JP3711294B2 - Flame detection and combustion diagnostic equipment - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a flame detection and combustion diagnostic apparatus, and more particularly to an apparatus for monitoring the presence or absence and combustion state of a flame in a combustion furnace such as a power plant for power generation. The present invention relates to a flame detection and combustion diagnostic device that facilitates the compatibility of the two.
[0002]
[Prior art]
In recent boilers for thermal power generation, burner ignition and extinguishing work are frequently performed by intermediate load operation and DSS (daily start / stop) operation, and a flame detector that detects the ignition and extinguishing status of the burner flame Is an important component. Most of the commonly used flame detectors are optical systems that detect the emission of flame and determine the presence or absence of flame. In a multi-burner furnace equipped with a large number of burners, such as a power generation boiler, a flicker analysis formula for determining the presence or absence of a flame from the intensity of a light flicker signal (flame emission signal) is used. (Hereinafter, the light detection type and flicker analysis type flame detector is simply referred to as a flame detector).
[0003]
FIG. 8 shows an example of a conventional flame detector. The flame detector of FIG. 8 receives light emitted from the burner flame 80 by a multi-field optical fiber probe 83 having three different observation fields 82, passes through the relay optical fiber 1, and flames by a photoelectric conversion (O / E) board 84. The light emission is converted into an electric signal, and the fire extinguishing of the flame is determined in the determination processing board 85 based on a specific frequency band component (flicker signal) of the electric signal. The determination result of the determination processing board 85 is sent to the burner automatic control device 89 via the relay board unit 88 to perform automatic control of the burner and to provide information to the host computer via the communication control board 86. FIG. 9 shows an example of the panel configuration of the flame detector. 9, O / E 1 to 24 are the photoelectric conversion board 84 of FIG. 8, SBC 1 to 24 are the determination processing board 85 of FIG. 8, CCB is the communication control board 86, and the relay board rack is a relay board unit. This is where 88 is stored. The flame detector panel 90 shown in FIG. 9 shows an example corresponding to 24 burners. FIG. 10 shows a configuration of a photodetector mounted on the photoelectric conversion (O / E) board 84. In this configuration, the light from the three relay optical fibers 1 is directly received by the three light receiving surfaces 100 through the light receiving window 102. The core diameter of the repeater optical fiber 1 is 200 μm, while the light receiving surface has a size of about 2.4 × 2.4 mm, taking into account the optical axis misalignment of the repeater optical fiber and the relative misalignment of the photodetector. Less need.
[0004]
Moreover, it is desired that nitrogen oxides, soot, and carbon monoxide are not generated as much as possible in a combustion apparatus such as a boiler from the viewpoint of environmental measures. In order to form such a combustion state, it is necessary to form a flame in which the fuel and air are appropriately mixed in the combustion furnace, thereby preventing an extremely high temperature region and an extremely low temperature region from being formed in the combustion furnace. is necessary. One of the devices for monitoring the combustion state is a spectroscopic combustion diagnostic device (hereinafter referred to as a combustion diagnostic device) for diagnosing the combustion state from the result of spectral analysis of the radiation light of the combustion flame for a predetermined number of wavelengths. ). In recent large-capacity thermal power generation boilers that are multi-burner furnaces, flame holding of a large number of individual burners is the most important, and it is necessary to diagnose the combustion state of each burner. Similarly, there is an apparatus provided with an optical sensor having the configuration shown in FIG. 11 as an apparatus that integrates functions with a flame detector installed for each burner. This optical sensor is a flame emission analysis sensor that combines the flicker component analysis function of flame emission for flame detection and the spectral analysis function at several wavelengths for combustion diagnosis. Type flame sensor or simply flame sensor.
[0005]
The conventional flame sensor / combustion diagnostic combined flame sensor shown in FIG. 11 includes optical fibers 1 corresponding to the number of visual fields, a collimator rod lens 110, a glass block 111, optical interference bandpass filters 112 to 116, and light for combustion diagnosis. It mainly comprises detectors 117 to 121 and a light detector 122 for detecting flames. The flame emission transmitted from the optical fiber 1 is converted into parallel rays by the rod lens 110 and enters the glass block 111. Most of the light incident on the glass block 111 is reflected by the optical interference bandpass filters 112 to 116, propagates through the glass block 111 by multiple reflection, is received by the flame detection photodetector 122, and is received by the electric signal 128. Is converted to In the process of multiple reflection in the optical interference bandpass filters 112 to 116, only light in a narrow wavelength band determined by the film material, film thickness, and number of layers of each interference filter is transmitted through the interference filters 112 to 116, and light detection for combustion diagnosis is performed. It is converted into electrical signals 123 to 127 by the devices 117 to 121. Features of the flame combustion state (flame temperature, gas absorption, etc.) are extracted from the spectroscopic analysis results at five predetermined wavelengths obtained from the output electrical signals 123 to 127 of the photodetectors 117 to 121 for combustion diagnosis, and flame detection is performed. The flicker component of the flame emission is analyzed from the output electric signal 128 of the light detector 122 for use, and the presence or absence of the flame is determined. The configuration shown in FIG. 11 is provided for each field of view, and in the case of three fields of view, three are arranged in parallel in the direction perpendicular to the paper surface.
[0006]
[Problems to be solved by the invention]
In the prior art shown in FIG. 11, the flame detection function and the combustion diagnosis function are realized by using the same multi-view type optical fiber probe and relay optical fiber cable, but they are already installed in a combustion furnace such as a boiler. The compatibility with existing flame detectors as shown in FIGS. 8 and 9 is not considered. Even in the case of a new installation, if the conventional flame detector can be used almost as it is, an increase in costs for inspection, production, installation, etc. can be suppressed, a new function can be added, and a low-cost system can be provided. However, there are the following problems in providing compatibility with existing flame detectors.
[0007]
In recent large-capacity thermal power generation boilers, which are multi-burner furnaces, it is most important to hold the flames of each of the burners. For the sake of maintainability and reliability, the flame detector has a flame condition for each burner. Sensor units for detecting and judging the above and control units for adjusting the combustion state based on the sensor units are distributed. In addition, an increase in the size of the flame detector panel is not appropriate due to the significant increase in cost and the size limitation of the equipment room where the panel is installed. Corresponding to the burner, it is necessary to reduce the size and number of installed panels. For this reason, the sensor unit installed for each burner also needs to be downsized.
[0008]
As a means to easily add a combustion diagnostic function by spectroscopic analysis to an existing flame detector, the existing flame detector sensor unit is compatible with the existing one in terms of input, output, and unit appearance. It is considered that it is better to replace the sensor with a combination of the flame detection function and the combustion diagnosis function shown in FIG.
In order to mount it on a compatible board and incorporate it into an existing board, it is necessary to make the optical sensor compact and robust. The miniaturization of the optical sensor shown in FIG. 11 can be achieved by arraying the photodetectors instead of individually attaching the photodetectors for each outgoing light. Since other glass blocks, lenses, interference filters, and the like are typical parts of micro-optics, it is easy to obtain highly accurate ones with a size of about 1 mm to several mm. However, the downsizing makes it difficult to align the optical axis. In particular, the conventional repeater optical fiber for the flame detector is designed to be connected to the photodetector shown in FIG. There was no need to have. The alignment between the optical fiber and the light receiving surface of the photodetector is easy because of the large difference in size between the two, and there is little need for the central axes of the two to coincide. On the other hand, the alignment of the optical fiber and the spectroscopic optical system including the lens shown in FIG. 11 which are reduced in size changes the propagation angle and spread of the light beam due to the deviation of the central axis, causing a great loss. . This has a greater effect as the size decreases.
[0009]
In addition, an array of photodetectors (117 to 122) necessary for downsizing the optical sensor shown in FIG. 11 is also a factor that makes it difficult to align the optical axis with the spectroscopic optical system due to its assembly method. The photoelectric detector for the photoelectric conversion board of the conventional flame detector shown in FIG. 10 is also a linear array having three light receiving surfaces, and will be described with reference to this figure. Three light receiving surfaces 100 are formed on the substrate 104. This is performed by cutting out a single light receiving surface and arranging a plurality of light receiving surfaces, or by forming a mask and forming a semiconductor film on a substrate. Although the relative positional accuracy between the light receiving surfaces is high, the problem is the positional relationship with the case 101. Only the light-receiving surface is severely degraded by the environment, and cases such as metal, ceramic, and resin are required. The light receiving surface is fixed in this case and wired with an output lead pin or the like. Generally, there is no guarantee of accuracy in the positional relationship between the case and the light receiving surface in the case, and the dimensional tolerance of the case itself is ± 0. It is as large as 3 to 0.5 mm. In addition, it is necessary to further reduce the manufacturing accuracy of the case in order to array the photodetectors at a low cost.
[0010]
In such a case, the optical axis adjustment is generally performed while monitoring so that the output electric signal after photoelectric conversion is maximized, or the adjustment is performed while inputting visible light and checking the spot. Such adjustment for each of the sensors installed in each of the many burners is problematic in terms of cost and reliability.
An object of the present invention is to solve the above-mentioned problems of the prior art, downsize the apparatus for performing flame detection and combustion state diagnosis with high accuracy, and to detect flame with improved compatibility with conventional flame detectors. And providing a combustion diagnostic apparatus.
[0011]
[Means for Solving the Problems]
In order to achieve the above object, the invention claimed in the present application is as follows.
(1) A relay optical fiber that transmits the flame emission received by the optical probe, and the flame emission transmitted by the relay optical fiber, and accepts the predetermined plurality of narrow wavelength bands from the monochromatic light and the flame emission. A photoelectric conversion unit that splits light into other wavelength ranges excluding monochromatic light in the wavelength band and converts it into an electrical signal corresponding to the intensity of the split light, and the intensity of the monochromatic light in a plurality of predetermined narrow wavelength bands In a flame detection and combustion diagnostic apparatus comprising means for performing combustion diagnosis from analysis and means for performing flame ignition and extinguishing determination from flicker (flicker) component analysis of electrical signals according to light intensity in other wavelength ranges, A light receiving optical fiber having a core diameter larger than that of the relay optical fiber that receives the light emitted from the relay optical fiber, and a condensing lens that prevents spreading of the light emitted from the light receiving optical fiber; Means for suppressing the influence of optical axis deviation of the relay optical fiber comprising a rod lens that converts the light beam collected by the optical lens into a parallel light beam; A flame detection and combustion diagnostic apparatus, characterized by comprising means for spectrally dividing into a wavelength range and converting it into an electrical signal corresponding to the intensity of the split light.
[0012]
(2) The relay optical fiber that transmits the flame emission received by the optical probe, and the flame emission transmitted by the relay optical fiber are received, and the monochromatic light is removed from a predetermined plurality of narrow wavelength band monochromatic light and flame emission. A photoelectric conversion unit that splits light into other wavelength bands and converts them into electrical signals according to the intensity of the split light; and means for performing combustion diagnosis from intensity analysis of a predetermined plurality of narrow wavelength bands of monochromatic light; In the flame detection and combustion diagnostic apparatus comprising means for performing ignition and extinguishing judgment from flicker component analysis of electrical signals according to light intensity in other wavelength ranges, the photoelectric conversion unit is configured to output the relay optical fiber. Means for receiving incident light and suppressing the influence of the optical axis deviation of the repeater optical fiber so as to be incident as a parallel beam; and a glass configured to propagate the incident light to two opposing surfaces by multiple reflection. Spectroscopic means comprising a block and a plurality of optical interference bandpass filters that are arranged at the multiple reflection propagation position of the glass block and transmit light of a specific wavelength, and multiplexed with the transmitted light of the plurality of optical interference bandpass filters Light detection that converts a plurality of rod lenses that receive reflected light, a member that holds the rod lens to the spectroscopic means, and a plurality of light receiving surfaces that respectively receive the emitted light of the rod lenses and converts the emitted light into an electrical signal A flame detection and combustion diagnostic apparatus comprising: an element.
[0013]
(3) The relay optical fiber that transmits the flame emission received by the optical probe, and the flame emission transmitted by the relay optical fiber is changed from the monochromatic light and the flame emission of the predetermined multiple points to the wavelengths of the predetermined multiple points. It consists of a photoelectric conversion unit that splits into light of other wavelength ranges excluding monochromatic light, and converts each of monochromatic light of a predetermined plurality of wavelengths and light of other wavelength ranges into an electric signal according to the light intensity, Combustion diagnosis is performed from single-color light intensity analysis at a plurality of predetermined wavelengths, and flame detection and combustion diagnosis is performed to determine flame ignition and extinction from flicker component analysis of electrical signals according to light intensity in other wavelength ranges In the apparatus, the photoelectric conversion unit receives the outgoing light from the relay optical fiber, and prevents the light receiving optical fiber having a larger core diameter than the relay optical fiber and the spread of the outgoing light from the light receiving optical fiber. Means for suppressing the effect of optical axis deviation of the relay optical fiber consisting of a rod lens that converts the light collected by the optical lens and the condensing lens into parallel light, and the output light of the relay optical fiber is offset from the optical axis of the relay optical fiber A spectroscopic means comprising a glass block incident through a means for suppressing the influence of the light, a plurality of optical interference bandpass filters arranged so that incident light propagates by multiple reflection on at least two surfaces of the glass block, and the plurality A plurality of rod lenses that receive the transmitted light and the multiple reflected light of a single optical interference bandpass filter, a member that holds the rod lens in the spectroscopic means, and a plurality of light receiving surfaces that receive the emitted light from the rod lens A light detection element array that converts the light into an electrical signal, and a through hole that matches the arrangement of the light receiving surfaces of the rod lens and the light detection element array. Flame detection and combustion diagnosis device utilizing a pin for optical axis alignment, and characterized by comprising the alignment member utilizing light receiving surface of the detector array as a marking for the optical axis alignment for.
[0014]
[Action]
In order to suppress the influence of the optical axis deviation with respect to the conventional flame detector repeater optical fiber 1 which has a problem in optical axis alignment accuracy with respect to the spectroscopic optical system, the core diameter is larger and the refractive index distribution parameter is It is a simple means to receive light with an optical fiber that is equal to or more than a relay optical fiber. However, since the outgoing light spot of the optical fiber having a large core diameter and a large refractive index distribution parameter and the spread of the outgoing light are larger than those of the relay optical fiber, it is difficult to convert them into parallel rays with a single rod lens. The beam diameter and divergence angle of the light beam propagating in the block is increased, and the loss is increased. Conversion of incident light spread by the rod lens into parallel light has the highest effect when the incident light is a point light source. Therefore, in the present invention, it is possible to effectively convert the light emitted from the optical fiber by the condenser lens so as to be focused on the optical axis of the incident end of the rod lens. As a result, even if the optical axis shift occurs between the repeater optical fiber and the light receiving optical fiber that receives the light emitted from the repeater optical fiber, the influence on the light beam propagating in the spectroscopic optical system such as the glass block can be suppressed. it can. Further, this can suppress not only the axial deviation caused by the manufacturing accuracy but also the influence of changes in the optical fiber connection state (axial deviation, gap, etc.) caused by vibration.
[0015]
Regarding the connection with the light detection element array, the relative positional accuracy between the light receiving surfaces is relatively high as described above. Therefore, the positional relationship with the case and the accuracy are not considered, and the light receiving is performed as shown in FIGS. The surface itself is used as a mark for aligning the optical axis, and a rod lens 11 is provided for guiding and collecting the emitted light from the spectroscopic system to the light receiving surface of the light detection element array, and this rod lens itself is a pin for alignment. As a result, it is possible to reliably couple the photodetecting element array and the spectroscopic optical system with a simple configuration.
[0016]
Therefore, according to the present invention, the optical sensor of FIG. 11 can be reduced in size, and can be mounted on a photoelectric conversion board compatible with a conventional flame detector and can be connected with a low-loss optical fiber. It is possible to provide a high-performance flame detector to which a spectroscopic combustion diagnosis function is newly added using a conventional flame detector system regardless of whether it is newly installed.
The present invention solves the above-mentioned problems by the following means, reduces the size of the optical sensor of FIG. 11, and achieves low loss between the mounting on the photoelectric conversion board compatible with the conventional flame detector and the relay optical fiber. By enabling the connection, it is possible to provide a high-performance flame detector to which a spectroscopic combustion diagnosis function is newly added by using a conventional flame detector system regardless of whether it is installed or not.
[0017]
(1) A light receiving optical fiber having a core diameter larger than that of the relay optical fiber that receives light emitted from the relay optical fiber, a condensing lens that prevents the beam diameter from spreading, and a light beam collected by the condensing lens is a parallel light beam. A collimator consisting of a rod lens that converts to.
(2) Photodetector array having a plurality of light-receiving surfaces arranged in a grid, rod lenses corresponding to the number of light-receiving surfaces that collect the light emitted from the spectroscopic system on the photodetector array, and the rod lenses A light detecting element array optical axis aligning means comprising an alignment member that uses a plurality of light receiving surfaces arranged in a grid pattern as optical axis alignment markings.
[0018]
(3) Easily align the optical axis and reduce the loss to improve performance and reduce costs by simplifying the process. In addition, the simple configuration reduces the size and makes the device easier to mount.
【Example】
The structure of the optical sensor for realizing compatibility with the conventional flame detector according to the present invention is shown in FIG. 1 for one field of view. The optical sensor of FIG. 1 includes an optical fiber 2 having a core diameter of 400 μm, a collimator 3, a glass block 5, optical interference bandpass filters 6 to 10, and optical interference bandpass filters 6 to 10. Is mainly composed of a rod lens 11 that receives the transmitted light to the light detection element arrays 13 and 14, a holder 12 that holds the rod lens 11, and an alignment member 15 that couples the rod lens 11 and the light detection element array 13. The For a plurality of visual fields, the configuration of FIG. 1 is arranged for the number of visual fields in a direction penetrating the paper surface. In this embodiment, there are three fields of view.
[0019]
An enlarged view of the collimator 3 is shown in FIG. The collimator 3 includes a ferrule 23 for performing optical axis alignment and holding of a light receiving optical fiber 2 having a core diameter of 400 μm, a ball lens 20 having a diameter of 1 mm for converging light emitted from the optical fiber having a core diameter of 400 μm, It comprises a lens guide 21 for performing optical axis alignment with an optical fiber having a core diameter of 400 μm and a rod lens 22 having a diameter of 2 mm. In the collimator 3, the light emitted from the optical fiber 2 with a core diameter of 400 μm is first received by the spherical lens 20 and condensed on the optical axis of the incident surface of the rod lens 22. The rod lens 22 converts the light emitted from the spherical lens 20 into parallel rays, and enters the light into a spectroscopic system including the glass block 5 and the interference bandpass filters 6 to 10 in FIG.
[0020]
The light beam 4 incident on the spectroscopic system propagates through the glass block 5 with multiple reflections, and only the transmission wavelength components of the optical interference bandpass filters 6 to 10 are transmitted through the interference bandpass filters 6 to 10 in the process of multiple reflection. Then, the light enters the photodetector element array 13 through the rod lens 11 having a diameter of 2 mm and is converted into an electric signal. The spectral function is the same as that of the optical sensor shown in FIG.
[0021]
FIG. 3 shows a detailed configuration of the photodetecting element array 13. Moreover, the dimension of the Example was written together. In this embodiment, the case 30 of the photodetecting element array is made of ceramic in order to reduce the size. Nine light-receiving surfaces 31 a to 31 i are arranged in a lattice pattern on a base 32 positioned in the ceramic case 30. The size of the light receiving surfaces 31 a to 31 i is substantially the same size as the rod lens 11. In FIG. 1, the light receiving surfaces 31a, 31d and 31g are transmitted light from the interference bandpass filter 6, the light receiving surfaces 31b, 31e and 31h are transmitted light from the interference bandpass filter 8, and the light receiving surfaces 31c, 31f and 31i are interference bandpass. Light transmitted through the filter 10 is received through the rod lens 11. The light receiving surfaces 31a to 31c, 31d to 31f, and 31h to 31i correspond to the observation visual fields 82a, 82b, and 82c of the multi-field optical fiber probe 83.
[0022]
FIG. 4 shows attachment of the photodetecting element array 13 of the alignment member 15. The alignment member 15 is not attached based on the positional relationship of the light detection element array 13 with respect to the case 30 but based on the positional relationship between the through holes 41 and the light receiving surface 31 arranged at the same interval as the light receiving elements. The light receiving surfaces 31 arranged in a grid pattern of the light detection element array 13 are positioning markings. Thus, the alignment with the light receiving surface can be surely and easily performed regardless of the dimensional tolerance of the case 30 and the positional relationship between the case and the light receiving surface. Further, the dimensional tolerance of the case 30 does not need to be accurate, and the manufacturing and inspection processes can be simplified, thereby reducing the cost.
[0023]
FIG. 5 shows a method of coupling the spectroscopic system including the glass block 5 and the interference bandpass filters 6 to 10 and the photodetecting element arrays 13 and 14. By aligning and connecting the through hole 41 of the alignment member 15 attached to the photodetecting element arrays 13 and 14 and the lens holder 12 with the rod lens 11 as a pin, it can be reliably and easily coupled.
[0024]
With the configuration described above, it is a problem in terms of downsizing the optical sensor, which is necessary for the combined use of the flame detection function and the combustion diagnosis function and for compatibility with the photoelectric conversion board of the conventional flame detector. In addition, the optical axis deviation of the relay optical fiber can be suppressed, and the optical axis can be reliably and easily aligned with the light receiving surface of the light detecting element array.
FIG. 6 and FIG. 7 show a panel configuration of a flame detector according to the present invention in which a combustion diagnostic function is added to the conventional flame detector.
[0025]
6 and 7, the conventional SBC (determination processing board), CCB (communication control board), relay board rack and board itself of the flame detector board 60 are used as they are, and a photoelectric conversion (O / E) board is used. 1 is replaced with a compatible photoelectric conversion board 61 with a spectroscopic analysis function, and a new board 62 for collecting spectral data for combustion diagnosis is connected to the data collection board 62 via a network 63. It is possible to add a combustion diagnostic function to a conventional flame detector regardless of whether it is newly installed or simply by adding a panel 70 containing an analysis computer for combustion diagnosis, a display device and the like.
[0026]
【The invention's effect】
According to the present invention, the apparatus can be made extremely compact and highly accurate by suppressing the influence of optical axis deviation, and the optical fiber probe and the relay light can be used not only in a new installation but also in an existing flame detector. By using the fiber cable and the panel as they are and replacing only the sensor unit with a compatible board equipped with a spectral analysis function for combustion diagnosis, it is possible to provide a rational system that can easily add an individual burner combustion diagnosis function.
[Brief description of the drawings]
FIG. 1 is a diagram showing the configuration of a photosensor with a flame analysis / combustion diagnosis combined spectral analysis function according to the present invention.
FIG. 2 is a detailed view of a collimator unit of the optical sensor according to the present invention.
FIG. 3 is a diagram showing a configuration of a photodetecting element array for photosensors according to the present invention.
FIG. 4 is a diagram showing a configuration of a photodetecting element array alignment member.
FIG. 5 is a diagram showing coupling between a photodetecting element array and a spectroscopic optical system.
FIG.
FIG. 7 is a diagram showing a configuration of a system in which a combustion diagnosis function is added to a conventional flame detector according to the present invention.
FIG. 8 is a diagram showing a configuration of a conventional flame detector.
FIG. 9 is a diagram showing a panel configuration of a conventional flame detector.
FIG. 10 is a view showing a photodetector for photoelectric conversion board of a conventional flame detector.
FIG. 11 is a diagram showing a configuration of an optical sensor in which a conventional flame detection function and a combustion diagnosis function are used in combination.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Relay optical fiber (200 micrometers), 2 ... 400 micrometers optical fiber (light receiving optical fiber), 3 ... Collimator, 4 ... Propagating light beam, 5 ... Glass block, 6-10 ... Optical interference band pass filter, 11 ... Rod lens (Diameter 2 mm), 12 ... holder, 13, 14 ... photodetecting element array, 15 ... alignment member, 17 ... flame emission.

Claims (3)

A relay optical fiber for transmitting the flame emission received by the optical probe, and a flame emission transmitted by the relay optical fiber, and receiving a plurality of predetermined narrow wavelength band monochromatic light and flame emission from the predetermined plurality of narrow wavelength bands. A photoelectric conversion unit that splits the light into other wavelength ranges excluding monochromatic light and converts it into an electrical signal according to the intensity of the separated light, and burns from the intensity analysis of monochromatic light in a plurality of predetermined narrow wavelength bands In the flame detection and combustion diagnostic apparatus, comprising the means for performing diagnosis and the means for performing flame ignition / extinguishing determination from flicker (flicker) component analysis of electrical signals according to light intensity in other wavelength ranges, the photoelectric conversion A light receiving optical fiber having a core diameter larger than that of the relay optical fiber that receives the light emitted from the relay optical fiber, a condensing lens that prevents spreading of the light emitted from the light receiving optical fiber, and a light collecting lens. Means for suppressing the influence of optical axis misalignment of the relay optical fiber comprising a rod lens for converting the light collected by the lens into parallel light, and receiving the light from the rod lens to the predetermined wavelength band and wavelength And a flame diagnostic apparatus characterized by having a means for spectrally dividing the light into a region and converting it into an electrical signal in accordance with the intensity of the dispersed light. A relay optical fiber that transmits the flame emission received by the optical probe, and the flame emission transmitted by the relay optical fiber to receive a plurality of monochromatic lights in a predetermined narrow wavelength band and other wavelengths obtained by removing these monochromatic lights from the flame emission. A photoelectric converter that splits light into a band of light and converts it into an electrical signal corresponding to the intensity of the split light, a means for performing combustion diagnosis from intensity analysis of monochromatic light in a plurality of predetermined narrow wavelength bands, In a flame detection and combustion diagnostic apparatus comprising a means for performing flame ignition / extinguishing judgment from flicker component analysis of an electrical signal according to light intensity in a wavelength range, the photoelectric conversion unit receives light emitted from a relay optical fiber. And means for suppressing the influence of the optical axis deviation of the repeater optical fiber and making it incident as a parallel light beam, and a glass blower configured to propagate the incident light to two opposing surfaces by multiple reflections. And a plurality of optical interference band-pass filters arranged at the multiple reflection propagation position of the glass block and transmitting light of a specific wavelength, and multiplexed with the transmitted light of the plurality of optical interference band-pass filters Light detection that converts a plurality of rod lenses that receive reflected light, a member that holds the rod lens to the spectroscopic means, and a plurality of light receiving surfaces that respectively receive the emitted light of the rod lenses and converts the emitted light into an electrical signal A flame detection and combustion diagnostic apparatus comprising: an element. The relay optical fiber that transmits the flame emission received by the optical probe, the flame emission transmitted by the relay optical fiber, the monochromatic light at the predetermined multiple wavelengths and the monochromatic light at the predetermined multiple wavelengths from the flame emission. It consists of a photoelectric conversion unit that splits the light into the other wavelength regions, and converts each of the monochromatic light at the predetermined multiple points and the light at the other wavelength regions into an electrical signal corresponding to the light intensity. In the flame detection and combustion diagnostic device that performs combustion diagnosis from monochromatic light intensity analysis of the wavelength of the point, and performs flicker (flicker) component analysis of the electrical signal according to the light intensity in the other wavelength range to determine the ignition and extinguishing of the flame, The photoelectric conversion unit receives light emitted from the repeater optical fiber, and receives a light receiving optical fiber having a core diameter larger than that of the repeater optical fiber, and a condensing light that prevents the spread of the light emitted from the light receive optical fiber. And means for suppressing the influence of the optical axis deviation of the relay optical fiber comprising a rod lens that converts the light collected by the condensing lens into a parallel light, A spectroscopic means comprising a glass block incident through a means for suppressing influence, a plurality of optical interference bandpass filters arranged so that incident light propagates by multiple reflection on at least two surfaces of the glass block, and the plurality of sheets A plurality of rod lenses that receive the transmitted light and multiple reflected light of the optical interference bandpass filter, a member that holds the rod lens in the spectroscopic means, and a plurality of light receiving surfaces that receive the emitted light of the rod lens, It has a light detection element array that converts it into an electrical signal, and a through hole that matches the arrangement of the light receiving surface of the rod lens and light detection element array. Utilized as a pin for a laminated and flame detection and combustion diagnosis apparatus characterized by comprising a positioning member for use as a marking for the optical axis alignment of the light receiving surface of the detector array.

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