CN117636559A - High-speed high-precision flame detection device and method - Google Patents
High-speed high-precision flame detection device and method Download PDFInfo
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Abstract
The invention discloses a high-speed high-precision flame detection device and a method, which belong to the technical field of flame detection and comprise the following steps: photoelectric detection subassembly, infrared detection subassembly, ultraviolet detection subassembly, central processing unit and alarm output unit. The invention solves the problems of low detection speed and high false alarm rate of the existing infrared and ultraviolet composite type multiband detector in the fields of hazardous chemicals production and fire prevention and explosion suppression application of military armored equipment. According to the invention, the problem of detection speed is solved by introducing the avalanche photodiode with high response speed, the dimming device is additionally arranged in front of the avalanche photodiode and only responds to the radiant light exceeding the set combustion temperature, so that false alarm is further reduced, the structure and the cost are similar to those of the conventional infrared and ultraviolet composite flame detection device, the composite judgment of three signals of light intensity, infrared and ultraviolet is fused in the detection method, the false alarm rate is reduced, and the purposes of high response speed and low false alarm rate can be realized.
Description
Technical Field
The invention relates to the technical field of flame detection, in particular to a high-speed high-precision flame detection device and method.
Background
When inflammable and explosive substances burn in a closed space, if explosion suppression measures cannot be found and taken in a very short time, serious accidents such as deflagration, explosion and the like can be generated, and huge personnel and property losses are caused; the flame detection device is used as the most basic and most important component part in the automatic fire alarming and extinguishing explosion suppression system, the detection of the flame needs to be completed in the shortest time possible, meanwhile, the explosion suppression process is usually carried out by filling explosion suppression agent in a closed space, certain damage can be generated to assets and personnel in the space, the fire extinguishing explosion suppression system cannot generate misoperation, and the flame detection device is required to generate no false alarm as far as possible.
There are various kinds of flame detecting devices, such as smoke sensing type, temperature sensing type, infrared type, and composite type. The traditional smoke-sensing type flame detector is mainly used for detecting slow-speed fire, and has longer response time;
in the field of high-speed flame detection, the main technical route is multi-band infrared and ultraviolet compound detection, and the multi-band infrared and ultraviolet compound detection is developed from the directions of a plurality of infrared sensors and ultraviolet sensors. The composite flame detection has formed more mature products, such as three-band and four-band infrared and infrared sensors, and in the fields of hazardous chemical production and fire and explosion suppression application of military armored equipment, extremely high requirements are put on the response speed and the alarm accuracy of the flame detector, the response speed index requirement is less than or equal to 2ms, and false alarms cannot be generated on interference sources such as sunlight, tungsten filament lamps and air heaters;
Because the ultraviolet sensor has self-excitation problem due to noise floor, the response speed of the pyroelectric and thermal resistance type infrared sensor is tens to hundreds us, the frequency of sampling effective signals in response time is insufficient, and the detection speed of the existing infrared ultraviolet composite type multiband detector is low and the false alarm rate is high in the fields of hazardous chemicals production and fire and explosion suppression of military armored equipment.
Disclosure of Invention
The invention aims to provide a high-speed high-precision flame detection device and a high-speed high-precision flame detection method, which can achieve the purposes of high response speed and low false alarm rate and solve the problems in the background technology.
In order to achieve the above purpose, the present invention provides the following technical solutions:
a high speed high precision flame detection device comprising:
the photoelectric detection component is used for detecting the heat radiation light of flame, attenuating the intensity of the input heat radiation light signal, enabling the avalanche photodiode to only respond to the heat radiation light exceeding the set temperature, and transmitting the output electric signal to the central processing unit for signal acquisition after following and amplifying;
the infrared detection component is used for receiving the heat radiation of the combustion products, determining the heat radiation optical signals of the combustion products, carrying out follow-up and amplification on the output electric signals, and transmitting the amplified electric signals to the central processing unit for signal acquisition;
The ultraviolet detection component is used for receiving ultraviolet radiation generated by the combustion object, enabling the electric signal output by the ultraviolet sensor circuit to form a high-voltage pulse electric signal, and transmitting the electric signal to the central processing unit for signal acquisition;
the central processing unit is used for collecting the electric signals transmitted by the photoelectric detection assembly, the infrared detection assembly and the ultraviolet detection assembly, carrying out operation processing on the collected electric signals transmitted by the photoelectric detection assembly, the infrared detection assembly and the ultraviolet detection assembly, and driving the alarm output unit to output alarm signals through the first input/output interface when the data operation unit is adopted to calculate flame generation;
and the alarm output unit is used for performing flame detection alarm and outputting the flame detection alarm in the forms of switching value, analog signals, digital signals and sound and light.
Preferably, the photodetection assembly includes:
an avalanche photodiode circuit for detecting heat radiation light of flame;
based on the high-speed response characteristic of the avalanche photodiode, detecting the heat radiation light of flame by adopting an avalanche photodiode circuit;
the dimming device is used for attenuating the intensity of an input heat radiation optical signal;
Attenuating the intensity of the input thermal radiation light signal based on the light attenuator so that the avalanche photodiode only responds to the thermal radiation light exceeding the set temperature;
a first amplifying circuit for following and amplifying the electric signal output from the avalanche photodiode circuit;
the electric signal output by the avalanche photodiode circuit is followed and amplified based on the first amplifying circuit, and the amplified electric signal is transmitted to the central processing unit for signal acquisition.
Preferably, the infrared detection assembly includes:
an infrared sensor circuit for receiving thermal radiation of the combustion products;
receiving heat radiation of the combustion products based on an infrared sensor with a specific response wave band, and determining heat radiation light signals of the combustion products;
the second amplifying circuit is used for following and amplifying the electric signal output by the infrared sensor circuit;
the electric signal output by the infrared sensor circuit is followed and amplified based on the second amplifying circuit, and the amplified electric signal is transmitted to the central processing unit for signal acquisition.
Preferably, the ultraviolet detection assembly includes:
an ultraviolet sensor circuit for receiving ultraviolet radiation generated by the combustion products;
The high-voltage generating circuit is used for enabling the electric signal output by the ultraviolet sensor circuit to form a high-voltage electric signal;
and the pulse shaping circuit is used for enabling the electric signal output by the ultraviolet sensor circuit to form a high-voltage pulse electric signal and transmitting the electric signal to the central processing unit for signal acquisition.
Preferably, the central processing unit includes:
the signal acquisition subunit is used for acquiring the thermal radiation optical signals of the combustion products monitored by the infrared detection assembly, and carrying out spectral analysis on the thermal radiation optical signals based on a preset spectral camera to obtain the distribution characteristics of the thermal radiation optical signals under different wavelengths;
a signal processing subunit configured to:
determining a radiation characteristic value of the thermal radiation optical signal based on the distribution characteristic, and determining a main signal of the thermal radiation optical signal in an imaging band range and a reference signal in a low attenuation band range based on the radiation characteristic value;
performing optical filtering processing on the thermal radiation optical signals based on the main signals and the reference signals to obtain target characteristic optical signals of combustion products, and performing photoelectric conversion on the target characteristic optical signals to obtain electric signals corresponding to the target characteristic optical signals;
acquiring configuration parameters of a preset amplifier, constructing an electric signal feedback mechanism based on the configuration parameters, and deploying the feedback mechanism in the preset amplifier;
Amplifying the electric signal based on the deployment result, and visually displaying the amplified electric signal in a preset coordinate system to obtain a target signal wave;
an operator subunit for:
acquiring a reference electric signal wave generated by flame, and overlapping and matching a target signal wave with the reference electric signal wave;
determining the fitting degree of the target signal wave and the reference signal wave based on the overlapping matching result, and comparing the fitting degree with a preset fitting degree threshold;
and when the fitting degree is larger than or equal to a preset fitting degree threshold value, judging that flame is generated, otherwise, judging that flame is not generated.
Preferably, the central processing unit includes:
the analog-to-digital conversion interface is used for collecting electric signals transmitted by the photoelectric detection assembly, the infrared detection assembly and the ultraviolet detection assembly;
the data operation unit is used for performing operation processing on the collected electric signals transmitted by the photoelectric detection assembly, the infrared detection assembly and the ultraviolet detection assembly;
the first input/output interface is used for establishing network connection between the central processing unit and the alarm output unit, and when the data operation unit is adopted to calculate flame generation, the alarm output unit is driven to output alarm signals through the first input/output interface.
Preferably, the alarm output unit includes:
the second input/output interface is used for establishing network connection between the alarm output unit and the central processing unit, wherein the second input/output interface is matched with the first input/output interface;
and outputting the received alarm signal in the form of switching value, analog signal, digital signal and sound and light through a second input/output interface, and performing flame detection alarm.
Preferably, the alarm output unit includes:
a data acquisition subunit configured to:
generating a data calling task based on the management terminal, and analyzing the data calling task to obtain the time attribute and the quantization index of the data to be called;
generating a data calling request based on the time attribute and the quantization index, traversing historical alarm data in a preset alarm database according to the data calling request by a data search engine of the preset alarm database, and obtaining target historical alarm data based on a traversing result;
a data analysis subunit for:
cleaning target historical alarm data, splitting the cleaned target historical alarm data to obtain N alarm data fragments, and equally dividing the N alarm data fragments based on a splitting result to construct a plurality of data comparison groups;
Analyzing each data comparison group based on the flame detection alarm rule to obtain a time sequence change rule of each data comparison group, and determining the feature similarity of the alarm data fragments in each data comparison group based on the time sequence change rule;
comparing the feature similarity of different data comparison groups, and determining the alarm feature of flame detection alarm based on the comparison result;
the alarm mechanism construction subunit is used for constructing a flame detection alarm mechanism based on alarm characteristics, deploying the flame detection alarm mechanism in a preset monitoring platform, and docking the preset monitoring platform with an alarm device based on deployment results.
Preferably, the alarm output unit comprises
The recording subunit is used for recording the total number of times of checking flame detection alarm in a preset time period and recording the total number of times of alarm and the total number of times of non-alarm in the total number of times of checking;
the first calculating subunit is used for calculating the accuracy rate of flame detection alarm based on the total alarm times and the total non-alarm times in the total checking times;
wherein μ represents the accuracy of flame detection alarm; x is X Alarm device Indicating the total number of alarms in the total number of checks; x is x r Representing the number of correct alarms in the total number of alarms, and x r ≤X Alarm device ；x w Indicating the number of false alarms in the total number of alarms, and x w ≤X Alarm device The method comprises the steps of carrying out a first treatment on the surface of the Y represents the total number of non-alarms in the total number of checks; y is r Indicating the number of times that no alarm has occurred in the total number of times of non-alarm, and y r ≤Y；y w Y is less than or equal to Y; m represents the total number of times of checking flame detection alarm in a preset time period, and M is more than or equal to x r +y r ；
The second calculating subunit is used for calculating the efficiency of the current flame detection alarm based on the accuracy of the flame detection alarm;
wherein phi represents the efficiency of the current flame detection and early warning; t (T) Datum Representing a preset reference time period from flame generation to alarm; t represents the fire generated fromFlame to the actual duration of the alarm;
a qualification determining subunit configured to:
comparing the efficiency of the current flame detection alarm with a preset efficiency threshold value, and judging whether the current flame detection alarm is qualified or not;
when the efficiency of the current flame detection alarm is equal to or greater than a preset efficiency threshold, judging that the current flame detection alarm is qualified;
otherwise, judging that the current flame detection alarm is not qualified.
According to another aspect of the present invention, there is provided a high-speed high-precision flame detection method, implemented based on a high-speed high-precision flame detection device as described above, comprising the steps of:
S1: initializing a system and reading the threshold value of each parameter;
s2: collecting signal intensity S of photoelectric sensor g ；
S3: calculating the change Diff of the signal intensity of the photoelectric sensor g The formula is as follows:
Diff g ＝S g -S g-1 ，
wherein S is g-1 The stored signal intensity of the last stored photoelectric sensor;
s4: if Diff is g >T1 and S g >T2 meets the triggering condition, and the step S5 is carried out, otherwise S is carried out g-1 ＝S g Returning to the step S2;
wherein, T1 and T2 are preset light intensity change and absolute light intensity threshold;
s5: continuously collecting sensor signals within a set time threshold T3 to obtain a photoelectric sensor signal intensity sequence A g Infrared sensor signal intensity sequence A ir And the pulse number P of the ultraviolet sensor uv Step S6 is carried out;
s6: computing sequence A by fast Fourier transform FFT g Frequency domain characteristics F of (2) g For sequence A ir Median filtering and calculating the mean value M ir Step S7 is carried out;
s7: judging fire condition, if F g >T4 and M ir >T5 and P uv >T6, turning to step S8, otherwise, returning to step S2;
wherein, T4, T5 and T6 are the preset frequency domain characteristics, the average value calculated after median filtering of the infrared sensor signal intensity sequence and the number of ultraviolet sensor pulses;
s8: outputting a fire alarm signal;
When the fire alarm signal is output, a user mobile terminal interface around the combustion object is obtained, flame detection alarm information is transmitted to the user, and the user is remotely warned.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the invention, by introducing the avalanche photodiode with high response speed, enough signal sampling is realized within ns-level detection time, the problem of detection speed is solved, the light-reducing device is additionally arranged in front of the avalanche photodiode and only responds to radiant light exceeding the set combustion temperature, the occurrence of false alarm is further reduced, the light-reducing device can be configured according to different application scenes, the structure and the circuit of the photoelectric detection assembly are relatively simple, the structure and the cost are similar to those of the conventional infrared and ultraviolet composite flame detection device, and the composite judgment of three signals of light intensity, infrared and ultraviolet is fused in the detection method, so that the false alarm rate is reduced, and the purposes of high response speed and low false alarm rate can be realized.
2. The method comprises the steps of carrying out spectral analysis on a thermal radiation optical signal through a preset spectral camera to accurately and effectively determine distribution characteristics of different wavelengths in the thermal radiation optical signal, determining signal composition of the thermal radiation optical signal through the distribution characteristics, carrying out optical filtering processing on the thermal radiation optical signal according to the signal composition to ensure the accuracy and the reliability of the finally obtained thermal radiation optical signal, finally converting a target characteristic optical signal after the optical filtering processing into a corresponding electric signal, carrying out signal wave analysis after carrying out following and amplifying processing on the electric signal, carrying out overlapping matching on a target signal wave obtained through analysis and a reference electric signal wave when flame is generated, and accurately and effectively judging whether flame is generated or not to ensure the accuracy and the reliability of the flame.
3. According to the method, the corresponding target historical alarm data are called from the preset alarm database according to the analysis result, the called target historical alarm data are analyzed, the accurate and effective determination of the alarm characteristics of the flame detection alarm is realized through the target historical alarm data, finally, the flame detection alarm mechanism is designated through the alarm characteristics and deployed in the preset monitoring platform, so that the electric signal operation result can be conveniently and rapidly and accurately judged in an alarm mode through the constructed flame detection alarm mechanism, meanwhile, the accuracy of the flame detection alarm is improved, and the false alarm rate is reduced.
4. The total number of times of flame detection alarm in the preset time period is determined, so that the total number of times of alarm and the total number of times of non-alarm in the total number of times of detection are recorded, the accuracy of flame detection alarm is effectively and accurately calculated, the efficiency of the current flame detection alarm is effectively calculated based on the accuracy of the flame detection alarm, the objectivity of the efficiency of calculating the current flame detection alarm is improved, whether the current flame detection alarm is qualified or not is effectively measured through the preset efficiency threshold, the monitoring accuracy of the flame detection alarm is improved, and the false alarm rate of the flame detection alarm is further reduced.
Drawings
FIG. 1 is a schematic diagram of the composition of a high-speed high-precision flame detection device of the present invention;
FIG. 2 is a flow chart of a high speed high precision flame detection method of the present invention;
fig. 3 is a schematic structural diagram of the high-speed and high-precision flame detection device of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In order to solve the problem of self excitation of the existing ultraviolet sensor due to noise floor, the response speed of the pyroelectric and thermal resistance type infrared sensor is tens to hundreds us, the frequency of sampling effective signals in response time is insufficient, the existing infrared and ultraviolet composite type multiband detector has the problems of low detection speed and high false alarm rate in the fields of hazardous chemicals production and fire and explosion suppression of military armored equipment, and referring to fig. 1-3, the embodiment provides the following technical scheme:
A high speed high precision flame detection device comprising:
the photoelectric detection component is used for detecting the heat radiation light of flame, attenuating the intensity of the input heat radiation light signal, enabling the avalanche photodiode to only respond to the heat radiation light exceeding the set temperature, and transmitting the output electric signal to the central processing unit for signal acquisition after following and amplifying;
the infrared detection component is used for receiving the heat radiation of the combustion products, determining the heat radiation optical signals of the combustion products, carrying out follow-up and amplification on the output electric signals, and transmitting the amplified electric signals to the central processing unit for signal acquisition;
the ultraviolet detection component is used for receiving ultraviolet radiation generated by the combustion object, enabling the electric signal output by the ultraviolet sensor circuit to form a high-voltage pulse electric signal, and transmitting the electric signal to the central processing unit for signal acquisition;
the central processing unit is used for collecting the electric signals transmitted by the photoelectric detection assembly, the infrared detection assembly and the ultraviolet detection assembly, carrying out operation processing on the collected electric signals transmitted by the photoelectric detection assembly, the infrared detection assembly and the ultraviolet detection assembly, and driving the alarm output unit to output alarm signals through the first input/output interface when the data operation unit is adopted to calculate flame generation;
And the alarm output unit is used for performing flame detection alarm and outputting the flame detection alarm in the forms of switching value, analog signals, digital signals and sound and light.
By adopting the technical scheme, through introducing the avalanche photodiode with high response speed, enough signal sampling is realized within ns-level detection time, the problem of detection speed is solved, the light-reducing device is additionally arranged in front of the avalanche photodiode, only the radiation light exceeding the set combustion temperature is responded, the occurrence of false alarm is further reduced, the light-reducing device can be configured according to different application scenes, the structure and the circuit of the photoelectric detection component are relatively simple, the structure and the cost are both close to those of the conventional infrared and ultraviolet composite flame detection device, the composite judgment of three signals of light intensity, infrared and ultraviolet is fused in the detection method, the false alarm rate is reduced, and the purposes of high response speed and low false alarm rate can be realized.
Specifically, the photoelectric detection component adopts an InGaAs photodiode, the response wavelength is 0.8-2.5um, and the response time is less than or equal to 40ns; the front end is additionally provided with a-20 db dimming lens, and an output signal is accessed to an AD1 port of the central processing unit after passing through the first amplifying circuit;
Specifically, the infrared detection component responds to the heat radiation of the combustion products by adopting an infrared tube with response wavelength of 2.7um, and the output signal is connected to an AD2 port of the central processing unit after passing through the second amplifying circuit;
specifically, the ultraviolet detection component adopts an ultraviolet tube with response wavelength of 0.185-0.26um, and is connected to an AD3 port of the central processing unit after passing through the pulse shaping circuit;
specifically, a core processor of the central processing unit adopts a microprocessor with a main frequency of more than 200MHz and a base ARM architecture, and comprises at least 3 AD ports;
specifically, the alarm output unit comprises relay output, network output and 485 output, which are respectively connected with an I/O port, a network port and a serial port of the central processing unit;
in this embodiment, the photodetection assembly includes:
an avalanche photodiode circuit for detecting heat radiation light of flame;
based on the high-speed response characteristic of the avalanche photodiode, detecting the heat radiation light of flame by adopting an avalanche photodiode circuit;
the dimming device is used for attenuating the intensity of an input heat radiation optical signal;
attenuating the intensity of the input thermal radiation light signal based on the light attenuator so that the avalanche photodiode only responds to the thermal radiation light exceeding the set temperature;
A first amplifying circuit for following and amplifying the electric signal output from the avalanche photodiode circuit;
the electric signal output by the avalanche photodiode circuit is followed and amplified based on the first amplifying circuit, and the amplified electric signal is transmitted to the central processing unit for signal acquisition.
It should be noted that, the avalanche photodiode is a high-sensitivity and high-response-speed photoelectric sensing device, and the response speed to the radiation light is ns-level, because the avalanche photodiode has high sensitivity, and is generally used for detecting weak light signals, and the high-power light signals can cause saturation or even damage;
in this embodiment, the intensity of the input optical power may be attenuated by the dimming means, so that the avalanche photodiode may also be used for detecting an optical signal of high power; by introducing the dimming device into the flame detection device, the avalanche photodiode can detect the light energy change caused by the radiant light generated by the high-temperature heat radiation at a high speed.
In this embodiment, the infrared detection assembly includes:
an infrared sensor circuit for receiving thermal radiation of the combustion products;
receiving heat radiation of the combustion products based on an infrared sensor with a specific response wave band, and determining heat radiation light signals of the combustion products;
The second amplifying circuit is used for following and amplifying the electric signal output by the infrared sensor circuit;
the electric signal output by the infrared sensor circuit is followed and amplified based on the second amplifying circuit, and the amplified electric signal is transmitted to the central processing unit for signal acquisition.
In this embodiment, the ultraviolet detection assembly includes:
an ultraviolet sensor circuit for receiving ultraviolet radiation generated by the combustion products;
the high-voltage generating circuit is used for enabling the electric signal output by the ultraviolet sensor circuit to form a high-voltage electric signal;
and the pulse shaping circuit is used for enabling the electric signal output by the ultraviolet sensor circuit to form a high-voltage pulse electric signal and transmitting the electric signal to the central processing unit for signal acquisition.
In this embodiment, the central processing unit includes:
the analog-to-digital conversion interface is used for collecting electric signals transmitted by the photoelectric detection assembly, the infrared detection assembly and the ultraviolet detection assembly;
the data operation unit is used for performing operation processing on the collected electric signals transmitted by the photoelectric detection assembly, the infrared detection assembly and the ultraviolet detection assembly;
the first input/output interface is used for establishing network connection between the central processing unit and the alarm output unit, and when the data operation unit is adopted to calculate flame generation, the alarm output unit is driven to output alarm signals through the first input/output interface.
In this embodiment, the alarm output unit includes:
the second input/output interface is used for establishing network connection between the alarm output unit and the central processing unit, wherein the second input/output interface is matched with the first input/output interface;
and outputting the received alarm signal in the form of switching value, analog signal, digital signal and sound and light through a second input/output interface, and performing flame detection alarm.
In order to better show a high-speed high-precision flame detection flow, the embodiment now provides a high-speed high-precision flame detection method, which is realized based on the high-speed high-precision flame detection device, and comprises the following steps:
s1: initializing a system and reading the threshold value of each parameter;
s2: collecting signal intensity S of photoelectric sensor g ；
S3: calculating the change Diff of the signal intensity of the photoelectric sensor g The formula is as follows:
Diff g ＝S g -S g-1 ，
wherein S is g-1 The stored signal intensity of the last stored photoelectric sensor;
s4: if Diff is g >T1 and S g >T2 meets the triggering condition, and the step S5 is carried out, otherwise S is carried out g-1 ＝S g Returning to the step S2;
wherein, T1 and T2 are preset light intensity change and absolute light intensity threshold;
s5: continuously collecting sensor signals within a set time threshold T3 to obtain a photoelectric sensor signal intensity sequence A g Infrared sensor signal intensity sequence A ir And the pulse number P of the ultraviolet sensor uv Step S6 is carried out;
s6: computing sequence A by fast Fourier transform FFT g Frequency domain characteristics F of (2) g For sequence A ir Median filtering and calculating the mean value M ir Step S7 is carried out;
s7: judging fire condition, if F g >T4 and M ir >T5 and P uv >T6, turning to step S8, otherwise, returning to step S2;
wherein, T4, T5 and T6 are the preset frequency domain characteristics, the average value calculated after median filtering of the infrared sensor signal intensity sequence and the number of ultraviolet sensor pulses;
s8: and outputting a fire alarm signal.
In this embodiment, when the fire alarm signal is output, the interface of the user mobile terminal around the combustion object is obtained, and the flame detection alarm information is transmitted to the user, so as to remotely early warn the user.
Working principle: the photoelectric detection assembly, the infrared detection assembly and the ultraviolet detection assembly are used for receiving heat radiation of combustion products, the received electric signals are transmitted to the central processing unit, the central processing unit is used for carrying out operation processing on the electric signals transmitted by the collected photoelectric detection assembly, the infrared detection assembly and the ultraviolet detection assembly, and when flame is generated through operation, the alarm output unit is driven to output alarm signals, so that the purposes of high response speed and low false alarm rate can be achieved.
The embodiment provides a high-speed high-precision flame detection device, the central processing unit includes:
the signal acquisition subunit is used for acquiring the thermal radiation optical signals of the combustion products monitored by the infrared detection assembly, and carrying out spectral analysis on the thermal radiation optical signals based on a preset spectral camera to obtain the distribution characteristics of the thermal radiation optical signals under different wavelengths;
a signal processing subunit configured to:
determining a radiation characteristic value of the thermal radiation optical signal based on the distribution characteristic, and determining a main signal of the thermal radiation optical signal in an imaging band range and a reference signal in a low attenuation band range based on the radiation characteristic value;
performing optical filtering processing on the thermal radiation optical signals based on the main signals and the reference signals to obtain target characteristic optical signals of combustion products, and performing photoelectric conversion on the target characteristic optical signals to obtain electric signals corresponding to the target characteristic optical signals;
acquiring configuration parameters of a preset amplifier, constructing an electric signal feedback mechanism based on the configuration parameters, and deploying the feedback mechanism in the preset amplifier;
amplifying the electric signal based on the deployment result, and visually displaying the amplified electric signal in a preset coordinate system to obtain a target signal wave;
An operator subunit for:
acquiring a reference electric signal wave generated by flame, and overlapping and matching a target signal wave with the reference electric signal wave;
determining the fitting degree of the target signal wave and the reference signal wave based on the overlapping matching result, and comparing the fitting degree with a preset fitting degree threshold;
and when the fitting degree is larger than or equal to a preset fitting degree threshold value, judging that flame is generated, otherwise, judging that flame is not generated.
In this embodiment, the preset spectrum camera is set in advance, and is configured to generate a spectrum corresponding to the thermal radiation optical signal, and analyze the spectrum to determine the signal wavelength distribution characteristic of the thermal radiation optical signal.
In this embodiment, the distribution characteristics are used to characterize the distribution of the spectrum of the heat radiation optical signal at different wavelengths, thereby facilitating the determination of the flame characteristics characterized by the heat radiation optical signal.
In this embodiment, the radiation characteristic value is a parameter for representing the intensity of heat radiation generated by the flame, and is a parameter for representing the degree of flame generation, wherein the degree of flame is in direct proportion to the degree of heat radiation.
In this embodiment, the primary signal refers to primary parameter information of flame intensity generated by combustion of a combustion object carried by the heat radiation optical signal.
In this embodiment, the low attenuation band range is a portion of an imaging region of the thermal radiation optical signal, i.e., an imaging region characterizing attenuation of the thermal radiation optical signal, wherein the reference signal is the thermal radiation optical signal in the imaging region of attenuation of the thermal radiation optical signal.
In this embodiment, the optical filtering process refers to filtering the thermal radiation optical signal, so as to remove an irrelevant optical signal in the thermal radiation optical signal, where the target characteristic optical signal is a result obtained by performing the optical filtering process on the thermal radiation optical signal, that is, the optical signal irrelevant to flame is not included.
In this embodiment, the preset amplifier is set in advance, and is used for performing following and amplifying processing on the electric signal, so as to facilitate operation on whether flame is generated.
In this embodiment, the configuration parameter refers to a defined parameter such as power of amplifying the electric signal by the preset amplifier, which is known in advance.
In this embodiment, the feedback mechanism is a mechanism that cooperates with the output electrical signal and the input electrical signal in the preset amplifier, in order to ensure that the output electrical signal changes with the change of the input electrical signal.
In this embodiment, the preset coordinate system is set in advance, and is used for visually displaying the electrical signal, where the target signal wave is the result of visually displaying the electrical signal in the preset coordinate system.
In this embodiment, the reference electric signal wave is set in advance, and is used for representing the corresponding electric signal wave when the flame is generated.
In this embodiment, the fitness is used to characterize the similarity of the target signal wave to the reference signal wave.
In this embodiment, the preset fitness threshold is set in advance, and is the lowest standard for measuring whether the target signal wave is similar to the reference signal wave, and can be adjusted.
The working principle and the beneficial effects of the technical scheme are as follows: the method comprises the steps of carrying out spectral analysis on a thermal radiation optical signal through a preset spectral camera to accurately and effectively determine distribution characteristics of different wavelengths in the thermal radiation optical signal, determining signal composition of the thermal radiation optical signal through the distribution characteristics, carrying out optical filtering processing on the thermal radiation optical signal according to the signal composition to ensure the accuracy and the reliability of the finally obtained thermal radiation optical signal, finally converting a target characteristic optical signal after the optical filtering processing into a corresponding electric signal, carrying out signal wave analysis after carrying out following and amplifying processing on the electric signal, carrying out overlapping matching on a target signal wave obtained through analysis and a reference electric signal wave when flame is generated, and accurately and effectively judging whether flame is generated or not to ensure the accuracy and the reliability of the flame.
The embodiment provides a high-speed high accuracy flame detection device, the alarm output unit includes:
a data acquisition subunit configured to:
generating a data calling task based on the management terminal, and analyzing the data calling task to obtain the time attribute and the quantization index of the data to be called;
generating a data calling request based on the time attribute and the quantization index, traversing historical alarm data in a preset alarm database according to the data calling request by a data search engine of the preset alarm database, and obtaining target historical alarm data based on a traversing result;
a data analysis subunit for:
cleaning target historical alarm data, splitting the cleaned target historical alarm data to obtain N alarm data fragments, and equally dividing the N alarm data fragments based on a splitting result to construct a plurality of data comparison groups;
analyzing each data comparison group based on the flame detection alarm rule to obtain a time sequence change rule of each data comparison group, and determining the feature similarity of the alarm data fragments in each data comparison group based on the time sequence change rule;
comparing the feature similarity of different data comparison groups, and determining the alarm feature of flame detection alarm based on the comparison result;
The alarm mechanism construction subunit is used for constructing a flame detection alarm mechanism based on alarm characteristics, deploying the flame detection alarm mechanism in a preset monitoring platform, and docking the preset monitoring platform with an alarm device based on deployment results.
In this embodiment, the data retrieval task is generated by the management terminal and is used for characterizing the data range to be retrieved and the data amount to be retrieved.
In this embodiment, the time attribute refers to the time range of data that needs to be retrieved, for example, historical alert data may be retrieved over the past month.
In this embodiment, the quantization index refers to the amount of data that needs to be fetched.
In this embodiment, the preset alarm database is set in advance, and is used for storing flame alarm data generated in different time periods.
In this embodiment, the data search engine is set in advance, and is a tool for traversing historical alarm data in a preset alarm database, where the historical alarm data is flame alarm data stored in the preset alarm database.
In this embodiment, the target historical alarm data refers to historical alarm data meeting the data retrieval task, and is part of a preset alarm database.
In this embodiment, the alarm data segments refer to data segments obtained by splitting the target historical alarm data, and each alarm data segment is one-time flame alarm data.
In this embodiment, the data comparison group refers to a data group obtained by equally dividing N pieces of alarm data, and the equally dividing may be equal dividing processing according to a preset data comparison group data amount.
In this embodiment, the flame detection alarm rules are known in advance, are used to characterize the conditions of the flame detection alarm, etc.
In this embodiment, the time sequence change rule refers to a value change rule presented by data in each data comparison group, a data structure composition change rule, and the like.
In this embodiment, the feature similarity is used to characterize the degree of similarity of the time sequence variation law between different data control groups, so as to facilitate the determination of the flame detection alarm feature.
In this embodiment, the alarm feature refers to a value feature and a data composition corresponding to data when the flame alarm condition is satisfied.
In this embodiment, the flame detection alarm mechanism is determined according to alarm characteristics, and is used for performing a flame alarm analysis process on the operation result, so as to quickly perform alarm analysis on the electric signal operation result.
In this embodiment, the preset monitoring platform is set in advance, and is a main body for performing flame detection alarm.
In this embodiment, the alarm device is set in advance and is a device that generates an alarm signal.
The working principle and the beneficial effects of the technical scheme are as follows: according to the method, the corresponding target historical alarm data are called from the preset alarm database according to the analysis result, the called target historical alarm data are analyzed, the accurate and effective determination of the alarm characteristics of the flame detection alarm is realized through the target historical alarm data, finally, the flame detection alarm mechanism is designated through the alarm characteristics and deployed in the preset monitoring platform, so that the electric signal operation result can be conveniently and rapidly and accurately judged in an alarm mode through the constructed flame detection alarm mechanism, meanwhile, the accuracy of the flame detection alarm is improved, and the false alarm rate is reduced.
The embodiment provides a high-precision flame detection device, the alarm output unit comprises
The recording subunit is used for recording the total number of times of checking flame detection alarm in a preset time period and recording the total number of times of alarm and the total number of times of non-alarm in the total number of times of checking;
The first calculating subunit is used for calculating the accuracy rate of flame detection alarm based on the total alarm times and the total non-alarm times in the total checking times;
wherein μ represents the accuracy of flame detection alarm; x is X Alarm device Indicating the total number of alarms in the total number of checks; x is x r Representing the number of correct alarms in the total number of alarms, and x r ≤X Alarm device ；x w Indicating the number of false alarms in the total number of alarms, and x w ≤X Alarm device The method comprises the steps of carrying out a first treatment on the surface of the Y represents the total number of non-alarms in the total number of checks; y is r Indicating the number of times that no alarm has occurred in the total number of times of non-alarm, and y r ≤Y；y w Y is less than or equal to Y; m represents the total number of times of checking flame detection alarm in a preset time period, and M is more than or equal to x r +y r ；
The second calculating subunit is used for calculating the efficiency of the current flame detection alarm based on the accuracy of the flame detection alarm;
wherein phi represents the efficiency of the current flame detection and early warning; t (T) Datum Representing a preset reference time period from flame generation to alarm; t represents the actual time period from flame generation to alarm;
a qualification determining subunit configured to:
comparing the efficiency of the current flame detection alarm with a preset efficiency threshold value, and judging whether the current flame detection alarm is qualified or not;
when the efficiency of the current flame detection alarm is equal to or greater than a preset efficiency threshold, judging that the current flame detection alarm is qualified;
Otherwise, judging that the current flame detection alarm is not qualified.
In this embodiment, the preset reference time period refers to an average time period required from the generation of flame to the alarm determination by a plurality of experiments.
In this embodiment, the preset efficiency threshold is set in advance, and is used to measure the criterion of whether the current flame detection alarm is qualified.
In the embodiment, when the flame detection alarm is unqualified, an alarm report can be generated and transmitted to the monitoring terminal, so that a monitoring person can adjust the flame detection alarm mechanism in real time.
In this embodiment, the preset time period is set in advance, for example, one hour, one day, or the like.
The working principle and the beneficial effects of the technical scheme are as follows: the total number of times of flame detection alarm in the preset time period is determined, so that the total number of times of alarm and the total number of times of non-alarm in the total number of times of detection are recorded, the accuracy of flame detection alarm is effectively and accurately calculated, the efficiency of the current flame detection alarm is effectively calculated based on the accuracy of the flame detection alarm, the objectivity of the efficiency of calculating the current flame detection alarm is improved, whether the current flame detection alarm is qualified or not is effectively measured through the preset efficiency threshold, the monitoring accuracy of the flame detection alarm is improved, and the false alarm rate of the flame detection alarm is further reduced.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. A high-speed high-precision flame detection device, comprising:
the photoelectric detection component is used for detecting the heat radiation light of flame, attenuating the intensity of the input heat radiation light signal, enabling the avalanche photodiode to respond to the heat radiation light exceeding the set temperature, and transmitting the output electric signal to the central processing unit for signal acquisition after following and amplifying the output electric signal;
The infrared detection component is used for receiving the heat radiation of the combustion products, determining the heat radiation optical signals of the combustion products, carrying out follow-up and amplification on the output electric signals, and transmitting the amplified electric signals to the central processing unit for signal acquisition;
the ultraviolet detection component is used for receiving ultraviolet radiation generated by the combustion object, enabling the electric signal output by the ultraviolet sensor circuit to form a high-voltage pulse electric signal, and transmitting the electric signal to the central processing unit for signal acquisition;
the central processing unit is used for collecting the electric signals transmitted by the photoelectric detection assembly, the infrared detection assembly and the ultraviolet detection assembly, carrying out operation processing on the collected electric signals transmitted by the photoelectric detection assembly, the infrared detection assembly and the ultraviolet detection assembly, and driving the alarm output unit to output alarm signals through the first input/output interface when the data operation unit is adopted to calculate flame generation;
and the alarm output unit is used for performing flame detection alarm and outputting the flame detection alarm in the forms of switching value, analog signals, digital signals and sound and light.
2. A high speed, high precision flame detection device as recited in claim 1, wherein said photodetection assembly comprises:
An avalanche photodiode circuit for detecting heat radiation light of flame;
based on the high-speed response characteristic of the avalanche photodiode, detecting the heat radiation light of flame by adopting an avalanche photodiode circuit;
the dimming device is used for attenuating the intensity of an input heat radiation optical signal;
attenuating the intensity of the input thermal radiation light signal based on the light attenuator so that the avalanche photodiode only responds to the thermal radiation light exceeding the set temperature;
a first amplifying circuit for following and amplifying the electric signal output from the avalanche photodiode circuit;
the electric signal output by the avalanche photodiode circuit is followed and amplified based on the first amplifying circuit, and the amplified electric signal is transmitted to the central processing unit for signal acquisition.
3. The high-speed and high-precision flame detection device of claim 2, wherein the infrared detection assembly comprises:
an infrared sensor circuit for receiving thermal radiation of the combustion products;
receiving heat radiation of the combustion products based on an infrared sensor with a specific response wave band, and determining heat radiation light signals of the combustion products;
the second amplifying circuit is used for following and amplifying the electric signal output by the infrared sensor circuit;
The electric signal output by the infrared sensor circuit is followed and amplified based on the second amplifying circuit, and the amplified electric signal is transmitted to the central processing unit for signal acquisition.
4. A high speed, high precision flame detection device as recited in claim 3, wherein said ultraviolet detection assembly comprises:
an ultraviolet sensor circuit for receiving ultraviolet radiation generated by the combustion products;
the high-voltage generating circuit is used for enabling the electric signal output by the ultraviolet sensor circuit to form a high-voltage electric signal;
and the pulse shaping circuit is used for enabling the electric signal output by the ultraviolet sensor circuit to form a high-voltage pulse electric signal and transmitting the electric signal to the central processing unit for signal acquisition.
5. The high-speed and high-precision flame detection device according to claim 4, wherein said central processing unit comprises:
the signal acquisition subunit is used for acquiring the thermal radiation optical signals of the combustion products monitored by the infrared detection assembly, and carrying out spectral analysis on the thermal radiation optical signals based on a preset spectral camera to obtain the distribution characteristics of the thermal radiation optical signals under different wavelengths;
a signal processing subunit configured to:
determining a radiation characteristic value of the thermal radiation optical signal based on the distribution characteristic, and determining a main signal of the thermal radiation optical signal in an imaging band range and a reference signal in a low attenuation band range based on the radiation characteristic value;
Performing optical filtering processing on the thermal radiation optical signals based on the main signals and the reference signals to obtain target characteristic optical signals of combustion products, and performing photoelectric conversion on the target characteristic optical signals to obtain electric signals corresponding to the target characteristic optical signals;
acquiring configuration parameters of a preset amplifier, constructing an electric signal feedback mechanism based on the configuration parameters, and deploying the feedback mechanism in the preset amplifier;
amplifying the electric signal based on the deployment result, and visually displaying the amplified electric signal in a preset coordinate system to obtain a target signal wave;
an operator subunit for:
acquiring a reference electric signal wave generated by flame, and overlapping and matching a target signal wave with the reference electric signal wave;
determining the fitting degree of the target signal wave and the reference signal wave based on the overlapping matching result, and comparing the fitting degree with a preset fitting degree threshold;
and when the fitting degree is larger than or equal to a preset fitting degree threshold value, judging that flame is generated, otherwise, judging that flame is not generated.
6. The high-speed and high-precision flame detection device of claim 5, wherein said central processing unit comprises:
the analog-to-digital conversion interface is used for collecting electric signals transmitted by the photoelectric detection assembly, the infrared detection assembly and the ultraviolet detection assembly;
The data operation unit is used for performing operation processing on the collected electric signals transmitted by the photoelectric detection assembly, the infrared detection assembly and the ultraviolet detection assembly;
the first input/output interface is used for establishing network connection between the central processing unit and the alarm output unit, and when the data operation unit is adopted to calculate flame generation, the alarm output unit is driven to output alarm signals through the first input/output interface.
7. The high-speed and high-precision flame detection device according to claim 6, wherein the alarm output unit comprises:
the second input/output interface is used for establishing network connection between the alarm output unit and the central processing unit, wherein the second input/output interface is matched with the first input/output interface;
and outputting the received alarm signal in the form of switching value, analog signal, digital signal and sound and light through a second input/output interface, and performing flame detection alarm.
8. The high-speed and high-precision flame detection device according to claim 7, wherein the alarm output unit comprises:
a data acquisition subunit configured to:
generating a data calling task based on the management terminal, and analyzing the data calling task to obtain the time attribute and the quantization index of the data to be called;
Generating a data calling request based on the time attribute and the quantization index, traversing historical alarm data in a preset alarm database according to the data calling request by a data search engine of the preset alarm database, and obtaining target historical alarm data based on a traversing result;
a data analysis subunit for:
cleaning target historical alarm data, splitting the cleaned target historical alarm data to obtain N alarm data fragments, and equally dividing the N alarm data fragments based on a splitting result to construct a plurality of data comparison groups;
analyzing each data comparison group based on the flame detection alarm rule to obtain a time sequence change rule of each data comparison group, and determining the feature similarity of the alarm data fragments in each data comparison group based on the time sequence change rule;
comparing the feature similarity of different data comparison groups, and determining the alarm feature of flame detection alarm based on the comparison result;
the alarm mechanism construction subunit is used for constructing a flame detection alarm mechanism based on alarm characteristics, deploying the flame detection alarm mechanism in a preset monitoring platform, and docking the preset monitoring platform with an alarm device based on deployment results.
9. The high-precision flame detection device according to claim 8, wherein the alarm output unit comprises
The recording subunit is used for recording the total number of times of checking flame detection alarm in a preset time period and recording the total number of times of alarm and the total number of times of non-alarm in the total number of times of checking;
the first calculating subunit is used for calculating the accuracy rate of flame detection alarm based on the total alarm times and the total non-alarm times in the total checking times;
wherein μ represents the accuracy of flame detection alarm; x is X Alarm device Indicating the total number of alarms in the total number of checks; x is x r Representing the number of correct alarms in the total number of alarms, and x r ≤X Alarm device ；x w Indicating the number of false alarms in the total number of alarms, and x w ≤X Alarm device The method comprises the steps of carrying out a first treatment on the surface of the Y represents the total number of non-alarms in the total number of checks; y is r Indicating the number of times that no alarm has occurred in the total number of times of non-alarm, and y r ≤Y；y w Y is less than or equal to Y; m represents the total number of times of checking flame detection alarm in a preset time period, and M is more than or equal to x r +y r ；
The second calculating subunit is used for calculating the efficiency of the current flame detection alarm based on the accuracy of the flame detection alarm;
wherein phi represents the efficiency of the current flame detection and early warning; t (T) Datum Representing a preset reference time period from flame generation to alarm; t represents the actual time period from flame generation to alarm;
a qualification determining subunit configured to:
comparing the efficiency of the current flame detection alarm with a preset efficiency threshold value, and judging whether the current flame detection alarm is qualified or not;
when the efficiency of the current flame detection alarm is equal to or greater than a preset efficiency threshold, judging that the current flame detection alarm is qualified;
otherwise, judging that the current flame detection alarm is not qualified.
10. A high-speed high-precision flame detection method based on the high-speed high-precision flame detection device as claimed in claim 9, characterized by comprising the following steps:
s1: initializing a system and reading the threshold value of each parameter;
s2: collecting signal intensity S of photoelectric sensor g ；
S3: calculating the change Diff of the signal intensity of the photoelectric sensor g The formula is as follows:
Diff g ＝S g -S g-1 ，
wherein S is g-1 The stored signal intensity of the last stored photoelectric sensor;
s4: if Diff is g >T1 and S g >T2 meets the triggering condition, and the step S5 is carried out, otherwise S is carried out g-1 ＝S g Returning to the step S2;
wherein, T1 and T2 are preset light intensity change and absolute light intensity threshold;
s5: continuously collecting sensor signals within a set time threshold T3 to obtain a photoelectric sensor signal intensity sequence A g Infrared sensor signal intensity sequence A ir And the pulse number P of the ultraviolet sensor uv Step S6 is carried out;
s6: computing sequence A by fast Fourier transform FFT g Frequency domain characteristics F of (2) g For sequence A ir Median filtering and calculating the mean value M ir Step S7 is carried out;
s7: judging fire condition, if F g >T4 and M ir >T5 and P uv >T6, turning to step S8, otherwise, returning to step S2;
wherein, T4, T5 and T6 are the preset frequency domain characteristics, the average value calculated after median filtering of the infrared sensor signal intensity sequence and the number of ultraviolet sensor pulses;
s8: outputting a fire alarm signal;
when the fire alarm signal is output, a user mobile terminal interface around the combustion object is obtained, flame detection alarm information is transmitted to the user, and the user is remotely warned.
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