CN201259489Y - Laser powder detection instrument having humidity continuous self-correction - Google Patents

Abstract

The utility model relates to a laser mill-dust detection instrument with a moisture continuous automatic correction function, which comprises a dark chamber that is provided with an air inlet and an air outlet, wherein, an air passage that is separated by two separation plates is arranged between the air inlet and the air outlet, and one end of the dark chamber is provided with a light source that is generated by a laser generator, and the other end of the dark chamber is provided with an optics lens set and a photo electric receiver corresponding to the light source, and the two separation plates are provided with a light outlet hole corresponding to the light source; the air outlet of the dark chamber is connected with an air pump, a moisture sensor and an air discharging port in turn; the photoelectric receiver is connected with a pre-amplifier, an integration circuit, an analog-to-digital converter and a single chip in turn; and the moisture sensor and the laser generator are respectively connected with the single chip through a data line, and a moisture correcting module, a mill-dust concentration over-proof alarming threshold value, a quality concentration transforming coefficient K value and a Chinese character base are arranged inside the single chip in advance. The laser mill-dust detection instrument can perform the continuous automatic correction on the measurement result of the mill-dust (particles) concentration according to the variation of the environmental moisture.

Description

Laser dust detector with humidity continuous self-correcting function

Technical field

The utility model relates to a kind of detecting instrument, particularly about a kind of laser dust (particle) detector 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 utility model provides a kind of can the variation according to ambient humidity, the measurement result of dust (particle) concentration is carried out laser dust (particle) detector of revising automatically continuously.

For achieving the above object, the utility model is taked 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 the substrate value of laser dust detector, 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.

The utility model is owing to take above technical scheme, it has the following advantages: 1, the utility model is owing to be provided with a humidity sensor, and in single-chip microcomputer, be provided with a humidity correcting module, therefore, the utility model 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 utility model 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 utility model 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 a structural representation of the present utility model

Embodiment

Below in conjunction with drawings and Examples the utility model is described in detail.

As shown in Figure 1, the utility model 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.

Photelectric receiver 8 in the light path system passes through prime amplifier 16 and integrating circuit 17 in regular turn with dust (particle) the scattered light light intensity signal that receives, convert 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) to through analog to digital converter 18 then, be transported to single-chip microcomputer 7 at last, prime amplifier 16, integrating circuit 17 and analog to digital converter 18 are this area common equipment, are not described in detail in this.

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).

During the utility model operation, at first, after tested gas is inhaled into air intake opening 1, successively by gas channel 3, darkroom 3, aspiration pump 13 and humidity sensor 14, discharge by an exhausr port 15 at last, 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 the substrate value (CPM) of laser dust detector.

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 utility model can also detect the air humidity of tested gas place environment in real time continuously by humidity sensor 14, and according to the ambient humidity variation, the measurement result of dust concentration is carried out revising automatically continuously, obtain 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 solutions of the utility model,, should not get rid of outside protection domain of the present utility model improvement and the equivalents that individual component is carried out.

Claims (3)

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 the substrate value of laser dust detector, 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.

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