CN105651747B - It is a kind of for pinpoint capture flame radical fluorescence intensity measuring device - Google Patents
It is a kind of for pinpoint capture flame radical fluorescence intensity measuring device Download PDFInfo
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- CN105651747B CN105651747B CN201610007913.5A CN201610007913A CN105651747B CN 105651747 B CN105651747 B CN 105651747B CN 201610007913 A CN201610007913 A CN 201610007913A CN 105651747 B CN105651747 B CN 105651747B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
- G01N21/64—Fluorescence; Phosphorescence
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
- G01N21/64—Fluorescence; Phosphorescence
- G01N2021/6417—Spectrofluorimetric devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
- G01N21/64—Fluorescence; Phosphorescence
- G01N21/645—Specially adapted constructive features of fluorimeters
- G01N2021/6463—Optics
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
- G01N21/64—Fluorescence; Phosphorescence
- G01N21/645—Specially adapted constructive features of fluorimeters
- G01N2021/6484—Optical fibres
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
- G01N21/64—Fluorescence; Phosphorescence
- G01N2021/6491—Measuring fluorescence and transmission; Correcting inner filter effect
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- Life Sciences & Earth Sciences (AREA)
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- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
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- Pathology (AREA)
- Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)
Abstract
It is especially a kind of for pinpointing the measuring device for capturing flame radical fluorescence intensity the present invention relates to combustion diagnosis equipment.The invention discloses a kind of measuring devices of station acquisition flame radical fluorescence intensity, including light acquisition unit, light transmission unit and photosensitive unit.The light acquisition unit is made of Cassegrain's camera lens；Light transmission unit includes optical fiber, collimating mirror and optical filter；Photosensitive unit includes black box, photomultiplier tube and data collector.Cassegrain's camera lens is for pinpointing acquisition flame light；Optical fiber is used for transmission light；Collimating mirror makes the change diverging light beams projected from optical fiber at collimated light beam；The bayonet of optical filter and collimating mirror is arranged on the side wall surface of black box, and optical filter is between collimating mirror and photomultiplier tube；Photomultiplier tube is located in black box, and the output signal of photomultiplier tube is connected by pin circuit output with data collector, is shown by data collector and handles the electric signal exported.Maximum feature of the invention is to pinpoint the intensity signal for obtaining flame radical.
Description
Technical field
It is especially a kind of for pinpointing the measurement for capturing flame radical fluorescence intensity the present invention relates to combustion diagnosis equipment
Device.
Background technique
Fuel combustion is phenomenon common in power-equipment, and carrying out in-depth study to combustion position helps to grasp burning
Characteristic, thus the discharge for improving combustion technology, improving efficiency of combustion, reducing pollutant.Since flame radical fluorescence intensity exists
It can reflect the flame parameters information such as flame temperature, flame reaction region, free radical radical concentration, rate of heat release to a certain extent,
So the research for flame radical fluorescence intensity is of great significance.Flame radical fluorescence intensity is deeply ground
Study carefully and need good measurement means as tool, therefore, flame radical fluorescence intensity acquisition methods is explored and will be helped
In promotion to flame structure, the understanding of combustion characteristics.
The current measurement method about flame radical fluorescence intensity both at home and abroad, is concentrated mainly on and is induced using planar laser
The equipment such as fluorescence (PLIF), ICCD camera, obtain the Two dimensional Distribution picture of flame radical fluorescence intensity, and are directed to " fixed point " and obtain
The measurement method of flame radical fluorescence intensity is taken still to have vacant position.It is that 3mm ball is intracorporal that country's minimum, which can collect diameter, at present
The optical signalling of CH group, 3mm sphere is not sufficiently small in some cases.
Summary of the invention
In order to solve the problems, such as the prior art there are collected " tested region " is not small enough, the present invention provides one kind to adopt
Sample precision height, the measuring device for pinpointing capture flame radical fluorescence intensity.
The measuring device of one of present invention flame radical fluorescence intensity, including the transmission of light acquisition unit, light
Unit and photosensitive unit.It is characterized in that, light acquisition unit is made of Cassegrain's camera lens；Light transmission unit includes light
Fine, collimating mirror and optical filter；Photosensitive unit includes black box, photomultiplier tube and data collector.Cassegrain's camera lens is for fixed
Point acquisition flame light, rear end is equipped with optical fiber joint end mouth；The incidence end of optical fiber is connected with optical fiber joint end mouth, is used for transmission
Light；The exit end of optical fiber is connected with collimating mirror, and collimating mirror makes divergent beams be calibrated to collimated light beam；Optical filter and collimating mirror
Bayonet be arranged on the side wall surface of black box, optical filter is used to filter the light of different-waveband；Photomultiplier tube is located at black box
It is interior, for converting optical signals into electric signal；Optical filter is between collimating mirror and photomultiplier tube；The sense of photomultiplier tube
Answer form towards optical filter side, with plane parallel where optical filter；For connecting output signal on photomultiplier tube
Pin be located at the outside of black box；Respective lines in pin are connected with data collector, data collector for show with
Handle the electric signal of photomultiplier tube output.The measuring device, adjustable point captures the fluorescence intensity of flame radical, detectable
Wavelength band is in the ultraviolet free radical in visible light region；Flame tested region is diameter 0.1mm, high 0.8mm ~ 1.58mm's
Cylindrical region；The operating distance of measuring device is limited distance, and range is between 295mm ~ 306mm.
Preferably, Cassegrain's camera lens of the light acquisition unit includes primary mirror, secondary mirror and lens barrel, adopted for pinpointing
Collect the light of flame tested region；For the primary mirror for reflecting incident beam, the center of primary mirror is provided with through-hole, reflecting surface
For concave surface；The secondary mirror carries out secondary reflection to the light beam that primary mirror reflects, and the light beam after reflection is pierced by from through hole；Secondary mirror it is anti-
Penetrating face is convex surface, and the lens barrel is for fixing primary mirror and secondary mirror, and lens barrel front end is equipped with for controlling the diaphragm of light-inletting quantity, rear end is set
Have optical fiber joint end mouth, primary mirror and secondary mirror are coaxial, secondary mirror between primary mirror and tested flame, the concave surface of primary mirror and secondary mirror it is convex
Face is opposite.
Preferably, Cassegrain's camera lens primary mirror radius of curvature is r, through-hole diameter is too small easily to shut out the light, is excessive
It is easily introduced veiling glare, through-hole diameter of the present invention is 0.12r ~ 0.14r；Secondary curvature radius is 0.5r ~ 0.6r, primary mirror and secondary mirror away from
From for 0.45r ~ 0.55r, diaphragm light passing diameter is 0.25r ~ 0.3r.The radius of curvature r of the primary mirror is 300mm ~ 305mm.Institute
Cassegrain mirror tail end is stated equipped with regulating member, it can be achieved that front and back, up and down, the fine tuning of left and right six direction, wherein up and down, it is left
Right adjustable range is in ± 1mm.Cassegrain's camera lens no color differnece can survey the free radical of different-waveband, and spherical aberration, coma
Small, picture point diameter is only 356 μm.
Preferably, the angle of divergence of the optical fiber has to be larger than the angle of focus on light beam, and core diameter has to be larger than picture
Spot diameter.Light beam to guarantee that Cassegrain's camera lens focuses can be properly received by the optical fiber of the measuring device, picture in the present invention
Spot diameter is 356 μm, and fibre core diameter is 960 μm.The selection of the optical fiber considers the wavelength band of different free radicals,
It can transmit the light within the scope of 200nm ~ 1200nm, there is good applicability.
Preferably, the collimating mirror of the measuring device is used to calibrate the divergent beams gone out from fiber exit end-fire, make it
It is changed into the directional light of a beam diameter 4mm ~ 6mm.The numerical aperture of the collimating mirror need to be with the numerical aperture phase of the optical fiber
Match, the two numerical aperture is 0.22.The collimated light beam diameter projected after collimating mirror, which is necessarily less than on photomultiplier tube, to be incuded
The size of form, it is 24mm × 8mm that photomultiplier tube, which incudes window dimension,.In addition, the permeable 200nm of the collimating mirror ~
Light within the scope of 2000nm.
Preferably, the optical filter of the measuring device, for filtering the light of flame sending, after being filtered by optical filter
Light be flame free radical light.By replacing the optical filter of different-waveband, the fluorescence that can survey different free radicals is strong
Degree.The optical filter wavelength band of OH base used in the present invention is 315nm ± 7.5nm, and the optical filter wavelength band of CH base is
427nm±5nm。
Preferably, the black box of the measuring device eliminates background light in use process for installing photomultiplier tube
Interference.The design of black box considers the leakage problem of black box wall surface junction, has carried out boss design to each wall surface.It is black
Case side wall surface is provided with an adapter, for fixing the collimating mirror and the optical filter.Optical filter be placed in adapter with
Between black box wall surface, adapter is screwed with black box wall surface by screw thread thereon and is fixed optical filter simultaneously.Among adapter
Equipped with the matched screw thread of collimating mirror, collimating mirror and adapter are fixed by threaded engagement.
Preferably, the photomultiplier tube of the measuring device, induction form thereon filters for receiving through optical filter
Light beam afterwards, induction window dimension are 24mm × 8mm.Incident ray is irradiated on induction form, inside photomultiplier tube
Photocathode, dynode system, optical signal conversion is electric signal, and defeated from the anode of photomultiplier tube in the form of electric current
Out.The output current circuit of photomultiplier tube is encapsulated in the pin of photomultiplier tube.
Beneficial effects of the present invention: flame radical fluorescence intensity measurement device of the invention has the following characteristics that 1, card
Plug Green's camera lens can realize that acquisition diameter is 0.1mm, and the flame light in a height of 0.8mm ~ 1.58mm cylindrical region subtracts significantly
The small volume of tested region, reduces limitation of the tested region size to flame size；2, Cassegrain mirror head-tail optical fiber
Junction, it can be achieved that left and right, front and back, upper and lower six orientation adjusting, guarantee optical fiber can be successfully received light beam；3, using card plug
The flame radical fluorescence intensity measurement device of Green's camera lens is, it can be achieved that " fixed point " of flame region free radical fluorescence intensity is surveyed
Amount, has further widened the test method of flame radical fluorescence intensity, has peomoted the research to flame characteristics；4, pass through
The optical filter of different-waveband in measuring device is replaced, it can be achieved that research to flame difference free radical group, enhances measuring device
The flexibility used.
Detailed description of the invention
Fig. 1 is Cassegrain's lens construction schematic diagram.
Fig. 2 is black box structural schematic diagram.
Fig. 3 is a kind of measuring device structural schematic diagram of flame radical fluorescence intensity.
Marked in the figure: 1, tested flame, 2, diaphragm, 3, Cassegrain's camera lens, 4, optical fiber, 5, collimating mirror, 6, optical filter, 7,
Black box, 8, pin, 9, induction form, 10, photomultiplier tube, 11, adapter, 12, data collector, 13, adjusting screw, 14,
Secondary mirror, 15, circumferential rib, 16, primary mirror, 17, lens barrel, 18, regulating member, 19, optical fiber joint end mouth, 20, with collimating mirror cooperate spiral shell
Line.
Specific embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings, but this should not be interpreted as to above-mentioned theme of the invention
Range be only limitted to above-described embodiment.
As shown in Figure 1, a kind of Cassegrain's camera lens 3 is made of primary mirror 16, secondary mirror 14 and lens barrel 17.Primary mirror 16 is curvature half
Diameter is the concave spherical mirror of r, and primary mirror center is provided with through-hole, and the scope control of r is between 300mm ~ 305mm.Secondary mirror 14 is song
Rate radius is the convex spherical reflecting mirror of 0.5r ~ 0.6r.Primary mirror 16 and secondary mirror 14 are coaxial, and the concave spherical surface of primary mirror 16 and secondary mirror 14
Convex spherical is opposite.Two mirrors distance is 0.45r ~ 0.55r, has an adjusting screw 13 on the fastener of fixed secondary mirror 14, passes through rotation
The distance between the fine-tuning primary mirror 16 of modulation section screw 13 and secondary mirror 14.Diaphragm 2 is located at the front end of lens barrel 17, anti-apart from secondary mirror 14
Face center 0.106r is penetrated, for controlling light-inletting quantity.The tail portion of lens barrel 17 has regulating member 18 and optical fiber joint end mouth 19.It adjusts
Section component 18 can realize the adjusting of left and right, front and back, upper and lower six orientation, so that the optical fiber 4 being connected at optical fiber joint end mouth 19
The light beam converged at herein can be successfully received.Lens imaging point is apart from 16 reflecting surface central point 1.233r of primary mirror.Lens barrel 17
Inner wall is equipped with a certain number of circumferential ribs 15 and improves the image quality of optical system for reducing the interference of inner wall reflected light.Rib
Between distance be d, the high 0.8d of rib, rib thickness 0.2d.Rib spacing d is controlled between 8mm ~ 13mm.
As shown in figure 3, a kind of measuring device of flame radical fluorescence intensity, including tested flame 1, Cassegrain's camera lens
3, optical fiber 4, collimating mirror 5, optical filter 6, black box 7, photomultiplier tube 10 and data collector 12.In the flame radical fluorescence
In the measuring device of intensity, above-mentioned Cassegrain's camera lens 3 has been used.Diaphragm 2 is arranged in 3 front end of Cassegrain's camera lens, for controlling
Light-inletting quantity processed.The incidence end of optical fiber 4 is connected with the optical fiber joint end mouth 19 of 3 tail portion of Cassegrain's camera lens.The exit end of optical fiber 4
It is connected with collimating mirror 5.The bayonet of optical filter 6 and collimating mirror 5 is arranged on the side wall surface of black box 7, and optical filter 6 passes through switching
First 11 are fixed, and collimating mirror 5 is screwed by screw thread 20 with adapter 11 and connect, as shown in Figure 2.Photomultiplier tube 10 is located at black
In case 7, for eliminating the interference of background light.Optical filter 6 is between collimating mirror 5 and photomultiplier tube 10.Photomultiplier tube
10 induction form 9 is towards 6 side of optical filter, with 6 place plane parallel of optical filter.For connecting on photomultiplier tube 10
The pin 8 for connecing output signal is located at the outside of black box 7, facilitates the connection of route.Respective lines and data collector in pin 8
12 are connected, and data collector 12 is used to show and handle the electric signal of the output of photomultiplier tube 10.
The light that flame 1 issues is injected from diaphragm 2, into Cassegrain's camera lens 3.Light is first reflected through primary mirror 16, is arrived
Up to secondary mirror 14, light beam is focused again and is passed through the through-hole at 16 center of primary mirror by secondary mirror 14, is imaged on the tail portion of Cassegrain's camera lens 3
At optical fiber joint end mouth 19.The through-hole diameter of primary mirror 16 requires to be greater than diameter of the focus on light beam at this plane.Focus on light beam
Angle requirement is less than the angle of divergence of optical fiber 4, and picture point diametric requirements are less than 4 core diameter of optical fiber, to ensure to utilize Cassegrain
The light that camera lens 3 acquires can fully enter optical fiber 4, make light from the trailer transmission of Cassegrain's camera lens 3 to optical fiber 4 through optical fiber 4
Exit end.The light beam projected from optical fiber 4 can be dissipated by the angle of its angle of divergence, it has not been convenient to the induction form of photomultiplier tube 10
9 receive.Collimating mirror 5 is connected to the exit end of optical fiber 4, the divergent beams projected from optical fiber 4 can be converted into diameter by collimating mirror 5
Collimated light beam within 4mm ~ 6mm, wherein the numerical aperture of optical fiber 4 and the numerical aperture of collimating mirror 5 match, and are
0.22.7 wall surface of black box is equipped with an adapter 11.Collimating mirror 5 is screwed by screw thread 20 with adapter 11 and is connect, optical filter 6
Between 7 wall surface of adapter 11 and black box, it is fixed by adapter 11.The collimated light beam projected from collimating mirror 5 is worn
Optical filter 6 is crossed, is filtered through optical filter 6.According to the wave band of optical filter 6 itself, the light projected from optical filter 6 be flame 1 certain
The light of one free radical.The collimated light beam projected through optical filter 6 is radiated on the induction form 9 of photomultiplier tube 10.Photoelectricity times
Increase pipe 10 by institute received light intensity signal be converted into electric signal through a certain circuit output in pin 8, and pass through connected line
Road is by the electric signal transmission to data collector 12.Data collector 12 is used to handling and showing the electricity that photomultiplier tube 10 exports
Signal.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (3)
1. a kind of for pinpointing the measuring device for capturing flame radical fluorescence intensity, including the transmission of light acquisition unit, light
Unit and photosensitive unit；It is characterized in that, the light acquisition unit is made of Cassegrain's camera lens；Light transmission unit includes
Optical fiber, collimating mirror and optical filter；Photosensitive unit includes black box, photomultiplier tube and data collector；Cassegrain's camera lens rear end
Equipped with optical fiber joint end mouth；The incidence end of optical fiber is connected with optical fiber joint end mouth, and the exit end of optical fiber is connected with collimating mirror；
The bayonet of optical filter and collimating mirror is arranged on the side wall surface of black box；Photomultiplier tube is located in black box, for eliminating background
The interference of light；Optical filter is between collimating mirror and photomultiplier tube；The induction form of photomultiplier tube is towards optical filter institute
In side, with plane parallel where optical filter；It is located at the outer of black box for connecting the pin of output signal on photomultiplier tube
Side facilitates the connection of route；Respective lines in pin are connected with data collector, and data collector is for showing and handling
The electric signal of photomultiplier tube output；
Cassegrain's camera lens includes primary mirror, secondary mirror and lens barrel, and the center of primary mirror is provided with through-hole, reflecting surface is concave surface；Secondary mirror
Reflecting surface be convex surface；For lens barrel for fixing primary mirror and secondary mirror, primary mirror and secondary mirror are coaxial, secondary mirror be located at primary mirror and tested flame it
Between, the concave surface of primary mirror and the convex surface of secondary mirror are opposite；The fastener of fixed secondary mirror, which is equipped with, adjusts screw, passes through turning adjusting screw
The distance between fine-tuning primary mirror and secondary mirror；Primary mirror radius of curvature is r, and through-hole diameter is 0.12r ~ 0.14r, secondary curvature radius
For 0.5r ~ 0.6r, the distance of primary mirror and secondary mirror is 0.45r ~ 0.55r, and diaphragm light passing diameter is 0.25r ~ 0.3r；The primary mirror
Radius of curvature r is 300mm ~ 305mm；
The optical fiber angle of divergence is greater than the angle of focus on light beam, numerical aperture 0.22, and core diameter is greater than picture point diameter, fibre core
Diameter is 960 μm, and fiber optic transmission wavelengths range is in 200nm ~ 1200nm；The number of the numerical aperture of the collimating mirror and the optical fiber
Value aperture matches, and collimating mirror numerical aperture is 0.22, and operating wavelength range is 200nm ~ 2000nm；The optical filter is according to institute
It surveys selected by free group, OH group chooses the optical filter of wave band 315nm ± 7.5nm, and CH group chooses wave band 427nm ± 5nm
Optical filter.
2. according to claim 1 a kind of for pinpointing the measuring device for capturing flame radical fluorescence intensity, feature
It is, the Cassegrain mirror tail end can realize front and back, upper and lower, left and right six direction fine tuning, wherein the tune of upper and lower left and right
Adjusting range is in ± 1mm.
3. according to claim 1 a kind of for pinpointing the measuring device for capturing flame radical fluorescence intensity, feature
It is, the lens barrel inner wall of Cassegrain's camera lens is equipped with for reducing the reflective circumferential rib of lens barrel inner wall, and each internal-rib is mutual
Parallel arrangement is simultaneously vertical with the axis of lens barrel；Intercostal distance is d, the high 0.8d of rib, rib thickness 0.2d；Rib spacing d control 8mm ~
Between 13mm.
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| CN201610007913.5A CN105651747B (en) | 2016-01-07 | 2016-01-07 | It is a kind of for pinpoint capture flame radical fluorescence intensity measuring device |
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| CN201610007913.5A CN105651747B (en) | 2016-01-07 | 2016-01-07 | It is a kind of for pinpoint capture flame radical fluorescence intensity measuring device |
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| CN106969267A (en) * | 2017-04-15 | 2017-07-21 | 广东蓝新氢能源科技有限公司 | A kind of efficient fire device |
| CN114323666A (en) * | 2021-12-31 | 2022-04-12 | 南京航空航天大学 | Ultraviolet light conduction device for detecting heat release rate of combustion chamber of aircraft engine |
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| JP2006292524A (en) * | 2005-04-08 | 2006-10-26 | Imagineering Kk | Ignition or discharge plug used in heat engine or plasma device and optical measuring instrument |
| CN101535797A (en) * | 2006-11-17 | 2009-09-16 | 创想科学技术工程株式会社 | Reaction analyzer, recording medium, measurement system, and control system |
| JP2010286487A (en) * | 2009-06-15 | 2010-12-24 | General Electric Co <Ge> | Optical sensor for controlling combustion |
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