CN1653318A - Ultraviolet detector - Google Patents
Ultraviolet detector Download PDFInfo
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- CN1653318A CN1653318A CN 03810220 CN03810220A CN1653318A CN 1653318 A CN1653318 A CN 1653318A CN 03810220 CN03810220 CN 03810220 CN 03810220 A CN03810220 A CN 03810220A CN 1653318 A CN1653318 A CN 1653318A
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- 238000001514 detection method Methods 0.000 claims description 31
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- 239000003990 capacitor Substances 0.000 description 24
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- 229910052802 copper Inorganic materials 0.000 description 11
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- 239000007772 electrode material Substances 0.000 description 6
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- 229910052739 hydrogen Inorganic materials 0.000 description 3
- 238000000825 ultraviolet detection Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
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- 229910002091 carbon monoxide Inorganic materials 0.000 description 2
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
- G01J1/429—Photometry, e.g. photographic exposure meter using electric radiation detectors applied to measurement of ultraviolet light
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- Spectroscopy & Molecular Physics (AREA)
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
Abstract
A comparatively small-sized ultraviolet detectors free from mutual adverse effects between adjacent detectors when UV rays from flame are detected using a plurality of kinds of discharge-tube-type UV detectors having different detectable wavelength regions. A ultraviolet detector comprising an anode (11) and a cathode (12) set in a UV-ray transmittable discharge tube (10), and an ionizable gas filled in the discharge tube (10), wherein when a plurality of UV detectors (1, 2, 3) having cathodes (12) different in material are disposed on the incident side of UV rays and a specified voltage is applied to electrodes (11, 12) of each detector (1, 2, 3), voltage is applied to adjacent UV detectors time-shifted to avoid a concurrent voltage application.
Description
Technical field
The present invention relates to a kind of uv detection devices, be used for accurately and the ultraviolet ray that occurs as flame of test example effectively from combustion furnace inside.
Background technology
In combustion furnace, carry out temperature and control the supply of adjusting air or fuel, to reach and to keep temperature desired.On the other hand, require the harmful oxides of nitrogen (NO of inhibition
x) or the appearance of carbon monoxide (CO) etc., and improve burning efficiency.Like this, detect air-fuel ratio (mixture ratio of its indication air and fuel), and we think and control burning based on it.Device as that purpose, the image measurement checkout equipment that air-fuel ratio distributes in a kind of flame has been proposed, it comprises camera that is used to receive the visible light that occurs from flame and the image processing device that is used for calculating according to the image that obtains thus air-fuel ratio.
On the other hand, in order to satisfy above-mentioned requirements, highly increased employed furnace wall temperature (600 ℃-900 ℃).Under such high temperature, because visible light is except also launching from the furnace wall from the flame of furnace interior, so in aforesaid measurement checkout equipment based on visible light, can not measure air-fuel ratio exactly.Like this, detect the more ultraviolet ray of short wavelength range (being shorter than 400nm) of visible light of sending, and can expect measuring air-fuel ratio based on it than from flame.Therefore, detect ultraviolet device, be known that discharge-tube type, photoelectricity cast or Geiger-Miller type (hereinafter referred to as " discharge-tube type ") UV-detector and semi-conductor type UV-detector as being used to.Yet, because a little less than the ultraviolet ray relatively that the flame above for example occurs, thus be difficult to detect ultraviolet ray by the semi-conductor type detecting device of muting sensitivity, and be necessary to use highly sensitive discharge-tube type UV-detector.
Traditional discharge-tube type UV-detector is by ionizable gas being filled into discharge tube inside and pair of electrodes is installed in the discharge tube that ultraviolet ray can see through and constitutes.As penning gas, use the mixed gas of neon-hydrogen, helium-hydrogen or neon-argon-hydrogen.And, when between pair of electrodes, applying about 300V voltage, become and can detect ultraviolet state (ON state).And when negative electrode was hit in ultraviolet ray, it became discharge condition.
In the ultraviolet spectral distribution that detects thus, show wave mode corresponding to each composition of the NO in the flame, OH, CH etc. from flame.Yet whether the wavelength coverage that shows those wave modes is the detectable material that depends on the electrode of discharge tube inside.That is to say, the electrode material that is used for this discharge tube is tungsten (W), nickel (Ni), molybdenum (Mo), copper (Cu), iron (Fe), gold (Au), silver (Ag), tantalum (Ta), carbon (C) etc., but whether detectable wavelength coverage is made by any materials by negative electrode and decided.
The materials limitations of the UV-detector of this discharge-tube type by electrode detectable ultraviolet ray range, but it is used as the flame of monitoring combustion furnace inside so that can detect the device of ultraviolet existence.
Yet, for satisfied latest requirement, accurately compositions such as NO, the OH in the flame detection, CH to combustion furnace.And, if traditional discharge-tube type UV-detector is used as the ultraviolet device that detects from flame emission, following point then appears.
At first, comprise those compositions in order to detect the wavelength coverage of each composition such as the NO, the OH that show in the flame, CH, to be necessary for, promptly a plurality of kinds, each wavelength coverage and prepare can detect by the electrode material decision as mentioned above the detecting device of ultraviolet range.Can detect the different a plurality of discharge-tube type UV-detector of wavelength coverage for those, need be in the tight arrangement of setting up (established) position, make with of the ultraviolet ray of identical state-detection, and closely arrangement needs those arrangement pitches from the flame emission of stove inside.
In addition, when a detecting device produces discharge by ultraviolet incident, identical from this detecting device self appearance so if closely arrange described a plurality of discharge-tube type UV-detector with ultraviolet ray, owing to electromagnetic field appears in discharge.Because by those electromagnetic fields and the ultraviolet ray and adjacent detecting device may be subjected to bad influence, so about the ultraviolet correct detection from flame become the difficulty.
Causing bad influence because prevent mutually as between the above mentioned adjacent detector, so can expect, handle to prevent that visible light and ultraviolet reflection are to the wall surface of discharge tube, perhaps strengthen electromagnetic screen, only make and to incide each detecting device from the ultraviolet ray of the flame of stove inside.Yet if by such processing and shielding and eliminate bad influence fully between adjacent detector, the flame detection part integral body of stove inside must maximize so.
Summary of the invention
The purpose of this invention is to provide a kind of uv detection devices, it can form quite little size, and when multiple when detecting the different discharge-tube type UV-detector of wavelength coverage and detecting from flame ultraviolet by using, it does not cause bad influence to the detection between the adjacent detector.
The first embodiment of the present invention comprises a plurality of UV-detector, and each detecting device is at ultraviolet transmissive and be full of in the discharge tube of ionizable gas and have anode and negative electrode, and the material of negative electrode differs from one another, and is arranged in ultraviolet light incident side; Wherein, predetermined voltage is applied in the different time on the electrode of each UV-detector, makes and voltage is provided for simultaneously adjacent UV-detector.
In the uv detection devices of this embodiment, preferably, voltage is applied in turn on the electrode of described a plurality of UV-detector.
Another embodiment of the present invention comprises: discharge tube, and ultraviolet ray can transmission be crossed this discharge tube, and ionizable gas is filled in this discharge tube; Electrode spread has a plurality of negative electrodes that are arranged in the anode in the discharge tube and are arranged in the anode opposite, are made up of different materials; And voltage provides circuit, is used for predetermined voltage is applied to this electrode spread, and wherein this voltage provides circuit not to be simultaneously but voltage is applied on the adjacent at least negative electrode at different time.
In the uv detection devices of this embodiment, wishing to change in response to electrode material from voltage provides the voltage application time that circuit offers each electrode unit and applies size.Therefore, can revise the sensitivity difference that the difference by electrode material causes.
According to first embodiment, the described a plurality of UV-detector that differ from one another for cathode material apply predetermined voltage by staggered (staggering) time, make not apply this predetermined voltage simultaneously in adjacent UV-detector.Therefore, because in when discharge, do not cause bad influence between adjacent detector, and electromagnetic screen and other other structure be unnecessary, so wholely can comprise quite little size.
According to another embodiment, in a discharge tube, electrod assembly is formed by an anode (public) with by the negative electrode that multiple different materials constitutes.That is to say, because unified multiple detecting device, and covered a plurality of ultraviolet detection scopes, so integral body can form forr a short time with a discharge tube.And, because it is simple device, so carrying (handling) is convenient.
According to the present invention,, and can judge that flame status is normally still unusual even above-mentioned any embodiment is also calculated air-fuel ratio by detecting from the ultraviolet ray of combustion flame emission.Therefore, provide this uv detection devices, it is suitable for various uses, and the condition diagnosing of the combustion furnace of for example be used for quenching (hardening) or the fire of various facilities detect.
In addition, when any one of described a plurality of detecting devices (specifically, negative electrode and discharge tube) damaged, can temporarily replace and can augment it, make temporarily to keep burning at limited time durations with other detecting device.
Description of drawings
Fig. 1 shows the uv detection devices of the first embodiment of the present invention.
Fig. 2 shows by detecting the example of ultraviolet driving circuit on three UV-detector among the embodiment that predetermined voltage is applied to Fig. 1.
3 UV-detector that Fig. 3 shows by the Fig. 1 that becomes the ON state successively detect ultraviolet operation.
Fig. 4 shows the emission spectrum such as the wavelength coverage of compositions such as NO, OH, CH in the flame of expression detected object.
Fig. 5 shows expression because the figure of the mutual relationship of the emissive porwer of the composition occur of burning and air ratio.
Fig. 6 shows in 3 UV-detector shown in Figure 1, arranges the structure of the situation of low-pass filter before the input light parts of the detecting device that negative electrode is made by Cu and Ag.
Fig. 7 shows the variation by the ultraviolet wavelength coverage of the detecting device detection of the low-pass filter of having arranged Fig. 6.
Fig. 8 shows the uv detection devices of the second embodiment of the present invention.
Fig. 9 shows expression and uses the flame of the uv detection devices of this embodiment to detect the process flow diagram of processing procedure.
Embodiment
Fig. 1 shows the structure of the uv detection devices of first embodiment of the invention.This checkout equipment constitutes like this: arrange a plurality of discharge-tube type UV- detector 1,2 and 3 (for illustrated situation, number is 3) towards ultraviolet light incident side.
Each UV- detector 1,2 and 3 common structure are arranged in pair of electrodes (anode 11 and negative electrode 12) in the discharge tube of being made by ultraviolet transmission glass 10 abreast with predetermined space, and ionizable gas (penning gas) is filled in the discharge tube 10.Yet the negative electrode 12 of each detecting device is made by the material that differs from one another (diagram: W, Cu and Ag).
In addition, anode 11 is made by net metal material (for example, Mo, Ni or W).Netted by anode 11 is made, ultraviolet ray enters inside and hits negative electrode 12 from the upper end of discharge tube 10.For such UV-detector as mentioned above, if under the state that has applied about 300V voltage between the pair of electrodes (ON state), negative electrode hits ultraviolet ray, and it becomes discharge condition so.Thereby, can measure ultraviolet ray by detecting institute's electric current present.
In each UV- detector 1,2 and 3 of Fig. 1, pair of electrodes, i.e. anode 11 and negative electrode 12 are according to the relation adjacent with the upper parallel of discharge tube 10 the insides, supported by the metal bar support component 13 and 14 that is connected those electrodes.
For example, the driving circuit shown in Fig. 2 drives each UV- detector 1,2 and 3.For this driving circuit, in being included in, each UV- detector 1,2 and 3 with negative electrode 12 of being made by different materials as mentioned above also is driven into the ON state in turn.By receive ultraviolet ray in the ON state, each detecting device becomes discharge condition, and produces from anode 11 to negative electrode 12 pulse current.
Circuit for Fig. 2, above-mentioned UV- detector 1,2 and 3 is in line at capacitor 21 and diode 22 places, the primary side of capacitor 21 and diode 22 and transformer 20 and comprise that the outgoing side with resistor 23 and potential circuit of the parallel circuit of capacitor 24 is connected.And it comprises by the on-off circuit 25 that is arranged in each negative electrode 12 side and connects the parallel circuit with resistor 23 and capacitor 24.
On-off circuit 25 is with the order of UV- detector 1,2 and 3, according to preset time (for example, a lot of microseconds-a lot of milliseconds) and periodically (utilize and exchange (interchange) or rectangle wave mode) voltage that applies predetermined voltage or change with situation (for example, when from the ultraviolet ray amount of flame when a lot, this voltage reduces).Therefore, for example, preferably have the level and smooth mechanical switching device shifter of slider 28, wherein at interval this switching device shifter is switched in turn the terminal of the cathode side that is connected to each UV- detector 1,2 and 3 with preset time.
When the end terminals of second winding of the transformer in the circuit of Fig. 2 20 be+time, electric current flows by resistor 23 and diode 22 from these end terminals, makes capacitor 21 be charged as illustrated polarity.In second cycle that exchanges, the second side voltage of transformer 20 is added on the voltage of capacitor 21, and principal voltage is applied on the anode 11 of the UV-detector that is connected with the slider 28 of on-off circuit 25.
For illustrated example, it is 136V that second voltage is set, and capacitor 21 is 4 μ F, and resistor 23 is 5100 Ω, and capacitor 24 is 10 μ F, and the voltage of capacitor 21 is 11V.
In the state that alternating voltage is applied on the transformer 20,, then connect the detecting device 1,2 of slider 28 of on-off circuit 25 or 3 impedance and become high if ultraviolet ray exists.At first, electric current flows by diode 22, and capacitor 21 charges in the half period of beginning.In second cycle, electric current this circuit of almost or not flowing through.When voltage is reverse once more, have only leakage current only to flow to diode 22, capacitor 21 remains on charged state.This leakage current is not enough to produce output current.
When ultraviolet ray existed, above-mentioned detecting device conducted electricity during the half period of the interchange that is added to transformer 20.Capacitor 21 is by the parallel circuit discharge of detecting device and resistance 26 and capacitor 27.When second cycle of the reversal of poles that is added to transformer 20 occurred, capacitor 21 charged once more by diode 22.
If detecting device keeps conduction state, then capacitor 21 alternately charges and discharges.Therefore, in every half period at an interval, the electric current through diode 22 appears.Therefore, pressure drop occurring in the resistor 23 of diode series connection therewith continuously, this pressure drop gives capacitor 24 chargings, and this voltage appears at two ends.During this period, the voltage at capacitor 27 two ends is minimum.If detecting device is short-circuited, because impedance becomes minimum, thus capacitor 21 processes and its diode connected in parallel 29, and be charged to quite high voltage.That is to say that by applying reverse biased just for diode 22 in every half period at an interval, the high charging voltage of capacitor 21 worsens conductivity degree.Therefore, because the electrorheological of inflow resistor 23 gets very little or is zero,, perhaps there is not electric charge so the quantity of electric charge of capacitor 24 becomes lowly.If capacitor 24 becomes no state of charge, the then voltage vanishing at two ends.
Up to having finished ultraviolet incident, detecting device just becomes the off state in half period, and capacitor 21 is recharged.In second cycle, this detecting device becomes the on state, and discharges electric charge from capacitor 21.
In addition, the parallel circuit of resistor 26 and capacitor 27 and diode 29 comprise short-circuit protection.
In the on-off circuit 25 of Fig. 2, for example, negative electrode 12 is applied to predetermined voltage on the pair of electrodes of each discharge tube inside with regular time according to UV-detector of being made by W, Cu and Ag 1,2 and 3 order.Therefore, each UV- detector 1,2 and 3 becomes ON state (operation) in turn, and as shown in Figure 3, and each can detect the ultraviolet ray that can detect wavelength coverage.Specifically, under the state of the pair of terminals that the alternating voltage shown in Fig. 3 is being applied to the anode that is connected to each UV- detector 1,2 and 3 and negative electrode, when negative electrode receives ultraviolet ray, almost discharge in the semiperiod in each of alternating voltage.By this discharge, obtain such as for example illustrated marking current.So, be shown in dotted line terminal voltage.
In addition, between the UV-detector as Fig. 3, the voltage application time (ON state) that offers the different a plurality of UV-detector of cathode material does not overlap each other.And, after the ON of a detecting device, preferably, after detecting device becomes non-ON (OFF) state arbitrarily, make another detecting device become the ON state.
Fig. 4 shows the emission spectrum of the wavelength coverage (wavelength characteristic) of compositions such as NO, the OH of expression in the flame, CH, and this flame is detected object of the present invention.This is the acetylene-nitrous oxide (N on the burner
2O) example of flame.Illustrated strongly, each is that composition in the wavelength coverage that is less than or equal to about 260 (nm) is NO, approximately the wavelength coverage of 260-310 (nm) is OH, and approximately the wavelength coverage of 310-400 (nm) is CH and CN.
On the other hand, in response to the kind of the electrode (material) of discharge-tube type detecting device as mentioned above and work function (Φ) and wavelength are classified as follows.
Φ1＝4.52eV(W)，4.6-5.24eV(Ni)，4.2eV(Mo)
Wavelength=270,270-236,294 (nm)
Φ2＝3.85-4.38eV(Cu)，4.04-4.77eV(Fe)，4.0-4.58eV(Au)，4.07-4.19eV(Ta)，4.39eV(C)
Wavelength=320-280,306-260,309-270,303-295,281 (nm)
Φ3＝3.08-3.56eV(Ag)，2.98-4.43eV(Al)，2.24eV(Ca)
Wavelength=400-347,414-279,551 (nm)
Therefore, in the emission spectrum of Fig. 4,
For the NO in the flame, because it is detected in the wavelength coverage of 200-250nm, so be output as F1=f1 (Φ 1) in the electrode of work function Φ 1.
For the OH in the flame, because it is detected in the wavelength coverage of 260-310nm, so be output as F2=f2 (Φ 2)-k1/F1 in the electrode of work function Φ 2.[k1 is a correction factor].
For the CH in the flame, because it is detected in the wavelength coverage of 314-390nm, so be output as F3=f3 (Φ 3)-k2/F2-k3/F1 in the electrode of work function Φ 3.[k2 and k3 are correction factors].
According to top narration, the work function Φ 1 that satisfies electrode material mainly catches (ground) at the bottom of (catches) NO, and work function Φ 2 catches OH and NO, and work function Φ 3 catches NO, OH, CH, CN, C etc.
Therefore, as above-mentioned embodiment, by (for example utilizing each negative electrode by different materials, W, Cu and Ag) a plurality of UV-detector made detect ultraviolet ray, be met the emission spectrum of the wavelength coverage of those materials, and can calculate the amount (those strength ratios) of composition such as NO, CH in the flame.
On the other hand, the emissive porwer of burning and air ratio have fixing relation, as shown in Figure 5.For example, this illustrates the CH that occurs when providing air and utilize rock gas to act as a fuel combustion air
4, spectral intensity in the Air mixing gas at the bottom of NO, OH and the CH (ratio) and equivalent (equivalence) are than the relation of (inverse of air ratio).Air ratio is essential air (that is, the oxygen) amount (this is considered as 1) of bottom line that makes fuel perfect combustion, and this is essential in theory air capacity.Yet in fact, air may fully not mix with fuel.In addition, as described above, supply air slightly too much, so that burn with higher temperature.That is to say, the desired value of air ratio is set at is higher than 1 far away.And, be necessary to detect real air ratio, with the supply of control air or fuel, make that air ratio reaches desired value when burning.
Therefore, because by uv detection devices of the present invention, NO in the flame and the emissive porwer ratio of CH of calculating as mentioned above is so provide air ratio based on the above-mentioned relation from result of calculation.
Other embodiment of explained later.
In the checkout equipment of forming by a plurality of UV-detector shown in Fig. 1, Fig. 6 shows such negative electrode 12: the output light parts (upper end face of each discharge tube 10 of Fig. 1) in the UV-detector of being made by Cu and Ag 2 and 3 have been arranged low-pass filter or bandpass filter 15 (in the situation of following use " low-pass filter " it being made an explanation) before, pass through only to allow long ultraviolet ray from predetermined wavelength.
According to this structure as shown in Figure 7, the wavelength coverage that detects in the UV- detector 2 and 3 has been cut away the part less than each predetermined wavelength (for example, in the situation of Cu, it is 250nm, and in the situation of Ag, it is 280nm).Thus, the ultraviolet range of the long side of UV-detector 1 radiothermy of only being made by W detects negative electrode 12.And in the wavelength coverage bigger than it, the detection in the ultraviolet range of dividing in response to the characteristic of each detecting device becomes possible, makes to have arranged that the UV- detector 2 and 3 of bandpass filter or low-pass filter 15 detects.On the other hand, because as mentioned above and show the spectrum of compositions such as NO, OH, CH in each scope of dividing, so must use detecting device to detect those compositions corresponding to each scope.That is to say, utilize such spectrum, such effect is provided: the detection or the analysis precision of uv detection devices improve.
Fig. 8 shows the uv detection devices of second embodiment of the invention.This checkout equipment and first embodiment are common at this point place: ionizable gas (penning gas) is filled in the discharge tube of being made by ultraviolet transmission glass 30.Yet, below this point different with first embodiment: by comprising that multiple different materials is (in this case, 3 kinds) negative electrode 32 be arranged in anode 31 opposites that comprise the net metal material that are installed in discharge tube 30 inside, form a discharge-tube type detecting device.
For example, three negative electrodes 32 are made by W, Cu and Ag, the voltage that utilization is made up of the driving circuit of Fig. 2 provides circuit (diagram is omitted), between the common anode 31 that comprises electrod assembly and each negative electrode 32, voltage is applied on the adjacent negative electrode 32 with the staggered time.
In addition, the purpose identical with Fig. 6 be, in the upper end face of discharge tube 30, in the position corresponding to the negative electrode of being made by Cu and Ag 32 of inside, arranges the low-pass filter 15 that only allows long ultraviolet ray to pass through from each predetermined wavelength.
The uv detection devices of the foregoing description is not limited to the flame of combustion furnace inside, and it can be preferably used for using the state-detection or the flame of igniting flare in the abnormality detection, motor car engine of the kitchen of fire and the flare in the cookhouse to detect, and is used for fire preventing.
For example, about fire prevention, for the workshop of using infrared heating heating furnace or using it to weld, because quite a large amount of light occurs from stove and pad, the detection so conventional photodetector makes a mistake.Yet, according to above-mentioned uv detection devices, because detect ultraviolet ray rather than those light that occur from the flare that can develop into fire, so can find to cause the flame detonation of fire early.
Fig. 9 shows in fire prevention, the process flow diagram of the flame detecting method example of the situation of the uv detection devices of use the foregoing description.Come the processing signals electric current to carry out the method by the processing apparatus that utilizes other computing machine, among above-mentioned first embodiment or second embodiment, this marking current produces by caused three kinds of negative electrodes (being made by W, Cu and Ag) discharge by ultraviolet incident.
Specifically, in Fig. 9, at first, the detecting device based on whether by any one negative electrode made with W, Cu and Ag detects ultraviolet ray, and judges whether it is flame.That is to say, in ST1, check that the negative electrode of whether being made by W detects it.And if "Yes", then measuring-signal amount (ultraviolet ray amount) (ST2).In next ST3, check that the negative electrode of whether being made by Cu detects it.And if "Yes", then measuring-signal amount (ultraviolet ray amount) (ST4).In next ST5, check that the negative electrode of whether being made by Ag detects it.And if "Yes", then measuring-signal amount (ultraviolet ray amount) (ST6).In above-mentioned situation,, judge that also it is flame (ST7) even because any detecting device detects ultraviolet ray.And,, carry out computing above mentioned to calculate " air ratio " (ST8) based on the semaphore that in each detecting device, is detecting and measuring.Judge that the air ratio obtain is whether in the value of setting (ST9).If "Yes" judges that then it is suitable flame and returns first waiting status.On the other hand, when the air ratio that obtains the value of setting in not, judge that it is unusually, and warn sound (ST10).In addition, if in above-mentioned detecting device, all do not detect ultraviolet ray, judge that then it is not flame (ST11), and return first waiting status.
In above-mentioned flame is judged, when it being detected (above-mentioned ST1, ST3 and ST5 be judged as "Yes") by each detecting device, although perhaps working as the ultraviolet detection signal is not 0, but during its very little (it is lower than the threshold value that is judged as detection), promptly, when detection is insufficient or intermittent, can judge temporarily that it is " flame ".Specifically, shown in the dashed rectangle among Fig. 9, although the amount of measured signal checks less than the predetermined value that is judged as " flame " (upper threshold value) whether it is the rank (whether it is bigger than lower threshold value) that detecting device can temporarily use in each of above-mentioned ST2, ST4 and ST6.If this rank between upper threshold value and lower threshold value, judges then that it is " using ability " temporarily.And, if it is less than lower threshold value, then judge its be " not being flame " (ST11).At this moment, even some ultraviolet detection abilities are the detecting devices of degenerating, it also can be arranged to available, till arriving the predetermined time limit.
Although the embodiment that explained as mentioned above, but because using, sensing range passes through electrode material and different discharge-tube type detecting devices, so the present invention can adopt any configuration and be not limited thereto.
For example, can be by being that many groups of one group of 3 kinds of discharge tube are prepared and improved reliability.
When using device of the present invention in the combustion furnace at other turbine, it can (example: the outlier Ag electrode) detects the combustion apparatus wall surface temperature that becomes non-normal temperature or becomes the periodically generation of the phenomenon of non-normal temperature, and wherein said discharge tube detects long wavelength's ultraviolet ray by detecting discharge tube.In detail, if the air ratio of combustion flame is normal, then the output from a plurality of discharge tubes (electrode example: W, Cu and Ag) is predetermined value, but such situation is arranged: by high temperature fluctuation flame, furnace walls becomes non-normal temperature.For example, when the turbo blade of the gas turbine that rotates in the outlet of furnace walls place or combustion furnace is degenerated and become non-normal temperature easily, have only the discharge tube of Ag electrode to detect non-normal temperature, and periodically fluctuation of output.In contrast to this, when many groups discharge tube, because (example: whole purposes Ag) are not identical output to identical electrodes, but the different phenomenon of output valve occurs by the difference (ratio that non-normal temperature comes into view) of turning, the visual field (comer), so can detect non-normal temperature.
In addition, even it is to exchange, the voltage that is applied on the electrode also is preferably direct current and square wave.
Claims (3)
1. uv detection devices comprises: a plurality of UV-detector, and each is at ultraviolet transmissive and be full of in the discharge tube of ionizable gas and have anode and negative electrode, and the material of negative electrode differs from one another, and is arranged in ultraviolet light incident side; Wherein, predetermined voltage is applied on the electrode of each UV-detector, makes simultaneously voltage not to be offered adjacent UV-detector in the different time.
2. according to the uv detection devices of claim 1, wherein, voltage is applied on the electrode of described a plurality of UV-detector in turn.
3. uv detection devices comprises: discharge tube, and ultraviolet ray can transmission be crossed this discharge tube, and ionizable gas is filled in this discharge tube; Electrode spread, a plurality of negative electrodes of forming by different materials that it has the anode that is arranged in the discharge tube and is arranged in this anode opposite; And voltage provides circuit, is used for predetermined voltage is applied to this electrode spread, and wherein, this voltage provides circuit not to be simultaneously but voltage is applied on the adjacent at least negative electrode at different time.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP131691/2002 | 2002-05-07 | ||
| JP2002131691A JP4521153B2 (en) | 2002-05-07 | 2002-05-07 | UV detector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1653318A true CN1653318A (en) | 2005-08-10 |
| CN100414271C CN100414271C (en) | 2008-08-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB03810220XA Expired - Fee Related CN100414271C (en) | 2002-05-07 | 2003-05-06 | Ultraviolet detector |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP4521153B2 (en) |
| CN (1) | CN100414271C (en) |
| AU (1) | AU2003235842A1 (en) |
| WO (1) | WO2003095958A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104823041A (en) * | 2013-09-25 | 2015-08-05 | 韩国生产技术研究院 | Air-fuel ratio measurement system comprising optical sensor |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010122102A (en) * | 2008-11-20 | 2010-06-03 | East Japan Railway Co | Ultraviolet ray detection device and pantograph bounce detection recorder |
| PL2439451T3 (en) * | 2010-10-08 | 2014-06-30 | Bfi Automation Mindermann Gmbh | Device for recognising the presence of a flame |
| JP2013029453A (en) * | 2011-07-29 | 2013-02-07 | Azbil Corp | Flame sensor |
| JP5832948B2 (en) * | 2012-03-30 | 2015-12-16 | アズビル株式会社 | Flame detection device |
| JP6815291B2 (en) * | 2017-07-14 | 2021-01-20 | アズビル株式会社 | Cathode electrode selection support method and equipment |
| JP7139198B2 (en) * | 2018-08-30 | 2022-09-20 | アズビル株式会社 | UV sensor |
| KR102195375B1 (en) * | 2019-03-28 | 2020-12-24 | 한국표준과학연구원 | The fire detection sensor capable of simultaneous measurement of ultraviolet and infrared rays |
| JP6948679B1 (en) * | 2020-11-16 | 2021-10-13 | 東京瓦斯株式会社 | Air ratio estimation system, air ratio estimation method and program |
| JP6948678B1 (en) * | 2020-11-16 | 2021-10-13 | 東京瓦斯株式会社 | Air ratio adjustment method, air ratio adjustment system and program |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5222934Y2 (en) * | 1972-04-03 | 1977-05-25 | ||
| US5487266A (en) * | 1992-05-05 | 1996-01-30 | General Electric Company | Combustion control for producing low NOx emissions through use of flame spectroscopy |
| JP2651352B2 (en) * | 1993-06-02 | 1997-09-10 | 浜松ホトニクス株式会社 | Photocathode, phototube and photodetector |
| JPH0750249A (en) * | 1993-08-06 | 1995-02-21 | Toshiba Corp | Electron beam lithography device |
| EP0809792B1 (en) * | 1995-02-14 | 2002-06-12 | GTA Sensorik GmbH | Device for determining the strength and dose of ultraviolet radiation using sensors sensitive to ultraviolet radiation |
| JP2001196023A (en) * | 2000-01-06 | 2001-07-19 | Hamamatsu Photonics Kk | Photomultiplier |
| JP2001329862A (en) * | 2000-05-19 | 2001-11-30 | Mitsubishi Heavy Ind Ltd | Flame detecting device for gas turbine |
| JP2001343280A (en) * | 2000-06-02 | 2001-12-14 | Yamatake Corp | Flame detecting device |
| JP4399963B2 (en) * | 2000-07-14 | 2010-01-20 | 三菱電機株式会社 | Ionization chamber detector |
-
2002
- 2002-05-07 JP JP2002131691A patent/JP4521153B2/en not_active Expired - Lifetime
-
2003
- 2003-05-06 CN CNB03810220XA patent/CN100414271C/en not_active Expired - Fee Related
- 2003-05-06 AU AU2003235842A patent/AU2003235842A1/en not_active Abandoned
- 2003-05-06 WO PCT/JP2003/005653 patent/WO2003095958A1/en active Application Filing
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104823041A (en) * | 2013-09-25 | 2015-08-05 | 韩国生产技术研究院 | Air-fuel ratio measurement system comprising optical sensor |
| CN108425748A (en) * | 2013-09-25 | 2018-08-21 | 韩国生产技术研究院 | Air-fuel ratio measuring system including optical sensor |
Also Published As
| Publication number | Publication date |
|---|---|
| AU2003235842A1 (en) | 2003-11-11 |
| JP2003322562A (en) | 2003-11-14 |
| JP4521153B2 (en) | 2010-08-11 |
| CN100414271C (en) | 2008-08-27 |
| WO2003095958A1 (en) | 2003-11-20 |
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