CN205103129U - Novel particulate matter sensor - Google Patents

Abstract

The utility model provides a novel particulate matter sensor, novel particulate matter sensor is including measuring the light source, detecting pond, detector and analysis module, the particulate matter sensor further includes: the calibration light source, the detector sets up on the calibration light path of calibration light source output, electric signal transfer to the analysis module of output. The utility model has the advantages of precision height, simple structure, small, low -cost.

Description

Novel particle thing sensor

Technical field

The utility model relates to photoelectric analysis, the particularly detection of particle in gas.

Background technology

Particle refers to the solid particulate matter that in surrounding air, diameter is less than 2.5 microns.Because it is rich in a large amount of poisonous and harmful substances, can be suspended in air for a long time, sucking lung depths cannot discharge, and therefore all causes serious threat to resident's respiratory system incidence of disease, cardiovascular morbidity and mortality ratio.Particle concentration directly affects ambient air quality, therefore to the detection significance of particle.Elastic light scattering mensuration has that speed is fast, sensitivity high, is one of main method of monitoring particle concentration.Adopt the basic functional principle of the particle concentration sensor of elastic light scattering mensuration as follows: the particle in air can produce the scattered light signal proportional with particle size under the irradiation of light beam, this scattered light signal is by being converted to the voltage pulse signal of suitable amplitude after photodetector and pre-amplification circuit, again through the examination of electronic circuit, thus complete the stepping of electric impulse signal is counted.Now, potential pulse quantity corresponds to the number of particulate, and the amplitude of potential pulse corresponds to the size of particle.

Current particulate matter sensors is mainly used in being integrated in the equipment as purification of air instrument, not easily changes.With the long-time unlatching of air cleaning facility, the semiconductor laser output performance of particulate matter sensors is deteriorated.The semiconductor laser life-span that current particulate matter sensors uses generally does not grow (about 10000 hours), can not meet the needs as equipment such as purification of air instruments.And along with the obvious reduction of output power, the erroneous judgement that particle scattered signal can be caused to screen, causes measuring concentration of granules in certain result inaccurate.

Utility model content

For solving the deficiency in above-mentioned prior art, the utility model provide a kind ofly to detect accurately, structure is simple, volume is little, the particulate matter sensors of low cost.

The purpose of this utility model is achieved through the following technical solutions:

A kind of novel particle thing sensor, described novel particle thing sensor comprises measurement light source, detection cell, detector and analysis module; Described particulate matter sensors comprises further:

Regulation light source, described detector is arranged on the alignment light path of described regulation light source output, and the electric signal of output is sent to analysis module.

According to above-mentioned novel particle thing sensor, preferably, described alignment light is directly incident on described detector.

According to above-mentioned novel particle thing sensor, preferably, the path of measurement light that sends perpendicular to described measurement light source of the normal of the photosurface of described detector.

According to above-mentioned novel particle thing sensor, alternatively, described novel particle thing sensor comprises further:

Matting module, the measurement light produced after scattered light enters in described matting module.

According to above-mentioned novel particle thing sensor, preferably, described matting module is cavity structure, described measurement light multiple reflections in described matting module.

Compared with prior art, the beneficial effect that the utility model has is:

1. detect accurately

Can before particle detect, the light intensity exported according to described regulation light source redefines the discrimination voltage of particle detection signal, avoids detector photosurface owing to causing erroneous judgement by particle blocks, and guarantee is known clearly the accurate of testing result;

Utilize the relation of scattered light signal and particle size, the content of particle in gas can be obtained, as PM10 value, PM2.5 value.

2. structure is simple, volume is little, low cost

Employ little, the lower powered semiconductor laser of volume, make whole sensor integration degree high, significantly reduce volume and cost, particulate matter sensors is really accomplished light, portable.

Accompanying drawing explanation

With reference to accompanying drawing, disclosure of the present utility model will be easier to understand.Those skilled in the art it is easily understood that: these accompanying drawings only for illustrating the technical solution of the utility model, and and are not intended to be construed as limiting protection domain of the present utility model.In figure:

Fig. 1 is the structure diagram of the novel particle thing sensor according to the utility model embodiment 1.

Embodiment

Fig. 1 and following description describe Alternate embodiments of the present utility model and how to implement to instruct those skilled in the art and to reproduce the utility model.In order to instruct technical solutions of the utility model, simplifying or having eliminated some conventional aspects.Those skilled in the art should understand that the modification that is derived from these embodiments or replace will in scope of the present utility model.Those skilled in the art should understand that following characteristics can combine to form multiple modification of the present utility model in every way.Thus, the utility model is not limited to following Alternate embodiments, and only by claim and their equivalents.

Embodiment:

Fig. 1 schematically illustrates the structure diagram of novel particle thing sensor of the present utility model, and as shown in Figure 1, described novel particle thing sensor comprises:

Measurement light source, as semiconductor laser, described measurement light source is used for sending measurement light;

Regulation light source, as pulse type semiconductor laser, detector is arranged on the alignment light path of described regulation light source output, and described alignment light is directly incident on described detector, without the need to passing through other optical device, the second electric signal that detector exports is sent to analysis module;

Detection cell, described detection cell has gas feed and outlet, for holding the gas carrying particle;

Detector, described detector is arranged on non-measured light path, for the scattered light of the described measurement light received in described detection cell is converted to the first electric signal; The normal of the photosurface of detector is vertical with optical path footpath;

Matting module, described matting module is cavity structure, produces the measurement light multiple reflections in described matting module after scattered light, thus reaches the object of delustring;

Analysis module, described analysis module is used for the signal exported according to scattering technology process detector, thus knows the content detecting particle in pool gas, as PM10, PM2.5.

According to the detection method of above-mentioned novel particle thing sensor, be also the method for work of novel particle thing sensor, described detection method comprises the following steps:

(A1) before particle detects, gas is not had to pass into detection cell;

The alignment light that regulation light source sends is directly incident on detector, and the second electric signal that detector exports send analysis module, thus forms the voltage pulse signal with master output, redefines the discrimination voltage of particle detection signal based on this standard;

(A2) the measurement light that measurement light source sends enters in detection cell, holds gas to be measured, have particle in gas to be measured in described detection cell;

(A3) described measurement light and described particle interact, and produce the scattered light corresponding with particle size;

(A4) described scattered light is converted to the first electric signal by detector, and send analysis module;

(A5) the described electric signal that receives according to light scattering technique process of described analysis module, thus obtain and detect particle content in pool gas, as PM10, PM2.5.

Be according to the benefit that the novel particle thing sensor of the utility model embodiment reaches: before each formal detection, the alignment light all utilizing regulation light source to send removes the discrimination voltage redefining particle (as PM10, PM2.5) detection signal, avoids the erroneous judgement of detector photosurface owing to causing by Particulate Pollution.

Claims (5)

1. a novel particle thing sensor, described novel particle thing sensor comprises measurement light source, detection cell, detector and analysis module; It is characterized in that: described particulate matter sensors comprises further:

Regulation light source, described detector is arranged on the alignment light path of described regulation light source output, and the electric signal of output is sent to analysis module.

2. novel particle thing sensor according to claim 1, is characterized in that: described alignment light is directly incident on described detector.

3. novel particle thing sensor according to claim 2, is characterized in that: the path of the measurement light that the normal of the photosurface of described detector sends perpendicular to described measurement light source.

4. novel particle thing sensor according to claim 1, is characterized in that: described novel particle thing sensor comprises further:

Matting module, the measurement light produced after scattered light enters in described matting module.

5. novel particle thing sensor according to claim 4, is characterized in that: described matting module is cavity structure, described measurement light multiple reflections in described matting module.