KR20170071319A - Adjustable sensitivity optical dust sensor and method fot adjustable sensitivity - Google Patents
Adjustable sensitivity optical dust sensor and method fot adjustable sensitivity Download PDFInfo
- Publication number
- KR20170071319A KR20170071319A KR1020150179518A KR20150179518A KR20170071319A KR 20170071319 A KR20170071319 A KR 20170071319A KR 1020150179518 A KR1020150179518 A KR 1020150179518A KR 20150179518 A KR20150179518 A KR 20150179518A KR 20170071319 A KR20170071319 A KR 20170071319A
- Authority
- KR
- South Korea
- Prior art keywords
- current
- sensitivity
- signal
- dust
- sensor
- Prior art date
Links
- 239000000428 dust Substances 0.000 title claims abstract description 76
- 230000035945 sensitivity Effects 0.000 title claims abstract description 68
- 230000003287 optical effect Effects 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000001514 detection method Methods 0.000 claims description 10
- 230000003321 amplification Effects 0.000 claims description 3
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 2
- 230000005856 abnormality Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000009434 installation Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/06—Investigating concentration of particle suspensions
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/47—Scattering, i.e. diffuse reflection
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/47—Scattering, i.e. diffuse reflection
- G01N21/49—Scattering, i.e. diffuse reflection within a body or fluid
-
- G01N2015/0693—
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2201/00—Features of devices classified in G01N21/00
- G01N2201/12—Circuits of general importance; Signal processing
- G01N2201/124—Sensitivity
- G01N2201/1241—Multirange
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2201/00—Features of devices classified in G01N21/00
- G01N2201/12—Circuits of general importance; Signal processing
- G01N2201/125—Digital circuitry
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2201/00—Features of devices classified in G01N21/00
- G01N2201/12—Circuits of general importance; Signal processing
- G01N2201/126—Microprocessor processing
Landscapes
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Dispersion Chemistry (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The present invention relates to a method for varying sensitivity of an optical dust sensor and an optical dust sensor capable of varying the sensitivity of each concentration by concentration and includes a current supply unit 20 for supplying a current set to the light source unit 30, A light receiving sensor 40 for receiving the scattered light scattered by the dust and outputting an analog signal corresponding thereto, an amplifier 50 for amplifying and outputting the analog signal of the light receiving sensor 40, An analog-to-digital converter 60 for converting an output signal of the amplifier 50 into a digital signal; an analog / digital converter 60 for receiving an output signal of the analog / digital converter 60 and outputting a PLO (Loop Occupancy, A microcomputer 10 for controlling the current supply unit 20 to increase the driving current in a stepwise manner by checking whether the sensitivity of the currently detected dust concentration is equal to or higher than the reference sensitivity, One 0), and a sensor output unit 70 for outputting an output signal according to the dust concentration.
Description
[0001] The present invention relates to an optical dust sensor and a method for varying the sensitivity of an optical sensor capable of varying sensitivity by density, and more particularly, The present invention relates to an optical dust sensor and a variable sensitivity detection method for each concentration.
In general, the optical dust sensor has a structure for irradiating light of a light source to a region to be dust-detected and detecting the amount of light scattered by the dust at the light-receiving portion to determine the dust concentration.
Such an optical dust sensor can be applied to electronic devices such as air conditioners and air purifiers, and it can also be installed in an automobile to detect indoor dust concentration. Also, it can be applied to an indoor space in which a dust concentration such as a clean room must be managed.
Such an optical dust sensor is disclosed in Japanese Patent Application Laid-Open No. 10-2015-0113575 (MCU type dust sensor, published October 8, 2015). The dust sensor described in the above patent includes a light emitting portion for generating light, a condensing lens for condensing the light scattered by floating dust, a light receiving portion for detecting the condensed light, an amplifying portion for amplifying the light receiving portion signal of the light receiving portion, And an MCU for receiving a signal amplified by the amplifying unit and outputting a pulse width modulation signal, wherein the MCU includes a reference signal generator for performing a function of generating a reference signal, .
However, the reference voltage can be determined by knowing the output value of the initial pollution concentration of the sensor. However, there is a problem that the reference voltage can not be applied without the comparative reference measuring device.
In addition, prior to the above-mentioned Japanese Patent Laid-Open No. 10-2015-0113575, the patent application No. 10-0539310 (registered trademark of Optical Dust Sensor having a self-sensitivity correction function and sensitivity deviation control function, registered on December 21, 2005) A technology for adjusting the sensitivity and controlling the sensitivity deviation using a microcomputer is disclosed.
When there is a reason that the intensity of light entering the light receiving sensor for detecting scattered light changes, that is, when the intensity of the LED light is fluctuating or the lens is contaminated and the sensitivity is lowered, .
However, the conventional techniques can not be applied equally to a single product having a large concentration variation of dust, and it is necessary to detect the average dust concentration in the application field in advance and set the product with a sensitivity matching the dust concentration Therefore, it is necessary to sufficiently calibrate the sensitivity to be applied to a new field. Therefore, it is not easy to apply to a new field, and there is a problem that it takes much time.
If the sensitivity of dust concentration detection is set high in an environment where the concentration of dust is 3,000,000 / ft 3 with a single product, if the product is used in an environment with a concentration of 1,000 pieces / ft 3 , There is a problem that it is necessary to set the sensitivity depending on the concentration because it is difficult to accurately detect the concentration.
According to an aspect of the present invention, there is provided an optical dust sensor which can automatically determine a dust concentration range in an installed environment, And a method for varying the star detection sensitivity.
The present invention also provides an optical dust sensor capable of diagnosing an abnormality of the sensor itself and varying the sensitivity according to the concentration that can notify the abnormality when the abnormality is diagnosed, and a method of varying the sensitivity of detection by concentration.
According to an aspect of the present invention, there is provided an optical dust sensor capable of varying the sensitivity according to the concentration of the present invention. The optical dust sensor includes a current supply unit supplying current to the light source unit, An
The
The
The
The
The failure signal is an LPO signal, which is 0.001 to 0.1 times the
The method for varying the detection sensitivity of each optical density sensor according to the present invention includes the steps of: a) supplying a set minimum driving current (i 0 ) to the
The method may further include generating a fault signal if the maximum driving current is determined as a result of step e).
The failure signal may be 0.001 to 0.1 times the normal sensor output signal.
The optical dust sensor and the method for varying the sensitivity of the concentration according to the present invention are capable of varying the sensitivity according to the concentration of the present invention. In this method, the driving current for driving the light source is gradually increased from a low value to a high value, Is output above the reference sensitivity, it is possible to automatically set the most suitable sensitivity in the currently installed dust concentration environment.
Therefore, there is an effect that it is possible to reduce the inconvenience of setting the sensitivity in advance in consideration of the field to be applied in production of the product.
Further, according to the present invention, even if dusts are not detected even after sequentially inputting from the set minimum drive current to the maximum drive current, it is possible to diagnose and inform the user of abnormality, There is an effect that it is easy to check whether it is in the wiring.
1 is a block diagram of an optical dust sensor capable of varying sensitivity according to a preferred embodiment of the present invention.
2 is a graph for explaining the operation of the present invention.
Fig. 3 is a configuration diagram of the current supply unit in Fig. 1. Fig.
4 is a flowchart of a method for varying detection sensitivity by concentration according to a preferred embodiment of the present invention.
An optical dust sensor capable of varying the sensitivity according to the concentration of the present invention and a method for varying the sensitivity of detection according to concentration will be described in detail with reference to the accompanying drawings.
1 is a block diagram of an optical dust sensor capable of varying sensitivity according to a preferred embodiment of the present invention.
Referring to FIG. 1, an optical dust sensor capable of varying sensitivity according to a preferred embodiment of the present invention includes a
Hereinafter, the construction and operation of the optical dust sensor capable of varying the sensitivity according to the concentration according to the preferred embodiment of the present invention will be described in detail.
FIG. 2 is a graph for explaining the operation of the present invention, and shows an output value with respect to a dust concentration according to a difference in driving current.
When the driving current is minimum i 0 , the range of detectable dust concentration becomes large. However, when the driving current is below a certain dust concentration, the output value is low and the slope is gentle and the desired sensitivity can not be obtained.
Also, when the driving current is i 1 , which is the medium value, the range of detectable dust concentration is narrower than i 0 , but it can be confirmed that it is appropriate at the portion of 100,000 ft 3 .
In Fig. 2, the density of dust / ft 3 is used, but mg / ft 3 can be used.
In the case of i 2 , which is the maximum value of the driving current, the detectable dust concentration range is very narrow, but it can be confirmed that the sensitivity is relatively good in the low concentration range.
The dust concentration detection area is divided according to the value of the driving current. In the present invention, the sensitivity can be automatically changed by selecting a driving current most suitable for the current installation environment.
Specifically, in the initial state, the
The
The
The high signal and the low signal at the output of the A /
At this time, the LPO value is substituted into FIG. 2 to calculate the dust concentration, and the dust concentration is calculated considering that the currently detected LPO is the result of supplying the driving current (i 0 ) to the
When judged that the above is not suitable for the supply of the driving current (i 0), the
3 is a diagram showing an embodiment of the
The specific configuration of the
The
The light amount of the
The
It is judged that the present LPO is appropriate when the current LPO when the driving current i 1 is supplied is larger than the reference sensitivity (or the reference output) in the table of FIG. 2, and it is judged that it is not suitable if it is less than the reference sensitivity (or reference output).
At this time, if it is judged to be appropriate, the driving current i 1 is supplied to the
That is, in FIG. 3, the driving current i 1 supplied through the
The amount of light of the
The
In this case, even when the drive current (i 2 ) having the largest current value is supplied as the drive current, the
The failure signal is a signal of the LPO that is distinctly distinguished from the normal output of the
This difference corresponds to about 100 dust particles.
Since the abnormality of the optical dust sensor itself can be easily confirmed from the outside according to the generation of the failure signal, the maintenance becomes easy.
In the above description, whether or not the failure signal is generated is described based on the set maximum driving current (i 2 ). However, a separate criterion can be added in order to check the failure.
4 is a flowchart of a method for varying detection sensitivity by concentration according to a preferred embodiment of the present invention.
1 and 3 described above, the method of varying the sensitivity of each concentration according to the present invention includes the steps of: (S10) supplying a set minimum driving current (i 0 ) to the
Such a process is a process of automatically setting the driving current or optical output most suitable for detecting the dust concentration of the present installation environment while gradually increasing the value of the driving current. Since the specific operation has been described above in detail, It is omitted.
It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention will be.
10: Microcomputer 20: Current supply unit
30: Light source part 40: Light receiving sensor
50: amplification unit 60: analog / digital conversion unit
70: Sensor output section
Claims (9)
A light receiving sensor 40 for receiving scattered light scattered by dust emitted from the light source 30 and outputting an analog signal corresponding to the scattered light,
An amplification unit 50 for amplifying and outputting the analog signal of the light receiving sensor 40,
An analog / digital converter 60 for converting an output signal of the amplifier 50 into a digital signal,
The output signal of the A / D converter 60 is received to calculate the LPO (Lo Pulse Occupancy, duration of the low signal) to determine whether the sensitivity of the currently detected dust concentration is equal to or greater than the reference sensitivity, A microcomputer 10 for controlling the current supply unit 20 to gradually increase the driving current,
And a sensor output unit (70) for outputting an output signal according to the dust concentration calculated by the microcomputer (10).
The microcomputer (10)
Wherein the control unit controls so as to supply the driving current in a stepwise manner from the set minimum driving current to the maximum driving current.
The current supply unit 20,
Wherein the driving current is supplied to the light source part (30) with different current values flowing in each current path, including a plurality of current paths.
The current supply unit 20,
Wherein a sum of currents flowing through each current path including a plurality of current paths is supplied to the light source unit (30) as a driving current.
When the sensitivity to the currently detected dust concentration is less than the reference sensitivity even in the state in which the drive current of the maximum value is supplied,
Wherein the microcomputer (10) outputs a failure signal through the sensor output unit (70).
Wherein the failure signal is an LPO signal and is 0.001 to 0.1 times the normal output signal LPO of the sensor output section 70 so as to be distinguishable from the normal output signal of the sensor output section 70. [ The optical dust sensor can be varied.
b) processing the output signal of the light-receiving unit 30, which has received scattered light scattered by the dust of the light source unit 30, and calculating the LPO in the microcomputer 10;
c) checking whether the current LPO is equal to or higher than the reference sensitivity in the LPO graph of the dust concentration according to the supply of the driving current (i 0 );
d) maintaining a current drive current (i 0) is the c) step of the determination result over the sensitivity, the current standard LPO;
e) determining whether the c) if the determination result of the step is less than the current reference sensitivity LPO maximum drive current, the current drive current (i 0) is set; And
f) supplying a driving current (i 1 ) having a current value one step higher than the maximum driving current to the light source unit (30) as a result of the determination in the step (e), and returning to the step b) Of the detection sensitivity of the optical dust sensor according to the concentration.
Further comprising the step of generating a failure signal if the maximum driving current is determined as a result of step e).
The fault signal may be,
Wherein the sensor output signal is 0.001 to 0.1 times the normal sensor output signal.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020150179518A KR101755368B1 (en) | 2015-12-15 | 2015-12-15 | Adjustable sensitivity optical dust sensor and method fot adjustable sensitivity |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020150179518A KR101755368B1 (en) | 2015-12-15 | 2015-12-15 | Adjustable sensitivity optical dust sensor and method fot adjustable sensitivity |
Publications (2)
Publication Number | Publication Date |
---|---|
KR20170071319A true KR20170071319A (en) | 2017-06-23 |
KR101755368B1 KR101755368B1 (en) | 2017-07-10 |
Family
ID=59283463
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
KR1020150179518A KR101755368B1 (en) | 2015-12-15 | 2015-12-15 | Adjustable sensitivity optical dust sensor and method fot adjustable sensitivity |
Country Status (1)
Country | Link |
---|---|
KR (1) | KR101755368B1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20190000995A (en) * | 2017-06-26 | 2019-01-04 | 엘지전자 주식회사 | Dust detecting device and method for controlling the same |
KR20190065874A (en) * | 2017-12-04 | 2019-06-12 | (주) 테크로스 | Method for measuring of total residual oxidant having light-source calibrating function |
KR102225665B1 (en) * | 2019-10-10 | 2021-03-10 | 국방과학연구소 | A Method for Detecting Biological Particles |
KR20230055857A (en) * | 2021-10-19 | 2023-04-26 | 관악아날로그 주식회사 | Dust sensor |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108956892A (en) * | 2018-08-06 | 2018-12-07 | 佛山市甜慕链客科技有限公司 | The device and method of air in a kind of monitoring building |
-
2015
- 2015-12-15 KR KR1020150179518A patent/KR101755368B1/en active IP Right Grant
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20190000995A (en) * | 2017-06-26 | 2019-01-04 | 엘지전자 주식회사 | Dust detecting device and method for controlling the same |
KR20190065874A (en) * | 2017-12-04 | 2019-06-12 | (주) 테크로스 | Method for measuring of total residual oxidant having light-source calibrating function |
KR102225665B1 (en) * | 2019-10-10 | 2021-03-10 | 국방과학연구소 | A Method for Detecting Biological Particles |
KR20230055857A (en) * | 2021-10-19 | 2023-04-26 | 관악아날로그 주식회사 | Dust sensor |
Also Published As
Publication number | Publication date |
---|---|
KR101755368B1 (en) | 2017-07-10 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
KR101755368B1 (en) | Adjustable sensitivity optical dust sensor and method fot adjustable sensitivity | |
AU2004314376B2 (en) | Method for evaluation of a scattered light signal and scattered light detector used for carrying out said method | |
JP4773411B2 (en) | Current detection circuit and current detection method | |
JP2012517073A5 (en) | ||
JP4268308B2 (en) | Photoelectric switch | |
AU2009352856A1 (en) | Smoke sensor | |
KR100539310B1 (en) | The optical dust sensor which has a function of self diagonosis and the sensitivity control | |
WO2008043672A3 (en) | Method for controlling a power state of an x-ray emitter and/or an x-ray detector, and system for carrying out said method | |
CN110779851A (en) | Method and device for monitoring optical output power and particle sensor device | |
JP5335638B2 (en) | Smoke detector and fire alarm | |
DE60040832D1 (en) | Object sensor and its application in a windshield wiper control circuit | |
KR101600047B1 (en) | Optical dust sensor capable of controlling amount of light and having multiple light emitting units | |
KR20160122024A (en) | Fine particulate matter sensor for automotive application | |
KR101069027B1 (en) | Device and method of wire down detection for gas detection sensor | |
JP4817368B2 (en) | Fire detector | |
KR102361512B1 (en) | An address type fire detection device that generates AC current with multiple frequency components AND a fire detection system including the same | |
KR102361499B1 (en) | An address type fire detection device using the amplitude spectrum of the alternating current AND a fire detection system including the same | |
JP4737612B2 (en) | Encoder | |
JP4599188B2 (en) | Radiation detector | |
US20200030732A1 (en) | Device and method for detecting filter clogging | |
KR101971732B1 (en) | Optical dust sensor | |
JP5416391B2 (en) | smoke detector | |
JP2009239032A (en) | Laser diode driving circuit and laser welding power source | |
EP3526590A1 (en) | A fluorescence sensing system | |
KR101876553B1 (en) | Apparatus and method for controlling ouput of lighting source in system for measuring partial pressure of respiratory gas |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
A201 | Request for examination | ||
E902 | Notification of reason for refusal | ||
E701 | Decision to grant or registration of patent right | ||
GRNT | Written decision to grant |