CN208206736U - A kind of laser dust sensor - Google Patents
A kind of laser dust sensor Download PDFInfo
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- CN208206736U CN208206736U CN201820657887.5U CN201820657887U CN208206736U CN 208206736 U CN208206736 U CN 208206736U CN 201820657887 U CN201820657887 U CN 201820657887U CN 208206736 U CN208206736 U CN 208206736U
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Abstract
The utility model discloses a kind of laser dust sensors comprising shell is arranged air inlet on the shell, the ventilating duct being connected to the air inlet is provided in shell；Air extractor, the air extractor are detachably located on the lateral surface of the shell, and the air extractor to outside the shell for being evacuated；Laser emitter, the laser emitter are installed module by independent laser emitter and are installed in shell, and the laser emitter is used to emit the air-flow that laser irradiation passes through the ventilating duct；Circuit board, the circuit board is set to the enclosure interior, photoelectric testing sensor, MCU are provided on the circuit board, the optical signal that particle of the received laser irradiation in the air-flow is scattered generation by the photoelectric testing sensor is converted into electric signal and sends MCU to, MCU is by handling the electric signal to obtain the size, number and concentration of the particle of the air-flow, the sensor of the utility model, since structure is simple, compact, laser emitter installation is stablized, and then the precision of dust detection is improved, reduce the output error of testing result.
Description
Technical field
The utility model belongs to dust detection field, and in particular to a kind of laser dust sensor.
Background technique
Laser dust sensor module is that the concentration of dust in air is detected using optical scattering principle, one built in sensor
A laser emitting diode and a photoelectric testing sensor, when work, first by laser emitting diode alignment detection zone transmitting
Laser pulse, laser can generate scattering light when encountering dust, and some scattered light returns to photoelectric testing sensor, Photoelectric Detection
Sensor converts optical signal into electric signal, then the scattering intensity of light in electric signal, arteries and veins are further analyzed by analyzing circuit
The information such as frequency, wavelength amplitude are rushed to reflect the concentration levels of dust in air.
Existing laser dust sensor detection accuracy is inadequate, and the consistency of output is poor.In addition existing laser dust passes
The work of sensor generic persistence causes its laser tube lifetime not grown, so that the service life of entire sensor is influenced, and in practical application
In and there are many scene be not need laser sensor to continue working.Furthermore the rotation speed of the fan of existing sensor is difficult to keep one
It causes, causes testing result inaccurate, testing result deviation range is very big.
Utility model content
To solve the above-mentioned problems, the purpose of this utility model is to provide a kind of detection accuracy height, detection consistency are good
Dust detection sensor.
To achieve the above object, the utility model is achieved by following technical scheme:
Laser dust sensor described in the utility model includes shell, and air inlet, setting in shell are arranged on the shell
There is the ventilating duct being connected to the air inlet；
Air extractor, the air extractor are detachably located on the lateral surface of the shell, the air extractor be used for
It is evacuated outside the shell；
Laser emitter, the laser emitter are installed module by independent laser emitter and are installed in shell, institute
State the air-flow that laser emitter passes through the ventilating duct for emitting laser irradiation；
Circuit board, the circuit board are set in the shell, portion, are provided with Photoelectric Detection sensing on the circuit board
Particle of the received laser irradiation in the air-flow is scattered the light of generation by device, MCU, the photoelectric testing sensor
Signal is converted into electric signal and sends MCU to, and MCU obtains the size, a of the particle of the air-flow by handling the electric signal
Several and concentration.
Further, the shell includes upper casing and lower casing, and cavity, the air inlet are formed between the upper casing and circuit board
Mouth is arranged on the upper casing, and the air inlet is connected to the cavity, and the ventilating duct is arranged on the lower casing, the gas
Stream enters the cavity from air inlet, then enters the ventilating duct via the venthole on the circuit board, passes through with ventilating duct
It is discharged outward after dust detection zone by the air extractor.
Further, the shell that dust detection zone is corresponded on laser emitter installation module and lower casing is all made of
Light-absorbing coating is arranged on surface in black material production, and is provided with setting in laser emitter installation module
There are multiple laser vias of light barrier, centerline collineation, the multiple laser via sets up separately in the light barrier two sides, described to swash
Dust detection zone described in optical transmitting set face.
Further, the groove with dust detection zone cooperation is additionally provided in the laser installation module, groove walls are set
There are opening, the open communication light trapping.
Further, the light sensing face of laser transmitter projects go out laser beam and the photoelectric testing sensor is flat
It goes, the light sensing face of photoelectric testing sensor described in the focus face of the laser beam.
Further, the upper casing is all made of conductive material production.
Further, institute's upper casing, lower casing, circuit board cooperatively form the installation cavity of the air extractor, and the pumping fills
The outlet end for being placed in the ventilating duct is installed, the air extractor to outside the shell for being evacuated.
Further, the air extractor is connect with the MCU.
Further, the laser emitter is connected with the MCU.
Further, it is installed between the laser emitter and the circuit board using plug-in type.
Further, it is solid that screw is all made of between the upper casing and the lower casing, between the circuit board and the lower casing
It is fixed.
Compared with prior art, the utility model has the beneficial effects that
1. the air extractor of the utility model is removably placed outside outside the shell, just dismounts, clean, and makes entire
The structure of sensor is more compact, and independent laser emitter installation module is arranged to install the laser emitter, can will swash
Optical transmitting set is more convenient, stablizes in set casing body, avoids the shaking of practical middle laser emitter, and then improves practical
Novel detection accuracy and stability and prevent laser emitter from damaging.
2. the utility model is used and is connected between MCU and fan and laser.It is controlled by MCU, on the one hand can make fan
Revolving speed is consistent, so that the flowing velocity for the air for keeping Detection of Air Quality intracavitary is constant, raising detection accuracy, detection
As a result on the other hand consistency is controlled, controllable rotation speed of the fan by MCU, adapts to different test scene requirements.In addition, logical
MCU control is crossed, it can be achieved that laser service intermittent, improves the service life of laser.
3. the utility model is provided with light barrier, non-parallel laser, and the multiple laser through holes of cooperation, limit can be absorbed
Detection accuracy can be improved in laser beam diverging processed.
4. the light sensing face of photoelectric testing sensor described in the focus face of the laser beam of the utility model, Ke Yibao
The stability of the light intensity of light sensing face induction is demonstrate,proved, and then improves precision, the stability of testing result.
5. the upper casing of the utility model is made of conductive material, anti-interference ability can be increased, testing result can be improved
Stability and precision.
Detailed description of the invention
Specific embodiment of the present utility model is described in further detail with reference to the accompanying drawing, in which:
Fig. 1 is the sensor overall structure diagram of the utility model；
Fig. 2 is the lower casing structural schematic diagram of the utility model；
Fig. 3 is the lower casing installation top view of the utility model；
Fig. 4 is the lower casing installation bottom view of the utility model.
Specific embodiment
It is illustrated below in conjunction with preferred embodiment of the attached drawing to the utility model, it should be understood that described herein excellent
It selects embodiment to be only used for describing and explaining the present invention, is not used to limit the utility model.
It include shell 1, Laser emission according to the preferred embodiment of the utility model laser sensor refering to fig. 1 shown in -4
Device installs module 2, circuit board 3, air extractor 4 and laser emitter 5, photoelectric testing sensor, MCU (Photoelectric Detection sensing
Device, MCU are not shown in the figure).Air inlet (not shown) is set on shell 1, and enclosure interior is set to the logical of air inlet connection
Air duct 14.Laser emitter is installed module 2 by the independent laser emitter with shell 1 and is arranged in shell 1, and laser emitter is used
Pass through the air-flow of airflow channel in transmitting laser irradiation.4 releasable connection of air extractor and the hull outside.Circuit board 3, it is described
Circuit board 3 is set to enclosure interior, is provided with photoelectric testing sensor, MCU on the circuit board, photoelectric testing sensor will
The optical signal received is converted into electric signal and sends MCU to, and MCU passes through intensity, pulse frequency, the wavelength amplitude etc. of the scattering light
Reflect the size, number, concentration levels of dust in air, and by external interface by dust size, number, concentration data
Output.
The laser sensor for dust detection of the preferred embodiment of the utility model, due to by the removable company of air extractor
Connect with the hull outside, therefore, the structure of sensor is easy to disassemble, cleaning, and structure is also more compact, further, since setting
Independent laser emitter installs module to install the laser emitter, laser emitter is more convenient, stable can fix
In shell, avoid the shaking of practical middle laser emitter, so improve the detection accuracy and stability of the utility model with
And prevent laser emitter from damaging.
Specifically, shell includes upper casing 11 and lower casing 12, forms cavity (in figure not between the upper casing 11 and circuit board 3
Show), the air inlet is arranged 11 on the upper casing, the air inlet and passes through cavity described in the venthole 31 on circuit board
Connection.
Specifically, the ventilating duct 14 is arranged on the lower casing 11, and the air-flow enters the cavity from air inlet, then
Enter the ventilating duct 14 via the venthole on the circuit board 3, with ventilating duct 14 by the dust detection zone on lower casing 12
It is discharged outward after 15 by air extractor 4.
Specifically, the shell of dust detection zone is corresponded to using suction on the laser emitter installation module 2 and lower casing 12
Light-absorbing coating is arranged on surface in luminescent material production, and is provided in laser emitter installation module
Light barrier 21, multiple laser vias 22 of centerline collineation, the multiple laser via 22 set up separately in 21 two sides of light barrier,
Dust detection zone 15 described in 5 face of laser emitter.Due to being provided with light barrier 21, the light of spilling can be absorbed；Light
Multiple laser vias 22 of 21 two sides of fence, can limit the diverging of laser beam, guarantee the depth of parallelism of laser beam.In addition, by
Housing parts (the i.e. laser light on shell 1 that dust detection zone is corresponded in module 2 and shell 1 is installed in the laser emitter
The housing parts that line passes through) be all made of light absorbent production or surface be arranged light-absorbing coating, can with efficient absorption veiling glare,
Improve detection accuracy.Wherein light absorbent can be black plastic, black carbon material, black fiber material or other black materials
And nano material.Certainly it is also not necessarily limited to only correspond to the housing parts of dust detection zone 15 on lower casing 12 using black material system
Make, is also possible to entire lower casing 12 and is all made of light absorbent.
Specifically, the groove 23 with the cooperation of dust detection zone is additionally provided in laser emitter installation module 2, groove walls are equipped with
Opening 24, open communication light trapping 25, the absorbable unscattered laser beam after test chamber of light trapping 25 avoid
Testing result deviation caused by secondary detection, to improve the precision of testing result.Light trapping is that laser emitter installs mould
The cavity opened up on block can open up wave groove on cavity wall, to improve absorptivity.Light trapping part can also use extinction material
Light-absorbing coating is arranged in material production or surface.
Specifically, the optical fiber sensitive surface of laser emitter 5 is launched laser beam and the photoelectric testing sensor is flat
It goes, the light sensing face of photoelectric testing sensor described in the focus face of the laser beam, it is ensured that light sensing face sense
The stability for the light intensity that should be arrived, and then improve precision, the stability of testing result.
Specifically, it is additionally provided with circuit board positioning protrusion 26 in laser emitter installation module 2, in order to laser emitter peace
Being coupled between die-filling piece 2 and circuit board 3.
Specifically, it is additionally provided with photoelectric testing sensor mounting hole 27 in laser emitter installation module 2, it is solid for installing
Determine photoelectric testing sensor.
Specifically, the upper casing 11 is made of conductive material, increases anti-interference ability, the steady of testing result can be improved
Qualitative and precision.
Specifically, the upper casing 11 as shown in Figure 1, lower casing 12, circuit board 3 cooperatively form the installation of the air extractor 4
Chamber, air extractor 4 are set to the outlet end of the ventilating duct 6, and the air extractor 4 to outside the shell for being evacuated.Pumping
The upper and lower side of device 4, left and right side are surrounded by housing wall, and front and rear sides connects with the internal cavities of shell 1 and the external world respectively
It is logical.Such structure setting makes air extractor be located at hull outside, just dismounts, cleans, and is also the structure of entire sensor
It is more compact.
Specifically, the air extractor 4 is controlled by MCU, and the speed of exhaust of air extractor 4 on the one hand can be made to keep one
Cause, thus make the flowing velocity of the air in dust detection zone 15 be it is constant, improve detection accuracy, on the other hand, pass through MCU
Control, the speed of exhaust of controllable air extractor 4 adapt to different test scene requirements.
Specifically, when air extractor is fan, and the fan is connect with the MCU.It is controlled by MCU, a side
Face can be such that rotation speed of the fan is consistent, so that the flowing velocity of the air in dust detection zone be made to be constant, raising detection essence
On the other hand degree is controlled, controllable rotation speed of the fan by MCU, adapts to different test scene requirements.
Specifically, the laser emitter 5 is connected with the MCU.It is controlled by MCU, it can be achieved that the intermittent work of laser
Make, improves the service life of laser.
Specifically, it is installed between the laser emitter 5 and the circuit board 3 using plug-in type, is convenient for 5 He of laser emitter
Installation cooperation between circuit board 3.Circuit board positioning protrusion 26 can be set by installing in laser emitter in module 2, come auxiliary
Help the inserting between laser emitter 5 and the circuit board 2.
Specifically, between the upper casing 11 and lower casing 12, circuit board 3 and lower casing 12 use screw connection, and connection can be made steady
It is fixed, it is also convenient for dismounting.
Specifically, it is also set up on the circuit board 3 and passes coffret 7 with data, tied detection by data transmission interface 7
Fruit passes to user or intelligent terminal.
The above descriptions are merely preferred embodiments of the present invention, not makees in any form to the utility model
Limitation, therefore it is all without departing from the content of the technical scheme of the utility model, implement according to the technical essence of the utility model to above
Any modification, equivalent variations and modification, are still within the scope of the technical solutions of the present invention made by example.
Claims (10)
1. a kind of laser dust sensor characterized by comprising
Shell is arranged air inlet on the shell, the ventilating duct being connected to the air inlet is provided in shell；
Air extractor, the air extractor are detachably located on the lateral surface of the shell, and the air extractor is used for described
It is evacuated outside shell；
Laser emitter, the laser emitter is installed module by independent laser emitter and is installed in shell, described to swash
Optical transmitting set is used to emit the air-flow that laser irradiation passes through the ventilating duct；
Circuit board, the circuit board are set to the enclosure interior, on the circuit board be provided with photoelectric testing sensor,
MCU, the light that particle of the received laser irradiation in the air-flow is scattered generation by the photoelectric testing sensor are believed
It number is converted into electric signal and sends MCU to, MCU is by handling the electric signal to obtain size, the number of the particle of the air-flow
And concentration.
2. laser dust sensor according to claim 1, it is characterised in that: the shell includes upper casing and lower casing, institute
It states and forms cavity between upper casing and the circuit board, the air inlet is arranged on the upper casing, the air inlet and the sky
Chamber connection, the air-flow enters the cavity from air inlet, then enters the ventilating duct via the venthole on the circuit board,
It is discharged outward after the dust detection zone on lower casing by the air extractor with ventilating duct.
3. laser dust sensor according to claim 2, it is characterised in that: the laser emitter installs module, and
The shell that dust detection zone is corresponded on lower casing is all made of light absorbent production or light-absorbing coating is arranged on surface, and described
Multiple laser vias of light barrier, centerline collineation are provided in laser emitter installation module, it is the multiple to swash
Light through-hole sets up separately in the light barrier two sides, dust detection zone described in the laser emitter face.
4. laser dust sensor according to claim 2, it is characterised in that: be additionally provided in laser installation module and institute
The groove of dust detection zone cooperation is stated, groove walls are equipped with opening, the open communication light trapping.
5. laser dust sensor described in any one of -4 according to claim 1, it is characterised in that: the laser transmitter projects
Laser beam out is parallel with the light sensing face of the photoelectric testing sensor, light described in the focus face of the laser beam
The light sensing face of electro-detection sensor.
6. laser dust sensor according to claim 2, it is characterised in that: the upper casing is made of conductive material.
7. laser dust sensor according to claim 1, it is characterised in that: the air extractor is connect with the MCU.
8. laser dust sensor according to claim 1, it is characterised in that: the laser emitter and the MCU phase
Even.
9. laser dust sensor according to claim 1, it is characterised in that: the laser emitter and the circuit board
Between using plug-in type install.
10. laser dust sensor according to claim 2, it is characterised in that: between the upper casing and the lower casing, institute
It states and is all made of screw between circuit board and the lower casing and fixes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820657887.5U CN208206736U (en) | 2018-05-04 | 2018-05-04 | A kind of laser dust sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820657887.5U CN208206736U (en) | 2018-05-04 | 2018-05-04 | A kind of laser dust sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208206736U true CN208206736U (en) | 2018-12-07 |
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ID=64522180
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820657887.5U Active CN208206736U (en) | 2018-05-04 | 2018-05-04 | A kind of laser dust sensor |
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| CN (1) | CN208206736U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109975188A (en) * | 2019-04-27 | 2019-07-05 | 新立科技股份有限公司 | A kind of two-way PM2.5 detection device |
| CN113418840A (en) * | 2021-06-22 | 2021-09-21 | 西石(厦门)科技股份有限公司 | Gas detection device and vehicle-mounted tail gas detection system |
-
2018
- 2018-05-04 CN CN201820657887.5U patent/CN208206736U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109975188A (en) * | 2019-04-27 | 2019-07-05 | 新立科技股份有限公司 | A kind of two-way PM2.5 detection device |
| CN113418840A (en) * | 2021-06-22 | 2021-09-21 | 西石(厦门)科技股份有限公司 | Gas detection device and vehicle-mounted tail gas detection system |
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