CN112198197A - Formaldehyde gas sensor module - Google Patents
Formaldehyde gas sensor module Download PDFInfo
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- CN112198197A CN112198197A CN202011090576.3A CN202011090576A CN112198197A CN 112198197 A CN112198197 A CN 112198197A CN 202011090576 A CN202011090576 A CN 202011090576A CN 112198197 A CN112198197 A CN 112198197A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
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- G01N27/046—Circuits provided with temperature compensation
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Abstract
The invention discloses a formaldehyde gas sensor module, which comprises: the formaldehyde sensor comprises a circuit board, a sensitive element for sensing formaldehyde, a heating element for enhancing the sensing effect of the sensitive element under the low-temperature condition, an analog circuit for amplifying and converting a detection signal of the sensitive element, a shell and a control device, wherein the sensitive element, the heating element and the analog circuit are all arranged on the circuit board, and the circuit board is arranged in the shell; the control device is connected with the sensitive element and the analog circuit through the first control circuit to acquire detection data, the control device is connected with the heating element through the second control circuit to control the heating element to operate, and the first control circuit and the second control circuit are arranged on the circuit board. The formaldehyde gas sensor module provided by the invention can sense and effectively detect the concentration of formaldehyde at low temperature, so that the working temperature of the formaldehyde sensor can be effectively reduced, the energy consumption is reduced, and the performance of the formaldehyde sensor is more stable and the service life is longer.
Description
Technical Field
The invention relates to the technical field of formaldehyde gas detection, in particular to a formaldehyde gas sensor module.
Background
Formaldehyde is colorless, but has stimulating effect on eyes and nose of human body, and belongs to toxic and harmful substances in indoor air. When the concentration of formaldehyde in the indoor air is more than 0.08mg/m3In addition, the eye red, itching, discomfort or pain in the throat, hoarseness, sneezing, chest distress, asthma, dermatitis, etc. may be caused. However, in newly decorated rooms, the decorative materials and furniture release a large amount of formaldehyde, so that the formaldehyde content in the room is high, and a lot of diseases can be caused to human bodies. Therefore, efficient detection of indoor formaldehyde concentration is required.
In the prior art, a formaldehyde sensor is usually used for detecting the indoor formaldehyde concentration in real time, and the formaldehyde sensor mainly comprises an electrochemical sensor, an optical sensor, a photogenic sensor and the like. The electrochemical sensor has the advantages of simple structure, low cost, stable product performance, detection range and resolution ratio which basically meet the detection requirements of indoor environment, but has the defects of more interfering substances and short service life; the optical sensor is expensive, large in size, not suitable for on-line real-time analysis, unstable in performance and lack of practicability. The optical sensor is expensive, large in size and not suitable for online real-time analysis; although the photo-biosensor is highly selected and responds to only a single gas, its performance is unstable due to the stability of the enzyme, and thus it is not practical. The semiconductor sensor is popular in the market due to simple working principle, short response time, simple manufacture and low cost. Therefore, most formaldehyde sensors in the market are semiconductor sensors, but the semiconductor sensors have obvious response to ppm and sub-ppm formaldehyde only at higher working temperature, so that the accuracy of the semiconductor formaldehyde sensors is poor.
In summary, how to provide a semiconductor formaldehyde sensor with low working temperature and high response strength is a problem to be solved urgently by those skilled in the art.
Disclosure of Invention
In view of this, the present invention provides a formaldehyde gas sensor module, which can sense and effectively detect the formaldehyde concentration at a low temperature, that is, can effectively reduce the operating temperature of the formaldehyde sensor, reduce energy consumption, and make the performance of the formaldehyde sensor more stable and the service life longer.
In order to achieve the above purpose, the invention provides the following technical scheme:
a formaldehyde gas sensor module comprising: the formaldehyde detector comprises a circuit board, a sensitive element for sensing formaldehyde, a heating element for enhancing the sensing effect of the sensitive element under the low-temperature condition, an analog circuit for amplifying and converting a detection signal of the sensitive element, a shell for fixing the circuit board and a control device, wherein the sensitive element, the heating element and the analog circuit are all arranged on the circuit board, and the circuit board is arranged in the shell;
the control device is connected with the sensitive element and the analog circuit through a first control circuit to acquire detection data, the control device is connected with the heating element through a second control circuit to control the heating element to operate, and the first control circuit and the second control circuit are arranged on the circuit board.
Preferably, the sensitive element is porous TiO2The nano material, the heating element is an ultraviolet lamp.
Preferably, the TiO is2Nano materialThe preparation method of the material comprises the following steps,
s1: mixing porous TiO2Dissolving nanotube powder in terpineol;
s2: the TiO dissolved by ultrasonic oscillation2Preparing the nanotube powder into a solvent, wherein the dissolving time is 10min-40 min;
s3: taking a proper amount of the solvent and uniformly coating the solvent on the interdigital electrode;
s4: carrying out high-temperature firing twice on the interdigital electrode;
s5: fixing the fired interdigital electrode on Al2O3On a substrate.
Preferably, said S4 includes,
s41: the interdigital electrode is raised from the normal temperature to 150-200 ℃ at the speed of 3-5 ℃/min, kept for 2-3 h and then cooled to the normal temperature;
s42: the interdigital electrode is raised from the normal temperature to 500-600 ℃ at the speed of 3-5 ℃/min, kept for 5-6 h and then cooled to the normal temperature.
Preferably, the ultraviolet light emits ultraviolet light with a wavelength of 350nm to 400 nm.
Preferably, the ultraviolet lamp vertically irradiates on the sensitive element, and the distance between the irradiation end of the ultraviolet lamp and the sensitive element is 1mm-20 mm.
Preferably, the first control circuit is provided with a voltage dividing resistor.
Preferably, the analog circuit includes three serially connected triodes, and the triodes are all soldered on the circuit board.
Preferably, the housing comprises an upper housing and a lower housing, and the upper housing and the lower housing are detachably connected.
Preferably, the shell is provided with an air inlet hole and an air outlet hole, and the air inlet hole and the air outlet hole are arranged in a staggered manner with the sensitive element.
When the formaldehyde gas sensor module provided by the invention is used, the control device can control the first control circuit to be conducted so as to switch on a power supply, constant voltage is input, the sensitive element can effectively sense formaldehyde, the resistance value of the sensitive element can be changed when formaldehyde exists, so that the current of the first control circuit is changed, but the detection signal of the sensitive element is weak, and the detection signal needs to be amplified and effectively converted through an analog circuit so that the control device can receive effective detection data. Meanwhile, the control device can control the second control circuit to be conducted, so that the heating element operates to heat the sensitive element, the sensitive element can effectively sense formaldehyde under the low-temperature condition, and the detection effect and the detection accuracy of the sensitive element are improved. Because the relevance exists between the resistance value of the sensitive element and the formaldehyde concentration, the formaldehyde concentration in the air can be obtained by converting the resistance value of the sensitive element through the detected resistance value of the sensitive element and a fitting function.
In conclusion, the formaldehyde gas sensor module provided by the invention can sense and effectively detect the formaldehyde concentration at a low temperature, so that the working temperature of the formaldehyde sensor can be effectively reduced, the energy consumption is reduced, the performance of the formaldehyde sensor is more stable, and the service life is longer.
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 embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic structural view of a formaldehyde gas sensor module according to the present invention;
fig. 2 is a circuit diagram of a formaldehyde gas sensor module.
In fig. 1-2:
the device comprises a circuit board 1, a sensing element 2, a heating element 3, an analog circuit 4, a shell 5, a first control circuit 6, a second control circuit 7, a divider resistor 8, a triode 9, an upper shell 10, a lower shell 11, an air inlet 12, an air outlet 13 and an external wire 14.
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.
The core of the invention is to provide a formaldehyde gas sensor module which can sense and effectively detect the concentration of formaldehyde at low temperature, namely, can effectively reduce the working temperature of the formaldehyde sensor and reduce energy consumption, so that the performance of the formaldehyde sensor is more stable and the service life of the formaldehyde sensor is longer.
Referring to fig. 1 and fig. 2, wherein fig. 1 is a schematic structural diagram of a formaldehyde gas sensor module according to the present invention; fig. 2 is a circuit diagram of a formaldehyde gas sensor module.
This embodiment provides a formaldehyde gas sensor group mould, includes: the formaldehyde-free formaldehyde detector comprises a circuit board 1, a sensitive element 2 for sensing formaldehyde, a heating element 3 for enhancing the sensing effect of the sensitive element 2 under a low-temperature condition, an analog circuit 4 for amplifying and converting a detection signal of the sensitive element 2, a shell 5 for fixing the circuit board 1 and a control device, wherein the sensitive element 2, the heating element 3 and the analog circuit 4 are all arranged on the circuit board 1, and the circuit board 1 is arranged in the shell 5; the control device is connected with the sensitive element 2 and the analog circuit 4 through the first control circuit 6 to obtain detection data, the control device is connected with the heating element 3 through the second control circuit 7 to control the operation of the heating element 3, and the first control circuit 6 and the second control circuit 7 are arranged on the circuit board 1.
It should be noted that the control device may be configured as an electronic control switch, the electronic control switch is connected to the circuit board 1, the sensing element 2, the heating element 3 and the analog circuit 4, and the electronic control switch may control the opening and closing of the device by controlling the first control circuit 6 and the second control circuit 7. An electrically controlled switch may be provided on the housing 5 for easy operation by a user. An external wire 14 can be welded on the circuit board 1, and the external wire 14 is used for being connected with an external power supply, so that power is supplied to the whole equipment, an electric signal is transmitted, and the concentration of formaldehyde is effectively measured.
The shapes, structures, positions and the like of the circuit board 1, the sensitive element 2, the heating element 3, the analog circuit 4, the shell 5 and the control device can be determined according to actual conditions and actual requirements in the actual application process.
When the formaldehyde gas sensor module provided by the invention is used, the control device can control the first control circuit 6 to be conducted so as to switch on a power supply, constant voltage is input, the sensitive element 2 can effectively sense formaldehyde, when formaldehyde exists, the resistance value of the sensitive element 2 can be changed, so that the current of the first control circuit 6 is changed, but the detection signal of the sensitive element 2 is weak, and the detection signal needs to be amplified and effectively converted through the analog circuit 4, so that the control device can receive effective detection data. Meanwhile, the control device can control the second control circuit 7 to be conducted, so that the heating element 3 operates to heat the sensitive element 2, the sensitive element 2 can effectively sense formaldehyde under the low-temperature condition, and the detection effect and the detection accuracy of the sensitive element 2 are improved. Because the relevance exists between the resistance value of the sensitive element 2 and the formaldehyde concentration, the formaldehyde concentration in the air can be obtained by converting the resistance value of the sensitive element 2 through the detected resistance value of the sensitive element 2 and the fitting function.
In conclusion, the formaldehyde gas sensor module provided by the invention can sense and effectively detect the formaldehyde concentration at a low temperature, so that the working temperature of the formaldehyde sensor can be effectively reduced, the energy consumption is reduced, the performance of the formaldehyde sensor is more stable, and the service life is longer.
Based on the above embodiment, it is preferable that the sensing element 2 is porous Al2O3Nanomaterial, heating element 3 is an ultraviolet lamp.
In addition, the device is prepared by using TiO2Nano gas-sensitive material and irradiating TiO with ultraviolet lamp2The mode of the nano gas-sensitive material can greatly reduce that of the semiconductor sensorThe working temperature improves the loudness, precision and selectivity of the semiconductor sensor, so that the device can effectively sense formaldehyde at a lower working temperature. And, since the sensing element 2 is porous TiO2The nano material and the porous structure can effectively increase the contact area between the sensitive element 2 and formaldehyde and improve the induction effect of the sensitive element 2.
Preferably, TiO2The preparation method of the nano material comprises the following steps,
s1: mixing porous TiO2Dissolving nanotube powder in terpineol;
s2: dissolving TiO by ultrasonic oscillation2Preparing the nanotube powder into a solvent, wherein the dissolving time is 10min-40 min;
s3: taking a proper amount of solvent to be uniformly smeared on the interdigital electrode;
s4: carrying out high-temperature firing on the interdigital electrode for two times;
s5: fixing the fired interdigital electrode on Al2O3On a substrate.
It should be noted that the ultrasonic oscillation can ensure TiO2The nanotube powder is more uniformly dissolved, and the two high-temperature firing steps are performed to make TiO more uniform2The nano material is better fixed on Al2O3On the substrate, ensuring TiO2The nanometer material is not easy to fall off, namely the sensor can be prevented from being caused by TiO2The nano material falls off and fails.
Preferably, S4 includes, in combination,
s41: raising the temperature of the interdigital electrode from the normal temperature to 150-200 ℃ at the speed of 3-5 ℃/min, keeping the temperature for 2-3 h, and then cooling to the normal temperature;
s42: raising the temperature of the interdigital electrode from the normal temperature to 500-600 ℃ at the speed of 3-5 ℃/min, keeping the temperature for 5-6 h, and then cooling to the normal temperature.
Wherein, the parameters of the two times of high-temperature firing can be set as follows: raising the temperature from normal temperature to 150 ℃ at the speed of 3 ℃/min, reducing the temperature to the normal temperature after keeping the temperature for 2h, then raising the temperature to 500 ℃ at the speed of 3 ℃/min, and reducing the temperature to the normal temperature after keeping the temperature for 5h, thereby better fixing the TiO2Nano material, and not on TiO2Manufacture of nano materialAnd becomes damaged.
Based on the above embodiment, it is preferable that the ultraviolet lamp emits ultraviolet rays having a wavelength of 350nm to 400 nm.
It should be noted that the ultraviolet lamp may be a small ultraviolet lamp having a length of about 1cm and a width of about 0.3 cm. Irradiating the TiO with ultraviolet light because the wavelength of the ultraviolet light is less than the semiconductor oxide gap2When the nano material is used, TiO is excited2The nanometer material generates electron hole pairs to assist TiO2The nanometer material increases the sensitivity of the nanometer material to formaldehyde gas, thereby reducing the working temperature and leading TiO to2The nano material can work without being heated to high temperature, so that the service life of the sensor can be effectively prolonged.
Preferably, the ultraviolet lamp vertically irradiates on the sensitive element 2, and the distance between the irradiation end of the ultraviolet lamp and the sensitive element 2 is 1mm-20 mm. The ultraviolet lamp is close in distance and perpendicular to the radiation sensitive element 2, so that light can be more concentrated, and the ultraviolet light can more effectively excite the sensitive element 2.
It should be noted that the sensing element 2 of the formaldehyde gas sensor module provided by the invention is specially treated porous TiO2The combination of the nanometer material and the ultraviolet lamp as the heating element 3 can have good sensitivity and selectivity to low-concentration formaldehyde, and simultaneously, the working temperature of the gas sensor can be reduced, the energy consumption is reduced, so that the sensor has stable performance and long service life.
In addition to the above embodiments, it is preferable that the first control circuit 6 is provided with the voltage dividing resistor 8.
It should be noted that, when the sensor 2 of the semiconductor sensor is not subjected to any treatment, the sensitivity of the sensor 2 to formaldehyde gas is not strong, so that the resistance value of the sensor 2 is relatively large, and is about 800k Ω. However, when the sensor 2 is irradiated by ultraviolet rays, the sensitivity of the sensor 2 increases, the resistance value becomes very small, about 20k Ω, so the resistance value variation range of the sensor 2 is relatively large, and in order to avoid circuit burnout caused by excessive current, a large resistor with a large resistance value needs to be connected in series for voltage division, so a voltage dividing resistor 8 needs to be arranged on the first control circuit 6 to protect the circuit, for example, the voltage dividing resistor 8 can be set to 100M Ω -1G Ω. The circuit board 1 may be disposed inside the housing 5, and the sensing element 2, the heating element 3, the analog circuit 4, the voltage dividing resistor 8, and the external connection wire 14 may be disposed on the circuit board 1.
Preferably, the analog circuit 4 includes three serially connected transistors 9, and the transistors 9 are all soldered on the circuit board 1.
It should be noted that, since the resistance of the voltage dividing resistor 8 is too large, the current of the first control circuit 6 during operation is too small, and therefore the current needs to be amplified so that the current is within the normal measurement range, and therefore the current needs to be amplified by the analog circuit 4. The analog circuit 4 is formed by connecting three triodes 9 in series, the three triodes 9 are connected to the circuit board 1 in a welding mode, the amplification effect of the three triodes 9 is better, and the amplification effect of the circuit can be effectively ensured. And, all three triodes 9 can be welded on the circuit board 1, so that the whole structure of the device is more compact, the volume is smaller, and the manufacturing process is simplified.
On the basis of the above embodiment, it is preferable that the housing 5 includes the upper housing 10 and the lower housing 11, and the upper housing 10 and the lower housing 11 are detachably coupled.
It should be noted that, if the parts in the housing 5 are damaged, the upper housing 10 and the lower housing 11 can be disassembled to replace the internal parts, and the new parts can be used with other undamaged parts to prolong the service life of the device.
In the actual application process, the shape, size, structure, material, connection mode and the like of the upper shell 10 and the lower shell 11 can be determined according to the actual situation and the actual requirement.
Preferably, the shell 5 is provided with an air inlet hole 12 and an air outlet hole 13, and the air inlet hole 12 and the air outlet hole 13 are arranged in a staggered manner with the sensing element 2.
Note that the air inlet hole 12 and the air outlet hole 13 are provided in the housing 5, for the purpose of facilitating the circulation of the air, for example, the air inlet hole 12 and the air outlet hole 13 may be provided on opposite sides of the housing 5. In addition, the sensing element 2 is arranged in a staggered manner with the air inlet hole 12 and the air outlet hole 13, so that the sensing effect of the sensing element 2 is prevented from being influenced by dust easily accumulated on the surface of the sensing element 2 when the sensing element 2 is over against the air inlet hole 12 and the air outlet hole 13.
The positions, sizes, shapes, etc. of the inlet holes 12 and the outlet holes 13 can be determined according to actual conditions and actual requirements.
In order to further explain the composition and the using process of the formaldehyde gas sensor module provided by the present invention, the following description is given by way of example.
The sensitive element 2 of the formaldehyde gas sensor module provided by the invention is made of porous TiO2Dissolving nanotube powder in terpineol, ultrasonically oscillating for 10-40 min to obtain a solvent, uniformly coating a small amount of the solvent on the interdigital electrode with a spoon, firing the interdigital electrode at high temperature twice, and fixing the interdigital electrode on Al2O3On a substrate to form the sensitive element 2 of the formaldehyde sensor. Finally, the sensing element 2 is welded on the circuit board 1 by using a gas soldering iron, and the position of the sensing element 2 is ensured to be staggered with the positions of the air inlet hole 12 and the air outlet hole 13.
Wherein, twice high-temperature firing operations comprise: firstly, the temperature is increased from the normal temperature to 150 ℃ at the speed of 3 ℃/min, the temperature is reduced to the normal temperature after the temperature is maintained for 2h, then the temperature is increased from the normal temperature to 500 ℃ at the speed of 3 ℃/min, the temperature is reduced to the normal temperature after the temperature is maintained for 5 h.
In addition, the heating element 3 is set as an ultraviolet lamp, and the wavelength of ultraviolet rays radiated by the ultraviolet lamp is 350nm-400 nm. The distance between the ultraviolet lamp and the sensitive element 2 is 1mm-20mm, and the ultraviolet lamp vertically irradiates the sensitive element 2 to effectively excite TiO2The nanometer material generates electron hole pairs to assist TiO2The nanometer material increases the sensitivity of the nanometer material to formaldehyde gas, thereby reducing the working temperature and leading TiO to2The nano material can work without being heated to high temperature, so that the service life of the sensor can be effectively prolonged.
Porous nanotube TiO adopted by the invention2The manufacturing method of the material is simple, the needed material is low in price and small in dosage, and the used ultraviolet lamp is small in size, and the ultraviolet lamp is arranged in the shell 5 and can shield the shell 5And the ultraviolet rays do not cause harm to human bodies. Simultaneously, the nano-tube TiO is irradiated by ultraviolet rays2Material of making nanotube TiO2The material has good sensitivity and selectivity to low-concentration formaldehyde, and meanwhile, the working temperature of the sensitive element 2 can be greatly reduced, the energy consumption is reduced, and the sensor has stable performance and long service life.
When the device is used, the electric control switch of the first control circuit 6 where the sensitive element 2 is located can be pressed down to switch on a power supply, constant voltage is input, the sensitive element 2 can sense formaldehyde gas and generate weak electric signals, and the weak electric signals are amplified to obtain more appropriate current after the electric signals output by the sensitive element 2 pass through the three triodes 9. According to the known resistance Ro of the voltage dividing resistor 8, the current value I1 of the first control circuit 6 at this time, the voltage value Uo of the constant voltage, and the like, the resistance R1 of the sensing element 2 without irradiating the ultraviolet lamp can be calculated, which is the zero adjustment value of the resistance of the sensing element 2 at this time, that is, the situation that the resistance of the sensing element 2 is the maximum and the current of the first control circuit 6 is the minimum.
The electrically controlled switch of the second control circuit 7 in which the heating element 3 is located can then be pressed, so that the second control circuit 7 is switched on, so that the ultraviolet lamp in the heating element 3 is lit. Ultraviolet irradiation of TiO nanotubes2When the material is prepared, the photon energy of ultraviolet ray can make the nanotube TiO2The material generates electron-hole pairs to enhance the nanotube TiO2Conductivity of the material to make nanotube TiO2The resistance of the material is reduced until the TiO of the nanotube is reduced2After the resistance of the material is stabilized, the current value I2 of the first control circuit 6 is measured, and the resistance Rx of the sensor 2 under the irradiation of the ultraviolet lamp, that is, Rx ═ Uo/I2-Ro, can be calculated according to the known resistance Ro of the voltage dividing resistor 8, the measured current value I2, the constant voltage value Uo, and the like.
Because there is a fitting function relationship between the formaldehyde concentration and the response of the sensor 2, the current formaldehyde concentration, i.e., C ═ f (rx), can be calculated by the fitting function. Wherein C is the formaldehyde concentration, Rx is the response of the sensor to formaldehyde, and is the resistance value of the sensitive element 2 when the ultraviolet lamp is irradiated, so the device can effectively detect the formaldehyde concentration.
It should be noted that, in the present application, the first control circuit 6 and the second control circuit 7 are mentioned, wherein the first and the second are only used for distinguishing the difference of the positions, and are not sequentially distinguished.
It should be noted that the directions and positional relationships indicated by "upper" and "lower" in the present application are based on the directions and positional relationships shown in the drawings, and are only for the convenience of simplifying the description and facilitating the understanding, but do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and thus, should not be construed as limiting the present invention.
The embodiments in the present description 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. Any combination of all embodiments provided by the present invention is within the scope of the present invention, and will not be described herein.
The formaldehyde gas sensor module provided by the invention is described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (10)
1. A formaldehyde gas sensor module, comprising: the formaldehyde detector comprises a circuit board (1), a sensitive element (2) for sensing formaldehyde, a heating element (3) for enhancing the sensing effect of the sensitive element (2) under a low-temperature condition, an analog circuit (4) for amplifying and converting a detection signal of the sensitive element (2), a shell (5) for fixing the circuit board (1) and a control device, wherein the sensitive element (2), the heating element (3) and the analog circuit (4) are all arranged on the circuit board (1), and the circuit board (1) is arranged in the shell (5);
the control device is connected with the sensitive element (2) and the analog circuit (4) through a first control circuit (6) to acquire detection data, the control device is connected with the heating element (3) through a second control circuit (7) to control the heating element (3) to operate, and the first control circuit (6) and the second control circuit (7) are arranged on the circuit board (1).
2. Formaldehyde gas sensor module according to claim 1, characterized in that the sensor element (2) is a porous TiO2The nano material, the heating element (3) is an ultraviolet lamp.
3. The formaldehyde gas sensor module as claimed in claim 2, wherein the TiO is provided in a form of a TiO2The preparation method of the nano material comprises the following steps,
s1: mixing porous TiO2Dissolving nanotube powder in terpineol;
s2: the TiO dissolved by ultrasonic oscillation2Preparing the nanotube powder into a solvent, wherein the dissolving time is 10min-40 min;
s3: taking a proper amount of the solvent and uniformly coating the solvent on the interdigital electrode;
s4: carrying out high-temperature firing twice on the interdigital electrode;
s5: fixing the fired interdigital electrode on Al2O3On a substrate.
4. The formaldehyde gas sensor module as claimed in claim 3, wherein the S4 includes,
s41: the interdigital electrode is raised from the normal temperature to 150-200 ℃ at the speed of 3-5 ℃/min, kept for 2-3 h and then cooled to the normal temperature;
s42: the interdigital electrode is raised from the normal temperature to 500-600 ℃ at the speed of 3-5 ℃/min, kept for 5-6 h and then cooled to the normal temperature.
5. The formaldehyde gas sensor module according to any one of claims 2 to 4, wherein the ultraviolet lamp emits ultraviolet light having a wavelength of 350nm to 400 nm.
6. The formaldehyde gas sensor module as claimed in claim 5, wherein the UV lamp irradiates the sensor element (2) perpendicularly, and the distance between the irradiating end of the UV lamp and the sensor element (2) is 1mm-20 mm.
7. The formaldehyde gas sensor module as claimed in any of claims 1 to 4, wherein the first control circuit (6) is provided with a voltage-dividing resistor (8).
8. The formaldehyde gas sensor module according to claim 7, wherein the analog circuit (4) comprises three serially connected transistors (9), and the transistors (9) are all soldered on the circuit board (1).
9. The formaldehyde gas sensor module as claimed in any of claims 1 to 4, wherein the housing (5) comprises an upper housing (10) and a lower housing (11), the upper housing (10) and the lower housing (11) being detachably connected.
10. The formaldehyde gas sensor module as claimed in any of claims 1 to 4, wherein the housing (5) is provided with an air inlet (12) and an air outlet (13), and the air inlet (12) and the air outlet (13) are both arranged in a staggered manner with respect to the sensor (2).
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011090576.3A CN112198197A (en) | 2020-10-13 | 2020-10-13 | Formaldehyde gas sensor module |
| PCT/CN2021/110750 WO2022078028A1 (en) | 2020-10-13 | 2021-08-05 | Formaldehyde gas sensor module |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011090576.3A CN112198197A (en) | 2020-10-13 | 2020-10-13 | Formaldehyde gas sensor module |
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| CN112198197A true CN112198197A (en) | 2021-01-08 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022078028A1 (en) * | 2020-10-13 | 2022-04-21 | 海南聚能科技创新研究院有限公司 | Formaldehyde gas sensor module |
Citations (22)
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| WO2022078028A1 (en) | 2022-04-21 |
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