CN209821053U - Device for detecting SO2 gas in atmosphere by photoacoustic spectroscopy - Google Patents
Device for detecting SO2 gas in atmosphere by photoacoustic spectroscopy Download PDFInfo
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- CN209821053U CN209821053U CN201920680375.5U CN201920680375U CN209821053U CN 209821053 U CN209821053 U CN 209821053U CN 201920680375 U CN201920680375 U CN 201920680375U CN 209821053 U CN209821053 U CN 209821053U
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- photoacoustic
- photoacoustic cell
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Abstract
The utility model discloses a gaseous detection device of SO2 in photoacoustic spectroscopy atmosphere, including light source subassembly, photoacoustic cell, sensor and display, the light source subassembly is connected with photoacoustic cell, and photoacoustic cell one end intercommunication has the intake pipe, and the other end intercommunication has the outlet duct, and the sensor sets up on photoacoustic cell's lateral wall, and is connected with the display electricity; the light source assembly comprises a concave mirror, a point light source, a modulation disc and a light filter, wherein the point light source, the modulation disc and the light filter are sequentially arranged in front of the concave mirror; the modulation disc rotates, light with changed intensity is filtered out and enters the photoacoustic cell and contacts with SO2 gas to send out signals, and the sensor receives the signals and transmits the signals to the display; the utility model discloses a detection data is more stable, and the precision is higher.
Description
Technical Field
The utility model relates to a gaseous detection device especially relates to a gaseous detection device of SO2 in optoacoustic spectrum atmosphere.
Background
Most of the existing gas detection devices are SO2 gas detection devices in photoacoustic spectroscopy atmosphere, and by emitting light with periodically changing intensity onto SO2 gas, the SO2 gas receives illumination and absorbs light energy to generate local thermal expansion SO as to realize local thermal expansionThe mode of releasing heat energy is deactivated, the released heat energy heats SO2 gas according to the period of light intensity, thereby causing the medium to generate periodic pressure fluctuation, the pressure fluctuation can be detected by a sensitive microphone or a piezoelectric ceramic microphone, and the photoacoustic signal can be obtained by amplification. However, in the existing device for detecting SO2 gas in photoacoustic spectroscopy atmosphere, the optical signal transmitted by the light source is unstable, SO that the generated data has high fluctuation, and the detection is not accurate, especially for SO-like gas2If the detection of the gas with strong hazard is not accurate enough, the safety requirement is difficult to ensure.
SUMMERY OF THE UTILITY MODEL
In order to overcome the problem that the conventional photoacoustic spectroscopy gas detection device is not high in accuracy, a stable and high-accuracy photoacoustic spectroscopy gas detection device for SO2 in the atmosphere is provided.
In order to achieve the above object, the utility model provides a following technical scheme:
a photoacoustic spectroscopy atmosphere SO2 gas detection device comprises a light source assembly, a photoacoustic cell, a sensor, a control panel and a display, wherein the light source assembly is connected with the photoacoustic cell, one end of the photoacoustic cell is communicated with an air inlet pipe, the other end of the photoacoustic cell is communicated with an air outlet pipe, the sensor is arranged on the side wall of the photoacoustic cell, and the control panel is respectively and electrically connected with the display and the sensor; the light source assembly comprises a concave mirror, a point light source, a modulation disc and a light filter, wherein the point light source, the modulation disc and the light filter are sequentially arranged in front of the concave mirror; the modulating disk adjusts the rotating speed through the speed measuring grid, then the filtered light with changed intensity enters the photoacoustic cell and contacts with SO2 gas to send out signals, and the sensor receives the signals and transmits the signals to the control panel.
Wherein, one side of the grid that tests the speed is provided with the photoelectric sensor who is connected with the control panel electricity, and the scattered light of pointolite passes the grid that tests the speed and shines photoelectric sensor on, and the control panel still is connected with the rotation motor.
Wherein, include the filter hole of multiple different colours on the filter, and the filter is connected with the accommodate motor who drives the filter motion, and then the filter hole of different colours all can communicate with the transparent window.
The photoacoustic cell light source assembly comprises a photoacoustic cell, a light source assembly, a concave mirror, a point light source, a modulation disk and a light filter, wherein the photoacoustic cell light source assembly further comprises a sound insulation bin for accommodating the photoacoustic cell, the light source assembly further comprises a shell for accommodating the concave mirror, the point light source, the modulation disk and the light filter, and the sound insulation bin.
Wherein the point light source includes a laser light source.
Wherein, the outlet duct is provided with a flowmeter, and the flowmeter is also connected with a control panel.
Wherein, be provided with the aspiration pump in the intake pipe, the aspiration pump is connected with the control panel electricity.
The photoacoustic imaging device further comprises a main shell for accommodating the light source assembly, the photoacoustic cell and the sensor, wherein a face shell is arranged at the top of the main shell, and a display window for fixing the display, an air inlet connected with the air inlet pipe, an air outlet connected with the air outlet pipe and a key connected with the control board are arranged on the face shell.
Wherein, the face-piece still is provided with the thermovent, and thermovent and the inside intercommunication of main casing, thermovent department are provided with the radiator.
Wherein, the face-piece is also provided with a USB interface, and the display is electrically connected with an external computer through the USB interface.
The utility model has the advantages that: compared with the prior art, the utility model discloses a set up the grid that tests the speed of even and closely arranging at the edge all around of modulation dish, can record the slew velocity of modulation dish to carry out slight regulation to the rotational speed of modulation dish, weaken the error that the fluctuation of automatically controlled spare self brought, guarantee that the light signal of transfering is more stable, and then improve the accuracy of test SO2 content. The speed measuring device is characterized in that a control panel is further arranged, a photoelectric sensor electrically connected with the control panel is arranged on one side of the speed measuring grid, divergent light rays of the point light source penetrate through the speed measuring grid to irradiate the photoelectric sensor, and the photoelectric sensor receives optical signals to measure the rotating speed of the modulation disc.
Drawings
Fig. 1 is an exploded view of the present invention;
fig. 2 is an exploded view of the light source assembly of the present invention;
fig. 3 is a schematic structural diagram of the present invention;
fig. 4 is a schematic diagram of the optical filter structure of the present invention;
fig. 5 is a schematic diagram of the structure of the reticle of the present invention;
fig. 6 is an overall schematic diagram of the present invention.
Description of the main elements
1. Light source assembly 2 and air guide assembly
3. Photoacoustic cell 4 and display
5. Radiator 6, main casing
7. Face shell 8 and sound insulation bin
11. Point light source 12 and modulation disk
13. Optical filter 14 and housing
21. Air inlet pipe 22 and air outlet pipe
23. Air pump 121 and rotary motor
122. Velocity measurement grid 123 and light through hole
131. Adjusting motor 132, filter hole.
Detailed Description
In order to more clearly illustrate the technical solutions in the present technology, the drawings used in the description of the embodiments or the prior art will be described below.
Referring to fig. 1 and fig. 2, the present embodiment provides a device for detecting SO2 gas in photoacoustic spectroscopy atmosphere, including a light source assembly 1, a photoacoustic cell 3, a sensor, a control panel and a display 4, where the light source assembly 1 is connected to the photoacoustic cell 3, one end of the photoacoustic cell 3 is connected to an air inlet pipe 21, and the other end is connected to an air outlet pipe 22, the air inlet pipe 21 and the air outlet pipe 22 are used as air guide assemblies 2, a sound pickup used as a sensor is disposed on a side wall of the photoacoustic cell 3, the control panel is electrically connected to the sensor and the display 4, respectively, a is an incident light path emitted by a light source, incident light a emitted by the light source assembly 1 and having periodically changing intensity enters the photoacoustic cell 3, SO2 gas in the photoacoustic cell 3 receives a periodically changing intensity a sound signal, and the incident light receives the sound signal and transmits the sound signal to the; the light source assembly 1 comprises a concave mirror, a point light source 11, a modulation disc 12 and a light filter 13 which are sequentially arranged in front of the concave mirror, a transparent window is arranged on the side wall of the photoacoustic cell 3, a plurality of light through holes 123 communicated with the transparent window are arranged on the modulation disc 12, the center of the modulation disc 12 is connected with a rotating motor 121, the modulation disc 12 is driven to rotate along with the rotating motor 121, only when the light source, the light through holes 123 and the transparent window are in a line, the incident light A can be emitted into the photoacoustic cell 3, the heat in the photoacoustic cell 3 is strongest at the moment, when the incident light A is not emitted into the light through holes 123, the incident light A can be blocked by the modulation disc 12, the heat in the photoacoustic cell 3 is weakest at the moment, the heat is converted into sound signals, and the sound; and the peripheral edge of the modulation disk 12 is provided with the velocity measurement grids 122 which are uniformly and closely arranged, so that the rotating speed of the modulation disk 12 can be measured, the rotating speed of the modulation disk 12 can be finely adjusted, errors caused by the fluctuation of the electric control part can be weakened, the transmitted optical signals are more stable, and the data accuracy is improved.
Referring to fig. 2 and 5, a photoelectric sensor electrically connected to the control board is disposed on one side of the velocity measurement grid 122 of the embodiment, the divergent light of the point light source 11 passes through the velocity measurement grid 122 and irradiates the photoelectric sensor, the control board is further connected to the rotating motor 121, as the modulation board 12 rotates, the velocity measurement grid 122 also rotates and sequentially passes through the photoelectric sensor, the photoelectric sensor receives a fluctuating optical signal and transmits the fluctuating optical signal to the control board, and then the rotating speed of the modulation board 12 is measured, and meanwhile, the control board adjusts the output power of the rotating motor 121, so as to weaken the error caused by the fluctuation of the electric control part, so that the transmitted signal is more stable, and the accuracy of the data is further improved.
Referring to fig. 2 and 4, the optical filter 13 of the present embodiment includes a plurality of filter holes 132 with different colors, the optical filter 13 is connected to an adjusting motor 131, the adjusting motor 131 drives the optical filter 13 to move, and further the filter holes 132 with different colors can be communicated with the transparent window, so that the optical filters 13 with different colors can be selected to adjust the frequency of the incident light a, and the frequency of the incident light a can be detected, thereby having a wider application range; referring to fig. 3, the present embodiment further includes a sound insulation bin 8 for accommodating the photoacoustic cell 3, the light source assembly further includes a housing 14 for accommodating the concave mirror, the point light source, the modulation panel and the optical filter, the sound insulation bin is connected to the housing 14, and the sound insulation bin 8 is accommodated in the main housing 6, so that the signal interference of external sound to the inside of the photoacoustic cell 3 is reduced, and the accuracy of the test data is improved; the point light source 11 of the present embodiment includes a laser light source or other light sources, when the laser light source is used, laser light emitted from the light source is modulated into laser light of a fixed period through the rotating modulation disk 12, different frequencies are selected through the optical filter 13, and the laser light is finally guided into the photoacoustic cell 3 to generate a signal, so that the intensity of the signal generated in the photoacoustic cell 3 can be improved by using the laser light source, characteristic peaks in a data analysis graph displayed by the display 4 are enlarged, and the accuracy of data is enhanced.
Referring to fig. 1 and 3, the air intake pipe 21 of the present embodiment is provided with the air pump 23, and the SO2 gas is actively extracted by disposing the air pump 23 on the air intake pipe 21; the gas outlet pipe 22 of the embodiment is provided with a flowmeter, the flowmeter is also connected with a control board, the gas flow rate can be observed through the flowmeter to regulate and control the gas inlet speed, and the measured data is ensured to reduce signal fluctuation caused by gas pressure change under a normal and stable state; with reference to fig. 6, the present embodiment further includes a main housing 6 for accommodating the light source assembly 1, the photoacoustic cell 3, and the sensor, the top of the main housing 6 is provided with a face housing 7, the face housing 7 is provided with a display window for fixing the display 4, an air inlet connected to the air inlet pipe 21, an air outlet connected to the air outlet pipe 22, and a key connected to the control board, and the main housing 6 and the face housing 7 are provided with accommodating parts, so that an integral portable effect can be achieved; the face shell 7 of the embodiment is also provided with a heat dissipation port, the heat dissipation port is communicated with the interior of the main shell 6, and the heat dissipation port is provided with a radiator 5 to enhance the heat dissipation effect in the device; the face shell 7 of this embodiment is further provided with a USB connector, and the display 4 is electrically connected to an external computer through the USB connector, so that the computer can be directly used for further data analysis.
The utility model has the advantages that:
(1) the speed measuring grid is arranged on the modulation disc, so that the rotating speed of the modulation disc can be measured, the rotating speed of the modulation disc is finely adjusted, errors caused by fluctuation of the electric control part are weakened, transmitted optical signals are more stable, and the data accuracy is improved;
(2) a photoelectric sensor is arranged on one side of the speed measuring grid, divergent light rays of the point light source penetrate through the speed measuring grid and irradiate onto the photoelectric sensor, the rotating speed of the modulation disc is measured, meanwhile, the control panel adjusts the output power of the rotating motor, and errors caused by the fluctuation of the electric control part are weakened, so that transmitted signals are more stable, and the data precision is further improved;
(3) the light source component is externally provided with a sound insulation bin, the sound insulation bin can effectively reduce the interference of external sound signals, and the accuracy of test data is improved.
The above disclosure is only one or several specific embodiments of the present invention, but the present invention is not limited thereto, and any changes that can be made by those skilled in the art should fall within the protection scope of the present invention.
Claims (10)
1. The device for detecting SO2 gas in photoacoustic spectroscopy atmosphere is characterized by comprising a light source assembly, a photoacoustic cell, a sensor, a control panel and a display, wherein the light source assembly is connected with the photoacoustic cell, one end of the photoacoustic cell is communicated with an air inlet pipe, the other end of the photoacoustic cell is communicated with an air outlet pipe, the sensor is arranged on the side wall of the photoacoustic cell, and the control panel is respectively and electrically connected with the display and the sensor;
the light source assembly comprises a concave mirror, a point light source, a modulation disc and a light filter, the point light source, the modulation disc and the light filter are sequentially arranged in front of the concave mirror, the photoacoustic cell is provided with a transparent window, the modulation disc is provided with a light through hole communicated with the transparent window, the center of the modulation disc is connected with a rotating motor, and the peripheral edge of the modulation disc is provided with uniform and closely-arranged speed measuring grids;
the modulation disc adjusts the rotating speed through the speed measurement of the speed measurement grid, light with changed filtering intensity enters the photoacoustic cell and contacts with SO2 gas to send out signals, and the sensor receives the signals and transmits the signals to the control panel.
2. The photoacoustic spectroscopy atmospheric SO2 gas detection apparatus according to claim 1, wherein the velocity grid is provided at one side thereof with a photosensor electrically connected to the control board, the divergent light of the point light source passes through the velocity grid and is irradiated onto the photosensor, and the control board is electrically connected to the rotating motor.
3. The photoacoustic spectroscopy apparatus for detecting SO2 in atmosphere according to claim 1, wherein the filter includes a plurality of filter holes of different colors, and the filter is connected to a control motor for driving the filter to move, SO that the filter holes of different colors can be connected to the transparent window.
4. The photoacoustic spectroscopy atmospheric SO2 gas detection apparatus of claim 1, further comprising a sound-proof chamber housing the photoacoustic cell, wherein the light source assembly further comprises a housing the concave mirror, the point light source, the chopper wheel and the optical filter, and wherein the sound-proof chamber is connected to the housing.
5. The photoacoustic spectroscopy apparatus for detecting SO2 gas in an atmosphere according to claim 1, wherein the point light source comprises a laser light source.
6. The photoacoustic spectroscopy apparatus for detecting SO2 in atmosphere according to claim 1, wherein a flow meter is disposed on the gas outlet pipe, and the flow meter is further connected to the control board.
7. The photoacoustic spectroscopy apparatus for detecting SO2 in atmosphere according to claim 2, wherein a suction pump is disposed on the air inlet tube, and the suction pump is electrically connected to the control board.
8. The photoacoustic spectroscopy apparatus for detecting SO2 in atmosphere according to claim 2, further comprising a main housing for accommodating the light source assembly, the photoacoustic cell, and the sensor, wherein a top of the main housing is provided with a face housing, and the face housing is provided with a display window for fixing the display, an air inlet connected to the air inlet pipe, an air outlet connected to the air outlet pipe, and a button connected to the control board.
9. The photoacoustic spectroscopy apparatus for detecting SO2 gas in an atmosphere according to claim 8, wherein the face housing is further provided with a heat sink, the heat sink communicating with the interior of the main housing, and the heat sink is provided with a heat sink.
10. The photoacoustic spectroscopy apparatus for detecting SO2 in atmosphere according to claim 8, wherein the front cover further comprises a USB connector, and the display is electrically connected to an external computer through the USB connector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920680375.5U CN209821053U (en) | 2019-05-14 | 2019-05-14 | Device for detecting SO2 gas in atmosphere by photoacoustic spectroscopy |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920680375.5U CN209821053U (en) | 2019-05-14 | 2019-05-14 | Device for detecting SO2 gas in atmosphere by photoacoustic spectroscopy |
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| Publication Number | Publication Date |
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| CN209821053U true CN209821053U (en) | 2019-12-20 |
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| CN201920680375.5U Active CN209821053U (en) | 2019-05-14 | 2019-05-14 | Device for detecting SO2 gas in atmosphere by photoacoustic spectroscopy |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114235711A (en) * | 2022-02-24 | 2022-03-25 | 朗思传感科技(深圳)有限公司 | Miniaturized portable high-sensitivity gas measurement system |
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2019
- 2019-05-14 CN CN201920680375.5U patent/CN209821053U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114235711A (en) * | 2022-02-24 | 2022-03-25 | 朗思传感科技(深圳)有限公司 | Miniaturized portable high-sensitivity gas measurement system |
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