WO2003095958A1 - Detecteur d'ultraviolets - Google Patents
Detecteur d'ultraviolets Download PDFInfo
- Publication number
- WO2003095958A1 WO2003095958A1 PCT/JP2003/005653 JP0305653W WO03095958A1 WO 2003095958 A1 WO2003095958 A1 WO 2003095958A1 JP 0305653 W JP0305653 W JP 0305653W WO 03095958 A1 WO03095958 A1 WO 03095958A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- ultraviolet
- detectors
- voltage
- detector
- discharge tube
- Prior art date
Links
- 239000000463 material Substances 0.000 claims abstract description 15
- 238000000825 ultraviolet detection Methods 0.000 claims description 7
- 239000010406 cathode material Substances 0.000 claims description 3
- 230000002411 adverse Effects 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 4
- 239000003990 capacitor Substances 0.000 description 23
- 238000001514 detection method Methods 0.000 description 19
- 238000002485 combustion reaction Methods 0.000 description 18
- 239000010949 copper Substances 0.000 description 13
- 239000000446 fuel Substances 0.000 description 13
- 239000007789 gas Substances 0.000 description 12
- 229910052802 copper Inorganic materials 0.000 description 9
- 229910052709 silver Inorganic materials 0.000 description 9
- 229910052721 tungsten Inorganic materials 0.000 description 8
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 238000001228 spectrum Methods 0.000 description 4
- 230000002159 abnormal effect Effects 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 239000007772 electrode material Substances 0.000 description 3
- 238000000295 emission spectrum Methods 0.000 description 3
- 239000010931 gold Substances 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- GQPLMRYTRLFLPF-UHFFFAOYSA-N Nitrous Oxide Chemical compound [O-][N+]#N GQPLMRYTRLFLPF-UHFFFAOYSA-N 0.000 description 2
- 238000010411 cooking Methods 0.000 description 2
- 238000012937 correction Methods 0.000 description 2
- 230000005672 electromagnetic field Effects 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910052750 molybdenum Inorganic materials 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- YZCKVEUIGOORGS-UHFFFAOYSA-N Hydrogen atom Chemical class [H] YZCKVEUIGOORGS-UHFFFAOYSA-N 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- -1 Neon monohydrogen Chemical class 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 229910052754 neon Inorganic materials 0.000 description 1
- 239000001272 nitrous oxide Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 238000004611 spectroscopical analysis Methods 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- 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
Definitions
- the present invention relates to an ultraviolet ray detection device for accurately and efficiently detecting ultraviolet rays generated from a flame in a combustion furnace, for example.
- the furnace wall temperature has been increasing (600 ° C to 900 ° C), and it has been increasingly used.
- visible light is radiated not only from the flame in the furnace but also from the furnace wall, so that the measurement and detection device based on visible light cannot measure the air-fuel ratio correctly as described above. Therefore, it is conceivable to detect ultraviolet rays in the region where the wavelength is shorter than visible light (shorter than 400 nm) emitted from the flame, and measure the air-fuel ratio based on that.
- discharge tube type a photoelectric tube type or a Geiger-Muller type ultraviolet detector
- semiconductor type ultraviolet detector a semiconductor ultraviolet detector
- the ultraviolet light emitted from the flame as described above is relatively weak, a semiconductor ultraviolet detector with low sensitivity cannot be used, and a high-sensitivity discharge tube ultraviolet detector must be used.
- Conventional discharge tube type ultraviolet detectors are constructed by placing a pair of electrodes (anode and cathode) in a discharge tube through which ultraviolet light can pass, and filling the discharge tube with an ionizable gas (penning gas). ing. Neon monohydrogen, helium as the penning gas A mixed gas of monohydrogen or neon-argon-hydrogen is used. Then, when a voltage of about 300 volts is applied between the small electrodes, ultraviolet rays can be detected (on state), and when ultraviolet rays hit the cathode, they are discharged.
- penning gas ionizable gas
- the materials of the electrodes used in this type of discharge tube are tungsten (W), nickel (Ni), molybdenum (Mo), copper (Cu), iron (Fe), gold (Au), Silver (Ag), tantalum (T a), carbon (C), etc.
- the detectable wavelength range is determined by the material of the cathode (force sword).
- Such discharge tube type ultraviolet detectors have a limited range of detectable ultraviolet rays depending on the material of their electrodes, but can detect the presence or absence of ultraviolet rays, so that means for monitoring the flame in the combustion furnace is used. It is used as
- a detector whose detectable ultraviolet region is determined by the electrode material as described above Must be prepared for each wavelength region including those components.
- a plurality of discharge tube type ultraviolet detectors having different detectable wavelength ranges be arranged in close proximity to a predetermined place so that ultraviolet light emitted from the flame in the furnace can be detected under the same conditions. And requires space for their placement.
- adjacent detectors may have an adverse effect upon detection. It is an object of the present invention to provide an ultraviolet detector that can be configured to be relatively small without any.
- a first aspect of the present invention is an ultraviolet detector configured by placing an anode and a cathode in a discharge tube through which ultraviolet light can pass, and filling the discharge tube with an ionizable gas. Are placed on the UV light incident side, and when a predetermined voltage is supplied to the electrodes of each UV detector, the time is shifted so that adjacent UV detectors are not supplied simultaneously. It is characterized by applying the voltage.
- the ultraviolet detector of this aspect it is preferable to apply voltages to the electrodes of the plurality of ultraviolet detectors in order.
- Another embodiment of the present invention is directed to a discharge tube through which ultraviolet light can pass, an ionizable gas sealed in the discharge tube, one anode installed in the discharge tube, and an anode facing the same. And a voltage supply circuit for applying a predetermined voltage to the electrode portion, wherein the voltage supply circuit is at least adjacent to the plurality of cathodes. It is characterized in that the voltage is applied to the cathodes not at the same time but at different times.
- the application time of the voltage supplied from the voltage supply circuit to each electrode unit and the magnitude of the applied voltage are made variable according to the material of the electrode. This makes it possible to compensate for differences in sensitivity due to differences in electrode materials. You.
- a predetermined voltage is applied to a plurality of ultraviolet detectors having different cathode materials from each other so that the adjacent ultraviolet detectors are not simultaneously supplied with a predetermined voltage. Adjacent detectors do not adversely affect each other at the time of discharge, and electromagnetic shielding and other additional structures are not required.
- an electrode portion is constituted by one (common) anode and a plurality of cathodes made of different materials in one discharge tube, that is, a plurality of types of detectors are integrated. Since a single discharge tube covers a plurality of UV detection areas, the whole is made smaller and the handling is convenient because it is a single device.
- the air-fuel ratio can be calculated by detecting the ultraviolet rays emitted from the combustion flame, and it can be determined whether the state of the flame is normal or abnormal. Therefore, an ultraviolet detector suitable for various uses such as diagnosis of the condition of a combustion furnace used for quenching and detection of fire in various facilities is provided.
- FIG. 1 is a diagram showing an ultraviolet detector according to a first embodiment of the present invention.
- FIG. 2 is a diagram showing an example of a drive circuit for detecting ultraviolet rays by applying a predetermined voltage to three ultraviolet detectors in the embodiment of FIG.
- FIG. 3 is a diagram showing an operation of detecting ultraviolet rays by sequentially turning the three ultraviolet detectors of FIG. 1 into an ON state.
- FIG. 4 is a view showing a light emission spectrum in a wavelength region where components such as NO, OH, and CH in a flame to be detected appear.
- Figure 5 is a graph showing the correlation between the emission ratio of the components generated by combustion and the air ratio.
- FIG. 6 shows that among the three ultraviolet detectors shown in Fig. 1, the kazode is made of Cu and Ag.
- FIG. 7 is a diagram showing a change in the wavelength region of ultraviolet light detected by the detector provided with the low-pass filter of FIG.
- FIG. 8 is a diagram showing an ultraviolet detector according to a second embodiment of the present invention.
- FIG. 9 is a flowchart showing a procedure of a flame detection process using the ultraviolet detector of the embodiment.
- FIG. 1 shows the configuration of an ultraviolet detecting device according to a first embodiment of the present invention.
- This detection device is configured by arranging a plurality of (three in the illustrated case) discharge tube type ultraviolet detectors 1, 2, and 3 toward the ultraviolet light incident side.
- Each of the ultraviolet detectors 1, 2, and 3 has a pair of electrodes (anode 11 and cathode 12) placed in parallel in a discharge tube 10 made of ultraviolet transmitting glass at a predetermined interval.
- the discharge tube 10 is filled with an ionizable gas (pening gas) in common, the cathode (force source) 12 of each detector is made of a different material (W, Cu in the illustrated case). , A g).
- the anode (anode) 11 is made of a mesh-like metal material (for example, Mo, Ni, or W). By forming the anode 11 in a mesh shape, the ultraviolet rays enter the inside from the upper end of the discharge tube 1 ⁇ and hit the force sword 12. As described above, this type of ultraviolet detector is in a discharged state when ultraviolet light hits a cathode while a voltage of about 300 volts is applied between a pair of electrodes (on state). Ultraviolet light can be measured by detecting the resulting current.
- a mesh-like metal material for example, Mo, Ni, or W.
- a pair of electrodes namely, the anode 11 and the force sword 12 are discharged by the metal rod-shaped support members 13 and 14 connected to each other. It is supported in parallel close proximity to the upper inside of tube 10.
- Each of the ultraviolet detectors 1, 2, and 3 is driven by, for example, a drive circuit shown in FIG.
- This drive circuit is configured to sequentially drive the ultraviolet detectors 1, 2, and 3 having the cathodes 12 made of different materials as described above to the ON state.
- Each detector is in a discharge state by receiving ultraviolet rays in the on state, and the anode 1 1 To generate a pulse current from the power source 12 to the power source 12.
- the circuit shown in Fig. 2 is connected to the output side of the voltage circuit including the parallel circuit of the capacitor 21 and the diode 22 and the resistor 23 and the capacitor 24 connected to the secondary side of the transformer 20.
- the devices 1, 2, and 3 are connected in parallel, and a parallel circuit of a resistor 23 and a capacitor 24 is connected via a switch circuit 25 provided on each force source 12 side.
- the switch circuit 25 applies a predetermined voltage in the order of the ultraviolet detectors 1, 2, and 3 or changes the voltage depending on the situation (for example, when the amount of ultraviolet light from the flame is large, the voltage is reduced. ),
- a predetermined time for example, several tens of microseconds to several tens of milliseconds
- mechanical switching means having a movable contact 28 that can be sequentially switched at predetermined time intervals may be used.
- the secondary voltage is set to 136V
- the capacitor 21 is set to 4 x F
- the resistor 23 is set to 5100 ⁇
- the capacitor 24 is set to F
- the voltage of the capacitor 21 is 110V.
- the impedance of the detector 1, 2 or 3 connected to the movable contact 28 of the switch circuit 25 becomes extremely high, Current flows first through diode 22 and charges capacitor 21 during the first half cycle. In the next half cycle, little or no current will flow through this circuit. When the voltage is reversed again, only the leakage current flows through the diode 22 and the capacitor 21 is maintained in a charged state. This leakage current is insufficient to produce the output current.
- the detector In the presence of ultraviolet light, the detector conducts during the half-cycle of the alternating current applied to the transformer 20 and the capacitor 21 connects to the detector and the resistor 26 and the capacitor 27. Discharge through a parallel circuit. When the next half cycle of polarity reversal appears in transformer 20, capacitor 21 is recharged via diode 22.
- capacitor 21 alternates between charging and discharging, producing a current through diode 22 every other half cycle. This causes a voltage drop across resistor 23, which is maintained in series with it, which charges capacitor 24 and produces a voltage across it. During this time, the voltage across capacitor 27 is very small. If a short circuit occurs in the detector, its impedance becomes extremely small, so that the capacitor 21 is charged to a relatively high voltage via the diode 29 connected in parallel with this. That is, the extremely high charging voltage of the capacitor 21 reverse biases the diode 22 every other half cycle to reduce its conductivity. Therefore, the current flowing through the resistor 23 becomes extremely small or zero, and the charge of the capacitor 24 is reduced or becomes zero. When the capacitor 24 becomes uncharged, the voltage across it becomes zero. As long as ultraviolet light is incident, the detector turns off and charges the capacitor 21 in a half cycle, and the detector turns on and discharges the capacitor 21 in the next half cycle .
- the short circuit protection means is constituted by a parallel circuit of the resistor 26 and the capacitor 27 and the diode 29.
- a predetermined force is applied to a pair of electrodes in each discharge tube in the order of the ultraviolet detectors 1, 2, and 3 made of the power source 12 power W, Cu, and Ag.
- each of the ultraviolet detectors 1, 2, and 3 is sequentially turned on (operating) as shown in FIG. .
- an ultraviolet voltage strikes a force source while an AC voltage as shown in Fig. 3 is applied to a pair of terminals connected to the anode and cathode of each of the ultraviolet detectors 1, 2, and 3, respectively.
- Discharge occurs approximately every half cycle of the AC voltage.
- a signal current as shown is obtained.
- the terminal voltage becomes as shown by the broken line.
- FIG. 4 shows an emission spectrum (wavelength characteristic) in a wavelength region where components such as N ⁇ , OH, and CH appear in the flame to be detected according to the present invention.
- This Asechire down nitrous oxide (N 2 0) on the burner are examples of the flame.
- CH and CN in the region of approximately 310-400 (nm) respectively. It appears strongly.
- the work function ( ⁇ ) and the wavelength are classified as follows according to the type (material) of the electrodes of the discharge tube type detector as described above.
- ⁇ 2 3.85 to 4.38 eV (Cu), 4.04 to 4.77 eV (F e), 4.0 to 4.58 eV (Au), 4.07 to 419 eV (T a), 4.39 e V (C)
- ⁇ 3 3.08 to 3.56 eV (Ag), 2.98 to 4.43 eV (A 1), 2.24 e V (C a
- the work function ⁇ 1 corresponding to the electrode material mainly captures NO groups
- the work function ⁇ 2 captures OH and NO
- the work function ⁇ 3 captures N ⁇ , ⁇ H, CH, CN, C, etc. I can say.
- each force sword is made of a different material (eg, W, C u, Ag) to detect ultraviolet rays with multiple UV detectors, to obtain emission spectrum in the wavelength range corresponding to those materials, and to detect components such as NO and CH in the flame (The ratio of their intensities) can be calculated.
- a different material eg, W, C u, Ag
- the emission intensity due to combustion and the air ratio have a certain relationship as shown in FIG. This is due to the spectrum intensity of NO, OH and CH groups in the mixed gas of CH 4 (methane) and air generated when air is supplied and burned using natural gas as fuel. And the equivalent ratio (the reciprocal of the air ratio).
- the air ratio is the minimum amount of air (that is, oxygen) required for complete combustion of fuel (that is, 1). In theory, this is the required amount of air.
- the air may not mix well with the fuel, and as described above, more air is supplied to burn at higher temperatures. That is, the target air ratio is set higher than 1. At the time of combustion, it is necessary to detect the actual air ratio in order to control the supply amount of air or fuel so that the air ratio takes a target value.
- the emission intensity ratio of NO and CH in the flame is calculated by the ultraviolet ray detection device of the present invention as described above, the air ratio is obtained from the calculation result based on the above relationship.
- Fig. 6 shows the detection device consisting of a plurality of ultraviolet detectors shown in Fig. 1, and the light input sections of the ultraviolet detectors 2 and 3 in which the power source 12 is made of Cu and Ag (Fig. 1).
- a low-pass filter or a band-pass filter that passes only the longer ultraviolet rays from a predetermined wavelength (hereinafter, a case where a “low-pass filter” is used) 15 is used. Shows what was provided.
- the wavelength regions detected by the ultraviolet detectors 2 and 3 are respectively predetermined wavelengths (for example, 250 nm for Cu and 280 nm for Ag). The following parts are cut.
- a band-pass filter or a low-pass filter 15 is provided.
- the ultraviolet ray detectors 2 and 3 detect, it is possible to perform detection in the ultraviolet ray region classified according to the characteristics of each detector.
- spectra of components such as NO, OH, and CH Appears in each of the divided areas as described above, and therefore those components can be reliably detected by the detector corresponding to each area.
- spectroscopy has the effect of improving the accuracy of detection or analysis of the ultraviolet detector.
- FIG. 8 shows an ultraviolet detector according to a second embodiment of the present invention.
- This detector is common to the first embodiment in that an ionizable gas (pening gas) is filled in a discharge tube 30 made of ultraviolet transmission glass.
- a single anode (anode) 3 made of a mesh-like metal material placed inside and a cathode (force sword) 32 made of a plurality of (again, three) different materials are placed so as to face 1 1
- This embodiment differs from the first embodiment in that two discharge tube type detectors are formed.
- the three cathodes 32 are made of W, Cu, and Ag. Between the common anode 31 constituting the electrode section and each cathode 32, for example, a driving circuit shown in FIG. A voltage is applied to adjacent cathodes 32 not at the same time but at different times by a configured voltage supply circuit (not shown).
- the upper end face of the discharge tube 30 is extended from a predetermined wavelength at a position corresponding to the force source 32 made of Cu and A inside the discharge tube.
- the ultraviolet detection device of the above embodiment is not limited to the flame in the combustion furnace, but detects the abnormality of the flame in a cooking place or a cooking place using a fire, detects the state of the ignition flame in an automobile engine, or detects a fire in advance. It can also be suitably used for flame detection and the like in order to prevent the occurrence of fire.
- the ultraviolet ray detecting device not the light but the ultraviolet ray emitted from the fire which can develop into a fire is detected, so that the occurrence of a flame which causes a fire can be detected at an early stage.
- FIG. 9 is a flowchart illustrating an example of a flame detection method when the ultraviolet detection device of the above embodiment is used for fire prevention.
- the signal current generated by the three types of force swords made of W, Cu, and Ag
- FIG. 9 first, it is determined whether or not a flame is a flame based on whether or not a detector having a power source made of any of W, Cu, and Ag has detected ultraviolet rays. That is, it is checked in ST1 whether or not it has been detected with a force sword made of W. If it is "Yes", the signal amount (the amount of ultraviolet rays) is measured (ST2), and in the next ST3, C is detected. Check if it is detected with a u-made force sword, this is also
- the signal amount (the amount of ultraviolet rays) is measured (ST4), and in the next ST5, it is checked whether or not it was detected with an Ag force sword. If this is also "Yes", For example, the signal amount (the amount of ultraviolet rays) is measured (ST6). In the above case, since all detectors detected ultraviolet light, it is determined that the flame was present (ST7). Then, based on the signal amount detected and measured by each of the detectors, an operation for calculating the aforementioned “air ratio” is performed (ST8), and it is determined whether or not the obtained air ratio is within the set value.
- the ultraviolet detection signal is not zero, but is small (detection If the detection is insufficient or if the detection is intermittent, such as when the value is lower than the judgment threshold, it is possible to temporarily determine that there is “flame”. Specifically, as shown by the dashed block in FIG. 9, the signal amount measured in each of the above ST2, ST4, and ST6 is smaller than a predetermined value (upper threshold) for judging “flame”. Check if the detector is at a provisionally usable level (greater than the lower threshold), and if it is between the upper and lower thresholds, it is considered “provisionally usable”.
- the detector If it is less than or equal to the threshold value, it is determined that it is not a flame (ST11). As a result, it is possible to set the detector to be usable until a predetermined time limit has come even if the detector has a slightly deteriorated ultraviolet ray detection capability.
- the present invention is not limited to this, and an arbitrary configuration can be adopted by using a discharge tube type detector having a different detectable region depending on the material of the electrode. For example, reliability can be improved by preparing a plurality of sets of three types of discharge tubes as one set.
- an abnormal value of a discharge tube eg, an Ag electrode
- the wall temperature of the combustor is abnormally high.
- the occurrence of a phenomenon in which the temperature becomes abnormally high periodically can be detected.
- the output from the multiple discharge tubes is a predetermined value, but the output of the high-temperature flame
- the combustion furnace wall may become abnormally high due to flickering or the like.
- the combustion furnace wall or the bin blade of a gas turbine rotating at the exit of the combustion furnace deteriorates and becomes extremely hot
- only the discharge tube of the Ag electrode detects the abnormally high temperature.
- the output will fluctuate periodically.
- the ones with the same electrode eg, Ag
- the abnormally high temperature can be detected.
- the voltage applied to the electrodes may be alternating current, direct current, or rectangular wave.
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- General Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2003235842A AU2003235842A1 (en) | 2002-05-07 | 2003-05-06 | Ultraviolet detector |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002-131691 | 2002-05-07 | ||
JP2002131691A JP4521153B2 (ja) | 2002-05-07 | 2002-05-07 | 紫外線検出装置 |
Publications (1)
Publication Number | Publication Date |
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WO2003095958A1 true WO2003095958A1 (fr) | 2003-11-20 |
Family
ID=29416617
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2003/005653 WO2003095958A1 (fr) | 2002-05-07 | 2003-05-06 | Detecteur d'ultraviolets |
Country Status (4)
Country | Link |
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JP (1) | JP4521153B2 (ja) |
CN (1) | CN100414271C (ja) |
AU (1) | AU2003235842A1 (ja) |
WO (1) | WO2003095958A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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EP2439451A1 (de) * | 2010-10-08 | 2012-04-11 | BFI Automation Dipl.-Ing. Kurt-Henry Mindermann GmbH | Vorrichtung zur Erkennung des Vorhandenseins einer Flamme |
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JP2010122102A (ja) * | 2008-11-20 | 2010-06-03 | East Japan Railway Co | 紫外線検出装置及び離線検出記録計 |
JP2013029453A (ja) * | 2011-07-29 | 2013-02-07 | Azbil Corp | 火炎センサ |
JP5832948B2 (ja) * | 2012-03-30 | 2015-12-16 | アズビル株式会社 | 火炎検出装置 |
KR20150034035A (ko) * | 2013-09-25 | 2015-04-02 | 한국생산기술연구원 | 광센서를 포함하는 공연비 계측시스템 |
JP6815291B2 (ja) * | 2017-07-14 | 2021-01-20 | アズビル株式会社 | カソード電極選定支援方法および装置 |
JP7139198B2 (ja) * | 2018-08-30 | 2022-09-20 | アズビル株式会社 | 紫外線センサ |
KR102195375B1 (ko) * | 2019-03-28 | 2020-12-24 | 한국표준과학연구원 | 자외선 및 적외선의 동시측정이 가능한 화재감지센서 |
JP6948679B1 (ja) * | 2020-11-16 | 2021-10-13 | 東京瓦斯株式会社 | 空気比推定システム、空気比推定方法及びプログラム |
JP6948678B1 (ja) * | 2020-11-16 | 2021-10-13 | 東京瓦斯株式会社 | 空気比調整方法、空気比調整システム及びプログラム |
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US5487266A (en) * | 1992-05-05 | 1996-01-30 | General Electric Company | Combustion control for producing low NOx emissions through use of flame spectroscopy |
JPH0750249A (ja) * | 1993-08-06 | 1995-02-21 | Toshiba Corp | 電子ビーム描画装置 |
EP0809792B1 (de) * | 1995-02-14 | 2002-06-12 | GTA Sensorik GmbH | Einrichtung zur bestimmung der uv-strahlungsstärke und -dosis mittels uv-empfindlicher sensoren |
JP2001329862A (ja) * | 2000-05-19 | 2001-11-30 | Mitsubishi Heavy Ind Ltd | ガスタービンの火炎検出装置 |
-
2002
- 2002-05-07 JP JP2002131691A patent/JP4521153B2/ja not_active Expired - Lifetime
-
2003
- 2003-05-06 CN CNB03810220XA patent/CN100414271C/zh 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/ja active Application Filing
Patent Citations (5)
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JPS49855U (ja) * | 1972-04-03 | 1974-01-07 | ||
JPH0750149A (ja) * | 1993-06-02 | 1995-02-21 | Hamamatsu Photonics Kk | 光電陰極、光電管および光検出装置 |
JP2001196023A (ja) * | 2000-01-06 | 2001-07-19 | Hamamatsu Photonics Kk | 光電子増倍管 |
JP2001343280A (ja) * | 2000-06-02 | 2001-12-14 | Yamatake Corp | 火炎検出装置 |
JP2002033071A (ja) * | 2000-07-14 | 2002-01-31 | Mitsubishi Electric Corp | 電離箱検出器 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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EP2439451A1 (de) * | 2010-10-08 | 2012-04-11 | BFI Automation Dipl.-Ing. Kurt-Henry Mindermann GmbH | Vorrichtung zur Erkennung des Vorhandenseins einer Flamme |
Also Published As
Publication number | Publication date |
---|---|
AU2003235842A1 (en) | 2003-11-11 |
JP2003322562A (ja) | 2003-11-14 |
JP4521153B2 (ja) | 2010-08-11 |
CN100414271C (zh) | 2008-08-27 |
CN1653318A (zh) | 2005-08-10 |
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