CN107314958B - Laser dust concentration measuring device with self-calibration device and method - Google Patents
Laser dust concentration measuring device with self-calibration device and method Download PDFInfo
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- CN107314958B CN107314958B CN201710409044.3A CN201710409044A CN107314958B CN 107314958 B CN107314958 B CN 107314958B CN 201710409044 A CN201710409044 A CN 201710409044A CN 107314958 B CN107314958 B CN 107314958B
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- 239000000428 dust Substances 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 10
- 238000001514 detection method Methods 0.000 claims abstract description 23
- 239000002245 particle Substances 0.000 claims abstract description 14
- 238000005259 measurement Methods 0.000 claims description 8
- 230000001788 irregular Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 4
- 230000003287 optical effect Effects 0.000 description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000000149 argon plasma sintering Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000013618 particulate matter Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
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
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- G01N15/075—
Abstract
The invention discloses a laser dust concentration measuring device with a self-calibration device, which comprises a laser, a detection cavity and a scattered light receiver positioned in the detection cavity. The specific method comprises the following steps: a. performing first calibration, and storing the signal intensity E3 received by the receiver as a reference light intensity calibrated later; b. after the detection device is used for a period of time, the shielding mechanism can be opened at regular or irregular time to calibrate the sensor, and the signal intensity E4 received by the receiver at the moment makes E4/E3=eta; c. when the shielding mechanism is reset and then starts to measure, the light intensity of scattered light generated when particles with the diameter of D pass through the laser beam and received by the receiver is E5; the signal processing component takes E5/η as the actual light intensity received when processing E5. The laser dust concentration measuring device with the self-calibration device has high detection precision.
Description
Technical Field
The invention belongs to the field of automobile accessories, and particularly relates to a laser dust concentration measuring device with a self-calibration device and a method thereof.
Background
In the use process of the existing laser dust sensor, dust contained in the measured air can gradually accumulate on the outer surface of an outgoing mirror of a laser tube (the surface which can be in direct contact with the measured air) and the outer surface of a silicon light pipe serving as a scattering light receiver along with the increase of the working time of equipment, and the accumulated dust can shield scattered light signals of the outgoing laser and the receiving tube, so that a measured value deviates from a true value, deviation of a measured result can be caused, and the equipment applying the measured values is guided by error data to make error actions due to the large deviation of the measured result.
The existing laser dust sensor mainly comprises a built-in laser, a photoelectric receiving device, a micro fan and a signal processing component, wherein a light scattering principle is adopted, a laser beam emitted by the laser passes through a measuring cavity, the micro fan works to generate flowing gas, when the gas passes through the measuring cavity where the laser beam is located, the laser light scatters on particles contained in the measured gas, scattered light is converted into an electric signal by the photoelectric receiving device, and then PM2.5 mass concentration, PM10 mass concentration, PM 0.3-PM 2.5 particle number and PM 2.5-PM 10 particle number are calculated through the signal processing component according to a specific algorithm.
As shown in fig. 1 and 2, in the conventional laser dust sensor, during use, since dust particles in the measured gas inevitably have a part adsorbed or precipitated on the outer surface of the exit mirror of the laser 1 (which means the side that can be in direct contact with the measured air) and the surface outside the silicon light pipe as a scattering light receiver, since the measuring cavity of the laser dust sensor is generally sealed, these adsorbed or precipitated particles cannot be cleaned without disassembling the measuring cavity (especially when the sensor is installed in an air cleaner or an automobile). These adsorbed or precipitated dust can cause two problems:
1. the emitted light of the laser is shielded by dust, so that the intensity of the emitted light is reduced;
2. scattered light is blocked by dust on the surface of a silicon light pipe as a receiver, resulting in a decrease in the intensity of an actually received optical signal.
The existing laser dust sensor generally calibrates the emergent light intensity E0 of the laser and the scattered light intensity received by the receiver when the surfaces of the laser and the receiving device are not polluted in the manufacturing process of the product, and the initial value E0 can be used as a reference for measurement in the subsequent use process. For example, when the surfaces of the laser and the receiving device are not polluted, the emergent light intensity of the laser is E0, and the light intensity of scattered light generated when particles with the diameter D pass through the laser beam is E1; when the surfaces of the laser and the receiving device are polluted, the light intensity of scattered light generated when particles with the diameter D pass through the laser beam is E2, and the measurement result calculated by the same calculation method is lower than the actual value because E2 is smaller than E1. This deviation increases as the sensor lifetime increases, particulate matter adsorbs or precipitates more and more.
As a laser dust sensor for measuring the mass concentration of dust or the number of particles, it is required for the accuracy of measurement, so that when the laser dust sensor is used for a certain period of time, as the use time increases, the particles are adsorbed or precipitated more and more, the deviation thereof becomes larger and larger, so that the measurement result is meaningless, or the electric appliance applying the measurement result is guided by erroneous data, and an erroneous operation action is made.
Disclosure of Invention
First, the technical problem to be solved
The invention aims to solve the technical problem of improving the accuracy of the laser dust sensor during the whole use period.
(II) technical scheme
In order to solve the technical problems, the invention adopts the following technical scheme: the invention further comprises a light source transmitter, wherein the laser is used for transmitting laser beams, and part or all of the laser beams are irradiated on the receiving surface of the scattered light receiver through the light source transmitter.
In the laser dust concentration measuring device with the self-calibration device, the light source transmitter is arranged at the rear side of the detection cavity.
In the laser dust concentration measuring device with the self-calibration device, part or all of the light source transmitter is arranged at the inner side of the detection cavity.
In the laser dust concentration measuring device with the self-calibration device, the light source transmitter is in a reflecting mirror or a refracting mirror.
The laser dust concentration measuring device with the self-calibration device further comprises a shielding mechanism for shielding the light source transmitter, and the laser beam cannot be transmitted to the light source transmitter through the shielding mechanism.
The laser dust concentration measuring device with the self-calibration device further comprises a movable platform, and the movable platform controls the shielding mechanism to move so as to shield the light source transmitter.
In the laser dust concentration measuring device with the self-calibration device, the shielding mechanism is a baffle plate.
A laser dust concentration measuring and detecting method with a self-calibration device comprises the following steps:
a. performing first calibration, and storing the signal intensity E3 received by the scattered light receiver as a reference light intensity calibrated later;
b. after the measuring device is used for a period of time, the shielding mechanism can be opened at regular or irregular time to calibrate the scattered light receiver, and the signal intensity E4 received by the scattered light receiver at the moment makes E4/E3=eta;
c. when the shielding mechanism is reset and then starts to measure, scattered light generated when particles with the diameter of D pass through the laser beam is received by the scattered light receiver, and the light intensity is E5; the signal processing component takes E5/η as the actual light intensity received when processing E5.
(III) beneficial effects
The laser dust concentration measuring device with the self-calibration device is characterized in that the light source transmitter is used for reflecting light beams, the light source transmitter is provided with the baffle which can be removed, the surface of the light source transmitter can be prevented from being polluted when the baffle is not removed, and after the baffle is removed, the light source transmitter can reflect part or all of the light beams to the receiving surface of the receiver, and the measurement standard of the sensor is calibrated, so that the detection is very accurate.
Drawings
FIG. 1 is a schematic block diagram of a prior art laser dust sensor;
FIG. 2 is a schematic diagram of a prior art laser dust sensor;
FIG. 3 is a diagram of a first embodiment of a laser dust concentration measuring device with self-calibration device according to the present invention;
FIG. 4 is a schematic view of the light source transmitter and shielding mechanism of FIG. 3;
FIG. 5 is a top view of FIG. 3;
FIG. 6 is a diagram of a second embodiment of a laser dust concentration measuring device with self-calibration device of the present invention;
in the figure, a laser is 1, a detection cavity is 2, a scattered light receiver is 3, a light source transmitter is 4, a laser beam is 5, a shielding mechanism is 6, dust particles are 8, and a receiving surface is 9.
Detailed Description
The following describes in further detail the embodiments of the present invention with reference to the drawings and examples. The following examples are illustrative of the invention and are not intended to limit the scope of the invention.
Embodiment one: as shown in fig. 3-5, the laser dust concentration measuring device with the self-calibration device comprises a laser 1, a light source transmitter 4, a detection cavity 2 and a scattered light receiver 3 positioned in the detection cavity 2, wherein the light source transmitter 4 is arranged at the rear side of the detection cavity 2. The laser 1 is used to emit a laser beam 5, part or all of the laser beam 5 being irradiated by a light source transmitter 4 onto a receiving surface 9 of the scattered light receiver 3.
Part or all of the light source transmitter 4 is arranged inside the detection cavity 2.
Specifically, the light source transmitter 4 is a reflective mirror or a refractive mirror, and may be a device for transmitting other light sources. The mirrors may be replaced by a set of mirrors, or the mirrors may be replaced by one or a set of refractive optical elements. As long as the effect of allowing part or all of the reflected light beam to strike the receiving surface of the receiver can be achieved.
The light source transmitter 4 may also be replaced by other optical elements or an assembly of several optical elements. As long as the effect of allowing part or all of the reflected light beam 5 to strike the receiving surface of the receiver can be achieved.
The invention also comprises a shielding mechanism 6 for shielding the light source transmitter 4, wherein the laser beam can not be transmitted to the light source transmitter 4 through the shielding mechanism, the specific structure of the shielding mechanism 6 is a baffle, and the shielding mechanism is provided with a movable platform which is composed of an electromagnetic driving motor or an electric driving motor and the like, and the mechanism is enabled to act by an instruction sent by a sensor built-in chip or an instruction sent by an external component through a signal wire of the sensor, so that the shielding mechanism can be controlled automatically to shield the light source transmitter 4 conveniently.
The structure comprises the following steps when the movement is detected:
a. performing first calibration, and storing the signal intensity E3 received by the scattered light receiver 3 as a reference light intensity calibrated later;
b. after the measuring device is used for a period of time, the shielding mechanism can be opened regularly or irregularly to calibrate the scattered light receiver 3, and the intensity E4 of a signal received by the scattered light receiver 3 is enabled to enable E4/E3=eta at the moment;
c. when the shielding mechanism is reset and then starts to measure, scattered light generated when dust particles 8 with the diameter D pass through the laser beam is received by the scattered light receiver 3, and the light intensity is E5; the signal processing component takes E5/η as the actual light intensity received when processing E5.
Therefore, the measurement deviation caused by dust precipitation after long-time use is corrected, and the detection is very accurate.
Embodiment two: the present embodiment is basically the same as the first embodiment, except that part or all of the light source transmitter 4 is disposed inside the detection chamber 2.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that it will be apparent to those skilled in the art that several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the scope of the invention.
Claims (6)
1. The detection method of the laser dust concentration measurement device with the self-calibration device comprises a laser (1), a detection cavity (2), a scattering light receiver (3) positioned in the detection cavity (2), a light source transmitter (4) and a shielding mechanism (6) for shielding the light source transmitter (4), wherein the laser (1) is used for emitting a laser beam (5), part or all of the laser beam (5) irradiates on a receiving surface of the scattering light receiver (3) through the light source transmitter (4), and the laser beam cannot be transmitted to the light source transmitter (4) through the shielding mechanism;
the detection method is characterized by comprising the following steps of:
a. performing first calibration, wherein the signal intensity E3 received by the scattered light receiver (3) is stored as a reference light intensity for later calibration;
b. after the measuring device is used for a period of time, a shielding mechanism (6) is opened regularly or irregularly to calibrate the scattered light receiver (3), and the intensity E4 of a signal received by the scattered light receiver (3) is enabled to enable E4/E3=eta at the moment;
c. when the shielding mechanism (6) is reset and then starts to measure, scattered light generated when particles with the diameter of D pass through the laser beam is received by the scattered light receiver (3), and the light intensity is E5; the signal processing component takes E5/η as the actual light intensity received when processing E5.
2. The detection method of the laser dust concentration measuring device with the self-calibration device according to claim 1, wherein the light source transmitter (4) is arranged at the rear side of the detection cavity (2).
3. The detection method of the laser dust concentration measuring device with the self-calibration device according to claim 1, wherein part or all of the light source transmitter (4) is arranged inside the detection cavity (2).
4. A method of detection of a laser dust concentration measuring device with self-calibration means according to any one of claims 1-3, characterized in that the light source transmitter (4) is structured as a mirror or a refractive mirror.
5. The method of detecting a laser dust concentration measuring device with self-calibration device according to claim 1, characterized in that the laser dust concentration measuring device further comprises a movable stage controlling the movement of the shielding mechanism (6) to shield the light source transmitter (4).
6. The method for detecting the laser dust concentration measuring device with the self-calibration device according to claim 1, wherein the shielding mechanism (6) is a baffle plate.
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| CN201710409044.3A CN107314958B (en) | 2017-06-02 | 2017-06-02 | Laser dust concentration measuring device with self-calibration device and method |
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| CN201710409044.3A CN107314958B (en) | 2017-06-02 | 2017-06-02 | Laser dust concentration measuring device with self-calibration device and method |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108362616B (en) * | 2018-02-08 | 2020-12-22 | 芜湖美智空调设备有限公司 | Dust sensor, calibration method thereof and air treatment equipment |
| CN110082269A (en) * | 2019-04-28 | 2019-08-02 | 宁波爱立德汽车部件有限公司 | A kind of dust concentration and gas concentration lwevel detect measuring device |
| CN110243742A (en) * | 2019-07-29 | 2019-09-17 | 上海和璞电子技术有限公司 | A kind of device and method of engine air filter rear end powder concentration measurement |
| CN111220576A (en) * | 2020-01-17 | 2020-06-02 | 中煤科工集团重庆研究院有限公司 | Laser self-checking type dust concentration detection device and self-checking method thereof |
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