CN101354332A - Laser powder dust detector with humidity continuous self-correcting function and detecting method thereof - Google Patents
Laser powder dust detector with humidity continuous self-correcting function and detecting method thereof Download PDFInfo
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- CN101354332A CN101354332A CNA2008102230784A CN200810223078A CN101354332A CN 101354332 A CN101354332 A CN 101354332A CN A2008102230784 A CNA2008102230784 A CN A2008102230784A CN 200810223078 A CN200810223078 A CN 200810223078A CN 101354332 A CN101354332 A CN 101354332A
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Abstract
The invention relates to a laser dust monitor with the function of continuously automatic modification of humidity and a monitoring method thereof. The laser dust monitor comprises: a dark chamber which is provided with an air inlet and an air outlet, and an air channel which is separated by two baffles is installed between the air inlet and the air outlet; a light source which is generated by a laser generator is arranged at one end of the dark chamber, an optical lens group and a photoelectric receiver are arranged in sequence corresponding to the light source at the other end of the dark chamber, two baffles are provided with light-emitting holes corresponding to the light source; an air extracting pump, a humidity transducer and a vent are connected with the air outlet of the dark chamber in sequence; a preamplifier, an integrator circuit, an analog-to-digital converter and a single chip processor are connected with the photoelectric receiver in sequence, wherein, the humidity transducer and the laser generator are respectively connected with the single chip processor through data wires, and the single chip processor is internally preset with a humidity modification module, alarm threshold to the excessive dust concentration, conversion coefficient k for transforming mass into concentration and Chinese character library. The invention can conduct continuously automatic modification to the detection result of dust (particulate matter) concentration according to the changes of the environment humidity.
Description
Technical field
The present invention relates to a kind of detecting instrument and detection method, particularly about a kind of laser dust (particle) detector and detection method with humidity continuous self-correcting function.
Background technology
At present, quick dust (particle) determining instrument that the home and abroad is all, such as environment friendly system widely used U.S. TOEM1400 cone vibration balance particle analyzer, also have the widely used various light scattering formulas of public place, labor operation scene and indoor and outdoor environmental monitoring to survey the β rays method dust measuring instrument of (powder) dirt instrument and various models, the capital is subjected to the influence of air humidity varies, especially under the environment of high humility, the measuring error of dust (particle) concentration can increase considerably.And in the various device of prior art, do not see that any dust (particle) determining instrument has when dust (particle) is measured, measure corresponding air humidity, and the measuring error of dust (particle) concentration that air humidity varies is produced is carried out the function revised automatically continuously.
Summary of the invention
At the problems referred to above, the purpose of this invention is to provide a kind of can the variation according to ambient humidity, the measurement result of dust (particle) concentration is carried out laser dust (particle) detector and the detection method revised automatically continuously.
For achieving the above object, the present invention takes following technical scheme: a kind of laser dust detector with humidity continuous self-correcting function, it is characterized in that: it comprises: one has the darkroom of an air intake opening and a gas outlet, two dividing plates are installed every the gas passage of establishing between described air intake opening and the gas outlet, described darkroom one end is provided with the light source that is produced by a laser generator, a corresponding optical lens group and the photelectric receiver of being disposed with described light source of the other end in described darkroom offers the light hole corresponding with described light source on described two dividing plates; The gas outlet in described darkroom connects an aspiration pump, a humidity sensor and an exhausr port in regular turn; Described photelectric receiver connects a prime amplifier, an integrating circuit, an analog to digital converter and a single-chip microcomputer in regular turn; Described humidity sensor is connected described single-chip microcomputer by data line respectively with laser generator, presets humidity correcting module, dust concentration exceed standard alarm threshold value, mass concentration conversion coefficient K value and Chinese character base in the described single-chip microcomputer.
Described laser generator connects described single-chip microcomputer by a laser power control.
Preset the mass concentration of dust and the relational expression between the humidity correction factor in the described humidity correcting module:
C＝(R-B)×K×F
F＝f(RH)
Wherein: F is a humidity correction factor; B is a substrate value of the present invention, and RH is the real-time humidity of air that described humidity sensor records, and R is the relative mass concentration of the dust that records of light path system, and K is the mass concentration conversion coefficient that is stored in the corresponding places in the described single-chip microcomputer.
A kind of employing has the detection method of the laser dust detector of humidity continuous self-correcting function, and it is characterized in that: it may further comprise the steps:
1) tested gas is in regular turn by air intake opening, gas channel, darkroom, aspiration pump and humidity sensor;
2) dust in the described tested gas produces scattered light under the infrared laser irradiation that light source sends, this scattered light is in regular turn by photelectric receiver, prime amplifier, integrating circuit and analog to digital converter, being converted to the per minute step-by-step counting that is directly proportional with dust concentration is the relative mass concentration R of dust, and is transported to described single-chip microcomputer;
3) the real-time humidity RH of air of the tested gas that will sense of described humidity sensor flows to described single-chip microcomputer;
4) the following formula of humidity correcting module utilization in the described single-chip microcomputer calculates the mass concentration C of dust, and its calculating formula is as follows:
F＝f(RH)
C＝(R-B)×K×F
In the formula: F is the humidity correction function; RH is the real-time humidity of air of the tested gas that records of humidity sensor; B is the substrate value of described laser dust detector; R is the relative mass concentration of the dust that records of light path system; K is the mass concentration conversion coefficient that is stored in the corresponding places in the described single-chip microcomputer.
The present invention is owing to take above technical scheme, it has the following advantages: 1, laser dust of the present invention (particle) instrument is owing to be provided with a humidity sensor, and in single-chip microcomputer, be provided with a humidity correcting module, therefore, the present invention not only can detect dust (particle) concentration, can also detect the air humidity of tested gas place environment, and revise the influence of humidity automatically dust (particle) mass concentration C.2, the present invention is owing to be provided with the mass concentration of dust (particle) and the relational expression between the humidity correction factor in the humidity correcting module, therefore can be in real time and continuously when detecting dust (particle) concentration to air humidity influence revise, and then obtain the mass concentration C of dust (particle) more accurately.The present invention can be widely used in dust (particle) detection of various public places or site for labour or outside atmosphere environment, particularly in humidity variation environment greatly.
Description of drawings
Fig. 1 is the structural representation of laser dust of the present invention (particle) detector
Embodiment
Below in conjunction with drawings and Examples the present invention is described in detail.
As shown in Figure 1, laser dust provided by the invention (particle) detector comprises an air intake opening 1, and air intake opening 1 connects a darkroom 3 by a gas channel 2.Darkroom 3 one ends are provided with a light source 4, and light source 4 connects a laser generator 5, a laser power control 6 and an one chip microcomputer (abbreviation single-chip microcomputer) 7 successively.Laser generator 5 adopts the semiconductor laser instrument, laser power control 6 links to each other with a single-chip microcomputer 7 by a control line, the power variation of light source 4 light flows to single-chip microcomputer 7 by a data line, send steering order by laser power control 6 to laser generator 5 by single-chip microcomputer 7 again, thereby realize the closed-loop control of Laser emission power, make the emissive porwer of laser constant, and then improve laser dust (particle) detector measuring stability.Wherein, preset humidity correcting module, dust (particle) concentration over-standard alarm threshold value and Chinese character base in the single-chip microcomputer 7.
The other end in darkroom 3 is provided with a photelectric receiver 8, photelectric receiver 8 and the light source 4 middle optical lens group 9 that are provided with, be provided with two dividing plates 10 between optical lens group 9 and the light source 4, two dividing plates 10 lay respectively at both sides, gas channel 2 below, all offer on two dividing plates 10 and light source 4 and optical lens group 9 corresponding light holes 11, leave the gap between the lower end of dividing plate 10 and the darkroom 3.
The below in darkroom 3 is provided with a gas outlet 12 relative with gas channel 2, and tested gas 12 enters an aspiration pump 13 through 3 backs, darkroom along the gas outlet, and the other end of aspiration pump 13 connects a humidity sensor 14 by pipeline.The tested gas humidity signal that humidity sensor 14 will be sensed transfers to single-chip microcomputer 7 by a data line, and simultaneously, humidity sensor 14 also connects an exhausr port 15, as the passage of discharging tested gas.
The demonstration output terminal of single-chip microcomputer 7 is connected with a LCD 19, in conjunction with the Chinese character base that presets in the single-chip microcomputer 7, can show all detection information by Chinese character.
In the foregoing description, laser dust (particle) detector also is provided with the calibrator unit of standard scatter plate self calibration system as instrument, it is the optical device of a standard, when instrument is made as align mode, scattering with standard scatter plate self calibration system squeezes into simulation particle in the light path comes calibration instrument as the standard scattered light.
In the foregoing description, power supply adopts the Ni-MH rechargeable battery, can use continuously 8 hours, and be equipped with power supply adaptor.
In the foregoing description, laser dust (particle) detector is fit to dust mass concentration, standard scatter plate self calibration, the warning of dust (particle) concentration over-standard of public place dust (particle) detection and is fit to general detections the such as timing sampling that atmospheric environment detects, and under the labour hygiene pattern, according to industry hygiene standard (GBZ1-2002) and workplace adverse factor exposure limit (GBZ2-2002) standard, calculate time weighted average (TWA) and STEL (STEL).Laser dust (particle) detector is provided with the measurement of surrounding air humidity especially, and by the humidity correcting module in the single-chip microcomputer 7, automatically eliminate the influence of humidity, thereby make the mass concentration of the dust (particle) that records more accurate the mass concentration of dust (particle).
The detection method of laser dust of the present invention (particle) detector is as follows:
At first, after tested gas is inhaled into air intake opening 1, by gas channel 3, darkroom 3, aspiration pump 13 and humidity sensor 14, discharge by an exhausr port 15 at last successively, the real-time humidity RH of the air of the tested gas that humidity sensor 14 will be sensed flows to single-chip microcomputer 7.In darkroom 3, dust (particle) produces scattered light under the infrared laser irradiation that light source 4 sends, after the scattered light light intensity signal receives through photelectric receiver 8, again in regular turn by prime amplifier 16, integrating circuit 17 and analog to digital converter 18, be converted into the relative mass concentration R (CPM) that the per minute step-by-step counting that is directly proportional with dust (particle) concentration is a dust (particle), and be transported to single-chip microcomputer 7.
The relative mass concentration R (CPM) of the real-time humidity RH of air of the tested gas that records according to above humidity sensor 14, the dust (particle) that light path system records and be stored in the mass concentration conversion coefficient K (mg/m3CPM) of the corresponding places in the single-chip microcomputer 7, the humidity correcting module that presets in the single-chip microcomputer 7 can utilize the following formula that presets within it that the mass concentration C (mg/m3) of dust (particle) is calculated, and its calculating formula is as follows:
C＝(R-B)×K×F
F＝f(RH)
In the formula: F is a humidity correction factor; B is a substrate value of the present invention (CPM).
The mass concentration C of the dust in the following formula (particle) has utilized the humidity correcting module, and correction air humidity is to the influence of the mass concentration C of dust (particle) automatically.When the mass concentration C of the dust that records (particle) surpassed dust (particle) the concentration over-standard alarm threshold value that presets in the single-chip microcomputer 7, single-chip microcomputer 7 sent alarm command.Therefore, the present invention can also detect the air humidity of tested gas place environment in real time continuously by humidity sensor 14, and changes according to ambient humidity, and the measurement result of dust concentration is carried out revising automatically continuously, obtains more accurate dust concentration.
In the various embodiments described above, the structure of each parts, the position is set and connects and all can change to some extent, on the basis of technical solution of the present invention,, should not get rid of outside protection scope of the present invention improvement and the equivalents that individual component is carried out.
Claims (4)
1, a kind of laser dust detector with humidity continuous self-correcting function, it is characterized in that: it comprises: one has the darkroom of an air intake opening and a gas outlet, two dividing plates are installed every the gas passage of establishing between described air intake opening and the gas outlet, described darkroom one end is provided with the light source that is produced by a laser generator, a corresponding optical lens group and the photelectric receiver of being disposed with described light source of the other end in described darkroom offers the light hole corresponding with described light source on described two dividing plates; The gas outlet in described darkroom connects an aspiration pump, a humidity sensor and an exhausr port in regular turn; Described photelectric receiver connects a prime amplifier, an integrating circuit, an analog to digital converter and a single-chip microcomputer in regular turn; Described humidity sensor is connected described single-chip microcomputer by data line respectively with laser generator, presets humidity correcting module, dust concentration exceed standard alarm threshold value, mass concentration conversion coefficient K value and Chinese character base in the described single-chip microcomputer.
2, the laser dust detector with humidity continuous self-correcting function as claimed in claim 1, it is characterized in that: described laser generator connects described single-chip microcomputer by a laser power control.
3, the laser dust detector with humidity continuous self-correcting function as claimed in claim 1 or 2 is characterized in that: preset the mass concentration of dust and the relational expression between the humidity correction factor in the described humidity correcting module:
C＝(R-B)×K×F
F＝f(RH)
Wherein: F is a humidity correction factor; B is a substrate value of the present invention, and RH is the real-time humidity of air that described humidity sensor records, and R is the relative mass concentration of the dust that records of light path system, and K is the mass concentration conversion coefficient that is stored in the corresponding places in the described single-chip microcomputer.
4, a kind of laser dust detection method that adopts as device as described in the claim 1～3 with humidity continuous self-correcting function, it is characterized in that: it may further comprise the steps:
1) tested gas is in regular turn by air intake opening, gas channel, darkroom, aspiration pump and humidity sensor;
2) dust in the described tested gas produces scattered light under the infrared laser irradiation that light source sends, this scattered light is in regular turn by photelectric receiver, prime amplifier, integrating circuit and analog to digital converter, being converted to the per minute step-by-step counting that is directly proportional with dust concentration is the relative mass concentration R of dust, and is transported to described single-chip microcomputer;
3) the real-time humidity RH of air of the tested gas that will sense of described humidity sensor flows to described single-chip microcomputer;
4) the following formula of humidity correcting module utilization in the described single-chip microcomputer calculates the mass concentration C of dust, and its calculating formula is as follows:
F＝f(RH)
C＝(R-B)×K×F
In the formula: F is the humidity correction function; RH is the real-time humidity of air of the tested gas that records of humidity sensor; B is the substrate value of described laser dust detector; R is the relative mass concentration of the dust that records of light path system; K is the mass concentration conversion coefficient that is stored in the corresponding places in the described single-chip microcomputer.
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| CNA2008102230784A CN101354332A (en) | 2008-09-26 | 2008-09-26 | Laser powder dust detector with humidity continuous self-correcting function and detecting method thereof |
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| CNA2008102230784A CN101354332A (en) | 2008-09-26 | 2008-09-26 | Laser powder dust detector with humidity continuous self-correcting function and detecting method thereof |
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