CN114307443A - Empty gas detection surveys structure, air filter equipment and filtration equipment - Google Patents
Empty gas detection surveys structure, air filter equipment and filtration equipment Download PDFInfo
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- CN114307443A CN114307443A CN202111678068.1A CN202111678068A CN114307443A CN 114307443 A CN114307443 A CN 114307443A CN 202111678068 A CN202111678068 A CN 202111678068A CN 114307443 A CN114307443 A CN 114307443A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/42—Auxiliary equipment or operation thereof
- B01D46/44—Auxiliary equipment or operation thereof controlling filtration
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/88—Replacing filter elements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
- G01N21/64—Fluorescence; Phosphorescence
Abstract
The invention discloses an air detection structure, an air filtering device and air filtering equipment, and relates to the field of medical treatment. The structure comprises an air flow channel for air circulation, a laser light source, a fluorescent filter, a fluorescent receiver and a signal conversion circuit, wherein the laser light source, the fluorescent filter and the fluorescent receiver are positioned in the air flow channel. The laser light source excites biological particles in the air flow channel to generate scattered light and fluorescence, and the fluorescence filter reflects the scattered light and can be transmitted by the fluorescence. The fluorescence receiver converts the fluorescence into a target current signal, and the signal conversion circuit converts the target current signal into a target voltage signal, so that the signal processing system can determine the number of the biological particles according to the voltage value of the target voltage signal after acquiring the target voltage signal. The concentration and the quantity of the biological particles can be accurately measured, scientific and rigorous basis is provided for replacing the filtering device, and therefore the air quality is monitored in real time.
Description
Technical Field
The invention relates to the technical field of air filtration, in particular to an air detection structure, an air filtration device and air filtration equipment.
Background
Currently, due to environmental changes, the quality of air in a given space is increasingly valued by user groups, such as installing air filtration devices in a room to filter the air. However, replacement of air filter devices is currently on the market, either by time or by simple stress parameter assessment, such as pressure, flow rate, etc.
Since the above method has no strict data basis, it often happens that the filtering device is out of order before the filtering device is replaced, and the air quality cannot be guaranteed.
Disclosure of Invention
The present invention has been made in view of the above problems, and aims to provide an air detection structure, an air filter device, and an air filter apparatus that overcome or at least partially solve the above problems.
According to a first aspect of the present invention, the present invention provides an air detection structure, including an air flow channel for air circulation, a laser light source, a fluorescence filter, a fluorescence receiver, and a signal conversion circuit, where the laser light source, the fluorescence filter, and the fluorescence receiver are located in the air flow channel, and the fluorescence filter and the laser light source are oppositely disposed on two sides of the air flow channel; wherein the content of the first and second substances,
the laser light source excites biological particles in the air flow channel to generate scattered light and fluorescence, the fluorescence filter reflects the scattered light, and the fluorescence filter can be transmitted by the fluorescence;
the fluorescence receiver converts the fluorescence which penetrates through the fluorescence filter into a target current signal, and the signal conversion circuit converts the target current signal into a target voltage signal, so that after the signal processing system collects the target voltage signal, the number of the biological particles is determined according to the voltage value of the target voltage signal.
Optionally, the fluorescence receiver is a photomultiplier tube or an enhanced photodiode.
Optionally, the signal conversion circuit comprises an operational amplifier, a compensation capacitor and a gain resistor; wherein the content of the first and second substances,
the output end of the fluorescent receiver is used as the signal input end of the signal conversion circuit, and the cathode of the fluorescent receiver, one end of the compensation capacitor and one end of the gain resistor are respectively coupled to form a first node;
the anode of the fluorescent receiver and the positive phase input end of the operational amplifier are both grounded, and the other end of the compensation capacitor, the other end of the gain resistor and the output end of the operational amplifier are coupled at the same time and coupled to form a second node, wherein the second node is used as the signal output end of the signal conversion circuit, so that a signal processing system is coupled with the signal output end to acquire the target voltage signal.
Optionally, the signal conversion circuit further comprises a filter unit coupled to a cathode of the fluorescence receiver, the filter unit comprising a filter resistor and a filter capacitor;
the filter resistor is connected with the fluorescent receiver in parallel, and the filter capacitor is coupled between the cathode of the fluorescent receiver and the negative phase output end of the operational amplifier.
Optionally, the filter resistance is a metal film resistance.
Optionally, the filter capacitor is a ceramic capacitor.
Optionally, the structure further includes a scattering optical filter and a scattering receiver located in the air flow channel, where the scattering optical filter and the laser light source are oppositely disposed on two sides of the air flow channel; wherein the content of the first and second substances,
the laser light source excites dust particles in the air flow channel to generate scattered light, and the scattered light filter can be transmitted by the scattered light;
and the scattering receiver converts the scattered light which penetrates through the scattered light optical filter into a scattering voltage signal, so that after a signal processing system collects the scattering voltage signal, the quantity of the dust particles is determined according to the voltage value of the scattering voltage signal.
According to a second aspect of the present invention, there is provided an air filtration device comprising an air detection arrangement as described in any one of the above.
According to a third aspect of the present invention, there is provided an air filtration apparatus comprising the air filtration device mentioned above.
Compared with the prior art, the air flow channel for air circulation, the laser light source, the fluorescent filter, the fluorescent receiver and the signal conversion circuit are included, the laser light source, the fluorescent filter and the fluorescent receiver are located in the air flow channel, and the fluorescent filter and the laser light source are oppositely arranged on two sides of the air flow channel. The laser light source can excite biological particles in the air flow channel to generate scattered light and fluorescence, the fluorescent filter reflects the scattered light, and then the fluorescent filter can be penetrated by the fluorescence. The fluorescence receiver converts the fluorescence which penetrates through the fluorescence filter into a target current signal, and the signal conversion circuit converts the target current signal into a target voltage signal, so that after the signal processing system collects the target voltage signal, the number of the biological particles is determined according to the voltage value of the target voltage signal. Therefore, the concentration and the quantity of the biological particles can be accurately measured, scientific and rigorous bases are provided for replacing the filtering device, and the air quality can be monitored in real time.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings.
In the drawings:
FIG. 1 is a schematic structural diagram of an air detection structure according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a signal conversion circuit according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of another signal conversion circuit according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of another air detection structure provided in an embodiment of the present invention;
FIG. 5 is a schematic structural diagram of an air filtration apparatus according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a ventilator according to an embodiment of the present invention.
Reference numerals: 1. an air flow passage; 2. a laser light source; 3. a fluorescent filter; 4. a fluorescence receiver; 5. a signal conversion circuit; 501. an operational amplifier; 502. a compensation capacitor; 503. a feedback gain resistance; 504. a filter resistor; 505. a filter capacitor; 6. a scattered light filter; 7. a scatter receiver; 8. a signal processing system; 9. and (4) a filtering structure.
Detailed Description
Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
Referring to fig. 1 to 4, an air detection structure according to an embodiment of the present invention may include an air flow channel 1 for air to flow through, a laser light source 2, a fluorescence filter 3, a fluorescence receiver 4, and a signal conversion circuit 5. The laser light source 2, the fluorescent filter 3 and the fluorescent receiver 4 are located in the air flow channel 1, and the fluorescent filter 3 and the laser light source 2 are oppositely arranged on two sides of the air flow channel 1. The light source direction of the laser light source 2 faces the air flow channel 1, and is used for irradiating the air flowing in the air flow channel 1. The laser light source 2 excites the biological particles in the air flow channel 1 to generate scattered light and fluorescence. Specifically, when biological particles in the air pass through the region of the air flow channel 1 between the laser light source 2 and the fluorescence filter 3, the laser light source 2 is blocked from generating light pulses. The fluorescence filter 3 is used for separating the scattered light from the fluorescence. For example, the fluorescent filter 3 may reflect the scattered light, and the fluorescent filter 3 may transmit the fluorescent light. In one example, the fluorescence filter 3 may be a dichroic filter, and may have a reflectance of about 90% for scattered light and a transmittance of more than 95% for fluorescence. The scattered light and the fluorescence can be well separated.
The fluorescence receiver 4 receives the fluorescence transmitted through the fluorescence filter 3, and then converts the fluorescence into a target current signal, wherein the target current information is a pulse signal. Preferably, since the fluorescence signal of the biological particles is weak, the target current signal can be converted into a target voltage signal with a larger value by the signal conversion circuit 5, wherein the target voltage information is also a pulse signal. The target voltage signal may be collected by a target voltage collecting unit in the signal processing system 8, so that after the signal processing system 8 collects the target voltage signal, the number of the biological particles is determined according to a voltage value of the target voltage signal. For example, the pulse voltage signal may be counted or counted in a unit time. Thereby, the concentration and the amount of the biological particles can be accurately measured. Meanwhile, a voltage threshold value can be correspondingly set, when the concentration and the number of the biological particles exceed the voltage threshold value, the biological indexes in the air in the current air flow channel 1 are determined to be in an overproof state, and audible and visual alarm can be carried out, so that a user is reminded to replace the filtering structure 9 for filtering the air in time. The invention provides scientific and rigorous basis for replacing the filtering structure 9, thereby being capable of monitoring the air quality in real time.
In an alternative embodiment of the invention, the fluorescence receiver 4 is a photomultiplier or an enhanced photodiode, and the fluorescence receiver 4 can convert a very weak optical signal into an electrical signal, so that the accuracy of calculating the concentration and the number of the biological particles can be improved, and the performance of the product can be optimized.
In an alternative embodiment of the invention, referring to fig. 2, the signal conversion circuit 5 includes an operational amplifier 501, a compensation capacitor 502 and a gain resistor 503. The cathode of the fluorescent receiver 4 is used as the signal input terminal of the signal conversion circuit 5, and the cathode of the fluorescent receiver 4, one end of the compensation capacitor 502 and one end of the gain resistor 503 are respectively coupled to form a first node a. The anode of the fluorescent receiver 4 and the non-inverting input terminal of the operational amplifier 501 are both grounded, and the other end of the compensation capacitor 502, the other end of the gain resistor 503 and the output terminal of the operational amplifier 501 are coupled at the same time and form a second node B, where the second node B is used as the signal output terminal of the signal conversion circuit 5, so that the signal processing system 8 is coupled with the signal output terminal to collect the target voltage signal.
The calculation formula of the voltage V0 at the output terminal of the operational amplifier 501 is as follows:
V0＝IPMT×RFformula (1)
Wherein, IPMTIs the cathode current, R, of the fluorescent receiver 4FThe gain resistor 503 is used to amplify the pulse current generated by the fluorescence receiver 4, and the resistance value is the corresponding amplification factor. In view of signal amplification, the larger the gain resistor 503 is, the larger the voltage signal generated at the second node B is. From the viewpoint of signal bandwidth, the smaller the gain resistor 503 is, the higher the pulse frequency generated by the second node B is. Thus, the resistance of the gain resistor 503 is limited according to the response of the compensation capacitor 502 and the operational amplifier 501. In order to convert a weak target current signal into a larger voltage signal, a maximum resistance value corresponding to the gain resistor 503 may be determined based on the response limit of the compensation capacitor 502 and the response limit of the operational amplifier 501, and the maximum resistance value may be used as the value of the gain resistor 503. In one example, the response frequency f of the gain resistor 503FThe calculation formula of (a) is as follows:
the response frequency f of the operational amplifier 501-3dBThe calculation formula of (a) is as follows:
wherein, CPMTIs parasitic capacitance in the fluorescent receiver 4, and the capacitance value of the parasitic capacitance is determined according to the device characteristics of the fluorescent receiver 4; cSIs the sum of the compensation capacitance 502 and the input capacitance within the operational amplifier 501. The resistance value of the gain resistor 503 is determined by equation (3). Wherein the value of the compensation capacitor 502 is negligible. For example, f may be selected when the signal frequency is 300 KHz-3dBIs 400 KHz. When the amplifier GBW is 210MHz and Cs is 20pF, the gain resistance R can be obtainedFIs 10.4 M.OMEGA. The compensation capacitor 502, the parasitic capacitor in the fluorescence receiver 4, and the input capacitor in the operational amplifier 501 together adjust the phase of the target voltage signal, and form a low-pass filter circuit together with the gain resistor 503, where the response frequency obtained by the above formula (3) is the cut-off frequency of the low-pass filter. The signal to noise ratio can be improved, and therefore the product performance of the air detection structure is optimized.
In an alternative embodiment, referring to fig. 3, the signal conversion circuit 5 further includes a filter unit coupled to the cathode of the fluorescence receiver 4, the filter unit includes a filter resistor 504 and a filter capacitor 505, the filter capacitor 505 is connected in series with the fluorescence receiver 4, and the filter resistor 504 is connected in parallel with the fluorescence receiver 4. Specifically, the filter resistor 504 is configured to provide a static operating point for the fluorescent receiver 4, when weak background light is received by the fluorescent receiver 4, the dc voltage at the first node a may be slowly increased, and the filter resistor 504 may discharge the slowly increased dc voltage, thereby ensuring that the fluorescent receiver 4 has a stable static operating point. The filter capacitor 505 functions to isolate the direct current, so that only the pulse current signal generated by the biological particles can pass through, thereby improving the signal-to-noise ratio. Thereby, the filtering unit can make the pulse signal of the light pulse converted into the current pulse more obvious by eliminating the background noise. The method is favorable for further improving the calculation accuracy of the concentration and the quantity of the biological particles.
The filter resistor 504 and the filter capacitor 505 form a high-pass filter circuit of the target current signal, and the corresponding calculation formula of the lower limit frequency fx is as follows:
wherein Rl is a filter resistor 504, and Cl is a filter capacitor 505. In a specific application scenario, the selection of the resistance of the filter resistor 504 needs to be limited, and when the resistance of the filter resistor 504 is too large, even if the target current is very weak, the voltage across the filter resistor 504, the voltage across the filter capacitor 505, and the input voltage of the operational amplifier 501 are too large, thereby causing damage to the above components. For example, the filter resistor 504 may have a resistance of 1M Ω. The capacitance of the filter capacitor 505 may be 10uF, and the corresponding lower limit frequency fx obtained according to equation (4) is 0.016 Hz.
In an example, the filter resistor 504 may be a metal film resistor, where the metal film resistor has a wide operating frequency range, is suitable for a high-frequency circuit, has a stable voltage and a small temperature coefficient, and can improve the accuracy of target current signal acquisition. Thereby optimizing the product performance of the detection structure. In another example, the filter capacitor 505 is a ceramic capacitor, and the ceramic capacitor has a relatively wide temperature coefficient of capacitance, so that the accuracy of target current signal acquisition can be ensured on the basis of eliminating background noise.
In an alternative embodiment of the invention, the signal conversion circuit 5 may further include a voltage adjustment unit, where the voltage adjustment unit includes a first adjustment resistor 506, a second adjustment resistor 507, a third adjustment resistor 508, a fourth adjustment resistor 509, and a fifth adjustment resistor 510, where the third adjustment resistor 508 and the fourth adjustment resistor 509 are adjustable resistors. One end of the first adjusting resistor 506 is connected to a positive power supply, one end of the second adjusting resistor 507 is connected to a negative power supply, the other end of the first adjusting resistor 506, the other end of the second adjusting resistor 507, one end of the third adjusting resistor 508 and one end of the fourth adjusting resistor 509 are coupled to form a third node C, and the adjusting end of the third adjusting resistor 508, the adjusting end of the fourth adjusting resistor 509 and one section of the fifth adjusting resistor 510 are coupled to the non-inverting input terminal of the operational amplifier 501 and form a fourth node D. The other end of the third adjusting resistor 508, the other end of the fourth adjusting resistor 509 and the other end of the fifth adjusting resistor 510 are all grounded. The operational amplifier 501 may be powered by both positive and negative power supplies, with a better linearity range than the power supply. Wherein the voltage regulating unit provides a reference level for the operational amplifier 501. The dc bias operating point of the operational amplifier 501 can be adjusted by adjusting the resistances of the third adjusting resistor 508 and the fourth adjusting resistor 509. Therefore, the pulse direct current signal corresponding to the fluorescence can be more easily acquired.
The voltage regulation unit may further include a regulation capacitor 511, one end of the regulation capacitor 511 is coupled to the fourth node D, and the other end of the regulation capacitor 511 is grounded, so that noise on the positive power supply + VCC and the negative power supply-VCC can be filtered out, and the operational amplifier 501 is prevented from being polluted by power supply noise. In the present invention, a capacitor having the same function as the adjustment capacitor 511 may be added at other positions, and the corresponding coupling position is not limited, and may be selected according to specific situations, so as to create a clean circuit environment for the operational amplifier 501.
In an alternative embodiment of the invention, the air typically contains dust particles in addition to the biological particles. The structure further comprises a scattered light filter 6 and a scattered receiver 7 which are positioned in the air flow channel 1, wherein the scattered light filter 6 and the laser light source 2 are oppositely arranged on two sides of the air flow channel 1. The light source direction of the laser light source 2 faces the air flow channel 1, and is used for irradiating the air flowing in the air flow channel 1. The laser light source 2 excites dust particles in the air flow channel 1 to generate scattered light. Specifically, when dust particles in the air pass through the region of the air flow channel 1 between the laser light source 2 and the scattered light filter 6, the laser light source 2 is shielded from generating scattered light, which is in the form of light pulses. The scattered light filter 6 is permeable to the scattered light. The scattering receiver 7 converts the scattered light transmitted through the scattered light filter 6 into a scattering voltage signal, so that after the signal processing system 8 collects the scattering voltage signal, the number of the dust particles is determined according to the voltage value of the scattering voltage signal.
For example, the scattered voltage signal may be counted or counted over a unit time. Thereby, the concentration and the amount of dust particles can be accurately metered. Meanwhile, a voltage threshold value can be correspondingly set, when the concentration and the quantity of dust particles exceed the voltage threshold value, the dust index in the air in the current air flow channel 1 is determined to be in an overproof state, and audible and visual alarm can be carried out, so that a user is reminded to replace the filtering structure 9 for filtering the air in time.
The invention can accurately measure the concentration and the quantity of biological particles and dust particles in the air, provides scientific and rigorous basis for replacing the filtering structure 9, and can monitor the air quality in real time.
Referring to figure 5, the present invention provides an air filtration device comprising an air detection arrangement and a filter arrangement 9 as described in any one of the above.
The present invention provides an air filtration device comprising the above mentioned air filtration apparatus. Wherein, the air filtering device can comprise a fresh air device, a breathing machine and other devices. Referring to fig. 6, a schematic diagram of a ventilator is shown. Wherein, the breathing machine includes respiratory device, and respiratory device includes air inlet and gas outlet. In one example, the filter device may be further installed at a position of an air outlet of the air exhaled from the user, and the filter device may be used to prevent biological particles such as bacteria exhaled from the user from contaminating the breathing apparatus. When the filtering device fails or the filtering efficiency is reduced, biological particles are immersed in the breathing device, so that pollution is propagated and expanded. The respiratory system is compromised when used next time or by other users. Therefore, when the biological particles pass through the filtering device and exceed the threshold value, the user is reminded to replace the biological particles in time, and the safety of each mouth in breathing is guaranteed.
In another example, a filter device may be installed at the location of the air inlet for evaluating the filtering efficiency of the filter device at the air inlet. When the filtering efficiency of the filtering device meets the filtering requirement, few or no biological particles and/or dust particles penetrate through the filtering device in the input air, and scattered light and fluorescence have no light pulse signals and are represented as circuit background noise on the electric signals. When the filtering efficiency of the filtering device is reduced, biological particles and/or dust particles penetrating through the filtering device in input air begin to increase, scattered light or fluorescence pulse signals increase, and the signal processing system 8 counts that the scattered light or fluorescence pulse signals exceed a set threshold, the filtering device fails, service cannot be continuously provided, and the filtering device needs to be replaced in time.
In summary, the present invention includes an air flow channel 1 for air circulation, a laser light source 2, a fluorescence filter 3, a fluorescence receiver 4, and a signal conversion circuit 5, wherein the laser light source 2, the fluorescence filter 3, and the fluorescence receiver 4 are located in the air flow channel 1, and the fluorescence filter 3 and the laser light source 2 are oppositely disposed on two sides of the air flow channel 1. The laser light source 2 can excite the biological particles in the air flow channel 1 to generate scattered light and fluorescence, the fluorescence filter 3 reflects the scattered light, and then the fluorescence filter 3 can be transmitted by the fluorescence. The fluorescence receiver 4 converts the fluorescence transmitted through the fluorescence filter 3 into a target current signal, and the signal conversion circuit 5 converts the target current signal into a target voltage signal, so that after the signal processing system 8 collects the target voltage signal, the number of the biological particles is determined according to the voltage value of the target voltage signal. Therefore, the concentration and the quantity of the biological particles can be accurately measured, scientific and rigorous bases are provided for replacing the filtering device, and the air quality can be monitored in real time.
The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
As is readily imaginable to the person skilled in the art: any combination of the above embodiments is possible, and thus any combination between the above embodiments is an embodiment of the present invention, but the present disclosure is not necessarily detailed herein for reasons of space.
In the description provided herein, numerous specific details are set forth. It is understood, however, that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
Similarly, it should be appreciated that in the foregoing description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the invention and aiding in the understanding of one or more of the various inventive aspects.
Furthermore, those skilled in the art will appreciate that while some embodiments described herein include some features included in other embodiments, rather than other features, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the claims, any of the claimed embodiments may be used in any combination.
Claims (9)
1. The air detection structure is characterized by comprising an air flow channel (1) for air circulation, a laser light source (2), a fluorescent filter (3), a fluorescent receiver (4) and a signal conversion circuit (5), wherein the laser light source (2), the fluorescent filter (3) and the fluorescent receiver (4) are positioned in the air flow channel (1), and the fluorescent filter (3) and the laser light source (2) are oppositely arranged on two sides of the air flow channel (1); wherein the content of the first and second substances,
the laser light source (2) excites biological particles in the air flow channel (1) to generate scattered light and fluorescence, the fluorescence filter (3) reflects the scattered light, and the fluorescence filter (3) can be penetrated by the fluorescence;
the fluorescence receiver (4) converts the fluorescence which penetrates through the fluorescence filter (3) into a target current signal, and the signal conversion circuit (5) converts the target current signal into a target voltage signal, so that after a signal processing system (8) collects the target voltage signal, the number of the biological particles is determined according to the voltage value of the target voltage signal.
2. Air detection structure according to claim 1, characterized in that the fluorescence receiver (4) is a photomultiplier or an enhanced photodiode.
3. An air detection structure according to claim 2, characterized in that the signal conversion circuit (5) comprises an operational amplifier (501), a compensation capacitor (502) and a gain resistor (503); wherein the content of the first and second substances,
the cathode of the fluorescent receiver (4) is used as a signal input end of the signal conversion circuit (5), and the cathode of the fluorescent receiver (4), one end of a compensation capacitor (502) and one end of the gain resistor (503) are respectively coupled to form a first node;
the anode of the fluorescent receiver (4) and the non-inverting input end of the operational amplifier (501) are both grounded, and the other end of the compensation capacitor (502), the other end of the gain resistor (503) and the output end of the operational amplifier (501) are coupled at the same time and form a second node, wherein the second node is used as the signal output end of the signal conversion circuit (5), so that a signal processing system (8) is coupled with the signal output end to collect the target voltage signal.
4. The air detection structure according to claim 1, wherein the signal conversion circuit (5) further comprises a filter unit coupled to a cathode of the fluorescence receiver (4), the filter unit comprising a filter resistor (504) and a filter capacitor (505);
the filter resistor (504) is connected with the fluorescent receiver (4) in parallel, and the filter capacitor (505) is coupled between the cathode of the fluorescent receiver (4) and the negative phase output end of the operational amplifier (501).
5. The air detection structure according to claim 4, wherein the filter resistor (504) is a metal film resistor.
6. The air detection structure according to claim 5, characterized in that the filter capacitor (505) is a ceramic capacitor.
7. An air detection structure according to any one of claims 1 to 6, characterized in that the structure further comprises a scattering optical filter (6) and a scattering receiver (7) located in the air flow channel (1), the scattering optical filter (6) and the laser light source (2) being oppositely arranged on both sides of the air flow channel (1); wherein the content of the first and second substances,
the laser light source (2) excites dust particles in the air flow channel (1) to generate scattered light, and the scattered light filter (6) can be transmitted by the scattered light;
the scattering receiver (7) converts the scattered light which penetrates through the scattering light filter (6) into scattering voltage signals, so that after the scattering voltage signals are collected by a signal processing system (8), the quantity of the dust particles is determined according to the voltage values of the scattering voltage signals.
8. An air filtration device comprising an air detection structure according to any one of claims 1 to 7.
9. An air filtration device characterized in that said device comprises an air filtration apparatus as claimed in claim 8.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
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| CN202111678068.1A CN114307443A (en) | 2021-12-31 | 2021-12-31 | Empty gas detection surveys structure, air filter equipment and filtration equipment |
| PCT/CN2022/142087 WO2023125449A1 (en) | 2021-12-31 | 2022-12-26 | Air test structure, air filtration device and breathing machine |
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| CN202111678068.1A CN114307443A (en) | 2021-12-31 | 2021-12-31 | Empty gas detection surveys structure, air filter equipment and filtration equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023125449A1 (en) * | 2021-12-31 | 2023-07-06 | 天津怡和嘉业医疗科技有限公司 | Air test structure, air filtration device and breathing machine |
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| CN114307443A (en) * | 2021-12-31 | 2022-04-12 | 天津怡和嘉业医疗科技有限公司 | Empty gas detection surveys structure, air filter equipment and filtration equipment |
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| WO2023125449A1 (en) * | 2021-12-31 | 2023-07-06 | 天津怡和嘉业医疗科技有限公司 | Air test structure, air filtration device and breathing machine |
Also Published As
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| WO2023125449A1 (en) | 2023-07-06 |
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