CN207457013U - A kind of optical particle sensors of double working modes - Google Patents
A kind of optical particle sensors of double working modes Download PDFInfo
- Publication number
- CN207457013U CN207457013U CN201721409215.4U CN201721409215U CN207457013U CN 207457013 U CN207457013 U CN 207457013U CN 201721409215 U CN201721409215 U CN 201721409215U CN 207457013 U CN207457013 U CN 207457013U
- Authority
- CN
- China
- Prior art keywords
- light
- particle
- signal processing
- processing unit
- light source
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Abstract
A kind of optical particle sensors of double working modes, including：Light sensing module, the collimation detection light of internal light receiving unit sensing internal light source unit transmitting, which is projected to after particle sensing area caused by KPT Scatter to scatter light and convert, exports corresponding electric signal；Light source control unit is used to drive and control the working condition of light source unit in light sensing module；And signal processing unit, the electric signal for receiving the output of light sensing module carry out signal processing and calculate and export the particle concentration detected.The optical particle sensors of the double working modes are alternately operated in two kinds of operating modes of light scattering photometer method and light diffusing particles counting method.The first calibration value of light scattering photometer method operating mode and the second calibration value of light diffusing particles counting method operating mode are stored in signal processing unit, and there is the correlation particle concentration scope of each definite correspondence between the first and second calibration values.
Description
Technical field
The utility model is related to sensor technical field, more particularly to a kind of surrounding air particle sensor.
Background technology
In recent years, airborne particles (airborne particle) are received as one of pollutant important in air
Concern.Airborne particles are very harmful to the mankind, especially small particle particle, can fly at for a long time in air, it is difficult to heavy
Ground is dropped to, easily into human respiratory tract, and grain size is smaller, and the sedimentation location in human respiratory tract is deeper, and harm is bigger.
《Ambient air quality》The airborne particles of aerodynamics equivalent diameter≤10 μm in surrounding air are known as to inhale
Enter particulate matter PM10, the particle of aerodynamics equivalent diameter≤2.5 μm in surrounding air is known as fine particle PM2.5.
PM10 is easily deposited on the upper respiratory tract, triggers various diseases；PM2.5 can be deposited on bronchus and lung, and be more easy to be adsorbed with
The substance of murder by poisoning is detrimental to health into vivo.Therefore, it is aobvious to the accurate measurement of air borne particle concentration in surrounding air
It obtains increasingly important.Particle sensor (particle sensor) based on optical principle is at home and abroad largely used at present, by
In its miniaturization, real-time the features such as sensing and is at low cost, it is widely used in air purifier, fresh air system, air-conditioning, air matter
The equipment such as amount detecting device.
Light source unit, light receiving unit, light path design, signal processing and the particle sensing algorithm of optical particle sensors
The design of (particle sensing algorithm) etc. is had nothing in common with each other.For example, light emitting unit mainly has infrared light
And laser, light emitting unit operating mode mainly have continuous luminous and pulsed light emissions, particle concentration sensing principle is dissipated including light
Penetrate photometer measuring method (light scattering photometers method) and light diffusing particles counting method (light
scattering particle counter method).The product characteristic of the optical particle sensors of different designs respectively has not
Together, the grain size sensitivity including sensor (particle size sensitivity, you can the grain size of the smallest particles of measurement, with
And the particle measurement accuracy of different-grain diameter), resolution ratio (resolution), range (detection range), measurement accuracy
(accuracy), response time (response time), measurement reproducibility and long-time stability (measurement
Repeatability and long-term stability), curve of output drift characteristic (output curve drift
Characteristics), the product characteristic of service life and product cost etc. respectively has advantage and disadvantage.
On the other hand, after the particle sensor long-time service of optical principle light source unit light intensity attenuation, sensor internal
The light path characteristic variations that dust stratification and light channel structure part deform etc. caused by factors, the characteristic changing of sensor other component,
And the factors such as humiture variation of sensor running environment, the output characteristics for causing sensor is changed, is thus led
The measurement output of sensor is caused to generate larger error, measurement data drift in other words is serious.
Utility model content
In essential characteristic, the utility model provides a kind of optical particle sensors of double working modes and its environment sky
Gas particle concentration detection method, output characteristics drift (drift) problem be effectively improved, and improve particle sensor and
The measurement accuracy of its detection method.
In the one side of the utility model, the optical particle sensors of the double working modes include：Light sensing module,
The collimation detection light of its internal light receiving unit sensing internal light source unit transmitting is dissipated after being projected to particle sensing area by particle
Scattering light caused by penetrating simultaneously converts the corresponding electric signal of output；Light source control unit is used to drive and controls light sensing mould
The working condition of light source unit in group；And signal processing unit, the electric signal for receiving the output of light sensing module carry out signal
It handles and calculates and export the particle concentration detected.
In some embodiments, which further includes by the electrical control electric fan of signal processing unit control work,
For introducing controlled airflow (controlled air flow) to the particle sensing area of light sensing module.
The optical particle sensors of the double working modes are alternately operated in light scattering photometer method (light
Scattering photometers method) and light diffusing particles counting method (light scattering particle
Counter method) two kinds of operating modes.
During the light scattering photometer method operating mode, electric signal caused by light sensing module one granule of sensing is believed
After number processing unit performs filter and amplification, sampling and digitized processing, formed directly related with sensed KPT Scatter luminous intensity
Aptitude unit (aptitude units) value.Aptitude (aptitude) information is remembered again via signal processing unit
Record, analysis and calculating, the first particle concentration that the first calibration value output then referring to storage detects.First calibration value
For the correspondence of default aptitude data and particle concentration value in signal processing unit.
In some embodiments, during light scattering photometer method operating mode, light source control unit is with predetermined length and frequency
Pulse signal drive and control the light source unit in light sensing module send pulse detection light, signal processing unit is with light source
Setting duration of the control unit pulse signal starting after samples the electric signal after filter and amplification.
In some embodiments, during light scattering photometer method operating mode, light source control unit is with predetermined length and frequency
Pulse signal drive and control the light source unit in light sensing module to send pulse detection light, signal processing unit passes through it
Comprising peak detection circuit with based on light source control unit pulse signal when ordered pair filter and amplification after the electric signal
Peak value is sampled.
During the light diffusing particles counting method operating mode, light sensing module senses an a series of system caused by particle groups
After column electrical signal performs filter and amplification, sampling and digitized processing by signal processing unit, formed and sensed KPT Scatter light
A series of directly related pulses of signal.The amplitude (amplitude) of this series of pulse and spacing (spacing, in other words arteries and veins
Rush frequency) information records via signal processing unit, analyzes and calculates again, export detection then referring to the second calibration value of storage
The second particle concentration arrived, and relevant droplet measurement information is determined to a certain extent.Second calibration value is at signal
Manage a series of amplitude of default pulses and spacing data and grain size and the correspondence of particle concentration value in unit.
In some embodiments, during light diffusing particles counting method operating mode, signal processing unit also exports what is detected
Particle density, the corresponding pass of the spacing data comprising a series of default pulses and particle density value in second calibration value
System.
In some embodiments, during light diffusing particles counting method operating mode, light source control unit is driven with continuous signal
Light source unit in dynamic and control light sensing module sends continuous detection light, and signal processing unit is with the sample rate that sets to filter
The amplified electric signal of ripple carries out continuous sampling.
In the other side of the utility model, the surrounding air of the double working modes propagates particle concentration detection method
Including following work step：
The particle sensor includes in calibration and preset mode：In metastable surrounding air particle concentration condition
Under, alternately first calibration value is demarcated and preset using light scattering photometer method operating mode and use light scattering grain
Second calibration value is demarcated and preset to sub-count method operating mode, so that first and second calibration values are same
One or close particle concentration value under determine the amplitude and spacing of corresponding aptitude data and a series of pulses respectively
Data so that first and second calibration values in the range of certain particle concentration determine respective aptitude data and
There is each definite correspondence between a series of amplitude of pulses and the correspondence of spacing data, i.e. the first and second calibration values
The correlation particle concentration scope of relation.
The particle sensor includes in the detection particle concentration pattern of application measuring environment air：In the correlation grain
When the particle concentration value detected in sub- concentration range, and wherein under a kind of operating mode is stablized relatively and meet it
After his default calibration condition, ring is alternately measured using light scattering photometer method and light diffusing particles counting method operating mode
Border air particles concentration is with into line sensor self calibration.
The sensor self calibration comprises the following steps：
The difference for the first and second particle concentration values that signal processing unit detects by comparing is to determine whether perform
Data calibration；
The aptitude data or light scattering grain detected under signal processing unit record light scattering photometer method operating mode
A series of amplitude of the pulses detected under sub-count method operating mode is data to be calibrated with spacing data；
The particle concentration value on the basis of the particle concentration detected under one of which operating mode, signal processing unit is to another
A kind of calibration value of outer operating mode carries out data calibration；
The data calibration includes：Signal processing unit adjusts corresponding with data to be calibrated default in the calibration value
Particle concentration value on the basis of a series of particle concentration value corresponding to aptitude data or the amplitude and spacing data of pulses.
Description of the drawings
Task of explanation is only used for attached drawing described here, and is not intended in any way limit disclosed in the utility model
Scope.In addition, shape, proportional sizes and mutual structure composition of each component in figure etc. is exemplary only, for helping
The understanding to the utility model is helped, is not the specific shape for limiting each component of the utility model, proportional sizes and mutual
Structure composition.Those skilled in the art can select various possible as the case may be under the introduction of the utility model
Shape, proportional sizes and mutual structure composition implement the utility model.
Fig. 1 shows a kind of example arrangement signal of the optical particle sensors of the double working modes of the utility model
Figure.
Fig. 2 shows another example arrangement signal of the optical particle sensors of the double working modes of the utility model
Figure.
Fig. 3 shown in some embodiments of the utility model, the work of the optical particle sensors of double working modes
Flow chart.
Fig. 4 shows that in some embodiments of the utility model the optical particle sensors of double working modes perform mark
Fixed and default work flow diagram.
Specific embodiment
Figures 1 and 2 show that the optical particle sensors of the double working modes in some embodiments of the utility model.
The particle sensor includes：Light sensing module 100, internal light receiving unit 150 sense the standard of 110 transmitting of internal light source unit
Straight detection light 120, which is projected to after particle sensing area 130 caused by KPT Scatter, scatters light 140 and to convert output corresponding
Electric signal；Light source control unit 170 is used to drive and control the working condition of light source unit 110 in light sensing module 100；
And signal processing unit 180, the electric signal for receiving 100 output of light sensing module carry out signal processing and calculate and export inspection
The particle concentration measured.In some embodiments, there are light source unit 110 first lens 111 to be generated with converging with collimated light source
Light.In some embodiments, there are light receiving unit 150 second lens 151 to scatter light 140 to converge.In some embodiments
In, light sensing module 100 also has light trapping 161 with the extra detection light of constantly reflection-absorption.In some embodiments, light passes
Feeling module 100 also has light trapping 162 with the extra scattering light of constantly reflection-absorption.In addition, by specific in element 170,180
The function described herein of one execution can be performed or be distributed in multiple equipment on this sensor.In some embodiments
In, which further includes the electrical control electric fan (not shown) that work is controlled by signal processing unit 180, is used for light
The particle sensing area 130 for sensing module 100 introduces controlled airflow.
Fig. 3 and Fig. 4 shown in some embodiments of the utility model, the optical particle sensors of double working modes
Surrounding air particle concentration detection method.The particle sensor is alternately operated in light scattering photometer method and light diffusing particles meter
Number two kinds of operating modes of method.The first calibration value and light of light scattering photometer method operating mode are stored in signal processing unit 180
Second calibration value of scattering particles counting method operating mode.First calibration value for calibration and default aptitude data and
The correspondence of particle concentration value, second calibration value for calibration and a series of default pulses amplitude and spacing data and
Grain size and the correspondence of particle concentration value.First and second calibration values have each in the range of certain particle concentration
From definite aptitude data and a series of amplitude of pulses and the correspondence of spacing data, i.e. the first and second calibration values
Between there is the correlation particle concentration scope of each definite correspondence.
With reference first to Fig. 3, which first judges whether to perform calibration and be preset after start-up operation.If it does not hold
Rower is fixed and default, then into the light scattering photometer method operating mode under detection particle concentration pattern.Step 1, light source control
Unit 170 sends the pulse signal of predetermined length and frequency to drive and control the light source unit 110 in light sensing module 100
Send pulse detection light.Step 2, signal processing unit 180 senses light sensing module 100 electric signal that granule is exported
Filter and amplification, sampling and digitized processing are performed, forms the aptitude list directly related with sensed KPT Scatter luminous intensity
Place value.In some embodiments, setting of the signal processing unit 180 with 170 pulse signal starting of light source control unit after
Duration samples the electric signal after filter and amplification.In some embodiments, signal processing unit 180 by it includes
Peak detection circuit with based on 170 pulse signal of light source control unit when ordered pair filter and amplification after the electric signal peak
Value is sampled.Step 3, signal processing unit 180 is recorded, analyzed and is calculated detection to aptitude data message
Aptitude data.Step 4, the first calibration value that signal processing unit 180 stores the aptitude data reference of detection.
Step 5, the first particle concentration is detected.Then, whether signal processing unit 180 judges the first particle concentration of detection in default
Correlation particle concentration in the range of, if be not in the range of correlation particle concentration, the first particle for exporting detection is dense
Degree.Then, if the first particle concentration of detection is in the range of correlation particle concentration, judge whether to meet default self-correcting
Floating screed part.If being unsatisfactory for default self calibration condition, the first particle concentration of detection is exported.
If next, meet default self calibration condition, into sensor self calibration.First, in light scattering photometer
The first particle concentration C1 is detected under method operating mode, then, judges whether the detection particle concentration of preset times or period are complete
Into.If the detection of preset times or period do not complete, light scattering photometer method operating mode detection first is continued to execute
Particle concentration C1.If the detection of preset times or period are completed, judge whether the particle concentration C1 of detection stablizes and limiting
Determine in threshold value.If the C1 of detection is unstable, sensor self calibration is exited, returns to detection particle concentration pattern.If detection
C1 stablize, then the particle concentration C1 of the record of signal processing unit 180 detection is stable particle concentration value and record detection C1
Aptitude data are data to be calibrated, meanwhile, into light diffusing particles counting method operating mode.Step 1, light source control unit
170 drive and control the light source unit 110 in light sensing module 100 send continuous detection light with continuous signal.Step 2,
Signal processing unit 180 senses light sensing module 100 a series of series of electrical signals execution filtering caused by particle groups and puts
Greatly, after sampling and digitized processing, a series of pulses directly related with sensed KPT Scatter optical signal are formed.In some realities
It applies in example, signal processing unit 180 carries out continuous sampling with the sample rate of setting to the electric signal after filter and amplification.Step
3, signal processing unit 180 records the amplitude of this series of pulse with spacing (pulse frequency) data message, analyze and
The amplitude and spacing data of a series of pulses of detection is calculated.Step 4, signal processing unit 180 is by a series of of detection
The amplitude of pulse is with spacing data with reference to the second calibration value of storage.Step 5, the second particle concentration C2 is detected.Next, it returns to
Light scattering photometer method operating mode detects the first particle concentration C3.Then, judge that C3 and the stable particle recorded of detection are dense
Whether the difference for spending C1 is being limited in threshold value.If C3 is unstable in C1, sensor self calibration is exited, returns to detection particle
Concentration mode.If C3 stablizes the particle on the basis of C1, the second particle concentration C2 of the record detection of signal processing unit 180
Concentration value.Then, judge whether benchmark particle concentration C2 and the difference of stable particle concentration C 1 are more than restriction threshold value.If C2 with
The difference of C1 is being limited in threshold value, then exits sensor self calibration, returns to detection particle concentration pattern.If the difference of C2 and C1
More than threshold value is limited, then data calibration is performed：Signal processing unit 180 adjusts corresponding with data to be calibrated in the first calibration value
Particle concentration C2 on the basis of particle concentration value corresponding to default aptitude data.After the completion of data calibration, sensor is certainly
Calibration terminates, and returns to detection particle concentration pattern.
The particle sensor is after start-up operation, if performing calibration and presetting, into calibration and preset mode.It connects down
Carry out reference chart 4, calibration when being first carried out detection particle concentration pattern and default.Under light scattering photometer method operating mode,
The first calibration value is demarcated and preset to the particle concentration value that the aptitude data of detection combine reference.Then, judge to detect
Calibration during particle concentration pattern and it is default whether complete, if do not completed, continue to execute light scattering photometer method Working mould
Formula is to demarcate and preset the first calibration value.
Next, if calibration and default completion during detection particle concentration pattern, perform correlation particle concentration
It demarcates and default.First, the first particle concentration CR is detected in light scattering photometer method operating mode, then judges CR whether pre-
If correlation particle concentration in the range of.If CR in the range of default correlation particle concentration, does not continue to execute light and dissipates
It penetrates photometer measuring method operating mode and detects the first particle concentration CR.If CR is in the range of default correlation particle concentration,
The CR of the record detection of signal processing unit 180 is stable particle concentration value.Then, into light diffusing particles counting method Working mould
Formula detects the amplitude and spacing data of a series of pulses, and is recorded as data to be calibrated by signal processing unit 180.Next,
It returns to light scattering photometer method operating mode and detects the first particle concentration CC, then, judge the stabilization grain of the CC and record of detection
Whether the difference of sub- concentration C R is being limited in threshold value.If CC is unstable in CR, restart the work of light scattering photometer method
Pattern detects the first particle concentration CR.If CC stablizes in CR, signal processing unit 180, which corresponds to data to be calibrated, stablizes grain
Sub- concentration C R demarcates and is preset as the second calibration value.Finally, the calibration of correlation particle concentration is judged and presets whether complete, such as
Fruit does not complete, then continues to execute light scattering photometer method operating mode and detect the first particle concentration CR.If correlation particle is dense
The calibration of degree and default completion, then demarcate and preset mode is completed, and returns to the start-up operation state of the particle sensor.
It by reference to Fig. 3 and Fig. 4, shows in some embodiments of the utility model, the optics grain of double working modes
Sub- transducer calibration and default, detection surrounding air particle concentration and the self-alignment method of sensor.Similar, it is new in this practicality
In some embodiments of type, it is defeated which enters light diffusing particles counting method operating mode when detecting particle concentration pattern
Go out the second particle concentration detected, when sensor self calibration is dense with the first particle of light scattering photometer method operating mode detection
Particle concentration value performs data calibration to the second calibration value on the basis of degree；Correspondingly, calibration and when preset mode, first carry out light and dissipate
It penetrates the calibration of the second calibration value under particle counting operating mode and presets, then perform light scattering photometer method operating mode again
The calibration of the first calibration value in the range of lower correlation particle concentration and default.In some of these embodiments,
In light diffusing particles counting method operating mode when detecting particle concentration pattern, signal processing unit 180 is according to a system of detection
The amplitude data of row pulse determines relevant droplet measurement information to a certain extent.Some of these embodiments
In, signal processing unit 180 exports the particle density detected, correspondingly, including a series of default arteries and veins in the second calibration value
The spacing data of punching and the correspondence of particle density value.
Can using can perform on the microprocessor software, custom circuit or a combination thereof perform by signal processing list
The function described herein that member performs.
It will be appreciated by those of ordinary skill in the art that in the situation of the spirit and essential characteristics without departing substantially from the utility model
Under, the utility model can be implemented by other specific forms.Therefore, this description is considered as schematical in all fields
It is rather than restricted.The scope of the utility model indicates by appended claims, and be intended to the meaning of its equivalent and
In scope with all changes be included therein.
Claims (5)
1. a kind of optical particle sensors of double working modes, which is characterized in that including：
Light sensing module, the collimation detection light of internal light receiving unit sensing internal light source unit transmitting are projected to particle sensing
Light is scattered caused by KPT Scatter behind region and converts the corresponding electric signal of output,
Light source control unit is used to drive and control the working condition of light source unit described in the light sensing module,
And signal processing unit, the electric signal for receiving the light sensing module output carry out signal processing and calculate simultaneously
Export the particle concentration detected；
The optical particle sensors of the double working modes are alternately operated in light scattering photometer method and light diffusing particles count
Two kinds of operating modes of method,
During the light scattering photometer method operating mode, the light sensing module senses the electric signal caused by granule
After performing filter and amplification, sampling and digitized processing by the signal processing unit, formed and sensed KPT Scatter luminous intensity
Directly related aptitude unit value, the aptitude information is again via signal processing unit record, analysis and meter
It calculates, the first particle concentration that the first calibration value output then referring to storage detects, first calibration value is the signal
The correspondence of default aptitude data and particle concentration value in processing unit,
During the light diffusing particles counting method operating mode, the light sensing module senses an a series of system caused by particle groups
The electric signal is arranged by after signal processing unit execution filter and amplification, sampling and digitized processing, is formed and sensed grain
A series of directly related pulses of sub- scattered light signal, a series of pulse pulse frequency informations are again via the signal processing
Unit record, analysis and calculating, the second particle concentration that the second calibration value output then referring to storage detects, and certain
Relevant droplet measurement information is determined in degree, second calibration value is a series of default arteries and veins in the signal processing unit
The amplitude of punching and spacing data and grain size and the correspondence of particle concentration value.
2. the optical particle sensors of double working modes according to claim 1, which is characterized in that the particle sensor
It further includes by the electrical control electric fan of signal processing unit control work, is used for the particle sensing area to the light sensing module
Domain introduces controlled airflow.
3. the optical particle sensors of double working modes according to claim 1, which is characterized in that the light scattering luminosity
During meter method operating mode, the light source control unit drives and controls the light pass with predetermined length and the pulse signal of frequency
The light source unit in sense module sends pulse detection light, and the signal processing unit is believed with the light source control unit pulse
Number start along after setting duration the electric signal after filter and amplification is sampled.
4. the optical particle sensors of double working modes according to claim 1, which is characterized in that the light scattering luminosity
During meter method operating mode, the light source control unit drives and controls the light pass with predetermined length and the pulse signal of frequency
The light source unit in sense module sends pulse detection light, the signal processing unit by it includes peak detection circuit
With based on the light source control unit pulse signal when ordered pair filter and amplification after the peak value of the electric signal sampled.
5. the optical particle sensors of double working modes according to claim 1, which is characterized in that the light diffusing particles
During counting method operating mode, the light source control unit is with continuous signal come described in driving and control in the light sensing module
Light source unit sends continuous detection light, and the signal processing unit is with the sample rate that sets to the telecommunications after filter and amplification
Number carry out continuous sampling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721409215.4U CN207457013U (en) | 2017-10-28 | 2017-10-28 | A kind of optical particle sensors of double working modes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721409215.4U CN207457013U (en) | 2017-10-28 | 2017-10-28 | A kind of optical particle sensors of double working modes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207457013U true CN207457013U (en) | 2018-06-05 |
Family
ID=62282035
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721409215.4U Active CN207457013U (en) | 2017-10-28 | 2017-10-28 | A kind of optical particle sensors of double working modes |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207457013U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115290518A (en) * | 2022-10-10 | 2022-11-04 | 张家港谱析传感科技有限公司 | Take particle size spectrometer of self calibration |
-
2017
- 2017-10-28 CN CN201721409215.4U patent/CN207457013U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115290518A (en) * | 2022-10-10 | 2022-11-04 | 张家港谱析传感科技有限公司 | Take particle size spectrometer of self calibration |
| CN115290518B (en) * | 2022-10-10 | 2022-12-30 | 张家港谱析传感科技有限公司 | Take particle size spectrometer of self calibration |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10481070B2 (en) | Systems, devices, and methods for flow control and sample monitoring control | |
| Manikonda et al. | Laboratory assessment of low-cost PM monitors | |
| US8009290B2 (en) | Compact, low cost particle sensor | |
| CN107655803A (en) | The particle sensor and its detection method of a kind of double working modes | |
| US7053783B2 (en) | Pathogen detector system and method | |
| AU2002367966B2 (en) | System and method for detecting and classifying biological particles | |
| US8218144B2 (en) | Pathogen and particle detector system and method | |
| US10876949B2 (en) | Flow device and associated method and system | |
| US7835000B2 (en) | System and method for measuring particles in a sample stream of a flow cytometer or the like | |
| US8717550B2 (en) | Method and device for detecting biological material | |
| US7130046B2 (en) | Data frame selection for cytometer analysis | |
| US9581494B2 (en) | Method and device for analyzing small particles in gas | |
| US11073467B2 (en) | Miniaturized optical particle detector | |
| US20220018754A1 (en) | Multimodal dust sensor | |
| KR20200058318A (en) | Multimodal dust sensor | |
| CN207457013U (en) | A kind of optical particle sensors of double working modes | |
| JPH08159949A (en) | Particle detection device | |
| CN108120659A (en) | A kind of particle concentration detecting system and method having from zero calibration | |
| US20230117469A1 (en) | Particulate detection, counting, and identification | |
| CN110346253A (en) | A kind of method for self-calibrating of particle concentration detection system | |
| CN207472723U (en) | A kind of particle concentration detecting system having from zero calibration | |
| CN109520899A (en) | A kind of air particle concentration detection method and device | |
| JPH0743299A (en) | Micropowder particle monitor | |
| EP3543678A1 (en) | Particle sensor and method | |
| RU2504753C1 (en) | Photoelectric method of determining size and concentration of suspended particles |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |