CN210090251U

CN210090251U - High-altitude particle identification device based on microscopic amplification and visual angle sensing

Info

Publication number: CN210090251U
Application number: CN201920728261.3U
Authority: CN
Inventors: 文斌; 李娜; 卢德全; 贺南
Original assignee: Chengdu Chen Hao Technology Co Ltd; Chengdu University of Information Technology
Current assignee: Chengdu Chen Hao Technology Co Ltd; Chengdu University of Information Technology
Priority date: 2019-05-17
Filing date: 2019-05-17
Publication date: 2020-02-18
Anticipated expiration: 2029-05-17

Abstract

The utility model discloses a high-altitude particle identification device based on microscopic amplification and visual angle sensing, which comprises a laser irradiation unit, a microscopic unit and a signal acquisition unit; the microscopic unit is specifically as follows: an objective lens, a prism, a lens barrel, an ocular lens and an image sensing module are sequentially connected; the left end and the right end of the prism are provided with triangular prisms; the laser irradiation is specifically: laser generated by the laser diode is irradiated to the particle cavity through the lens, and the light absorption component is arranged and used for absorbing stray light of the laser after the action of the particles; scattered light generated by the laser irradiation on the particles is further analyzed after being amplified by the microscopic unit to obtain the morphological characteristics of the particles. And the signal acquisition unit transmits the particle image information to the cloud data management center through the Lora communication module. The utility model discloses the device just is small, easily carry, is used for high altitude particle to survey, and the observation result is accurate.

Description

High-altitude particle identification device based on microscopic amplification and visual angle sensing

Technical Field

The utility model relates to a high altitude particle detection technology field, especially a high altitude particle identification device based on microscopic magnification and visual angle sensing.

Background

Currently, the accuracy and accuracy of particle detection, whether domestic or foreign, is continually increasing as the size and price of the equipment increases. The principle and method of particle measurement on the ground or in low-altitude are well developed, but the method of particle measurement is simpler and the accuracy and precision thereof are greatly reduced in the small-volume, low-power consumption and low-cost household purifier market. Due to cost and volume requirements, the measurement results are only statistical results, not metering results.

Meanwhile, the haze greatly influences the health, life and trip of urban people, qualitative research is lacked in the high-altitude haze cause, and no metering device capable of accurately measuring the properties and sizes of high-altitude particles exists at present. In addition, the size of the particles in the high altitude is below PM2.5, and the existing particle collecting device can not be used for detecting the particles in the high altitude under PM2.5, so that a particle collecting device based on microscopy and video images needs to be researched, the particles in the high altitude can be further qualitatively and quantitatively detected, the motion rule of the PM2.5 particles in the high altitude in cities is controlled, and the forming mechanism of the haze in the cities is researched.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that a high altitude particle identification device based on microscopic magnification and visual angle sensing is provided, whole device just small, easily carry, be used for high altitude particle to survey, and the observation result is accurate.

In order to solve the technical problem, the utility model discloses a technical scheme is:

the utility model provides a high altitude particle recognition device based on microscopic magnification and visual angle sensing, includes laser irradiation unit, microscopic unit and signal acquisition unit, wherein:

the laser irradiation unit is specifically: laser generated by the laser diode is irradiated on the particle cavity through the lens; a light absorption component is arranged and used for absorbing the stray light of the laser after the action of the particles; scattered light generated by irradiating the particles with the laser is further analyzed after being amplified by a microscopic unit to obtain morphological characteristics of the particles;

the microscopic unit is specifically as follows: an objective lens, a prism, a lens barrel, an ocular lens and an image sensing module are sequentially connected; the left end and the right end of the prism are respectively provided with a triangular prism, so that an optical signal is received from the objective lens and then reflected to the other triangular prism through one triangular prism, and finally the optical signal output by the prism is transmitted to the eyepiece;

the signal acquisition unit specifically is: the particle detection module consists of a photoelectric detection circuit and an amplification circuit which are sequentially connected; the image sensing module consists of a CCD information acquisition circuit, a filter circuit and an AD conversion circuit which are sequentially connected, and an output signal of the image sensing module is transmitted to the raspberry group; the raspberry group is further connected with a Lora communication module, and the Lora communication module is used for sending collected information to a cloud data management center and receiving a control command of the cloud data management center.

Furthermore, the raspberry group is also connected with a storage module, and the storage module stores the collected picture information.

Further, the raspberry pi comprises a USB interface connected to the image sensing module and an ethernet controller, and the model of the ethernet controller is LAN 9512.

Further, the raspberry pi chip in the raspberry pi is BCM 2835.

Compared with the prior art, the beneficial effects of the utility model are that: the whole microscope unit has the characteristics of small volume, easy carrying, accurate observed value and the like, the lens cone of the microscope is partially changed, the volume is reduced, and the image transmitted by the objective lens can be completely seen by utilizing the reflection principle of the triangular prism; by adjusting the focal length, clear and complete particle images can be obtained, so that observation and counting are facilitated.

Drawings

FIG. 1 is a high altitude atmospheric particle detection implementation principle;

FIG. 2 is a structural diagram of a middle microscope unit of the present invention;

FIG. 3 is a schematic diagram of a laser irradiation unit according to the present invention;

FIG. 4 is a graph of the variation of particle smear length versus particle motion rate;

FIG. 5 is a graph showing the variation of the length of the smear of the particles in relation to the exposure time of the camera;

FIG. 6 is a graph of the variation of width and smoothness of a particulate smear as a function of particulate morphology;

fig. 7 is a circuit diagram of a signal acquisition unit in the present invention;

FIG. 8 is a flow chart of the high altitude collection of the present invention;

FIG. 9 is a flow chart of the ground data analysis of the present invention;

fig. 10 is a schematic view of the overall flow of the present invention.

In the figure: 1-a laser irradiation unit; 2-a microparticle cavity; 3-an objective lens; 4-a prism; 5-a lens barrel; 6-ocular lens; 7-an image sensing module; 8-a laser diode; 9-a lens; 10-laser; 11-a light absorbing member; 12-particles (microparticles); 13-microscopic Unit.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

The particle detection device is mainly used at high altitude (about 1-7 kilometers), the high altitude environment is very severe relative to the ground environment, the high altitude temperature is low, the humidity is high, the wind speed is too high and other factors, the used particle sensor has the characteristics of low cost, difficult recovery and the like, and the particle sensor with high manufacturing cost cannot be used in the environment. In order to guarantee that can accurate specific particle and the particle concentration who exists in the high altitude of acquisition, the utility model discloses a micro-camera combines laser technology, in addition timing device, carries out fixed point at each rise and detects, and the particle image information storage that will acquire is in the raspberry group. The collected information is stored to the cloud end through the Lora communication module, managers visit a cloud data management center to obtain information such as pictures and the like, the information is analyzed and processed at the ground end, the obtained result is combined with weather process information and atmospheric environment information to obtain an early warning and forecasting algorithm model of haze, and the implementation principle of the early warning and forecasting algorithm model is shown in fig. 1.

The whole device adopts a microscopic camera shooting technology combining a raspberry pie and a microscope. And after the camera is matched with the microscope, transmitting the acquired particle image information to the raspberry pie and storing the information in the raspberry pie. However, the traditional microscope observation device has large volume and is inconvenient to carry, and the microscope observation device cannot be carried to high altitude for microscope observation.

As shown in FIG. 2, the microscope unit 13 of the present invention is disposed on the lens barrel 5, the structure of the lens barrel 5 after being changed is only about 2cm, and the whole microscope unit 13 has the characteristics of small volume, easy carrying, accurate observation value, etc. The utility model discloses change lens cone 5, reduce the volume, can place whole part in little box completely. By utilizing the reflection principle of the triangular prism, the image transmitted by the objective lens can be completely seen, the focus is adjusted, and clear and complete particle images can be obtained, so that the observation and counting are facilitated.

As shown in fig. 3, the laser irradiation unit 1 is composed of a laser diode 8, a lens 9, and a light absorbing member 11. Laser light 10 emitted from the laser diode 8 is condensed by the lens 9 and then passes through the microparticle cavity 2, the generated stray light is absorbed by the surrounding light absorption member 11, and the scattered light generated by irradiating the microparticles with the laser light is amplified by the microscopic device 13 and then further analyzed to obtain the morphological characteristics of the microparticles.

The device shoots a clearly amplified particle image, and more accurate data is obtained through image processing, so the amplification factor and the precision of the acquisition device directly influence the accuracy of an experimental result. Adopting microscopic amplification design to amplify the particle signal, adopting image analysis method, combining camera exposure rate and particle movement rateAnd the reflection of the characteristics such as particle size on the image, and the size and the nature of the particles are distinguished. For the same particle, different wind speeds and exposure times can affect the length of the particle smear; for different particles, the size of the particle size of the particles directly affects the width of the particle smear and the smoothness of the surface under the same conditions of wind speed and exposure time. So the length (P) of the particle smear_L) Width (P)_W) And smoothness (P)_S) And the velocity (V) of particle movement_P) There is a direct relationship between camera exposure time (t) and particle morphology.

As shown in fig. 4, when the same kind of particles pass through the particle chamber 2, the exposure time of the camera is fixed, and only the magnitude of the wind speed is changed. When the wind speed is gradually increased, the length of the particle smear is also increased, and then the length of the particle smear is in direct proportion to the movement speed of the particles, namely P_L∝V_P。

As shown in fig. 5, when the same kind of particles pass through the particle chamber 2, the size of the wind speed is fixed, and only the exposure time of the camera is changed. When the exposure time of the camera is gradually prolonged, the length of the particle smear is shortened, and the length of the particle smear and the exposure time of the camera are in inverse proportion, namely P_L∝(1/t)。

In summary, if the moving speed of the shot particles is faster, a clear image can be obtained by slightly increasing the exposure rate of the camera. If the movement speed of the particles is not fast, the exposure rate of the camera cannot be too long. That is, the movement speed of the particles is faster and faster, and the exposure time of the camera is gradually lengthened.

As shown in fig. 6, when different kinds of smooth-surfaced particles pass through the particle chamber 2, the widths of the 1 st particle shadow and the 2 nd particle shadow are obviously different by fixing the wind speed and the exposure time of the camera. When particles having a non-smooth surface are used, a state such as the light shadow of the No. 3 particle occurs, i.e., the smoothness of the smear of the particles depends only on the flat state of the particles themselves.

Defining the particle width from left to right as a_iEach scale is a from bottom to top in vertical height_j. Then the width P of the particle smear_WThe relationship between the width W of the fine particles and the height H of the fine particles is as follows:

wherein W is max (a)_i)-min(a_i)，H＝max(a_j)-min(a_j) (ii) a I.e. when the particles are elongated, P_WMin, and vice versa.

As shown in fig. 7, the utility model discloses among the information acquisition unit, it mainly comprises electrical unit, particle detection module, image sensing module 7, raspberry group, storage module, Lora communication module. The power supply unit completes the 12V power supply conversion and power supply functions; the particle detection module is mainly used for detecting and analyzing particles which move rapidly in the particle cavity 2, and the image sensing module 7 is used for shooting and collecting images; the raspberry pie is a control center of the whole information acquisition unit, and the information acquisition and transmission are controlled by the raspberry pie; the storage module is used for storing the acquired picture information and is connected with the Lora communication module through a BCM2815 chip; the Lora communication module sends the acquired particle image information to the cloud data management center and receives a control command of the cloud data management center.

Claims

1. The high-altitude particle identification device based on microscopic amplification and visual angle sensing is characterized by comprising a laser irradiation unit (1), a microscopic unit (13) and a signal acquisition unit, wherein:

the laser irradiation unit (1) is specifically: laser (10) generated by a laser diode (8) irradiates the particle cavity (2) through a lens (9); a light absorption component (11) is arranged, and the light absorption component (11) is used for absorbing stray light of the laser (10) after being acted by particles; scattered light generated by irradiating the particles with the laser is amplified by a microscopic unit (13) and then is further analyzed to obtain morphological characteristics of the particles;

the microscopic unit (13) is specifically: an objective lens (3) is arranged on one side of the particle cavity (2), and the objective lens (3), the prism (4), the lens cone (5), the ocular lens (6) and the image sensing module (7) are sequentially connected; the left end and the right end of the prism (4) are respectively provided with a triangular prism, so that an optical signal is received from the objective lens (3) and then reflected to the other triangular prism through one triangular prism, and finally the optical signal output by the prism (4) is transmitted to the eyepiece (6);

the signal acquisition unit specifically is: the particle detection device comprises a particle detection module, an image sensing module (7) and a raspberry pie, wherein the particle detection module consists of a photoelectric detection circuit and an amplification circuit which are sequentially connected; the image sensing module (7) consists of a CCD information acquisition circuit, a filter circuit and an AD conversion circuit which are sequentially connected, and an output signal of the image sensing module (7) is transmitted to the raspberry group; the raspberry group is further connected with a Lora communication module, and the Lora communication module is used for sending collected information to a cloud data management center and receiving a control command of the cloud data management center.

2. The high-altitude particle recognition device based on microscopic magnification and visual angle sensing as claimed in claim 1, wherein the raspberry pi is further connected with a storage module, and the storage module stores the acquired picture information.

3. The high-altitude particle recognition device based on microscopic magnification and visual angle sensing as claimed in claim 1, wherein the raspberry pi comprises a USB interface connected with an image sensing module (7) and an ethernet controller, and the model of the ethernet controller is LAN 9512.

4. The high altitude particle identification device based on microscopic magnification and visual angle sensing as claimed in claim 1, wherein the raspberry pi chip in the raspberry pi is BCM 2835.