CN105181544A - Detection device and detection method for concentration of particulate matter in air - Google Patents
Detection device and detection method for concentration of particulate matter in air Download PDFInfo
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- CN105181544A CN105181544A CN201510603750.2A CN201510603750A CN105181544A CN 105181544 A CN105181544 A CN 105181544A CN 201510603750 A CN201510603750 A CN 201510603750A CN 105181544 A CN105181544 A CN 105181544A
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Abstract
The invention provides a detection device for detecting the concentration of particulate matter in air. The device comprises an air flow channel, a detection unit, a detection result calculation unit and an air speed measurement unit; air outside the detection device enters the air flow channel, and the detection unit is arranged on the air flow channel and converts relevant information of the particulate matter in the air into electric signals; meanwhile, the air speed measurement unit acquires the flow speed of the air entering the air flow channel, and the detection result calculation unit calculates the concentration of the particulate matter in the air according to the electric signals output by the detection unit and the flow speed acquired by the air speed measurement unit. The invention further provides a detection method for detecting the concentration of the particulate matter in the air by means of the detection device.
Description
Technical field
The present invention relates to a kind of pick-up unit measuring particulate in air concentration, particularly relate to a kind of pick-up unit of the Accurate Measurement particulate in air concentration when gas flow rate the unknown.
Technical background
In many fields of productive life, need to detect the parameter such as concentration or quantity of particle, the detection of the particle such as, discharged in factory's flue; The detection of atmospheric dust in environment; The detection of inflammable and explosive dust under ore deposit; And the particulate matter sensors etc. of the air cleaning facility of commercialization or family expenses.The detection method of particle mainly contains screening, microscope, sedimentation, electro-induction, light scattering method etc., wherein the light scattering method test duration is short, can continuous coverage, avoid the drawback that the factors such as climate change, humidity change affect Detection results, and there is no maintenance work as comparatively loaded down with trivial details in periodic replacement filter membrane etc., therefore applied widely, development rapidly, is current reasonable granule detection method.
But at present when using light scattering method to detect particulate in air concentration, the type of drive of the air-flow that particle concentration pick-up unit used uses mainly contains two kinds: active and passive type; Active detection device can adopt fans drive to make tested gas steady flow, and heater block can also be adopted to heat the flowing of tested gas-powered gas; Passive type pick-up unit not active drive gas flows but utilizes the natural flow of tested gas or the flowing of external drive gas to make tested gas by tested district.The result major part of the concentration of the sensor measurement particulate in air of current employing passive type is all inaccurate, and main cause is that tested gas flow rate can have a significant impact measurement result.When gas flow rate changes, sensor cannot continue to provide testing result accurately, needs user compensate voluntarily or calculate.
Summary of the invention
In order to solve the problems of the technologies described above, the invention provides a kind of pick-up unit detecting particulate in air concentration, comprise gas channel, detecting unit, testing result computing unit and measuring wind speed unit; Air outside described pick-up unit enters described gas channel, described detecting unit to be arranged on described gas channel and to convert the relevant information of described particulate in air to electric signal, simultaneously described measuring wind speed unit obtain described in enter the air velocity of gas channel, the concentration of the flow relocity calculation particulate in air of the electric signal that testing result computing unit exports according to detecting unit and the acquisition of described measuring wind speed unit.
Preferably, described measuring wind speed unit comprises heat generating components and information process unit; Described information process unit, by the temperature of the environment at described pick-up unit place be positioned at the thermal equilibrium temperature of heat generating components of described gas channel and heating power processes, determines air velocity.
Preferably, described measuring wind speed unit also comprises reference ambient temperature detecting unit and heat generating components temperature detecting unit; Described reference ambient temperature detecting unit detects the temperature of the environment at described pick-up unit place; Described heat generating components temperature detecting unit detects thermal equilibrium temperature and the heating power of the heat generating components be arranged in described gas channel.
Preferably, described heat generating components temperature detecting unit and described heat generating components are realized by a spontaneous heating temperature detecting unit.
Preferably, heat generating components in described gas channel is issued to thermal equilibrium at a predetermined thermal equilibrium temperature, and described measuring wind speed unit is according to the fixing thermal equilibrium temperature of heat generating components under thermal equilibrium state, the temperature of environment at described pick-up unit place and the heating power determination air velocity of heat generating components.
Preferably, heat generating components in described gas channel is issued to thermal equilibrium at fixing heating power, and described measuring wind speed unit is according to the temperature determination air velocity of fixing heating power, the thermal equilibrium temperature of described heat generating components and the environment at described pick-up unit place of heat generating components under thermal equilibrium state.
Preferably, described heat generating components is negative tempperature coefficient thermistor parts.
Preferably, described detecting unit is the optical detection unit be made up of luminous component and light receiving component; The electric signal that the radiative electric signal of luminous component that described testing result computing unit obtains according to described detecting unit and light receiving component receive light calculates particulate in air concentration.
Preferably, described testing result computing unit utilizes described air velocity to compensate described particle concentration.
Preferably, described gas channel arranges turning structure, and in described turning arranged outside pore structure, for reducing the flow velocity of air entering described gas channel, bulky grain thing is thrown away gas channel simultaneously.
Preferably, described reference ambient temperature detecting unit is positioned at the outside of the pore structure at described gas channel turning, or is positioned at the upstream of described gas channel surveyed area; Described heat generating components temperature detecting unit or spontaneous heating temperature detecting unit are arranged in the downstream of described gas channel surveyed area; Described surveyed area is the overlapping region that luminous component utilizing emitted light region and light receiving component receive light region.
The invention provides a kind of detection method detecting particulate in air concentration, comprising: electric signal obtaining step, air enters gas channel, and detecting unit in gas channel obtains electric signal corresponding to the relevant information of particulate in air; Air velocity obtaining step, enters the air velocity of gas channel described in acquisition; Particle concentration obtaining step, the electric signal obtained according to detecting unit and described air velocity calculate the concentration of particulate in air.
Preferably, air velocity obtaining step comprises environment temperature obtaining step and thermal equilibrium temperature obtaining step; In described environment temperature obtaining step, reference ambient temperature detecting unit obtains the environment temperature at pick-up unit place; In described thermal equilibrium temperature obtaining step, heat generating components temperature detecting unit detects thermal equilibrium temperature and the heating power of the heat generating components be arranged in described gas channel, or spontaneous heating temperature detecting unit detects thermal equilibrium temperature and the heating power of therein heat generating components.
Preferably, in described air velocity obtaining step, measuring wind speed unit obtains the heating power of heat generating components according to the stationary heat equilibrium temperature of the heat generating components in gas channel, the temperature determination air velocity of the environment at the pick-up unit place that heating power, fixing thermal equilibrium temperature and environment temperature obtaining step when described measuring wind speed unit reaches thermal equilibrium according to heat generating components obtain.
Preferably, in described air velocity obtaining step, measuring wind speed unit obtains the thermal equilibrium temperature of heat generating components according to the fixing heating power of the heat generating components in gas channel, the temperature determination air velocity of the environment at the pick-up unit place that thermal equilibrium temperature, fixing heating power and environment temperature obtaining step when described measuring wind speed unit reaches thermal equilibrium according to heat generating components obtain.
Preferably, described heat generating components is negative tempperature coefficient thermistor parts.
Preferably, described detecting unit is the optical detection unit be made up of luminous component and light receiving component; In described electric signal obtaining step, described detecting unit obtains the electric signal of the radiative electric signal of luminous component and light receiving component reception light.
Preferably, in described particle concentration obtaining step, the electric signal of the light that the electric signal of the light that testing result computing unit is launched according to the luminous component obtained in electric signal obtaining step and light receiving component receive calculates particulate in air concentration.
Preferably, in described particle concentration obtaining step, testing result computing unit utilizes the air velocity determined in described air velocity obtaining step to compensate described particle concentration.
The particle pick-up unit that the present invention relates to flows through the wind speed of the air-flow of described pick-up unit by measuring, detect particulate in air concentration compensate with wind speed to employing light scattering method, thus obtains more accurate particle concentration.This kind of method can measure the concentration of the particle under different wind speed.And do not use movable part in described pick-up unit, ensure that the serviceable life of sensor element.
Accompanying drawing explanation
Fig. 1 is the principle schematic of the particle pick-up unit that embodiment of the present invention relates to;
Fig. 2 is the structural representation of the measuring wind speed unit that the first embodiment of the present invention relates to;
Fig. 3 is an example of the schematic diagram of the gas channel that embodiment of the present invention relates to;
Fig. 4 is the heat-generating units that relates to of the first embodiment of the present invention and described heater element measuring unit position view;
Fig. 5 is the process flow diagram of the particle pick-up unit detection particle concentration that the first embodiment of the present invention relates to;
Fig. 6 is the structural representation of the measuring wind speed unit that the second embodiment of the present invention relates to.
Embodiment
Illustrated embodiment sets forth the present invention with reference to the accompanying drawings below.This time disclosed embodiment can be thought and is illustration in all respects, and tool is not restricted.Scope of the present invention not limit by the explanation of following embodiment, only by shown in the scope of claims, and comprises and to have same looking like and all distortion in right with right.
Below in conjunction with embodiment, particle pick-up unit of the present invention is described.
Fig. 1 is the principle schematic of the particle pick-up unit that embodiment of the present invention relates to.The particle pick-up unit of present embodiment comprises gas channel 1, measuring wind speed unit 2, luminescence unit 3, light receiving unit 4, signal adjustment unit 5, signal processing unit 6 and data outputting unit 7.Gas channel 1 is arranged in the darkroom in device, avoids the impact by ambient light.Luminescence unit 3 and light receiving unit 4 are arranged at the side of gas channel 1, and luminescence unit 3 irradiates light to gas channel 1, and light receiving unit 4 is arranged on the position that can receive scattered light.Light receiving unit 4 is photoelectric conversion device, and the scattered light received is converted to electric signal, is adjusted by signal adjustment unit 5 pairs of electric signal, and the result after adjustment is sent to signal processing unit 6.Measuring wind speed unit 2 comprises temperature sensor component, can be positioned at described gas channel, can obtain the temperature information of air-flow in gas channel, and the temperature information of acquisition is sent to signal processing unit 6.The signal that signal processing unit 6 exports according to signal adjustment unit 5 and measuring wind speed unit 2 processes, and obtains more accurate particle concentration.
Particle concentration pick-up unit of the present embodiment, needs the mobility (wind speed) of the air-flow of reference stream in the gas channel of described pick-up unit when calculating the concentration of the particle in air.In the present embodiment, obtaining more accurate particle concentration can first by the concentration of common light scattering method Preliminary detection particulate in air, then calculate the speed of air draught, and by the flow velocity of air-flow the particle concentration that light scattering method tentatively records compensated thus obtain more accurate particle concentration information.The calculating parameter of described wind speed can be obtained by the temperature sensor component of measuring wind speed unit 2.
Present embodiment is further illustrated below in conjunction with specific embodiment.
embodiment 1
Fig. 2 is the structural representation of the measuring wind speed unit 2 that the present embodiment relates to.The measuring wind speed unit 2 of the present embodiment comprises heat-generating units 21, heater element measuring unit 22 and reference temperature measuring unit 23.Described heat-generating units 21 can generate heat, and is preferably the element such as resistance or triode; Described heater element measuring unit 22 is temperature sensor component, the temperature of heat-generating units 21 can be measured and heat-generating units 21 heating power P under certain condition can be obtained, and the temperature information of acquisition and heating power information are sent to signal processing unit 6; When heat-generating units 21 is placed under certain environment, described heater element measuring unit 22 can measure temperature when heat-generating units 21 reaches thermal equilibrium in the present context.In the present embodiment, during described heat-generating units 21 reaches thermal equilibrium, the minimizing of heat causes because air flows, and namely the heat of heat-generating units 21 is taken away by wind, makes heat-generating units 21 reach thermal equilibrium.Described thermally equilibrated criterion be the temperature of heat-generating units 21 reach stable (standard of judgement can be heat-generating units per second within continuous 5 second time in temperature variation be less than 0.05 degree, can also be other standard).Described heat-generating units 21 and described heater element measuring unit 22 position as far as possible close, and both are positioned at gas channel 1, are preferably located in surveyed area 8(as shown in Figure 1) downstream position (described downstream is the positive dirction side of air flow).Described surveyed area 8 is the area of space that emitting area (can regard as right cylinder) after described luminescence unit 3 launches infrared light and described light receiving unit 4 receive the overlap of the receiving area (also can regard right cylinder as) of infrared light.Described reference temperature measuring unit 23 is temperature sensor component, it can be such as thermistor temperature sensor, the temperature of the environment at pick-up unit place can be obtained, preferably described reference temperature measuring unit 23 is installed on the upstream position (described upstream is the reciprocal side of air flow) that described gas channel 1 places luminescence unit 3, light receiving unit 4, also can be installed on other positions of pick-up unit; And the temperature of the environment of acquisition is sent to described signal processing unit 6.The environment temperature that the temperature of the heat-generating units 21 that described signal processing unit 6 is obtained by heater element measuring unit 22 and reference temperature measuring unit 23 obtain calculates the wind speed entering gas channel 1, and its principle is the size that the heat taking away heat-generating units 21 by calculating wind carrys out calculation of wind speed.
Preferably, described heat-generating units 21, heater element measuring unit 22 and reference temperature measuring unit 23 are positioned at described gas channel.But pick-up unit volume is limited usually, and described gas channel 1 space may be also very little, and position may do not had to place described reference temperature measuring unit 23.So the structure of turning can be arranged on described gas channel, and open aperture outside the turning of gas channel simultaneously, and described reference temperature measuring unit 23 is arranged at the outside of the aperture of described gas channel 1.The turning structure of said flow passage and the setting of aperture can enable the excessive wind speed entered wherein be reduced in the temperature sensor component valid analysing range of described measuring wind speed unit 2; Particle larger in air-flow can also be made to throw away gas channel due to inertia, thus filter out king-sized particle.The channel shape of such as described gas channel 1 can be shape as shown in Figure 3, described gas channel there is turning structure, when the first turning 12 arranged outside aperture 11 makes air-flow enter into gas channel 1, some air-flow can be blown on described reference temperature measuring unit by described aperture 11, enables described reference temperature measuring unit obtain the environment temperature at pick-up unit place; The center 14 of gas channel is led at second turning 13, and air-flow circulates (as shown in Figure 4) through vertical channel 15 after arriving center 14.
In described pick-up unit, need the parts such as described heat-generating units 21, heater element measuring unit 22 and reference temperature measuring unit 23 to be welded on circuit board.When making circuit board (as pcb board), described heat-generating units 21 and the position of described heater element measuring unit 22 on pcb board should be separated with the position of other parts on pcb board as much as possible, so that heat is dissipated by wind when making heat-generating units 21 reach thermal equilibrium, reduce the impact that the parts such as other unit dispel the heat on heat-generating units 21.Such as shown in Figure 4, described heat-generating units 21 and described heater element measuring unit 22 are positioned on the vertical channel 15 of described gas channel 1, and separate mutually with the miscellaneous part on pcb board.
Pick-up unit of the present embodiment also comprises drive unit (not shown), and described drive unit can drive luminescence unit 3 utilizing emitted light signal, and preferably described luminescence unit 3 can launch infrared light; Described luminescence unit 3 can record described radiative electrical signal information, and the electric signal of record is sent to described signal adjustment unit 5.Described luminescence unit 3 launches infrared light in described gas channel 1, when infrared illumination is mapped on particle, scattering can be there is, because described light receiving unit 4 is arranged on the position that can receive scattered light, so described light receiving unit 4 can receive described scattered light, and the scattered light received is converted to corresponding electric signal, described electric signal is sent to signal adjustment unit 5 by light receiving unit 4 simultaneously.The scattered light received and radiative electric signal adjust by described signal adjustment unit 5, and the information such as the electric signal after adjustment are sent to described signal processing unit 6.Described signal processing unit 6 calculates the concentration of particulate in air according to information such as the electric signal received and air-flow wind speed, and the particle concentration of calculating is sent to described data outputting unit 7.Described data outputting unit 7 can be connected with display screen (not shown) or other external device, for user provides reference.
Fig. 5 is the pick-up unit overhaul flow chart of the particle concentration that the present embodiment relates to.First drive unit drives luminescence unit 3 to gas channel 1 utilizing emitted light signal, records described radiative electrical signal information simultaneously
x tx , and by described electrical signal information
x tx be sent to signal adjustment unit 5(step S1).There is scattering in described utilizing emitted light, light receiving unit 4 receiving scattered light after the particle in gas channel, and described scattered light signal is converted to corresponding electric signal
x rx , and be sent to (step S2) in signal adjustment unit 5.Signal adjustment unit 5 is to the radiative electrical signal information received
x tx and scattered light electric signal
x rx adjust, and the data message after adjustment is sent to information process unit (step S3).Information process unit is according to the radiative electrical signal information after adjustment
x tx and scattered light electric signal
x rx etc. data, obtain the preliminary concentration of particulate in air
z=fun(
x tx ,
x rx ) (step S4).Described reference temperature measuring unit 23 is measured and is obtained environment temperature simultaneously
t base, the thermal equilibrium temperature of heat-generating units 21 when described heater element measuring unit 22 is measured and obtains airflow passes gas channel
t windand heat-generating units 21 reaches the heating power in thermal equilibrium process
p, and by described environment temperature
t base, thermal equilibrium temperature
t windand heating power
pbe sent to signal processing unit 6(step S5).Signal processing unit 6 is according to described environment temperature
t base, thermal equilibrium temperature
t windand heating power
pcalculate the wind speed entering pick-up unit
v=fun (
t base,
t wind,
p) (step S6).Signal processing unit is according to the preliminary concentration of wind speed and particulate in air
zthe concentration of count particles thing
y=fun(
z,
v), and the concentration of described particle is sent to data outputting unit (step S7).
embodiment 2
In embodiment 1, described measuring wind speed unit 2 comprises heat-generating units 21, heater element measuring unit 22 and reference temperature measuring unit 23, described heat-generating units 21 and heater element measuring unit 22 position need as far as possible close, the sensor element of heater element measuring unit 22 just can be made better to measure the thermal equilibrium temperature of described heat-generating units 21 more accurately, but described heat-generating units 21, with described heater element measuring unit 22, position may occur when actual installation to be departed from, affect the measurement of described heater element measuring unit 22.In addition, described heat-generating units 21, heater element measuring unit 22 and reference temperature measuring unit 23 are installed in air flow duct 1 by usual needs, but described air flow duct 1 limited space, makes reference temperature measuring unit 23 likely can not be installed in air flow duct.
In order to solve the problem, the present embodiment uses spontaneous heating temperature measurement unit 24 to replace heat-generating units 21 and heater element measuring unit 22, namely saves the thermal equilibrium temperature that installing space can also measure relevant components and parts more accurately.
As shown in Figure 6, described in the present embodiment 2, measuring wind speed unit 2 comprises spontaneous heating temperature measurement unit 24 and reference temperature measuring unit 23, described spontaneous heating temperature measurement unit 24 is built-in with temperature sensor component and heat generating components, and described temperature sensor component can be the thermistor temperature sensor of little resistance.Thermistor temperature sensor power under certain voltage conditions of described little resistance is comparatively large, generates heat more; Thermistor has PTC(positive temperature coefficient (PTC)) and NTC(negative temperature coefficient) two kinds, preferably, in the thermistor temperature sensor in present embodiment, use NTC(negative temperature coefficient) thermistor.Described spontaneous heating parts can be the element such as resistance or triode; Described spontaneous heating temperature measurement unit 24 is arranged in gas channel 1, little relative to the volume of the heat-generating units 21 in embodiment 1 and heater element measuring unit 22, saves space.When have in gas channel 1 air-flow by time, described spontaneous heating temperature measurement unit 24 can obtain the temperature after self spontaneous heating parts thermal equilibrium, and described temperature signal is sent to signal processing unit 6.The function of other unit in the present embodiment is identical with embodiment 1, is not repeated.
Roughly the same with the flow process described in embodiment 1 in the pick-up unit testing process of the particle concentration described in the present embodiment, wherein step 1 ~ 3, step 5 are identical with embodiment 1 with 6, and be not repeated, wherein step S4 has any different.In the detecting step of the present embodiment, in step s 4 which, described reference temperature measuring unit 23 is measured and is obtained environment temperature
t base, the thermal equilibrium temperature of therein heat generating components when described spontaneous heating temperature measurement unit 24 is measured and obtains airflow passes gas channel
t windand corresponding heating power
p, and by described environment temperature
t base, thermal equilibrium temperature
t windand heating power
pbe sent to signal processing unit 6, then carry out the process of step S5.
In the present embodiment, the heat-generating units of embodiment 1 and the spontaneous heating temperature measurement unit 24 of embodiment 2 can incorporating resistance element as heat generating components, when heat generating components reaches thermal equilibrium state, obtain wind speed by environment temperature, thermal equilibrium temperature and heating power.Thermal equilibrium state can be reached by the following method: 1, use the resistance of fixed resistance value as heat generating components, when fixed resistance when working under certain voltage or electric current, the heating power of heat generating components is constant, when reaching thermal equilibrium state, use fixing heating power and other parameters to carry out calculating and can obtain air velocity, such control flow is fairly simple, and due to heating power constant, the calculating of air velocity is also fairly simple.2, use the resistance of fixed resistance value or resistance value changeable terminals as heat generating components, limit a fixing thermal equilibrium temperature.When heat generating components does not reach this thermal equilibrium temperature, the thermal value of heat generating components can be increased by increasing curtage for fixed resistance, the thermal value of heat generating components can be increased by increasing resistance for variable resistor, it can be made to reach thermal equilibrium temperature as early as possible, can corresponding reduction electric current, voltage or resistance value when exceeding thermal equilibrium temperature.Like this, thermal equilibrium temperature is fixed value, and control flow and computation process can be made equally to simplify.Except above two kinds of methods, heating power and thermal equilibrium can also be made not to fix, such as, use larger heating power in the temperature rise period, be elevated in temperature and to a certain degree use less heating power to reaching thermal equilibrium state afterwards.Thermal equilibrium can be arrived fast like this, also image space method 2 equally repeatedly need not adjust heating power for reaching a fixing thermal equilibrium temperature, but need more complicated control algolithm, also higher to the performance requirement of control device.
The concentration of the particulate in air of calculating is sent to described data outputting unit by described signal processing unit, and is shown on external device, but is not limited only to this.The information such as the wind speed of calculating, radiative heating power and electric signal and the electric signal of scattered light that receives also are sent to described data outputting unit by described signal processing unit, and are sent on the external device that is connected with data outputting unit.
In the present embodiment, when signal processing unit calculates the concentration of particulate in air, first according to radiative electrical signal information
x tx and scattered light electric signal
x rx etc. data, calculate the preliminary concentration of particulate in air; Then environment temperature is passed through
t baseand thermal equilibrium temperature
t wind, heating power
pcalculate the flow velocity entering the air of pick-up unit; The preliminary concentration of the particle described in the compensation of the flow velocity of air is finally utilized to calculate the Exact concentrations of particulate in air.But be not limited only to this, signal processing unit can according to radiative electrical signal information
x tx , heating power
p, scattered light electric signal
x rx , environment temperature
t baseand thermal equilibrium temperature
t windthe Exact concentrations of direct calculating particulate in air
y=fun (
x tx,
x rx,
t wind,
t base,
p).
Claims (19)
1. detect a pick-up unit for particulate in air concentration, comprise gas channel, detecting unit, testing result computing unit and measuring wind speed unit;
Air outside described pick-up unit enters described gas channel, described detecting unit to be arranged on described gas channel and to convert the relevant information of described particulate in air to electric signal, simultaneously described measuring wind speed unit obtain described in enter the air velocity of gas channel, the concentration of the flow relocity calculation particulate in air of the electric signal that testing result computing unit exports according to detecting unit and the acquisition of described measuring wind speed unit.
2. the pick-up unit of particle concentration according to claim 1, is characterized in that:
Described measuring wind speed unit comprises heat generating components and information process unit;
Described information process unit, by the temperature of the environment at described pick-up unit place be positioned at the thermal equilibrium temperature of heat generating components of described gas channel and heating power processes, determines air velocity.
3. the pick-up unit of particle concentration according to claim 2, is characterized in that:
Described measuring wind speed unit also comprises reference ambient temperature detecting unit and heat generating components temperature detecting unit;
Described reference ambient temperature detecting unit detects the temperature of the environment at described pick-up unit place;
Described heat generating components temperature detecting unit detects thermal equilibrium temperature and the heating power of the heat generating components be arranged in described gas channel.
4. the pick-up unit of particle concentration according to claim 3, is characterized in that:
Described heat generating components temperature detecting unit and described heat generating components are realized by a spontaneous heating temperature detecting unit.
5. the pick-up unit of particle concentration according to claim 3, is characterized in that:
Heat generating components in described gas channel is issued to thermal equilibrium at a predetermined thermal equilibrium temperature, and described measuring wind speed unit is according to the fixing thermal equilibrium temperature of heat generating components under thermal equilibrium state, the temperature of environment at described pick-up unit place and the heating power determination air velocity of heat generating components.
6. the pick-up unit of particle concentration according to claim 3, is characterized in that:
Heat generating components in described gas channel is issued to thermal equilibrium at fixing heating power, and described measuring wind speed unit is according to the temperature determination air velocity of fixing heating power, the thermal equilibrium temperature of described heat generating components and the environment at described pick-up unit place of heat generating components under thermal equilibrium state.
7. the pick-up unit of particle concentration according to claim 2, is characterized in that:
Described heat generating components is negative tempperature coefficient thermistor parts.
8. the pick-up unit of the particle concentration according to claim 5 or 6, is characterized in that:
Described detecting unit is the optical detection unit be made up of luminous component and light receiving component;
The electric signal that the radiative electric signal of luminous component that described testing result computing unit obtains according to described detecting unit and light receiving component receive light calculates particulate in air concentration.
9. the pick-up unit of particle concentration according to claim 8, is characterized in that:
Described testing result computing unit utilizes described air velocity to compensate described particle concentration.
10. the pick-up unit of particle concentration according to claim 4, is characterized in that:
Described gas channel arranges turning structure, and in described turning arranged outside pore structure, for reducing the flow velocity of air entering described gas channel, bulky grain thing is thrown away gas channel simultaneously.
The pick-up unit of 11. particle concentrations according to claim 10, is characterized in that:
Described reference ambient temperature detecting unit is positioned at the outside of the pore structure at described gas channel turning, or is positioned at the upstream of described gas channel surveyed area;
Described heat generating components temperature detecting unit or spontaneous heating temperature detecting unit are arranged in the downstream of described gas channel surveyed area;
Described surveyed area is the overlapping region that luminous component utilizing emitted light region and light receiving component receive light region.
12. 1 kinds of detection methods detecting particulate in air concentration, comprising:
Electric signal obtaining step, air enters gas channel, and detecting unit in gas channel obtains electric signal corresponding to the relevant information of particulate in air;
Air velocity obtaining step, enters the air velocity of gas channel described in acquisition;
Particle concentration obtaining step, the electric signal obtained according to detecting unit and described air velocity calculate the concentration of particulate in air.
The detection method of 13. particle concentrations according to claim 12, is characterized in that:
Air velocity obtaining step comprises environment temperature obtaining step and thermal equilibrium temperature obtaining step;
In described environment temperature obtaining step, reference ambient temperature detecting unit obtains the environment temperature at pick-up unit place;
In described thermal equilibrium temperature obtaining step, heat generating components temperature detecting unit detects thermal equilibrium temperature and the heating power of the heat generating components be arranged in described gas channel, or spontaneous heating temperature detecting unit detects thermal equilibrium temperature and the heating power of therein heat generating components.
The detection method of 14. particle concentrations according to claim 13, is characterized in that:
In described air velocity obtaining step, measuring wind speed unit obtains the heating power of heat generating components according to the stationary heat equilibrium temperature of the heat generating components in gas channel, the temperature determination air velocity of the environment at the pick-up unit place that heating power, fixing thermal equilibrium temperature and environment temperature obtaining step when described measuring wind speed unit reaches thermal equilibrium according to heat generating components obtain.
The detection method of 15. particle concentrations according to claim 13, is characterized in that:
In described air velocity obtaining step, measuring wind speed unit obtains the thermal equilibrium temperature of heat generating components according to the fixing heating power of the heat generating components in gas channel, the temperature determination air velocity of the environment at the pick-up unit place that thermal equilibrium temperature, fixing heating power and environment temperature obtaining step when described measuring wind speed unit reaches thermal equilibrium according to heat generating components obtain.
The detection method of 16. particle concentrations according to claim 13, is characterized in that:
Described heat generating components is negative tempperature coefficient thermistor parts.
The detection method of 17. particle concentrations according to claims 14 or 15, is characterized in that:
Described detecting unit is the optical detection unit be made up of luminous component and light receiving component;
In described electric signal obtaining step, described detecting unit obtains the electric signal of the radiative electric signal of luminous component and light receiving component reception light.
The detection method of 18. particle concentrations according to claim 17, is characterized in that:
In described particle concentration obtaining step, the electric signal of the light that the electric signal of the light that testing result computing unit is launched according to the luminous component obtained in electric signal obtaining step and light receiving component receive calculates particulate in air concentration.
The detection method of 19. particle concentrations according to claim 18, is characterized in that:
In described particle concentration obtaining step, testing result computing unit utilizes the air velocity determined in described air velocity obtaining step to compensate described particle concentration.
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| CN106442240A (en) * | 2016-08-30 | 2017-02-22 | 深圳益杉创新科技有限公司 | Method and device for detecting concentration of peripheral particulate matters of air processing device |
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| CN106959262B (en) * | 2017-03-31 | 2023-09-26 | 中煤科工集团重庆研究院有限公司 | Unpowered dust detection system, device and detection method based on optics |
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| CN108613907A (en) * | 2018-07-04 | 2018-10-02 | 汉王科技股份有限公司 | Particulate matter detection means |
| CN110018088A (en) * | 2019-03-05 | 2019-07-16 | 中国矿业大学 | A kind of opencut dust dirt environment simulation test system and method |
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