CN111220577A - Gas circuit protection type laser dust concentration detection device and self-detection method thereof - Google Patents
Gas circuit protection type laser dust concentration detection device and self-detection method thereof Download PDFInfo
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- CN111220577A CN111220577A CN202010055445.5A CN202010055445A CN111220577A CN 111220577 A CN111220577 A CN 111220577A CN 202010055445 A CN202010055445 A CN 202010055445A CN 111220577 A CN111220577 A CN 111220577A
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- 238000001514 detection method Methods 0.000 title claims abstract description 125
- 239000000428 dust Substances 0.000 title claims abstract description 96
- 108091008695 photoreceptors Proteins 0.000 claims abstract description 65
- 238000000034 method Methods 0.000 claims abstract description 12
- 238000005192 partition Methods 0.000 claims 1
- 238000004140 cleaning Methods 0.000 abstract description 2
- 239000003245 coal Substances 0.000 abstract description 2
- 238000005065 mining Methods 0.000 abstract description 2
- 239000002245 particle Substances 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 26
- 238000010586 diagram Methods 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 239000012530 fluid Substances 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000013618 particulate matter Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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- 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
- G01N21/53—Scattering, i.e. diffuse reflection within a body or fluid within a flowing fluid, e.g. smoke
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- G—PHYSICS
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- 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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- 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
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
- G01N21/15—Preventing contamination of the components of the optical system or obstruction of the light path
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- 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
- G01N15/075—Investigating concentration of particle suspensions by optical means
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- 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
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
- G01N21/15—Preventing contamination of the components of the optical system or obstruction of the light path
- G01N2021/155—Monitoring cleanness of window, lens, or other parts
- G01N2021/157—Monitoring by optical means
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Abstract
The invention relates to the technical field of laser detection, particle detection, dust detection or coal mining, in particular to a self-checking method of a gas path protection type laser dust concentration detection device, which comprises a main laser generator, a laser receiver, a scattering photoreceptor and a body, wherein emergent laser of the main laser generator penetrates through an emission chamber and a main light hole and then enters into a detection chamber, part of laser penetrates through the light of the detection chamber and reaches the laser receiver, part of laser penetrates through dust scattering in the detection chamber and reaches the scattering photoreceptor, a pipe orifice of a first air inlet pipe is not aligned with the main light hole, the first air inlet pipe is arranged so that dust-free air flow can be introduced into the first air inlet pipe so that the air flow flows from the emission chamber to the detection chamber, under the driving of the air flow, the dust amount escaping from the detection chamber to the emission chamber can be greatly reduced, and the frequency of a laser light path from the main laser generator to the, therefore, the frequency of disassembling the gas circuit protection type laser dust concentration detection device for cleaning can be greatly reduced.
Description
Technical Field
The invention relates to the technical field of laser detection, particulate matter detection, dust detection or coal mining, in particular to a gas circuit protection type laser dust concentration detection device and a self-detection method thereof.
Background
The laser dust concentration detection device is a device for counting suspended particles in air or measuring mass concentration by using an MIE scattering theory. The dust concentration detecting device generally includes a fluid passage for flowing a gas, a laser generator for generating laser, and a laser detecting assembly for sensing scattered light. The airflow to be detected flows in the fluid flow channel, dust in the airflow to be detected is irradiated by laser to generate scattered light when flowing over the laser detection assembly, the laser detection assembly receives the scattered light, and the concentration detection condition of the dust in the airflow to be detected is obtained through analysis of the scattered light.
Because just contain the dust originally in the air current that lets in, have the dust after using for a long time on laser determine module and laser generator's lens, dust on the laser generator influences the laser power, thereby the influence detects the accuracy nature, dust on the laser determine module is the biggest to accurate measuring influence, because it influences laser signal's receipt, therefore, present laser dust concentration detects and all needs regular clearance with the device, influence production efficiency when too frequently the cost is higher if the clearance, if the clearance frequency is low can influence the detection precision, detect inaccurately, detect and bring inconvenience for the emission of all kinds of fume exhaust, influence the atmospheric environment pollution seriously.
Disclosure of Invention
The invention aims to solve the problems that the maintenance cost is high and the production efficiency is influenced due to the fact that the conventional laser dust concentration detection device is cleaned too frequently, and provides a gas path protection type laser dust concentration detection device and a self-detection method thereof.
In order to achieve the above purpose, the invention provides the following technical scheme:
the gas path protection type laser dust concentration detection device comprises a main laser generator, a laser receiver, a scattering photoreceptor and a body, the body is provided with a detection chamber, an emission chamber, an air inlet channel and an air outlet channel, the detection chamber is respectively communicated with the light path channel of the main laser generator, the detection channel of the scattering photoreceptor, the light path channel of the laser receiver, the air inlet channel and the air outlet channel, the emission chamber is communicated with the detection chamber through a main light hole, the emergent laser of the main laser generator penetrates through the emission chamber and the main light hole and is emitted into the detection chamber, part of the laser penetrates through the light of the detection chamber and reaches a laser receiver, and part of the laser reaches a scattering photoreceptor through the scattering of dust in the detection chamber, the body is provided with a first air inlet pipe communicated with the emission chamber, and the pipe orifice of the first air inlet pipe is not aligned with the main light hole.
As preferred, set up on the body through the receiving hole with the receiving chamber of detection room intercommunication, the scattering photoreceptor sets up being close to of receiving chamber the one end of detection room, laser receiver sets up the other end of receiving chamber, be provided with on the body with the second intake pipe of receiving chamber intercommunication, the mouth of pipe of second intake pipe not with the receiving hole aligns, thereby sets up the second intake pipe and can let in dustless air current so that the air current detects the room by the receiving chamber flow direction to the second intake pipe, under the drive of this air current, can reduce by a wide margin by the dust that detects the room and escape to the receiving chamber to the frequency of scattering photoreceptor can be cleaned by a wide margin, thereby can further reduce by a wide margin and dismantle gas circuit protection formula laser dust concentration detection device with clear frequency.
Preferably, the gas circuit protection type laser dust concentration detection device further comprises a first fan communicated with the first gas inlet pipe and a second fan communicated with the second gas inlet pipe, wherein the first fan is used for supplying dust-free gas flow to the first gas inlet pipe, and the second fan is used for supplying dust-free gas flow to the second gas inlet pipe.
Preferably, the gas path protection type laser dust concentration detection device further comprises an auxiliary laser generator, and the emergent laser of the auxiliary laser generator reaches the scattering photoreceptor.
Preferably, the gas path protection type laser dust concentration detection device further comprises a scattering lens movably arranged on the body, the scattering lens can move to/out of a laser light path between the main laser generator and the laser receiver, when the scattering lens moves to the laser light path between the main laser generator and the laser receiver, a part of laser incident to the scattering lens is transmitted to the laser receiver through the scattering lens, and a part of laser is reflected to the scattering photoreceptor through the scattering lens.
Preferably, the emission chamber is communicated with the detection chamber through a main light hole and an auxiliary light hole, laser emitted by the main laser generator is emitted into the emission chamber and emitted from the main light hole to enter the detection chamber, and laser emitted by the auxiliary laser generator is emitted into the emission chamber and emitted from the auxiliary light hole to enter the detection chamber;
set up dustproof lens in the launching chamber, main laser generator with vice laser generator sets up the one end of launching chamber, main unthreaded hole with vice unthreaded hole sets up the other end of launching chamber, thereby dustproof lens sets up thereby will between two tip of launching chamber the launching chamber cuts off for two cavities that do not communicate.
Preferably, the body is provided with a containing chamber for containing a scattering lens, and the containing chamber is used for containing the scattering lens when the scattering lens moves out of a laser path between the main laser generator and the laser receiver.
The application also discloses a dust concentration detection device's self-checking method, dust concentration detection device is the gas circuit protection formula laser dust concentration detection device of the aforesaid vice laser generator in addition, and outside air current does not get into inlet channel closes main laser generator, starts vice laser generator, and the scattering photoreceptor is penetrated to the laser that sends by vice laser generator, if the photoelectric signal that the scattering photoreceptor appears is not less than first preset photoelectric signal, then the scattering photoreceptor is not by dust pollution, otherwise the scattering photoreceptor has been polluted.
Preferably, the scattering photoreceptor is cleaned, the external air flow does not enter the air inlet channel, the main laser generator is closed, the auxiliary laser generator is started, the laser emitted by the auxiliary laser generator is injected into the scattering photoreceptor, the photoelectric signal appearing on the scattering photoreceptor is the first preset photoelectric signal, or the photoelectric signal is repeated for multiple times to obtain multiple photoelectric signals under the condition of the method according to the claim, and the minimum value is taken as the first preset photoelectric signal.
The application also discloses a self-checking method of the dust concentration detection device, wherein the dust concentration detection device is the gas path protection type laser dust concentration detection device containing the auxiliary laser generator and the scattering lens, and whether the scattering photoreceptor is polluted is detected through the self-checking method;
if the scattering photoreceptor is not polluted, external air flow does not enter the air inlet channel, the auxiliary laser generator is closed, the scattering lens is moved to enable the scattering lens to move to a laser light path between the main laser generator and the laser receiver, the main laser generator is started, if a photoelectric signal appearing on the scattering photoreceptor is not lower than a second preset photoelectric signal, a laser light path between the main laser generator and the laser receiver is not polluted, and otherwise, a laser light path between the main laser generator and the laser receiver is polluted.
Preferably, the scattering photoreceptor is cleaned, a laser light path between the main laser generator and the laser receiver is cleaned, external air does not enter an air inlet channel, the auxiliary laser generator is closed, the scattering lens is moved to enable the scattering lens to move to the laser light path between the main laser generator and the laser receiver, the main laser generator is started, a photoelectric signal appearing on the scattering photoreceptor is the second preset photoelectric signal, or the photoelectric signal is repeated for multiple times to obtain multiple photoelectric signals under the method state of the claim, and the minimum value is taken as the second preset photoelectric signal.
Compared with the prior art, this application gas circuit protection formula laser dust concentration detection device's beneficial effect: thereby set up first intake pipe and can let in dustless air current so that the air current detects the room by the transmission room flow direction to first intake pipe, under the drive of this air current, can reduce by a wide margin and ease the dust volume to the transmission room by detecting the room to can reduce by a wide margin the frequency of clean main laser generator to the laser light path that detects the room, thereby can reduce by a wide margin and dismantle gas circuit protection formula laser dust concentration detection device with clear frequency.
Compared with the prior art, the gas circuit protection type laser dust concentration detection device and the self-checking method of the dust concentration detection device have the beneficial effects that: whether can detect the scattering photoreceptor through vice laser generator and be contaminated, thereby go clean again and guarantee when guaranteeing that clean portion is frequent to detect the accuracy, save clear maintenance cost's assurance testing result after confirming the scattering photoreceptor is contaminated, in addition, this application main laser generator and vice laser generator all share same dustproof lens and transmission room, overall structure is simple, low cost.
Compared with the prior art, this application adopts scattering lens to the beneficial effect of dust concentration detection device's self-checking method: whether the scattering photoreceptor and the laser light path between the main laser generator and the detection chamber are polluted or not can be detected successively, and the laser type dust concentration detection device is polluted by dust and needs to be cleaned, namely, two parts.
Description of the drawings:
FIG. 1 is a schematic structural diagram of a gas circuit protection type laser dust concentration detection device according to the present application;
FIG. 2 is a working state diagram of the gas circuit protection type laser dust concentration detection device of the present application when detecting dust concentration normally;
FIG. 3 is a diagram illustrating an operation state of the secondary laser generator for inspection according to the present application;
FIG. 4 is a diagram of the state of operation of the diffuser lens for inspection;
fig. 5 is a diagram of an operating state of another embodiment of the gas circuit protection type laser dust concentration detection device of the present application, which is different from fig. 2, wherein solid arrows indicate a flow direction of a dust-containing gas flow, and hollow arrows indicate a flow direction of a dust-free gas flow;
the labels in the figure are: 100-dust, 110-main laser generator, 130-laser receiver, 140-scattering photoreceptor, 150-auxiliary laser generator, 160-scattering lens, 170-dustproof lens, 210-detection chamber, 220-air outlet channel, 230-air inlet channel, 240-receiving chamber, 241-receiving hole, 242-containing chamber, 250-emission chamber, 251-main light hole, 252-auxiliary light hole, 261-first air inlet pipe and 262-second air inlet pipe.
Detailed Description
The present invention will be described in further detail with reference to test examples and specific embodiments. It should be understood that the scope of the above-described subject matter is not limited to the following examples, and any techniques implemented based on the disclosure of the present invention are within the scope of the present invention.
As shown in fig. 1, a gas path protection type laser dust concentration detection device includes a main laser generator 110, a secondary laser generator 150, a laser receiver 130, a scattering photoreceptor 130 and a body, wherein the body is provided with an emission chamber 250, a detection chamber 210, a receiving chamber 240, an air inlet channel 230 and an air outlet channel 220, the detection chamber 210 is respectively communicated with a light path channel of the main laser generator 110, a detection channel of the scattering photoreceptor 130, a light path channel of the laser receiver 130, the air inlet channel 230 and the air outlet channel 220, the emission chamber 250 is arranged between the main laser generator 110 and the secondary laser generator 150 and the detection chamber 210, the receiving chamber 240 is arranged between the laser receiver 130 and the detection chamber 210, the emission chamber 250 is communicated with the detection chamber 210 through a main light hole 251 and a secondary light hole 252, laser emitted from the main laser generator 110 is emitted into the emission chamber 250 and emitted from the main light hole 251 into the detection chamber 210, laser emitted by the secondary laser generator 150 is emitted into the emission chamber 250 and emitted from the secondary light hole 252 to enter the detection chamber 210, the emission chamber 250 is communicated with the detection chamber 210 through two holes, compared with the situation that the side wall of the emission chamber 250 spaced from the detection chamber 210 is completely open, dust 100 in the detection chamber 210 can be prevented from being scattered to the emission chamber 250 to pollute the primary laser generator 110 and the secondary laser generator 150 due to the communication of the holes, the detection precision can be improved, and the cleaning frequency can be reduced.
Mainly, the sub laser generator 150 emits laser light to the scattering photoreceptor 130, and the sub laser generator 150 is provided on the basis of the main laser generator 110 to detect whether the lens of the scattering photoreceptor 130 is contaminated, that is, whether the lens is contaminated with dust 100. Specifically, when the dust 100 concentration detection device of the present embodiment is in normal use, an external fan sucks the air outlet channel 220, so that the detection chamber 210 generates negative pressure, a dust-containing airflow enters the detection chamber 210 from the air inlet channel 230, the laser emitted by the main laser generator 110 enters the detection chamber 210, a portion of the laser passing through the detection chamber 210 reaches the laser receiver 130, a portion of the laser scatters the dust 100 in the detection chamber 210 to reach the scattering photoreceptor 130, the more the dust 100 contained in the airflow, the more the scattering laser scattered by the dust 100 enters the scattering photoreceptor 130, the stronger the photoelectric signal of the scattering photoreceptor 130, and thus the dust content in the airflow can be detected. When it is required to detect whether the scattering photoreceptor 130 is contaminated by the dust 100, the external fan stops operating, external air flow does not enter the air inlet channel 230 to ensure that the dust 100 in the detection chamber 210 is detected, the main laser generator 110 is turned off, then the secondary laser generator 150 is turned on, and laser light emitted by the secondary laser generator 150 enters the scattering photoreceptor 130, specifically, as shown in fig. 3, if the photoelectric signal appearing on the scattering photoreceptor 130 is not lower than the first preset photoelectric signal, the scattering photoreceptor 130 is not contaminated by the dust 100, the scattering photoreceptor 130 normally operates, the scattering photoreceptor 130 does not need to be cleaned, and if the photoelectric signal appearing on the scattering photoreceptor 130 is lower than the first preset photoelectric signal, it is indicated that the scattering photoreceptor 130 is contaminated and needs to be cleaned as soon as possible. For the first preset photoelectric signal, the photoelectric signal generated by the laser with the designated intensity emitted by the secondary laser generator 150 can be detected under the condition that the scattering photoreceptor 130 is not polluted, the photoelectric signal is sequentially used as a preset normal photoelectric signal, or multiple repeated tests are performed to obtain multiple photoelectric signals, an obvious error value is eliminated, and the minimum value of the remaining photoelectric signals is taken as the first preset photoelectric signal.
The intensity of the laser light emitted from the secondary laser generator 150 is 50% to 90% of the intensity of the laser light emitted from the primary laser generator 110, and is set so that the intensity of the laser light emitted from the secondary laser generator 150 is 50%, 60%, 70%, 80%, or 90% of the intensity of the laser light emitted from the primary laser generator 110 in order to prevent the intensity of the secondary laser light from being too strong to exceed the range of the scattering photoreceptor 130, and if the intensity of the secondary laser light exceeds the range, even if the secondary laser light is contaminated, the intensity of the laser light emitted from the secondary laser generator 150.
As shown in fig. 1, the scattering lens 160 is movably disposed on the main body, and the scattering lens 160 can move to/from the laser path between the main laser generator 110 and the laser receiver 130, as shown in fig. 1, 2 and 3, the scattering lens 160 is moved to/from the laser path between the main laser generator 110 and the laser receiver 130, that is, the laser emitted from the main laser generator 110 passes through the reaction chamber and then directly emits to the laser receiver 130; fig. 4 illustrates a state in which the scattering lens 160 is moved downward to a laser beam path between the main laser generator 110 and the laser receiver 130, that is, the laser beam emitted from the main laser generator 110 passes through the reaction chamber and then is emitted to the scattering lens 160, and the laser beam passing through the scattering lens 160 is emitted to the laser receiver 130.
Fig. 1, 2 and 3 show the state of the dust 100 concentration detection device in normal use according to the present embodiment, the scattering lens 160 is used to detect whether the laser path between the main laser generator 110 and the detection chamber 210 is contaminated by the dust 100, specifically, during detection, the scattering photoreceptor 130 is first used to detect whether the laser path is contaminated by the dust 100, after the scattering photoreceptor is not contaminated by the dust 100, the external fan is still closed, the external air flow does not enter the air inlet channel 230 to ensure the dust 100 in the detection chamber 210, the secondary laser generator 150 is closed, the scattering lens 160 is moved to move the scattering lens 160 to the laser path between the main laser generator 110 and the laser receiver 130, the main laser generator 110 is started, as shown in fig. 4, the laser emitted from the main laser generator 110 enters the reaction chamber through the emission chamber 250 and the main optical aperture 251, because the reaction chamber does not have the dust 100, therefore, all the laser passes through the reaction chamber and enters the scattering lens 160, a part of the laser entering the scattering lens 160 is transmitted and then emitted to the laser receiver 130, a part of the laser is reflected by the scattering lens 160 and emitted to the scattering photoreceptor 130, if the photoelectric signal generated by the scattering photoreceptor 130 is not lower than the second preset photoelectric signal, the laser path from the main laser generator 110 to the detection chamber 210 is not polluted by the dust 100, if the photoelectric signal generated by the scattering photoreceptor 130 is lower than the second preset photoelectric signal, the laser path from the main laser generator 110 to the detection chamber 210 is polluted by the dust 100, generally, if there is no other object in the laser path from the main laser generator 110 to the detection chamber 210, the main laser generator 110 is polluted or faulty, if there is the dust-proof lens 170 in the laser path from the main laser generator 110 to the detection chamber 210, this indicates that the dust-proof lens 170 is contaminated with dust 100 or that the main laser generator 110 is malfunctioning, and needs to be cleaned or repaired as soon as possible.
For the second preset photoelectric signal, under the condition that it is ensured that the scattering photoreceptor 130 is not polluted and the laser light path between the main laser generator 110 and the detection chamber 210 is not polluted by the dust 100, the blower is turned off to prevent the dust 100 from entering the detection chamber 210, the scattering lens 160 is moved down to move the scattering lens 160 to the laser light path between the main laser generator 110 and the laser receiver 130, which is the state shown in fig. 4, the auxiliary laser generator 150 is turned off, the main laser generator 110 is started, and the photoelectric signal received by the scattering photoreceptor 130 is the second preset photoelectric signal.
As shown in fig. 1, dust-proof lens 170 is arranged in emission chamber 250, main laser generator 110 and auxiliary laser generator 150 are arranged at one end of emission chamber 250, main light hole 251 and auxiliary light hole 252 are arranged at the other end of emission chamber 250, dust-proof lens 170 is arranged between two ends of emission chamber 250 to separate emission chamber 250 into two chambers which are not communicated, thereby avoiding dust 100 from polluting main laser generator 110, and also avoiding dust 100 from polluting auxiliary laser generator 150, furthermore, main laser generator 110 and auxiliary laser generator 150 share the same dust-proof lens 170 and emission chamber 250, and the whole structure is simple, and the cost is low.
As shown in fig. 1, a receiving chamber 240 of the main body is provided at a sidewall thereof with a receiving chamber 242 for receiving the scattering lens 160, so as to receive the scattering lens 160 when the scattering lens 160 moves out of the laser path between the main laser generator 110 and the laser receiver 130, thereby preventing the scattering lens 160 from being contaminated by the dust 100 when the scattering lens 160 is not used.
Further, as shown in fig. 1 and 5, a first air inlet pipe 261 is disposed on the body and communicates with the emission chamber 250, and a nozzle of the first air inlet pipe 261 is not aligned with the main light hole 251 and not aligned with the auxiliary light hole 252, so that the air flow entering the emission chamber 250 from the first air inlet pipe 261 is difficult to blow, and the dust-containing air flow in the detection chamber 210 is prevented from being brought into the receiving chamber 240 by the air flow from the first air inlet pipe 261 to pollute the scattering photoreceptor 130, and in addition, a second air inlet pipe 262 is disposed in the receiving chamber 240, and a nozzle of the second air inlet pipe 262 is not aligned with the receiving hole 241, and the air flow from the second air inlet pipe 262 is prevented from bringing the dust-containing air flow in the detection chamber 210 into the emission chamber 250 to pollute the laser light path from the main laser generator.
The first air inlet pipe 261 is arranged to reduce the possibility that the dust 100 drifts from the detection chamber 210 to enter the emission chamber 250 and can be basically completely avoided, and the second air inlet pipe 262 is arranged to reduce the possibility that the dust 100 drifts from the detection chamber 210 to enter the receiving chamber 240 and can also be basically completely avoided, specifically, the first air inlet pipe 261 and the second air inlet pipe 262 are communicated with an air pump to enable the air pump to supply dust-free air flow to the first air inlet pipe 261 and the second air inlet pipe 262, so that the dust-free air flow is introduced into the emission chamber 250 through the first air inlet pipe 261 and then enters the detection chamber 210 through the main light hole 251 and the auxiliary light hole 252 of the emission chamber 250, and the dust 100 can be greatly prevented from entering the emission chamber 250 to pollute the light path along with the flow of the dust-containing air flow in the detection chamber 210 through the main; the same applies to the second air inlet pipe 262, and a dust-free air flow is introduced into the second air inlet pipe 262 through the air pump to enter the receiving chamber 240 and then flows from the receiving hole 241 to the detection chamber 210, so that the dust 100 is greatly prevented from entering the receiving chamber 240 to contaminate the scattering photoreceptor 130 while allowing the laser to pass through the receiving hole 241.
Preferably, the air flow rate entering the first air inlet pipe 261 and the second air inlet pipe 262 cannot be too fast, and specifically, the air flow rate flowing from the receiving hole 241 to the detection chamber 210 is suitable, and the suitable air flow rate enables most of the air flow flowing out from the receiving hole 241 to enter the air outlet channel 220 and flow out of the body, so that the air flow from the receiving hole 241 is difficult to flush into the main light hole 251 or the secondary light hole 252; the same applies to the flow rate of the air flowing into the detection chamber 210 through the main light hole 251 or the auxiliary light hole 252, and most of the air flowing out from the receiving hole 241 enters the air outlet channel 220 and flows out of the main body, so that the air flowing from the receiving hole 241 of the main light hole 251 or the auxiliary light hole 252 hardly flows into the receiving hole 241.
Claims (9)
1. The gas path protection type laser dust concentration detection device comprises a main laser generator (110), a laser receiver (130), a scattering photoreceptor (130) and a body, wherein the body is provided with a detection chamber (210), an emission chamber (250), an air inlet channel (230) and an air outlet channel (220), the detection chamber (210) is respectively communicated with the light path channel of the main laser generator (110), the detection channel of the scattering photoreceptor (130), the light path channel of the laser receiver (130), the air inlet channel (230) and the air outlet channel (220), the emission chamber (250) is communicated with the detection chamber (210) through a main light hole (251), emergent laser of the main laser generator (110) penetrates through the emission chamber (250) and the main light hole (251) to be emitted into the detection chamber (210), and part of laser penetrates through the light of the detection chamber (210) to reach the laser receiver (130), a part of laser reaches a scattering photoreceptor (130) through scattering of dust (100) in a detection chamber (210), and the scattering photoreceptor is characterized in that a first air inlet pipe (261) communicated with an emission chamber (250) is arranged on the body, and a pipe orifice of the first air inlet pipe (261) is not aligned with the main unthreaded hole (251).
2. The gas path protection type laser dust concentration detection device as claimed in claim 1, wherein a receiving chamber (240) communicated with the detection chamber (210) through a receiving hole (241) is arranged on the body, the scattering photoreceptor (130) is arranged at one end of the receiving chamber (240) close to the detection chamber (210), the laser receiver (130) is arranged at the other end of the receiving chamber (240), a second gas inlet pipe (262) communicated with the receiving chamber (240) is arranged on the body, and a pipe orifice of the second gas inlet pipe (262) is not aligned with the receiving hole (241).
3. The gas circuit protection type laser dust concentration detection device according to claim 2, further comprising a first fan communicated with the first gas inlet pipe (261) and a second fan communicated with the second gas inlet pipe (262), wherein the first fan is used for supplying dust-free gas flow to the first gas inlet pipe (261), and the second fan is used for supplying dust-free gas flow to the second gas inlet pipe (262).
4. The gas path protection type laser dust concentration detection device according to claim 1 or 2, further comprising a secondary laser generator (150), wherein the emitted laser of the secondary laser generator (150) reaches the scattering photoreceptor (130).
5. The gas circuit protection type laser dust concentration detection device according to claim 4, further comprising a scattering lens (160) movably disposed on the body, wherein the scattering lens (160) is movably movable to move to/from a laser path between the main laser generator (110) and the laser receiver (130), when the scattering lens (160) moves to the laser path between the main laser generator (110) and the laser receiver (130), a part of laser light incident on the scattering lens (160) is transmitted through the scattering lens (160) to the laser receiver (130), and a part of laser light reflected by the scattering lens (160) is transmitted to the scattering photoreceptor (130).
6. The gas path protection type laser dust concentration detection device as claimed in claim 5, wherein the emission chamber (250) is communicated with the detection chamber (210) through a main light hole (251) and a secondary light hole (252), laser emitted from the main laser generator (110) is emitted into the emission chamber (250) and emitted from the main light hole (251) to enter the detection chamber (210), and laser emitted from the secondary laser generator (150) is emitted into the emission chamber (250) and emitted from the secondary light hole (252) to enter the detection chamber (210);
a dustproof lens (170) is arranged in the emission chamber (250), the main laser generator (110) and the auxiliary laser generator (150) are arranged at one end of the emission chamber (250), the main light hole (251) and the auxiliary light hole (252) are arranged at the other end of the emission chamber (250), and the dustproof lens (170) is arranged between two end parts of the emission chamber (250) so as to partition the emission chamber (250) into two non-communicated chambers.
7. The gas circuit protection type laser dust concentration detection device according to claim 4, wherein the body is provided with a containing chamber (242) for containing a scattering lens (160), and the containing chamber is used for containing the scattering lens (160) when the scattering lens (160) moves out of the laser light path between the main laser generator (110) and the laser receiver (130).
8. The self-checking method of the dust concentration detection device, the dust (100) concentration detection device is the gas path protection type laser dust concentration detection device according to any one of claims 4 to 7, characterized in that, the external air flow does not enter the air inlet channel (230), the main laser generator (110) is closed, the auxiliary laser generator (150) is started, the laser emitted by the auxiliary laser generator (150) is injected into the scattering photoreceptor (130), if the photoelectric signal generated by the scattering photoreceptor (130) is not lower than the first preset photoelectric signal, the scattering photoreceptor (130) is not polluted by the dust (100), otherwise, the scattering photoreceptor (130) is polluted.
9. The self-checking method of the dust concentration detection device is characterized in that the dust (100) concentration detection device is the gas path protection type laser dust concentration detection device of claim 5 or 6, and the self-checking method of claim 8 is used for detecting whether the scattering photoreceptor (130) is polluted or not;
if the scattering photoreceptor (130) is not polluted, external air flow does not enter the air inlet channel (230), the secondary laser generator (150) is closed, the scattering lens (160) is moved to enable the scattering lens (160) to move to a laser light path between the main laser generator (110) and the laser receiver (130), the main laser generator (110) is started, if a photoelectric signal appearing on the scattering photoreceptor (130) is not lower than a second preset photoelectric signal, a laser light path between the main laser generator (110) and the laser receiver (130) is not polluted, and otherwise, the laser light path between the main laser generator (110) and the laser receiver (130) is polluted.
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