KR101976058B1 - Ultra thin micro particulate matter sensor - Google Patents

Abstract

The present invention relates to a fine dust measurement sensor, and more particularly, to a fine dust measurement sensor that is manufactured to be ultra-thin and easy to carry. The fine dust measurement sensor according to an embodiment of the present invention is a flat vibrator fixing frame is fixed to the flat speaker and the air inlet; An air connection guide frame for receiving air therein; An air passage connected to a lower end of the air connection guide frame to discharge air received in the air connection guide frame when the flat speaker is expanded; A light emitting element positioned at the air passage side to irradiate light to the air passage; And a light receiving element disposed perpendicular to a traveling direction of light emitted from the light emitting element to receive light scattered by fine dust included in air moving through the air passage.

Description

ULTRA THIN MICRO PARTICULATE MATTER SENSOR}

The present invention relates to a fine dust measurement sensor, and more particularly, to a fine dust measurement sensor that is manufactured to be ultra-thin and easy to carry.

Fine dust is one of the world's most important environmental problems. According to the World Health Organization report (2014), 7 million people die early from fine dust in a year, and the International Cancer Research Institute officially reported in 2013 that fine dust causes cancer such as lung cancer. .

At present, people's interest in fine dust is increasing, and it is intended to be provided with fine dust information of the place where it is located in real time.

To meet these demands, various fine dust measurement technologies are being developed, and portable fine dust detectors are also being developed.

Recently, the fine dust measurement technology applied to the portable fine dust detector adopts the method as shown in FIG. 2.

Referring to FIG. 2, the portable fine dust detector introduces air into a narrow passage, and includes a fan for circulating air introduced into the narrow passage, a motor for driving the fan, a light emitting device emitting a laser beam, and a fine light after the light emitting device emits light. It includes a light receiving element that is installed at a position perpendicular to the path of the laser beam to receive light scattered by the dust.

When scattered light is received by the light receiving element, the light receiving element outputs an electrical signal corresponding to the scattered light. When the fine dust distributed in the space is flowed by the fan, discrete battery signals are output by the flowing fine dust. At this time, the discrete electrical signal is modulated into a PWM type signal as shown in FIG. At this time, the fine dust measuring unit may calculate the fine dust concentration per unit area by using the pulse number (corresponding to the fine dust number) and the pulse width (corresponding to the fine dust size).

Such a conventional method is inevitably bulky due to the fan used for the air inlet and the motor for driving the fan, which causes a problem of poor portability. In addition, the life of the fan is short, the conventional fine dust measuring device has a problem that the use period is short. There are the following prior arts related to fine dust measuring devices.

1. Korean Registered Patent No. 1017230730000 (Notice date: 2017.04.05) 2. Korean Patent Publication No. 1020170035770 (published: 2017.03.31) 3. Korean Patent Publication No. 1020170035769 (Published: 2017.03.31)

Accordingly, an object of the present invention is to propose an ultra-thin fine dust measurement sensor that is compact and has a long service life.

The fine dust measurement sensor according to an embodiment of the present invention is a flat vibrator fixing frame is fixed to the flat speaker and the air inlet; An air connection guide frame for receiving air therein; An air passage connected to a lower end of the air connection guide frame to discharge air received in the air connection guide frame when the flat speaker is expanded; A light emitting element positioned at the air passage side to irradiate light to the air passage; And a light receiving element disposed perpendicular to a traveling direction of light emitted from the light emitting element to receive light scattered by fine dust included in air moving through the air passage.

Here, the air connection guide frame may be narrowed with a certain inclination from the top to the bottom.

The fine dust measurement sensor of the present invention adopts a flat speaker as a means for introducing and circulating air into the fine dust measurement section. Since the planar speaker can be made extremely thin, the fine dust measurement sensor can be made extremely thin by adopting the planar speaker as the air introduction means. Through this, the fine dust measurement sensor can be manufactured in a very small size and can be a long life compared to the existing.

1 is a view for explaining the structure of a fine dust measurement sensor according to an embodiment of the present invention.
2 is a view for explaining a conventional fine dust measurement method.
3 is a view for explaining the structure of a conventional fine dust meter.

As the invention allows for various changes and numerous embodiments, particular embodiments will be illustrated in the drawings and described in detail in the written description. However, this is not intended to limit the present invention to specific embodiments, it should be understood to include all changes, equivalents, and substitutes included in the spirit and scope of the present invention.

In describing the drawings, similar reference numerals are used for similar elements. In the following description of the present invention, if it is determined that the detailed description of the related known technology may obscure the gist of the present invention, the detailed description thereof will be omitted.

Terms such as first and second may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

For example, without departing from the scope of the present invention, the first component may be referred to as the second component, and similarly, the second component may also be referred to as the first component.

The term and / or includes a combination of a plurality of related items or any item of a plurality of related items.

When a component is referred to as being "connected" or "connected" to another component, it may be directly connected to or connected to that other component, but it may be understood that other components may be present in between. Should be.

On the other hand, when a component is said to be "directly connected" or "directly connected" to another component, it should be understood that there is no other component in between.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the present invention.

Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "comprise" or "have" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or a combination thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art.

Terms such as those defined in the commonly used dictionaries should be construed as having meanings consistent with the meanings in the context of the related art, and are not construed in ideal or excessively formal meanings unless expressly defined in this application. Do not.

Hereinafter, a fine dust measuring sensor according to an exemplary embodiment of the present invention will be described with reference to the accompanying drawings. Hereinafter, descriptions of conventionally well-known matters will be omitted or simplified in order to clarify the gist of the present invention.

1 is a view for explaining the structure of a fine dust measurement sensor according to an embodiment of the present invention.

Referring to FIG. 1, the fine dust measurement sensor includes a sound wave generator 100, a planar vibrator fixing frame 5, flat panel speakers 2, 3, and 4, an air passage 10, a light emitting element 11, and a light receiving element. 8) may be included.

The sound wave generator 100 may provide an electrical signal to the flat panel speakers 2, 3, and 4 to generate sound waves having a preset frequency.

The flat speaker 2, 3, 4 may include a planar vibrator anode 2, a vibrator isolation layer 3, and a planar vibrator diaphragm 4. The flat speaker may be fixed to the inside of the cup-type flat vibrator fixing frame 5 of which the bottom is open. The top of the flat speaker (2, 3, 4) and the planar vibrator fixing frame 5 may be spaced apart by a certain distance. The planar vibrator anode 2, the vibrator isolation layer 3, and the vibrator vibrating plate 4 may be sequentially stacked from top to bottom with reference to FIG. 1. The plane vibrator anode 2 and the plane vibrator diaphragm 4 may receive an electrical signal provided by the sound wave generator 100. In addition, through the reverse piezoelectric effect generated by the omnidirectional signal, the planar vibrator diaphragm 4 may perform expansion and contraction motion in other words. In this case, the planar vibrator diaphragm 4 may vibrate in the up and down direction with reference to FIG. 1. Hereinafter, vibrating in the downward direction based on FIG. 1 may mean “expansion of the flat vibrator diaphragm 4” and vibrating in the upward direction may mean the same as “shrinkage of the flat vibrator diaphragm 4”. The vibration frequency of the vibrator diaphragm 4 may vary according to the frequency of the electrical signal. When the plane vibrator vibrating wave 4 is expanded, air is discharged to the air passage 10, and when contracted, the air may be introduced into the internal space. The present invention is not limited to the structure and type of the flat panel speaker, and may correspond to the flat panel speaker of the present invention as long as it generates sound waves through contraction and expansion of the diaphragm.

At least one air intake port 1 penetrating from the top to the bottom may be formed on the planar vibrator fixing frame 4. An air connection guide frame 6 may be installed below the planar vibrator fixing frame 5. The air connection guide frame 6 has an upper and a lower part open, and an upper part receives air introduced through the air inlet 1 during contraction of the flat vibrator diaphragm 4, and a lower part thereof when the flat vibrator diaphragm 4 is expanded. The air contained in the internal space may be discharged to the air outlet 9 through the air passage 10. When the air contained in the inner space is discharged through the air passage 10 to the air outlet 9, the air connection guide frame 6 is moved from the top to the bottom so that the moving air can be easily guided to the air passage 10. It may have a structure in which the width is narrowed with a certain slope.

The air passage 10 is hollow with both sides open, and the upper portion may be connected to the lower end of the air connection guide frame 6 and the lower portion may be connected to the air outlet 9.

The light emitting element 11 may be installed at the side of the air passage 10. The light emitting element 11 may irradiate the light 7 in the width direction of the air passage 10 (the direction from left to right with reference to FIG. 1). The laser diode LD may be used as the light emitting element 11.

The light receiving element 8 may be installed above the air passage 10. The light receiving element 8 may be installed at a position perpendicular to the moving direction of the light 7 irradiated by the light emitting element 11. Through the arrangement of the light emitting element 11 and the light receiving element 8, the light receiving element 8 may receive only light scattered by fine dust moving through the air passage 10 among the light emitted by the light emitting element 11. Can be. As the light receiving element 8, a photodiode PD may be used.

As described above, the fine dust concentration per unit area may be calculated by analyzing the electrical signal output in response to the light received by the light receiving element 8. For example, when scattered light is received by the light receiving element 8, the light receiving element 8 outputs an electrical signal corresponding to the scattered light. When the fine dust distributed in the space flows by the planar vibrator diaphragm 4, a discrete battery signal is output by the flowing fine dust. At this time, the discrete electrical signal is modulated into a PWM type signal as shown in FIG. At this time, the fine dust measuring unit may calculate the fine dust concentration per unit area by using the pulse number (corresponding to the fine dust number) and the pulse width (corresponding to the fine dust size).

The flat type fine dust sensor of the present invention is made of a USB type, can be made detachable to the smart phone USB port. To this end, the flat type fine dust sensor of the present invention may have a USB interface. In addition, the sensor may be controlled through the USB interface, and an application therefor may be installed in the smartphone. In addition, the output signal of the light receiving element 8 seen above may be processed in the sensor, and the analysis of the processed signal may be performed in the smartphone.

Such flat dust measurement sensor can operate as follows.

The flat speakers 2, 3, and 4 may vibrate (expand and contract) at regular intervals by the sound waves generated by the sound wave generator 100. When the flat panel speakers 2, 3, and 4 are contracted, the air pressure around the flat panel speakers 2, 3, and 4 is increased due to the expansion of the internal space for receiving air by the flat panel speakers 2, 3, and 4. Can descend. In this case, the outside air having a relatively high air pressure may be introduced into the sensor through the air inlet 1. When the flat speakers 2, 3, 4 are expanded, the inner space for receiving air is narrowed by the flat speakers 2, 3, 4, so that the air pressure around the flat speakers 2, 3, 4 is reduced. Can rise. In this case, the air surrounding the flat speaker 2, 3, 4 may be discharged through the air passage 10 to the air outlet 9 having a relatively low air pressure. In this case, the light emitting device 11 may emit light and scatter light due to fine dust present on the air discharged to the air outlet 9 through the air passage 10. In this case, the light receiving element 8 may receive the scattered light and output an electrical signal corresponding to the scattered light during an operation time. In addition, fine dust concentration may be calculated by processing and analyzing an output signal of the light receiving element 8.

In the above structure, in order to maximize the efficiency of air discharge, it is preferable that the volume of air reduced by the expansion of the planar vibrator diaphragm 4 completely escapes to the air outlet 9. To this end, it is preferable that the time at which air is discharged and the time corresponding to one wavelength of the diaphragm 4 frequency coincide with each other. At this time, the diameter of the air passage (10) can be narrowed when the required air speed is fast and wide when the required air speed is slow, the time that the air corresponding to the volume of the compressed air exits the air passage (10) The diameter of the air passage 10 can be determined according to the desired air velocity so as to coincide with the time corresponding to one cycle of the diaphragm 4.

It is preferable to determine the length and structure of the air connection guide frame 6 so that the amount of air discharged to the air outlet 9 is large when the air is discharged, and the amount of air falling into the air inlet 1 is minimized. However, when the length of the air connection guide frame 6 is longer, the time for air to escape is increased and the volume of the sensor is increased. Therefore, it is preferable to determine the length of the air connection guide frame 6 in consideration of such circumstances. .

The area of the air intake port 1 is preferably determined such that the amount of air corresponding to the contracted area of the planar vibrator diaphragm 4 can be supplied during the contraction time of the diaphragm 4 at natural air pressure. At this time, the speed of the air sucked through the air inlet 1 is increased in inverse proportion to the area of the air inlet 1 relative to the area of the plane vibrator diaphragm 4. That is, when the area of the air intake port 1 is 50% of the plane vibrator diaphragm 4, the air is sucked at twice the moving speed of the plane vibrator diaphragm 4, ignoring the portion sucked back from the air outlet 9. do. Accordingly, the area of the air inlet 1 is determined in consideration of the size of the plane vibrator diaphragm 4, the size of the air outlet 9, the moving speed of the plane vibrator diaphragm 4, the air delivery efficiency, and the like. The area of 1) is preferably determined so that the efficiency of air delivery is high in a range larger than the area of the air outlet 9 and less than the size of the planar vibrator diaphragm 4.

100: sound wave generator
1: air intake
2: planar oscillator anode
3: oscillator isolation layer
4: flat oscillator diaphragm
5: flat oscillator fixing frame
6: air connection guide frame
7: light
8: light receiving element
9: air outlet
10: air passage
11: light emitting element

Claims (2)

A sound wave generator for providing an electric signal to the flat panel speaker to generate sound waves having a preset frequency;
A flat vibrator fixing frame to which the flat speaker is fixed and at least one air inlet is formed on the flat speaker to allow air into the internal space when the flat speaker is contracted;
An air connection guide frame having upper and lower portions open to receive air introduced through the air inlet, and having a predetermined slope in a lower direction of the flat speaker;
An air passage connected to a lower end of the air connection guide frame to discharge air received in the air connection guide frame when the flat speaker is expanded;
A light emitting element positioned at the air passage side to irradiate light to the air passage; And
A light receiving element disposed perpendicular to a moving direction of light emitted by the light emitting element to receive light scattered by fine dust included in air moving through the air passage;
The flat speaker receives an electrical signal provided by the sound wave generator, the fine dust measurement sensor, characterized in that the intake or discharge of air by expanding or contracting movement by the electrical signal. delete

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