A sampling belt and a real-time monitoring device for droplet concentration

Abstract

The application relates to a sample belt and a real-time monitoring device for aerosol concentration, wherein the sample belt comprises a belt body for adsorbing aerosols, a driving mechanism for releasing and winding the sample belt, and the two ends of the belt body are connected with the sample belt releasing end and the sample belt winding end of the driving mechanism respectively; the real-time monitoring device for aerosol concentration comprises a laser, a first converging lens, a second converging lens, a CCD photosensitive array, a processor, an air pump for air extraction, a display device and the above sample belt, a sample cavity is arranged between the first converging lens and the second converging lens, the air inlet of the sample cavity is communicated with external air, the air outlet of the sample cavity is connected with the air pump, a monitoring cavity is arranged in the middle of the sample cavity, the sample belt is arranged between the monitoring cavity and the air outlet, and the display device is connected with the processor. Based on the sample belt and the real-time monitoring device for aerosol concentration, real-time sample collection and real-time monitoring of the aerosol concentration can be realized.

Description

Technical Field

[0001] The invention belongs to the field of environmental monitoring, and in particular relates to a sample belt and a real-time monitoring device for droplet concentration. Background Art

[0002] Droplets are airborne liquid particles with diameters in the micrometer range. Droplets are typically produced through respiration by humans and animals. Normal human interaction, such as coughing, sneezing, and talking, generates large quantities of droplets. Droplets are widely present in public environments such as supermarkets, restaurants, and public transportation. In other crowded settings, such as hospitals and nursing homes, invasive respiratory procedures, such as suctioning, bronchoscopy, intubation, turning, back massage, and cardiopulmonary resuscitation, also generate large quantities of droplets. Droplets can travel a distance to penetrate the mucous membranes of susceptible individuals. While most droplets are large and do not remain suspended in the air for long periods, they can attach to common surfaces, creating a pathway for viral transmission. Susceptible individuals who come into contact with surfaces where droplets accumulate significantly increase their likelihood of infection. To control the spread of infectious diseases, real-time monitoring and sampling of droplet concentrations and their components is essential. This is especially important in special circumstances or during unusual times, when real-time monitoring of droplet concentrations and viral components allows for timely disinfection of surfaces in public places. Summary of the Invention

[0003] The technical problem solved by the present invention is to provide a sample belt and a real-time monitoring device for droplet concentration, so as to solve the problem in the prior art of lack of real-time monitoring of droplet concentration and real-time sampling of droplet components in public environments.

[0004] The specific solution provided by the present invention includes the following steps:

[0005] The present invention provides a sample belt, comprising: a belt body for absorbing droplets, a driving mechanism for releasing the sample belt and rewinding the sample belt, wherein the two ends of the belt body are respectively connected to the sample belt releasing end and the sample rewinding end of the driving mechanism.

[0006] Therefore, under the action of the driving mechanism, the two ends of the sample belt are released and reeled respectively, driving the belt to move continuously. While the belt moves, it absorbs droplets to achieve real-time sample collection.

[0007] On the basis of the above scheme, the present invention can also be improved as follows:

[0008] Furthermore, the belt body includes a hydrophilic layer and a hydrophobic layer, one side of the hydrophilic layer serves as a sample retaining surface, and the other side of the hydrophilic layer is provided with the hydrophobic layer.

[0009] Therefore, the hydrophilic layer facilitates the retention of droplet samples, and the hydrophobic layer can prevent droplets from adhering to both sides of the belt, thereby preventing droplets from adhering to the belt body and causing cross contamination of samples.

[0010] Furthermore, the hydrophilic layer is a paper-based layer, and the hydrophobic layer is selected from any one of a polypropylene layer, a polyethylene layer, and a polyvinyl fluoride layer.

[0011] Specifically, the paper base layer is made of cotton test paper and is a narrow strip. The non-sample retaining surface of the paper base layer is coated with the polypropylene layer, polyethylene layer or polyvinyl fluoride layer.

[0012] Optionally, the sample retention belt has only one hydrophobic layer, and a plurality of sampling points are provided on the hydrophobic layer. The sampling points are adhered to the surface of the hydrophobic layer, and the sampling points are made of hydrophilic material.

[0013] Furthermore, the driving mechanism includes a first rotating shaft and a second rotating shaft arranged in parallel and a driving device for driving the first rotating shaft and the second rotating shaft to rotate in the same direction, and the two ends of the belt body are respectively wound on the first rotating shaft and the second rotating shaft.

[0014] Thus, the driving device drives the first rotating shaft and the second rotating shaft to rotate in the same direction, thereby driving the sample belt body to move.

[0015] Furthermore, it also includes a shell, the first rotating shaft and the second rotating shaft are respectively arranged in the shell, the driving device includes a motor and a transmission assembly, the first rotating shaft is rotatably connected to the shell, the second rotating shaft is fixed on the output shaft of the motor, and the first rotating shaft and the second rotating shaft are transmission-connected through the transmission assembly.

[0016] Thus, the two ends of the sample tape are respectively wound on the first rotating shaft and the second rotating shaft, and thus wound inside the shell, thereby reducing external pollution.

[0017] Furthermore, the transmission assembly includes a first gear provided on the first rotating shaft, a second gear provided on the second rotating shaft, and a synchronous belt, and the first gear and the second gear are connected by the synchronous belt.

[0018] Specifically, the shell is a box structure similar to a tape cassette, and a through hole is provided on the box body, which penetrates the box body, so that the sample surface can be used to sample droplet liquid particles in the air.

[0019] Furthermore, the belt body is provided with scales.

[0020] Therefore, while rotating and sampling, the sampling time can be recorded in real time in combination with the speed of the belt releasing and winding.

[0021] The present invention also provides a real-time monitoring device for droplet concentration, comprising: a laser, a first converging lens, a second converging lens, a CCD photosensitive array, a processor, an air pump for exhausting air, a display device, and the sample belt as described above, wherein a sample cavity is provided between the first converging lens and the second converging lens, the air inlet of the sample cavity is connected to the external air, the air outlet of the sample cavity is connected to the air pump, a monitoring cavity is provided in the middle of the sample cavity, and the sample belt is passed between the monitoring cavity and the air outlet; the display device is connected to the processor respectively; the light emitted by the laser is converged by the first converging lens and incident on the monitoring cavity, and then converged by the second converging lens and received by the CCD photosensitive array, the CCD photosensitive array converts the received light intensity information into light intensity data and sends it to the processor; the processor receives the light intensity data, and processes the diffraction light intensity data that meets the diffraction of droplet liquid particles and its corresponding detection time and air pump flow to obtain the droplet concentration in the air at each moment, and sends the droplet concentration to the display device.

[0022] The specific detection principle and beneficial effects of the technical solution of the present invention are as follows:

[0023] 1) Diffraction refers to the physical phenomenon that waves deviate from their original straight-line propagation when encountering an obstacle. When light encounters an opaque or transparent obstacle or a small hole (slit) in its propagation path, it deviates from the straight-line propagation by bypassing the obstacle. This phenomenon is called diffraction of light. Any obstacle can cause light to diffract, but the conditions for obvious diffraction are "harsh". When the wavelength of light is much smaller than the hole or obstacle, the light can be seen as propagating in a straight line. When the hole or obstacle is comparable to the wavelength, or even smaller than the wavelength, diffraction is very obvious. Since the wavelength range of visible light is 4x10 -7 m to 7.7x10 -7 Because the wavelength of light is very short, diffraction is difficult to detect in daily life. However, since the diameter of droplet liquid particles is at the micron level, and the wavelength of laser light is generally at the sub-micron level, the two sizes are comparable, which means that droplets will produce a diffraction effect on the laser light, and the size of the diffraction pattern is directly related to the size of the droplet liquid particles. This is the principle that the CCD light intensity distribution can be used as a droplet particle size monitoring, thus achieving real-time monitoring of droplet liquid particle size.

[0024] 2) The air containing droplets needs to enter the monitoring chamber to be monitored. There are basically two ways for the air to enter the monitoring chamber. One is free diffusion, that is, the air is not guided and is allowed to freely disturb. A part of the air passes through the monitoring chamber, and the particle size and number of the droplet liquid particles therein are monitored. In this way, gravity is generally used. Gravity will have an attraction to the droplets, so the droplets will tend to move towards the surface. The monitoring chamber is transparent from top to bottom. Most of the air containing droplets enters the monitoring chamber from the upper opening and exits from the lower opening. This free diffusion method is easy to implement, low in cost, and reliable in structure, but it is easily affected by other air flows. Based on the structure of the present invention, an air pump that guides the air flow is set behind the monitoring chamber. The air pump drives the air and the droplets in the air to flow through the monitoring chamber, which can reduce the interference of external air flow.

[0025] 3) The processor calculates the particle size of the droplet liquid particles based on the droplet diffraction image, records the detection time and counts it, so that it can be known that within a specific detection time period, the particle size distribution of the droplet liquid particles in the specific volume of air flowing through the sample cavity (i.e., the particle size distribution of the droplet liquid particles in the air) can be obtained by integration. The total volume V1 of the droplets in the air during the detection time period can be obtained based on the total volume V1 of the droplets during the detection time period and the volume V of the specific air flowing through the sample cavity to obtain the droplet concentration in the air (V1 / V). Based on the droplet concentration real-time monitoring device of the present invention, the droplet concentration in public environments / places can be monitored in real time. By setting various warning values, it is possible to provide targeted reminders of the need for disinfection of public environments and cut off the main route of droplet transmission.

[0026] 4) Under the action of the air pump, the air containing droplet liquid particles coming out of the detection chamber passes through the sample belt, and the droplet liquid particles are adsorbed on the surface of the rotating sample belt, realizing the real-time collection of droplet samples so that virus detection can be carried out when needed.

[0027] Furthermore, the processor includes an acquisition module, a screening module and a calculation module, the acquisition module is used to obtain the flow of the air pump and send it to the calculation module; the screening module is used to receive the light intensity data sent by the CCD photosensitive array, and screen the light intensity data to obtain diffraction light intensity data that meets the diffraction of droplet liquid particles, and finally send the diffraction light intensity data and its corresponding detection time to the calculation module; the calculation module obtains the particle size data of the droplet liquid particles based on the received diffraction light intensity data, and then obtains the particle size distribution of the droplet liquid particles per unit time based on the detection time and particle size data statistics, calculates the droplet concentration at each moment based on the particle size distribution and the air pump flow, and sends the particle size distribution and droplet concentration of the droplet liquid particles per unit time to the display device.

[0028] The specific principle is that the CCD photosensitive array usually contains several CCD sensitive units. When there is no diffraction, a light intensity signal can be detected at a specific position (specific CCD sensitive unit). After diffraction occurs, a light intensity signal will be detected in the CCD photosensitive array outside the specific CCD sensitive unit, so that we can know whether diffraction has occurred. The size of the diffraction spot can be known through the position of the light intensity on the CCD photosensitive array, the diffraction image or the diffraction intensity data containing the position information of the CCD sensitive unit, which corresponds to the size of the droplets. Therefore, after receiving the light intensity data sent by the CCD photosensitive array, the screening module determines whether the light intensity data is the diffraction intensity data of the droplet liquid particles according to the CCD sensitive unit position information carried by the light intensity data, and screens out the diffraction intensity data that meets the conditions, and finally sends the diffraction intensity data and its corresponding detection time to the calculation module.

[0029] Specifically, the calculation module includes a particle size calculation module and a denoising module. The particle size calculation module obtains the particle size data of the droplet liquid particles based on the received diffraction light intensity data of the droplet liquid particles, and then sends it to the denoising module; the denoising module is used to receive the particle size data, retain the particle size data with a particle size ≥3mm, and then statistically calculate the retained particle size data and its corresponding detection time to obtain the particle size distribution of the droplet liquid particles per unit time, calculate the droplet concentration at each moment based on the particle size distribution and the air pump flow rate, and send the particle size distribution and droplet concentration of the droplet liquid particles per unit time to the display device.

[0030] The dust in the air is mostly distributed in the range of 0.2-2.8 microns, and the particle size of human droplet liquid particles is 0.1-10um. Adding a denoising unit can remove the interference of most dust particles and improve the accuracy of monitoring. Of course, it is also possible not to add a denoising unit, because the dust content in the air is usually fixed, and its impact on the droplet liquid concentration is usually fixed. Therefore, the measured droplet liquid concentration containing dust particles can also reflect the droplet concentration in the environment to a certain extent.

[0031] Specifically, after a period of use, the atomizer can be used to generate droplet liquid particles with a known radius range, and then the particle size test can be performed on the droplet liquid particles to calibrate the particle size of the droplet liquid particles.

[0032] Specifically, the air pump in the device can use a fixed flow rate, which is used as a fixed flow value of the calculation module to participate in the calculation; the air pump can use a variable flow rate, that is, the volume V of air entering the sample chamber can be adjusted as needed, and the flow value of the acquisition module needs to be changed accordingly.

[0033] Specifically, the air pump is a common device on the market, and its main function is to guide the flow of air.

[0034] Preferably, a commercially available air pump with low vibration, low noise, low energy consumption and small size is selected.

[0035] Preferably, the belt body is provided with through holes penetrating the hydrophilic layer and the hydrophobic layer, so as to facilitate rapid gas circulation and reduce resistance when pumping air.

[0036] Specifically, the processor adopts an ARM system or other systems. The ARM system provides a rich interface, which is very convenient for the intelligentization and networking of the droplet monitoring system.

[0037] Specifically, the display device is selected from any one of a mobile phone, an iPad or an LED display screen.

[0038] Specifically, the processor is connected to the mobile phone and iPad via wireless communication.

[0039] Specifically, the processor is connected to the LED display screen via a wire, so that the screen can be connected when the customer needs to operate directly in order to save energy and reduce volume.

[0040] Preferably, the display device is a mobile phone, which serves as a mobile client to facilitate viewing of data. After the mobile phone and the processor are connected, the mobile phone serves as the interactive end of the system, and various operations such as setting, viewing, and file transfer can be conveniently performed.

[0041] Furthermore, the CCD photosensitive array includes a CCD photosensitive array unit and an AD conversion unit. The CCD photosensitive array unit converts the received light intensity information into an electrical signal. The AD conversion unit obtains the electrical signal and converts the electrical signal into light intensity data and sends it to the processor.

[0042] Specifically, the CCD photosensitive array is composed of many photosensitive units, usually in millions of pixels. When the CCD surface is exposed to light, each photosensitive unit will reflect the charge on the component. The signals generated by all the photosensitive units are added together to form a complete picture.

[0043] Specifically, the AD conversion unit uses a 16-bit or 24-bit AD conversion chip to perform AD conversion on the light intensity information input by one or more semiconductor laser detectors, convert the light intensity information electrical signal into a digital signal, and upload it to the processor of the system host through the interface.

[0044] Alternatively, the AD conversion unit in the processor can be used to convert electrical signals into digital signals. Typically, the processor in the system host already has an AD conversion interface. In this case, the AD conversion function provided by the processor can be directly used, which in turn reduces system energy consumption, reduces costs, and simplifies the structure.

[0045] Specifically, the CCD photosensitive array is a CCD image sensor. The CCD image sensor is a charge-coupled device image sensor. It is made of a highly sensitive semiconductor material and can convert light into electric charge. It is converted into a digital signal through an analog-to-digital converter chip. The digital signal is compressed and stored in the flash memory or built-in hard disk card inside the camera. Therefore, the data can be easily transmitted to the computer, and with the help of computer processing means, it is determined whether the detected sample diffraction image is a droplet diffraction image. When the droplet diffraction image is taken, the liquid particle size of the droplets is calculated based on the droplet diffraction image, and the detection time is recorded and recorded, so that the particle size distribution of the droplets in a specific volume of air flowing through the sample cavity within a specific detection time period can be known. The total volume V1 of the droplet liquid particles in the air within the detection time period can be obtained by integration. According to the droplets within the detection time period, the total volume V1 of the droplet liquid particles in the air can be obtained by integration. The total volume V1 and the volume V of the air flowing through the sample chamber are used to obtain the droplet concentration (V1 / V), so that the concentration of droplets in public environments / places can be monitored in real time. By setting various warning values, targeted reminders of the need for disinfection of public environments can be given, and the main routes of droplet transmission can be cut off. Large-diameter droplets will quickly settle down on the surface of objects due to gravity. Therefore, the number of large-particle droplets in the detection environment can be used to measure the amount of droplets accumulated on the surface of objects in the monitoring environment. At the same time, since some droplets will carry static electricity, if the concentration of droplets in the air is too high, they will also adhere to the surface of opposite charges, and thus quickly accumulate on the surface of objects. The concentration of droplets in public environments / places can also be used to measure the amount of droplets accumulated on the surface of objects in the monitoring environment. Therefore, by setting large-particle droplet warning values ​​and / or droplet concentration warning values ​​and issuing early warnings, the surface of objects can be disinfected and scrubbed in a timely manner.

[0046] The real-time monitoring device for droplet concentration based on the present invention can realize real-time monitoring of droplet concentration, which is particularly beneficial for real-time monitoring of the number of droplets in hospitals, supermarkets and public transportation; the device based on the present invention can predict the accumulated amount on the surface of objects in the detection environment, thereby giving targeted reminders on the need for disinfection of public environments and cutting off the main routes of droplet transmission.

[0047] The real-time monitoring device for droplet concentration based on the present invention can realize real-time monitoring of droplet concentration, which is particularly beneficial for real-time monitoring of the number of droplets in hospitals, supermarkets and public transportation; the device based on the present invention can predict the accumulated amount on the surface of objects in the detection environment, thereby giving targeted reminders on the need for disinfection of public environments and cutting off the main routes of droplet transmission.

[0048] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 It is a schematic diagram of the main structure of the sample tape according to an embodiment of the present invention.

[0050] Figure 2 Schematic diagram of the structure of the belt body according to an embodiment of the present invention.

[0051] Figure 3 It is a schematic diagram of a top view of the structure according to an embodiment of the present invention.

[0052] Figure 4 Schematic diagram of the internal structure of the sample belt according to an embodiment of the present invention.

[0053] Figure 5 It is a structural schematic diagram of the real-time monitoring device for droplet concentration based on the present invention.

[0054] Figure 6 The figure is a principle block diagram of the real-time monitoring device for droplet concentration according to the present invention.

[0055] Attachment Figure 1-6 , the components represented by the reference numerals are as follows:

[0056] Belt body 1; hydrophilic layer 11; hydrophobic layer 12; through hole 13;

[0057] Driving mechanism 2; first rotating shaft 21; second rotating shaft 22; motor 23; synchronous belt 24;

[0058] Shell 3;

[0059] Laser 4;

[0060] a first converging lens 5;

[0061] a second converging lens 6;

[0062] CCD photosensitive array 7;

[0063] Air pump 8;

[0064] Sample chamber 9; air inlet 91; air outlet 92; monitoring chamber 93. DETAILED DESCRIPTION

[0065] The following describes embodiments of the present invention in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and are not to be construed as limiting the present invention.

[0066] Combined with attachment Figure 1-5 The present invention is described with reference to specific embodiments.

[0067] like Figure 1As shown, the sample belt according to the present invention includes: a belt body 1 for absorbing droplets, and a driving mechanism for releasing and rewinding the sample belt. The two ends of the belt body 1 are respectively connected to the sample belt release end and the sample rewinding end of the driving mechanism 2. Under the action of the driving mechanism, the two ends of the sample belt body are released and rewound respectively, driving the belt body to move continuously. The belt body absorbs droplets while moving, realizing real-time sample collection.

[0068] like Figure 2 As shown, according to an embodiment of the present invention, the sample retention tape, the tape body 1 includes a hydrophilic layer 11 and a hydrophobic layer 12. One side of the hydrophilic layer 11 serves as the sample retention surface, and the other side of the hydrophilic layer 11 is provided with the hydrophobic layer 12. The hydrophilic layer facilitates droplet sample retention, while the hydrophobic layer prevents droplet adhesion, preventing droplets from adhering to both sides of the tape body and causing cross contamination of the sample.

[0069] Based on the sample retention tape of the embodiment of the present invention, the hydrophilic layer 11 is a paper-based layer, and the hydrophobic layer 12 is selected from any one of a polypropylene layer, a polyethylene layer, and a polyvinyl fluoride layer.

[0070] Specifically, the paper base layer is made of cotton test paper and is a narrow strip. The non-sample retaining surface of the paper base layer is coated with the polypropylene layer, polyethylene layer or polyvinyl fluoride layer.

[0071] Optionally, the sample retention belt has only one hydrophobic layer, and a plurality of sampling points are provided on the hydrophobic layer. The sampling points are adhered to the surface of the hydrophobic layer, and the sampling points are made of hydrophilic material.

[0072] like Figure 1 and Figure 4 As shown, based on the sample belt of an embodiment of the present invention, the driving mechanism 2 includes a first rotating shaft 21 and a second rotating shaft 22 arranged in parallel and a driving device for driving the first rotating shaft 21 and the second rotating shaft 22 to rotate in the same direction, and the two ends of the belt body 1 are respectively wound on the first rotating shaft 21 and the second rotating shaft 22.

[0073] Thus, the driving device drives the first rotating shaft and the second rotating shaft to rotate in the same direction, thereby driving the sample belt body to move.

[0074] like Figure 3 As shown, the sample tape according to an embodiment of the present invention further includes a housing 3, with the first rotating shaft 21 and the second rotating shaft 22 respectively disposed within the housing 3. The drive device includes a motor 23 and a transmission assembly. The first rotating shaft 21 is rotationally connected to the housing 3, and the second rotating shaft 22 is fixed to the output shaft of the motor 23. The first rotating shaft 21 and the second rotating shaft 22 are transmission-connected via the transmission assembly. Thus, the sample tape is wound around the first rotating shaft and the second rotating shaft, respectively, and thus wound within the housing, reducing external contamination.

[0075] like Figure 1 As shown, based on the sample belt of an embodiment of the present invention, the transmission assembly includes a first gear arranged on the first rotating shaft 21, a second gear arranged on the second rotating shaft 22 and a synchronous belt 24, and the first gear and the second gear are connected by the synchronous belt 24.

[0076] Specifically, such as Figure 3 As shown, the shell is a box structure similar to a tape cassette, and a through hole 13 is provided on the box body, which runs through the box body to facilitate sampling of droplet liquid particles in the air by the sample retention surface.

[0077] Furthermore, a scale is provided on the belt 1. While rotating and sampling, the sampling time can be recorded in real time in combination with the speed of releasing and rewinding the belt.

[0078] like Figure 5 and 6 As shown, based on the real-time monitoring device for droplet concentration of the present invention, a laser 4, a first converging lens 5, a second converging lens 6, a CCD photosensitive array 7, a processor, an air pump 8 for exhausting air, a display device and the sample belt 1 as described above, a sample cavity 9 is provided between the first converging lens and the second converging lens, an air inlet 91 of the sample cavity 9 is communicated with the outside air, an air outlet 92 of the sample cavity 9 is connected to the air pump 8, a monitoring cavity 93 is provided in the middle of the sample cavity 9, and the sample belt 1 is passed between the monitoring cavity 93 and the air outlet 92; The display devices are respectively connected to the processors; the light emitted by the laser is converged by the first converging lens and incident into the monitoring cavity, and then converged by the second converging lens and received by the CCD photosensitive array. The CCD photosensitive array converts the received light intensity information into light intensity data and sends it to the processor; the processor receives the light intensity data, and processes the diffraction light intensity data that meets the diffraction of droplet liquid particles and its corresponding detection time and air pump flow to obtain the droplet concentration in the air at each moment, and sends the droplet concentration to the display device.

[0079] The real-time monitoring device for droplet concentration of the present invention can monitor the droplet concentration in public environments / places in real time. By setting various warning values, targeted reminders of the need for disinfection of the public environment can be given, thereby cutting off the main routes of droplet transmission. Under the action of the air pump, the air containing droplet liquid particles coming out of the detection chamber passes through the sample belt, and the droplet liquid particles are adsorbed on the surface of the rotating sample belt, thereby realizing real-time collection of droplet samples so that virus detection can be performed when needed.

[0080] like Figure 6As shown, based on the real-time monitoring device for droplet concentration in an embodiment of the present invention, the processor includes an acquisition module, a screening module and a calculation module, the acquisition module is used to obtain the flow rate of the air pump and send it to the calculation module; the screening module is used to receive the light intensity data sent by the CCD photosensitive array, and screen the light intensity data to obtain diffraction light intensity data that meets the diffraction of droplet liquid particles, and finally send the diffraction light intensity data and its corresponding detection time to the calculation module; the calculation module obtains the particle size data of the droplet liquid particles based on the received diffraction light intensity data, and then obtains the particle size distribution of the droplet liquid particles per unit time based on the detection time and particle size data statistics, calculates the droplet concentration at each moment based on the particle size distribution and the air pump flow rate, and sends the particle size distribution and droplet concentration of the droplet liquid particles per unit time to the display device. Specifically, after receiving the light intensity data sent by the CCD photosensitivity array, the screening module determines whether the light intensity data is the diffraction intensity data of the droplet liquid particles based on the CCD sensitive unit position information carried by the light intensity data, and screens out the diffraction intensity data that meets the conditions, and finally sends the screened diffraction intensity data and its corresponding detection time to the calculation module.

[0081] Based on the real-time monitoring device for droplet concentration in an embodiment of the present invention, the calculation module includes a particle size calculation module and a denoising module. The particle size calculation module obtains the particle size data of the droplet liquid particles based on the received diffraction light intensity data of the droplet liquid particles, and then sends it to the denoising module; the denoising module is used to receive the particle size data, retain the particle size data with a particle size ≥3 mm, and then statistically calculate the retained particle size data and its corresponding detection time to obtain the particle size distribution of the droplet liquid particles per unit time, calculate the droplet concentration at each moment based on the particle size distribution and the air pump flow rate, and send the particle size distribution and droplet concentration of the droplet liquid particles per unit time to the display device. The dust in the air is mostly distributed in the range of 0.2-2.8 microns, and the particle size of human droplet liquid particles is 0.1-10um. Adding a denoising unit can remove the interference of most dust particles and improve the accuracy of monitoring. Of course, it is also possible not to add a denoising unit, because the dust content in the air is usually fixed, and its impact on the droplet liquid concentration is usually fixed. Therefore, the measured droplet liquid concentration containing dust particles can also reflect the droplet concentration in the environment to a certain extent.

[0082] Based on the real-time monitoring device for droplet concentration in the embodiment of the present invention, the air pump in the device can adopt a fixed flow rate, which is used as a fixed flow value of the calculation module to participate in the calculation; the air pump can adopt a variable flow rate, that is, the volume V of air entering the sample chamber can be adjusted as needed, and the flow value of the acquisition module needs to be changed accordingly.

[0083] In the real-time monitoring device for droplet concentration according to the embodiment of the present invention, the air pump is a common device on the market, and its main function is to guide the flow of air. A commercially available air pump with low vibration, low noise, low energy consumption, and small size is selected.

[0084] In the real-time monitoring device for droplet concentration according to the embodiment of the present invention, the belt body is provided with through holes penetrating the hydrophilic layer and the hydrophobic layer, so as to facilitate rapid gas circulation and reduce resistance during air extraction.

[0085] In the real-time monitoring device for droplet concentration according to the embodiment of the present invention, the processor adopts an ARM system or other systems. The ARM system provides a rich interface, which is very convenient for the intelligentization and networking of the droplet monitoring system.

[0086] Based on the real-time monitoring device for droplet concentration in an embodiment of the present invention, the display device is selected from any one of a mobile phone, an iPad, or an LED display screen. The processor is connected to the mobile phone or iPad by wireless communication. The processor is connected to the LED display screen by wire. Preferably, the display device is a mobile phone, which serves as a mobile client to facilitate data viewing. After the mobile phone and the processor are connected in communication, the mobile phone serves as the interactive end of the system, and various settings, viewing, file transfer, and other operations can be conveniently performed.

[0087] Based on the real-time droplet concentration monitoring device of the present invention, the CCD photosensitive array module includes a CCD photosensitive array unit and an AD conversion unit. The CCD photosensitive array unit converts the received light intensity information into an electrical signal. The AD conversion unit acquires the electrical signal and converts it into light intensity data, which is then sent to the processor. The CCD photosensitive array is composed of many photosensitive units, usually measured in megapixels. When the CCD surface is exposed to light, each photosensitive unit reflects an electric charge on the component. The signals generated by all photosensitive units are added together to form a complete image. The AD conversion unit uses a 16-bit or 24-bit AD conversion chip to perform AD conversion on the light intensity information input by one or more semiconductor laser detectors, converting the light intensity information electrical signal into a digital signal, which is then uploaded to the system host processor via an interface. Optionally, the AD conversion unit in the processor can be directly used to convert the electrical signal into a digital signal. The processor of the typical system host already has an AD conversion interface. In this case, the AD conversion function provided by the processor can be directly used, which in turn reduces system energy consumption, reduces costs, and has a simpler structure.

[0088] In the real-time monitoring device for droplet concentration of the present invention, the CCD photosensitive array is a CCD image sensor.

[0089] The real-time monitoring device for droplet concentration based on the present invention can realize real-time monitoring of droplet concentration, which is particularly beneficial for real-time monitoring of the number of droplets in hospitals, supermarkets and public transportation; the device based on the present invention can predict the accumulated amount on the surface of objects in the detection environment, thereby giving targeted reminders on the need for disinfection of public environments and cutting off the main routes of droplet transmission.

[0090] The specific monitoring process of droplet liquid particles is as follows:

[0091] Step 1: Turn on the instrument, the air pump starts working, extracting air near the air inlet, and the air flows into the monitoring chamber from the air inlet of the sample chamber;

[0092] Step 2: The laser light is focused by the first converging lens and incident on the droplet liquid particles in the monitoring cavity, causing diffraction. The diffracted light is then focused by the second converging lens and received by the CCD sensor.

[0093] Step 4: The CCD image sensor converts the intensity information of the received diffracted light into light intensity data and sends it to the processor. The processor receives the light intensity data and processes it to obtain a droplet diffraction image. The processor also processes the droplet particle diffraction image and its corresponding detection time and air pump flow rate to obtain the droplet concentration at each moment.

[0094] Step 4: The air containing droplets flows out from the monitoring cavity, passes through the sample belt, the droplets are adsorbed by the sample belt, and the air flows out from the air outlet of the sample cavity.

[0095] Although the embodiments of the present invention have been described in detail above, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and purpose of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A sample tape, characterized in that: include: A belt body (1) for absorbing droplets, a driving mechanism (2) for releasing the sample belt and rewinding the sample belt, wherein both ends of the belt body (1) are respectively connected to the sample belt releasing end and the sample belt rewinding end of the driving mechanism (2); The belt body (1) comprises a hydrophilic layer (11) and a hydrophobic layer (12), one side of the hydrophilic layer (11) serves as a sample retention surface, and the other side of the hydrophilic layer (11) is provided with the hydrophobic layer (12); The driving mechanism (2) comprises a first rotating shaft (21) and a second rotating shaft (22) arranged in parallel, and a driving device for driving the first rotating shaft (21) and the second rotating shaft (22) to rotate in the same direction, and the two ends of the belt body (1) are respectively wound on the first rotating shaft (21) and the second rotating shaft (22); The invention also includes a housing (3), wherein the first rotating shaft (21) and the second rotating shaft (22) are respectively arranged in the housing (3), and the driving device includes a motor (23) and a transmission assembly, wherein the first rotating shaft (21) is rotationally connected to the housing (3), and the second rotating shaft (22) is fixed to the output shaft of the motor (23), and the first rotating shaft (21) and the second rotating shaft (22) are transmission-connected via the transmission assembly.

2. The sample tape according to claim 1, wherein: The hydrophilic layer (11) is a paper-based layer, and the hydrophobic layer (12) is selected from any one of a polypropylene layer, a polyethylene layer, and a polyvinyl fluoride layer.

3. The sample tape according to claim 1, characterized in that: The transmission assembly comprises a first gear arranged on the first rotating shaft (21), a second gear arranged on the second rotating shaft (22), and a synchronous belt (24); the first gear and the second gear are connected in transmission via the synchronous belt (24).

4. The sample tape according to claim 1, wherein: The belt body (1) is provided with scales.

5. A real-time monitoring device for droplet concentration, characterized in that: include: A laser (4), a first converging lens (5), a second converging lens (6), a CCD photosensitive array (7), a processor, an air pump (8) for exhausting air, a display device, and a sample tape as described in any one of claims 1 to 4, wherein a sample cavity (9) is provided between the first converging lens (5) and the second converging lens (6), an air inlet (91) of the sample cavity (9) is connected to the external air, an air outlet (92) of the sample cavity (9) is connected to the air pump (8), a monitoring cavity (93) is provided in the middle of the sample cavity (9), and the sample tape is provided between the monitoring cavity (93) and the air outlet (92). ; The display devices are respectively connected to the processors; the light emitted by the laser (4) is converged by the first converging lens (5) and then incident on the monitoring cavity (93), and then converged by the second converging lens (6) and received by the CCD photosensitive array (7), and the CCD photosensitive array (7) converts the received light intensity information into light intensity data and sends it to the processor; the processor receives the light intensity data, and processes the diffraction light intensity data that meets the diffraction of droplet liquid particles and its corresponding detection time and air pump flow to obtain the droplet concentration in the air at each moment, and sends the droplet concentration to the display device.

6. The real-time monitoring device for droplet concentration according to claim 5, characterized in that: The processor comprises an acquisition module, a screening module and a calculation module, wherein the acquisition module is used to acquire the flow rate of the air pump (8) and send it to the calculation module; the screening module is used to receive the light intensity data sent by the CCD photosensitive array (7), and screen the light intensity data to obtain diffraction light intensity data that meets the diffraction of droplet liquid particles, and finally send the diffraction light intensity data and its corresponding detection time to the calculation module; The calculation module obtains the particle size data of the droplet liquid particles based on the received diffraction light intensity data, and then obtains the particle size distribution of the droplet liquid particles per unit time based on the detection time and the particle size data statistics, obtains the droplet concentration at each moment based on the particle size distribution and the flow rate of the air pump (8), and sends the particle size distribution and droplet concentration of the droplet liquid particles per unit time to the display device.

7. The real-time monitoring device for droplet concentration according to claim 5, characterized in that: The CCD photosensitive array (7) comprises a CCD photosensitive array unit and an AD conversion unit. The CCD photosensitive array unit converts received light intensity information into an electrical signal. The AD conversion unit acquires the electrical signal and converts the electrical signal into light intensity data and sends it to the processor.

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