CN108562524A - Laser light scattering particle analyte detection device - Google Patents
Laser light scattering particle analyte detection device Download PDFInfo
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- CN108562524A CN108562524A CN201810609275.3A CN201810609275A CN108562524A CN 108562524 A CN108562524 A CN 108562524A CN 201810609275 A CN201810609275 A CN 201810609275A CN 108562524 A CN108562524 A CN 108562524A
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- 238000001514 detection method Methods 0.000 title claims abstract description 107
- 239000002245 particle Substances 0.000 title claims abstract description 31
- 239000012491 analyte Substances 0.000 title claims abstract description 24
- 238000002356 laser light scattering Methods 0.000 title claims abstract description 17
- 239000013618 particulate matter Substances 0.000 claims abstract description 57
- 238000005259 measurement Methods 0.000 claims abstract description 46
- 230000008033 biological extinction Effects 0.000 claims abstract description 16
- 238000012545 processing Methods 0.000 claims description 16
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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
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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
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Abstract
This application discloses a kind of laser light scattering particle analyte detection devices, the detection device includes shell, fan, two laser emission elements, photodetector unit, extinction unit and control unit, fan is set in the air duct of shell, two laser emission elements and photodetector unit are set in the measurement cavity of shell, the transmitting light path of two laser emission elements is crossed to form predetermined angle, light path intersection point is located within the scope of the signal detection of photodetector unit, and extinction unit is set to the other side for measuring cavity；Control unit is configured as obtaining the second particulate matter detected value according to continuous multiple detected multiple first particulate matter detected values of period 1 difference, wherein, described control unit obtains corresponding first particulate matter detected value within each period 1 according to the output of the photodetector unit.The detection device of the application can reduce the interference of impurity etc., improve the measurement accuracy of detection device, increase the service life of detection device.
Description
Technical field
The present invention relates to sensor fields, and in particular to a kind of laser light scattering particle analyte detection device.
Background technology
With the rapid development of industry, haze weather is more and more, finely ground particles (such as PM2.5, PM10 in air
Deng) health of content and the mankind is closely related.In order to assess air quality, it is necessary to finely ground particles content is monitored,
To instruct air resolution.The method of mainstream is gravimetric method in the prior art.But gravimetric method has many trouble places, it is first
First, labor workload is big, and the degree of automation is low, is not suitable for remote monitoring, and while taking annual average need continuous sampling 12 hours with
On, it can not reflect PM2.5 concentration short time situations of change, in addition, when filter membrane adsorbs PM2.5, it inevitably can be the dust of bigger
It is adsorbed onto on filter membrane, influences monitoring result, cause error, in addition current air monitering website is unevenly distributed, for air environment
Quality-monitoring is range-restricted big.Occur the available small-sized PM2.5 detection devices of family as a result, can measure in real time
The data of PM2.5.
Fig. 1-2 is the structural schematic diagram of existing laser particle analyte detection device, and current this detection device has tended to
Maturation, and it is widely used in civilian detection field.As shown in Figs. 1-2, detection device includes fan 1, fan drive circuit 11, swashs
Light emitting unit 2, laser drive circuit 21, photodetector unit 3, signal processing circuit 31 and control unit 4.When 1 turn of fan
When dynamic, cause to measure the air-flow variation inside cavity 10 so that the air with particulate matter, which enters, measures cavity 10, opens at this time
Laser emission element 2 is irradiated, and particulate matter meeting scattering light detects and be converted into electric signal by photodetector unit 11,
After amplifying via signal processing circuit 31, it is sent to control unit 4 and carries out electrical signal detection, the concentration numbers of final output particulate matter
Value.It is mounted with photodetector unit 3 (photoelectric converter), laser emission element 2 and fan as shown in Fig. 2, measuring in cavity 10
1.Pass through the rotation of fan 1 so that measure and form larger negative pressure in cavity 10, be pumped into air, laser emission element 2 vertically shines
Inject into air, as in Fig. 2 arrow direction be Laser emission direction.Wherein, it is provided in Laser emission terminal reflective
Structure 5 avoids the useless light that the shell structure of detection device reflects from being received by photodetector unit 3, to influence to measure knot
Fruit.
There are following disadvantages for existing laser light scattering particle analyte detection device：
1) particulate matter measured in cavity blocks mutually on Laser emission direction, can not be irradiated with a laser, lead completely
Cause error of measured data larger；
2) air is directly entered measurement cavity, and measure is blocked without any, and the impurity in air can seriously affect measurement knot
The service life of fruit and detection device；
3) other regions of laser irradiation, will produce the light scattering of some strength, after being received by photodetector unit, generate
More interference signal；
4) it is measured in cavity when the moisture in air enters, also can be considered as particulate matter, influence measurement result, while shadow
Ring the service life of detection device；
5) usage time of detection device reaches after a certain period of time, and measurement chamber cylinder accumulation dust is more, and zero is caused to be floated
It moves, itself error increases, and eventually leads to data inaccuracy.
Invention content
In view of this, the application provides a kind of laser light scattering particle analyte detection device, it is possible to reduce interference improves detection dress
The measurement accuracy set increases the service life of detection device.
This application provides a kind of laser light scattering particle analyte detection devices, including：
Shell, the shell are provided with air inlet and outlet, air duct and measure cavity；
Fan is set in the air duct；
Two laser emission elements are set to the side for measuring cavity, the transmitting of two laser emission elements
Light path is crossed to form predetermined angle；
Photodetector unit is set in the measurement cavity, the friendship of the transmitting light path of two laser emission elements
Point is within the scope of the signal detection of the photodetector unit；
Extinction unit is set to the other side for measuring cavity, opposite with two laser emission elements；
Control unit is configured as distinguishing detected multiple first particle analyte detections according to continuous multiple period 1
Value obtains the second particulate matter detected value, wherein described control unit is within each period 1 according to the photodetector unit
Output obtain corresponding first particulate matter detected value.
Preferably, each period 1 includes that the first subcycle and the second subcycle, described control unit are configured
It to control the fan work in the first subcycle, while controlling the photodetector unit and being detected, in second round
The interior control fan is stopped.
Preferably, described control unit, which is configured as controlling the fan after continuous multiple period 1, stops
It only worked for the first predetermined time.
Preferably, the detection device further includes：
Filter element is set to the air inlet；
Air-inlet grille is opened when being configured as following the fan work.
Preferably, described control unit was additionally configured at interval of second round, and triggering carries out zero point correction.
Preferably, described control unit, which is configured as controlling the fan, was stopped after the second predetermined time, kept wind
Fan is stopped and controls the laser emission element and photodetector unit work to obtain corresponding third particle analyte detection
Value carries out zero point correction based on the third particulate matter detected value.
Preferably, the detection device further includes：
Timing unit, the run time for recording the detection device；
Wherein, described control unit is configured as when the time that the timing unit records reaching the third predetermined time,
It sends and replaces signal.
Preferably, the detection device further includes：
Humidity sensor is set in the measurement cavity, for detecting humidity in the measurement cavity；
Wherein, described control unit is configured as, when the humidity is more than humidity threshold, controlling the fan and stopping work
Make and sends humidity alarm signal.
Preferably, the laser emission element is connect by laser drive circuit with described control unit；
The fan is connect by fan drive circuit with described control unit；
The photodetector unit is communicated to connect by signal processing circuit and described control unit；
Wherein, the signal processing circuit includes：
First amplifier is connect with the photodetector unit；
First filtering channel, including PM2.5 filters and the second amplifier, are connected to first amplifier and the control
Between unit processed；
Second filtering channel, including PM10 filters and third amplifier, are connected to first amplifier and the control
Between unit processed.
Preferably, first amplifier is low-noise amplifier.
This application discloses a kind of laser light scattering particle analyte detection device, the detection device include shell, fan, two
Laser emission element, photodetector unit, extinction unit and control unit, fan are set in the air duct of shell, and two are swashed
Light emitting unit and photodetector unit are set in the measurement cavity of shell, the transmitting light path intersection of two laser emission elements
Predetermined angle is formed, light path intersection point is located within the scope of the signal detection of photodetector unit, and extinction unit is set to measurement cavity
The other side；Control unit is configured as distinguishing detected multiple first particle analyte detections according to continuous multiple period 1
Value obtains the second particulate matter detected value, wherein described control unit is within each period 1 according to the photodetector unit
Output obtain corresponding first particulate matter detected value.The detection device of the application can reduce the interference of impurity etc., improve inspection
The measurement accuracy for surveying device, increases the service life of detection device.
Description of the drawings
By referring to the drawings to the description of the embodiment of the present invention, the above and other purposes of the present invention, feature and
Advantage will be apparent from, in the accompanying drawings：
Fig. 1 is the structure diagram of the laser particle analyte detection device of the prior art；
Fig. 2 is the structural schematic diagram of the laser particle analyte detection device of the prior art；
Fig. 3 is the structural schematic diagram of the laser particle analyte detection device of the embodiment of the present invention；
Fig. 4 is the structure diagram of the laser particle analyte detection device of the embodiment of the present invention；
Fig. 5 is structural schematic diagram of the air-inlet grille of the embodiment of the present invention when opening and closing；
Fig. 6 is the structural schematic diagram of the signal processing circuit of the embodiment of the present invention.
Specific implementation mode
Below based on embodiment, present invention is described, but the present invention is not restricted to these embodiments.Under
Text to the present invention datail description in, it is detailed to describe some specific detail sections.Do not have for a person skilled in the art
The description of these detail sections can also understand the present invention completely.In order to avoid obscuring the essence of the present invention, well known method, mistake
There is no narrations in detail for journey, flow, element and circuit.
In addition, it should be understood by one skilled in the art that provided herein attached drawing be provided to explanation purpose, and
What attached drawing was not necessarily drawn to scale.
Unless the context clearly requires otherwise, "include", "comprise" otherwise throughout the specification and claims etc. are similar
Word should be construed as the meaning for including rather than exclusive or exhaustive meaning；That is, being containing for " including but not limited to "
Justice.
In the description of the present invention, it is to be understood that, term " first ", " second " etc. are used for description purposes only, without
It can be interpreted as indicating or implying relative importance.In addition, in the description of the present invention, unless otherwise indicated, the meaning of " multiple "
It is two or more.
Unless otherwise clearly defined and limited, the terms such as term " installation ", " connected ", " connection ", " fixation " should be done extensively
Reason and good sense solution may be a detachable connection for example, it may be being fixedly connected, or integral；Can be mechanical connection, it can also
It is electrical connection；Can be directly connected, can also indirectly connected through an intermediary, can be connection inside two elements or
The interaction relationship of two elements, unless otherwise restricted clearly.For the ordinary skill in the art, Ke Yigen
Understand the concrete meaning of above-mentioned term in the present invention according to concrete condition.
A small-sized measurement cavity is arranged generally in package casing, measures the one of cavity for small-sized PM2.5 detection devices
End is set as air intake, and a small-sized fan is arranged in other end, other regional seals measure in cavity and are provided with laser
Transmitter unit and photodetector unit.When fan rotates, after the air containing PM2.5 enters measurement cavity, sent out by laser
After penetrating the laser irradiation of unit transmitting, light scattering phenomenon is generated, scattering light is converted to electric signal by photodetector unit, then
It exports and is detected to control unit, calibrated further according to the Laboratory Calibration of science, you can measurement obtains PM2.5 in present air
Content.PM2.5 (fine particle) refers to the particulate matter that aerodynamics equivalent diameter in surrounding air is less than or equal to 2.5 microns.
It can be suspended in the air the long period, and content concn is higher in air, and it is more serious just to represent air pollution.The present invention is real
It applies example and is based on above-mentioned laser light scattering principle, existing laser light scattering particle analyte detection device is improved.It is specific as follows：
Fig. 3-Fig. 4 is the structural schematic diagram of the laser light scattering particle analyte detection device of the embodiment of the present invention.Such as Fig. 3-Fig. 4 institutes
Show, the detection device includes shell 100, fan 200, laser emission element 300 and 400, photodetector unit 500, extinction
Unit 600 and control unit 700.The shell 100 is provided with air inlet 110, air outlet 120 and measures cavity 130, described
Air inlet 110, air outlet 120 and measurement cavity 130 can form the air duct of detection particulate matter.Air enters from air inlet 110
It measures in cavity 130, then goes out again from air outlet.Fan 200 is set in air duct, it is preferable that is set to air outlet 120
Place, can accelerate air to flow.It when fan 200 rotates, measures and forms larger negative pressure in cavity 130, be pumped into air, air
Enter from air inlet 110 and measures in cavity 130, the flow direction arrow direction as shown in Figure 3 of the air.The fan
200 could alternatively be air pump, can make air quickly and stably by measuring cavity 130.
Filter element 111 is provided at air inlet 110, for filtering air in larger impurity particle object.Due to these
The volume of impurity is larger, when entering in measurement cavity 130, will block laser, seriously affects the measurement essence of detection device
Degree, or even the measurement data of moment can be made exceeded.Meanwhile these impurity measure it is also possible to being adhered in cavity 130, to inspection
The service life for surveying device has an impact.Therefore measurement accuracy, same time delay can be improved by filter element 111 being arranged at air inlet 110
The service life of long detection device.In the present embodiment, the filter element 111 could be provided as filter screen, the filter screen
Aperture be more than 10 microns, it might even be possible to reach a millimeter rank.Since the aperture of filter screen is larger, PM10 and PM10 or less are big
Small particulate matter can be entered by strainer measures cavity 130, will not generate any blocking to the measurement of PM10 and PM2.5.Together
When, during measurement, the particle being adhered on filter screen can voluntarily be fallen during fan 200 is stopped, therefore will not shadow
Ring the measurement accuracy of late detection device.Meanwhile filter screen is safeguarded and replacing without frequent, save cost.
Preferably, it is additionally provided with air-inlet grille 112 at the air inlet 110 of shell 100.The air-inlet grille 112 can be with
Setting is in 111 inner or outer side of filter element.The air-inlet grille 112 is one-way air inlet grid.When fan 200 operates, survey
It measures and generates negative pressure in cavity 130,112 stress of air-inlet grille is inwardly opened, and air is pumped into from air inlet 110.Air-inlet grille 112
Opening direction it is identical as air-flow direction, as shown in Figure 5.When fan 200 shuts down, air-inlet grille 112 is closed, can
Enter to avoid external any gas (including any particulate matter in gas) and measure in cavity 130, ensure that measurement cavity
Cleaning inside 130 increases the service life of detection device.It, can be to avoid measurement cavity meanwhile when detection device detects again
The particulate matters such as the dust accumulated in 130 impact measurement accuracy.
Laser emission element 300 and 400 is set to the side for measuring cavity 130, and two laser emission elements 300,400 are sent out
The light path penetrated is measuring intersection in cavity 130, forms predetermined angle α.Using two laser emission elements intersecting beams to
Grain object is irradiated, and can be stopped light to avoid the particulate matter being relatively large in diameter on a certain Laser emission direction, be needed to miss
The particulate matter to be detected improves the measurement accuracy of particulate matter.Laser intensity can also be improved simultaneously, particulate matter is made to pass through measurement
The scattered signal enhancing measured when cavity 130, increases the accuracy of measurement.When the angle of two transmitting light paths is too big, it can cause
The volume of detection device becomes larger；It is too small to be easy to cause light path interference.Therefore, in the present embodiment, two emit the predetermined of light path
The ranging from 50-60 degree of angle α.No matter predetermined angle α is much, as long as disclosure satisfy that the point that two transmitting light paths are intersected, with
The signal detection range of photodetector unit 500 corresponds to.
Photodetector unit 500 is set to the bottom for measuring cavity 130.The signal detection of the photodetector unit 500
Direction is vertical with air-flow direction (i.e. air stream transportation direction), the direction of Laser emission respectively.Wherein, two emit light path
Intersection point is located within the scope of the signal detection of the photodetector unit 500, so that particulate matter is dissipated by what laser irradiation generated
Electric signal can be converted to by the detection of photodetector unit 500 by penetrating light, be then transferred to control unit 700 and subsequently located
Reason.The photodetector unit 500 can be photoelectric converter, and principle is after light scatters, and light in particular directions dissipates
Ejected wave shape is related with particle diameter, and the reality of different-grain diameter can be obtained by the waveform separation statistics and reduction formula of different-grain diameter
When particulate matter number concentration.Photodetector unit 500 is converted to corresponding electric signal according to light scattering waveform, is then transferred to
Control unit 700 carries out subsequent processing.
Extinction unit 600 is set to the other side for measuring cavity 130, opposite with described two laser emission elements.
Preferably, the extinction unit 600 is set to the laser emission element 300 and 400 opposite sides along Laser emission direction
It measures on cavity 130, can be received by photodetector unit 500 to avoid the useless light that cavity 130 reflects is measured, to influence
Measurement result.Meanwhile extinction unit 600 is additionally operable to absorb and resumes defeated laser beam by photodetector unit 500 is subsequent and swash
The edge light beam that light emitting unit 300,400 emits.The extinction unit 600 could be provided as extinction cloth or extinction paint, institute
It states extinction cloth and hardly reflects any light, the interference that can be brought to avoid this body structure of detection device.
Control unit 700 is communicated to connect by fan drive circuit 210 and fan 200, for control the work of fan 200 and
It is stopped, while can be additionally used in the rotation speed change for monitoring fan 200.Control unit 700 passes through laser drive circuit respectively
310, laser drive circuit 410 is communicated to connect with laser emission element 300, laser emission element 400, for controlling Laser emission
Unit 300 and laser emission element 400 emit laser.Control unit 700 passes through signal processing circuit 510 and photodetector unit
500 communication connections are detected, as shown in Figure 4 for controlling the unlatching of photodetector unit 500.Wherein, signal processing circuit
The current signal of acquisition is converted to voltage signal by 510, and control will be sent to after signal amplification filtering by amplifier and filter
Unit 700 processed carries out subsequent processing.Wherein, the fan drive circuit 210, laser drive circuit 310, laser drive circuit
410, signal processing circuit 510 and control unit 700 are located at independently of on the circuit board except the shell.
In the present embodiment, the signal processing circuit 510 includes the first amplifier 511, the first filtering channel 512, the
Two filtering channels 513, as shown in Figure 6.First amplifier 511 is connect with the signal output port of photodetector unit 500, is used for
Amplify electric signal.In the present embodiment, the first amplifier 511 is low-noise amplifier, and amplification factor is not high, but is introduced dry
It disturbs considerably less, original electric signal will not be damaged.
First filtering channel 512 includes PM2.5 filters 5121 and the second amplifier 5122, is connected to first amplification
Between device 511 and described control unit 700.By 511 amplified electric signal of the first amplifier, PM2.5 filters are transferred to,
Voltage signal of the PM2.5 filters by being equal to and less than PM2.5 directly exports, and other electric signals are directly filtered, it
It is transferred to control unit 700 after amplifying afterwards using the second amplifier 5122, completes the detection of PM2.5.
Second filtering channel 513 includes PM10 filters 5131 and third amplifier 5132, is connected to first amplification
Between device 511 and control unit 700.By 511 amplified electric signal of the first amplifier, it is transferred to PM10 filters, PM10
Voltage signal of the filter by being equal to and less than PM10 directly exports, and other electric signals are directly filtered, and passes through again later
It crosses after third amplifier 5132 amplifies and is transferred to control unit 700, complete the detection of PM10.Since PM10 filters can equally allow
PM2.5 passes through, therefore can also equally detect the content of PM2.5, with pass through after the first filtering channel 512 detection obtain
PM2.5 contents are compared, more accurately.Thus the electric signal detected is not readily susceptible to interfere, and measurement accuracy is higher.
In the present embodiment, the detection mode of laser light scattering particle analyte detection device is compartment.Wherein, control unit
700 detect one the first particulate matter detected value of acquisition within each period 1 according to the output of photodetector unit 500, then
The second particulate matter detected value is obtained according to continuous multiple detected multiple first particulate matter detected values of period 1 difference.Tool
Body, each period 1 includes the first subcycle and the second subcycle, and described control unit 700 is in the first subcycle
200 work extraction air of fan is controlled, while controlling laser emission element 300 and 400 and emitting laser, controls photodetector unit
500 be detected obtain a first particulate matter detected value, in the second subcycle control fan 200 be stopped, then after
Continue next period 1, obtain next first particulate matter detected value, until continuously obtaining multiple first particulate matter detected values
And according to multiple first particulate matter detected values calculate obtain a second particulate matter detected value after, control fan 200 be stopped
The detection for continuing next second particulate matter detected value after first predetermined time obtains.The second particulate matter detected value is
The concentration of the particulate in air currently measured, for characterizing current air quality.
Specific example is as follows, when opening the extraction air of fan 200, laser emission element 300,400 and Photoelectric Detection list
Member 500 carries out primary particulate measurement, and electric signal is sent to control unit 700 by photodetector unit 500, obtains one first
Particulate matter detected value is then shut off fan 200, after being spaced 1 second (interval time can also be voluntarily arranged according to demand), then
Secondary opening fan 200 measures once, obtains a first particulate matter detected value, and so cycle obtains multiple first particle analyte detections
The multiple first particulate matter detected value is calculated according to algorithm and obtains a second particulate matter detected value by value, control unit 700,
And it is sent to display terminal, with for reference.The second particulate matter detected value is for characterizing the environmental quality currently measured.
In the present embodiment, multiple first particulate matter detected values are at least 6, that is, are carried out continuously 6 times and measure one the second particle of acquisition
Quality testing measured value.The control method can improve the measurement accuracy of detection device.Control unit 700 is obtaining second particulate matter
After detected value, control fan 200 was stopped after the first predetermined time, detected acquisition second again again according to aforesaid way
Grain quality testing measured value, obtains always the second particulate matter detected value repeated as above later.First predetermined time can be according to demand
Voluntarily be arranged, in the present embodiment the first predetermined time be set as 5 seconds.
The laser light scattering particle analyte detection device of the present embodiment also has the function of automatic zero point correcting, can be to avoid due to surveying
It measures and accumulates dust in cavity 130, cause detection device zero no longer accurate, and influence measurement result.In the present embodiment, it controls
Unit 700 controls at interval of second round and carries out zero point correction.In the present embodiment, the second round is 90 days, that is, is detected
Device often runs 90 days and carries out a zero point correction.The process of the zero point correction is：It is stopped in fan 200 second predetermined
After time, fan 200 is kept to continue to be stopped and control laser emission element 300,400 and the work of photodetector unit 500
Detection obtains corresponding third particulate matter detected value, configures the third particulate matter detected value to the zero parameter of sensor,
Realize zero point correction.For example, fan stop 30 seconds or so when, measure cavity 130 in particulate matter all can due to gravity,
It is deposited in the bottom for measuring cavity 130 completely, simultaneously because the one-way air inlet grid 112 that air inlet 110 is arranged, can stop outer
Any gas (including any particulate matter in gas) in portion, which enters, to be measured in cavity 130, thinks that Laser emission direction does not have at this time
There is particulate matter either there is only the particulate matter being attached on light-sensitive device or cavity, fan 200 continues to be stopped at this time
And open laser emission element 300,400 and photodetector unit 500 and detect the data i.e. third particulate matter detected value got,
The zero parameter of detection device is may be considered, updates the zero data in control unit 700, the zero school of detection device again
Standard is completed.The zero point correction function can ensure the precision that detection device measures and the stability of measurement.Meanwhile Yong Huye
Can be more according to routine use situation, such as haze weather, when dust is more, it can voluntarily carry out zero point correction.Described
Two predetermined times can be voluntarily arranged according to demand.Third particulate matter value described here may be 0, it may be possible to which positive value also may be used
Can be negative value, it is mainly related with the environment of detection device current detection.
The laser light scattering particle analyte detection device of the present embodiment further includes timing unit 800, is configured as recording the inspection
Survey the run time of device.It when detection device brings into operation, clocks, can be also always maintained at after this time power-off, as long as
Energization will continue to add up.Since fan 200, photodetector unit 500 etc. have the service life of its own, when described
When the time that timing unit 800 records reaches the third predetermined time, control unit 700 sends more substitution detector or its parts
Signal, remind the service life of user detection device to reach the upper limit, need replacing.The third predetermined time can be according to practical feelings
Condition sets itself, general recommendations are 5 years.User can also inquire the usage time of current detection device by order, minimum single
Position is minute.When the timing of detection device reaches 5 years, the primary message for replacing prompt can be sent out week about, until user
Until removing the alarm, or power-off.
Since when common air humidifier is opened in family, aqueous vapor will enter laser light scattering particle object with air
In the measurement cavity 130 of detection device, there is mistake in the concentration data for being irradiated with a laser reflective, to detect at this time particulate matter.Cause
This, the detection device is additionally provided with humidity sensor 900, is set in the measurement cavity 130, and cavity is measured for detecting
Humidity in 130.
The humidity sensor 900 is communicated to connect by humistor signal processing circuit 910 and control unit 700.Institute
It can be humistor to state humidity sensor 900.When aqueous vapor is into fashionable, the resistance of humidity sensor 900 changes, and humidity passes
Resistance signal is sent to control unit 700 by sensor 900 by humistor signal processing circuit 910.Control unit 700 passes through
The variation of resistance can calculate the humidity variation for obtaining and measuring in cavity 130.When humidity is more than humidity threshold, control unit
700 control wind by fan drive circuit 210, laser drive circuit 310, laser drive circuit 410, signal processing circuit 510
Fan 200, laser emission element 300,400, photodetector unit 500 it is out of service, while sending humidity alarm signal, remind and use
Family current humidity is excessively high, please exclude to measure again after environmental problem.In the process, humidity sensor 900 can detect always
Humidity, until humidity restores normal, control unit 700 can just control detection device and be again turned on measurement function, improve detection
The confidence level of device and the stability of measurement.Meanwhile moisture damage internal electronic device is avoided, influence detection device uses the longevity
Life.In the present embodiment, the humidity threshold could be provided as 80%.
The embodiment of the present invention provides a kind of laser light scattering particle analyte detection device, the detection device include shell, fan,
Two laser emission elements, photodetector unit, extinction unit and control unit, fan are set in the air duct of shell, and two
A laser emission element and photodetector unit are set in the measurement cavity of shell, the transmitting light path of two laser emission elements
It is crossed to form predetermined angle, light path intersection point is located within the scope of the signal detection of photodetector unit, and extinction unit is set to measurement
The other side of cavity；Control unit is configured as distinguishing detected multiple first particulate matters according to continuous multiple period 1
Detected value obtains the second particulate matter detected value, wherein described control unit is within each period 1 according to the Photoelectric Detection
The output of unit obtains corresponding first particulate matter detected value.The detection device of the application can reduce the interference of impurity etc., carry
The measurement accuracy of height detection device increases the service life of detection device.
The foregoing is merely the preferred embodiment of the present invention, are not intended to restrict the invention, for those skilled in the art
For, the present invention can have various modifications and changes.It is all within spirit and principles of the present invention made by any modification, equivalent
Replace, improve etc., it should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of laser light scattering particle analyte detection device, including：
Shell, the shell are provided with air inlet and outlet, air duct and measure cavity；
Fan is set in the air duct；
Two laser emission elements are set to the side for measuring cavity, the transmitting light path of two laser emission elements
It is crossed to form predetermined angle；
Photodetector unit is set in the measurement cavity, the intersection point position of the transmitting light path of two laser emission elements
In within the scope of the signal detection of the photodetector unit；
Extinction unit is set to the other side for measuring cavity, opposite with two laser emission elements；
Control unit is configured as according to continuously multiple period 1, detected multiple first particulate matter detected values obtained respectively
Take the second particulate matter detected value, wherein described control unit is within each period 1 according to the defeated of the photodetector unit
Go out to obtain corresponding first particulate matter detected value.
2. detection device according to claim 1, which is characterized in that each period 1 include the first subcycle and
Second subcycle, described control unit is configured as controlling the fan work in the first subcycle, while controlling the light
Electro-detection unit is detected, and the fan is controlled within second round and is stopped.
3. detection device according to claim 1, which is characterized in that described control unit is configured as described continuous more
The fan is controlled after a period 1 to be stopped for the first predetermined time.
4. detection device according to claim 1, which is characterized in that the detection device further includes：
Filter element is set to the air inlet；
Air-inlet grille is opened when being configured as following the fan work.
5. detection device according to claim 1, which is characterized in that described control unit is additionally configured at interval of second
Period, triggering carry out zero point correction.
6. detection device according to claim 1, which is characterized in that described control unit is configured as controlling the fan
It is stopped after the second predetermined time, fan is kept to be stopped and control the laser emission element and photodetector unit work
Make to obtain corresponding third particulate matter detected value, zero point correction is carried out based on the third particulate matter detected value.
7. detection device according to claim 1, which is characterized in that the detection device further includes：
Timing unit, the run time for recording the detection device；
Wherein, described control unit is configured as when the time that the timing unit records reaching the third predetermined time, is sent
Replace signal.
8. detection device according to claim 1, which is characterized in that the detection device further includes：
Humidity sensor is set in the measurement cavity, for detecting humidity in the measurement cavity；
Wherein, described control unit is configured as, when the humidity is more than humidity threshold, controlling the fan and being stopped simultaneously
Send humidity alarm signal.
9. detection device according to claim 1, which is characterized in that the laser emission element passes through laser drive circuit
It is connect with described control unit；
The fan is connect by fan drive circuit with described control unit；
The photodetector unit is communicated to connect by signal processing circuit and described control unit；
Wherein, the signal processing circuit includes：
First amplifier is connect with the photodetector unit；
First filtering channel, including PM2.5 filters and the second amplifier, are connected to first amplifier and the control is single
Between member；
Second filtering channel, including PM10 filters and third amplifier, are connected to first amplifier and the control is single
Between member.
10. detection device according to claim 9, which is characterized in that first amplifier is low-noise amplifier.
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| CN201810609275.3A CN108562524A (en) | 2018-06-13 | 2018-06-13 | Laser light scattering particle analyte detection device |
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Address after: 100088 Room 221, Building 5, 11 Deshengmenwai Street, Xicheng District, Beijing Applicant after: Borui Shangge Technology Co., Ltd Address before: 100088 Beijing, Xicheng District Desheng street, room 11, building No. 221, room 5 Applicant before: BEIJING PERSAGY ENERGY SAVING TECHNOLOGY Co.,Ltd. |
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Application publication date: 20180921 |