CN205826470U - A kind of PM2.5 sensor - Google Patents
A kind of PM2.5 sensor Download PDFInfo
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- CN205826470U CN205826470U CN201620719139.6U CN201620719139U CN205826470U CN 205826470 U CN205826470 U CN 205826470U CN 201620719139 U CN201620719139 U CN 201620719139U CN 205826470 U CN205826470 U CN 205826470U
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Abstract
The utility model discloses a kind of PM2.5 sensor, by pure air, the testing result of sensor is calibrated automatically, overcome owing to particulate matter accumulates the error caused, it is ensured that in the testing result using cycle inner sensor, there is higher accuracy.Its technical scheme is: PM2.5 sensor includes detected gas passage, calibration gas passage, detection light source cell, light receiving unit, signal processing unit, electromagnetic valve, control unit of electromagnetic valve and sensing chamber.Sensing chamber's inlet channel is divided into detected gas passage and calibration gas passage, the pure air after being respectively adopted outside air and filtering, obtain detectable concentration and the background concn of PM2.5 such that it is able to utilize background concn that detectable concentration is calibrated.
Description
Technical field
This utility model relates to PM2.5 particle concentration detection field in air, particularly relates to based on light scattering method
The sensor of PM2.5 detection.
Background technology
PM2.5 refers to the aerodynamic equivalent diameter particulate matter less than or equal to 2.5 microns in surrounding air, and its particle diameter is little,
Area is big, and activity is strong, the most incidentally poisonous and harmful substances (such as heavy metal, microorganism etc.), and time of staying length in an atmosphere,
Fed distance is remote, thus the impact on health and atmosphere quality is the biggest.In February, 2012, Environment Protect in China portion
Issue " ambient air quality " (GB3095-2012), be wherein additionally arranged the concentration limit of PM2.5.Therefore, in air
PM2.5 concentration is accurately measured significant.
At present, in detection air, the sensor of suspended particulate substance quality concentration is mainly based upon light scattering principle.According to light
Scattering principle, the particulate matter in air, under the light beam of some strength irradiates, can send scattered light to surrounding space.Photodetection
Device collection of scattered light pulse signal is also translated into voltage pulse signal, and the size of pulse signal corresponds to the particle diameter of granule,
The number of pulse is corresponding to the number of granule.After sample gas flow and sampling time are fixing, just can measure a certain particular volume
The concentration of corresponding particle in long-pending.
PM2.5 sensor based on light scattering principle, simple in construction low cost, it is simple to measure in real time, it is adaptable to vehicle-mounted sky
Gas cleaning system, detects PM2.5 concentration inside and outside car.But after using for a long time, particulate matter can be at sensor internal
Accumulation, even sticks on light source, light path and photodetector so that error occurs in the collection of scattered light signal, causes biography
The measurement result of sensor is inaccurate.
Utility model content
The brief overview of one or more aspect given below is to provide the basic comprehension in terms of these.This general introduction is not
The extensive overview of all aspects contemplated, and the key or decisive key element being both not intended to identify all aspects is the most non-
Attempt to define the scope in terms of any or all.Its unique purpose is intended to provide the one of one or more aspect in simplified form
A little concepts think the sequence of more detailed description given later.
The purpose of this utility model is to solve the problems referred to above, it is provided that a kind of PM2.5 sensor, by pure air pair
The testing result of sensor is calibrated automatically, overcomes owing to particulate matter accumulates the error caused, it is ensured that within the use cycle
The testing result of sensor has higher accuracy.
The technical solution of the utility model is: this utility model discloses a kind of PM2.5 sensor, leads to including detected gas
Road, calibration gas passage, detection light source cell, light receiving unit, signal processing unit, electromagnetic valve, control unit of electromagnetic valve and
Sensing chamber, wherein said control unit of electromagnetic valve controls described electromagnetic valve and leads to described calibration gas at described detected gas passage
Switching between road, air is filtered by described calibration gas passage, produces clean gas and is passed through described sensing chamber, described detection
Light source cell sends light beam, and described light receiving unit is acquired to the scattered light produced and is converted into potential pulse letter
Number, described signal processing unit is calculated the background concn value of PM2.5, described detection according to the voltage pulse signal received
Extraneous air is directly passed through sensing chamber without filtration by gas passage, is calculated the detectable concentration value of PM2.5, at described signal
Reason unit utilizes the background concn value of described PM2.5 to calibrate the detectable concentration value of described PM2.5, and after exporting calibration
PM2.5 concentration value.
According to an embodiment of PM2.5 sensor of the present utility model, described electromagnetic valve has one and is connected with air inlet
Air entry and two gas outlets being connected with described detected gas passage and described calibration gas passage respectively.
According to an embodiment of PM2.5 sensor of the present utility model, described control unit of electromagnetic valve includes timing sub-list
Unit and electromagnetic valve switch subelement, wherein said timing subelement set one determine the time, through described determine the time after send out
Going out switching signal, described electromagnetic valve switch subelement controls the break-make of described electromagnetic valve according to described switching signal, is used for switching
Described detected gas passage and described calibration gas passage.
According to an embodiment of PM2.5 sensor of the present utility model, described calibration gas passage is provided with filter, described
Fine particle in filters trap air, filters to produce clean gas to air.
According to an embodiment of PM2.5 sensor of the present utility model, described detection light source cell includes laser diode
And shaping lens, described laser diode sends laser beam, and described shaping lens projects after described laser beam shaping
In sensing chamber.
According to an embodiment of PM2.5 sensor of the present utility model, described light receiving unit include photodiode and
Plus lens, described plus lens collects the scattered light in sensing chamber and converged to described photodiode, described photoelectricity
Diode receives optical signal and converts thereof into voltage pulse signal and send to described signal processing unit.
According to an embodiment of PM2.5 sensor of the present utility model, it is single that described signal processing unit includes that signal amplifies
Unit, concentration computing unit, data storage cell and concentration calibration unit, described voltage pulse signal amplifies single through described signal
After unit amplifies, transmission obtains corresponding PM2.5 to described concentration computing unit, described concentration computing unit according to signal of telecommunication calculating
Concentration signal, described data storage cell is in order to store background concn value and the detectable concentration of described PM2.5 of described PM2.5
Value, described concentration calibration unit carries out school according to the background concn value of the PM2.5 stored to the detectable concentration value of described PM2.5
Accurate.
According to an embodiment of PM2.5 sensor of the present utility model, described sensor also includes sensor housing, described
Being provided with air inlet and fan on sensor housing, open described fan, air enters described sensor also from described air inlet
Discharge via described fan.
According to an embodiment of PM2.5 sensor of the present utility model, described detection light source cell and described light-receiving list
Unit is respectively positioned in described sensing chamber, and the two ends of described sensing chamber connect inlet channel and exhaust passage, described exhaust passage respectively
It is connected with described fan.
This utility model contrast prior art has a following beneficial effect: the design of PM2.5 sensor of the present utility model
Rationally, simple in construction, application simplicity.PM2.5 sensor include detected gas passage, calibration gas passage, detection light source cell,
Light receiving unit, signal processing unit, electromagnetic valve, control unit of electromagnetic valve and sensing chamber.Sensing chamber's inlet channel is divided into inspection
Surveying gas passage and calibration gas passage, the pure air after being respectively adopted outside air and filtering, the detection obtaining PM2.5 is dense
Degree and background concn such that it is able to utilize background concn to calibrate detectable concentration, effectively eliminate particulate matter and accumulate biography
The impact of sensor output result, improves the pure air after the accuracy of detection of PM2.5 concentration, and filtration and protects as one
Gas, has certain cleaning action, extends the service life of sensor sensor.
Accompanying drawing explanation
Fig. 1 shows the structural representation of the preferred embodiment of PM2.5 sensor of the present utility model.
Fig. 2 shows the flow process of the preferred embodiment of PM2.5 concentration automatic calibrating method based on the realization of PM2.5 sensor
Figure.
Fig. 3 shows the schematic diagram of the preferred embodiment of control unit of electromagnetic valve.
Fig. 4 shows the schematic diagram of the preferred embodiment of signal processing unit.
Detailed description of the invention
After reading the detailed description that embodiment of the disclosure in conjunction with the following drawings, it is possible to be more fully understood that this practicality is new
The features described above of type and advantage.In the accompanying drawings, each assembly is not necessarily drawn to scale, and have similar correlation properties or
The assembly of feature is likely to be of same or like reference.
Refer to the structure that Fig. 1, Fig. 1 show the preferred embodiment of PM2.5 sensor of the present utility model.PM2.5 passes
Sensor includes detected gas passage 4, calibration gas passage 5, detection light source cell 7, light receiving unit 9, signal processing unit, electricity
Magnet valve 3, electronic valve control unit, sensing chamber 8.Control unit of electromagnetic valve controls electromagnetic valve 3 at detected gas passage 4 and calibration gas
Switch between body passage 5.Air is filtered by calibration gas passage 5, produces clean gas and is passed through sensing chamber 8.Detection light source
Unit 7 sends light beam, and the scattered light produced is acquired and is converted into voltage pulse signal by light receiving unit 9.Signal
Processing unit is calculated the background concn value of PM2.5 according to the voltage pulse signal received.Detected gas passage 4 directly will
Extraneous air is passed through sensing chamber 8 without filtration, is calculated the detectable concentration value of PM2.5.Signal processing unit utilizes PM2.5's
The detectable concentration value of PM2.5 is calibrated by background concn value, and exports the PM2.5 concentration value after calibration.
Additionally, sensor also includes the sensor housing 1 of rectangle, air inlet 2 is positioned at the left end of sensor housing 1, fan
11 sides being positioned at sensor housing 1, open fan 11, and air just enters sensor from air inlet 2 and discharges via fan 11.
Electromagnetic valve 3, detected gas passage 4, calibration gas passage 5, sensing chamber 8, exhaust passage it is provided with in sensor housing 1
10.Electromagnetic valve 3 have an air entry being connected with air inlet 2 and two respectively with detected gas passage 4 and calibration gas
The gas outlet that passage 5 is connected, electromagnetic valve 3 can be connected with detected gas passage 5 or air inlet 2 and calibration gas at air inlet 2
Passage 5 switches between being connected.Specifically, as it is shown on figure 3, include timing subelement 31 and electricity at control unit of electromagnetic valve
Magnet valve switch subelement 32, timing subelement 31 sets one and determines the time, sends switching signal after this determines the time,
Electromagnetic valve switch subelement 32 controls the break-make of electromagnetic valve 3 according to switching signal, for change detection gas passage 4 and calibration gas
Body passage 5.
Be provided with filter 6 in calibration gas passage 5, the fine particle in air can be caught, air is filtered with
Produce clean gas.
Detection light source cell 7, light receiving unit 9, sensing chamber 8 side and detected gas passage 4 phase it is provided with in sensing chamber 8
Even, opposite side is connected with exhaust passage 10, and exhaust passage 10 connects fan 11.
Detection light source cell 7 includes laser diode and shaping lens.Laser diode sends laser beam, and shaping is saturating
Mirror projects in sensing chamber after described laser beam shaping.Light receiving unit 9 includes photodiode and plus lens.Converge
Poly-lens are collected the scattered light in sensing chamber 8 and are converged to photodiode, and photodiode receives optical signal and by it
It is converted into voltage pulse signal and sends to signal processing unit.
As shown in Figure 4, signal processing unit includes that the storage of signal amplification unit 121, concentration computing unit 122, data is single
Unit 123 and concentration calibration unit 124.Voltage pulse signal transmits to concentration calculating single after signal amplification unit 121 amplifies
Unit 122, concentration computing unit 122 calculates according to the signal of telecommunication and obtains corresponding PM2.5 concentration signal, and data storage cell 123 is used
With background concn value and the detectable concentration value of PM2.5 of storage PM2.5, concentration calibration unit 124 is according to the PM2.5's stored
The detectable concentration value of PM2.5 is calibrated by background concn value.
Fig. 2 further illustrates the workflow of PM2.5 sensor, that is uses the PM2.5 sensor shown in Fig. 1 to carry out
The flow process of the method for calibration automatically of PM2.5 concentration.Refer to Fig. 2, the detailed step of the automatic calibrating method of the present embodiment is such as
Under.
Step S1: controlling electromagnetic valve, air inlet and calibration gas channel connection, timing unit opens timing simultaneously.
In this step, it is to control electromagnetic valve by electronic valve control unit air inlet is connected with calibration gas passage
Logical.Subsequently air from calibration gas passage become after filtering pure air enter sensing chamber.
Step S2: open laser diode, collection of scattered light is strong, calculates the background concn value of PM2.5.
In sensing chamber, pure air is irradiated forming scattered light by detection light source cell, and light receiving unit receives
Scattered light is also converted into the signal of telecommunication.The signal of telecommunication that signal processing unit produces according to light receiving unit is calculated PM2.5
Background concn value, and store this background concn value.
Step S3: judge that the background concn value of PM2.5, whether less than setting threshold value, if being less than, enters step S4, otherwise
Enter step S5.
Step S4: judge whether timing reaches setting value, if then entering step S6, as otherwise forwarded step S1 to.
Judged whether timing reaches the setting time by the timing subelement in control unit of electromagnetic valve.
Step S5: remind user to clean sensor, then proceed to step S4.
When the background concn value of PM2.5 is less than when setting threshold value, the accumulation of sensor internal dust is described too much, needs cleaning
Sensor.
Step S6: controlling electromagnetic valve, air inlet is connected with detected gas passage.
Illustrate that timing has arrived at the setting time, then sent electromagnetic valve switch switching signal, electronic valve by timing subelement
Switch subelement controls electromagnetic valve according to switch switching signal makes air inlet be connected with detected gas passage.
Step S7: collection of scattered light is strong, calculates the detectable concentration value of PM2.5.
Air is irradiated forming scattered light by the detection light source cell in sensing chamber, and light receiving unit receives scattered light
And it is converted into the signal of telecommunication.It is dense that signal processing unit is calculated PM2.5 detection according to the signal of telecommunication that light receiving unit produces
Angle value, and store this concentration value.
Step S8: the detectable concentration value of PM2.5 is calibrated according to the background concn value of PM2.5.
Calibration subelement in signal processing unit carries out school according to PM2.5 background concn value to PM2.5 detectable concentration value
Standard, thus the PM2.5 concentration value after being calibrated.
Step S9: the concentration value of the PM2.5 after output calibration.
Thering is provided of this disclosure being previously described is for making any person skilled in the art all can make or use these public affairs
Open.Various amendment of this disclosure the most all will be apparent from, and as defined herein general
Suitable principle can be applied to other variants spirit or scope without departing from the disclosure.Thus, the disclosure is not intended to be limited
Due to example described herein and design, but should be awarded and principle disclosed herein and novel features phase one
The widest scope caused.
Claims (9)
1. a PM2.5 sensor, it is characterised in that include detected gas passage, calibration gas passage, detection light source cell,
Light receiving unit, signal processing unit, electromagnetic valve, control unit of electromagnetic valve and sensing chamber, wherein said control unit of electromagnetic valve
Control described electromagnetic valve to switch between described detected gas passage and described calibration gas passage, described calibration gas passage pair
Air filters, and is passed through described sensing chamber after producing clean gas, and described detection light source cell sends light beam, described light-receiving
Unit is acquired and is converted into voltage pulse signal to the scattered light produced, and described signal processing unit is according to receiving
Voltage pulse signal be calculated the background concn value of PM2.5, described detected gas passage directly by extraneous air without
Filter is passed through sensing chamber, is calculated the detectable concentration value of PM2.5, and described signal processing unit utilizes the background of described PM2.5 dense
The detectable concentration value of described PM2.5 is calibrated by angle value, and exports the PM2.5 concentration value after calibration.
PM2.5 sensor the most according to claim 1, it is characterised in that described electromagnetic valve have one with air inlet phase
Air entry even and two gas outlets being connected with described detected gas passage and described calibration gas passage respectively.
PM2.5 sensor the most according to claim 2, it is characterised in that described control unit of electromagnetic valve includes timing
Unit and electromagnetic valve switch subelement, wherein said timing subelement set one determine the time, through described determine the time after
Sending switching signal, described electromagnetic valve switch subelement controls the break-make of described electromagnetic valve according to described switching signal, is used for cutting
Change described detected gas passage and described calibration gas passage.
PM2.5 sensor the most according to claim 3, it is characterised in that described calibration gas passage is provided with filter, institute
State the fine particle in filters trap air, filter to produce clean gas to air.
PM2.5 sensor the most according to claim 4, it is characterised in that described detection light source cell includes laser two pole
Pipe and shaping lens, described laser diode sends laser beam, and described shaping lens will project after described laser beam shaping
In sensing chamber.
PM2.5 sensor the most according to claim 5, it is characterised in that described light receiving unit includes photodiode
And plus lens, described plus lens collects the scattered light in sensing chamber and converged to described photodiode, described light
Electric diode receives optical signal and converts thereof into voltage pulse signal and send to described signal processing unit.
PM2.5 sensor the most according to claim 6, it is characterised in that described signal processing unit includes that signal amplifies
Unit, concentration computing unit, data storage cell and concentration calibration unit, described voltage pulse signal amplifies through described signal
After unit amplifies, transmission obtains corresponding to described concentration computing unit, described concentration computing unit according to signal of telecommunication calculating
PM2.5 concentration signal, described data storage cell is in order to store background concn value and the detection of described PM2.5 of described PM2.5
Concentration value, the detectable concentration value of described PM2.5 is entered by described concentration calibration unit according to the background concn value of the PM2.5 stored
Row calibration.
PM2.5 sensor the most according to claim 7, it is characterised in that described sensor also includes sensor housing, institute
Stating and be provided with air inlet and fan on sensor housing, open described fan, air enters described sensor from described air inlet
And discharge via described fan.
PM2.5 sensor the most according to claim 8, it is characterised in that described detection light source cell and described light-receiving
Unit is respectively positioned in described sensing chamber, and the two ends of described sensing chamber connect inlet channel and exhaust passage respectively, and described aerofluxus is led to
Road is connected with described fan.
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| CN201620719139.6U CN205826470U (en) | 2016-07-08 | 2016-07-08 | A kind of PM2.5 sensor |
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| CN201620719139.6U CN205826470U (en) | 2016-07-08 | 2016-07-08 | A kind of PM2.5 sensor |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106053309A (en) * | 2016-07-08 | 2016-10-26 | 上汽大众汽车有限公司 | PM 2.5 (particulate matter 2.5) sensor and automatic calibration method thereof |
| CN106841536A (en) * | 2017-03-31 | 2017-06-13 | 宇星科技发展(深圳)有限公司 | A kind of VOCs detectors |
| CN108120659A (en) * | 2017-12-01 | 2018-06-05 | 上海先积集成电路有限公司 | A kind of particle concentration detecting system and method having from zero calibration |
| TWI678521B (en) * | 2018-06-15 | 2019-12-01 | 研能科技股份有限公司 | Gas detecting device |
| CN110658114A (en) * | 2018-06-29 | 2020-01-07 | 研能科技股份有限公司 | Gas monitoring device |
| CN112229025A (en) * | 2020-10-13 | 2021-01-15 | 珠海格力电器股份有限公司 | Air purifier control method and device, air purifier and storage medium |
-
2016
- 2016-07-08 CN CN201620719139.6U patent/CN205826470U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106053309A (en) * | 2016-07-08 | 2016-10-26 | 上汽大众汽车有限公司 | PM 2.5 (particulate matter 2.5) sensor and automatic calibration method thereof |
| CN106841536A (en) * | 2017-03-31 | 2017-06-13 | 宇星科技发展(深圳)有限公司 | A kind of VOCs detectors |
| CN108120659A (en) * | 2017-12-01 | 2018-06-05 | 上海先积集成电路有限公司 | A kind of particle concentration detecting system and method having from zero calibration |
| TWI678521B (en) * | 2018-06-15 | 2019-12-01 | 研能科技股份有限公司 | Gas detecting device |
| CN110658114A (en) * | 2018-06-29 | 2020-01-07 | 研能科技股份有限公司 | Gas monitoring device |
| CN112229025A (en) * | 2020-10-13 | 2021-01-15 | 珠海格力电器股份有限公司 | Air purifier control method and device, air purifier and storage medium |
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