CN216747284U - Novel laser PM sensor - Google Patents
Novel laser PM sensor Download PDFInfo
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- CN216747284U CN216747284U CN202123207184.3U CN202123207184U CN216747284U CN 216747284 U CN216747284 U CN 216747284U CN 202123207184 U CN202123207184 U CN 202123207184U CN 216747284 U CN216747284 U CN 216747284U
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Abstract
The utility model discloses a novel laser PM sensor, including sensor probe and the circuit box of being connected through wire and sensor probe, sensor probe includes the shell, has optical channel in the shell, and optical channel includes the air chamber, and air chamber and outside UNICOM still contain laser transceiver module, reflection component, connecting piece and photoelectric head, photoelectric head passes through the connecting piece with sensor probe shell connects, optical channel is located reflection component with between the laser transceiver module, laser transceiver module includes laser instrument, detector, first, second optic fibre light pipe, laser instrument, detector integrated install in photoelectric head, including laser instrument drive circuit and detection circuit in the circuit box. The utility model provides a laser PM sensor takes the receiving and dispatching integrated reflective structure of sharing, utilizes optic fibre light pipe as receiving and dispatching optical transmission, realizes high accuracy, low cost, simple to operate, high stability, difficult pollution, longe-lived etc..
Description
Technical Field
The utility model relates to a sensor technical field especially relates to a novel laser PM sensor.
Background
The current vehicle exhaust PM sensor mainly adopts the particulate matter leakage current formula, particulate matter electrostatic deposition formula and laser scattering absorption formula etc. two kinds have the measurement accuracy poor, problem such as measurement cycle length, and laser scattering absorption formula begins to be widely used at home because of reasons such as can continuous measurement, measurement accuracy height and with low costs.
At present, a laser scattering absorption type vehicle exhaust PM sensor mainly adopts a double-end transmission type, two optical fiber bundles are used for transmitting and receiving optical transmission, the installation is complex, the installation cost is high, the optical fiber bundles are high in cost and cannot be bent, and the vibration of the optical fiber bundles affects the measured value.
SUMMERY OF THE UTILITY MODEL
In view of present vehicle exhaust PM sensor installation complicacy, it is with high costs, measurement accuracy low grade problem, the utility model provides a novel laser PM sensor takes receiving and dispatching to hold integrated reflective structure altogether to utilize optic fibre light pipe as receiving and dispatching optical transmission, can realize effects such as high accuracy, low cost, simple to operate, high stability.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a novel laser PM sensor comprises a sensor probe and a circuit box connected with the sensor probe through a wire, wherein the sensor probe comprises a shell, an optical channel is arranged in the shell and comprises an air chamber, the air chamber is communicated with the outside, the sensor probe also comprises a laser transceiving component, a reflecting component, a connecting piece and a photoelectric head, the photoelectric head is connected with the shell of the sensor probe through the connecting piece, the reflecting component is arranged in the shell of the sensor probe, the optical channel is positioned between the reflecting component and the laser transceiving component, the laser transceiving component comprises a laser, a detector, a first optical fiber light pipe and a second optical fiber light pipe, the laser and the detector are integrally installed in the photoelectric head, and the circuit box comprises a laser driving circuit and a detection circuit, the circuit box is connected with the laser and the detector through a wire, laser emitted by the laser is coupled to enter the first optical fiber light pipe, laser emitted by the first optical fiber light pipe passes through the optical channel and the air chamber and then is emitted to the reflection assembly, the laser emitted to the reflection assembly is reflected by the reflection assembly and then passes through the optical channel and the air chamber and then is coupled to enter the second optical fiber light pipe, and the second optical fiber light pipe irradiates laser output entering the second optical fiber light pipe to the detector and is detected by the detector.
According to an aspect of the present invention, the optical fiber light pipe is connected to the optical channel through the connecting member, and the connecting member is an insulating member.
According to the utility model discloses an aspect, the photoelectric head still includes circuit board, visor, the circuit board is provided with the leading-out terminal of temperature measurement circuit, amplifier circuit, laser instrument and detector respectively, drive circuit, detection circuit on the circuit box pass through the wire with the leading-out terminal is connected, is used for connecting laser instrument and detector, visor fixed connection in on the photoelectric head.
According to the utility model discloses an aspect, laser instrument and detector installation position are equipped with temperature measurement resistance, temperature measurement resistance with temperature measurement circuit connection, be equipped with the treater in the circuit box, the treater is according to temperature measurement resistance's change control the light-emitting power of laser instrument.
According to the utility model discloses an aspect, the photoelectric head outside is provided with the heat dissipation part, the heat dissipation part is the multi-disc heat dissipation wing.
According to an aspect of the invention, the sensor further comprises a reflection assembly mounting cover, the reflection assembly mounting cover being in threaded connection with the probe.
According to an aspect of the utility model, the reflection component material is for returning the reflecting material that the light characteristic is good and have contrary reflective characteristic.
According to an aspect of the utility model, the air chamber is the oblong channel, the detector is the photodiode detector.
According to the utility model discloses an aspect, the inside gas circuit that is equipped with that runs through of sensor, the gas circuit includes the air inlet, sweeps gaseous splitter box, sweeps the mouth on, sweeps the mouth down, it sweeps the mouth and is located down to go up to sweep the mouth air chamber both ends.
According to the utility model discloses an aspect, there is little air pump in the circuit box, little air pump includes inlet port and venthole, the filter screen is installed to little air pump inlet port, the venthole through rubber hose draw forth the back with the air inlet of gas circuit is connected, sweep the gas splitter box and will sweep gas and introduce respectively sweep the mouth with sweep down the mouth.
The utility model discloses the advantage of implementing: by adopting a single-hole installation mode of a receiving-transmitting common-end integrated reflection type structure and not adopting a common installation mode of a transmitting-receiving transmission type double-end structure, the installation is more convenient, and the installation cost is saved. The reflection assembly in the reflection type structure adopts a reflection material with better light return characteristic, is insensitive to installation angle error, reduces the requirement on light path calibration and debugging, and ensures the high consistency and repeatability of laser reflection signals. The optical fiber light pipe is used for transmitting and receiving optical transmission, the sensor is insensitive to vehicle vibration, and the measurement result is more stable. The circuit box is connected with the sensor probe through a wire, and laser emission and laser reception are integrated at one end of the probe, so that the installation is more flexible and the cost is reduced. The micro-air pump is adopted to continuously blow and sweep the two ends of the measuring air chamber, so that the accumulation of carbon smoke particles in a field to be measured on an optical component is avoided, and the long service life of the sensor is ensured. The laser receiving and transmitting assembly adopts a heat insulation and strong heat dissipation design, so that the problem that a laser and a detector in the laser receiving and transmitting assembly cannot work normally due to overhigh temperature is effectively avoided, the measurement result is corrected through temperature measurement of a thermistor and the like, and the accuracy of the measurement result is ensured.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic diagram of an internal cross-sectional structure of a novel laser PM sensor according to the present invention.
1. The optical fiber probe comprises a probe body, 2, a gas chamber, 3, an optical channel, 4, a laser, 5, a detector, 6, an optical fiber light guide pipe, 7, a light guide pipe installation structure fixing screw, 8, a connecting piece, 9, a reflection assembly installation cover, 10, a gas inlet, 11, a lower purging port, 12, an upper purging port, 13, a transmitting laser, 14, a returning laser, 15, a photoelectric head circuit board, 16, a photoelectric head protective cover, 17, a photoelectric head protective cover fixing screw, 18, a photoelectric head fixing flange, 19, a photoelectric head fixing flange thread, 20, a photoelectric head heat dissipation fin, 21, a welding flange seat, 22, a probe installation flange, 23, a probe installation flange thread and 24 reflection assemblies.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
As shown in fig. 1, a novel laser PM sensor comprises a sensor probe 1, a circuit box connected with the sensor probe 1 through a wire, a laser transceiver module, a reflection module 24, a connector 8 and a photoelectric head; the sensor probe 1 comprises a shell, an optical channel 3 is arranged in the shell, the optical channel 3 comprises an air chamber 2, the air chamber 2 is communicated with the outside, the photoelectric head is connected with the shell of the sensor probe 1 through the connecting piece 8, the reflecting component 24 is arranged in the shell of the sensor probe 1, and the optical channel 3 is positioned between the reflecting component 24 and the laser transceiving component; the laser receiving and transmitting assembly comprises a laser 4, a detector 5, a first optical fiber light pipe and a second optical fiber light pipe, the laser 4 and the detector 5 are integrally installed in the photoelectric head, a laser driving circuit and a detection circuit are arranged in the circuit box, and the circuit box is connected with the laser 4 and the detector 5 through wires. In order to facilitate transmission, distribution of electrical energy or transmission of electrical signals, the circuit box may be connected to the laser 4 and the detector 5 by long cables.
The utility model discloses in, novel laser PM sensor during operation, the laser coupling of 4 launches of laser instrument gets into first optic fibre light pipe, warp the laser process that first optic fibre light pipe jetted out optical channel 3 reaches penetrate to behind the air chamber 2 reflection assembly 24, penetrate to reflection assembly 24's laser process behind the reflection assembly 24 reflection process optical channel 3 reaches the coupling gets into second optic fibre light pipe behind the air chamber 2, second optic fibre light pipe will get into second optic fibre light pipe laser output shines on detector 5, quilt detector 5 surveys.
When gas passes through the gas cell 2 of the novel PM sensor, PM particles and molecules generate light scattering under the irradiation of light, and at the same time, absorb part of the energy of the irradiated light. When a beam of parallel monochromatic light, namely the emitting laser 13, is incident to the measured particle field, the signal of the returning laser 14 is attenuated under the influence of scattering and absorption around the particles, and the relative attenuation rate can basically linearly reflect the relative concentration of dust in the measured field. The intensity of the light intensity is in direct proportion to the intensity of the electric signal after photoelectric conversion, and the relative attenuation rate can be obtained by measuring the electric signal. In this way, the relative attenuation rate of the emitted laser 13 passing through the concentration field to be measured can be obtained, and the concentration of the exhaust PM particles can be inverted according to the attenuation signal.
By adopting a laser reflection type detection mode, a reflection type structure integrating receiving and transmitting ends together is adopted, and a common transmission type double-end structure with one transmitting end and one receiving end is not adopted, so that the installation is more convenient, and the installation cost is saved. Meanwhile, the optical fiber light pipe 6 is used for transmitting and receiving optical transmission, so that the effects of high precision, low cost, convenience in installation, high stability and the like can be achieved. After the optical fiber light guide pipe 6 is adopted, the sensor is insensitive to vehicle vibration, and the measurement result can be ensured to be more stable.
In this embodiment, the optical fiber light pipe 6 passes through the connecting piece 8 with the optical channel 3 is connected, in order to make the sensor probe 1 be adapted to the higher place of temperature, the connecting piece 8 is the insulating thermal insulation part, guarantees through the length of the insulating thermal insulation part of simulation analysis that the operating temperature of laser 4 and detector 5 installation site is suitable among the laser transceiver module, has effectively avoided the problem that laser 4 and detector 5 among the laser transceiver module can not normally work because of the high temperature. The insulating and heat insulating component is in threaded connection with a photoelectric head fixing flange thread 19 on the probe shell through a photoelectric head fixing flange 18. The insulating and heat insulating component is a light pipe installation structure, and the optical fiber light pipe 6 is arranged in the light pipe installation structure through a light pipe installation structure fixing screw 7.
The photoelectric head further comprises a photoelectric head circuit board 15 and a protective cover 16, wherein the protective cover 16 is connected with the photoelectric head through a photoelectric head protective cover fixing screw 17 and fixedly connected to the photoelectric head. The photoelectric head circuit board 15 is respectively provided with a temperature measuring circuit, an amplifying circuit, a laser 4 and a leading-out terminal of the detector 5, and a driving circuit and a detecting circuit on the circuit box are connected with the leading-out terminal through leads and used for connecting the laser 4 and the detector 5. The circuit box can be connected with the laser and the detector through long cables for facilitating transmission, distribution of electric energy or transmission of electric signals. The laser 4 can also be provided with a laser shell outside, and the laser shell is provided with a heat radiation structure. The laser 4 and the detector 5 are provided with temperature measuring resistors at installation positions, the temperature measuring resistors are connected with the temperature measuring circuit, a processor is arranged in the circuit box, and the processor controls the light emitting power of the laser 4 according to the change of the temperature measuring resistors and power monitoring signals in the laser 4. The photoelectric head is externally provided with a heat dissipation part which is a plurality of heat dissipation fins 20, so that the heat dissipation area can be increased, and the problem that the laser 4 and the detector 5 in the laser transceiving component cannot work normally due to overhigh temperature is effectively avoided.
Temperature measuring resistors are designed at the installation parts of the laser 4 and the detector 5, the light emitting power of the laser 4 is corrected by the circuit box processor according to the temperature of the temperature and a power monitoring signal in the laser 4 according to the power calibration data of the laser 4, so that the influence of temperature change on the light emitting power is inhibited, and the accuracy of a measuring result is ensured.
In this embodiment, a reflection assembly 24 is installed at the tail end of the novel PM sensor probe 1, and the reflection assembly 24 is a reflective material with good light return characteristics and retroreflection characteristics. When the emergent laser of the transmitting optical fiber light guide pipe passes through the air chamber 2 and then irradiates to the reflecting material, the reflecting material has better structural stability, and the returning light returns through the air chamber 2 and then is received by the receiving optical fiber light guide pipe. In order to further increase the service life of the reflection assembly 24 and the stability of the test result, the reflection assembly 24 is provided with a reflection assembly mounting cover 9 at the upper part, and the reflection assembly mounting cover 9 is in threaded connection with the probe 1. The reflective member 24 may be a mirror made of a reflective material having retroreflective properties with good retroreflective properties.
The reflection assembly 24 is made of a reflection material with good light return characteristics, is insensitive to installation angle errors, reduces the requirement on light path calibration and debugging, and ensures the high consistency and repeatability of laser reflection signals.
In practical application, the air chamber 2 is an oblong channel, and can be designed into other shapes, such as a circular channel. In this embodiment, the detector 5 is a photodiode detector.
In this embodiment, a gas path is arranged inside the sensor probe 1 in a penetrating manner, the gas path includes a gas inlet 10, a purging gas flow-dividing groove, an upper purging port and a lower purging port, and the upper purging port and the lower purging port are located at two ends of the gas chamber 2. The circuit box is internally provided with a micro air pump, the micro air pump comprises an air inlet and an air outlet, a filter screen is installed on the air inlet of the micro air pump, dust is prevented from blowing in a sensor probe, the air outlet is connected with the air inlet 10 of the air path after being led out through a rubber hose, and the blowing gas distributing chute introduces blowing gas into the upper blowing port and the lower blowing port respectively.
When the sensor works, the gas circuit in the sensor probe 1 respectively introduces inlet gas to the two ends of the lower blowing port 11 and the upper blowing port 12 of the gas chamber, and continuously blows, so that gas particles of a concentration field to be measured do not enter the optical channel 3 to pollute the reflective material and the edge of the optical fiber conduit 6. In order to further ensure the purging effect, the gas discharge direction entering the gas chamber 2 is consistent with the gas outlet direction of the purging port.
Through adopting little air pump to sweep in succession measuring 2 both ends of air chamber, avoided in the concentration field that awaits measuring the accumulation of PM particulate matter in the gas on optical component, difficult pollution has guaranteed novel PM sensor's long-life uses. Meanwhile, the stability of the measuring result is improved.
In this embodiment, the novel laser PM sensor may further be provided with a mounting seat. The mounting seat is a welding flange seat 21. During the installation of the sensor, the sensor probe 1 can be installed through the probe installation flange 22, and the fixing nut is matched with the probe installation flange thread 23 in a screwed mode and fixed on the probe installation flange 22, so that the installation stability is improved.
In practical application, the novel laser PM sensor adopts a single-end installation mode. The device can be installed in an automobile tail gas pipe and can also be installed in other equipment and used for monitoring the PM concentration change of a concentration field to be detected.
When the mounting method is applied to the automobile tail gas pipe, the specific mounting steps are as follows: firstly, drilling a round hole with a specified specification on a tail gas pipe, welding a sensor welding flange seat 21 on the tail gas round hole, and then fixing a sensor probe 1 on a mounting seat through a fixing nut to complete tail gas installation of the novel laser PM detector.
The utility model discloses a laser PM sensor, the simple installation saves installation cost, convenient to use, and the range of application is extensive.
The utility model discloses the advantage of implementing: by adopting a single-hole installation mode of a transmitting-receiving common-end integrated reflection type structure and not adopting a common installation mode of a transmitting-receiving one-transmitting double-end structure, the installation is more convenient, and the installation cost is saved. The reflection assembly in the reflection type structure adopts a reflection material with better light return characteristic, is insensitive to installation angle error, reduces the requirement on light path calibration and debugging, and ensures the high consistency and repeatability of laser reflection signals. The optical fiber light pipe is used for transmitting and receiving optical transmission, the sensor is insensitive to vehicle vibration, and the measurement result is more stable. The circuit box is connected with the sensor probe through a wire, and laser emission and laser reception are integrated at one end of the probe, so that the installation is more flexible and the cost is reduced. The micro-air pump is adopted to continuously blow and sweep the two ends of the measuring air chamber, so that the accumulation of carbon smoke particles in a field to be measured on an optical component is avoided, and the long service life of the sensor is ensured. The laser receiving and transmitting assembly adopts a heat insulation and strong heat dissipation design, so that the problem that a laser and a detector in the laser receiving and transmitting assembly cannot work normally due to overhigh temperature is effectively avoided, the measurement result is corrected through temperature measurement of a thermistor and the like, and the accuracy of the measurement result is ensured.
The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are all covered by the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A novel laser PM sensor comprises a sensor probe and a circuit box connected with the sensor probe through a wire, wherein the sensor probe comprises a shell, an optical channel is arranged in the shell, the optical channel comprises an air chamber, the air chamber is communicated with the outside, the sensor probe is characterized by also comprising a laser transceiving component, a reflecting component, a connecting piece and a photoelectric head, the photoelectric head is connected with the shell of the sensor probe through the connecting piece, the reflecting component is arranged in the shell of the sensor probe, the optical channel is positioned between the reflecting component and the laser transceiving component, the laser transceiving component comprises a laser, a detector, a first optical fiber light pipe and a second optical fiber light pipe, the laser and the detector are integrally installed in the photoelectric head, and the circuit box comprises a laser driving circuit and a detection circuit, the circuit box is connected with the laser and the detector through a wire, laser emitted by the laser is coupled to enter the first optical fiber light pipe, laser emitted by the first optical fiber light pipe passes through the optical channel and the air chamber and then is emitted to the reflection assembly, the laser emitted to the reflection assembly is reflected by the reflection assembly and then passes through the optical channel and the air chamber and then is coupled to enter the second optical fiber light pipe, and the second optical fiber light pipe irradiates laser output entering the second optical fiber light pipe to the detector and is detected by the detector.
2. The novel laser PM sensor of claim 1, wherein said fiber optic light pipe is connected to said optical channel via said connector, said connector being an insulating and heat insulating member.
3. The novel laser PM sensor according to claim 1, wherein said optical pickup further comprises a circuit board and a protective cover, said circuit board is respectively provided with leading-out terminals of a temperature measuring circuit, an amplifying circuit, a laser and a detector, said driving circuit and said detecting circuit on said circuit box are connected with said leading-out terminals through wires for connecting said laser and said detector, said protective cover is fixedly connected to said optical pickup.
4. The novel laser PM sensor according to claim 3, wherein a temperature measuring resistor is arranged at the laser and detector mounting position, the temperature measuring resistor is connected with the temperature measuring circuit, a processor is arranged in the circuit box, and the processor controls the light output power of the laser according to the change of the temperature measuring resistor.
5. The novel laser PM sensor according to claim 1, wherein a heat dissipation component is arranged outside the photoelectric head, and the heat dissipation component is a plurality of heat dissipation fins.
6. The novel laser PM sensor of claim 1 further including a reflective assembly mounting cap, said reflective assembly mounting cap being threadably connected to said probe.
7. The novel laser PM sensor of claim 1, wherein said reflective element is made of a reflective material with good retroreflective properties.
8. The novel laser PM sensor of claim 1, wherein said gas cell is an oblong channel and said detector is a photodiode detector.
9. The novel laser PM sensor according to any one of claims 1-8, wherein a gas path is provided through the sensor, the gas path includes a gas inlet, a purge gas splitter, an upper purge port, and a lower purge port, and the upper purge port and the lower purge port are located at two ends of the gas chamber.
10. The novel laser PM sensor of claim 9, wherein a micro air pump is arranged in the circuit box, the micro air pump comprises an air inlet hole and an air outlet hole, a filter screen is installed on the air inlet hole of the micro air pump, the air outlet hole is connected with the air inlet of the air path after being led out through a rubber hose, and the purging gas diversion channel leads purging gas into the upper purging port and the lower purging port respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123207184.3U CN216747284U (en) | 2021-12-17 | 2021-12-17 | Novel laser PM sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123207184.3U CN216747284U (en) | 2021-12-17 | 2021-12-17 | Novel laser PM sensor |
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| CN216747284U true CN216747284U (en) | 2022-06-14 |
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| CN202123207184.3U Active CN216747284U (en) | 2021-12-17 | 2021-12-17 | Novel laser PM sensor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114235655A (en) * | 2021-12-17 | 2022-03-25 | 数量级(上海)信息技术有限公司 | Novel laser PM sensor and method for monitoring PM in field to be measured |
| CN115753777A (en) * | 2022-11-30 | 2023-03-07 | 青岛崂应海纳光电环保集团有限公司 | In-situ gas detection device |
-
2021
- 2021-12-17 CN CN202123207184.3U patent/CN216747284U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114235655A (en) * | 2021-12-17 | 2022-03-25 | 数量级(上海)信息技术有限公司 | Novel laser PM sensor and method for monitoring PM in field to be measured |
| CN115753777A (en) * | 2022-11-30 | 2023-03-07 | 青岛崂应海纳光电环保集团有限公司 | In-situ gas detection device |
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