CN110907587A - Portable formaldehyde detector - Google Patents
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- CN110907587A CN110907587A CN201910977053.1A CN201910977053A CN110907587A CN 110907587 A CN110907587 A CN 110907587A CN 201910977053 A CN201910977053 A CN 201910977053A CN 110907587 A CN110907587 A CN 110907587A
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- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 title claims abstract description 385
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 215
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 108
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 107
- 238000010438 heat treatment Methods 0.000 claims abstract description 55
- 238000006243 chemical reaction Methods 0.000 claims abstract description 40
- 238000001514 detection method Methods 0.000 claims abstract description 35
- 239000007789 gas Substances 0.000 claims abstract description 16
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 11
- 239000001301 oxygen Substances 0.000 claims abstract description 11
- -1 oxygen ions Chemical class 0.000 claims abstract description 11
- 238000007781 pre-processing Methods 0.000 claims description 21
- 238000001914 filtration Methods 0.000 claims description 15
- 230000006698 induction Effects 0.000 claims description 8
- 238000003860 storage Methods 0.000 claims description 5
- 238000013480 data collection Methods 0.000 claims description 3
- 239000000126 substance Substances 0.000 abstract description 10
- 230000035945 sensitivity Effects 0.000 abstract description 4
- 238000000034 method Methods 0.000 description 14
- 239000011159 matrix material Substances 0.000 description 9
- 230000005540 biological transmission Effects 0.000 description 6
- 239000004065 semiconductor Substances 0.000 description 5
- 238000001228 spectrum Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000005070 sampling Methods 0.000 description 3
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 238000005034 decoration Methods 0.000 description 2
- 238000000835 electrochemical detection Methods 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- 238000004817 gas chromatography Methods 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N31/00—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods
- G01N31/005—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods investigating the presence of an element by oxidation
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Abstract
The invention discloses a portable formaldehyde detector, which enables active formaldehyde in the surrounding environment to react with oxygen ions through a micro-heating plate to generate substances such as carbon dioxide and the like, and then the concentration of the formaldehyde is finally confirmed through quickly measuring the concentration of the carbon dioxide around the heating plate. In this application, the heating of micro-heating plate only needs 20ms, consequently, the detection speed of the portable formaldehyde detector of this application is very fast, need not a large amount of latency. In addition, the heating temperature of the micro-heating plate is controlled by the reaction temperature control module, so that the reaction of other reducing substances is avoided, the sensitivity of the portable formaldehyde detector is ensured, and the accuracy of the portable formaldehyde detector for detecting the concentration of the formaldehyde gas is ensured.
Description
Technical Field
The invention relates to the technical field of gas detection, in particular to a portable formaldehyde detector.
Background
Along with the popularization of home decoration, formaldehyde pollution released by paint of new furniture and interior decoration affects the life of people, so that the effective detection of the concentration of formaldehyde in air is very necessary. At present, the air formaldehyde detection method mainly comprises a semiconductor spectrum detection method, an electrochemical spectrum detection method, a phenol reagent method and a gas chromatography method, wherein the detection cost of the phenol reagent method and the gas chromatography method is high, and the method is not suitable for formaldehyde detection in daily families.
Common methods for detecting formaldehyde in daily families are a semiconductor spectrum detection method and an electrochemical spectrum detection method, but the two detection methods have the problems of long detection time, large detection error and the like. For example, the detection principle of the semiconductor detection method is as follows: the concentration of formaldehyde is measured and calculated by utilizing the characteristic that the conductivity of some metal oxide semiconductor materials changes along with the components of the environmental gas at a certain temperature. However, the accuracy of semiconductor detection methods is poor.
For another example, the detection principle of the electrochemical detection method is as follows: the formaldehyde is made to pass through the selective permeable membrane and contact with the electrolyte of the sensor, and then the concentration of the formaldehyde is measured and calculated by detecting the diffusion speed of the formaldehyde in the electrolyte. However, the electrochemical detection method has a problem of large variation among individuals, and is not easy to be widely used because it requires a long detection time in use.
Therefore, a formaldehyde detector with high detection speed, high detection accuracy and portability is needed.
Disclosure of Invention
The invention provides a portable formaldehyde detector, and aims to solve the problems of long detection time or large detection error in the formaldehyde detection process in the prior art.
In order to achieve the purpose, the application provides a portable formaldehyde detector which comprises a formaldehyde reaction unit, a carbon dioxide induction module, a data set acquisition module, a data preprocessing unit, a data interface and a mobile terminal, wherein the formaldehyde reaction unit, the carbon dioxide induction module, the data set acquisition module, the data preprocessing unit, the data interface and the mobile terminal are electrically connected in sequence; wherein,
the formaldehyde reaction unit comprises a formaldehyde reactor and a reaction temperature control module which are electrically connected with each other, wherein the formaldehyde reactor comprises a micro heating plate, and the micro heating plate is used for enabling formaldehyde gas in a preset distance range of the micro heating plate to chemically react with oxygen ions to generate carbon dioxide; the reaction temperature control module is used for controlling the heating temperature of the micro heating plate, wherein the heating temperature range is 35-50 ℃;
the carbon dioxide sensing module is used for detecting the concentration of carbon dioxide in the surrounding environment in real time, wherein k is the detection frequency, k =1, 2, 3, … …, n and n are positive integers;
the data set acquisition module is used for acquiring the concentration of the carbon dioxide detected by the carbon dioxide induction module;
the data preprocessing unit is used for preprocessing the concentration of the carbon dioxide detected by the data set acquisition module to obtain the preprocessed concentration of the carbon dioxide;
the data interface is used for being connected with the mobile terminal and transmitting the carbon dioxide concentration preprocessed by the data preprocessing unit to the mobile terminal;
the mobile terminal is used for calculating the concentration of formaldehyde in the surrounding environment according to the concentration of carbon dioxide preprocessed by the data preprocessing unit.
Preferably, the data preprocessing unit comprises a data judgment module and a data filtering module which are electrically connected with each other;
the data judgment module is used for judging whether the concentration of the carbon dioxide collected by the data collection module exceeds a preset effective range of the carbon dioxide;
the data filtering module is used for judging the carbon dioxide concentration as invalid data when the data judging module judges that the carbon dioxide concentration exceeds a preset effective range of carbon dioxide, and filtering and removing the carbon dioxide concentration which becomes the invalid data.
Preferably, the mobile terminal includes:
and the calculation module is electrically connected with the data filtering module through a data interface and is used for calculating the concentration of the formaldehyde in the surrounding environment according to the concentration of the carbon dioxide obtained by filtering through the data filtering module.
Preferably, the mobile terminal further comprises:
and the storage module is electrically connected with the calculation module and is used for storing the concentration of the formaldehyde calculated by the calculation module.
Preferably, the mobile terminal further comprises:
and the data display module is electrically connected with the calculation module and is used for displaying the formaldehyde concentration in the surrounding environment calculated by the calculation module.
Preferably, the data interface comprises a USB Type-C data interface.
Preferably, the data interface comprises a lightning data interface.
Preferably, the data interface comprises a Micro USB data interface.
The portable formaldehyde detector comprises a formaldehyde reaction unit, a carbon dioxide induction module, a data set acquisition module, a data preprocessing unit, a data interface and a mobile terminal, wherein the formaldehyde reaction unit comprises a formaldehyde reactor and a reaction temperature control module, the formaldehyde reactor comprises a micro-heating plate, and formaldehyde gas in the surrounding environment reacts with oxygen ions by heating the micro-heating plate to generate carbon dioxide; the reaction temperature control module is used for controlling the heating temperature of the micro heating plate; the carbon dioxide sensing module is used for detecting the concentration of carbon dioxide in the surrounding environment in real time, wherein k =1, 2, 3 … …; the data set acquisition module is used for acquiring the concentration of the carbon dioxide detected by the carbon dioxide induction module; the data preprocessing unit is used for preprocessing the detected carbon dioxide concentration; the data interface is used for being connected with the mobile terminal through a data line and transmitting the concentration of the carbon dioxide after pretreatment to the mobile terminal; and the mobile terminal is used for calculating the concentration of formaldehyde in the surrounding environment according to the concentration of the filtered carbon dioxide.
The portable formaldehyde detector that this application provided makes active formaldehyde body and oxygen ion in the surrounding environment take place to react through the micro-heating board, generates substances such as carbon dioxide, then through the carbon dioxide concentration around the rapid survey, finally confirms formaldehyde gas's concentration. In this application, the heating of micro-heating plate only needs 20ms, consequently, the detection speed of the portable formaldehyde detector of this application is very fast, need not a large amount of latency. In addition, the heating temperature of the micro-heating plate is controlled by the reaction temperature control module, so that the reaction of other reducing substances is avoided, the sensitivity of the portable formaldehyde detector is ensured, and the accuracy of the portable formaldehyde detector for detecting the concentration of the formaldehyde gas is ensured. In addition, in this application portable formaldehyde detector passes through data line connection data interface and mobile terminal, through the data line, conveys carbon dioxide concentration to mobile terminal, and to USB Type-C data interface (being C Type USB data interface) for example, USB Type-C data interface's data transmission speed reaches 10Gbit/s, satisfies the data transmission requirement of inserting promptly to survey. The mobile terminal provides energy for the portable formaldehyde detector through the data line, namely, power supply devices such as batteries and the like are not arranged in the portable formaldehyde detector, so that on one hand, the size of the portable formaldehyde detector can be reduced, the portable formaldehyde detector is convenient to carry and use, and the limitation of the detection environment caused by overlarge size is overcome; on the other hand, the manufacturing cost of the portable formaldehyde detector can be reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic diagram of an internal structure of a portable formaldehyde detector provided in an embodiment of the present invention.
The reference numbers illustrate:
the implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are only for descriptive purposes 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" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "connected," "secured," and the like are to be construed broadly, and for example, "secured" may be a fixed connection, a removable connection, or an integral part; "connected" may be mechanically connected or connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In addition, the technical solutions in the embodiments of the present invention may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination of technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a schematic view of the internal structure of the portable formaldehyde detector of the present application. The embodiment of the application provides a portable formaldehyde detector for formaldehyde among the family detects. As shown in fig. 1, the portable formaldehyde detector comprises a formaldehyde reaction unit 1, a carbon dioxide sensing module 2, a data collection module 3, a data preprocessing unit 4, a data interface 5 and a mobile terminal 6.
In this application, formaldehyde reaction unit 1 includes formaldehyde reactor 11 and reaction temperature control module 12, and wherein, formaldehyde reactor 11 includes micro-heating board (not drawn in the picture), through heating micro-heating board, makes the formaldehyde gas in the surrounding environment react with oxygen ion emergence, generates carbon dioxide, and its chemical formula of reaction is: HCHO + O2→H2O+CO2。
Formaldehyde is a relatively active reducing gas, and therefore, formaldehyde and oxygen ions in a predetermined distance range in the surrounding environment can be reacted by heating the micro-heating plate, then a fixed gas such as carbon dioxide substance is generated, and then the concentration of formaldehyde gas can be finally deduced by rapidly measuring the surrounding carbon dioxide concentration, wherein the predetermined distance range is between 0.5 and 0.8 mm. When in actual use, the heating time of micro-heating board generally only needs 20ms, and its heating process and reaction process all go on fast, consequently, the detection speed of the portable formaldehyde detector of this application is very fast, need not a large amount of latency, the extensive daily use of being convenient for.
The utility model provides a portable formaldehyde detector's detection principle utilizes the micro-heating board to formaldehyde in the air and micro-heating board reaction to generate carbon dioxide, and after the heating, reads carbon dioxide concentration fast and detects formaldehyde concentration. Therefore, during the detection process, the reaction of other reducing substances with oxygen ions to generate carbon dioxide should be avoided, so as to ensure the accuracy of the detection result.
Considering that volatile pollutants are almost free of substances with stronger reducibility than formaldehyde, the temperature of the micro-heating plate is controlled to a certain range, so that the interference of other reducing gases can be effectively avoided. In this application, the temperature range of the micro-heating plate is 35-50 ℃. The utility model provides a portable formaldehyde detector utilizes the heating temperature of reaction temperature control module control micro-heating board to avoid the reaction of other reducing substance. The sensitivity of the portable formaldehyde detector is determined by the control of the reaction temperature control module on the heating temperature.
The carbon dioxide sensing module 2 is used for detecting the concentration of carbon dioxide in the surrounding environment in real time, wherein k is the detection frequency, k =1, 2, 3, … …, n, and n is a positive integer.
The data set acquisition module 3 is used for acquiring the carbon dioxide concentration detected by the carbon dioxide sensing module 2 and transmitting the acquired carbon dioxide concentration to the data preprocessing unit 4.
The data preprocessing unit 4 receives the carbon dioxide concentration sent by the data set acquisition module 3 and preprocesses the detected carbon dioxide concentration. In this application, the data preprocessing unit 4 includes a data determining module 41 and a data filtering module 42, wherein the data determining module 41 is configured to determine whether the detected carbon dioxide concentration exceeds a preset effective range of carbon dioxide. The data filtering module 42 is configured to determine the carbon dioxide concentration as invalid data when the carbon dioxide concentration exceeds a preset effective range of carbon dioxide, and filter and remove the carbon dioxide concentration. During specific use, the effective range of carbon dioxide is preset according to actual conditions, and if the detected carbon dioxide concentration is higher than or lower than the preset effective range of carbon dioxide, the carbon dioxide concentration is considered as invalid data and should be filtered and removed to ensure the validity of the whole data, so that the accuracy of a detection result is ensured. In this example, the predetermined effective range of carbon dioxide is 340-1000 ppm.
The data interface 5 is used for connecting with the mobile terminal through a data line and transmitting the filtered carbon dioxide concentration to the mobile terminal 6.
The data interface 5 is used for connecting with the mobile terminal 6 through a data line, and on one hand, the carbon dioxide concentration can be transmitted to the mobile terminal 6 through the data line; on the other hand, the mobile terminal 6 may supply power to the portable formaldehyde detector through the data line. The portable formaldehyde detector is not internally provided with power supply devices such as a battery, so that the size of the portable formaldehyde detector can be reduced, and the manufacturing cost of the portable formaldehyde detector can be reduced. In the use process, the portable formaldehyde detector is connected with the mobile terminal 6 through the data line, namely the power supply to the portable formaldehyde detector can be realized, and the use process is simple and convenient.
Aiming at the Type of the data interface of the current mobile phone, the data interface comprises a C Type USB Type-C data interface, a lightning data interface and a Micro USB data interface. It should be noted that a person skilled in the art may select a suitable data interface type as required, which falls within the scope of protection of the present application. In the example, the data interface takes the USB Type-C data interface as an example, the data transmission speed of the USB Type-C data interface reaches 10Gbit/s, and the data transmission requirement of plug and test is met.
The mobile terminal 6 calculates the concentration of formaldehyde in the surrounding environment according to the concentration of the filtered carbon dioxide. In this application, mobile terminal 6 includes calculation module 61, calculation module 61 is used for calculating the formaldehyde concentration in the surrounding environment according to the carbon dioxide concentration after filtering, and the calculation process includes:
dividing carbon dioxide in the air into two states, namely the original concentration of the carbon dioxide in the air and the concentration of the carbon dioxide generated by formaldehyde reaction, wherein the (= (,), namely the concentration of the carbon dioxide has two states;
establishing a covariance matrix according to a correlation between the concentrations of the two carbon dioxide, namely, the larger the difference between the concentrations of the two carbon dioxide at the same position is, the larger the concentration of the formaldehyde is, wherein each value of the matrix is the correlation degree between the first variable and the second variable;
modeling the concentrations of the two carbon dioxide into Gaussian distribution, acquiring the concentrations of the two carbon dioxide, and calculating a real concentration value, namely a mean value, wherein a covariance matrix in time is =;
predicting the state of the next carbon dioxide by examining the state of the current carbon dioxide, taken to represent the predicting step:
the concentration of carbon dioxide produced by the reaction of formaldehyde = +,
the original carbon dioxide concentration in air =,
the two carbon dioxide concentrations are converted into a matrix form, namely a prediction matrix is as follows: in the following description of the preferred embodiment of the invention' =,
combining the prediction matrix and the best estimate yields: obtaining the best prediction value, and updating the prediction matrix at the same time;
and obtaining a new sampling value by adopting a loop iteration method.
The calculation of the formaldehyde concentration will be described below by way of a specific example.
In this example, the heating temperature of the micro-heating plate is 45 ℃, under the temperature condition, the reaction rate coefficient of formaldehyde and oxygen in the air is 0.24, the sampling time is 0.1 second, the concentration of carbon dioxide in the air before the reaction is 465ppm according to the parameter of the carbon dioxide collecting sensing module, the reaction concentration collected by the carbon dioxide collecting sensing module after the reaction is 523ppm, the covariance matrix at this time is x, and at this timek= at this time, Fk=，xk-1= start updating the prediction matrix next: and (h) =.
The iterative test can then be carried out continuously, with the amount of carbon dioxide produced after the formaldehyde reaction being 1:1, in this case according to xkAnd the concentration of the formaldehyde can be calculated according to the sampling time.
In order to store the calculated formaldehyde concentration, in the present application, the mobile terminal 6 includes a storage module 62, and the storage module 62 is configured to store the calculated formaldehyde concentration.
In order to facilitate checking the calculated formaldehyde concentration, in the present application, the mobile terminal 6 further includes a data display module 63, and the data display module 63 is configured to display the calculated formaldehyde concentration. Of course, there are many forms of display, such as data tables, data histograms, etc., which fall within the scope of the present application.
The portable formaldehyde detector comprises a formaldehyde reaction unit, a carbon dioxide induction module, a data set acquisition module, a data preprocessing unit, a data interface and a mobile terminal, wherein the formaldehyde reaction unit comprises a formaldehyde reactor and a reaction temperature control module, the formaldehyde reactor comprises a micro-heating plate, and formaldehyde gas in the surrounding environment reacts with oxygen ions by heating the micro-heating plate to generate carbon dioxide; the reaction temperature control module is used for controlling the heating temperature of the micro heating plate; the carbon dioxide sensing module is used for detecting the concentration of carbon dioxide in the surrounding environment in real time, wherein k =1, 2, 3 … …; the data set acquisition module is used for acquiring the concentration of the carbon dioxide detected by the carbon dioxide induction module; the data preprocessing unit is used for preprocessing the detected carbon dioxide concentration; the data interface is used for being connected with the mobile terminal through a data line and transmitting the concentration of the carbon dioxide after pretreatment to the mobile terminal; and the mobile terminal is used for calculating the concentration of formaldehyde in the surrounding environment according to the concentration of the filtered carbon dioxide.
The portable formaldehyde detector that this application provided makes active formaldehyde body and oxygen ion in the surrounding environment take place to react through the micro-heating board, generates substances such as carbon dioxide, then through the carbon dioxide concentration around the rapid survey, finally confirms formaldehyde gas's concentration. In this application, the heating of micro-heating plate only needs 20ms, consequently, the detection speed of the portable formaldehyde detector of this application is very fast, need not a large amount of latency. In addition, the heating temperature of the micro-heating plate is controlled by the reaction temperature control module, so that the reaction of other reducing substances is avoided, the sensitivity of the portable formaldehyde detector is ensured, and the accuracy of the portable formaldehyde detector for detecting the concentration of the formaldehyde gas is ensured. In addition, in this application portable formaldehyde detector passes through data line connection data interface and mobile terminal, through the data line, conveys carbon dioxide concentration to the mobile terminal in the mobile terminal, and to take Type-C USB data interface as an example, the data transmission speed of Type-C USB data interface reaches 10Gbit/s, satisfies the data transmission requirement of plug-and-play survey. The mobile terminal provides energy for the portable formaldehyde detector through the data line, namely, power supply devices such as batteries and the like are not arranged in the portable formaldehyde detector, so that on one hand, the size of the portable formaldehyde detector can be reduced, the portable formaldehyde detector is convenient to carry and use, and the limitation of the detection environment caused by overlarge size is overcome; on the other hand, the manufacturing cost of the portable formaldehyde detector can be reduced.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (8)
1. A portable formaldehyde detector is characterized by comprising a formaldehyde reaction unit (1), a carbon dioxide sensing module (2), a data set acquisition module (3), a data preprocessing unit (4), a data interface (5) and a mobile terminal (6), which are electrically connected in sequence;
the formaldehyde reaction unit (1) comprises a formaldehyde reactor (11) and a reaction temperature control module (12) which are electrically connected with each other; the formaldehyde reactor (11) comprises a micro heating plate, wherein the micro heating plate is used for enabling formaldehyde gas in a preset distance range of the micro heating plate to chemically react with oxygen ions to generate carbon dioxide; the reaction temperature control module (12) is used for controlling the heating temperature of the micro heating plate;
the carbon dioxide sensing module (2) is used for detecting the concentration of carbon dioxide in the surrounding environment in real time, wherein k is the detection frequency, k =1, 2, 3, … …, n is a positive integer;
the data collection and collection module (3) is used for collecting the concentration of the carbon dioxide detected by the carbon dioxide induction module (2);
the data preprocessing unit (4) is used for preprocessing the concentration of the carbon dioxide acquired by the data set acquisition module (3) to obtain the preprocessed concentration of the carbon dioxide;
the data interface (5) is used for being connected with the mobile terminal (6) and transmitting the concentration of the carbon dioxide pretreated by the data pretreatment unit (4) to the mobile terminal (6);
and the mobile terminal (6) is used for calculating the concentration of formaldehyde in the surrounding environment according to the concentration of carbon dioxide pretreated by the data pretreatment unit (4).
2. The portable formaldehyde detector according to claim 1, wherein the data preprocessing unit (4) comprises a data judgment module (41) and a data filtering module (42) electrically connected to each other;
the data judgment module (41) is used for judging whether the concentration of the carbon dioxide collected by the data set collection module (3) exceeds a preset effective range of the carbon dioxide;
the data filtering module (42) is used for judging the carbon dioxide concentration as invalid data and filtering and removing the carbon dioxide concentration which becomes invalid data when the data judging module (41) judges that the carbon dioxide concentration exceeds the preset effective range of carbon dioxide.
3. The portable formaldehyde detector according to claim 2, wherein the mobile terminal (6) comprises:
and the calculation module (61) is electrically connected with the data filtering module (42) through the data interface (5), and the calculation module (61) is used for calculating the concentration of formaldehyde in the surrounding environment according to the concentration of carbon dioxide obtained by filtering through the data filtering module (42).
4. The portable formaldehyde detector according to claim 3, wherein the mobile terminal (6) further comprises:
and the storage module (62) is electrically connected with the calculation module (61), and the storage module (62) is used for storing the concentration of the formaldehyde calculated by the calculation module (61).
5. The portable formaldehyde detector according to claim 3, wherein the mobile terminal (6) further comprises:
and the data display module (63) is electrically connected with the calculation module (61), and the data display module (63) is used for displaying the formaldehyde concentration in the surrounding environment calculated by the calculation module (61).
6. The portable formaldehyde detector according to claim 1, wherein the data interface (5) comprises a USBType-C data interface.
7. The portable formaldehyde detector according to claim 1, wherein the data interface (5) comprises a lightning data interface.
8. The portable formaldehyde detector according to claim 1, wherein the data interface (5) comprises a Micro USB data interface.
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| CN107596911A (en) * | 2017-10-24 | 2018-01-19 | 南开大学 | A kind of method using atmosphere organic pollutants such as metal-doped titanium deoxide catalyst thermocatalytic degradation of formaldehyde |
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