CN211741143U - Portable air anion concentration detector - Google Patents
Portable air anion concentration detector Download PDFInfo
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- CN211741143U CN211741143U CN202020245227.3U CN202020245227U CN211741143U CN 211741143 U CN211741143 U CN 211741143U CN 202020245227 U CN202020245227 U CN 202020245227U CN 211741143 U CN211741143 U CN 211741143U
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Abstract
The utility model discloses a portable air anion concentration detector, relating to the field of monitoring equipment, and adopting the technical scheme that the detector comprises an ion collection wind path channel consisting of a double cylindrical shaft type ion collector and a fan; the ion collector is characterized by further comprising a display module, a signal acquisition module and a power supply module, wherein the display module and the signal acquisition module are respectively electrically connected with the control module, the power supply module is used for supplying power to all the components, and the signal acquisition module is electrically connected with the ion collector to form an acquisition channel. The utility model has the advantages that: the device can be used in high and low concentration negative ion environments, has wide measurement range and high precision, and can carry out real-time detection. By adopting the INA116 chip, the device is basically not limited by the conventional temperature environment, and the influence of the temperature of different environments on the detection result is greatly reduced. The problem of detection interference of the device is also well improved by improving the physical structure of the circuit board.
Description
Technical Field
The utility model relates to a monitoring facilities field, in particular to portable air anion concentration detector.
Background
The air anion concentration detector is suitable for a device for detecting the concentration of anions contained in unit volume in air. Air anion concentration detector obtains the electric current size that contains anion in certain volume air through ion collector and corresponds, then detects the size of this electric current through little current meter, and the electric current size that will little current meter survey at last converts the number of the anion that contains in unit volume air into through the controller, and at present, air anion detection device mainly is portable and two kinds of types of outdoor measurement, and portable device's measuring range is little, the precision is not high, and current little current circuit design voltage and signal are unstable, lead to the measuring result accuracy low.
SUMMERY OF THE UTILITY MODEL
To the technical problem, the utility model provides a portable air anion concentration detector.
The technical scheme is that the ion collector comprises an ion collecting air passage formed by an ion collector and a fan; the ion collector is characterized by further comprising a display module, a signal acquisition module and a power supply module, wherein the display module, the signal acquisition module and the power supply module are respectively electrically connected with the control module, the power supply module supplies power to all the components, the signal acquisition module is electrically connected with the ion collector to form an acquisition path, the acquisition path comprises an I-V conversion module, a primary filter circuit, a voltage secondary amplification circuit, a secondary filter circuit and an A/D conversion module which are sequentially and electrically connected, the input end of the I-V conversion module is electrically connected with the acquisition end of the ion collector, and the output end of the A/D conversion module is electrically connected with the input end of the control module; the voltage secondary amplifying circuit is called a voltage secondary amplifying circuit, because the current is amplified once when converted into voltage in the I-V conversion module, the current is amplified again after the first-stage filtering;
the power supply module is electrically connected with the shell of the ion collector, applies negative voltage to the ion collector, and a band-pass filter circuit is arranged between the power supply module and the outer barrel; selecting a section of signal voltage with specific frequency by a control mode, and adding the signal voltage on the outer wall of the negative oxygen ion collecting tube; the requirement of the polar voltage of a specific frequency here is that the generated polar voltage ripple is less than 50 MV.
Preferably, the I-V conversion module is a high impedance I-V conversion circuit, an input end of the I-V conversion module is connected to an output end of the ion collector, and an input current of an operational amplifier in the I-V conversion circuit is an output current of the ion collector.
Preferably, the input resistance of the operational amplifier in the I-V conversion block is a large resistance of 10G.
Preferably, the band-pass filter circuit comprises a high-pass filter circuit and a low-pass filter circuit which are connected in series, the high-pass filter circuit comprises a voltage stabilizing diode, one side of a negative electrode of the voltage stabilizing diode is provided with a grounding inductor, and one side of a positive electrode of the voltage stabilizing diode is provided with a grounding capacitor.
The low-pass filter circuit is a passive low-pass filter circuit. By adding a low-pass filter circuit, a voltage signal with a specific frequency can be selected through the combination of the two circuits. The critical frequency calculation formula is:
preferably, the current output by the ion collector ranges from fA to nA.
Preferably, the model of the operational amplifier chip of the I-V conversion module is INA 116.
Preferably, a through groove 2 is formed in the circuit board 1 where the INA116 chip is located, the input end of the INA116 chip is connected to the input pin 10, the input pin 10 is bent in an L shape, one end of the input pin is electrically connected to the input end of the INA116 chip, and the other end of the input pin is arranged in the middle of the through groove 2 in an overhead manner.
Preferably, the voltage secondary amplification circuit is added with a high-low range automatic switching function and a corresponding circuit design, and automatic detection in the environment of high concentration or low concentration of negative ions is realized.
Through the high-low range automatic switching circuit, the amplifier chip is connected with different resistors through the relay selection, and the change of the range is realized.
Preferably, in order to expand the detection range and accuracy, the voltage secondary amplification circuit is connected to the high-low range automatic switching circuit, and a specific pin of an amplifier of the voltage secondary amplification circuit is connected to a different resistor through a relay, so that the range is changed. On the voltage secondary amplification circuit, the high-low range automatic switching function and the corresponding circuit design are added, so that automatic detection in the environment of high concentration or low concentration of negative ions is realized, and the conduction of the high-low range is controlled through the pin CTRL1 on the right side.
Preferably, the system also comprises a corresponding control system and a display system, the digital signal is further processed by the control system and is transmitted to the display system, and the detection result is output on a display screen by the display system.
The embodiment of the utility model provides a beneficial effect that technical scheme brought is: the device can be used in high and low concentration negative ion environments, has wide measurement range and high precision, and can carry out real-time detection. By adopting the INA116 chip, the device is basically not limited by the conventional temperature environment, and the influence of the temperature of different environments on the detection result is greatly reduced. The problem of detection interference of the device is also well improved by improving the physical structure of the circuit board.
Drawings
Fig. 1 is a schematic diagram of a system principle according to an embodiment of the present invention.
Fig. 2 is the utility model discloses collection system work flow diagram.
Fig. 3 is a circuit diagram of the negative ion collection circuit according to the embodiment of the present invention.
Fig. 4 is a circuit diagram of a voltage secondary amplifying circuit according to an embodiment of the present invention.
Fig. 5 is a high-low range automatic switching circuit according to an embodiment of the present invention.
Fig. 6 is an a/D conversion circuit diagram according to an embodiment of the present invention.
Fig. 7 is a circuit diagram of a bandpass filter according to an embodiment of the present invention.
Fig. 8 is a schematic circuit diagram of a high impedance conversion method according to an embodiment of the present invention.
Fig. 9 is a schematic circuit diagram of an operational amplifier of an I-V conversion module according to an embodiment of the present invention.
Fig. 10 is a schematic diagram of a circuit board structure according to an embodiment of the present invention.
Wherein the reference numerals are: 1. a circuit board; 2. a through groove; 10. and inputting a pin.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. Of course, the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It should be noted that the embodiments and features of the embodiments of the present invention can be combined with each other without conflict.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the invention, unless otherwise specified, "a plurality" means two or more.
In the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the creation of the present invention can be understood by those of ordinary skill in the art through specific situations.
Example 1
Referring to fig. 1 to 10, the present invention provides a portable air negative ion concentration detector, which includes an ion collecting wind path channel composed of a dual cylindrical shaft type ion collector and a fan; the ion collector is characterized by further comprising a display module, a signal acquisition module and a power supply module, wherein the display module, the signal acquisition module and the power supply module are respectively electrically connected with the control module, the power supply module is used for supplying power to all the components, the signal acquisition module is electrically connected with the ion collector to form an acquisition channel, the acquisition channel comprises an I-V conversion module, a primary filter circuit, a voltage secondary amplification circuit, a secondary filter circuit and an A/D conversion module which are sequentially and electrically connected, the input end of the I-V conversion module is electrically connected with the acquisition end of the ion collector, and the output end of the A/D conversion module is; the voltage secondary amplifying circuit is called a voltage secondary amplifying circuit, because the current is amplified once when converted into voltage in the I-V conversion module, the current is amplified again after the first-stage filtering;
in order to collect the negative ions in the unit space, the power supply module is electrically connected with the outer cylinder wall of the ion collector, the power supply module applies negative voltage to the outer cylinder to form a negative electric field, so that the negative ions are deflected and completely collected, and in order to eliminate errors caused by clutter and data fluctuation, a band-pass filter circuit consisting of a high-pass filter circuit and a low-pass filter circuit which are combined is arranged between the power supply module and the outer cylinder; selecting a section of signal voltage with specific frequency by a control mode, and adding the signal voltage on the outer wall of the negative oxygen ion collecting tube; the requirement of the polar voltage of a specific frequency here is that the generated polar voltage ripple is less than 50 MV.
Adopt the axial ion collector of dual drum as anion detection collection passageway, though the device is comparatively complicated, and the process requirement is high, and the cost is also comparatively higher, but only need guarantee that the difference of inside and outside radius is far less than the length of collector and just can neglect the influence of edge effect, its entry is comparatively identical with the fan shape, can obtain the design size that lets the air flow velocity in the collector stable through fluid analysis software, and the volume flow that obtains is comparatively accurate, and secondly, under the same volume, the area of contact of drum type is big, can collect more ions.
The I-V conversion module is a high-impedance I-V conversion circuit, the input end of the I-V conversion module is connected with the output end of the ion collector, and the input current of an operational amplifier in the I-V conversion circuit is the output current of the ion collector. The method adopts a high impedance conversion method in a current-voltage conversion method (I-V), has simple principle, stable performance and high sensitivity, wherein the high impedance conversion method has high resolution and good linearity and is suitable for measuring weaker direct current signals.
The input resistance of the operational amplifier in the I-V conversion module is a large resistance of 10G.
The band-pass filter circuit comprises a high-pass filter circuit and a low-pass filter circuit which are connected in series, the high-pass filter circuit comprises a voltage stabilizing diode, one side of the negative electrode of the voltage stabilizing diode is provided with a grounding inductor, and one side of the positive electrode of the voltage stabilizing diode is provided with a grounding capacitor. The effect of the grounding inductance is equivalent to a resistance, and the reactance increases with the frequency of the alternating current. The inductor is grounded, the low-frequency component of the inductor is grounded through the inductor, which is equivalent to a short circuit but has no or little influence on the circuit due to the short circuit. The ground inductance is selected according to the waveform controlled by the desired polarity voltage.
The low-pass filter circuit is a passive low-pass filter circuit. By adding a low-pass filter circuit, the high-frequency component is grounded through the capacitor, while the low-frequency component can pass through the circuit without loss. Through the combination of the two circuits, a voltage signal of a specific frequency can be selected. The critical frequency calculation formula is:
the range of the current output by the ion collector is fA to nA. The current spans six orders of magnitude. The weak signals can be collected.
The operational amplifier chip model of the I-V conversion module is INA 116.
The design of the ion collector output current signal detection circuit is carried out by adopting a high impedance conversion method, and the input resistance of the circuit is a large resistance of 10G. Because the current to be measured is very small, the influence of each parameter of the operational amplifier is also required to be considered when the circuit is designed, wherein the smaller the bias current is, the more accurate the measurement result is; the offset voltage is directly superposed into the output voltage, so that an operational amplifier with the offset voltage as small as possible needs to be selected; the current noise of the operational amplifier cannot be overcome, and the minimum test current is generally considered to be 3 times of the current noise, so the current noise of the operational amplifier is also as small as possible. And finally, an INA116 chip is selected for designing the I-V conversion circuit.
The INA116 has a very low input bias current and special protection techniques, producing an input bias current of about 3fA at 25 c and only about 25fA at 85 c, its three op amp topology allows gain from 1 to 1000 by connecting external resistors. The INA116 can be used in 16 pin plastic infusion and SOL-16 surface mount packages, with temperatures specified between-40 ℃ and 85 ℃.
On the voltage secondary amplification circuit, the automatic switching function of high and low ranges and the corresponding circuit design are added, and automatic detection in the environment with high or low concentration of negative ions is realized.
Through the high-low range automatic switching circuit, the amplifier chip is connected with different resistors through the relay selection, and the change of the range is realized.
The digital signal is further processed by the control system and transmitted to the display system, and the detection result output value is displayed on a screen by the display system.
Example 2
On the basis of embodiment 1, referring to fig. 4 and 5, in order to expand the detection range and accuracy, the voltage secondary amplification circuit is connected with the high-low range automatic switching circuit, and different resistors are selected and connected at a specific pin of an amplifier of the voltage secondary amplification circuit through a relay, so that the change of the range is realized. On the voltage secondary amplification circuit, the high-low range automatic switching function and the corresponding circuit design are added, so that automatic detection in the environment of high concentration or low concentration of negative ions is realized, and the conduction of the high-low range is controlled through the pin CTRL1 on the right side.
Example 3
On the basis of embodiment 1 or 2, a through groove 2 is formed in a circuit board 1 where the INA116 chip is located, an input end of the INA116 chip is connected to an input pin 10, the input pin 10 is bent in an L shape, one end of the input pin is electrically connected to the input end of the INA116 chip, and the other end of the input pin is arranged in the middle of the through groove 2 in an overhead manner. By adopting the structure, the input pin 10 can greatly avoid interference of other elements of the circuit in the process of receiving signals. And finally, obtaining a stable I-V conversion circuit and a circuit board design.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (5)
1. A portable air anion concentration detector comprises an ion collection air passage formed by an ion collector and a fan; the ion collector is characterized in that the acquisition path comprises an I-V conversion module, a primary filter circuit, a voltage secondary amplification circuit, a secondary filter circuit and an A/D conversion module which are sequentially and electrically connected, the input end of the I-V conversion module is electrically connected with the acquisition end of the ion collector, and the output end of the A/D conversion module is electrically connected with the input end of the control module;
the power supply module is electrically connected with the shell of the ion collector, the power supply module applies negative voltage to the ion collector, and a band-pass filter circuit is arranged between the power supply module and the outer barrel.
2. The portable air negative ion concentration detector according to claim 1, wherein the I-V conversion module is a high impedance I-V conversion circuit, an input end of the I-V conversion module is connected to an output end of the ion collector, and an input current of an operational amplifier in the I-V conversion circuit is an output current of the ion collector.
3. The portable air negative ion concentration detector according to claim 2, wherein the band-pass filter circuit comprises a high-pass filter circuit and a low-pass filter circuit connected in series, the high-pass filter circuit comprises a zener diode, a grounding inductor is arranged on a negative electrode side of the zener diode, and a grounding capacitor is arranged on a positive electrode side of the zener diode.
4. The portable air anion concentration detector of claim 1, wherein the operational amplifier chip model of the I-V conversion module is INA 116.
5. The portable air anion concentration detector according to claim 4, wherein the circuit board (1) on which the INA116 chip is located is provided with a through groove (2), the input end of the INA116 chip is connected with the input pin (10), the input pin (10) is bent in an L shape, one end of the input pin is electrically connected with the input end of the INA116 chip, and the other end of the input pin is arranged in the middle of the through groove (2) in an overhead manner.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020245227.3U CN211741143U (en) | 2020-03-03 | 2020-03-03 | Portable air anion concentration detector |
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| CN202020245227.3U CN211741143U (en) | 2020-03-03 | 2020-03-03 | Portable air anion concentration detector |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112837646A (en) * | 2021-02-02 | 2021-05-25 | 海信视像科技股份有限公司 | Display device and control method thereof |
| CN113447529A (en) * | 2021-08-11 | 2021-09-28 | 漳州市东南电子技术研究所有限公司 | Method and device for testing air anion generation amount in unit time |
| CN113945403A (en) * | 2021-10-14 | 2022-01-18 | 青岛海信日立空调系统有限公司 | Ion generator concentration detection device |
| CN115078463A (en) * | 2022-08-18 | 2022-09-20 | 山东恒美电子科技有限公司 | Automatic detection system for concentration of negative ions in air |
-
2020
- 2020-03-03 CN CN202020245227.3U patent/CN211741143U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112837646A (en) * | 2021-02-02 | 2021-05-25 | 海信视像科技股份有限公司 | Display device and control method thereof |
| CN113447529A (en) * | 2021-08-11 | 2021-09-28 | 漳州市东南电子技术研究所有限公司 | Method and device for testing air anion generation amount in unit time |
| CN113945403A (en) * | 2021-10-14 | 2022-01-18 | 青岛海信日立空调系统有限公司 | Ion generator concentration detection device |
| CN113945403B (en) * | 2021-10-14 | 2024-03-22 | 青岛海信日立空调系统有限公司 | Concentration detection device of ion generator |
| CN115078463A (en) * | 2022-08-18 | 2022-09-20 | 山东恒美电子科技有限公司 | Automatic detection system for concentration of negative ions in air |
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