TWM566326U - Portable gas detection device - Google Patents

Abstract

A portable gas detecting device includes: at least one detecting chamber having at least one air inlet and at least one air outlet; at least one gas sensor disposed in the detecting chamber to detect the chamber Gas is detected; and at least an actuator is disposed in the detection chamber, and the piezoelectric actuator is applied with a constant motion signal to generate a resonance, so that the gas outside the detection chamber is introduced for sampling, and the actuation The device is driven by an instantaneous sampling pulse to control the flow of trace gas into the detection chamber to form a stable airflow environment, so that the gas sensor dissolves or bonds on the reaction material through gas molecules passing through the surface thereof in a stable airflow environment. It forms an immediate response and ensures detection sensitivity.

Description

Portable gas detection device

The present invention relates to a portable gas detecting device, and more particularly to a portable gas detecting device that uses an instantaneous sampling pulse for gas detection.

Modern people are paying more and more attention to the gas quality around them, such as carbon monoxide, carbon dioxide, volatile organic compounds (VOC), PM2.5, nitrogen monoxide, sulfur monoxide, etc., these gases in the environment. Exposure can affect human health, and even endanger life. Therefore, the quality of environmental gases has attracted the attention of all countries, and it is an issue that needs urgent attention.

How to confirm the quality of gas, it is feasible to use a gas sensor to detect ambient gas. If it can provide detection information immediately, it can alert people in the environment to prevent or escape immediately, and avoid exposure to the environment. Harmful gases cause human health effects and injuries, and the use of gas sensors to detect ambient gas quality is a very good application.

At present, the gas sensor detects the gas based on the reaction material that is guided to the surface of the gas, and as shown in FIG. 1, the gas sensor 2 is usually disposed in an independently isolated detection chamber 1. The detection is performed to prevent the gas from being interfered by other external factors, and the detecting chamber 1 is provided with an air inlet 1a and an air outlet 1b, so that the external gas can gradually converge naturally from the air inlet 1a and diffuse to the gas. The surface of the sensor 2 is subjected to reaction detection, and then the gas outlet 1b is exhausted to complete the gas detection. However, the gas is detected by the gas sensor 2 and introduced into the detecting chamber 1 by natural convection. The gas guiding time is too long, which indirectly affects the detection efficiency of the gas sensor 2, and cannot be detected immediately. the goal of.

In order to overcome the problem of the above-mentioned gas movement reaching the instant detection, the detection chamber 1 is equipped with a fan, and the conventional fan is a conventional motor shaft type driving mode, which can accelerate the gas conduction into the detection chamber 1 In this way, the detection sensitivity of the gas sensor 2 is distorted as the gas flow rate increases or the chaotic air flow is affected. This is because the gas sensor 2 cannot immediately capture the reaction material in which the gas molecules are dissolved or bonded to the surface, and the grabbing is performed. The reaction material of the gas molecule also requires some reaction time, so the gas flow over the surface of the gas sensor 2 must require a stable gas flow, so the fan is used to increase the gas flow rate, which is limited by factors such as high flow rate or chaotic flow rate. Not applicable; in addition, the fan is used to increase the gas flow rate. When the fan starts, it needs an acceleration to drive the fan, so that the fan reaches a certain speed and generates a higher flow rate. When the fan stops, it also needs a deceleration to stop the fan from rotating. Initiating or stopping requires an acceleration or deceleration inertial drive mode, so the fan must reach Instant rotation / stop will take some time, so take a fan to increase air flow in such manner, for immediate detection is not applicable, it is how to achieve real-time mobile gas detection problem is urgently needed to overcome the problem.

The gas sensor 2 achieves accurate sensitivity and immediate response detection for gas detection, which is an important subject to be overcome in this case, and is miniaturized in order to facilitate the detection of the gas sensor and the detection chamber to facilitate portability. The application that can be detected anywhere and anytime is also an important subject of the new research and development of this case. If the fan is used to increase the gas flow rate, the volume of the fan is also difficult to be miniaturized. Therefore, the present invention provides a portable gas detecting device. The characteristics of instant detection and sampling are important topics in the new research and development of this case.

The main purpose of the present invention is to provide a portable gas detecting device comprising at least one detecting chamber, at least one gas sensor and at least an actuator, wherein actuation of the actuator can drive the drainage to improve detection efficiency, and The actuator is pulse-driven to start the instantaneous sampling in the detection chamber, and can control the flow of trace gas into the detection chamber to form a stable airflow environment, so that the gas sensor dissolves the gas molecules passing through the surface in a stable airflow environment or The bond reacts on the reaction material to achieve accurate sensitivity and immediate response detection of the gas sensor, and the actuator is separated from the diaphragm in the detection chamber to separate the gas sensor from the actuator to avoid mutual interference. Moreover, the structure of the actuator is miniaturized, and the assembly is set in the device to miniaturize the entire device, so as to facilitate portable detection of anytime, anywhere.

A generalized implementation of the present invention is a portable gas detecting device comprising: at least one detecting chamber having at least one air inlet and at least one air outlet; at least one gas sensor disposed in the detecting chamber Detecting gas in the detection chamber; and at least an actuator disposed in the detection chamber, the at least actuator comprising a piezoelectric actuator, the piezoelectric actuator being applied The signal generates a resonance effect, so that the external gas of the detection chamber is introduced for sampling, and the actuator is driven by the instantaneous sampling pulse to control the flow of trace gas into the detection chamber to form a stable airflow environment, so that the gas sensor is in a stable airflow. In the environment, gas molecules passing through the surface thereof are dissolved or bonded to react on the reaction material to form an immediate response to ensure detection sensitivity.

Some exemplary embodiments embodying the features and advantages of the present invention are described in detail in the following description. It is to be understood that the present invention is capable of various modifications in various embodiments, and is not intended to limit the scope of the invention.

Please refer to FIG. 2 and FIG. 3 , the present invention provides a portable gas detecting device comprising at least one detecting chamber 1 , at least one gas sensor 2 and at least an actuator 3 , and implemented as shown in FIG. 3 . In the example, only one detection chamber 1, one gas sensor 2 and one actuator 3 are described, but not limited thereto. In this embodiment, the detecting chamber 1 is disposed in the device to form a separate isolation chamber. The interior of the detecting chamber 1 is partitioned by a partition 13 to form a first compartment 11 and a second compartment 12, And at least one air inlet 14 and at least one air outlet 15 are provided, but not limited thereto. The air inlet 14 communicates with the first compartment 11, the air outlet 15 communicates with the second compartment 12, and the partition 13 has a communication port 131 to communicate the first compartment 11 and the second compartment 12, so that the detection chamber The inside of the air inlet 14, the first compartment 11, the communication port 131, the second compartment 12, and the air outlet 15 constitute a gas passage for a single gas supply (the path indicated by the arrow in Fig. 3). The gas sensor 2 is disposed in the first compartment 11, so that the gas outside the detection chamber 1 can pass through the inlet port 14 and enter the surface of the gas sensor 2 for detection. The gas sensor 2 can be at least one of an oxygen sensor, a carbon monoxide sensor, a carbon dioxide sensor, a temperature sensor, an ozone sensor, and a volatile organic sensor, or a combination thereof.

The actuator 3 is disposed between the second compartment 12 and the partition 13 . Of course, a plurality of actuators 3 may be disposed between the second compartment 12 and the partition 13 for gas guiding. In the embodiment of Fig. 3, only one actuator 3 is illustrated for gas conduction, but not limited thereto. In the present embodiment, the actuator 3 is fixed between the second compartment 12 and the partition 13 to close the second compartment 12, and the operation of the gas guided by the actuator 3 is enabled. A negative pressure is formed in a compartment 11 to allow gas to be introduced into the first compartment 11 from the air inlet 14, detected by the surface of the gas sensor 2, and then passed through the communication port 131 into the second compartment 12, and then transmitted through The actuated pilot gas of the actuator 3 is pushed into the second compartment 12 and finally discharged by the air outlet 15 to constitute a single direction gas guide. The gas sensor 2 is disposed in the first compartment 11 and is separated from the actuator 3 by the partition plate 13. Therefore, when the actuator 3 is actuated, a heat source is generated due to the vibration thereof, and the partition plate 13 can These heat sources are suppressed to affect the detection sensitivity of the gas sensor 2. Moreover, the detecting chamber 1 is disposed in the device to form a separate isolation chamber, which can not only isolate other interference factors (such as some gas pollution generated in the device, interference substances such as heat sources, etc.), but also affect the gas sensor 2, Through the arrangement of the actuator 3, the gas is introduced and led out, the gas is sent to the surface of the gas sensor 2 for monitoring, the detection efficiency of the gas sensor is improved, and the gas outside the portable gas detecting device is monitored. The characteristics of the required monitoring gas in the detection chamber 1 are made equal to the characteristics of the gas outside the device, and other interference factors are isolated.

To understand the characteristics of the above-mentioned portable gas detecting device, the following describes the structure and operation of the actuator 3:

Referring to FIG. 4A to FIG. 5D, the actuator 3 is a gas pump, and includes an air inlet plate 31, a resonant plate 32, a piezoelectric actuator 33, and an insulating sheet 34, which are sequentially stacked. a conductive sheet 35; the air inlet plate 31 has at least one air inlet hole 31a, at least one bus bar hole 31b, and a confluence chamber 31c. The number of the air inlet holes 31a and the bus bar holes 31b are the same, in this embodiment. The air intake hole 31a and the bus bar hole 31b are exemplified by the number of four, and are not limited thereto; the four air inlet holes 31a respectively penetrate the four bus bar holes 31b, and the four bus bar holes 31b merge to the confluence The chamber 31c.

The resonator piece 32 can be assembled to the air inlet plate 31 through a bonding manner. The resonator piece 32 has a hollow hole 32a, a movable portion 32b and a fixing portion 32c. The hollow hole 32a is located at the center of the resonance plate 32. And corresponding to the confluence chamber 31c of the air intake plate 31, and a region provided around the hollow hole 32a and opposed to the confluence chamber 31c is a movable portion 32b, and is provided on the outer peripheral portion of the resonance piece 32 to be attached. The air intake plate 31 is a fixing portion 32c.

The piezoelectric actuator 33 includes a suspension plate 33a, an outer frame 33b, at least one bracket 33c, a piezoelectric element 33d, at least one gap 33e and a convex portion 33f. The suspension plate 33a is a square shape. The suspension plate has a first surface 331a and a second surface 332a opposite to the first surface 331a. The outer frame 33b is disposed around the circumference of the suspension plate 33a, and the outer frame 33b has a pair of matching surfaces 331b and a lower surface 332b. At least one bracket 33c is connected between the suspension plate 33a and the outer frame 33b to provide a supporting force for elastically supporting the suspension plate 33a, wherein the gap 33e is a gap between the suspension plate 33a, the outer frame 33b and the bracket 33c for The gas passes.

In addition, the first surface 331a of the suspension plate 33a has a convex portion 33f. In the embodiment, the convex portion 33f is etched by the etching process of the peripheral edge of the convex portion 33f and adjacent to the bracket 33c to be suspended. The convex portion 33f of the plate 33a is higher than the first surface 331a to form a stepped structure.

Further, as shown in FIG. 5A, the suspension plate 33a of the present embodiment is formed by press forming to be recessed downward, and the depression distance thereof can be adjusted by at least one bracket 33c formed between the suspension plate 33a and the outer frame 33b to be suspended. Both the surface of the convex portion 33f on the plate 33a and the combined surface 331b of the outer frame 33b form a non-coplanar, that is, the surface of the convex portion 33f will be lower than the combined surface 331b of the outer frame 33b, and the suspension plate 33a The second surface 332a is lower than the lower surface 332b of the outer frame 33b, and the piezoelectric element 33d is attached to the second surface 332a of the suspension plate 33a, disposed opposite to the convex portion 33f, and the piezoelectric element 33d is applied with a driving voltage due to the piezoelectric effect. The deformation is caused to cause the suspension plate 33a to bend and vibrate. A small amount of adhesive is applied to the assembly surface 331b of the outer frame 33b, and the piezoelectric actuator 33 is bonded to the fixing portion 32c of the resonance piece 32 by heat pressing. In turn, the piezoelectric actuator 33 is combined with the resonant plate 32.

In addition, the insulating sheet 34 and the conductive sheet 35 are all thin frame-shaped sheets, which are sequentially stacked under the piezoelectric actuator 33. In the present embodiment, the insulating sheet 34 is attached to the lower surface 332b of the outer frame 33b of the piezoelectric actuator 33.

Continuing to refer to FIG. 5A, the air intake plate 31, the resonant plate 32, the piezoelectric actuator 33, the insulating sheet 34, and the conductive sheet 35 of the actuator 3 are sequentially stacked and combined, and the first surface 331a of the suspension plate 33a is suspended. Forming a chamber spacing g with the resonator piece 32, the chamber spacing g will affect the transmission effect of the actuator 3, so maintaining a fixed chamber spacing g is important for providing stable transmission efficiency to the actuator 3. . The actuator 3 of the present invention uses a punching method for the suspension plate 33a to be recessed downward so that both the first surface 331a of the suspension plate 33a and the assembly surface 331b of the outer frame 33b are non-coplanar, that is, the suspension plate. The first surface 331a of the 33a will be lower than the assembly surface 331b of the outer frame 33b, and the second surface 332a of the suspension plate 33a is lower than the lower surface 332b of the outer frame 33b, so that the suspension plate 33a of the piezoelectric actuator 33 is recessed. A space is formed in the chamber 36 with an adjustable pitch, and the structure of the chamber 36 is formed by directly forming the cavity 33 by forming the recessed plate 33a of the piezoelectric actuator 33. The required chamber space 36 can be completed by adjusting the recessed distance of the suspension plate 33a of the piezoelectric actuator 33, which simplifies the structural design of the adjustment chamber space, and also achieves the advantages of simplifying the process and shortening the process time.

5B to 5D are diagrams showing the operation of the actuator 3. Referring to FIG. 5B, the piezoelectric element 33d of the piezoelectric actuator 33 is subjected to a driving voltage to generate a deformation-driven suspension plate 33a. The lower displacement, at this time, the volume of the chamber space 36 is increased, a negative pressure is formed in the chamber space 36, and the gas in the confluence chamber 31c is taken into the chamber space 36, and the resonance piece 32 is affected by the resonance principle. Synchronous downward displacement increases the volume of the confluence chamber 31c, and due to the relationship of the gas in the confluence chamber 31c into the chamber space 36, the confluence chamber 31c is also in a negative pressure state, and further passes through the manifold hole 31b. The air inlet hole 31a sucks the gas into the confluence chamber 31c; referring to FIG. 5C, the piezoelectric element 33d drives the suspension plate 33a to move upward, compressing the chamber space 36, forcing the gas in the chamber space 36 to pass through the gap 33e. The downward transmission is performed to achieve the effect of transmitting gas. At the same time, the resonator piece 32 is also displaced upward by the suspension plate 33a due to resonance, and the gas in the confluence chamber 31c is synchronously pushed to move into the chamber space 36; finally, refer to the 5D. Figure, when the suspension board When the 33a is driven downward, the resonator piece 32 is also driven to be displaced downward, and the resonator piece 32 at this time will move the gas in the compression chamber space 36 toward the gap 33e, and raise the volume in the confluence chamber 31c. The gas can be continuously collected in the confluence chamber 31c through the intake hole 31a and the bus bar hole 31b, and the above steps are continuously repeated, so that the actuator 3 can continuously enter the gas from the intake hole 31a, and then the gap The 33e is transmitted downward to achieve the function of transmitting the gas to the gas sensor 2 to provide gas to the gas sensor 2 for detection and improve detection efficiency.

Continuing to refer to FIG. 5A, another embodiment of the actuator 3 allows the actuator 3 to be a microelectromechanical system gas pump in a microelectromechanical manner, wherein the air inlet plate 31, the resonant plate 32, and the piezoelectric element The actuating member 33, the insulating sheet 34, and the conductive sheet 35 can be made through a surface micromachining technique to reduce the volume of the actuator 3.

As can be seen from the above description, the present invention utilizes an actuator and a gas sensor in combination with a structural design for gas detection in a detection chamber. The actuator and the gas sensor are miniaturized to form a portable gas detecting device. For example, the actuator and the gas sensor are combined with the detection chamber in a mobile device (as shown in FIG. 3) to form a portable gas detecting device, which is suitable for the user to carry around. The gas in the environment can be detected anytime and anywhere, and the portable gas detection device has the requirements of accurate sensitivity and instant response detection for gas detection. Therefore, the actuation of the actuator 3 can drive the drainage and improve the case. The detection efficiency is matched with the actuator to start sampling instantaneously by pulse driving, and the trace gas is controlled to flow into the detection chamber to form a stable airflow, and the gas detection has accurate sensitivity and immediate response detection, that is, the actuator of the present invention 3 only needs to be activated by the piezoelectric actuator 33 when the constant motion signal is applied, and can be stopped instantaneously when the constant motion signal is not applied, completely replacing the traditional fan activation. When the motion or the stop is required, an acceleration or deceleration inertial driving mode is required, and the piezoelectric actuator 33 of the actuator 3 is activated by the application of the constant motion signal to generate a resonance action, so that the resonance action causes the detection chamber 1 to be detected. The external gas is introduced for sampling, and the detection chamber 1 can be generally sampled for continuous sampling or intermittent sampling, while the sampling of the embodiment of the present invention adopts intermittent sampling and adopts an intermittent sampling method for instantaneous sampling. Therefore, the actuator 3 performs a pulse driving method of driving an instantaneous sampling as shown in FIG. 6, and the actuator 3 can start or stop the pulse control of the sampling in a very short time, and the starting time of the sampling pulse at this instant (T _on The ratio of the stop time (T _off ) is 0.001 to 0.5, and the ratio of the start time (T _on ) to the stop time (T _off ) of the instantaneous sampling pulse is preferably 0.01 to 0.2, that is, the detection chamber 1 can be driven immediately. Internal sampling, and let the outside air of the detection chamber 1 be sucked in by the air inlet 14 to form a stable airflow environment, so that the gas sensor 2 dissolves or bonds the gas molecules passing through the surface thereof in the reaction material in a stable airflow environment. The upper reaction forms an immediate response to ensure detection sensitivity, effectively avoiding confusion or high flow rate and affecting the distortion of the sensitivity of the gas sensor 2.

In summary, the present invention provides a portable gas detecting device, which is driven by the actuator 3 to drive the drainage, improve the detection efficiency, and cooperate with the actuator to start sampling instantaneously by pulse driving, and control the flow of trace gas into the Detector. A stable airflow is formed in the measuring chamber to achieve accurate sensitivity and immediate response detection of the gas sensor, and the utility model has the advantages of miniaturization and portable portable detection at any time and anywhere, and the actuator passes through the detection chamber. Separately arranged, the gas sensor and the actuator are separated from each other to avoid mutual interference, and the structure of the actuator is miniaturized, and the assembly is arranged in the device to miniaturize the entire device, so as to facilitate portable and anytime, anywhere. The detection application achieves the purpose of being portable, always, and anywhere, and is highly industrially usable.

This case has been modified by people who are familiar with the technology, but it is not intended to be protected by the scope of the patent application.

1‧‧‧Detection chamber
1a‧‧‧air inlet
1b‧‧‧ air outlet
11‧‧‧First compartment
12‧‧‧ second compartment
13‧‧‧Baffle
131‧‧‧Connected
14‧‧‧air inlet
15‧‧‧ air outlet
2‧‧‧ gas sensor
3‧‧‧Actuator
31‧‧‧Air intake plate
31a‧‧‧Air intake
31b‧‧‧ bus bar hole
31c‧‧‧ confluence chamber
32‧‧‧Resonance film
32a‧‧‧ hollow hole
32b‧‧‧movable department
32c‧‧‧ fixed department
33‧‧‧ Piezo Actuator
33a‧‧‧suspension plate
331a‧‧‧ first surface
332a‧‧‧ second surface
33b‧‧‧ frame
331b‧‧‧ matching surface
332b‧‧‧ lower surface
33c‧‧‧ bracket
33d‧‧‧Piezoelectric components
33e‧‧‧ gap
33f‧‧‧ convex
34‧‧‧Insulation sheet
35‧‧‧Conductor
36‧‧‧Case space
G‧‧‧ Chamber spacing

Figure 1 is a schematic cross-sectional view of a detection chamber of a conventional gas detecting device. Figure 2 is a schematic view showing the appearance of the portable gas detecting device of the present invention. FIG. 3 is a schematic cross-sectional view of the detection chamber of the portable gas detecting device of the present invention. FIG. 4A is a schematic exploded view of the actuator of the portable gas detecting device of the present invention. FIG. 4B is another perspective exploded view of the actuator of the portable gas detecting device of the present invention. FIG. 5A is a schematic cross-sectional view of the actuator of the portable gas detecting device of the present invention. 5B to 5D are schematic views of the actuator actuation of the portable gas detecting device of the present invention. Fig. 6 is a schematic view showing the driving mode of the actuator of the portable gas detecting device of the present invention using an instantaneous sampling pulse.

Claims (12)

A portable gas detecting device comprises: at least one detecting chamber having at least one air inlet and at least one air outlet; at least one gas sensor disposed in the detecting chamber to detect the chamber Detecting gas; and at least an actuator disposed in the detection chamber, the at least one actuator comprising a piezoelectric actuator, the piezoelectric actuator being subjected to an excitation signal to generate a resonance effect, such that The gas is introduced outside the detection chamber for sampling, and the actuator is driven by an instantaneous sampling pulse to control the flow of trace gas into the detection chamber to form a stable airflow environment, so that the at least one gas sensor passes through in a stable airflow environment. The gas molecules on the surface are dissolved or bonded to react on the reaction material to form an immediate response to ensure detection sensitivity. The portable gas detecting device according to claim 1, wherein a ratio of a start time (T _{on )} to a stop time (T _{off ) of} the instantaneous sampling pulse is 0.001 to 0.5. The portable gas detecting device according to claim 1, wherein a ratio of a start time (T _{on )} to a stop time (T _{off ) of} the instantaneous sampling pulse is 0.01 to 0.2. The portable gas detecting device of claim 1, wherein the inside of the detecting chamber is partitioned by a partition to form a first compartment and a second compartment, and the air inlet is connected to the air inlet. a first compartment, the air outlet is connected to the second compartment, and the partition has a communication port to communicate the first compartment and the second compartment, and the at least one gas sensor is disposed in the first compartment Indoors. The portable gas detecting device of claim 4, wherein the actuator is fixed between the second compartment and the partition, and is spaced apart from the at least one gas sensor. The portable gas detecting device of claim 1, wherein the at least one gas sensor comprises at least one of an oxygen sensor, a carbon monoxide sensor, and a carbon dioxide sensor, or a combination thereof . The portable gas detecting device of claim 1, wherein the at least one gas sensor comprises a volatile organic sensor. The portable gas detecting device of claim 1, wherein the actuator is a MEMS gas pump. The portable gas detecting device of claim 1, wherein the actuator is a gas pump, comprising: an air inlet plate having at least one air inlet hole, at least one bus bar hole, and a confluence chamber, wherein the at least one air inlet hole is configured to introduce a gas flow, the at least one bus line hole corresponding to the at least one air inlet hole, and the air flow guiding the at least one air inlet hole is converged to the confluence chamber; Having a hollow hole corresponding to the confluence chamber, and the periphery of the hollow hole is a movable portion; wherein the piezoelectric actuator is disposed corresponding to the resonance piece, and the resonance piece and the piezoelectric actuator Having a chamber space therebetween, such that when the piezoelectric actuator is driven, the air flow is introduced from the at least one air inlet hole of the air inlet plate, and is collected into the convergence chamber through the at least one bus bar hole, and then The hollow hole flowing through the resonance piece generates a resonant transmission airflow by the piezoelectric actuator and the movable portion of the resonance piece. The portable gas detecting device of claim 9, wherein the piezoelectric actuator comprises: a suspension plate having a first surface and a second surface, the first surface having a convex portion An outer frame disposed around the outer side of the suspension plate and having a set of matching surfaces; at least one bracket connected between the suspension plate and the outer frame to provide elastic support for the suspension plate; and a piezoelectric element Attaching to the second surface of the suspension plate for applying a voltage to drive the suspension plate to bend vibration; wherein the at least one bracket is formed between the suspension plate and the outer frame, and the suspension plate is The first surface and the assembled surface of the outer frame are formed in a non-coplanar structure, and the first surface of the suspension plate and the resonant plate are maintained in a chamber space. The portable gas detecting device of claim 9, wherein the gas pump comprises a conductive sheet and an insulating sheet, the air bearing plate, the resonant plate, the piezoelectric actuator, and the conductive The sheet and the insulating sheet are stacked in sequence. A portable gas detecting device comprises: at least one detecting chamber having at least one air inlet and at least one air outlet; at least one gas sensor disposed in the detecting chamber to detect the chamber Detecting a gas; and at least an actuator disposed in the detection chamber, the actuator including at least one piezoelectric actuator, the piezoelectric actuator being applied with at least a constant motion signal to generate a resonance effect, Causing the gas outside the detection chamber to be sampled, and the actuator is driven by at least one instantaneous sampling pulse to control the flow of trace gas into the detection chamber to form at least one stable airflow environment, so that the gas sensor is in a stable airflow environment. The gas molecules passing through the surface are dissolved or bonded to react on the reaction material to form an immediate response to ensure detection sensitivity.