CN201600190U - Ultraviolet flame detection system - Google Patents
Ultraviolet flame detection system Download PDFInfo
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- CN201600190U CN201600190U CN2009202149941U CN200920214994U CN201600190U CN 201600190 U CN201600190 U CN 201600190U CN 2009202149941 U CN2009202149941 U CN 2009202149941U CN 200920214994 U CN200920214994 U CN 200920214994U CN 201600190 U CN201600190 U CN 201600190U
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Abstract
An ultraviolet flame detection system comprises an ultraviolet flame probe and a flame signal processing system connected with the same, wherein the flame signal processing system includes an analog-to-digital conversion circuit connected with the ultraviolet flame probe, and a digital signal processor connected with the analog-to-digital conversion circuit. The ultraviolet flame probe aims to detect ultraviolet radiation in flame of an object, thereby avoiding 'peeping' generated by background flame interference in a traditional flame probe, and increasing accurateness and interference resistance of detection. The flame signal processing system converts acquired analog flame signals into digital signals and carries out digital filtering and spectral analysis, and utilizes characteristic of flame flickering characteristic frequency to determine flame combustion statuses through spectral signals, thereby greatly increasing background flame resistance of a flame detection system, and outputting more accurate and reliable flame statues.
Description
Technical field
The utility model relates to a kind of flame detector system, relates to a kind of flame detector system that is used for the flame detection UV radiation specifically.
Background technology
In the flame detector system, when the target flame in the tested boiler in burning or when extinguishing state, the electrical signal intensity of boiler flame detection probe output should have tangible difference, helps the state of the tested target flame of boiler flame signal amplifier accurate recognition like this.Traditional boiler flame detection probe is generally the infrared ray flame-detecting probe.
Because relatively cleaner, bright during gas fuel combustion, the flue dust that the flame edge produces during not as coal dust or oil inflame, and this flue dust can absorb the infrared radiation of flame effectively.When the boiler of using gases fuel is carrying out flame when detecting, after the tested target fray-out of flame, because other just do not produce flue dust at burned flame, the infrared radiation of these flames is not absorbed effectively, therefore, if utilize the infrared ray flame-detecting probe that receives infrared radiation to detect the gas flame of gas fired-boiler, though the infrared radiation of target flame has not had, but still can detect the infrared radiation (as infrared radiation of opposite flame etc.) of background flame, and the energy the when infrared energy of these background flames and target flame combustion is suitable, cause before and after the target fray-out of flame, the signal intensity of flame-detecting probe output is significantly difference not, make the boiler flame signal amplifier can't discern tested target flame and extinguish, thereby produce " stealing a glance at " phenomenon.
In addition, in traditional flame detector system, adopt the flare up fire amplifier that the target flame electric signal that is received is carried out following processing usually:
1. remove the flip-flop in the tested target flame electric signal;
2. the alternating component in the tested target flame electric signal is converted to absolute value;
3. this absolute value be multiply by behind the coefficient of a setting as tested target flame relative intensity value output;
With this relative intensity value with the burning set with extinguish value comparison, judge and export tested target flame combustion or extinguish status signal.
Yet, because background Fire Radiation meeting is in the undesired signal that in varying degrees tested target flame electric signal is produced other frequencies except that characteristic frequency in the boiler, be converted to absolute value if will contain the alternating component of the tested target flame electric signal of the Fire Radiation interference of having powerful connections simply, thereby error appears in tested target flame relative intensity value sometimes that calculate, tested target flame burning or extinguish state occur sometimes the erroneous judgement.Therefore, there is certain defective in above-mentioned tested target flame electric signal disposal route.
Summary of the invention
The purpose of this utility model provides a kind of ultraviolet flame detection system, change the ultraviolet energy of target Fire Radiation into electric signal output, and to output electric signal nurse one's health and spectrum analysis, thereby the status signal that detects the target flame combustion more accurately and effectively or extinguish is avoided the generation of flase drop situation.
The utility model in order to achieve the above object, the technical scheme of being taked is:
A kind of ultraviolet flame detection system is provided, comprise the ultraviolet flame detection probe, the flare up fire disposal system that is connected with the ultraviolet flame detection probe, described flare up fire disposal system comprises the analog to digital conversion circuit that is connected with the ultraviolet flame detection probe, the digital signal processor that is connected with analog to digital conversion circuit.
Further, described flame-detecting probe comprises the collector lens that is set in turn on the same light path, ultraviolet light transmission piece and UV photodetector.
Described UV photodetector comprises the ultraviolet light photo sensor, the current-to-voltage converting circuit that is connected with the ultraviolet light photo sensor, the block isolating circuit that is connected with current-to-voltage converting circuit, the voltage signal amplifying circuit that is connected with block isolating circuit, with the low-pass filter circuit that the voltage signal amplifying circuit is connected, the output terminal of described low-pass filter circuit is connected with analog to digital conversion circuit in the flare up fire disposal system.
Digital signal processor in the described flare up fire disposal system comprises the low-pass digital filter module that is connected with analog to digital conversion circuit, the spectrum analysis module that is connected with lowpass digital filter, the flame judge module that is connected with spectrum analysis module.
The advantage of the utility model ultraviolet flame detection probe is:
● as above-mentioned structure, the utility model adopts the ultraviolet flame detection probe to detect at the UV radiation in the target flame, because gaseous fuel when burning, can produce one deck water vapour at its flame edge, this layer water vapour can absorb the ultraviolet radiation of flame effectively.Therefore, when selecting the target flame of ultraviolet flame detection probe detected gas fuel combustion for use, when the target fray-out of flame, though background flame is still in burning, but because the absorption of water vapor, signal energy when the ultraviolet flame detection probe detects background flare up fire energy and is lower than the target flame combustion, promptly the ultraviolet flame detection probe at flame combustion or when extinguishing the signal intensity of output tangible difference is arranged, thereby avoided the generation of " stealing a glance at " phenomenon.
● as above-mentioned structure, the utility model adopts the flare up fire disposal system that the simulating flame conversion of signals that collects is become digital signal and handles, utilize the singularity of tested target flame flicking characteristic frequency, the time-domain signal that target flame sampling can be come by Digital Signal Processing, be converted to frequency-region signal, distribution of amplitudes and standard flame source by frequency-region signal distribute to recently judging having or not of flame, improved the anti-background flame of flame detector system interference capability greatly, relatively flame intensity and flame combustion or to extinguish the output of state more accurate, reliably.
Description of drawings
Fig. 1 is the structural representation of the utility model ultraviolet flame detection system one embodiment;
Fig. 2 is the structural representation of the utility model ultraviolet flame detection system middle-ultraviolet lamp flame-detecting probe one embodiment;
Fig. 3 is the electrical schematic diagram of the utility model ultraviolet flame detection system medium ultraviolet photodetector one embodiment;
Fig. 4 is the structural representation of flame signal processing system one embodiment in the utility model ultraviolet flame detection system;
Fig. 5 is the electrical schematic diagram of flame signal processing system one embodiment in the utility model ultraviolet flame detection system;
Fig. 6 is the workflow diagram of flame signal processing system one embodiment in the utility model ultraviolet flame detection system.
Embodiment
Further specify the architectural feature of the utility model ultraviolet flame detection system below in conjunction with drawings and Examples.
Fig. 1 is the structural representation of the utility model ultraviolet flame detection system one embodiment.As shown in Figure 1, the utility model ultraviolet flame detection system, comprise ultraviolet flame detection probe 1, the flare up fire disposal system 2 that is connected with ultraviolet flame detection probe 1, described flare up fire disposal system 2 comprises the analog to digital conversion circuit 21 that is connected with ultraviolet flame detection probe 1, the digital signal processor 22 that is connected with analog to digital conversion circuit 21.
Further, described flame-detecting probe 1 comprises the collector lens 11 that is set in turn on the same light path, ultraviolet light transmission piece 12 and UV photodetector 13.
Described UV photodetector 13 comprises ultraviolet light photo sensor 131, the current-to-voltage converting circuit 132 that is connected with ultraviolet light photo sensor 131, the block isolating circuit 133 that is connected with current-to-voltage converting circuit 132, the voltage signal amplifying circuit 134 that is connected with block isolating circuit 133, the low-pass filter circuit 135 that is connected with voltage signal amplifying circuit 134, the output terminal of described low-pass filter circuit 135 is connected with analog to digital conversion circuit 21 in the flare up fire disposal system 2.
Described flare up fire disposal system also comprises storer 23, code translator 24 and the I/O interface circuit 25 that digital signal processor is connected.
Fig. 2 is the structural representation of the utility model ultraviolet flame detection system middle-ultraviolet lamp flame-detecting probe 1 one embodiment.As shown in Figure 2, when flame detection, the collector lens 11 in the ultraviolet flame detection probe 1 (in this example, adopting quartz lens) is aimed at boiler target flame, and target Fire Radiation light is gathered together;
The transparent surface of ultraviolet light transmission piece 12 vertically is positioned on the light path of described collector lens 11 collected light, make the collected light full illumination on the transparent surface of described ultraviolet light transmission piece 12, because ultraviolet light transmission piece 12 has the transmittance of very high UV transparent rate and very low other light, make the light of target Fire Radiation by after the ultraviolet light transmission piece 12, what keep mainly is the light of ultraviolet frequency spectrum, and the radius energy of other frequency spectrums is significantly reduced.
The light that process ultraviolet light transmission piece 12 filters enters the ultraviolet electric transducer 131 in the UV photodetector 13, the sensitive face of described ultraviolet electric transducer 131 is perpendicular to the light path of described lens and be positioned on the focus point of described collector lens 11, because the light of 13 pairs of ultraviolet frequency spectrums of ultraviolet electric transducer has higher responsiveness (promptly receive UV radiation light and can change out bigger electric current), and to the light responsiveness beyond the ultraviolet frequency spectrum very low (electric current of light conversion that promptly receives other frequency ranges is extremely weak), therefore, identical with the flicker frequency of target flame UV radiation light through the current signal frequency after 131 conversions of ultraviolet electric transducer, intensity is directly proportional with target flame UV radiation light intensity.
Described UV photodetector 13 comprises ultraviolet light photo sensor 131, the current-to-voltage converting circuit 132 that is connected with ultraviolet light photo sensor 131, the block isolating circuit 133 that is connected with current-to-voltage converting circuit 132, the voltage signal amplifying circuit 134 that is connected with block isolating circuit 133, the low-pass filter circuit 135 that is connected with voltage signal amplifying circuit 134, the output terminal of described low-pass filter circuit 135 is connected with analog to digital conversion circuit 21 in the flare up fire disposal system 2.
In the present embodiment, collector lens 11, ultraviolet light transmission piece 12 and UV photodetector 13 are installed in the airtight shell (among the figure for drawing), and collector lens 11 is installed on the shell.The ultraviolet light of boiler target Fire Radiation projects on ultraviolet light photo sensor 131 light-sensitive surfaces in the UV photodetector 13 by collector lens 11 and ultraviolet light transmission piece 12, is converted into faint current signal.Described UV photodetector 13 is welded on the circuit board (as shown in Figure 1), wherein ultraviolet light photo sensor 131 is welded on back of circuit board, current-to-voltage converting circuit 132, block isolating circuit 133, voltage signal amplifying circuit 134 and low-pass filter circuit 135 are arranged on the front of circuit board, by the processing of circuit target flame UV radiation electrical signal converted on the circuit board.
Fig. 3 is the electrical schematic diagram of the utility model ultraviolet flame detection system medium ultraviolet photodetector one embodiment.In the present embodiment, ultraviolet electric transducer 131 is photodiode U100.The current-to-voltage converting circuit 132 of the current signal that photodiode U100 changes out by being made of operational amplifier U101B, resistance R 100 and capacitor C 108 is converted to voltage signal with faint current signal, exports to block isolating circuit 133.Capacitor C 110 and resistance R 102 constitute block isolating circuit 133 among Fig. 2, DC component in the filtered signal, and export to voltage signal amplifying circuit 134.
In the present embodiment, voltage signal amplifying circuit 134 adopts the structure of 2 grades of in-phase amplification circuits, it comprises the 1st grade of in-phase amplification circuit that is made of operational amplifier U101A, resistance R 103, resistance R 104 and capacitor C 116, the 2nd grade of in-phase amplification circuit that is made of operational amplifier U102A, resistance R 105, resistance R 106, resistance R 107 and capacitor C 111.The AC signal of block isolating circuit 133 outputs is carried out the signal amplification through the 1st grade of in-phase amplification circuit and the 2nd grade of in-phase amplification circuit successively, exports to low-pass filter circuit 135.
In the present embodiment, low-pass filter circuit 135 adopts the structure of 2 grades of active low-pass filters, it comprises by operational amplifier U102B, resistance R 108, resistance R 109, resistance R 110, the 1st grade of active low-pass filter circuit that resistance R 111 capacitor C 112 and capacitor C 113 constitute, by operational amplifier U102C, resistance R 112, resistance R 113, resistance R 114 resistance R 115, the 2nd grade of active low-pass filter circuit that capacitor C 114 and capacitor C 115 constitute, according to the signal characteristic in the flame detection, the cut-off frequecy of passband of described the 1st grade of active low-pass filter circuit and the 2nd grade of active low-pass filter circuit is elected 200Hz as, 2 grades of active low-pass filters by low-pass filter circuit 135, can be with the high frequency interference filtering of introducing by cable connection in the signal, with-40 decibels of the decay of the high-frequency interferencing signal in the signal, filtered signal passes through by operational amplifier U102D, resistance R 116, resistance R 117, resistance R 119 and resistance R 120 formation homophase amplification output circuits are exported to the analog to digital conversion circuit 21 in the flare up fire disposal system 2.
Fig. 4 is the structural representation of flame signal processing system in the utility model ultraviolet flame detection system.As shown in Figure 4, described flare up fire disposal system 2 comprises analog to digital conversion circuit 21 and the digital signal processor 22 that is connected with analog to digital conversion circuit 21.Described digital signal processor 22 comprises the low-pass digital filter module 221 that is connected with analog to digital conversion circuit 21, the spectrum analysis module 222 that is connected with lowpass digital filter 221, the flame judge module 223 that is connected with spectrum analysis module 222.
Analog to digital conversion circuit 21 in the flare up fire disposal system 2 receives from the simulating signal of the flame UV radiation of ultraviolet flame detection probe 1 output, simulating signal is carried out digital sample, the output digital signal is given low-pass digital filter module 221, carry out low-pass filtering by 221 pairs of digital signals of low-pass digital filter module, characteristic according to flame flicking, high frequency interference part in the filtered signal, be transferred to spectrum analysis module 222 and carry out spectrum analysis, the flare up fire that the time domain that collects is distributed converts frequency-region signal to, obtaining the intensity (amplitude) of flare up fire on frequency domain distributes, and export to flame judge module 223 according to the signal amplitude of choosing on the corresponding frequencies with the flame flicking characteristic frequency that sets in advance, flame judge module 223 compares the amplitude that obtains respectively with the fray-out of flame amplitude and the flame combustion amplitude that are provided with, judge the target flame combustion or extinguish, and output status signal.
Fig. 5 is the electrical schematic diagram of flame signal processing system 2 one embodiment in the utility model ultraviolet flame detection system.As shown in Figure 5, the simulating signal that ultraviolet flame detection probe 1 collects is from the FLAME-IN end input of flare up fire disposal system 2, the block isolating circuit of being made up of capacitor C 200 and resistance R 200 carries out every straight processing input signal, DC component in the filtered signal, and export to 2 grades of in-phase amplification circuits of back grade.In Fig. 5, capacitor C 201 plays the high frequency interference effect in the filtered signal, and transient voltage killer tube D200 works the transient high voltages effect that stube cable may be introduced that suppresses.
The 2nd grade of in-phase amplification circuit through constituting through operational amplifier U200D, resistance R 201, resistance R 202, the 1st grade of in-phase amplification circuit that constitutes and operational amplifier U200C, resistance R 203, resistance R 204 and resistance R 205 every the signal of straight processing carries out signal and amplifies, and exports to 2 grades of active low-pass filter circuits.Capacitor C 202 plays the high frequency interference effect in the filtered signal.
The 1st grade of active low-pass filter circuit that constitutes by operational amplifier U200B, resistance R 206, resistance R 207, resistance R 208, resistance R 209, capacitor C 203, capacitor C 204, carry out low-pass filtering successively to the received signal with the 2nd grade of active low-pass filter circuit that constitutes by operational amplifier U200A, resistance R 210, resistance R 211, resistance R 212, resistance R 213, capacitor C 205 and capacitor C 206, export to analog to digital conversion circuit 21 through the signal of filtering.In the present embodiment, the cut-off frequecy of passband of active low-pass filter circuit is set at 200Hz.In Fig. 5, resistance R 214 is the filtering circuit output load, and capacitor C 207 and capacitor C 208 are the power filtering capacitor of operational amplifier U200A.
The simulating signal of the 21 pairs of inputs of analog to digital conversion circuit that are made of AD integrated chip U202, resistance R 217, resistance R 218, capacitor C 212, capacitor C 213, resistance R 219 and resistance R 220 is carried out digital sample, and the digital signal after the sampling is exported to the power filter effect that capacitor C 214, inductance L 200 capacitor C 215 and capacitor C 216 play AD integrated chip U202.
In the present embodiment, in the analog to digital conversion circuit 21 the analog signals scope that is converted of AD integrated chip input for-10V～+ 10V, conversion back output 16 position digital signals.Because the characteristic frequency of boiler flame flicker generally is lower than 200Hz, according to the sampling thheorem principle, the sample frequency fo of modulus sampling is set to 768Hz, AD integrated chip serial sampling 256 points, and the digital signal that 256 samplings are obtained is exported to digital filtering module and is handled.
The digital signal of analog to digital conversion circuit 21 outputs is carried out digital filtering by lowpass digital filter 221, and further the undesired signal that produces in the filtering circuit improves signal quality.In the present embodiment, in order not produce " aliasing " distortion, the cut-off frequecy of passband of lowpass digital filter 221 is chosen to be 200Hz.
Carry out spectrum analysis through lowpass digital filter 221 filtered signals by spectrum analysis module 222, the signal intensity (amplitude) that the digital sampled signal that time domain is distributed converts on the frequency domain distributes, and according to the flame flicking characteristic frequency that sets in advance select with the characteristic frequency same frequency on signal intensity (amplitude), the amplitude that obtains is exported to flame judge module 223 as the relative intensity value of target flame.
In the present embodiment, described lowpass digital filter 221, spectrum analysis module 222 and flame judge module 223 are that the dsp chip TMS320VC5402PGE that adopts TI company to produce realizes, this dsp chip is based on the advanced person's, through the Harvard structure of optimizing, 1 program storage bus and three data bus is independently separately arranged, its instruction cycle is 10ns, arithmetic capability is 100MIPS, 1 40 ALU is arranged, 2 40 totalizer, the multiplier of 1 17X17 position and 1 40 totalizer are arranged, can in the single cycle, finish 1 multiplication and 1 accumulating operation.These good operational performances have guaranteed that this dsp chip is as the control core of digital signal processor 22 in the utility model flame detector system, described lowpass digital filter 221, spectrum analysis module 222 and flame judge module 223 all place dsp chip with the form of digital signal processing module.
Need to prove, present embodiment only is applied to carry out in the flame detector system characteristics of signal Processing with regard to digital signal processor 22, employing form with digital signal processing module in dsp chip realizes lowpass digital filter 221, the function of spectrum analysis module 222 and flame judge module 223, above-mentioned embodiment only is the preferred embodiment that the utility model provides, in actual use, technical scheme according to the utility model announcement, can adopt other specialized equipments as lowpass digital filter 221 fully, spectrum analysis module 222 and flame judge module 223.For example, can adopt the portable fft analysis instrument of CF-3600 (or other similar fft analysis instrument) to carry out digital filtering and spectrum analysis, and judge the output that flame has or not by comparator circuit.
As shown in Figure 5, the signals such as D0-D15 signal, A0-A19 signal, PS, DS, IS, MSTRB, IOSTRB and R/W of dsp chip U1B wherein a part of pin of described dsp chip (U1B only drawn) are connected with storer 23, code translator 24 and I/O interface circuit 25 respectively according to the requirement of connecting circuit.Simultaneously, the D0-D15 signal links to each other with described AD integrated chip U202, and control AD integrated chip also reads the AD sampling value.
In the present embodiment, described storer 23 is the memory circuitries that are made of FLASH and SRAM.Described code translator 24 is the code translators that are made of FPGA.Described I/O interface circuit 25 is a man-machine interface, and application such as upper machine communication provide interface conversion.
Fig. 6 is the workflow diagram of flame signal processing system one embodiment in the utility model ultraviolet flame detection system.As shown in Figure 6, the workflow of flame signal processing system 2 is as follows in the present embodiment:
In the present embodiment, the means of interrupting by timing guarantee sample frequency, because the sample frequency fo of modulus sampling is set to 768Hz, so the timer corresponding setting is to interrupt once (1/768) second.
Entered once flow process as shown in Figure 4 behind the dsp operation in per 1/768 second: gating AD chip at first, read the AD conversion value.Deposit the AD conversion value that reads in storer then.
Every storage finishes an AD conversion value, need judge whether to have carried out 256 sub-samplings, if also do not finish 256 sub-samplings, then starts the AD conversion once more, prepares to enter after next 1/768 second again, withdraws from this secondary program then; If carried out 256 sub-samplings, then enter next step, begin 256 sampling values that obtained are carried out digital low-pass filtering and spectrum analysis.
In the present embodiment, described lowpass digital filter 221 adopts and places infinite-duration impulse response (IIR) digital filtering module of DSP is that 256 sampling values are carried out digital low-pass filtering, and the filter pass band cutoff frequency is 200Hz.
Above-mentioned 256 sampling values are carried out FFT (Fast Fourier Transform (FFT)) after by digital low-pass filtering and are calculated, and obtain the frequency spectrum X (k) of sampled signal, and wherein, k is the frequency number of times, and frequency spectrum X (k) is a plural form.In the present embodiment, owing to select sampling frequency fo=768Hz for use, so number of samples N=256 is frequency resolution F=3Hz.
According to the flame flicking characteristic frequency f that sets in advance in flame judge module 223
s, the spectrum value X (k of the characteristic frequency same frequency of from the frequency spectrum X (k) that obtains, selecting and setting
q), k wherein
q=f
s/ F calculates the amplitude of characteristic frequency point | X (kq) | and, as the relative flame intensity value output of tested target flame.In the present embodiment, described flame flicking characteristic frequency f
sCan import and revise from external man-machine interface by the I/O interface circuit 25 that is connected with dsp chip.
The amplitude of output | X (kq) | make comparisons with predefined fray-out of flame amplitude in the flame judge module 223, if | X (kq) | value is less than the fray-out of flame amplitude of setting, then putting tested target flame is the fray-out of flame state, otherwise use described again | X (kq) | make comparisons with predefined flame combustion amplitude in the flame judge module 223, if | X (kq) | value is greater than the flame combustion amplitude of setting, and then putting tested target flame is flame combustion state.In the present embodiment, described fray-out of flame amplitude can be imported and revise from external man-machine interface with the flame combustion amplitude by the I/O interface circuit 25 that is connected with dsp chip.
According to above-mentioned judgement flow process, if described | X (kq) | value during greater than the fray-out of flame amplitude of setting, less than the flame combustion amplitude set flame status keep last set constant, make the variation of flame status have hysteretic characteristic like this, effectively near some undesired signals of disturbance the filtering judgment threshold improve the accuracy that flame is judged.
Through after the above-mentioned comparison, prepare next 256 sub-samplings, withdraw from this program.
Claims (8)
1. ultraviolet flame detection system, it is characterized in that comprising the ultraviolet flame detection probe, the flare up fire disposal system that is connected with the ultraviolet flame detection probe, described flare up fire disposal system comprises the analog to digital conversion circuit that is connected with the ultraviolet flame detection probe, the digital signal processor that is connected with analog to digital conversion circuit.
2. ultraviolet flame detection system as claimed in claim 1 is characterized in that described flame-detecting probe comprises the collector lens that is set in turn on the same light path, ultraviolet light transmission piece and UV photodetector.
3. ultraviolet flame detection system as claimed in claim 2, it is characterized in that described UV photodetector comprises the ultraviolet light photo sensor, the current-to-voltage converting circuit that is connected with the ultraviolet light photo sensor, the block isolating circuit that is connected with current-to-voltage converting circuit, the voltage signal amplifying circuit that is connected with block isolating circuit, with the low-pass filter circuit that the voltage signal amplifying circuit is connected, the output terminal of described low-pass filter circuit is connected with analog to digital conversion circuit in the flare up fire disposal system.
4. ultraviolet flame detection system as claimed in claim 1 is characterized in that storer, code translator and I/O interface circuit that described flare up fire disposal system also comprises digital signal processor and is connected.
5. ultraviolet flame detection system as claimed in claim 1, it is characterized in that the digital signal processor in the described flare up fire disposal system comprises the low-pass digital filter module that is connected with analog to digital conversion circuit, the spectrum analysis module that is connected with lowpass digital filter, the flame judge module that is connected with spectrum analysis module.
6. ultraviolet flame detection system as claimed in claim 5 is characterized in that described lowpass digital filter adopts infinite-duration impulse response (IIR) digital filter.
7. ultraviolet flame detection system as claimed in claim 5 is characterized in that being provided with in the described spectrum analysis module flame flicking characteristic frequency value.
8. ultraviolet flame detection system as claimed in claim 5 is characterized in that being provided with in the described flame judge module fray-out of flame amplitude and flame combustion amplitude.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202149941U CN201600190U (en) | 2009-12-31 | 2009-12-31 | Ultraviolet flame detection system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202149941U CN201600190U (en) | 2009-12-31 | 2009-12-31 | Ultraviolet flame detection system |
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| CN201600190U true CN201600190U (en) | 2010-10-06 |
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| CN2009202149941U Expired - Fee Related CN201600190U (en) | 2009-12-31 | 2009-12-31 | Ultraviolet flame detection system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105427515A (en) * | 2015-12-29 | 2016-03-23 | 蚌埠市龙泰消防药剂有限公司 | GSM-based outdoor fire timing, positioning and remote short message alarm system |
| CN106225923A (en) * | 2016-09-05 | 2016-12-14 | 吕旭升 | A kind of ultraviolet dosage index measurement devices and methods therefor |
| CN107728190A (en) * | 2017-09-30 | 2018-02-23 | 天津大学 | It is a kind of based on the radiation intensity detector for referring to SiGe HBT more |
-
2009
- 2009-12-31 CN CN2009202149941U patent/CN201600190U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105427515A (en) * | 2015-12-29 | 2016-03-23 | 蚌埠市龙泰消防药剂有限公司 | GSM-based outdoor fire timing, positioning and remote short message alarm system |
| 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 |
| CN107728190A (en) * | 2017-09-30 | 2018-02-23 | 天津大学 | It is a kind of based on the radiation intensity detector for referring to SiGe HBT more |
| CN107728190B (en) * | 2017-09-30 | 2023-09-26 | 天津大学 | Radiation intensity detector based on multi-finger SiGe HBT |
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Granted publication date: 20101006 Termination date: 20181231 |
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