CN115482643A - Fire smoke detector and detection method thereof - Google Patents
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- 239000000779 smoke Substances 0.000 title claims abstract description 82
- 238000001514 detection method Methods 0.000 title claims abstract description 69
- 230000008033 biological extinction Effects 0.000 claims abstract description 222
- 230000003287 optical effect Effects 0.000 claims abstract description 37
- 239000002245 particle Substances 0.000 claims abstract description 23
- 238000012545 processing Methods 0.000 claims abstract description 21
- 238000000149 argon plasma sintering Methods 0.000 claims description 26
- 238000000034 method Methods 0.000 claims description 23
- 239000000443 aerosol Substances 0.000 claims description 11
- 239000005662 Paraffin oil Substances 0.000 claims description 7
- 238000004364 calculation method Methods 0.000 claims description 6
- 230000004044 response Effects 0.000 claims description 6
- 239000000428 dust Substances 0.000 abstract description 9
- 239000003595 mist Substances 0.000 abstract description 9
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- 238000009835 boiling Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 235000015220 hamburgers Nutrition 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
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- 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
- G08B17/107—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 for detecting light-scattering due to smoke
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- G01N15/06—Investigating concentration of particle suspensions
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/06—Investigating concentration of particle suspensions
- G01N15/075—Investigating concentration of particle suspensions by optical means
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Abstract
The application relates to the technical field of fire detection, in particular to a fire smoke detector and a detection method thereof, wherein the fire smoke detector comprises: the dual-wavelength light source is used for sending out a dual-wavelength optical signal according to the received driving signal; the detection assembly is used for receiving a first wavelength scattering signal, a second wavelength scattering signal, a first wavelength extinction signal and a second wavelength extinction signal which are generated after the dual-wavelength optical signal passes through the particles to be detected; and the signal processing component is used for calculating a scattering coefficient according to the first wavelength scattering signal and the second wavelength scattering signal, calculating an extinction coefficient according to the first wavelength extinction signal and the second wavelength extinction signal, calculating a scattering extinction ratio according to the scattering coefficient and the extinction coefficient, and generating a smoke detection result according to the scattering coefficient, the extinction coefficient and/or the scattering extinction ratio. Therefore, the problem of false alarm caused by the fact that the related technology is easily influenced by dust or water mist is solved, the false alarm generated by interference particles is overcome, and the alarm accuracy rate is improved.
Description
Technical Field
The application relates to the technical field of fire detection, in particular to a fire smoke detector and a detection method thereof.
Background
In the field of fire detection, photoelectric smoke-sensing fire detectors generally adopt a single-wavelength light source to detect the absorption or scattering of smoke particles to the light source to sense the occurrence of fire, and are easily influenced by dust or water mist to cause false alarm although the sensitivity is high.
The related technology provides a method for detecting smoke and distinguishing non-fire aerosol by using two lights with different wavelengths, distinguishing fire smoke and non-fire aerosol according to the particle size distribution characteristics, and providing a basic criterion for a fire smoke detector to eliminate the interference of the non-fire aerosol; another proposed method uses two different wavelengths of light for smoke detection and measurement calibration to distinguish fire smoke particles from interference sources by the ratio of the light scatter of the two wavelengths.
However, although the first method can solve the false alarm caused by the dust interference, the false alarm of the water mist generated in a high humidity environment or boiling cannot be effectively eliminated, and the false alarm still generates necessary economic loss; the second type can solve the false alarm caused by dust interference and hamburger test, but does not carry out kitchen water mist test, and can not completely solve the problem of high false alarm rate in the household environment.
Disclosure of Invention
The application provides a fire smoke detector and a detection method thereof, which are used for solving the problem of false alarm caused by the fact that the related technology is easily influenced by dust or water mist, overcoming the false alarm generated by interference particles and improving the alarm accuracy.
An embodiment of a first aspect of the present application provides a fire smoke detector, including: the dual-wavelength light source is used for sending out a dual-wavelength optical signal according to the received driving signal; the detection assembly is used for receiving a first wavelength scattering signal, a second wavelength scattering signal, a first wavelength extinction signal and a second wavelength extinction signal which are generated after the dual-wavelength optical signal passes through the particles to be detected; and the signal processing component is used for calculating a scattering coefficient according to the first wavelength scattering signal and the second wavelength scattering signal, calculating an extinction coefficient according to the first wavelength extinction signal and the second wavelength extinction signal, calculating a scattering extinction ratio according to the scattering coefficient and the extinction coefficient, and generating a smoke detection result according to the scattering coefficient, the extinction coefficient and/or the scattering extinction ratio.
Optionally, in some embodiments, the alarm assembly includes: the acoustic alarm unit is used for performing acoustic alarm when the smoke detection result meets the preset alarm condition; and/or the optical alarm unit is used for giving an optical alarm when the smoke detection result meets the preset alarm condition.
Optionally, in some embodiments, the preset alarm condition is that the scattering coefficient is greater than a first preset threshold, and/or the extinction coefficient is greater than the first preset threshold.
Optionally, in some embodiments, the scattering extinction ratio includes an infrared light scattering extinction ratio and a blue light scattering extinction ratio, and the signal processing component is further configured to: and when the scattering coefficient is smaller than or equal to the first preset threshold and the extinction coefficient is smaller than or equal to the first preset threshold, if the infrared light scattering extinction ratio and the blue light scattering extinction ratio are both second preset thresholds, the smoke detection result response is paraffin oil aerosol.
Optionally, in some embodiments, the signal processing component further includes: the first calculation unit is used for calculating the ratio of the first wavelength scattering signal to the second wavelength scattering signal and obtaining the scattering coefficient according to the ratio; the second calculation unit is used for calculating a first difference value of the first wavelength extinction signal and the dual-wavelength optical signal, a second difference value of the second wavelength extinction signal and the dual-wavelength optical signal, and obtaining the extinction coefficient according to a logarithmic ratio of a second difference value of the prime number and the second difference value; a third calculating unit, configured to obtain the scattering extinction ratio according to a ratio of the first wavelength scattering signal to the first wavelength extinction signal when the wavelengths of the first wavelength scattering signal and the first wavelength extinction signal are the same, or obtain the scattering extinction ratio according to a ratio of the second wavelength scattering signal to the second wavelength extinction signal when the wavelengths of the second wavelength scattering signal and the second wavelength extinction signal are the same.
Optionally, in some embodiments, the signal processing component further includes: a generating unit for generating the driving signal.
In a second aspect, an embodiment of the present application provides a detection method for a fire smoke detector, including: sending out a dual-wavelength optical signal according to the received driving signal; receiving a first wavelength scattering signal, a second wavelength scattering signal, a first wavelength extinction signal and a second wavelength extinction signal which are generated after the dual-wavelength optical signal passes through the particles to be detected; calculating a scattering coefficient according to the first wavelength scattering signal and the second wavelength scattering signal, calculating an extinction coefficient according to the first wavelength extinction signal and the second wavelength extinction signal, and calculating a scattering extinction ratio according to the scattering coefficient and the extinction coefficient to generate a smoke detection result in the scattering coefficient, the extinction coefficient and/or the scattering extinction.
Optionally, in some embodiments, the detection method of the fire smoke detector further includes: judging whether the smoke detection result meets a preset alarm condition or not; and sending out an alarm signal when the smoke detection result meets the preset alarm condition.
Optionally, in some embodiments, the above method for detecting a fire smoke detector, wherein the issuing an alarm signal when the smoke detection result satisfies the preset alarm condition includes: when the smoke detection result meets the preset alarm condition, performing acoustic alarm; and/or giving an optical alarm when the smoke detection result meets the preset alarm condition.
Optionally, in some embodiments, the preset alarm condition is that the scattering coefficient is greater than a first preset threshold, and/or the extinction coefficient is greater than the first preset threshold.
Optionally, in some embodiments, the scattering extinction ratio includes an infrared light scattering extinction ratio and a blue light scattering extinction ratio, and further includes: and when the scattering coefficient is smaller than or equal to a first preset threshold value and the extinction coefficient is smaller than or equal to the first preset threshold value, if the infrared light scattering extinction ratio and the blue light scattering extinction ratio are both second preset threshold values, responding to the smoke detection result to paraffin oil aerosol.
Optionally, in some embodiments, the calculating a scattering coefficient according to the first wavelength scattering signal and the second wavelength scattering signal, and calculating an extinction coefficient according to the first wavelength extinction signal and the second wavelength extinction signal, and calculating a scattering extinction ratio according to the scattering coefficient and the extinction coefficient includes: calculating the ratio of the first wavelength scattering signal to the second wavelength scattering signal, and obtaining the scattering coefficient according to the ratio; calculating a first difference value of the first wavelength extinction signal and the dual-wavelength optical signal, a second difference value of the second wavelength extinction signal and the dual-wavelength optical signal, and obtaining the extinction coefficient according to a logarithmic ratio of a second difference value of the prime numbers and the second difference value; and when the wavelengths of the first wavelength scattering signal and the first wavelength extinction signal are the same, obtaining the scattering extinction ratio according to the ratio of the first wavelength scattering signal to the first wavelength extinction signal, or when the wavelengths of the second wavelength scattering signal and the second wavelength extinction signal are the same, obtaining the scattering extinction ratio according to the ratio of the second wavelength scattering signal to the second wavelength extinction signal.
Therefore, a dual-wavelength light source sends out a dual-wavelength light signal according to a received driving signal, at least one detection assembly receives a first wavelength scattering signal, a second wavelength scattering signal, a first wavelength extinction signal and a second wavelength extinction signal which are generated after the dual-wavelength light signal passes through a particle to be detected, a signal processing assembly calculates a scattering coefficient according to the first wavelength scattering signal and the second wavelength scattering signal, calculates an extinction coefficient according to the first wavelength extinction signal and the second wavelength extinction signal, calculates a scattering extinction ratio according to the scattering coefficient and the extinction coefficient, and generates a smoke detection result according to the scattering coefficient, the extinction coefficient and/or the scattering extinction ratio. Therefore, extinction measurement is added on the basis of scattering detection, the scattering coefficient and the extinction coefficient are processed and calculated in real time and are in a scattering extinction ratio, and comparison and judgment are carried out, so that the problem of false alarm caused by the fact that related technologies are easily affected by dust or water mist is solved, the false alarm generated by interference particles is overcome, a more accurate fire smoke detection result is obtained, the false alarm is reduced, and the alarm accuracy is improved.
Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.
Drawings
The foregoing and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a block schematic diagram of a fire smoke detector provided according to an embodiment of the present application;
FIG. 2 is a schematic diagram of a fire smoke detector according to one embodiment of the present application;
FIG. 3 is a schematic diagram illustrating a process for calculating a scattering extinction ratio according to an embodiment of the application;
FIG. 4 is a flow chart of an alarm algorithm provided in accordance with one embodiment of the present application;
fig. 5 is a flowchart of a detection method of a fire smoke detector according to an embodiment of the present application.
Detailed Description
Reference will now be made in detail to the embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present application and should not be construed as limiting the present application.
A fire smoke detector and a detection method thereof according to an embodiment of the present application will be described below with reference to the accompanying drawings. In order to solve the problem that the related technologies mentioned in the background art are easily affected by dust or water mist to cause false alarm, the application provides a fire smoke detector and a detection method thereof, in the method, a dual-wavelength light source sends out a dual-wavelength light signal according to a received driving signal, at least one detection assembly receives a first wavelength scattering signal, a second wavelength scattering signal, a first wavelength extinction signal and a second wavelength extinction signal which are generated after the dual-wavelength light signal passes through a detected particle, a signal processing assembly calculates a scattering coefficient according to the first wavelength scattering signal and the second wavelength scattering signal, calculates an extinction coefficient according to the first wavelength extinction signal and the second wavelength extinction signal, calculates a scattering extinction ratio according to the scattering coefficient and the extinction coefficient, and generates a smoke detection result according to the scattering coefficient, the extinction coefficient and/or the scattering extinction ratio. Therefore, the problem of false alarm caused by the fact that the related technology is easily influenced by dust or water mist is solved, the false alarm generated by interference particles is overcome, and the alarm accuracy rate is improved.
Specifically, fig. 1 is a block diagram of a fire smoke detector according to an embodiment of the present disclosure.
As shown in fig. 1, the fire smoke detector includes: dual wavelength light source 100, probe assembly 200, and signal processing assembly 300.
The dual-wavelength light source 100 is configured to emit a dual-wavelength optical signal according to a received driving signal; the detection assembly 200 is used for receiving a first wavelength scattering signal, a second wavelength scattering signal, a first wavelength extinction signal and a second wavelength extinction signal which are generated after the dual-wavelength optical signal passes through the particles to be detected; and a signal processing component 300, configured to calculate a scattering coefficient according to the first wavelength scattering signal and the second wavelength scattering signal, calculate an extinction coefficient according to the first wavelength extinction signal and the second wavelength extinction signal, calculate a scattering extinction ratio according to the scattering coefficient and the extinction coefficient, and generate a smoke detection result according to the scattering coefficient, the extinction coefficient, and/or the scattering extinction ratio.
As shown in fig. 2, the dual-wavelength light source may be two light emitting diodes, preferably, the central wavelengths of the two light emitting diodes are 470nm and 940nm, respectively, wherein the scattering angle of 470nm is 60 degrees, and the scattering angle of 940nm is 115 degrees, or laser diodes with central wavelengths of 470nm and 940nm may be used, and by changing the angle arrangement, the scattering and extinction signals are collected simultaneously in a spatial solid angle manner, so that the light source may not be collimated by using a lens, and the output power is 15mW; the detection component can be a photoelectric detector which is used for converting diode light or laser light radiation irradiated on the surface of the detector into a current signal for measurement, the detector used in the invention is a photodiode, the measurable wavelength range is 300-1100nm, a band-pass filter is arranged in front of the photoelectric detector, and light with the central wavelength of 470nm or 940nm is selected to pass through; the signal processing assembly is used as the main control of the detection device and simultaneously comprises 12-bit DAC (Digital to Analog Converter) and ADC (Analog-to-Digital Converter) chip output and acquisition signals, wherein the DAC is used as a voltage modulation source to output constant voltage to drive a related circuit to be connected with a light source, and the ADC transfers the receiving current of the photoelectric detector to a subsequent circuit for corresponding processing.
Optionally, in some embodiments, the signal processing component 300 further includes: and a generating unit. Wherein the generating unit is used for generating the driving signal.
Specifically, the signal processing assembly drives the light source, the emitted light is scattered and extinguished by the detected particles, and the detected assembly receives the light and calculates the scattering coefficient, the extinction coefficient and the scattering extinction ratio through the signal processing assembly.
Optionally, in some embodiments, the signal processing component 300 further includes: the first calculation unit is used for calculating the ratio of the first wavelength scattering signal to the second wavelength scattering signal and obtaining a scattering coefficient according to the ratio; the second calculation unit is used for calculating a first difference value of the first wavelength extinction signal and the dual-wavelength optical signal and a second difference value of the second wavelength extinction signal and the dual-wavelength optical signal, and obtaining an extinction coefficient according to a logarithmic ratio of the second difference value of the prime numbers and the second difference value; and the third calculating unit is used for obtaining the scattering extinction ratio according to the ratio of the first wavelength scattering signal to the first wavelength extinction signal when the wavelengths of the first wavelength scattering signal and the first wavelength extinction signal are the same, or obtaining the scattering extinction ratio according to the ratio of the second wavelength scattering signal to the second wavelength extinction signal when the wavelengths of the second wavelength scattering signal and the second wavelength extinction signal are the same.
Specifically, the scattering coefficient is a ratio between two wavelength scattering signals, the extinction coefficient is a logarithmic ratio between the intensity difference of two wavelength extinction signals and the initial signal, and the scattering extinction ratio is a ratio between the same wavelength scattering signal and the extinction signal as shown in fig. 3. For the above three coefficients, the method shown in fig. 4 is referred to for the processing of the scattered signal and the extinction signal for each wavelength.
Optionally, in some embodiments, the scattering extinction ratio includes an infrared light scattering extinction ratio and a blue light scattering extinction ratio, the signal processing component further configured to: and when the scattering coefficient is less than or equal to a first preset threshold and the extinction coefficient is less than or equal to the first preset threshold, if the infrared light scattering extinction ratio and the blue light scattering extinction ratio are both second preset thresholds, responding to the smoke detection result as paraffin oil aerosol.
Wherein, the first preset threshold and the second preset threshold may be 1.5.
Specifically, in the embodiment of the present application, by comparing the corresponding scattering and extinction coefficients, the false alarm generated by the interfering particles such as dust and water mist is overcome, and the accuracy of the alarm is finally improved, wherein the alarm algorithm may calculate the scattering coefficient, the extinction coefficient, and the scattering extinction (infrared light scattering extinction ratio and blue light scattering extinction ratio) ratio by four coefficients as shown in fig. 4:
1. preferentially judging the scattering coefficient, comparing the scattering coefficient with a calibrated aerosol particle coefficient stored in the system, alarming if the scattering coefficient is greater than 1.5, and entering extinction coefficient judgment if the scattering coefficient is less than 1.5;
2. if the extinction coefficient is larger than 1.5, alarming, and if the extinction coefficient is smaller than 1.5, judging the scattering extinction ratio;
3. and the 940nm scattering extinction ratio and the 470nm scattering extinction ratio are both close to 1, the response is paraffin oil aerosol according to the national standard, and the other responses are not response, so that false alarm is avoided.
Optionally, in some embodiments, the alarm assembly comprises: the acoustic alarm unit is used for performing acoustic alarm when the smoke detection result meets a preset alarm condition; and/or the optical alarm unit is used for giving an optical alarm when the smoke detection result meets the preset alarm condition.
Optionally, in some embodiments, the preset alarm condition is that the scattering coefficient is greater than a first preset threshold, and/or the extinction coefficient is greater than a first preset threshold.
The acoustic alarm unit may be a buzzer or a speaker, which is not specifically limited herein, and the optical alarm unit may be an LED (Light Emitting Diode) lamp, which is not specifically limited herein.
Specifically, when the scattering coefficient is detected to be greater than 1.5 and/or the extinction coefficient is detected to be greater than 1.5, the acoustic alarm unit can emit the sound of 'dripping', and can also emit a warning sound effect, and the optical alarm unit can flash for a red LED lamp.
According to the fire smoke detector provided by the embodiment of the application, the double-wavelength light source multi-receiving channel is adopted, the signal change and the extinction signal change of the specific scattering angle of the double-wavelength light source are detected simultaneously, and three corresponding groups of scattering and extinction coefficients are obtained, so that whether a fire happens or not can be accurately judged, the alarm accuracy is improved, the false alarm is reduced, and the judgment on fire smoke particles and non-fire particles is more accurate by adding a group of extinction detection.
Next, a detection method of a fire smoke detector according to an embodiment of the present application will be described with reference to the drawings.
Fig. 5 is a flowchart of a detection method of a fire smoke detector according to an embodiment of the present application.
As shown in fig. 5, the detection method of the fire smoke detector includes the steps of:
in step S501, a dual-wavelength optical signal is emitted according to the received drive signal.
In step S502, a first wavelength scattered signal, a second wavelength scattered signal, a first wavelength extinction signal, and a second wavelength extinction signal generated after the dual-wavelength optical signal passes through the measured particle are received.
In step S503, a scattering coefficient is calculated according to the first wavelength scattering signal and the second wavelength scattering signal, an extinction coefficient is calculated according to the first wavelength extinction signal and the second wavelength extinction signal, and a scattering extinction ratio is calculated according to the scattering coefficient and the extinction coefficient, so as to generate a smoke detection result in the scattering coefficient, the extinction coefficient, and/or the scattering extinction.
Optionally, in some embodiments, the method for detecting a fire smoke detector further includes: judging whether the smoke detection result meets a preset alarm condition or not; and sending out an alarm signal when the smoke detection result meets a preset alarm condition.
Optionally, in some embodiments, the above method for detecting a fire smoke detector, which sends out an alarm signal when the smoke detection result satisfies a preset alarm condition, includes: when the smoke detection result meets a preset alarm condition, performing acoustic alarm; and/or, when the smoke detection result meets a preset alarm condition, performing optical alarm.
Optionally, in some embodiments, the preset alarm condition is that the scattering coefficient is greater than a first preset threshold, and/or the extinction coefficient is greater than a first preset threshold.
Optionally, in some embodiments, the scattering extinction ratio includes an infrared light scattering extinction ratio and a blue light scattering extinction ratio, and further includes: and when the scattering coefficient is less than or equal to a first preset threshold and the extinction coefficient is less than or equal to the first preset threshold, if the infrared light scattering extinction ratio and the blue light scattering extinction ratio are both second preset thresholds, responding to the smoke detection result as paraffin oil aerosol.
Optionally, in some embodiments, calculating a scattering coefficient from the first wavelength scattered signal and the second wavelength scattered signal, calculating an extinction coefficient from the first wavelength extinction signal and the second wavelength extinction signal, and calculating a scattering extinction ratio from the scattering coefficient and the extinction coefficient comprises: calculating the ratio of the first wavelength scattering signal to the second wavelength scattering signal, and obtaining a scattering coefficient according to the ratio; calculating a first difference value of the first wavelength extinction signal and the dual-wavelength optical signal, and a second difference value of the second wavelength extinction signal and the dual-wavelength optical signal, and obtaining an extinction coefficient according to a logarithmic ratio of the second difference value of the prime numbers and the second difference value; and when the wavelengths of the first wavelength scattering signal and the first wavelength extinction signal are the same, obtaining a scattering extinction ratio according to the ratio of the first wavelength scattering signal to the first wavelength extinction signal, or when the wavelengths of the second wavelength scattering signal and the second wavelength extinction signal are the same, obtaining the scattering extinction ratio according to the ratio of the second wavelength scattering signal to the second wavelength extinction signal.
It should be noted that the foregoing explanation of the embodiment of the fire smoke detector also applies to the detection method of the fire smoke detector of this embodiment, and details are not described here.
According to the detection method of the fire smoke detector provided by the embodiment of the application, the double-wavelength light source multiple receiving channels are adopted, the signal change and the extinction signal change of the specific scattering angle of the double-wavelength light source are detected simultaneously, and three corresponding groups of scattering and extinction coefficients are obtained, so that whether a fire occurs can be accurately judged, the alarm accuracy is improved, the false alarm is reduced, and the judgment on fire smoke particles and non-fire particles is more accurate by adding one group of extinction detection.
In the description of the present specification, reference to the description of "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or N embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "N" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more N executable instructions for implementing steps of a custom logic function or process, and alternate implementations are included within the scope of the preferred embodiment of the present application in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of implementing the embodiments of the present application.
It should be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the N steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: discrete logic circuits having logic gates for implementing logic functions on data signals, application specific integrated circuits having suitable combinational logic gates, programmable gate arrays, field programmable gate arrays, and the like.
It will be understood by those skilled in the art that all or part of the steps carried out in the method of implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and the program, when executed, includes one or a combination of the steps of the method embodiments.
While embodiments of the present application have been shown and described above, it will be understood that the above embodiments are exemplary and should not be construed as limiting the present application and that changes, modifications, substitutions and alterations in the above embodiments may be made by those of ordinary skill in the art within the scope of the present application.
Claims (13)
1. A fire smoke detector, comprising:
the dual-wavelength light source is used for sending out a dual-wavelength optical signal according to the received driving signal;
the detection assembly is used for receiving a first wavelength scattering signal, a second wavelength scattering signal, a first wavelength extinction signal and a second wavelength extinction signal which are generated after the dual-wavelength optical signal passes through the particles to be detected; and
and the signal processing component is used for calculating a scattering coefficient according to the first wavelength scattering signal and the second wavelength scattering signal, calculating an extinction coefficient according to the first wavelength extinction signal and the second wavelength extinction signal, calculating a scattering extinction ratio according to the scattering coefficient and the extinction coefficient, and generating a smoke detection result according to the scattering coefficient, the extinction coefficient and/or the scattering extinction ratio.
2. A fire smoke detector according to claim 1, further comprising:
the judging component is used for judging whether the smoke detection result meets a preset alarm condition or not;
and the alarm component is used for sending out an alarm signal when the smoke detection result meets the preset alarm condition.
3. A fire smoke detector according to claim 2, wherein the alarm assembly comprises:
the acoustic alarm unit is used for performing acoustic alarm when the smoke detection result meets the preset alarm condition;
and/or the optical alarm unit is used for giving an optical alarm when the smoke detection result meets the preset alarm condition.
4. A fire smoke detector according to claim 2 or 3, wherein the predetermined alarm condition is that the scattering coefficient is greater than a first predetermined threshold value, and/or that the extinction coefficient is greater than the first predetermined threshold value.
5. A fire smoke detector according to claim 4, wherein the scattering extinction ratio comprises an infrared light scattering extinction ratio and a blue light scattering extinction ratio, the signal processing component being further configured to:
and when the scattering coefficient is smaller than or equal to the first preset threshold and the extinction coefficient is smaller than or equal to the first preset threshold, if the infrared light scattering extinction ratio and the blue light scattering extinction ratio are both second preset thresholds, the smoke detection result response is paraffin oil aerosol.
6. The fire smoke detector of claim 5, wherein the signal processing assembly further comprises:
the first calculation unit is used for calculating the ratio of the first wavelength scattering signal to the second wavelength scattering signal and obtaining the scattering coefficient according to the ratio;
the second calculation unit is used for calculating a first difference value of the first wavelength extinction signal and the dual-wavelength optical signal, a second difference value of the second wavelength extinction signal and the dual-wavelength optical signal, and obtaining the extinction coefficient according to a logarithmic ratio of a second difference value of the prime number and the second difference value;
and the third calculating unit is used for obtaining the scattering extinction ratio according to the ratio of the first wavelength scattering signal to the first wavelength extinction signal when the wavelengths of the first wavelength scattering signal and the first wavelength extinction signal are the same, or obtaining the scattering extinction ratio according to the ratio of the second wavelength scattering signal to the second wavelength extinction signal when the wavelengths of the second wavelength scattering signal and the second wavelength extinction signal are the same.
7. A fire smoke detector according to claim 5 or 6, wherein said signal processing assembly further comprises:
a generating unit for generating the driving signal.
8. A method of detecting a fire smoke detector, using a fire smoke detector as claimed in any one of claims 1 to 7, the method comprising the steps of:
sending out a dual-wavelength optical signal according to the received driving signal;
receiving a first wavelength scattering signal, a second wavelength scattering signal, a first wavelength extinction signal and a second wavelength extinction signal which are generated after the dual-wavelength optical signal passes through the detected particles;
calculating a scattering coefficient according to the first wavelength scattering signal and the second wavelength scattering signal, calculating an extinction coefficient according to the first wavelength extinction signal and the second wavelength extinction signal, and calculating a scattering extinction ratio according to the scattering coefficient and the extinction coefficient, so as to generate a smoke detection result in the scattering coefficient, the extinction coefficient and/or the scattering extinction.
9. The method of claim 8, further comprising:
judging whether the smoke detection result meets a preset alarm condition or not;
and sending out an alarm signal when the smoke detection result meets the preset alarm condition.
10. The method of claim 9, wherein said issuing an alarm signal when said smoke detection result satisfies said preset alarm condition comprises:
when the smoke detection result meets the preset alarm condition, performing acoustic alarm;
and/or, when the smoke detection result meets the preset alarm condition, performing optical alarm.
11. The method according to claim 9 or 10, wherein the predetermined alarm condition is that the scattering coefficient is greater than a first predetermined threshold value, and/or that the extinction coefficient is greater than the first predetermined threshold value.
12. The method of claim 11, wherein the scattering extinction ratio comprises an infrared light scattering extinction ratio and a blue light scattering extinction ratio, further comprising:
and when the scattering coefficient is smaller than or equal to the first preset threshold and the extinction coefficient is smaller than or equal to the first preset threshold, if the infrared light scattering extinction ratio and the blue light scattering extinction ratio are both second preset thresholds, the smoke detection result response is paraffin oil aerosol.
13. The method of claim 12, wherein calculating a scattering coefficient from the first wavelength scattered signal and the second wavelength scattered signal, and calculating an extinction coefficient from the first wavelength extinction signal and the second wavelength extinction signal, and calculating a scattering extinction ratio from the scattering coefficient and the extinction coefficient comprises:
calculating the ratio of the first wavelength scattering signal to the second wavelength scattering signal, and obtaining the scattering coefficient according to the ratio;
calculating a first difference value of the first wavelength extinction signal and the dual-wavelength optical signal, a second difference value of the second wavelength extinction signal and the dual-wavelength optical signal, and obtaining the extinction coefficient according to a logarithmic ratio of a second difference value of the prime numbers and the second difference value;
and when the wavelengths of the first wavelength scattering signal and the first wavelength extinction signal are the same, obtaining the scattering extinction ratio according to the ratio of the first wavelength scattering signal to the first wavelength extinction signal, or when the wavelengths of the second wavelength scattering signal and the second wavelength extinction signal are the same, obtaining the scattering extinction ratio according to the ratio of the second wavelength scattering signal to the second wavelength extinction signal.
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