CN112767642A - Double-light-source photoelectric smoke detector detection method, device and system - Google Patents
Double-light-source photoelectric smoke detector detection method, device and system Download PDFInfo
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- CN112767642A CN112767642A CN202011472298.8A CN202011472298A CN112767642A CN 112767642 A CN112767642 A CN 112767642A CN 202011472298 A CN202011472298 A CN 202011472298A CN 112767642 A CN112767642 A CN 112767642A
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- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B17/00—Fire alarms; Alarms responsive to explosion
- G08B17/10—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means
- G08B17/103—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using a light emitting and receiving device
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Abstract
The invention provides a detection method, a device and a system of a double-light-source photoelectric smoke detector. According to the detection method of the double-light-source photoelectric smoke detector, the relation between the size of the output result of the integral amplifying circuit and the concentration of the detected particles is utilized, the multi-stage integral amplifying circuit is added, and the control unit acquires the output results of different amplification levels to judge the type of the particles according to whether the output result of the integral amplifying circuit is in a full range or not, so that the problem that the type of the particles cannot be distinguished when the integral amplifying circuit outputs the full range is solved.
Description
Technical Field
The invention relates to the technical field of double-light-source photoelectric smoke detectors, in particular to a detection method, a detection device and a detection system of a double-light-source photoelectric smoke detector.
Background
The photoelectric smoke detector is a fire alarm device developed by utilizing the basic property that smoke generated in the process of fire can change the transmission characteristic of light. The arrangement of the infrared light-emitting element and the photosensitive element (photon-receiving element) of the point type photoelectric smoke detector in the detection chamber thereof is usually an offset design. The distance between the two is typically 20-25mm in normal smokeless monitoring conditions, the light sensitive element does not receive any light, including light emitted by the infrared light emitting element. When smoke particles enter the detection chamber, the light emitted by the infrared light-emitting element is scattered or reflected by the smoke particles to the photosensitive element, and when a sufficient light signal is received, a fire alarm is given out.
The new version of the UL217 standard, released by the Underwriters Laboratories (UL) in 2020, requires that all smoke detectors must meet these standards for different types of smoke, such as wood fire, paper fire, polyurethane fire, smoldering polyurethane, smoldering wood fire, hamburger interference tests, and the like. In practical application, water mist, dust and baked bread are main factors causing false alarm of the photoelectric smoke detector.
For the above reasons, the photoelectric smoke detector must be able to distinguish the type of the particle and then decide whether to alarm according to the alarm limit value corresponding to the type of the particle. The existing photoelectric smoke detector generally adopts a blue light source and an infrared light source to distinguish the particle types. The method comprises the steps of obtaining test results of blue light and infrared light respectively by utilizing different reflection, refraction and scattering rates of different particles to the blue light and the infrared light, and dividing the result of the blue light by the result of the infrared light to obtain a ratio. The ratio (the value of which is the result of the experiment of burning various kinds of smoke) is then used to determine which kind of particles was detected.
The existing double-light source detector technology can distinguish different particles, and many false alarms are reduced. However, in practical applications, when high-concentration smoke, water vapor and dust are suddenly generated, the output of blue light and infrared light is full range, and the detected particles cannot be distinguished, so that false alarm or false alarm is easy to occur.
Disclosure of Invention
In view of this, the present invention provides a detection method, device and system for a dual-light source photoelectric smoke detector, so as to solve the following problems existing in the prior art: aiming at the problem that the particle types cannot be distinguished because the output of sudden high-concentration smoke, blue light and infrared light is full scale.
In a first aspect, the present invention provides a method for detecting a dual light source photoelectric smoke detector, comprising the steps of,
the light emitting unit emits detection light;
the light receiving unit receives the detection light and transmits an output result to the multi-stage amplification unit for amplification and output;
the control unit detects the output value of the multi-stage amplification unit and carries out full-scale judgment processing;
calculating according to the output value, and judging the type of the particles according to the calculation result;
judging whether the particle type exceeds the alarm limit value of the particle type, and if so, outputting an alarm signal;
preferably, the full-scale determining process specifically includes:
judging whether the output value of the amplifying unit at the current level reaches the maximum measurement value and whether the amplifying unit at the current level is the first-level amplifying unit;
if the output value of the amplifying unit at the current level reaches the maximum measurement value and the amplifying unit at the current level is not the first-level amplifying unit, acquiring and judging whether the output value of the amplifying unit at the previous level reaches the maximum measurement value or not until the acquired value does not reach the maximum measurement value or the current acquired value is the output value of the first-level amplifying unit;
with reference to the first aspect, the emitting of the probe light by the light emitting unit is specifically: the light emitting unit emits blue light and infrared light according to a certain rule;
preferably, the light emitting unit emits blue light and infrared light according to a certain rule, specifically: emitting blue light and infrared light alternately for a certain time period in a certain interval time cycle;
preferably, the specific interval time is 1s, and the specific time duration is 100 ms;
specifically, the output values of the multi-stage amplification unit include a blue light output AD value and an infrared light output AD value;
specifically, the calculating according to the output value specifically includes:
calculating the average value of the acquired multiple blue light output AD values;
calculating the average value of a plurality of acquired infrared light output AD values;
calculating the ratio of the average value of the blue light to the average value of the infrared light;
in a second aspect, the present invention further provides a dual light source photoelectric smoke detector device, including:
a light emitting unit for emitting a detection light for detecting smoke;
a light receiving unit for receiving the detection light scattered by the smoke;
a multistage amplification unit for amplifying the photoelectric signal output from the light receiving unit;
the control unit is used for controlling the light emitting unit to emit the probe light, detecting the output signal of the multistage amplifying unit, judging the type of the particles and outputting an alarm signal;
specifically, the multistage amplification unit is a multistage integral amplification unit connected in series, the stage number of the integral amplification unit is greater than 1, the control unit is connected with the output end of each stage of amplification unit, and the output value of each stage of amplification unit can be collected.
In a third aspect, the present invention further provides a dual light source photoelectric smoke detector system, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the dual light source smoke detector detection method according to any one of the first aspect of the present invention when executing the computer program.
The invention provides a detection method, a device and a system of a double-light-source photoelectric smoke detector, wherein the detection method of the double-light-source photoelectric smoke detector is characterized in that a multistage integral amplifying circuit is added by utilizing the relation between the size of an output result of the integral amplifying circuit and the concentration of detected particles, and input circuits with different amplification levels are adopted according to the output result of the amplifying circuit, so that the problem that the types of the particles cannot be distinguished when the output of blue light and infrared light is full range during sudden high-concentration smoke is solved.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a flow chart of a method for detecting a double-light-source photoelectric smoke detector according to the present invention;
FIG. 2 is a flow chart of an embodiment of a dual light source photoelectric smoke detector detection method provided by the present invention;
FIG. 3 is a schematic diagram of a dual light source photoelectric smoke detector apparatus according to the present invention;
FIG. 4 is a schematic diagram of a dual light source photoelectric smoke detector system according to the present invention;
the meanings represented by the reference numerals in the above drawings are as follows:
1: double-light-source photoelectric smoke detector device
11: light emitting unit
12: light receiving unit
13: multi-stage amplification unit
131: first-stage integral amplifying unit
132: second stage integral amplifying unit
133: third-stage integral amplifying unit
134: fourth-stage integral amplifying unit
14: control unit
2: double-light-source photoelectric smoke detector system
21: memory device
22: processor with a memory having a plurality of memory cells
23: computer program
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The components of embodiments of the present invention generally described in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
In a first aspect, the present invention provides a detection method for a dual light source photoelectric smoke detector device, referring to fig. 1, specifically including the following steps:
s1, the light emitting unit emits detection light;
s2, the light receiving unit receives the detecting light and transmits the output result to the multi-stage amplifying unit for amplifying output;
s3, the control unit detects the output value of the multi-stage amplification unit and carries out full scale judgment processing;
s4, calculating according to the output value, and judging the type of the particles according to the calculation result;
s5, judging whether the particle type exceeds the alarm limit value of the particle type, and if so, performing alarm operation;
with reference to fig. 1 and 2, the method will be described by way of a specific example.
In step S1:
the light emitting unit 11 emits the blue light and the infrared light for a specific time period at a certain rule, and in this embodiment, the blue light and the infrared light are emitted alternately for 100ms at an interval of 1s, that is, the infrared light is emitted for 100ms first, and then the blue light is emitted for 100ms, and preferably, the wavelengths of the blue light and the infrared light are 470nm and 920nm respectively.
In step S2:
it should be noted that the light emitting unit 11 and the light receiving unit 12 are not arranged in parallel, and in the normal case of no smoke, the light receiving unit 12 cannot detect the infrared light and the blue light emitted from the light emitting unit 11.
In the case of smoke, the light receiving unit 12 receives infrared light and blue light scattered by dust, and then transmits the photoelectric signal to the multistage amplification unit 13 associated therewith for stepwise amplification, so that the control unit 14 can receive and process the signal. The multi-stage amplifying unit includes a plurality of integrating amplifying units, which are set to four stages in this embodiment.
In step S3:
the control unit 14 collects AD output values Vi of n multi-stage amplification units, and performs mean value processing on n sampled data, if the Vi value has reached the maximum measurement range value of the control unit 14 in the data sampled each time, the previous stage, i.e., the third stage integral amplification unit 133, is to sample the data, and the sampled values are:
Vi＝Vk3×β3
where Vk3 is data sampled by the third-stage integrating and amplifying unit 133, and β 3 is amplification data of the third-stage integrating and amplifying unit 133.
If the value of Vk3 has reached the maximum range value of control unit 14, the data is sampled to second stage integrator-amplifier unit 132, and the sampled value is:
Vi＝Vk2×β3×β2
where Vk2 is the data sampled by second stage integrating and amplifying unit 132, and β 2 is the amplification data of second stage integrating and amplifying unit 132.
If the value of Vk2 has reached the maximum range value of control unit 14, the data is sampled to first stage integrator-amplifier unit 131, and the sampled value is:
Vi＝Vk1×β3×β2×β1
where Vk1 is the data sampled by first stage integrating and amplifying unit 131, and β 1 is the amplification data of first stage integrating and amplifying unit 131.
The data for infrared light is:
the data for blue light is:
the ratio of the detection results of blue light and infrared light is:
in step S4, different types of particles can be distinguished according to the ratio based on the scattering light characteristics of blue light and red light of different particle sizes.
In step S5, it is determined whether an alarm threshold is reached depending on the type of particles to determine whether to alarm.
In a second aspect, the present invention further provides a dual light source photoelectric smoke detector apparatus 1, as shown in fig. 3, the dual light source photoelectric smoke detector apparatus provided by the present invention includes a photoelectric emitting unit 11, a photoelectric receiving unit 12, a multi-stage amplifying unit 13, and a control unit 14.
The photoelectric emission unit 11 emits the detection light, and includes a blue light emission circuit and an infrared light emission circuit, and the photoelectric emission unit 11 can emit the blue light and the infrared light according to a certain rule under the control of the control unit 14, in this embodiment, the rule refers to alternately emitting the infrared light and the blue light with a duration of 100ms at an interval of 1s, and it should be noted that this manner is only listed in a better description technical scheme, and does not constitute a limitation to the present invention.
The photoelectric receiving unit 12 is a photosensitive receiving circuit, receives the blue light and the infrared light scattered by the dust emitted from the photoelectric emitting unit 11, and outputs the detection result to the multistage amplifying unit 13.
The multistage amplification unit 13 is formed by connecting a plurality of integral amplification units in series, four stages are temporarily listed in this embodiment, and are respectively a first-stage integral amplification unit 131, a second-stage integral amplification unit 132, a third-stage integral amplification unit 133, and a fourth-stage integral amplification unit 134, and each integral amplification unit amplifies the photoelectric signal transmitted by the photoelectric receiving unit 12 stage by stage and outputs the amplified photoelectric signal to the control unit 14.
The control unit 14 is coupled to the light emitting unit 11, and the control unit 14 controls the light emitting unit 11 to emit the blue light and the infrared light in a manner such that the blue light and the infrared light are alternately emitted for a duration of 100ms at intervals of 1S.
The control unit 14 is connected to each stage of integral amplification unit, and can collect the output value of each stage of integral amplification unit.
Normally, for convenience of processing, the control unit 14 directly collects the AD output value (including blue light and infrared light) of the final stage of the integrating and amplifying circuit, because the AD output value of the final stage is the value of the maximum amplification factor of the photoelectric signal of the photoelectric receiving unit 12, it is easier to process.
If sudden and high-concentration smoke occurs, the AD output value of the last stage reaches the maximum range of the control unit 14, at this time, the type of the particles cannot be judged through the ratio, the control unit 14 collects the AD output value of the previous stage integral amplification unit (such as 133) to carry out full-range judgment until the AD output value does not reach the maximum range of the control unit 14, and judges the type of the particles on the basis of the AD output value of the stage integral amplification circuit, so as to judge whether to alarm or not.
In a third aspect, the present invention also provides a dual light source photoelectric smoke detector system 2 comprising a memory 21, a processor 22 and a computer processing program 23, such as a dual light source photoelectric smoke detector detection program, stored on the memory 21 and executable on the processor 22. The processor 22, when executing the computer program 23, implements the steps of the dual light source photo-smoke detector detection method described above, such as steps S1-S5 shown in fig. 1. Alternatively, the processor 22, when executing the computer program 23, implements the functions of the units in the dual light source photoelectric smoke detector apparatus 1, such as the functions of the modules 11 to 14 shown in fig. 3.
The memory 21 may be an internal storage unit of the dual light source photo-smoke detector system, such as a hard disk or a memory of the dual light source photo-smoke detector system. The memory 51 may also be an external storage device of the dual-light source photoelectric smoke detector system, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), or the like, which is provided on the dual-light source photoelectric smoke detector system. Further, the memory 21 may also include both an internal storage unit and an external storage device of the dual light source photoelectric smoke detector system. The memory 21 is used to store the computer program 23 and other programs and data required by the dual light source photo-smoke detector system. The memory 21 may also be used to temporarily store data that has been output or is to be output.
The Processor 22 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The invention provides a detection method, a device and a system of a double-light-source photoelectric smoke detector, which utilize the relation between the output result size of an integral amplifying circuit and the concentration of detected particles to increase a multi-stage integral amplifying circuit, and adopt input circuits with different amplification levels according to the output result of the amplifying circuit; the problem that the type of particles cannot be judged due to the full range under the condition of sudden high-concentration smoke is solved.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present invention, which are used for illustrating the technical solutions of the present invention and not for limiting the same, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the present invention in its spirit and scope. Are intended to be covered by the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. A detection method of a double-light-source photoelectric smoke detector is characterized in that,
the light emitting unit emits detection light;
the light receiving unit receives the detection light and transmits an output result to the multi-stage amplification unit for amplification and output;
the control unit detects the output value of the multi-stage amplification unit and carries out full-scale judgment processing;
calculating according to the output value, and judging the type of the particles according to the calculation result;
and judging whether the particle type exceeds the alarm limit value of the particle type, and if so, outputting an alarm signal.
2. The detection method of the dual-light-source photoelectric smoke detector according to claim 1, wherein the full scale judgment processing specifically comprises:
judging whether the output value of the amplifying unit at the current level reaches the maximum measurement value and whether the amplifying unit at the current level is the first-level amplifying unit;
if the output value of the amplifying unit at the current level reaches the maximum measurement value and the amplifying unit at the current level is not the first-level amplifying unit, acquiring and judging whether the output value of the amplifying unit at the previous level reaches the maximum measurement value or not until the acquired value does not reach the maximum measurement value or the current acquired value is the output value of the first-level amplifying unit.
3. The detection method of the dual-light-source photoelectric smoke detector according to claim 1, wherein the light emitting unit emits the detection light specifically: the light emitting unit emits blue light and infrared light according to a certain rule.
4. The detection method of the dual-light-source photoelectric smoke detector according to claim 3, wherein the light emitting unit emits blue light and infrared light according to a certain rule, specifically: blue light and infrared light are alternately emitted for a certain time period in a cycle of a certain interval time.
5. The method as claimed in claim 4, wherein the specific time interval is 1s and the specific time duration is 100 ms.
6. The detecting method of claim 3, wherein the output values of the multistage amplifying unit include a blue light output AD value and an infrared light output AD value.
7. The detection method of the dual-light-source photoelectric smoke detector according to claim 6, wherein the calculation is performed according to output values, specifically:
calculating the average value of the acquired multiple blue light output AD values;
calculating the average value of a plurality of acquired infrared light output AD values;
and calculating the ratio of the average value of the blue light to the average value of the infrared light.
8. A dual light source photoelectric smoke detector apparatus, comprising:
a light emitting unit for emitting a detection light for detecting smoke;
a light receiving unit for receiving the detection light scattered by the smoke;
a multistage amplification unit for amplifying the photoelectric signal output from the light receiving unit;
and the control unit is used for controlling the light emitting unit to emit the detection light, detecting the output signal of the multistage amplifying unit, judging the type of the particles and outputting an alarm signal.
9. The device of claim 8, wherein the multiple amplifying units are multiple integrating amplifying units connected in series, the number of the integrating amplifying units is greater than 1, and the control unit is connected to the output of each amplifying unit to collect the output of each amplifying unit.
10. A dual light source photoelectric smoke detector system comprising a memory, a processor, and a computer program stored in said memory and executable on said processor, wherein said processor when executing said computer program performs the steps of a dual light source smoke detector detection method according to any one of claims 1 to 7.
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Application publication date: 20210507 |