Smoke detector, smoke detection method, terminal and medium

Abstract

The invention provides a smoke detector, a smoke detection method, a terminal and a medium, the scattering intensity ratio related to the diameter of smoke particles to be detected is calculated through a single chip microcomputer, and a small smoke particle light source or a large smoke particle light source arranged in a maze is selected as a maze detection light source for detection based on the calculated scattering intensity ratio. The smoke detection efficiency of the smoke detector is greatly improved, small smoke particles are detected by using an ultraviolet light emitting diode as a light source, large smoke particles are detected by using an infrared light emitting diode as a light source, and the sensitivity of the smoke detector is further improved.

Description

Technical Field

[0001] The present invention relates to the technical field of smoke detection, and particularly to a smoke detector, a smoke detection method, a terminal and a medium. Background Art

[0002] With the development of modern society, the fire risk has gradually increased. Especially now, there are more and more high-rise buildings and more and more people. The importance of fire prevention mainly lies in protecting the lives and property safety of the people. The occurrence of a fire is one of the most common, prominent and harmful disasters in real life, and it is a major issue directly related to people's life safety and property safety.

[0003] Smoke detectors play a crucial role in preventing fires. It mainly monitors whether there is smoke in the room. When the smoke concentration exceeds a certain limit, the smoke detector will automatically issue an alarm. In some important places, such as public places, residences, offices, etc., installing smoke detectors is a regulatory requirement. During a fire, smoke detectors can effectively remind residents to escape in time, avoiding casualties and property losses caused by the fire. Smoke detectors are mainly divided into two types. One is an ionization smoke detector. Since the detection structure of the ionization smoke detector contains radioactive substances, it has now withdrawn from the market. The other is a photo-electric induction type smoke detector. Currently, the main products on the market are photo-electric induction type smoke detectors.

[0004] Currently, the maze of a smoke detector includes one or more light-emitting diodes and a photodiode that matches them. When detecting smoke particles, a light-emitting diode is usually selected as the light source for detecting smoke particles. However, when using a single light source for detection, there is a problem of low detection sensitivity. For example, when an infrared emitting diode is used as the light source, it is not sensitive to detecting small particle size smoke particles, while when a blue light emitting diode is used as the light source, it is not sensitive to detecting large particle size smoke particles.

[0005] In the prior art, the method of improving the sensitivity of a smoke detector mostly adopts adding other sensors, such as a temperature sensor for detecting a large amount of heat emitted during the combustion process, a carbon monoxide sensor for detecting an increase in carbon monoxide generated during the incomplete combustion process, etc. In addition, the sensitivity of the smoke detector can be improved by simultaneously detecting temperature, carbon monoxide concentration, and particle concentration. However, a smoke detector using multiple sensors has disadvantages such as large volume, high price, complex manufacturing, and complex operation, and does not solve the problem of low detection sensitivity of traditional photo-electric sensors. Therefore, there is an urgent need to find a smoke detector that still has high sensitivity within a large range of smoke particle sizes. Summary of the Invention

[0006] In view of the above-mentioned disadvantages of the prior art, the purpose of the present invention is to provide a smoke detector, a smoke detection method, a terminal and a medium, which are used to solve the above-mentioned prior art problems.

[0007] To achieve the above object and other related objects, the present invention provides a smoke detector, including: a maze, which is provided with a dual light source composed of a small smoke particle light source and a large smoke particle light source, and a photodiode; a single-chip microcomputer, connected to the maze, for calculating a scattering intensity ratio related to the diameter of the smoke particles to be detected based on a first sampling signal and a second sampling signal received by the photodiode, and selecting the small smoke particle light source or the large smoke particle light source as the maze detection light source based on the scattering intensity ratio, wherein the first sampling signal is the signal received by the photodiode when using the small smoke particle light source as the maze detection light source to irradiate the smoke particles to be detected with light, and the second sampling signal is the signal received by the photodiode when using the large smoke particle light source as the maze detection light source to irradiate the smoke particles to be detected with light.

[0008] In an embodiment of the present invention, the single-chip microcomputer includes: a signal processing module, which is used to perform signal processing on the signal received by the photodiode to obtain a corresponding hexadecimal number; a control device, connected to the signal processing module, for calculating the scattering intensity ratio of the smoke particles to be detected based on the two hexadecimal numbers obtained after the first sampling signal and the second sampling signal respectively pass through the signal processing module for the signal processing, and selecting the small smoke particle light source or the large smoke particle light source as the maze detection light source based on the scattering intensity ratio.

[0009] In an embodiment of the present invention, the control device includes: a scattering intensity ratio calculation module, which is used to calculate the ratio of the two hexadecimal numbers obtained after the first sampling signal and the second sampling signal respectively pass through the signal processing module for the signal processing to obtain the scattering intensity ratio of the smoke particles to be detected; a maze detection light source selection control module, connected to the scattering intensity ratio calculation module, for comparing the scattering intensity ratio with the scattering intensity of the intermediate diameter particles based on the maze detection light source selection strategy, and controlling the selection of the small smoke particle light source or the large smoke particle light source as the maze detection light source; a smoke detection result calculation module, which is used to calculate the smoke concentration corresponding to the smoke particles to be detected based on the hexadecimal number; wherein the calculation method of the scattering intensity ratio of the intermediate diameter particles includes: performing the signal processing on the signals received when respectively using the small smoke particle light source and the large smoke particle light source to irradiate the smoke particles with a diameter of 0.5μm entering the maze to obtain two hexadecimal numbers; calculating the ratio of the two hexadecimal numbers to obtain the scattering intensity ratio of the intermediate diameter particles.

[0010] In an embodiment of the present invention, the maze detection light source selection strategy includes: determining whether the calculated scattering intensity ratio is greater than the scattering intensity of medium-diameter particles; if it is greater, it indicates that the smoke particles to be detected are small smoke particles, and the small smoke particle light source is selected as the maze detection light source; if it is not greater, it indicates that the smoke particles to be detected are large smoke particles, and the large smoke particle light source is selected as the maze detection light source.

[0011] In an embodiment of the present invention, the signal processing module includes: an operational amplifier for amplifying the signal received by the photodiode; an ADC converter connected to the operational amplifier for performing ADC conversion on the signal amplified by the operational amplifier to obtain a corresponding hexadecimal number.

[0012] In an embodiment of the present invention, the maze uses ultraviolet light-emitting diodes and infrared light-emitting diodes, and the incident angles are both 140 degrees.

[0013] In an embodiment of the present invention, the smoke detector further includes: an alarm device connected to the single-chip microcomputer for performing corresponding alarm operations when the smoke detection result corresponding to the smoke particles to be detected obtained exceeds the safety threshold.

[0014] To achieve the above and other related purposes, the present invention provides a smoke detection method for improving sensitivity, which is applied to a smoke detector and includes a maze with a dual light source composed of an ultraviolet light-emitting diode as a small smoke particle light source and an infrared light-emitting diode as a large smoke particle light source and a photodiode therein. The method includes: calculating a scattering intensity ratio related to the diameter of the smoke particles to be detected based on the first sampling signal and the second sampling signal respectively received by the photodiode when the small smoke particle light source and the large smoke particle light source are respectively used to irradiate the smoke particles to be detected entering the maze; selecting the small smoke particle light source or the large smoke particle light source as the maze detection light source to detect the smoke particles to be detected based on the calculated scattering intensity ratio, so as to obtain the smoke detection result corresponding to the smoke particles to be detected.

[0015] To achieve the above and other related purposes, the present invention provides a smoke detection terminal for improving sensitivity, including: a memory and a processor; the memory is used for storing a computer program; the processor is connected to the memory and is used for running the computer program to execute the above method.

[0016] To achieve the above and other related purposes, the present invention provides a computer-readable storage medium storing a computer program, and the computer program is executed by one or more processors to execute the above method.

[0017] As described above, the present invention is a smoke detector, a smoke detection method, a terminal, and a medium, having the following beneficial effects: By calculating, through a single-chip microcomputer, the scattering intensity ratio related to the diameter of smoke particles to be detected, and based on the calculated scattering intensity ratio, selecting a small-particle smoke light source or a large-particle smoke light source arranged in the maze as the maze detection light source for detection, the smoke detection efficiency of the smoke detector is greatly improved. Moreover, by using an ultraviolet light-emitting diode as the light source to detect small-particle smoke particles (0.01 μm to 0.5 μm) and using an infrared light-emitting diode as the light source to detect large-particle smoke particles (0.5 μm to 1 μm), the sensitivity of the smoke detector is further improved. Description of the Drawings

[0018] Figure 1 It shows a schematic structural diagram of the smoke detector in an embodiment of the present invention.

[0019] Figure 2 It shows a schematic structural diagram of the single-chip microcomputer in an embodiment of the present invention.

[0020] Figure 3 It shows a schematic diagram of the relationship between the dimensionless particle size parameter and the scattered light intensity in an embodiment of the present invention.

[0021] Figure 4 a shows a schematic diagram of the relationship between the incident angle and the wavelength when the dimensionless particle size parameter is 1.0 in an embodiment of the present invention.

[0022] Figure 4 b shows a schematic diagram of the relationship between the incident angle and the wavelength when the dimensionless particle size parameter is 4.0 in an embodiment of the present invention.

[0023] Figure 4 c shows a schematic diagram of the relationship between the incident angle and the wavelength when the dimensionless particle size parameter is 6.0 in an embodiment of the present invention.

[0024] Figure 5 It shows a schematic diagram of the relationship between the scattering intensity ratio and the diameter of smoke particles in an embodiment of the present invention.

[0025] Figure 6 It shows a schematic structural diagram of the smoke detector in an embodiment of the present invention.

[0026] Figure 7 It shows a schematic diagram of the flow of the smoke detection method of the smoke detector in an embodiment of the present invention.

[0027] Figure 8 It shows a schematic diagram of the smoke detection control method in an embodiment of the present invention.

[0028] Figure 9It shows a schematic flowchart of the smoke detector method in an embodiment of the present invention.

[0029] Figure 10 It shows a schematic structural diagram of a smoke detection terminal with improved sensitivity in an embodiment of the present invention. Detailed implementation manners

[0030] The following uses specific specific examples to illustrate the implementation manners of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation manners. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0031] It should be noted that in the following description, reference is made to the accompanying drawings, which describe several embodiments of the present invention. It should be understood that other embodiments can also be used, and mechanical composition, structure, electrical, and operational changes can be made without departing from the spirit and scope of the present invention. The following detailed description should not be considered restrictive, and the scope of the embodiments of the present invention is only defined by the claims of the published patent. The terms used here are only for describing specific embodiments and are not intended to limit the present invention. Spatially related terms, such as "upper", "lower", "left", "right", "below", "beneath", "lower part", "above", "upper part", etc., can be used in the text to facilitate the description of the relationship between one element or feature shown in the figure and another element or feature.

[0032] Throughout the specification, when it is said that a certain part is "connected" to another part, this includes not only the case of "direct connection", but also the case of "indirect connection" with other elements placed in between. In addition, when it is said that a certain part "includes" a certain constituent element, unless there is a particularly contrary record, it does not mean excluding other constituent elements, but means that other constituent elements can also be included.

[0033] The first, second, and third terms mentioned therein are used to illustrate various parts, components, regions, layers, and / or segments, but are not limited thereto. These terms are only used to distinguish a certain part, component, region, layer, or segment from other parts, components, regions, layers, or segments. Therefore, the first part, component, region, layer, or segment described below can refer to the second part, component, region, layer, or segment within the scope not exceeding the present invention.

[0034] Furthermore, as used herein, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly dictates otherwise. It should be further understood that the terms "comprising", "including" indicate the presence of the stated features, operations, elements, components, items, species, and / or groups, but do not preclude the presence, occurrence, or addition of one or more other features, operations, elements, components, items, species, and / or groups. The terms "or" and "and / or" used herein are to be construed as inclusive, meaning either or any combination. Thus, "A, B, or C" or "A, B, and / or C" means "any of the following: A; B; C; A and B; A and C; B and C; A, B, and C". An exception to this definition occurs only when the combination of elements, functions, or operations is inherently mutually exclusive in some way.

[0035] A smoke detector of the present invention calculates the scattering intensity ratio related to the diameter of smoke particles to be detected through a single-chip microcomputer, and based on the calculated scattering intensity ratio, selects a small smoke particle light source or a large smoke particle light source arranged in the maze as the maze detection light source for detection, greatly improving the smoke detection efficiency of the smoke detector. Moreover, by using an ultraviolet light-emitting diode as the light source to detect smaller smoke particles (0.01 μm - 0.5 μm) and an infrared light-emitting diode as the light source to detect larger smoke particles (0.5 μm - 1 μm), the sensitivity of the smoke detector is further improved.

[0036] To better describe the smoke detector, the implementation principle of the smoke detector will now be described.

[0037] The following will be a detailed description of the embodiments of the present invention with reference to the accompanying drawings, so that those skilled in the technical field of the present invention can easily implement it. The present invention can be embodied in many different forms and is not limited to the embodiments described herein.

[0038] As Figure 1 Show a schematic structural diagram of a smoke detector in an embodiment of the present invention.

[0039] The structure includes:

[0040] A maze 1, which is provided therein with a dual light source composed of a small smoke particle light source 11 and a large smoke particle light source 12 and a photodiode; the maze 1 can select a dual light source of the small smoke particle light source 11 and the large smoke particle light source 12 with a set wavelength according to requirements, and the incident angle can be set to a fixed angle; the small smoke particle light source 11 and the large smoke particle light source 12 are used as light sources to irradiate the smoke particles entering the maze, and the corresponding reflected signals are received by the photodiode 13.

[0041] The single-chip microcomputer 2 is connected to the maze 1 and is used to calculate the scattering intensity ratio related to the diameter of the smoke particles to be detected based on the first sampling signal and the second sampling signal received by the photodiode 13, and select the small smoke particle light source 11 or the large smoke particle light source 12 as the maze detection light source based on the scattering intensity ratio. Wherein, the first sampling signal is the signal received by the photodiode 13 when the small smoke particle light source 11 is used as the maze detection light source to irradiate the smoke particles to be detected, and the second sampling signal is the signal received by the photodiode 13 when the large smoke particle light source 12 is used as the maze detection light source to irradiate the smoke particles to be detected.

[0042] Specifically, when detecting the smoke particles to be detected, the single-chip microcomputer 2 first controls the maze 1 to perform smoke sampling, that is, controls the small smoke particle light source 11 and the large smoke particle light source 12 to irradiate the smoke particles to be detected entering the maze 1 with light respectively, and the photodiode 13 receives the first sampling signal and the second sampling signal respectively; the single-chip microcomputer 2 calculates the scattering intensity ratio related to the diameter of the smoke particles to be detected based on the first sampling signal and the second sampling signal received by the photodiode 13. Determine the particle size of the smoke to be detected based on the calculated scattering intensity ratio; when it is small smoke particles, select the small smoke particle light source 11 as the maze detection light source to detect the smoke particles to be detected, and obtain the smoke detection result corresponding to the smoke particles to be detected; when it is large smoke particles, select the large smoke particle light source 12 as the maze detection light source to detect the smoke particles to be detected, and obtain the smoke detection result corresponding to the smoke particles to be detected.

[0043] In one embodiment, as Figure 2 , the single-chip microcomputer includes:

[0044] The signal processing module 21 is used to process the signal received by the photodiode 13 to obtain the corresponding hexadecimal number;

[0045] The control device 22 is connected to the signal processing module 21 and is used to calculate the scattering intensity ratio of the smoke particles to be detected for the two hexadecimal numbers obtained after the signal processing of the first sampling signal and the second sampling signal respectively by the signal processing module 21, and select the small smoke particle light source or the large smoke particle light source as the maze detection light source based on the scattering intensity ratio.

[0046] In one embodiment, as Figure 2 , the control device 22 includes:

[0047] The scattering intensity ratio calculation module 221 is configured to calculate the ratio of two hexadecimal numbers obtained by respectively subjecting the first sampling signal received by the photodiode 13 and the second sampling signal to signal processing by the signal processing module 21, so as to obtain the scattering intensity ratio of the smoke particles to be detected. Specifically, the two hexadecimal numbers ADC u and ADC r ; Since C u =K*I U 、ADC r =K*I R , where K is a real number; therefore, the scattering intensity ratio R of the smoke particles to be detected is R = ADC u / ADC r＝ I U / I R .

[0048] The maze detection light source selection control module 222 is connected to the scattering intensity ratio calculation module 221 and is configured to compare the scattering intensity ratio with the scattering intensity of intermediate diameter particles based on the maze detection light source selection strategy, and control the selection of the small smoke particle light source 11 or the large smoke particle light source 12 as the maze detection light source. Wherein, the calculation method of the scattering intensity ratio of the intermediate diameter particles includes: performing the signal processing on the signals received when respectively irradiating the smoke particles with a particle diameter of 0.5 μm entering the maze with the small smoke particle light source 11 and the large smoke particle light source 12 to obtain two hexadecimal numbers; and calculating the ratio of the two hexadecimal numbers by the scattering intensity ratio calculation module 221 to obtain the scattering intensity ratio of the intermediate diameter particles.

[0049] The smoke detection result calculation module 223 is configured to calculate the smoke concentration corresponding to the smoke particles to be detected based on the hexadecimal numbers.

[0050] In a specific embodiment, since when detecting in the same maze, the scattering intensity ratio R shows a monotonically decreasing trend as the particle diameter increases, the smoke particles are divided into two parts according to the diameter size, namely 0.01 μm - 0.5 μm and 0.5 μm - 1 μm. By comparing the scattering intensity ratio R with the scattering intensity of the intermediate diameter particles corresponding to the particle diameter of 0.5 μm, it is determined whether the diameter of the smoke particles is greater than 0.5 μm or less than 0.5 μm.

[0051] Based on the above content, the corresponding maze detection light source selection strategy includes:

[0052] Judging whether the calculated scattering intensity ratio is greater than the scattering intensity of the intermediate diameter particles;

[0053] If it is greater than, it indicates that the smoke particles to be detected are small smoke particles (0.01μm - 0.5μm). Select the small smoke particle light source as the maze detection light source to detect the smoke particles to be detected;

[0054] If it is not greater than, it indicates that the smoke particles to be detected are large smoke particles (0.5μm - 1μm). Select the large smoke particle light source as the maze detection light source to detect the smoke particles to be detected.

[0055] In one embodiment, as Figure 2 , the signal processing module 21 includes:

[0056] An operational amplifier 211 for amplifying the signal received by the photodiode;

[0057] An ADC converter 212 is connected to the operational amplifier 211 for performing ADC conversion on the signal amplified by the operational amplifier 211 to obtain a corresponding hexadecimal number.

[0058] In one embodiment, the maze uses ultraviolet light-emitting diodes and infrared light-emitting diodes, and the incident angles are both 140 degrees, and the incident angles are both 140 degrees.

[0059] First, use Mie light scattering theory to analyze the scattering of particles in fire smoke. The influence of the general particle scale is based on the relationship between the particle diameter and the wavelength of the incident light. Furthermore, it is proved that using ultraviolet diodes as the light source when inspecting 0.01μm - 0.5μm smoke particles and using infrared diodes as the light source when inspecting 0.5μm - 1μm smoke particles can significantly improve the sensitivity of the smoke detector.

[0060] According to Mie scattering theory, when natural light with an intensity of I0 is incident on spherical particles with different scattering intensity formulas in an isotropic medium, the scattered light intensity is I(θ, α, m):

[0061]

[0062] Among them, in the formula, α = πd / λ is the dimensionless particle size parameter of the particle, where λ is the wavelength of the incident light in vacuum, d is the diameter of the smoke spherical particle, θ is the scattering angle. m = m1 + jm2 is the refractive index of the particle relative to the surrounding medium, and r is the distance from the scattering center to the photodiode. And i1 and i2 are respectively the scattering intensity function components perpendicular and parallel to the scattering plane.

[0063] According to the ratio of the particle diameter to the wavelength of the incident light, it can be divided into three regions, namely the Rayleigh scattering region (d < 0.1λ), the Mie scattering region (0.1λ < d < 4λ), and the Fraunhofer diffraction region (d > 4λ).

[0064] Among them, the Fraunhofer diffraction intensity is expressed as:

[0065]

[0066] The Rayleigh scattering intensity is expressed as:

[0067]

[0068] The scattering light intensity of a certain particle and the scattering light intensity at another scattering angle may be completely different. The light intensity distributions of medium-sized particles and small-sized particles are different, showing asymmetry. As α increases, the forward scattering is significantly enhanced, as Figure 3 shown.

[0069] When the particle size is larger than the wavelength, the dependence of the scattering process on the wavelength is not significant, as Figure 4 shown in a, 4b, and 4c.

[0070] Figure 4 As shown in b, the relationship between the dimensionless particle size parameter and the incident angle θ. When α = 4, if a UV diode is used as the light source, d = 464 nm; when a blue light diode is used as the light source, d = 572 nm; when an infrared diode is used as the light source, d = 1196 nm. Therefore, this detector uses a UV diode as the light source when detecting smoke particles with a diameter of 0.01 μm - 0.5 μm, and uses an infrared diode as the light source when detecting smoke particles with a diameter of 0.5 μm - 1 μm.

[0071] Therefore, using a UV diode and an infrared diode to clearly detect particles in different diameter ranges can significantly improve the sensitivity of the smoke detector.

[0072] Secondly, the relationship between the scattering intensity ratio and the diameter of the smoke particles is described.

[0073] Combining the above particle model, the scattering intensity I of the aerosol detected by the receiving hole at a certain scattering angle is obtained n .

[0074]

[0075] C n is the particle concentration, f(d) is the particle diameter distribution function, and I(θ, α, m) is the Mie scattering intensity of a single particle

[0076] The adopted maze selects a dual light source composed of a UV light-emitting diode with a wavelength of λ U and an infrared diode with a wavelength of λ R . The incident angles of both the UV light-emitting diode and the infrared diode are θ = 140°. The refractive index of the smoke is m = 1.59. The corresponding scattering intensities are represented by I U , IR It is expressed that, where α U = πd / λ U 、α R = πd / λ R 。

[0077] The scattering intensity ratio R of the short-wavelength scattering intensity to the long-wavelength scattering intensity is:

[0078]

[0079] Using polystyrene spherical particles with different diameters such as etc. as scattering substances, the corresponding ratio R is obtained through experiments, tests and calculations, and the curve formed by it is as Figure 5 shown.

[0080] It can be seen from this that in the same maze environment, the scattering intensity ratio R of the short-wavelength scattering intensity to the long-wavelength scattering intensity shows a monotonically decreasing trend with the increase of the particle diameter.

[0081] In one embodiment, as Figure 6 , the smoke detector further includes:

[0082] An alarm device 3, connected to the single-chip microcomputer 2, for performing corresponding alarm operations when the smoke detection result corresponding to the smoke particles to be detected obtained exceeds the safety threshold. The alarm device can be any component with an alarm function, such as a buzzer and an alarm lamp.

[0083] In order to better describe the smoke detector, specific embodiments will be described below.

[0084] Embodiment 1: A smoke detector.

[0085] The maze adopted by the smoke detector uses a dual light source composed of a 365nm ultraviolet light-emitting diode and a 940nm infrared light-emitting diode and a photodiode; the incident angles of the dual light source composed of the ultraviolet light-emitting diode and the infrared light-emitting diode are both 140°.

[0086] Before detecting the smoke particles to be measured, first calculate the scattering intensity R0 of the intermediate diameter particles; the specific method is: respectively use the ultraviolet light-emitting diode and the infrared light-emitting diode to irradiate the polystyrene spherical particles with a particle diameter of 0.5μm entering the maze, and the corresponding signals are received by the photodiode. After the two signals are amplified by the internal operational amplifier of the single-chip microcomputer and then converted by the internal ADC of the single-chip microcomputer to obtain two hexadecimal numbers, the single-chip microcomputer calculates the ratio to obtain the scattering intensity R0 of the intermediate diameter particles = 2.

[0087] After obtaining the scattering intensity of the intermediate diameter particles, the smoke detector can perform smoke detection; Figure 7Flowchart of the smoke detection method for a smoke detector.

[0088] The method includes:

[0089] Perform smoke sampling: First, the ultraviolet light-emitting diode emits once to the smoke particles, and the photodiode receives the signal i u , and the infrared light-emitting diode emits once to the smoke particles, and the photodiode receives the signal ir;

[0090] Next, use the single-chip microcomputer to perform smoke detection control, as Figure 8 shown, the ways of smoke detection control include:

[0091] The received signal i u After being amplified by the operational amplifier inside the single-chip microcomputer, and then after being converted by the ADC inside the single-chip microcomputer, the hexadecimal number ADC is obtained u . i r After being amplified by the operational amplifier and converted by the ADC, the hexadecimal number ADC is obtained r . Then calculate the scattering intensity ratio R of the smoke particles = ADC u / ADC r＝ I U / I R .

[0092] Judge whether the scattering intensity ratio R is greater than 2; if R is greater than 2, it indicates that this particle is a smoke particle with a smaller radius, and the single-chip microcomputer controls the ultraviolet light-emitting diode as the maze detection light source to detect the subsequent smoke concentration, and the infrared light-emitting diode is not used temporarily. If R is less than 2, it indicates that this particle is a smoke particle with a larger radius, and the single-chip microcomputer uses the infrared light-emitting diode as the maze detection light source to detect the subsequent smoke concentration, and the ultraviolet light-emitting diode is not used temporarily. If the smoke concentration detected by the adopted light source is greater than the safety threshold, control the buzzer or the red light to give an alarm.

[0093] Similar to the principle of the above embodiment, the present invention provides a smoke detector system.

[0094] The following provides specific embodiments in conjunction with the drawings:

[0095] As Figure 9 shows the schematic flowchart of a smoke detection method for improving sensitivity in an embodiment of the present invention.

[0096] Applied to a smoke detector, including a maze inside which there is a dual light source composed of a small smoke particle light source and a large smoke particle light source and a photodiode, the method includes:

[0097] Step S1: Based on the first sampling signal and the second sampling signal respectively received by the photodiode when irradiating the smoke particles to be detected entering the maze with a small smoke particle light source and a large smoke particle light source, calculate the scattering intensity ratio related to the diameter of the smoke particles to be detected.

[0098] In one embodiment, step S1 includes: performing signal processing on the first sampling signal and the second sampling signal received by the photodiode to obtain corresponding hexadecimal numbers; calculating the scattering intensity ratio of the smoke particles to be detected based on the two hexadecimal numbers obtained after performing the signal processing on the first sampling signal and the second sampling signal respectively through a signal processing module.

[0099] In one embodiment, performing signal processing on the first sampling signal and the second sampling signal received by the photodiode to obtain corresponding hexadecimal numbers includes: amplifying the signal received by the photodiode through an operational amplifier; performing ADC conversion on the signal amplified by the operational amplifier through an ADC converter connected to the operational amplifier to obtain the corresponding hexadecimal numbers.

[0100] In one embodiment, calculating the scattering intensity ratio of the smoke particles to be detected based on the two hexadecimal numbers obtained after performing signal processing on the first sampling signal and the second sampling signal respectively by the photodiode includes: calculating the ratio of the two hexadecimal numbers obtained after performing the signal processing on the first sampling signal and the second sampling signal respectively through a signal processing module to obtain the scattering intensity ratio of the smoke particles to be detected.

[0101] Step S2: Based on the calculated scattering intensity ratio, select a small smoke particle light source or a large smoke particle light source as the maze detection light source to detect the smoke particles to be detected, so as to obtain the smoke detection result corresponding to the smoke particles to be detected.

[0102] In one embodiment, step S2 includes: based on the maze detection light source selection strategy, comparing the scattering intensity ratio with the scattering intensity of intermediate diameter particles, and controlling the selection of a small smoke particle light source or a large smoke particle light source as the maze detection light source; calculating the smoke concentration corresponding to the smoke particles to be detected based on the hexadecimal numbers; wherein, the calculation method of the scattering intensity ratio of the intermediate diameter particles includes: performing the signal processing on the signals received when irradiating the smoke particles with a diameter of 0.5 μm entering the maze with a small smoke particle light source and a large smoke particle light source respectively to obtain two hexadecimal numbers; calculating the ratio of the two hexadecimal numbers to obtain the scattering intensity ratio of the intermediate diameter particles.

[0103] In one embodiment, the maze detection light source selection strategy includes: determining whether the calculated scattering intensity ratio is greater than the scattering intensity of medium-diameter particles; if it is greater, it indicates that the smoke particles to be detected are small smoke particles, and the small smoke particle light source is selected as the maze detection light source; if it is not greater, it indicates that the smoke particles to be detected are large smoke particles, and the large smoke particle light source is selected as the maze detection light source.

[0104] In one embodiment, the maze uses an ultraviolet light-emitting diode and an infrared light-emitting diode, and the incident angles are both 140 degrees.

[0105] Such as Figure 10 Show the structural schematic diagram of the smoke detection terminal with improved sensitivity in the embodiment of the present invention.

[0106] The smoke detection terminal with improved sensitivity includes: a memory 101 and a processor 102. The memory 101 is used to store computer programs; the processor 102 runs the computer programs to implement as Figure 9 The smoke detection method with improved sensitivity as described above.

[0107] Optionally, the number of the memories 101 can be one or more, and the number of the processors 102 can be one or more, and Figure 10 One is taken as an example in both cases.

[0108] Optionally, the processor 102 in the smoke detection terminal 100 with improved sensitivity will, according to the steps as Figure 9 described above, load the instructions corresponding to the processes of one or more application programs into the memory 101, and the processor 102 runs the application programs stored in the first memory 101, so as to implement as Figure 9 The various functions in the smoke detection method with improved sensitivity as described above.

[0109] Optionally, the memory 101 may include, but is not limited to, high-speed random access memory and non-volatile memory. For example, one or more disk storage devices, flash memory devices, or other non-volatile solid-state storage devices; the processor 102 may include, but is not limited to, a central processing unit (CPU), a network processor (NP), etc.; it may also be a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components.

[0110] Optionally, the processor 102 may be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it may also be a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components.

[0111] The present invention also provides a computer-readable storage medium storing a computer program, and when the computer program runs, it implements the method for improving the sensitivity of a smoke detector as shown in Figure 9 The computer-readable storage medium may include, but is not limited to, a floppy disk, an optical disk, a CD-ROM (compact disc read-only memory), a magneto-optical disk, a ROM (read-only memory), a RAM (random access memory), an EPROM (erasable programmable read-only memory), an EEPROM (electrically erasable programmable read-only memory), a magnetic card or an optical card, a flash memory, or other types of media / machine-readable media suitable for storing machine-executable instructions. The computer-readable storage medium may be a product not connected to a computer device or a component already connected to a computer device for use.

[0112] The present invention has the following advantages:

[0113] In view of the problem that a single light source cannot improve the sensitivity to particles with a diameter of 0.01 μm to 1.0 μm, the present invention uses an ultraviolet light-emitting diode as a light source to detect smaller particulate smoke particles (0.01 μm to 0.5 μm), and uses an infrared light-emitting diode as a light source to detect larger particulate smoke particles (0.5 μm to 1 μm) to improve the sensitivity of the smoke detector. The present invention not only has the advantages of simple circuit and increased sensitivity, but also has the advantages of low cost, simple production, and simple operation.

[0114] In summary, for the smoke detector, smoke detection method, terminal, and medium of the present invention, the single-chip microcomputer calculates the scattering intensity ratio related to the diameter of the smoke particles to be detected, and based on the calculated scattering intensity ratio, selects the small particulate smoke light source or the large particulate smoke light source set in the maze as the maze detection light source for detection, greatly improving the smoke detection efficiency of the smoke detector. Moreover, by using an ultraviolet light-emitting diode as a light source to detect smaller particulate smoke particles (0.01 μm to 0.5 μm) and using an infrared light-emitting diode as a light source to detect larger particulate smoke particles (0.5 μm to 1 μm), the sensitivity of the smoke detector is further improved. Therefore, the present invention effectively overcomes various disadvantages in the prior art and has high industrial utilization value.

[0115] The above embodiments are only used to exemplarily illustrate the principle and efficacy of the present invention, rather than to limit the present invention. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A smoke detector, characterized in that, Comprising: A maze, which is provided with a dual light source composed of a light source of small smoke particles and a light source of large smoke particles, and a photodiode; A single-chip microcomputer, connected to the maze, for calculating a scattering intensity ratio related to the diameter of the smoke particles to be detected based on a first sampling signal and a second sampling signal received by the photodiode, and selecting the light source of small smoke particles or the light source of large smoke particles as the maze detection light source based on the scattering intensity ratio, wherein the first sampling signal is the signal received by the photodiode when the light source of small smoke particles is used as the maze detection light source to irradiate the smoke particles to be detected, and the second sampling signal is the signal received by the photodiode when the light source of large smoke particles is used as the maze detection light source to irradiate the smoke particles to be detected.

2. The smoke detector according to claim 1, characterized in that, The single-chip microcomputer includes: A signal processing module, for performing signal processing on the signal received by the photodiode to obtain a corresponding hexadecimal number; A control device, connected to the signal processing module, for calculating the scattering intensity ratio of the smoke particles to be detected based on two hexadecimal numbers obtained by respectively performing the signal processing on the first sampling signal and the second sampling signal by the signal processing module, and selecting the light source of small smoke particles or the light source of large smoke particles as the maze detection light source based on the scattering intensity ratio.

3. The smoke detector according to claim 2, characterized in that, The control device includes: A scattering intensity ratio calculation module, for calculating the ratio of two hexadecimal numbers obtained by respectively performing the signal processing on the first sampling signal and the second sampling signal by the signal processing module to obtain the scattering intensity ratio of the smoke particles to be detected; A maze detection light source selection control module, connected to the scattering intensity ratio calculation module, for comparing the scattering intensity ratio with the scattering intensity of intermediate diameter particles based on a maze detection light source selection strategy, and controlling the selection of the light source of small smoke particles or the light source of large smoke particles as the maze detection light source; A smoke detection result calculation module, for calculating the smoke concentration corresponding to the smoke particles to be detected based on the hexadecimal number; Wherein, the calculation method of the scattering intensity ratio of the intermediate diameter particles includes: performing the signal processing on the signals received when respectively using the light source of small smoke particles and the light source of large smoke particles to irradiate the smoke particles with a diameter of 0.5μm entering the maze to obtain two hexadecimal numbers; calculating the ratio of the two hexadecimal numbers to obtain the scattering intensity ratio of the intermediate diameter particles.

4. The smoke detector according to claim 3, wherein The maze detection light source selection strategy includes: Judging whether the calculated scattering intensity ratio is greater than the scattering intensity of intermediate diameter particles; If it is greater, it indicates that the smoke particles to be detected are small smoke particles, and the light source of small smoke particles is selected as the maze detection light source; If it is not greater, it indicates that the smoke particles to be detected are large smoke particles, and the light source of large smoke particles is selected as the maze detection light source.

5. The smoke detector according to claim 2, characterized in that, The signal processing module includes: An operational amplifier, for amplifying the signal received by the photodiode; An ADC converter, connected to the operational amplifier, is configured to perform ADC conversion on the signal amplified by the operational amplifier to obtain a corresponding hexadecimal number.

6. The smoke detector according to claim 1, characterized in that, The maze uses ultraviolet light-emitting diodes and infrared light-emitting diodes, and the incident angles are both 140 degrees.

7. The smoke detector according to claim 1, characterized in that, The smoke detector further includes: An alarm device, connected to the single-chip microcomputer, is configured to perform corresponding alarm operations when the smoke detection result corresponding to the to-be-detected smoke particles obtained exceeds a safety threshold.

8. A smoke detection method, characterized in that, Applied to a smoke detector, including a maze provided therein with a dual light source composed of a small smoke particle light source and a large smoke particle light source and a photodiode, the method includes: Based on the first sampling signal and the second sampling signal respectively received by the photodiode when the small smoke particle light source and the large smoke particle light source are respectively used to irradiate the to-be-detected smoke particles entering the maze, calculate the scattering intensity ratio related to the diameter of the to-be-detected smoke particles; Based on the calculated scattering intensity ratio, select the small smoke particle light source or the large smoke particle light source as the maze detection light source to detect the to-be-detected smoke particles, so as to obtain the smoke detection result corresponding to the to-be-detected smoke particles.

9. A smoke detection terminal, characterized in that, Includes: A memory and a processor; The memory is configured to store a computer program; The processor, connected to the memory, is configured to run the computer program to execute the method according to claim 8.

10. A computer-readable storage medium, characterized in that, Stores a computer program, and when the computer program is run by one or more processors, it executes the method according to claim 8.

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