CN1544896A - Flame alarm based on broad band gap semiconductor transducer - Google Patents
Flame alarm based on broad band gap semiconductor transducer Download PDFInfo
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- CN1544896A CN1544896A CNA2003101085901A CN200310108590A CN1544896A CN 1544896 A CN1544896 A CN 1544896A CN A2003101085901 A CNA2003101085901 A CN A2003101085901A CN 200310108590 A CN200310108590 A CN 200310108590A CN 1544896 A CN1544896 A CN 1544896A
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- broad band
- gap semiconductor
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Abstract
The invention is a broad band gap semiconductor sensor based flame alarm, composed of flame sensor, signal amplifying circuit, signal converting circuit, signal processing circuit, executing circuit, flame damper and acousto-optic alarm. Its character: the flame sensor is a broad band gap semiconductor sensor and has high-sensitivity output response only to the UV light in the flame whose wavelength is shorter than UVB and no response to sunlight and tungsten lamp, thus able to prevent other misalarms. It has simple structure, small bulk, low price, shock resistance, long service life, etc, and can be independently used and provide external communication port to compose system. It can meet different requirements of various fireproof occasions, especially applied to gas station, warehouse, and other places.
Description
Technical field
The present invention relates to a kind of ultraviolet radiation flame alarm technique of forming by semiconductor transducer etc., refer to the ultraviolet radiation fire alarm of forming by broad band gap semiconductor sensor etc. especially.
Background technology
Can in time find fire, no doubt rely on the one hand the vigilant of people, but neither each place, the people is all arranged in the tour activity any time, and the sensitivity of human sense organ is limited.So, also to carry out all the time supervision to the condition of a fire, in case breaking out of fire just can so that stamp out a fire early, avoid leading to major accident in time to people's report by various types of fire-alarms.
As everyone knows, when fire takes place, will inevitably be accompanied by and produce smog, high temperature and flame.And the generation of smog, high temperature, flame can cause that electric current, voltage or the mechanical part of some parts of the various types of fire-alarms that are arranged on the scene of fire change or displacement.Key equipment-detector (also being sensing head, probe) by fire-alarm receives above-mentioned variation, again by processes such as amplification, transmission, give the alarm, and can also send position, the place of wigwag and demonstration breaking out of fire simultaneously, in time allow people hear alarm sound, see alerting signal, in time find fire phenomena, stamp out a fire early, avoid causing personnel and property loss.
The detector of fire-alarm mainly divides sense cigarette, temperature-sensitive, flame optical radiation three major types.Wherein optical detector divides two kinds again.A kind of is the infrared radiation detector.Material is when burning, and the infrared radiation that is produced flicker by chemical reaction makes infrared optical sensor (as vulcanized lead) induction, is transformed into electric signal, after amplifying, just can report to the police to people.Another kind is the ultraviolet radiation detector, is the ultraviolet light in the flame when utilizing burning, makes uv-sensitive component (as ultraviolet light sensing tube) induction, is transformed into electric signal, by relay etc., just can open the on-off circuit warning.Uv-sensitive component generally adopts ultraviolet light sensing tube at present, but ultraviolet light sensing tube needs the 300V high voltage supply, and volume is big, and glass shell is broken easily.Also useful semiconductor silicon is as uv-sensitive component, but the filtration unit of stray light must be set.This filtration unit is made up of a series of optical filters, complex structure, and the fringe cost height, installation accuracy requires high.
Summary of the invention
The objective of the invention is to disclose a kind of simple in structure, with low cost, small and exquisite durable, can survey flame rapidly and in time send fire alarm alerting signal, particularly can false alarm.
The objective of the invention is to realize by following technical solution: comprise flame sensor, signal amplification circuit, signaling conversion circuit, signal processing circuit, executive circuit, flame snuffer, audible-visual annunciator.Executive circuit one end is connected with flame snuffer with audible-visual annunciator, and the other end is connected with signal processing circuit; The single-chip microcomputer of the running program that signal processing circuit is write for the warning index of the data that obtain according to signaling conversion circuit and setting; Signal processing circuit is connected with signal amplification circuit by signaling conversion circuit; Signal amplification circuit is connected with flame sensor, be characterized in: flame sensor is a broad band gap semiconductor sensor, this broad band gap semiconductor sensor can accurately be surveyed the ultraviolet light that the flame medium wavelength is shorter than UVB, and make ultraviolet light direct connect conversion to produce current signal, and be that ultraviolet light and the visible light of UVB, UVA do not have response to other frequencies.The current signal that signal amplification circuit detects flame sensor and change amplifies the back and produces a voltage signal, make the signaling conversion circuit that is attached thereto through the A/D conversion, convert above-said current signal to digital signal, these information are sent into single-chip microcomputer and are carried out signal Processing, comprise that spectrum analysis, sensitivity regulates automatically, send instruction by having or not abnormal conditions to executive circuit: in case breaking out of fire, form the relay conducting of executive circuit, drive connected flame snuffer, audible-visual annunciator carry out sound and light alarm also (or) self-extinguishing.
Advantage of the present invention is as follows:
1. because the present invention has adopted broad band gap semiconductor sensor, compare, overcome the drawback that needs the high direct voltage power supply, solved the security hidden trouble that high voltage brings with the ultraviolet radiation detector that the ultraviolet fulgurite is formed.Compare with the Ultraviolet sensor fire alarm that semiconductor silicon is formed, saved a series of optical filters that are used for filtering, make designs simplification, volume is little, price is low, vibration resistance, life-span are long.
2. because the wide band gap semiconducter that the present invention adopts only has highly sensitive response output to the ultraviolet light of wavelength between 180 nanometer to 260 nanometers or 280 nanometers, and to daylight or tungsten lamp without any response, thereby can prevent false alarm except that flame.Because the broad band gap semiconductor sensor frequency response is fast, can also carries out frequency analysis and judge whether to find flame in addition, make fire alarm reliability of the present invention good especially.
3. because the present invention can adopt a plurality of highly sensitive broad band gap semiconductor sensor easily, therefore can the comprehensive detection condition of a fire, do not stay the dead angle.And external communication ports can be provided, can make a plurality of alarms form system, the unified use.
4. because signal processing circuit of the present invention is made up of commercially available single-chip microcomputer etc., processing power is strong, means are simple, directly perceived, index is stablized, reliable, can satisfy the different disposal requirement of various occasions.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Fig. 2 is the structural representation of flame sensor of the present invention, signal amplification, conversion, processing, executive circuit
Embodiment
See also accompanying drawing 1.The present invention is made up of flame sensor 1, signal amplification circuit 2, signaling conversion circuit 3, signal processing circuit 4, executive circuit 5, flame snuffer 6, audible-visual annunciator 7.Be characterized in that flame sensor 1 is the cheap broad band gap semiconductor sensor of up-to-date development (as aluminum gallium nitride AlGaN).The ultraviolet light (ultraviolet light of wavelength between 180 nanometer to 260 nanometers or 280 nanometers) that this broad band gap semiconductor sensor can be only be shorter than UVB to the flame medium wavelength has highly sensitive response output, and be that the ultraviolet light of UVB, UVA and visible light (as daylight or tungsten lamp) are without any response to other frequencies, thereby can prevent the false alarm except that flame, pointed strong characteristic.This broad band gap semiconductor sensor must could produce induction with the filtering apparatus coupling of being made up of a series of optical filters unlike the narrower silicon semiconductor sensor of band gap simultaneously.In a word, through experiment showed, that repeatedly broad band gap semiconductor sensor of the present invention can remove the sensor that filtering apparatus directly detects as flame.Because the broad band gap semiconductor sensor frequency response is fast, can also carries out frequency analysis and judge whether that flame takes place in addition.
See also accompanying drawing 2, the present invention utilizes at least 1 (to be provided with 2 among the figure first, configurable 8) can accurately survey the broad band gap semiconductor sensor of the ultraviolet light in the flame as flame sensor 1, and at least 1 of matching (is provided with 2 among the figure, configurable 8), voltage is+signal amplification circuit 2 of 5V connects, sort signal amplifying circuit 2 is made up of operational amplifier and peripheral resistor network, the inverting input of operational amplifier is connected with the positive pole of flame sensor 1, its in-phase input end is by balance resistance 15 ground connection, its output terminal divides two-way, one the tunnel directly is connected with signaling conversion circuit 3, another road is passed through by resistance 12,13,14 resistor networks of forming connect, and feed back to the inverting input of operational amplifier.Form the specifications and models of the resistance 12,13,14 of resistor network and calculate coupling routinely.So, broad band gap semiconductor sensor is detected ultraviolet light direct in the flame switch through and be current signal, amplify and become voltage signal by operational amplifier.Signal amplification circuit 2 output terminals and voltage are connected for the input end of the signaling conversion circuit 3 of+5V, signaling conversion circuit 3 is selected the A/D conversion circuit of MAX197 for use, convert analog voltage signal to digital voltage signal, and be connected with signal processing circuit 4 by bus.Signal processing circuit 4 is commercially available single-chip microcomputer (for example 8051), by written program in the single-chip microcomputer (comprising spectrum analysis, the automatic adjusting of sensitivity etc.), provide and carry out signal (being provided with 8 tunnel among the figure), the output terminal of signal processing circuit 4 is connected with executive circuit 5, and executive circuit 5 comprises triode 9 and relay 10.The output terminal of information-processing circuit 4 is connected with relay 10 with triode 9 by dropping resistor 8, so that according to the output situation after flame sensor 1, signal amplification circuit 2, signaling conversion circuit 3, signal processing circuit 4 actual detection, amplification, conversion, the processing, make relay 10 conductings or disconnection: if there is not the condition of a fire, relay 10 disconnects; If breaking out of fire according to the signal of signal processing circuit 4 output, makes triode 9 and relay 10 conductings, just can drive the flame snuffer 6, the audible-visual annunciator 7 that are connected with relay 10 carry out sound and light alarm also (or) self-extinguishing.The endpiece of information-processing circuit 4 also is provided with communication port 11, so that make a plurality of alarms form system by communication port 11, forms network, the unified use.
Principle of work: broad band gap semiconductor sensor is insensitive to the ultraviolet light that visible light and the sun are mapped to ground.Only when fire occurs, it can not need the filtering apparatus direct detection to be shorter than the ultraviolet light of UVB to the wavelength in the flame, and generation electric current, after amplifying, operational amplifier produces a magnitude of voltage, convert digital quantity to by A/D conversion chip again, then send into single-chip microcomputer and handle, last according to the program output signal of setting in the single-chip microcomputer, drive executive circuit carry out sound and light alarm also (or) self-extinguishing.
Claims (1)
1. the fire alarm based on broad band gap semiconductor sensor comprises flame sensor (1), signal amplification circuit (2), signaling conversion circuit (3), signal processing circuit (4), executive circuit (5), flame snuffer (6) and audible-visual annunciator (7); Executive circuit (5) one ends are connected with audible-visual annunciator (7), flame snuffer (6), and the other end is connected with signal processing circuit (4); Signal processing circuit (4) is a single-chip microcomputer, and signal processing circuit (4) is connected with signal amplification circuit (2) by signaling conversion circuit (3); Signal amplification circuit (2) is connected with flame sensor (1), it is characterized in that: flame sensor (1) is broad band gap semiconductor sensor, it can accurately survey the ultraviolet light that the flame medium wavelength is shorter than UVB, and make ultraviolet light direct connect conversion to produce current signal, and be that the ultraviolet light of UVB, UVA does not have response to other frequencies.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2003101085901A CN1544896A (en) | 2003-11-12 | 2003-11-12 | Flame alarm based on broad band gap semiconductor transducer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2003101085901A CN1544896A (en) | 2003-11-12 | 2003-11-12 | Flame alarm based on broad band gap semiconductor transducer |
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| Publication Number | Publication Date |
|---|---|
| CN1544896A true CN1544896A (en) | 2004-11-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2003101085901A Pending CN1544896A (en) | 2003-11-12 | 2003-11-12 | Flame alarm based on broad band gap semiconductor transducer |
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| CN (1) | CN1544896A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102254399A (en) * | 2011-07-05 | 2011-11-23 | 吴江多艺纺织有限公司 | Fire alarm system for textile workshop |
| CN104217527A (en) * | 2014-08-21 | 2014-12-17 | 江门市丰鸣达科技有限公司 | Fire dual detection alarm device and method |
| CN104504838A (en) * | 2014-12-15 | 2015-04-08 | 长春理工大学 | Ultraviolet flame detector adopting zinc oxide-based semiconductor film |
| CN106225923A (en) * | 2016-09-05 | 2016-12-14 | 吕旭升 | A kind of ultraviolet dosage index measurement devices and methods therefor |
-
2003
- 2003-11-12 CN CNA2003101085901A patent/CN1544896A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102254399A (en) * | 2011-07-05 | 2011-11-23 | 吴江多艺纺织有限公司 | Fire alarm system for textile workshop |
| CN104217527A (en) * | 2014-08-21 | 2014-12-17 | 江门市丰鸣达科技有限公司 | Fire dual detection alarm device and method |
| CN104504838A (en) * | 2014-12-15 | 2015-04-08 | 长春理工大学 | Ultraviolet flame detector adopting zinc oxide-based semiconductor film |
| CN106225923A (en) * | 2016-09-05 | 2016-12-14 | 吕旭升 | A kind of ultraviolet dosage index measurement devices and methods therefor |
| CN106225923B (en) * | 2016-09-05 | 2018-01-12 | 吕旭升 | A kind of ultraviolet dosage index measurement devices and methods therefor |
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |