CN117990568A - Cloud and fog particle backward scattering imaging integrated measuring device - Google Patents
Cloud and fog particle backward scattering imaging integrated measuring device Download PDFInfo
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Abstract
The invention discloses a cloud and fog particle back scattering imaging integrated measuring device, which comprises: the backward scattering imaging photoelectric system emits laser beams through a laser, and irradiates cloud and fog particles after collimation, and generated scattering signals are collected and recorded on a camera through the Fourier optical imaging system; the probe system comprises a head part, a transition section, a middle section and a tail part and is used for installing and fixing a backward scattering imaging photoelectric system. The cloud and fog particle back scattering imaging integrated measuring device provided by the invention can reduce the influence of an external flow field, improve the running stability and anti-interference performance of the device, realize the on-line measurement of cloud and fog particle parameters through a back scattering imaging technology in different industrial environments, and greatly enlarge the application range of the cloud and fog particle back scattering imaging integrated measuring device.
Description
Technical Field
The invention belongs to the field of gas-liquid two-phase flow measurement, and particularly relates to a cloud and mist particle back scattering imaging integrated measurement device.
Background
Icing of aircraft and engines has been an important potential safety hazard for aircraft flight, and supercooled water droplets and ice crystals are one of the important factors causing icing of aircraft and engines. Therefore, the airworthiness evidence collection test for the aircraft and the engine is very important, and whether the aircraft and the engine can cope with the icing problem caused by different cloud and fog fields in the flying process can be verified. The simulated cloud and fog field test is a key ring in airworthiness evidence collection, and measurement equipment is required to calibrate the simulated cloud and fog field in advance, in particular to a method and equipment for testing particle parameters such as supercooled water drops, ice crystals and the like. Most of the current testing instruments can analyze the liquid water content, the median volume diameter and other parameter changes of the cloud and fog field, and as disclosed in China patent CN116895039A discloses an icing cloud and fog pseudo-particle image identification and characteristic parameter measurement method, the icing cloud and fog pseudo-particle image identification and characteristic parameter measurement method has the characteristics that icing cloud and fog pseudo-particle images can be more effectively identified to realize more accurate measurement of icing cloud and fog characteristic parameters. However, more and more studies are beginning to focus on the measurement of the speed and temperature of particles, and in order to fully understand the kinetic and thermodynamic parameters of cloud and mist particles, there is currently less research related to this aspect, so that there is an urgent need for a suitable cloud and mist particle measuring instrument to help simulate the calibration and research of cloud and mist fields.
The optical measurement technology has the characteristic of non-contact remote online measurement and has been widely applied to measurement tests simulating cloud and fog fields. The back scattering imaging technology has unique advantages in the aspect of cloud and fog particle measurement, for example, the rainbow refraction measurement technology is a typical back scattering imaging technology, so that not only can the non-contact on-line simultaneous measurement of multiple parameters of droplet size and temperature be realized, but also the influence of laser emission and collection on a flow field on the same side is small. In recent years, a great deal of research has been attempted to use the back-scattering imaging technique, rainbow refraction measurement technique, for industrial measurement, helping to more fully explore particle motion characteristics and heat transfer processes. For example, chinese patent publication No. CN116818887a discloses a method for measuring the concentration of a particle two-phase flow to realize accurate measurement of the concentration of a particle phase in a particle two-phase flow to be measured.
Because the optical technology has high requirements on the working environment, such as vibration, moisture, emitted light of metal wall surfaces and the like, the reliability and the accuracy of the measurement of the optical technology can be affected, the application of the optical technology in complex and severe cloud and fog fields is very difficult, and the measurement test in a laboratory and the application in industrial scenes are very different. In order to ensure that the backscattering technology normally operates in a low-temperature and humid environment like an icing cloud and mist field, a probe protection light path needs to be designed, a system light path is integrated and optimized, a using method and data processing steps of the system are simplified, and synchronous test, acquisition, storage and processing are realized.
Disclosure of Invention
The invention aims to provide a cloud and fog particle back scattering imaging integrated measuring device, which reduces the influence of an external flow field, improves the running stability and anti-interference performance of the device, can realize the on-line measurement of cloud and fog particle parameters in different industrial environments by a back scattering imaging technology, and greatly increases the application range of the cloud and fog particle back scattering imaging integrated measuring device.
The technical scheme adopted by the invention is as follows:
a cloud particle backscatter imaging integrated measurement device, the device comprising:
the backward scattering imaging photoelectric system emits laser beams through a laser, and irradiates cloud and fog particles after collimation, and generated scattering signals are collected and recorded on a camera through a (spatially filtered) Fourier optical imaging system;
The probe system comprises a head part, a transition section, a middle section and a tail part and is used for installing and fixing a backward scattering imaging photoelectric system.
The backscatter imaging optoelectronic system includes:
The continuous laser emission unit comprises a laser, a reflecting mirror and a collimation system, and is used for generating an intensity-adjustable laser beam, adjusting the incidence position and incidence angle of the laser beam, irradiating cloud and fog particles and generating a scattering signal coincident with a main optical axis of the Fourier optical imaging unit;
The Fourier optical imaging unit comprises a collecting lens, an imaging lens and a camera, wherein the collecting lens collects scattered signals and records the scattered signals on the camera through the imaging lens.
The collecting lens collects scattered signals and then sequentially divides the scattered signals into two beams of signals through the reflecting mirror, the diaphragm, the imaging lens, the optical filter and the spectroscope, one beam of signals is imaged on the camera, and the other beam of signals is focused on the photoelectric detector through the focusing lens.
Further, in the backward scattering imaging photoelectric system provided by the invention, the following components are arranged in the following way: the continuous laser emission unit is used for generating a stable continuous laser beam with adjustable light intensity; the imaging system is used for collecting scattered signals of a measuring area by constructing a single-point filtering Fourier imaging system, avoiding signal, reflected light and stray light interference outside the measuring area and recording signals through camera imaging; wherein, each optical element of the back scattering imaging photoelectric system is directly fixed in the device, and the relative position can be finely adjusted; the laser emission direction and the signal direction are on the same side and on the same side of the device.
Furthermore, the head part is wedge-shaped, the transition section is gently connected with the head part and the middle section, the cross section of the middle section is of a waist-round structure, and the tail part is conical.
The probe system provided by the invention can protect the photoelectric element (backward scattering imaging photoelectric system) in the device and control the external flow field, can effectively fix the optical path system in the device, has good aerodynamic appearance, and can be directly fixed on a platform for high-speed test: the device is wholly long and narrow, the cross section is of a waist round structure, the head part is designed into a wedge shape, the tail part is contracted into a cone shape, the front edge of the base is an arc, and the joint of the base and the waist round structure is smooth in transition and has no obvious protrusion or depression; the influence of the external shape of the device on the original flow field is small, and the multiphase flow characteristics are hardly changed especially near the measuring area of the device; the transition section that each part of probe system is gently connected can reduce the possibility such as icing, contamination.
In the invention, the special structures, especially the head part, the tail part and the like of the windward side can effectively reduce the influence of the device on an external flow field, and improve the running stability and the anti-interference performance of the device.
The head is provided with a laser emission window and a signal collection window, the laser beam irradiates cloud and fog particles after passing through the laser emission window, and scattered signals are collected and recorded on the camera through the signal collection window by a spatially filtered Fourier optical imaging system; and a drainage groove is arranged in front of the laser emission window and the signal collection window.
Further, the windows required for the optical system, i.e. the laser emission window and the signal collection window, are located on the same side of the probe system and on the same plane.
The head is provided with an electric heating anti-icing device, and the electric heating anti-icing devices are arranged at the laser emission window and the signal collection window; the tail part is provided with an electric heating control element for controlling the electric heating anti-icing device.
The electric heating anti-icing device is regulated by a temperature control instrument, and the temperature control instrument controls the solid state relay according to the temperature measured by the thermocouple, so as to control the connection and disconnection of the electric heating anti-icing device.
The device comprises a base, wherein the front edge of the base is an arc; the base is connected with the middle section of the probe system through a sealing groove.
Furthermore, sealing rings are added at the joints of all parts of the probe system, the laser emission window and the signal collection window and the joints of the base and the probe system to further seal the device provided by the invention, so that the sealing grade of the device reaches IP65.
The probe system provided by the invention prevents the internal elements from being influenced by low-temperature high-speed humid environment through the protection modes of sealing, mechanical anti-icing, electric heating anti-icing device and the like, and ensures the normal operation of the optical system in a complex severe environment (ensures the stable operation of the photoelectric system). The mechanical anti-icing means that the head part is in a wedge-shaped structure, a window front drainage groove structure and a base front edge design part, and the possibility of icing is reduced through optimizing the mechanical structure. The electric heating anti-icing device is positioned at the positions of the head, the window, the laser and other electric elements, the total heating power is above 500w, and the phenomenon of icing on the surface of the device can not influence the accuracy of particle measurement when the device operates in a cloud and fog environment at the temperature of minus 20 ℃.
The cloud and fog particle back scattering imaging integrated measuring device provided by the invention stably operates at the wind speed of 150 m/s.
The apparatus includes a signal processing system for processing images recorded by a camera, comprising:
inverting the image to obtain the particle size and refractive index of the cloud and fog particle liquid drops;
obtaining particle temperature information according to the relation between the refractive index of the liquid drops and the temperature;
And outputting cloud particle measurement results including volume median diameter and particle temperature distribution according to the particle size and the particle temperature information of the liquid drops.
Wherein inversion is performed according to the following formula:
Wherein, I rb (theta) is the signal distribution of the rainbow image, I fit (theta) is the theoretical rainbow signal distribution, I N is the interference signal, theta is the scattering angle, n is the refractive index of the liquid drop, and d is the particle diameter of the liquid drop.
Compared with the prior art, the invention has the following excellent effects:
Aiming at a low-temperature high-speed cloud environment, the invention provides a cloud particle measuring device capable of stably operating based on a back scattering imaging technology, which is used for on-line exploration of the characteristics of a cloud gas-liquid two-phase flow field, analysis of the heat and mass transfer process of cloud particles through parameter change and real-time non-contact measurement of the characteristics of multiple parameters (particle size, distribution, refractive index, temperature and the like) of the cloud particles.
The device provided by the invention is a measuring device capable of measuring multiphase flow particles and multiple parameters in a complex and severe cloud and fog field, solves the problem that the optical measuring technology is difficult to apply in the severe environment of the cloud and fog field, realizes the real-time detection of the cloud and fog particles by a back scattering imaging measuring system, and has the characteristics of high integration level, strong anti-interference performance, suitability for industrial online application and the like; the particle characteristics of different areas of the cloud and fog field can be measured by not only measuring the parameter change of multiphase flow particles in real time, but also moving the position of the whole device.
Drawings
FIG. 1 is a schematic diagram of a cloud and fog particle back-scattering imaging measurement device;
FIG. 2 is a schematic view of the internal structure of a measuring device according to the present invention;
FIG. 3 is a front view of the overall structure of a measuring device provided by the invention;
FIG. 4 is a top view of the overall structure of a measuring device provided by the present invention;
FIG. 5 is a schematic diagram of an iridescent path system according to an embodiment;
Wherein, 1-probe system; 2-laser beam; 3-scattering signals; 4-head electric heating anti-icing device; 5-window electric heating anti-icing device; 6-backscatter imaging optoelectronic systems; 7-sealing grooves at the joints of the probes; 8-a photoelectric control device; 9-an electrical heating control element; 10-a base seal groove; 11-a base; 12-a power interface; 13-a laser emission window; 14-a signal collection window; 15-drainage grooves; 16-wedge head; 17-a probe transition section; 18-tail; 19-a laser; 20-a laser mirror; 21-a collection lens; 22-signal mirror; 23-diaphragm; 24-an imaging lens; 25-an optical filter; 26-spectroscope; 27-a camera; 28-a focusing lens; 29-a photodetector; 30-particles to be measured.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and detailed description, wherein it is to be understood that the various embodiments described below can be arbitrarily combined to form new embodiments without conflict, and it is to be understood that the described embodiments are merely some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention provides a cloud and fog particle back scattering imaging measurement device, which comprises a back scattering imaging photoelectric system 6 and a probe system 1, and specifically comprises the following components:
The backward scattering imaging photoelectric system 6 generates a continuous laser beam 2 through a laser 19, irradiates cloud and fog particles after adjustment, collects scattered signals 3 through a Fourier optical imaging system on the same side as the emitting laser after the particles generate scattered signals 3, images the scattered signals on a camera 27, records the scattered signals on a computer, and can obtain specific parameter information of the particles after processing.
The back-scattering imaging optoelectronic system 6 consists of a continuous laser emission unit and a fourier optical imaging unit: the continuous laser emitting unit comprises a laser 19, a laser mirror 20 and a collimation system, and is used for generating an intensity-adjustable laser beam 2 and adjusting the incidence position and incidence angle of the beam so that the direction of a scattering signal 3 generated by cloud particles passing through a measuring area coincides with the main optical axis of the Fourier optical imaging unit.
Wherein the fourier optical imaging unit comprises: the scattered signal 3 is collected by the collecting lens 21 and then divided into two beams of signals by the signal reflecting mirror 22, the diaphragm 23, the imaging lens 24, the optical filter 25 and the spectroscope 26 in sequence, one beam of signals is imaged on the camera 27, and the other beam of signals is focused on the photoelectric detector 29 by the focusing lens 28.
Wherein the laser 19 is a 0-3 w continuous laser with adjustable light intensity, and the laser 19 and the laser mirror 20 are directly fixed inside the probe system 1.
Wherein the lenses of the optical path system (collecting lens 21, imaging lens 24 and focusing lens 28) are all 25.4mm in diameter and the focal length is in the range of 25mm to 100 mm.
Wherein the resolution of the camera 27 is 2M to 20M, the highest frame rate is 50fps, the detection scattering angle range of the camera 27 is 20 degrees, the minimum resolution angle is 0.002 degrees, and the total length of the Fourier imaging optical path system is within 500 mm.
The backscatter imaging optoelectronic system 6 further includes an optoelectronic control device 8.
A probe system 1 for protecting the internal photocell and controlling external flow field variations, comprising a head 16, a transition section 17, a middle section and a tail 18; the head 16 is wedge-shaped, the middle section has a kidney-shaped cross section, and the tail 18 has a conical shape.
Specifically, the probe system 1 is seamless in a windward area, is integrally formed, adopts aviation duralumin 7075, and adopts a wedge-shaped head 16 in the windward structure, so as to reduce the influence of liquid drop impact on a measuring area. The device has smooth surface without obvious bending or protruding, and the transition section 17 is smooth so as to reduce surface icing.
Specifically, the head 16 is provided with a laser emission window 13 and a signal collection window 14, the laser beam 2 irradiates cloud and fog particles after passing through the laser emission window 13, and the scattered signal 3 is collected and recorded on the camera 27 by a spatially filtered Fourier optical imaging system through the signal collection window 14; a drainage groove 15 is arranged in front of the laser emission window 13 and the signal collection window 14; the head 16 is provided with a head electric heating anti-icing device 4, and window electric heating anti-icing devices 5 are arranged at the positions of the laser emission window 13 and the signal collection window 14; the tail 18 is provided with an electric heating control element 9 for controlling the head electric heating anti-icing device 4 and the window electric heating anti-icing device 5.
Specifically, the measuring device further comprises a base 11, and the front edge of the base 11 is an arc; the base 11 is connected with the middle section of the probe system 1 through the probe connection part sealing groove 7 and the base sealing groove 10.
The cloud and fog particle back scattering imaging integrated measuring device integrates the light path structure of the back scattering imaging technology, ensures the normal operation of a back scattering imaging photoelectric system 6, and reduces the light path volume by adding a reflecting mirror, adjusting the parameters of optical elements and the like. According to the layout and the volume of a light path system of a back scattering imaging technology, the probe system 1 of the device is designed, the back scattering photoelectric system 6 is directly fixed in a test area, the probe system 1 is compact and firm, the aerodynamic performance is good, the influence on a primary flow field is reduced, and meanwhile, the running stability of the device in a high wind speed environment is improved; the drainage groove 15 is arranged in front of the laser emission window 13 and the signal collection window 14, so that the phenomenon of liquid contamination window is reduced. The probe body is directly connected with the base 11, so that the stability and the anti-interference performance of the device are improved.
The probe system 1 ensures that the photoelectric element normally operates in a severe environment with low temperature and high speed and humidity while fixing the back scattering imaging optical path system 6 at a test section, and specifically comprises devices such as sealing protection, mechanical structure anti-icing, electric heating anti-icing, transportation protection and the like:
(1) Sealing and protecting: the sealing protection adopts a sealing ring and a sealing groove with corresponding specification, such as a sealing groove 7 at the joint of the probe and a base sealing groove 10; the joint of the protection device, the joint of the main body and the base 11 and the window area are sealed with IP65;
(2) The mechanical structure is anti-icing: the aerodynamic shape of the probe system 1 has small influence on the multiphase flow field, the head 16 serving as a windward side is of a wedge-shaped structure, the drainage groove 15 and the tail 18 in front of the laser emission window 13 and the signal collection window 14 are of conical shapes, and the mechanical mechanisms are beneficial to improving the accuracy of system measurement and the stability of device operation;
(3) Electrically heated anti-icing/temperature protection: the temperature, dryness and stability of the surrounding environment of the photoelectric element are maintained by measures such as the head electric heating anti-icing device 4 and the window electric heating anti-icing device 5; specifically, the electric heating anti-icing means that a temperature control instrument is adopted for adjustment, the instrument controls a solid state relay according to the temperature measured by a thermocouple, and then the connection and disconnection of the head electric heating anti-icing device 4 and the window electric heating anti-icing device 5 are controlled, so that the temperature protection of the head 16 of the windward side of the device, the laser emission window 13 and the signal collection window 14 is realized; the temperature of the heating area is controlled to be near a preset value by the temperature protection, and the heating area can be monitored remotely;
(4) Transportation protection: the transportation protection adopts the aviation case to protect, and inside designs the filler according to device shape and power control system shape, makes the filler shape laminate as far as possible, avoids the damage in the transportation.
The probe system 1 provided by the invention has less than 10% of influence on a flow field through cloud and fog field simulation verification.
The application method of the cloud and fog particle back scattering imaging integrated measuring device provided by the invention comprises the following steps:
a. The cloud and fog particle back scattering imaging measuring device is fixed in the test section, the communication wire and the power wire are connected with the power control system, the laser and the camera power supply switch are turned on after the power is connected, and the remote control is carried out by connecting the computer through the network cable.
B. and (5) remotely controlling and adjusting the laser intensity and the exposure time of the camera, opening a temperature control system, and checking whether the system operates normally.
C. and generating liquid drops at the measuring area by using a spray can, and checking whether the internal light path of the device runs normally or not.
D. And (3) turning on a heating switch, controlling the temperature of a key area by a temperature control system, then carrying out a cloud and fog field measurement test, finely adjusting the laser intensity and the exposure time of a camera, recording a scattered light signal, and storing the scattered light signal in a computer.
E. And processing the recorded images to obtain parameters such as particle diameter, refractive index and the like of particles, and carrying out statistics after batch processing to obtain related parameters such as cloud and fog field particle temperature, median volume diameter and the like.
Examples
The cloud and fog particle measuring device based on the rainbow refraction technology provided by the embodiment consists of a rainbow light path system (serving as a back scattering imaging photoelectric system 6), a signal processing system and a probe system 1.
The rainbow optical path system is shown in fig. 5, and comprises a 2.5W 532nm continuous laser 19, a laser mirror 20, a collection lens 21, a signal mirror 22, a 1mm pinhole 23, an imaging lens 24, 532nm narrow band filters 25, 50:50 spectroscope 26, industrial area camera 27 of net twine interface, photodetector 29 and focusing lens 28. The size of the collecting lens 21 and the imaging lens 24 are 25mm, and the focal length is 25mm and 50mm, respectively. The highest frame rate of camera 27 is 50fps and the resolution is 1M. The laser 19 emits laser beams, the laser beams irradiate cloud particles/liquid drops after passing through the signal reflecting mirror 20, and the included angle between the collection of the Fourier imaging unit and the incident laser is adjusted to be between 134 degrees and 145 degrees, so that the collection lens 21 can collect rainbow signals of the liquid drops, the collection lens 21, the imaging lens 24 and the camera 27 form a Fourier imaging system, and the same angle scattered light of the liquid drops at different positions in a measuring area is ensured to be imaged on the same pixel point of the camera 27. The position and the size of the diaphragm 23 are adjusted to control the position and the size of a measuring area, interference of ambient stray light and reflected light is eliminated, a rainbow signal is divided into two identical signals by the spectroscope 26 after passing through a Fourier imaging system, one signal is focused on the photoelectric detector 29 through the focusing lens 28, the other signal is directly imaged on the camera 27, and after the photoelectric detector 29 detects an effective rainbow signal, the camera 27 is controlled to record, so that the effectiveness of data acquisition can be improved.
The probe system as shown in fig. 1,3 and 4, the probe system 1 of the design device according to the integrated rainbow light path system has the total size of 700mm×200mm×100mm, the diameter of the laser emission window 13 is 12.5mm, the diameter of the signal acquisition window 14 is 25mm, the head 16 serving as a windward side is wedge-shaped, the slope angle is 30 degrees, and the influence of liquid drop impact on measurement is effectively reduced. The surface of the device is smooth, and no obvious bending or protruding exists. The aerodynamic shape of the probe system 1 of the device has been simulated to verify that the influence on the primary flow field is less than 10%. The base 11 of the device is provided with a threaded hole for fixing, a power supply wiring port and a communication wiring port, and is directly connected with a power supply control system. The threaded holes are rich in position, and the installation mode under different industrial environments can be adapted.
The protection system of the probe system 1 is shown in fig. 2, and the laser emission window 13, the signal collection window 14, the sealing groove 7 at the joint of the probe and the sealing groove 10 at the joint of the probe and the base are used for protecting the internal parts of the device by using a sealing ring with the thickness of 2.5 mm. The head 16 serving as a windward side, the laser emission window 13 and the signal collection window 14 are controlled by heating pipes, ceramic heating plates, the head electric heating anti-icing device 4 (such as a thermocouple) and the window electric heating anti-icing device 5 (such as a thermocouple), the total power is 800w, the temperature change of key areas inside the device is detected by a temperature control instrument, and a heating switch is controlled, so that the heating temperature is prevented from being too high. In addition, the aviation case is customized according to the shape of the probe of the device, the shape of the internal filler is attached to the shape of the device, and the internal light path structure of the device is prevented from being changed by collision and vibration in transportation.
The power supply of the device provided by the embodiment adopts two 24v direct current power supplies, the power is 1000w and 500w respectively, the power supplies are used for heating power supply and element power supply, an air switch is installed to prevent overload of a circuit, the power interface 12 is used for connecting a power supply line and a communication line of the device, and the two power interfaces are respectively connected with a 220v power supply and a remote control computer. The power control system converts RS232 signals, 485 signals and the like output by the device into network cable communication, and is coupled with a camera network cable to realize that one network cable is connected with a computer remote control device.
The rainbow signal acquired by the device provided by the embodiment is transmitted to the signal processing system through the power control system, the rainbow image is stored in the hard disk, and more than 500G exists in the storage, so that all images of a single test can be stored. The rainbow images are screened in advance by means of artificial intelligence, rainbow images which do not carry effective information are screened, and success rate and accuracy of signal inversion are improved. The rainbow image is inverted to obtain the particle size and refractive index of the liquid drops, and the inversion error is controlled within 5%. And obtaining the temperature information of the particles by means of the relation between the refractive index of the liquid drops and the temperature. And outputting statistics of cloud and fog particle measurement results after batch processing, outputting volume median diameter, particle temperature distribution and the like, and realizing online measurement of cloud and fog field particles.
In conclusion, the cloud and fog particle measuring device based on the back scattering imaging technology provided by the invention has the advantages of compact and firm structure and good aerodynamic performance, and can ensure that an internal system stably operates in a complex severe environment. The measuring device mainly comprises a backward scattering imaging photoelectric system and a probe system. Miniaturized back-scattering imaging optoelectronic systems are used to generate, collect and record scattering signals by irradiating particles with a laser beam. The probe system is used for protecting the internal elements of the device, controlling the external flow field, installing and fixing the photoelectric system, and ensuring the normal operation of the optical technology in a low-temperature high-speed humid environment through protection modes such as sealing, electric heating and the like. The invention provides an integrated measuring device of an optical system, which can realize the on-line measurement of cloud and fog particle parameters in different industrial environments by a back scattering imaging technology, and greatly increases the application range of the device.
Claims (10)
1. A cloud particle backscatter imaging integrated measurement device, the device comprising:
The backward scattering imaging photoelectric system emits laser beams through a laser, and irradiates cloud and fog particles after collimation, and generated scattering signals are collected and recorded on a camera through the Fourier optical imaging system;
The probe system comprises a head part, a transition section, a middle section and a tail part and is used for installing and fixing a backward scattering imaging photoelectric system.
2. The cloud particle backscatter imaging integrated measurement device of claim 1, wherein the backscatter imaging optoelectronic system comprises:
The continuous laser emission unit comprises a laser, a reflecting mirror and a collimation system, and is used for generating an intensity-adjustable laser beam, adjusting the incidence position and incidence angle of the laser beam, irradiating cloud and fog particles and generating a scattering signal coincident with a main optical axis of the Fourier optical imaging unit;
The Fourier optical imaging unit comprises a collecting lens, an imaging lens and a camera, wherein the collecting lens collects scattered signals and records the scattered signals on the camera through the imaging lens.
3. The integrated measurement device for cloud and fog particle backscattering imaging according to claim 2, wherein the collecting lens collects scattered signals and then sequentially divides the scattered signals into two beams of signals through a reflecting mirror, a diaphragm, an imaging lens, an optical filter and a spectroscope, one beam of signals is imaged on a camera, and the other beam of signals is focused on a photoelectric detector through a focusing lens.
4. The cloud particle backscattering imaging integrated measurement device according to claim 1, wherein the head is wedge-shaped, the transition section is gently connected with the head and the middle section, the cross section of the middle section is of a waist-round structure, and the tail is conical.
5. The integrated measurement device for cloud and mist particle back scattering imaging according to claim 1, wherein a laser emission window and a signal collection window are arranged on the head, the cloud and mist particles are irradiated after the laser beam passes through the laser emission window, and scattered signals are collected and recorded on the camera through the signal collection window by a spatially filtered fourier optical imaging system.
6. The cloud particle backscatter imaging integrated measurement device of claim 5, wherein the laser emission window and signal collection window are located on the same side of the probe system and on the same plane; and a drainage groove is arranged in front of the laser emission window and the signal collection window.
7. The cloud particle back scattering imaging integrated measurement device of claim 5, wherein the head is provided with an electric heating anti-icing device, and the laser emission window and the signal collection window are both provided with electric heating anti-icing devices; the tail part is provided with an electric heating control element for controlling the electric heating anti-icing device.
8. The cloud particle backscattering imaging integrated measurement device of claim 7, wherein the electrically heated anti-icing device is regulated by a temperature control instrument, and the temperature control instrument controls the solid state relay according to the temperature measured by the thermocouple, so as to control the connection and disconnection of the electrically heated anti-icing device.
9. The cloud particle back-scattering imaging integrated measurement device of claim 1, wherein the device comprises a base, the front edge of the base is an arc; the base is connected with the middle section through the sealing groove.
10. The cloud particle backscatter imaging integrated measurement device of claim 1, comprising a signal processing system for processing images recorded by a camera, comprising:
inverting the image to obtain the particle size and refractive index of the cloud and fog particle liquid drops;
obtaining particle temperature information according to the relation between the refractive index of the liquid drops and the temperature;
And outputting cloud particle measurement results including volume median diameter and particle temperature distribution according to the particle size and the particle temperature information of the liquid drops.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410155836.2A CN117990568A (en) | 2024-02-04 | 2024-02-04 | Cloud and fog particle backward scattering imaging integrated measuring device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410155836.2A CN117990568A (en) | 2024-02-04 | 2024-02-04 | Cloud and fog particle backward scattering imaging integrated measuring device |
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| CN117990568A true CN117990568A (en) | 2024-05-07 |
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| CN202410155836.2A Pending CN117990568A (en) | 2024-02-04 | 2024-02-04 | Cloud and fog particle backward scattering imaging integrated measuring device |
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| Country | Link |
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| CN (1) | CN117990568A (en) |
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