CN111579443A - Method for controlling a sensor device - Google Patents
Method for controlling a sensor device Download PDFInfo
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- CN111579443A CN111579443A CN202010092741.2A CN202010092741A CN111579443A CN 111579443 A CN111579443 A CN 111579443A CN 202010092741 A CN202010092741 A CN 202010092741A CN 111579443 A CN111579443 A CN 111579443A
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- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000010926 purge Methods 0.000 claims abstract description 82
- 238000005259 measurement Methods 0.000 claims abstract description 52
- 238000009423 ventilation Methods 0.000 claims abstract description 30
- 238000000746 purification Methods 0.000 claims abstract description 19
- 238000012360 testing method Methods 0.000 claims abstract description 19
- 230000003287 optical effect Effects 0.000 claims description 26
- 239000000428 dust Substances 0.000 claims description 14
- 230000001105 regulatory effect Effects 0.000 claims description 9
- 238000004140 cleaning Methods 0.000 claims description 6
- 230000001276 controlling effect Effects 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims 1
- 238000002360 preparation method Methods 0.000 claims 1
- 239000000523 sample Substances 0.000 description 157
- 239000003570 air Substances 0.000 description 34
- 239000002245 particle Substances 0.000 description 26
- 238000011161 development Methods 0.000 description 11
- 238000000151 deposition Methods 0.000 description 4
- 239000012080 ambient air Substances 0.000 description 3
- 230000008021 deposition Effects 0.000 description 3
- 239000011241 protective layer Substances 0.000 description 3
- 239000012521 purified sample Substances 0.000 description 3
- 238000011109 contamination Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- -1 through the filter Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/06—Investigating concentration of particle suspensions
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/2202—Devices for withdrawing samples in the gaseous state involving separation of sample components during sampling
- G01N1/2205—Devices for withdrawing samples in the gaseous state involving separation of sample components during sampling with filters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/34—Purifying; Cleaning
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/06—Investigating concentration of particle suspensions
- G01N15/075—Investigating concentration of particle suspensions by optical means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N2015/0042—Investigating dispersion of solids
- G01N2015/0046—Investigating dispersion of solids in gas, e.g. smoke
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
- G01N33/0029—Cleaning of the detector
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- Health & Medical Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Pathology (AREA)
- General Physics & Mathematics (AREA)
- Physics & Mathematics (AREA)
- Immunology (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Molecular Biology (AREA)
- Biomedical Technology (AREA)
- Engineering & Computer Science (AREA)
- Dispersion Chemistry (AREA)
- Sampling And Sample Adjustment (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
- Optical Measuring Cells (AREA)
Abstract
The invention relates to a method for controlling a sensor device for testing a sample gas volume, wherein a sample gas volume to be tested is introduced into a measurement space, the invention essentially provides that a volume fraction of the tested sample gas volume is branched off from a sample gas outlet via a gas-conducting connection and fed to a purification device, the volume fraction fed to the purification device is purified in the purification device, and the purified volume fraction is fed as purified gas into the measurement space. A further aspect of the invention relates to a sensor device for checking a sample gas volume, having at least one measuring chamber, at least one sample gas inlet and at least one sample gas outlet, wherein the invention essentially provides that at least one purge gas inlet is associated with the measuring chamber, that a ventilation unit is associated with the sample gas inlet, the sample gas outlet and the purge gas inlet, and that the sample gas outlet has a flow rate control device.
Description
Technical Field
The invention relates to a method for controlling a sensor device for testing a sample gas volume, wherein the sample gas volume to be tested is introduced in the form of a gas flow through a sample gas inlet into a measurement space, wherein the sample gas volume to be tested is tested in the measurement space, wherein the tested sample gas volume is conducted from the measurement space through a ventilation device further into a sample gas outlet. The invention further relates to a sensor device for checking a sample gas volume, in particular for detecting the fine dust content of a sample gas volume, which sensor device: at least one measuring space for receiving a sample gas to be tested is provided, at least one sample gas inlet associated with the measuring space is provided, and at least one sample gas outlet associated with the measuring space is provided.
Background
Sensor devices for detecting gas volumes, in particular for detecting fine dust, are used in many fields of application, such as in the automotive field. The sensor device can be used, for example, to check the fine dust content of a sample gas volume or of a sample gas volume flow. For this purpose, the sensor device has at least one measuring space in which a sample gas volume can be checked. The sample gas may be, for example, the ambient air of the vehicle, the fine dust content of which is checked in order to determine, for example, whether it is expedient to ventilate the vehicle interior with ambient air. The sample gas volume can be fed into the measurement space via a sample gas feed, in particular via a sample gas feed line. After the analysis, the sample gas volume can be derived from the measurement space via the sample gas output. For the examination, a laser source can be used, for example, which irradiates the sample gas volume in the measurement space. The fine dust content contained in the sample volume can be inferred from the reflection and scattering of the incident laser light.
One challenge in operating the measurement space is that dust particles contained in the sample gas volume to be examined or in the gas flow to be examined can accumulate in the measurement space and can contaminate the optical elements required for detecting dust particles. In order to flush away dirt particles, the measurement space can be flushed, for example, with a gas flow with clean, i.e. without particle-laden gas, for example clean air. For this purpose, it is often necessary to additionally provide a purge gas feed for this purpose with its own ventilation unit. The sample gas volume provided as purge gas can, for example, be taken from the environment of the sensor device and purged before use. When such sensor devices are used in the automotive field, the small dimensions of the sensor devices are required, so that the use of an additional ventilation unit for the purging gas feed is problematic. Furthermore, additional costs are incurred due to the arrangement of additional ventilation units.
Disclosure of Invention
The object of the present invention is to provide a sensor device of the type mentioned at the outset and a method for controlling the sensor device, in which the deposition of particles is minimized and in which an additional ventilation unit provided for the clean air inlet can be dispensed with.
This object is achieved by a method according to claim 1 and a sensor device according to claim 6. The development and the advantageous embodiments are specified in the dependent claims.
The invention essentially provides that a volume fraction of the sample gas volume to be tested is branched off from the sample gas outlet via a gas-conducting connection and fed to a purification device, the volume fraction fed to the purification device being purified in the purification device and the purified volume fraction being fed as purified gas to the measurement space.
The sensor device may have a measuring space in which the sample gas volume to be examined is examined. For this purpose, the sample gas volume introduced into the measurement space in the form of a sample gas flow can be irradiated with laser light, for example, by means of a laser light source, wherein the laser light is scattered and reflected on particles located in the sample gas volume. The light scattered and reflected on the particles can be detected by means of an optical element, for example by means of a photodiode. From the scattered light detected, for example, a particle concentration, in particular a fine dust concentration of the examined sample gas volume, can be inferred. For testing, a sample gas volume to be tested, for example from the environment of the motor vehicle in which the sensor device is used, is introduced into the measuring space via the sample gas inlet in the form of a gas stream. The sample gas inlet may be a pipe, for example. The volume of sample gas to be examined is analyzed in the measurement space. The sample gas volume to be examined is sucked out through the measuring space by the ventilation device, so that a sample gas flow is generated. The volume of the sample gas to be tested is fed to the sample gas outlet after the testing in the measuring space. The examination of the sample gas flow in the measurement space can be carried out continuously. The sample gas outlet can be a line which again outputs the examined sample gas volume to the environment. The purge air input portion is arranged to branch from the sample gas output portion. The purge air inlet can be a line which branches off from the sample gas outlet, for example, via a T-piece. The volume fraction of the test sample gas flow entering the clean air inlet is fed to the cleaning device via a line. The purification device can be a filter device in which the sample gas, which has been tested and is loaded with particles, is purified. The purification device may, for example, be a filter stage through which the sample gas flow is guided and thus freed of particles, so that the purified gas can be used as a purification gas. The cleaned gas is introduced into the measurement space for cleaning the optical element. The sensor device may be controlled, for example, using a control device. By using the already tested air flow as purge air, i.e. by forming a circuit and by branching off the purge air from the sample gas outlet, it is possible to use only one ventilation device for sucking the sample gas to be tested into the measurement space, so that the tested sample gas can be output and the purge air can be supplied into the measurement space. Thus, components can be reduced and thus costs can be saved.
In a further development of the method, the volume fraction fed to the purification device can be adjusted by means of a flow rate control device of the sample gas outlet. A flow rate control device, which may be formed, for example, by a shut-off valve, may be arranged in the sample gas outlet. The flow rate of the sample gas to be tested through the line of the sample gas outlet can be adjusted by the flow rate adjusting device. The smaller the flow rate, i.e. the volume of gas flowing through per unit time, the greater the volume fraction, i.e. the flow fraction, of the sample gas that has been tested, which enters the purge gas inlet via the connection of the sample gas outlet. Depending on how much purge air is required, the flow regulating device can therefore be set to produce a purge gas flow of the desired intensity. The flow regulating means may be operated, for example, using a control device.
In a development of the method, the purification device is a filter device. The purification device for purifying the sample gas to be tested can be a filter device through which the sample gas flow to be tested or a corresponding branched volume fraction is conducted in the measurement space. By conducting the sample gas, in particular the sample air, through the filter, particles present in the sample gas are filtered out, so that the filtered sample air can be used as clean air.
In a further development of the method, the purified sample gas volume in the measurement space is guided as a gas flow along an optical element arranged in the measurement space. The purge gas volume introduced into the measuring space, which is provided for purging, is introduced into the measuring space in such a way that it flows along the optical element to be purged. An effective cleaning of the optical component, in particular of particle deposits from the particle-laden air, is thus achieved.
In a development of the method, the purified sample gas volume in the measurement space is guided as a gas flow between the sample gas to be examined and the optical element. A volume of purified sample gas serving as purge air is introduced into the measurement space in the form of a gas flow such that a purge gas flow is guided between the sample gas flow and the optical element. The purge gas flow thus forms a protective layer between the particle-guiding sample gas and the optical element to be protected. The purge gas stream serves as an encapsulating gas for encapsulating the sample gas stream. Thus minimizing the deposition of e.g. dust particles on the optical element.
In a development of the method, the purge gas flow has a higher flow velocity than the sample gas flow to be tested. The purge gas flow is introduced into the measurement space in such a way that it at least partially surrounds the sample gas flow to be tested, like the enveloping air flow. Particles from the sample gas flow are thereby prevented from settling on the inner wall portion of the measurement space and on the optical elements of the measurement space. The encapsulated purge gas flow has a higher flow velocity than the encapsulated sample gas flow. It is thereby ensured that particles from the sample gas flow are carried away by the enclosed purge gas flow and do not settle in the measurement space. The flow rate of the encapsulated purge gas stream can be controlled here, for example, by means of a flow rate regulating device.
A further aspect of the invention relates to a sensor device for testing a sample gas volume, in particular for detecting the fine dust content of a sample gas volume, having at least one measuring chamber for receiving a sample gas to be tested, having at least one sample gas inlet assigned to the measuring chamber and having at least one sample gas outlet assigned to the measuring chamber, wherein the invention essentially provides that at least one purge gas inlet is assigned to the measuring chamber, that a ventilation unit is assigned to the sample gas inlet, the sample gas outlet and the purge gas inlet, and that the sample gas outlet has a flow rate regulation device. A measuring space, in which the sample gas volume to be measured is accommodated, is assigned a sensor device, which has, for example, a laser source and a sensor element, in particular a light-emitting diode, for optically detecting the laser light. The sample gas present in the measurement space, i.e. the gas or gas mixture to be examined, is irradiated with laser light by a laser light source, wherein the laser light scattered on dust particles present in the sample gas volume can be detected by means of a sensor element. For the input of a sample gas, in particular ambient air, the sensor device has a sample gas input, which can be formed, for example, by an input line. A sample gas outlet, which may be formed by an outlet line, is accordingly assigned to the measuring space for the purpose of discharging the analyzed sample gas. Furthermore, a clean air inlet, in particular an encapsulation air inlet, is associated with the measuring space, through which clean gas can be introduced into the measuring space in order to prevent contamination of the measuring space, the optical elements or the like, for example, due to the deposition of fine dust particles. For the control, a control device can be assigned to the sensor device. A common ventilation unit is associated with the measurement space, the purge gas inlet, and the sample gas inlet and outlet. The ventilation unit can be arranged, for example, in such a way that the sample gas to be examined is drawn through the measurement space in the form of a sample gas flow through the ventilation unit through the sample gas inlet. In order to output the test sample gas, a sample gas output is arranged behind the ventilation unit in the flow direction of the sample gas. The sample gas output may consist essentially of a tube. The sample gas output can be used to output the tested sample gas, for example, to the surroundings of the vehicle. A purge gas inlet can be arranged from the sample gas outlet. The sample gas outlet can in particular have a branching structure in the region behind the ventilation unit, from which branching structure the purified air inlet, which is partially designed as a line, branches off. The purified air inlet leads from the branching structure of the sample gas outlet to a purification device, in particular a filter device, in which the sample gas, in particular the test air, can be purified. In particular, particles in the test air can be filtered out by the filter device, so that the test air is used as purified air. The branching structure of the purge gas feed is arranged downstream of the ventilation unit in the flow direction of the sample gas, i.e. on the pressure side of the ventilator. In particular, the larger fine dust particles can be guided out of the ventilation unit by the design of the channels in such a way that they do not enter the purge gas inlet via the branching structure, but are discharged further via the sample gas outlet. This prevents the filter from being heavily loaded by larger particles, so that a longer service life of the filter can be achieved. The purge gas may be introduced from the purge device into the measurement space via one or more inlets. The sample gas outlet has at least one flow rate control device, which is, for example, an adjustable shut-off valve. The smaller the flow rate in the sample gas outlet, the higher the volume fraction of the test sample gas flow entering the clean air inlet. The flow rate of the purge gas can thus be controlled by the flow rate regulating device. The purge gas feed therefore acts as a bypass for the purge gas outlet. The flow rate control device of the sample gas output section is arranged in the flow direction of the test sample air behind the branching structure of the purge gas input section from the sample gas output section. The flow rate control device is arranged downstream of the branching structure of the ventilation device and the purge gas inlet in the flow direction of the test sample gas. The flow regulating device is therefore arranged in the pressure region of the ventilator of the ventilation device. This arrangement is advantageous because particles from the sample gas stream can accumulate on the flow regulating device (through which a throttle point is given). Larger agglomerates of particles may break off in operation and be carried along by the gas stream. Since the throttle point is arranged downstream of the branching structure of the purge gas feed in the flow direction, no particle agglomerates can enter the purge device, i.e. the filter, and damage or occupation of this filter renders it inoperative. The arrangement of the sample gas outlet behind the ventilation unit and behind the purging gas inlet from the sample gas outlet into the measurement space enables the sensor device with only one ventilation unit to be operated in a compact design.
In a development of the invention, the ventilation device is arranged behind the measuring space in the flow direction of the gas to be examined. By the arrangement of the ventilation unit behind the measurement space in the flow direction of the sample gas, the sample gas flow to be examined can be sucked in the form of a gas flow by the ventilation unit via the sample gas inlet into the measurement space and sucked out through this measurement space and further conducted to the sample gas outlet and the purge gas inlet. In particular, the arrangement of the ventilation unit between the measurement space and the sample gas outlet or the purge gas inlet makes it possible to operate the purge gas inlet without a further ventilation unit. A compact and cost-effective construction of the sensor device is thus provided.
In a further development of the invention, the purge gas feed has a gas-conducting connection to the sample gas discharge. The connection for the gas can be, for example, the connection of the lines of the sample gas outlet and the clean air inlet. The connection can be, for example, a T-piece, a branching structure or the like, so that the volume fraction of the sample gas flow guided, i.e. examined, in the sample gas outlet can be conducted to the clean air inlet.
In one refinement of the invention, the purge gas supply is configured as a line and the line has a connection to the sample gas outlet. The purge gas supply is configured as a line and has a line connection to the sample gas outlet. The connection can be, for example, a T-piece, a branching structure or the like, by means of which a flow portion of the air guided in the sample gas outlet can be guided into the clean air inlet.
In a further development of the invention, the purge gas feed has at least one filter device for purging the test gas. The purge gas inlet has at least one filter device, with which particles contained in the sample gas can be removed, in particular, so that the sample gas to be tested can be used as a purge gas for the measurement space after purging.
In a further development of the invention, the purge gas inlet is connected to the measuring space via a plurality of gas inlets and the gas inlets are arranged in the region of the optical element to be purged. The purge gas inlet is connected to the measurement space via a plurality of gas inlets for introducing a purge gas into the measurement space. The gas inlet can be, for example, a gas inlet opening through which a purging gas can be flowed into the measurement space. The gas inlet is arranged here such that the purging gas is guided along the optical element to be purged inside the measurement space. The gas inlet is in particular arranged such that the purge gas flow extends between the optical element and the sample gas flow. The purge gas flow thus forms a protective layer between the particle-laden sample gas flow and the optical element in order to prevent particles from depositing on the optical element.
In a development of the invention, the flow control device is formed by a shut-off valve. The flow regulating device of the sample gas outlet can be designed as an adjustable and controllable shut-off valve. The smaller the flow rate through the sample gas outlet, the higher the volume fraction is introduced through the purge air inlet which serves as a bypass. The gas flow rate, i.e. the volume of sample gas flowing through per unit time, can be set by the sample gas discharge. The shut-off valve can be arranged in the region of the outlet to the environment of the sample gas outlet.
Another aspect of the invention relates to a vehicle, in particular a motor vehicle, having a sensor device according to the invention.
Drawings
The invention will be further elucidated by means of an embodiment shown in the drawing. Shown in the attached drawings:
fig. 1 shows a schematic representation of a sensor device for checking a sample gas volume.
Detailed Description
Fig. 1 shows a sensor device 1 for checking at least one sample gas volume or sample gas flow, having a measurement space 2, a sample gas inlet 3, a sample gas outlet 4 and a purge gas inlet 5. The sensor device 1 has a measuring space 2 in which a sample gas volume, for example, an air volume from the vehicle environment, can be examined. For this purpose, optical elements 6, 7, such as, for example, a laser source and a corresponding laser receiver, such as, for example, a photodiode, are arranged in the measurement space 2. The sample gas to be examined is introduced into the measurement space 2 via the sample gas inlet 3. For this purpose, the sensor device 1 has a ventilation unit 8, through which sample gas can be sucked in. The sample gas outlet 4 leads out of the ventilation unit 8, through which the sample gas to be tested can be discharged again into the environment. The purified air input 5 is arranged to lead out from the sample gas output 4. The lines of the sample gas outlet 4 and of the purge gas inlet 5 can be connected to one another, for example, by a T-piece 9. The purge gas feed 5 has a purification device, in particular a filter device 10, through which the test sample gas can be filtered and thus cleaned of particles present in the test sample gas. The sample gas can be used as a purging gas for the measurement space 2 by purging in the filter device 10. For this purpose, the purge gas feed 5 is connected to the measuring space 2 via two gas inlets 11, 12. The gas inlets 11, 12 are arranged in the region of the optical elements 6, 7 in such a way that the purge gas is guided from the purge gas inlet 5 along the optical elements 6, 7. The purge gas flow is guided in particular along the optical elements 6, 7 in such a way that the purge gas flow is guided between the optical elements 6, 7 and the sample gas flow. The purge gas flow thus forms an enveloping air flow enveloping the sample gas flow, which acts like a protective layer and protects the optical elements 6, 7 from contamination by particles of the sample gas flow. The size of the volume fraction of the test sample gas which branches off from the sample gas outlet 4 into the purge gas inlet 5 can be adjusted by a flow rate control device 13 which is arranged in the region of the gas outlet 14 of the sample gas outlet. The smaller the flow rate of the sample gas through the gas outlet 14 is set, the higher the volume fraction of the sample gas branching off into the purge gas inlet 5 serving as a bypass. The intensity of the purge gas flow can thus be controlled by means of the flow regulating device 13.
All the features mentioned in the foregoing description and in the claims may be combined in any selection with the features of the independent claims. The disclosure of the invention is therefore not limited to the described or claimed combinations of features, but all combinations of features that are significant within the scope of the invention are to be regarded as being disclosed.
Claims (14)
1. Method for controlling a sensor device (1) for testing a sample gas volume, wherein the sample gas volume to be tested is introduced into a measurement space (2) in the form of a purge gas flow through a sample gas inlet (3), wherein the sample gas volume to be tested is tested in the measurement space (2), wherein the tested sample gas volume is conducted from the measurement space (2) through a ventilation unit (8) further into a sample gas outlet (4),
it is characterized in that the preparation method is characterized in that,
the volume fraction of the volume of the sample gas to be tested is branched off from the sample gas outlet (4) via a gas-conducting connection and fed to a purification device,
the volume fraction fed to the purification device is purified in the purification device, and
the cleaned volume fraction is fed as a cleaning gas into the measuring chamber (2).
2. Method according to claim 1, characterized in that the volume fraction fed to the purification device is adjustable in size by means of a flow rate control device (13) of the sample gas outlet (4).
3. Method according to any one of claims 1 or 2, characterized in that the purification device is a filtration device (10).
4. A method according to any one of claims 1 to 3, characterized in that the cleaned sample gas volume in the measurement space (2) is guided as a cleaning gas flow along optical elements (6, 7) arranged in the measurement space (2).
5. Method according to claim 4, characterized in that the cleaned sample gas volume in the measurement space (2) is guided as a cleaning gas flow between the sample gas to be examined and the optical element (6, 7).
6. The method according to any one of claims 1 to 5, wherein the purge gas stream has a higher flow velocity than the sample gas stream to be examined.
7. Sensor device for checking a sample gas volume, in particular for detecting the fine dust content of a sample gas volume, comprising: with at least one measuring space (2) for receiving a sample gas to be tested, with at least one sample gas inlet (3) associated with the measuring space (2) and with at least one sample gas outlet (4) associated with the measuring space (2),
characterized in that at least one purging gas inlet (5) is associated with the measuring space (2), a ventilation unit (8) is associated with the sample gas inlet (3), the sample gas outlet (4) and the purging gas inlet (5), and the sample gas outlet (4) has a flow rate control device (13).
8. Sensor device according to claim 7, characterized in that the ventilation unit (8) is arranged behind the measuring space (2) in the flow direction of the gas to be examined.
9. Sensor device according to one of claims 7 or 8, characterized in that the purge gas input (5) has a gas-conducting connection to the sample gas output (4).
10. Sensor device according to one of claims 7 to 9, characterized in that the purge gas feed (5) is partially configured as a line and the line has a connection to the sample gas outlet (4).
11. Sensor device according to one of claims 7 to 10, characterized in that the purge gas input (5) has at least one filter device (10) for purging the test sample gas.
12. Sensor device according to one of claims 7 to 11, characterized in that the purge gas input (5) is connected to the measurement space (2) by a plurality of gas inlets (11, 12) and that the gas inlets (11, 12) are arranged in the region of the optical element (6, 7) to be purged.
13. Sensor device according to any one of claims 7 to 12, characterized in that the flow regulating device (13) is constituted by a shut-off valve.
14. Vehicle having a sensor device according to any one of claims 7 to 13.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102019103884.7 | 2019-02-15 | ||
| DE102019103884 | 2019-02-15 | ||
| DE102019113533.8 | 2019-05-21 | ||
| DE102019113533 | 2019-05-21 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111579443A true CN111579443A (en) | 2020-08-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010092741.2A Pending CN111579443A (en) | 2019-02-15 | 2020-02-14 | Method for controlling a sensor device |
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|---|---|
| CN (1) | CN111579443A (en) |
| DE (1) | DE102020102120A1 (en) |
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