CN103593941A - Silicon carbide ultraviolet photoelectric tube based fire detector and fire detection method thereof - Google Patents
Silicon carbide ultraviolet photoelectric tube based fire detector and fire detection method thereof Download PDFInfo
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- CN103593941A CN103593941A CN201310433270.7A CN201310433270A CN103593941A CN 103593941 A CN103593941 A CN 103593941A CN 201310433270 A CN201310433270 A CN 201310433270A CN 103593941 A CN103593941 A CN 103593941A
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Abstract
The invention relates to the technical field of optical detection, and provides a silicon carbide ultraviolet photoelectric tube based fire detector which comprises a power supply module, a silicon carbide ultraviolet photoelectric tube, a CPU (central processing unit), a warning module and a serial communication module, wherein the power supply module is connected with the silicon carbide ultraviolet photoelectric tube, the CPU and the warning module to provide electric energy, the silicon carbide ultraviolet photoelectric tube is electrically connected with the CPU and outputs electric level to the CPU, the warning module is electrically connected with the CPU, the CPU judges a fire alarm occurs when variations of output level of the silicon carbide ultraviolet photoelectric tube within a fixed time period are consistent with a preset range, and the CPU drives the warning module to alarm and transmits fire alarm signals to an upper computer through the serial communication module. The invention further discloses a fire detection method of the silicon carbide ultraviolet photoelectric tube based fire detector. The ultraviolet photoelectric tube adopted in the invention is wide in spectral range, accurate in fire alarm detection, and strong in false alarm prevention ability. Temperature compensation is carried out through CPU sampling and calculating, thereby enabling the detection sensitivity of the ultraviolet photoelectric tube to remain the same in a wide temperature environment.
Description
Technical field
The present invention relates to optical detector technology field, particularly, relate to a kind of fire detector and fire detecting method thereof based on silit ultraviolet phototube.
Background technology
In the fire early-warning system that vehicle is conventional at present, piggyback pod is mainly that application heat-conduction principle is surveyed fire alarm, for example, use line formula flame sensor, and it is little that it feels fiery area, and sensitivity is not high yet.Along with scientific and technical progress and development, the application of optics is day by day broad, people carry out the early warning to fire by infrared light to the sensitivity of heat radiation perception, yet, due to the complexity of vehicle power cabin environment, infrared photosensitive components and parts are easily subject to the heat radiation impact of the generations such as engine and report by mistake.In addition, temperature has larger impact for the sensitivity of photosensitive components and parts, and temperature is lower, and sensitivity is higher, and for the wide temperature occasion that is applied to-40 ℃～+ 105 ℃, existing infrared optics detector cannot be accomplished the consistance of detection sensitivity.
Summary of the invention
For defect of the prior art, the object of this invention is to provide a kind of fire detector and fire detecting method thereof based on silit ultraviolet phototube, for to the accurately predicting of vehicle fire and alarm.
According to an aspect of the present invention, a kind of fire detector based on silit ultraviolet phototube is provided, it is characterized in that, comprise power module, silit ultraviolet phototube, CPU and alarm module, described power module respectively with described silit ultraviolet phototube, CPU is connected electric energy is provided with alarm module, described silit ultraviolet phototube is electrically connected to described CPU, described silit ultraviolet phototube output level is to described CPU, described alarm module is electrically connected to described CPU, the output level of described CPU judgement described silit ultraviolet phototube in fixed time period changes while conforming to preset range, be judged as fire alarm, described CPU drives described alarm module to report to the police.
Preferably, described ultraviolet phototube fire detector also comprises temperature-compensation circuit, described temperature-compensation circuit is connected to the A/D conversion port of described CPU, and described temperature-compensation circuit, for measures ambient temperature, is revised the output level of described silit ultraviolet phototube by described CPU.
Preferably, described temperature-compensation circuit comprises thermistor and divider resistance, described thermistor is that negative temperature coefficient sheet type 100K Ω thermistor is installed on surface, and the A/D conversion port of described CPU detects the voltage of described divider resistance end, and the reference value of silit ultraviolet phototube is revised.
Preferably, described ultraviolet phototube fire detector also comprises serial communication circuit and host computer, and described CPU communicates to connect by described serial communication circuit and described host computer, and described host computer is to the data analysis of described CPU and control CPU.
Preferably, described silit ultraviolet phototube is connected to the A/D conversion port of described CPU, the built-in amplifying circuit of described silit ultraviolet phototube, the output voltage of described silit ultraviolet phototube is 0 to 5V, spectral response range 230～the 285nm of described silit ultraviolet phototube, the temperature limit of silit ultraviolet phototube is-40 ℃ to+105 ℃.
Preferably, described power module comprises power supply and power filter change-over circuit.
Preferably, described alarm module is connected to the I/O port of described CPU, and described alarm module is by red LED lamp flash caution fire alarm.
According to another aspect of the present invention, provide a kind of fire detection method, comprise the steps:
The first step: the UV-irradiation in described silit ultraviolet phototube reception environment;
Second step: described silit ultraviolet phototube is to described CPU transmission level signal;
The 3rd step: the level signal that described CPU sends described silit ultraviolet phototube is carried out timing sampling;
The 4th step: described CPU, to described level signal and preset value contrast, when described level signal conforms to described preset value, is judged as fire alarm, enters the 5th step; When described level signal does not conform to described preset value, be judged as normally, enter the 6th step;
The 5th step: described alarm module prompting fire, returns to the 3rd step;
The 6th step: described alarm module prompting is normal, returns to the 3rd step.
Preferably, described alarm module is glimmered and is carried out fire alarm by red LED lamp; Described alarm module is glimmered and is carried out regular prompt by green LED lamp.
Compared with prior art, the present invention has following beneficial effect:
(1) spectral range of ultraviolet phototube is wide, surveys fire alarm accuracy rate high, and false alarm prevention capability is strong;
(2) by CPU sample, computing carries out temperature compensation, and the detection sensitivity of ultraviolet phototube is consistent under wide temperature environment;
(3) fully use the calculation process ability of CPU, carry out the work such as fault self-checking, intelligent degree is significantly improved;
(4) CPU is by serial communication module, can be in time by data information transfer such as duties to host computer, host computer is monitored CPU.
Accompanying drawing explanation
By reading the detailed description of non-limiting example being done with reference to the following drawings, it is more obvious that other features, objects and advantages of the present invention will become:
Fig. 1 is high-level schematic functional block diagram of the present invention;
Fig. 2 is electric source filter circuit schematic diagram of the present invention;
Fig. 3 is power-switching circuit schematic diagram of the present invention;
Fig. 4 is the circuit theory diagrams of silit ultraviolet phototube of the present invention;
Fig. 5 is temperature-compensation circuit schematic diagram of the present invention;
Fig. 6 is serial communication circuit schematic diagram of the present invention;
Fig. 7 is indicator light circuit schematic diagram of the present invention;
Fig. 8 is the FB(flow block) of fire detecting method of the present invention.
In figure: 1 is power supply, 2 is filtering change-over circuit, and 3 is silit ultraviolet phototube, and 4 is temperature-compensation circuit, and 5 is CPU, and 6 is serial communication circuit, and 7 is alarm module, and 8 is host computer, and S01-S06 is flow chart step.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in detail.Following examples will contribute to those skilled in the art further to understand the present invention, but not limit in any form the present invention.It should be pointed out that to those skilled in the art, without departing from the inventive concept of the premise, can also make some distortion and improvement.These all belong to protection scope of the present invention.
Referring to Fig. 1, the fire detector based on silit ultraviolet phototube comprises power module, silit ultraviolet phototube 3, temperature-compensation circuit 4, CPU5, serial communication circuit 6, alarm module 7 and the host computer 8 that power supply 1 and filtering change-over circuit 2 form.Power module is connected electric energy is provided with host computer 8 with silit ultraviolet phototube 3, CPU5 serial communication circuit 6, alarm module 7 respectively, silit ultraviolet phototube 3 is electrically connected to the A/D conversion port of CPU5, temperature-compensation circuit 4 is electrically connected to the A/D conversion port of CPU5, temperature-compensation circuit 4, for measures ambient temperature, is revised the output level of silit ultraviolet phototube 3 by CPU5.Temperature-compensation circuit 4 comprises thermistor and divider resistance, and thermistor is that negative temperature coefficient sheet type 100K Ω thermistor is installed on surface, and the A/D conversion port of CPU detects the voltage of divider resistance end, and the reference value of silit ultraviolet phototube is revised.After silit ultraviolet phototube 3 is subject to ultraviolet ray irradiation, output level exports CPU5 to, alarm module 7 is electrically connected to the I/O port of CPU5, when the output level variation of CPU judgement silit ultraviolet phototube 3 in fixed time period conforms to preset range, be judged as fire alarm, CPU5 drives alarm module 7 to report to the police.When the output level variation of CPU judgement silit ultraviolet phototube 3 in fixed time period does not conform to preset range, normal, CPU5 drives alarm module 7 to carry out safety instruction.CPU5 also can be by serial communication circuit 6 and host computer 8 communication connections, and the data analysis of 8 couples of CPU5 of host computer is also controlled CPU5.
Introduce in detail each functional module below.
Referring to Fig. 2,3, power filter, change-over circuit schematic diagram, fluctuate greatly, disturb many power environments in order to adapt to vehicle respectively, and power filter change-over circuit is comprised of power module 4NIC-DC5 and peripheral circuit thereof.Transition peak voltage in power filter filter out power, export 5V voltage stably and be transported to ultraviolet light sensing circuit, CPU and the required power supply of peripheral components work thereof are provided simultaneously.
Referring to Fig. 4, silit ultraviolet phototube is comprised of silit ultraviolet phototube and current-limiting resistance, is connected with the A/D conversion port of CPU, and ultraviolet phototube is HDSiC-UVC, spectral response range 230～285nm.Because the built-in amplifying circuit of this photoelectric tube, can avoid disturbing because of the signal that humid environment or electromagnetic radiation cause, ultraviolet signal can, with stable 0～5V Voltage-output, be directly connected with the A/D conversion port of CPU through current-limiting resistance.CPU carries out timing sampling for this A/D port level value, when sample output level in fixed time period, changes to be judged as and is subject to UV-irradiation, if level value meets this photoelectric tube ultraviolet detection physical characteristics, can be judged as fire alarm.
Referring to Fig. 5, temperature-compensation circuit schematic diagram is comprised of thermistor and divider resistance, is connected with the A/D conversion port of CPU, and wherein thermistor is that negative temperature coefficient sheet type 100K Ω thermistor is installed on surface.The A/D conversion port of CPU detects the voltage of divider resistance end, within the scope of-40 ℃～+ 105 ℃, be similar to linear change, by detecting the reference value that this magnitude of voltage can be subject to illumination to ultraviolet phototube judgement, revise, thereby guaranteed the consistance of detection sensitivity under wide temperature condition.
Cpu interface circuit is comprised of Freescale single-chip microcomputer MC9S12DP512, outer watchdog chip X5043S8I, 12MHz crystal oscillator, the download of BDM program, debugging interface and chip periphery resistance, electric capacity etc., the A/D conversion port of CPU and step-by-step counting port receive from above-mentioned antifouling testing circuit, voltage and pulse signal that ultraviolet light sensing circuit produces, the line item of going forward side by side.Outer watchdog chip X5043S8I can be restarted at the situation of the program fleet cpu reset of ordering.MC9S12DP512 is 16 mixed signal CPU, has powerful signal processing, calculation function and multiple, multiple bus interface.CPU detects antifouling detection magnitude of voltage PLT by A/D conversion port and whether high pressure test side magnitude of voltage UVCHK is too high or too low judges whether it breaks down; By serial ports, above-mentioned information is sent to host computer.
Referring to Fig. 6; serial communication circuit is comprised of serial port communication chip MAX232EPE and peripheral circuit thereof; wherein serial port communication chip MAX232EPE is connected with the two-way serial data sending and receiving end of described CPU; the data transmit-receive signal of CPU end is converted to rs 232 serial interface signal; provide the isolation of serial communication circuit power supply and data-signal, protection internal circuit simultaneously.
Referring to Fig. 7, alarm module is comprised of φ 5 double color luminotron L-59EGW-CA and current-limiting resistance, is connected with the I/O port of CPU, and when optical detector is working properly, the I/O mouth of CPU is controlled the every 5s flicker of green light once; When detecting fire alarm, the I/O mouth of CPU is controlled when red to warn.
Referring to Fig. 8, the concrete steps of the fire detection method of ultraviolet phototube fire detector are as follows:
The first step: the UV-irradiation in silit ultraviolet phototube reception environment (step S01 in figure).
Second step: silit ultraviolet phototube is to CPU transmission level signal (step S02 in figure).
The level signal that the 3rd step: CPU sends silit ultraviolet phototube is carried out timing sampling (step S03 in figure).
The 4th step: CPU, to level signal and preset value contrast, when level signal conforms to preset value, is judged as fire alarm, enters the 5th step; When level signal does not conform to preset value, be judged as normally, enter the 6th step (step S04 in figure).
The 5th step: alarm module prompting fire, returns to the 3rd step (step S05 in figure).Alarm module is glimmered and is carried out fire alarm by red LED lamp.
The 6th step: alarm module prompting is normal, returns to the 3rd step (step S06 in figure).Alarm module is glimmered and is carried out regular prompt by green LED lamp.
Above specific embodiments of the invention are described.It will be appreciated that, the present invention is not limited to above-mentioned specific implementations, and those skilled in the art can make various distortion or modification within the scope of the claims, and this does not affect flesh and blood of the present invention.
Claims (9)
1. the fire detector based on silit ultraviolet phototube, it is characterized in that, comprise power module, silit ultraviolet phototube, CPU and alarm module, described power module respectively with described silit ultraviolet phototube, CPU is connected electric energy is provided with alarm module, described silit ultraviolet phototube is electrically connected to described CPU, described silit ultraviolet phototube output level is to described CPU, described alarm module is electrically connected to described CPU, the output level of described CPU judgement described silit ultraviolet phototube in fixed time period changes while conforming to preset range, be judged as fire alarm, described CPU drives described alarm module to report to the police.
2. the fire detector based on silit ultraviolet phototube according to claim 1, it is characterized in that, described ultraviolet phototube fire detector also comprises temperature-compensation circuit, described temperature-compensation circuit is connected to the A/D conversion port of described CPU, described temperature-compensation circuit, for measures ambient temperature, is revised the output level of described silit ultraviolet phototube by described CPU.
3. the fire detector based on silit ultraviolet phototube according to claim 2, it is characterized in that, described temperature-compensation circuit comprises thermistor and divider resistance, described thermistor is that negative temperature coefficient sheet type 100K Ω thermistor is installed on surface, the A/D conversion port of described CPU detects the voltage of described divider resistance end, and the reference value of silit ultraviolet phototube is revised.
4. according to the fire detector based on silit ultraviolet phototube described in any one in claims 1 to 3, it is characterized in that, described ultraviolet phototube fire detector also comprises serial communication circuit and host computer, described CPU communicates to connect by described serial communication circuit and described host computer, and described host computer is to the data analysis of described CPU and control CPU.
5. according to the fire detector based on silit ultraviolet phototube described in any one in claims 1 to 3, it is characterized in that, described silit ultraviolet phototube is connected to the A/D conversion port of described CPU, the built-in amplifying circuit of described silit ultraviolet phototube, the output voltage of described silit ultraviolet phototube is 0 to 5V, spectral response range 230～the 285nm of described silit ultraviolet phototube, the temperature limit of silit ultraviolet phototube is-40 ℃ to+105 ℃.
6. according to the fire detector based on silit ultraviolet phototube described in any one in claims 1 to 3, it is characterized in that, described power module comprises power supply and power filter change-over circuit.
7. according to the fire detector based on silit ultraviolet phototube described in any one in claims 1 to 3, it is characterized in that, described alarm module is connected to the I/O port of described CPU, and described alarm module is by red LED lamp flash caution fire alarm.
8. a fire detection method for the fire detector based on silit ultraviolet phototube as described in any one in claim 1 to 7, is characterized in that, comprises the steps:
The first step: the UV-irradiation in described silit ultraviolet phototube reception environment;
Second step: described silit ultraviolet phototube is to described CPU transmission level signal;
The 3rd step: the level signal that described CPU sends described silit ultraviolet phototube is carried out timing sampling;
The 4th step: described CPU, to described level signal and preset value contrast, when described level signal conforms to described preset value, is judged as fire alarm, enters the 5th step; When described level signal does not conform to described preset value, be judged as normally, enter the 6th step;
The 5th step: described alarm module prompting fire, returns to the 3rd step;
The 6th step: described alarm module prompting is normal, returns to the 3rd step.
9. fire detecting method according to claim 8, is characterized in that, described alarm module is glimmered and carried out fire alarm by red LED lamp; Described alarm module is glimmered and is carried out regular prompt by green LED lamp.
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