laser that laser emitter 6 launches.
The laser emitter 6 emits laser light with a wavelength of 763nm or 760nm, and currently 763nm is used mostly.
The receiving unit comprises a converging lens 1, a receiver 2, a first on-off valve 10, a filling section 4 and a first flange 3; the first on-off valve 10, the convergent lens 1, the filling section 4 and the receiver 2 are sequentially arranged along the laser emission direction and are installed on the measured pipeline 5 through a first flange 3; considering the size and the ease of installation, it is only necessary to mount the receiving end of the receiver 2 on the first flange 3;
the filling section 4 is made of glass, the front end of the filling section 4 is attached to the converging lens 1, and a gap of 2mm is formed between the rear end of the filling section 4 and the receiver 2;
the spherical curvature radius of the convergent lens 1 is 35mm, the diameter of the plane end of the convergent lens 1 is 75mm, the effective diameter of the convergent lens is 70mm, in order to ensure that the receiver 2 receives all optical fibers emitted by the convergent lens 1, the diameter of the plane end of the convergent lens 1 is the same as that of the filling section 4, and the diameter of the filling section 4 is 78mm.
The utility model discloses in the effective area and the current O of 1 plane end of lens that assembles 2 The effective area ratio of the plane end of the converging lens 1 in the concentration measuring device is 7.8, the difficulty of light focusing is reduced by increasing the effective area, and the possibility of polarized light is reduced.
The utility model discloses a measurement principle does:
the first on-off valve 10 and the second on-off valve 8 are opened, the laser emitter 6 emits laser with the wavelength of 763nm, the laser is collimated by the collimating mirror 7, enters the gas in the measured pipeline 5 and passes through O in the measured pipeline 5 2 After absorption, the light enters the converging lens 1, is converged by the converging lens 1, passes through the filling section 4 and is received by the receiver 2, the receiver 2 processes the received optical signal,to obtain O 2 Concentration data;
the specific treatment process is as follows:
the optical signal is converted into a continuous electric signal, the second harmonic is demodulated by a phase-locked amplifier, the maximum value of the second harmonic is collected by a collection program, the harmonic size and the concentration size are in a direct proportion relation, and finally the concentration value is converted.
Claims (8)
1. O-shaped catalyst 2 The concentration measuring device comprises a transmitting unit and a receiving unit;
the transmitting unit and the receiving unit are respectively arranged on two opposite sides of the pipeline (5) to be detected; the emitting unit is used for emitting laser, and the emitting direction of the laser is vertical to the flowing direction of gas in the measured pipeline (5); the laser emitted by the emitting unit is received by the receiving unit after passing through the gas in the tested pipeline (5);
the receiving unit comprises a converging lens (1), a receiver (2) and a first flange (3);
the method is characterized in that:
also comprises a filling section (4);
the converging lens (1), the filling section (4) and the receiver (2) are sequentially arranged along the laser receiving direction and are installed on the detected O through the first flange (3) 2 A circulating pipeline (5);
the filling section (4) is made of transparent materials, the front end of the filling section is attached to the converging lens (1), and a gap of 2-3mm is formed between the rear end of the filling section and the receiver (2);
the filling section (4) and the converging lens (1) are coaxially arranged.
2. O according to claim 1 2 Concentration measurement device, its characterized in that:
the emission unit comprises a laser emitter (6), a collimating mirror (7) and a second flange (9);
the laser emitter (6) is used for emitting laser;
laser emitter (6) and collimating mirror (7) all install on being surveyed pipeline (5) through second flange (9), and collimating mirror (7) are located the emergent light way of laser.
3. O according to claim 2 2 Concentration measurement device, its characterized in that:
the filling section (4) is made of glass.
4. O according to claim 3 2 Concentration measurement device, its characterized in that:
the curvature radius of the convergent lens (1) is 35mm, the diameter of the plane end of the convergent lens (1) is 75mm, and the diameter of the filling section (4) is 78mm.
5. O according to claim 4 2 Concentration measurement device, its characterized in that:
the receiving unit further comprises a first on-off valve (10);
the first on-off valve (10) is used for controlling the on-off of the receiving unit and the air flow in the tested pipeline (5);
the first on-off valve (10) is installed on the first flange (3) and is arranged at the front end of the converging lens (1) along the laser receiving direction.
6. O according to any one of claims 2 to 5 2 Concentration measurement device, its characterized in that:
the emission unit further comprises a second on-off valve (8);
the second on-off valve (8) is used for controlling the on-off of the air flow between the emission unit and the interior of the pipeline to be detected (5);
and the second on-off valve (8) is arranged on the second flange (9) and is arranged at the rear end of the collimating mirror (7) along the laser emission direction.
7. O according to claim 6 2 Concentration measurement device, its characterized in that:
a gap of 2mm is arranged between the rear end of the filling section (4) and the receiver (2).
8. According to claim 7A described one 2 Concentration measurement device, its characterized in that:
the laser emitter (6) emits laser with wavelength of 760nm or 763nm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221680929.XU CN217786891U (en) | 2022-06-30 | 2022-06-30 | O2 concentration measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221680929.XU CN217786891U (en) | 2022-06-30 | 2022-06-30 | O2 concentration measuring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217786891U true CN217786891U (en) | 2022-11-11 |
Family
ID=83937606
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221680929.XU Active CN217786891U (en) | 2022-06-30 | 2022-06-30 | O2 concentration measuring device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217786891U (en) |
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2022
- 2022-06-30 CN CN202221680929.XU patent/CN217786891U/en active Active
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