CN204514760U - A kind of high-precision laser particle sensor - Google Patents
A kind of high-precision laser particle sensor Download PDFInfo
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- CN204514760U CN204514760U CN201520192533.4U CN201520192533U CN204514760U CN 204514760 U CN204514760 U CN 204514760U CN 201520192533 U CN201520192533 U CN 201520192533U CN 204514760 U CN204514760 U CN 204514760U
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Abstract
The utility model provides a kind of high-precision laser particle sensor, described sensor comprises a scattered light gathering-device, a control device and a Laser Driven, wherein, one end of described Laser Driven is connected with described scattered light gathering-device, the other end is connected with described control device, described Laser Driven opens the laser instrument in described scattered light gathering-device, makes described laser instrument Emission Lasers; Described scattered light gathering-device is in order to Emission Lasers and collect scattered light signal, and converts described scattered light signal to voltage pulse signal; Described control device in order to control described Laser Driven, and then regulates the power of laser.High-precision laser particle sensor described in the utility model not only can determine particle diameter and the number of suspended particle described in air according to described laser power, but also the power of laser can be regulated, improve the precision and efficiency of detecting of described sensor, provide more accurate experimental data.
Description
Technical field
The utility model relates to a kind of sensor, particularly a kind of high-precision laser particle sensor.
Background technology
Laser particle sensor adopts laser light scattering principle.Even laser irradiates on aerial suspended particulate substance produce scattering, collect scattered light at a certain special angle simultaneously, obtain the pulse that scattered light intensity changes with suspended particulate substance.After microcontroller acquires data, obtain the relation between time-domain and frequency-domain by Fourier transform, draw the particle number of different-grain diameter in the equivalent grain size of particle and unit volume subsequently through series of complex algorithm.
But existing laser particle sensor can not regulate the power of laser.
In view of above-mentioned defect, the utility model creator obtains the utility model finally through long research and practice.
Utility model content
The purpose of this utility model is, provides a kind of high-precision laser particle sensor, in order to overcome above-mentioned technological deficiency.
For achieving the above object, the technical solution adopted in the utility model is, a kind of high-precision laser particle sensor is provided, described sensor comprises a scattered light gathering-device, a control device and a Laser Driven, wherein, one end of described Laser Driven is connected with described scattered light gathering-device, and the other end is connected with described control device, described Laser Driven opens the laser instrument in described scattered light gathering-device, makes described laser instrument Emission Lasers; Described scattered light gathering-device is in order to Emission Lasers and collect scattered light signal, and converts described scattered light signal to voltage pulse signal; Described control device in order to control described Laser Driven, and then regulates the power of laser.
High-precision laser particle sensor described in the utility model not only can obtain the scattered light intensity of suspended particle generation by described laser intensity, described scattered light signal is converted into described voltage pulse signal, particle diameter and the number of described suspended particle is judged again according to the amplitude of described voltage pulse signal and pulse number corresponding to described amplitude, but also the power of described laser can be regulated, to regulate the signal to noise ratio (S/N ratio) gathering scattered light intensity and the sensor of returning, form one and detect the circulation system, improve the precision and efficiency of detecting of described sensor, provide more accurate experimental data.
Preferably, described sensor also comprises a scavenger fan, described scavenger fan is connected with described control device, air in surveyed area is flowed and is in a state relatively stably, described control device by controlling the rotating speed of described scavenger fan, and then controls the speed air flow in described surveyed area.
Scavenger fan described in the utility model makes each particle in sampling air flow pass through with a stabilized speed straight line
inspectionsurvey region and improve the degree of accuracy measured.
Preferably, described sensor also comprises a prime amplifier and an AD converter, described prime amplifier and described scattered light gathering-device, in order to amplify the voltage pulse signal of described scattered light, described AD converter is connected with described prime amplifier, signal after described amplification is carried out analog to digital conversion, make change after signal identify by described control device.
Prime amplifier described in the utility model and described AD converter, after described scattered light signal is amplified, can measure particle diameter and the number of suspended particle more fully, make data more accurate.
Preferably, described scattered light gathering-device comprises a laser instrument, convex lens, a collimation lens, a photodiode and a light trapping; Wherein, described laser instrument is connected with described Laser Driven, in order to Emission Lasers; Described convex lens are connected with described laser instrument, make laser beam be compressed to a less focal spot; Described collimation lens is connected with described convex lens, in order to maintain the collimation of described laser beam; Described photodiode is positioned at immediately below the focal position of laser beam generation, in order to detect the voltage pulse signal that particle produces through described laser beam; Described light trapping is positioned at the working direction of described laser beam, in order to absorb described laser beam, stops it to enter scattered light collection system, meets the requirement of background noise.
The beneficial effects of the utility model are compared with the prior art: the high-precision laser particle sensor described in the utility model not only can obtain the scattered light intensity of suspended particle generation by described laser intensity, described scattered light signal is converted into described voltage pulse signal, particle diameter and the number of described suspended particle is judged again according to the amplitude of described voltage pulse signal and pulse number corresponding to described amplitude, but also the power of described laser can be regulated, to regulate the signal to noise ratio (S/N ratio) gathering scattered light intensity and the sensor of returning, form one and detect the circulation system, improve the precision and efficiency of detecting of described sensor, provide more accurate experimental data, scavenger fan described in the utility model makes each particle in sampling air flow pass through with a stabilized speed straight line
inspectionsurvey region and improve the degree of accuracy measured, prime amplifier described in the utility model and described AD converter, after described scattered light signal is amplified, can measure particle diameter and the number of suspended particle more fully, make data more accurate.
Accompanying drawing explanation
Fig. 1 is the fundamental diagram of the utility model high-precision laser particle sensor;
Fig. 2 is the structural drawing of scattered light gathering-device in the utility model;
Fig. 3 is the structured flowchart of embodiment one in the utility model.
Embodiment
Below in conjunction with accompanying drawing, to above-mentioned being described in more detail with other technical characteristic and advantage of the utility model.
Refer to shown in Fig. 1, it is the fundamental diagram of the utility model high-precision laser particle sensor; Described sensor comprises scattered light gathering-device 1, prime amplifier 2, one AD converter 3, control device 4, scavenger fan 5 and a Laser Driven 6, wherein, described scattered light gathering-device 1 Emission Lasers is irradiated on air, there is scattering effect, simultaneously at a certain angular collection scattered light signal, and described scattered light signal is converted into voltage pulse signal; Described prime amplifier 2 is connected with described scattered light gathering-device 1, in order to receive described voltage pulse signal, and carries out signal amplification process to described voltage pulse signal; Described AD converter 3 is connected with described prime amplifier 2, realizes analog to digital conversion, and is input in described control device 4, record amplitude and the number thereof of pulse in described voltage pulse signal to described voltage pulse signal after amplification; Described scavenger fan 5 is connected with described control device 4 respectively with described Laser Driven 6, and described control device 4 regulates the wind speed of described scavenger fan 5 according to the number of the suspended particle number detected, regulates laser power by described Laser Driven 6 simultaneously.
Described prime amplifier 2 screens for the voltage pulse signal after described amplification process, if the described voltage pulse signal amplitude after amplifying all is greater than the diameter of set described suspended particle, then described voltage pulse signal will be counted, otherwise described signal will not be recorded.
The wind speed changing described scavenger fan 5 is the flow velocity adjusting sampled air, is used for calibrating in concentration calculates.Change laser power, in order to improve the scattered light intensity of suspended particle, improve the signal to noise ratio (S/N ratio) of described sensor.
Start described scavenger fan 5, make air by air intake opening by the perception of described sensor institute, described scattered light gathering-device 1 Emission Lasers is irradiated on air, there is scattering effect, simultaneously at a certain angular collection to scattered light signal, and described scattered light signal is converted into voltage pulse signal, then described voltage pulse signal carries out signal by described prime amplifier 2 and amplifies process, by described AD conversion, simulating signal is converted to digital signal again, be input in described control device 4, according to the number of corresponding particle diameter suspended particle contained in the pulse number determination air in described voltage pulse signal with same magnitude, regulate the wind speed of described scavenger fan 5 and the laser power of described Laser Driven 6 simultaneously.
The scattering of light is after atom or molecular system obtain energy from incident light wave, changes the radiation again (secondary radiation is theoretical) of its direction of propagation and phase place, even frequency.According to Mie scattering basic theories, scattered light angular distribution not only depends on the size of the particle diameter of scattering particles, also relevant with lighting light wave wavelength with the refractive index of particle.
High-precision laser particle sensor described in the utility model not only can obtain the scattered light intensity of suspended particle generation by described laser intensity, described scattered light signal is converted into described voltage pulse signal, particle diameter and the number of described suspended particle is judged again according to the amplitude of described voltage pulse signal and pulse number corresponding to described amplitude, but also the wind speed of described scavenger fan 5 and the laser power of described Laser Driven 6 can be regulated, form one and detect the circulation system, improve the precision and efficiency of detecting of described sensor, provide more accurate experimental data.
The described detection circulation system comprises two systems, a circulation system is from described Laser Driven 6 to described scattered light gathering-device 1, then described prime amplifier 2 is arrived, arrive described AD converter 3 again, described control device 4, finally get back to described Laser Driven 6, constantly regulate described laser power, thus measure particle diameter and the number of suspended particle in air accurately; Another circulation system is from described scavenger fan 5 to described scattered light gathering-device 1, then described prime amplifier 2 is arrived, arrive described AD converter 3 again, described control device 4, finally get back to described scavenger fan 5, make the air mass flow through surveyed area be stabilized in the state of a relative equilibrium, improve the degree of accuracy measured.
Consult shown in Fig. 2, it is the structural drawing of scattered light gathering-device 1 in the utility model; Described scattered light gathering-device 1 comprises laser instrument 11, convex lens 12, collimation lens 13, photodiode 14 and a light trapping 15; Wherein, described laser instrument 11 is connected, in order to Emission Lasers with described Laser Driven 6; Described convex lens 12 are connected with described laser instrument 11, and make described laser beam be compressed to a less focal spot, described collimation lens 13 is connected with described convex lens 12, in order to maintain the collimation of described laser beam; Described photodiode 14 is connected with described collimation lens 13, in order to detect the light signal of described laser; Described light trapping 15 is positioned at the working direction of described laser beam, in order to absorb described laser beam, stops it to enter described scattered light gathering-device, meets the requirement of background noise.
Open described Laser Driven 6, make described laser instrument 11 Emission Lasers, by described convex lens 12, laser beam is made to be compressed to a less focal spot, and project on described collimation lens 13, and then by described collimation lens 13, make described laser generation focusing phenomenon, the focus of described laser beam is positioned at the top of described photodiode 14, described laser generation scattering phenomenon above described photodiode 14, inject in described light trapping 15, and described spread is no more than the controlled range of described light trapping 15.
First sample from air to be measured with certain sampling flow, when the particle in air to be measured is by the described laser illumination in described scattered light gathering-device, produce scattered light, then described scattered light is voltage pulse signal by described photodiode converts, described voltage pulse signal amplifies through described prime amplifier again, if the described voltage pulse signal amplitude after amplifying all is greater than the diameter of set described suspended particle, then described voltage pulse signal will be counted, otherwise this signal will not be recorded, therefore the potential pulse number measured is the number of described suspended particle, single voltage pulse amplitude is the diameter of single described suspended particle.Relation between the potential pulse number produced by described suspended particle and voltage pulse amplitude is called the voltage pulse signal amplitude distribution of described suspended particle, inverting can obtain the domain size distribution of described suspended particle by this distribution.
Embodiment one
Sensor as described above, the present embodiment and its difference are, consult shown in Fig. 3, and it is the structured flowchart of embodiment one in the utility model; Described sensor also comprises a display screen 7, and described display screen is connected with described control device, the particle diameter of suspended particle described in surveyed area and number in order to show, and demonstrates the pulse height that described laser power changes with suspended particle.
The foregoing is only preferred embodiment of the present utility model, is only illustrative for the utility model, and nonrestrictive.Those skilled in the art is understood, and can carry out many changes in the spirit and scope that the utility model claim limits to it, amendment, even equivalence, but all will fall in protection domain of the present utility model.
Claims (4)
1. a high-precision laser particle sensor, it is characterized in that, described sensor comprises a scattered light gathering-device, a control device and a Laser Driven, wherein, one end of described Laser Driven is connected with described scattered light gathering-device, the other end is connected with described control device, and described Laser Driven, in order to open the laser instrument in described scattered light gathering-device, makes described laser instrument Emission Lasers; Described scattered light gathering-device is in order to Emission Lasers and collect scattered light signal, and converts described scattered light signal to voltage pulse signal; Described control device in order to control described Laser Driven, and then regulates the power of laser.
2. sensor according to claim 1, it is characterized in that, described sensor also comprises a scavenger fan, described scavenger fan is connected with described control device, air in surveyed area is flowed and is in plateau, described control device by controlling the rotating speed of described scavenger fan, and then controls the speed air flow in described surveyed area.
3. sensor according to claim 2, it is characterized in that, described sensor also comprises a prime amplifier and an AD converter, described prime amplifier is connected with described scattered light gathering-device, in order to amplify described voltage pulse signal, described AD converter is connected with described prime amplifier, by amplify after described voltage pulse signal carry out analog to digital conversion, make change after signal identify by described control device.
4. sensor according to claim 1, is characterized in that, described scattered light gathering-device also comprises convex lens, a collimation lens, a photodiode and a light trapping; Wherein, described laser instrument is connected with described Laser Driven, in order to Emission Lasers; Described convex lens are connected with described laser instrument, make laser beam be compressed to a less focal spot; Described collimation lens is connected with described convex lens, in order to maintain the collimation of described laser beam; Described photodiode is positioned at immediately below the focal position of described laser beam generation, in order to detect the described voltage pulse signal that particle produces through described laser beam; Described light trapping is positioned at the working direction of described laser beam, in order to absorb described laser beam, stops it to enter described scattered light gathering-device, to meet the requirement of background noise.
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Cited By (8)
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| CN105259085A (en) * | 2015-10-20 | 2016-01-20 | 武汉三众和光电科技有限公司 | Dust concentration measurement system of laser dust sensor and dust concentration measurement method |
| CN105259086A (en) * | 2015-10-29 | 2016-01-20 | 广东美的制冷设备有限公司 | Detection method and system of dust concentration |
| CN105606772A (en) * | 2016-02-02 | 2016-05-25 | 连云港岚宝电子科技有限公司 | Portable air detection device and detection method |
| CN105891416A (en) * | 2016-03-31 | 2016-08-24 | 南京航空航天大学 | Ultrasonic assisting high-sensitivity detection system for pollutants in fluid and working method of ultrasonic assisting high-sensitivity detection system |
| CN106814015A (en) * | 2017-02-08 | 2017-06-09 | 深圳市赛纳威环境科技有限公司 | A kind of big flow particle concentration detects sensor-based system |
| CN107121364A (en) * | 2017-06-20 | 2017-09-01 | 兰州大学 | The multifunction measuring set that a kind of particle system influences on laser signal |
| CN107305177A (en) * | 2016-04-21 | 2017-10-31 | 易幼文 | A kind of particulate matter visualization device and portable particulate matter detecting system |
| CN109632589A (en) * | 2018-12-30 | 2019-04-16 | 江苏苏净集团有限公司 | A kind of Atmospheric particulates detection device and method |
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- 2015-03-31 CN CN201520192533.4U patent/CN204514760U/en active Active
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105259085A (en) * | 2015-10-20 | 2016-01-20 | 武汉三众和光电科技有限公司 | Dust concentration measurement system of laser dust sensor and dust concentration measurement method |
| CN105259085B (en) * | 2015-10-20 | 2018-03-02 | 武汉四方光电科技有限公司 | The powder concentration measurement system and its measuring method of a kind of laser dust sensor |
| CN105259086A (en) * | 2015-10-29 | 2016-01-20 | 广东美的制冷设备有限公司 | Detection method and system of dust concentration |
| CN105259086B (en) * | 2015-10-29 | 2018-03-27 | 广东美的制冷设备有限公司 | The detection method and detecting system of dust concentration |
| CN105606772A (en) * | 2016-02-02 | 2016-05-25 | 连云港岚宝电子科技有限公司 | Portable air detection device and detection method |
| CN105891416A (en) * | 2016-03-31 | 2016-08-24 | 南京航空航天大学 | Ultrasonic assisting high-sensitivity detection system for pollutants in fluid and working method of ultrasonic assisting high-sensitivity detection system |
| CN107305177A (en) * | 2016-04-21 | 2017-10-31 | 易幼文 | A kind of particulate matter visualization device and portable particulate matter detecting system |
| CN106814015A (en) * | 2017-02-08 | 2017-06-09 | 深圳市赛纳威环境科技有限公司 | A kind of big flow particle concentration detects sensor-based system |
| CN107121364A (en) * | 2017-06-20 | 2017-09-01 | 兰州大学 | The multifunction measuring set that a kind of particle system influences on laser signal |
| CN109632589A (en) * | 2018-12-30 | 2019-04-16 | 江苏苏净集团有限公司 | A kind of Atmospheric particulates detection device and method |
| CN109632589B (en) * | 2018-12-30 | 2024-03-12 | 江苏苏净集团有限公司 | Atmospheric particulate detection device and method |
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| CB03 | Change of inventor or designer information |
Inventor after: Zhang Jianshi Inventor after: Qu Jinglei Inventor before: Qu Jinglei Inventor before: Gu Mingqiang Inventor before: Zhang Jianshi |
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| COR | Change of bibliographic data |