CN114112040A - Continuous spectrum filtering and light splitting detection system based on narrow band pass filter - Google Patents
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- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
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Abstract
The invention belongs to the technical field of photoelectric detection, and particularly relates to a continuous spectrum filtering and light splitting detection system based on a narrow band-pass filter. The optical fiber signal acquisition and analysis system comprises a lens group, an optical fiber bundle, a filtering system, a current amplifier and a data acquisition and analysis system, wherein the lens group is connected with one end of the optical fiber bundle, the optical fiber bundle is densely arranged at the end, the other end of the optical fiber bundle is divided into four filtering channels, the four filtering channels are respectively connected into the four filtering systems, and tail end lines of the four filtering systems are respectively connected into the current amplifier and the data acquisition and analysis system to realize signal amplification, acquisition and processing. The invention can solve the separation of various signal sources, the interference elimination of strong signal sources and the extraction of sufficient intensity measurement signals, perfects and promotes the FIDA diagnosis technology, and widens the application range of photomultiplier detection.
Description
Technical Field
The invention belongs to the technical field of photoelectric detection, and particularly relates to a continuous spectrum filtering and light splitting detection system based on a narrow band-pass filter.
Background
In the magnetic confinement fusion experiment, neutral beam injection is an important heating means for increasing the ion temperature, increasing the plasma energy storage and strengthening the plasma confinement. In plasmas with neutral beam (deuterium) implantation, high energy particles, i.e., neutral beam particles, are generated. When neutral beam particles interact with electrons and ions, fast ions are generated in the plasma, and the fast ions are changed into fast neutral particles after charge exchange with the neutral beam particles. The background ions become hot-halo neutral particles after charge exchange with the neutral beam particles. In addition, there are also cold neutrals at the plasma edge. When the cold neutral particles are in an excited state, energy state transition from n-3 to n-2 occurs, and a D-alpha line spectrum is emitted. Similarly, fast neutrals also emit D-alpha light, but because they have a much higher velocity than cold neutrals, the D-alpha line is Doppler shifted and the spectrum received by the detector becomes a continuum, i.e., a FIDA spectrum. Neutral beam particles also have ultra-high velocities, which produce a doppler shifted beam emission spectrum (BES spectrum). The beam emission spectrum is also called deuterium beam emission spectrum due to injection with deuterium neutral beam. Deuterium neutral beam injection introduces a small amount of hydrogen neutral beam particles, which is called the hydrogen beam emission spectrum (HBES spectrum). Also, there is a widely existing continuum in the plasma, which results from coulombic collisions of electrons with ions, the BREM spectrum. Of these continuum spectra, the FIDA spectrum is the weakest intensity spectrum, comparable to the BREM spectrum in intensity, about 10 times smaller than the HBES spectrum, and about 1000 times smaller than the BES spectrum. To eliminate these disturbances and detect a valid FIDA spectral signal, there is a FIDA diagnosis on the fusion device. When the implantation energy of the neutral beam is not high enough (less than 45keV), the width of the FIDA spectral region is narrow (less than 1nm), and other multiple continuous spectrums often exist simultaneously.
In the magnetic confinement fusion device, the FIDA spectrum diagnosis based on spectrometer light splitting is to split light of each wavelength component by using a grating in a spectrometer, and a CCD camera is used for photoelectric conversion and data acquisition. FIDA spectroscopy enables efficient FIDA spectroscopy and the arrangement of multiple measurements within the plasma results in a spatial distribution of FIDA intensity, but with temporal resolution on the order of 10 milliseconds. For FIDA signals in a fusion plasma in a more rapid physical process, the CCD detector cannot achieve effective detection because it cannot capture enough photons and response speed is limited. With the maturity of the filter technology, based on the spectrum division light of the multi-channel 1nm narrow band pass filter, the photomultiplier carries out gain detection, and computer software carries out the continuous spectrum light division detection system of channel difference, can effectively distinguish various signal sources, gets rid of the interference of strong signal source, obtains effectual FIDA signal. In addition, by arranging a plurality of measuring points in the plasma, the detection system can obtain the spatial distribution of the FIDA intensity, the time resolution can be improved to 100 microseconds (100 times of the FIDA spectrum diagnosis based on spectrometer light splitting), and an important diagnosis basis is provided for the analysis of the fast physical process in the plasma. Compared with FIDA spectrum diagnosis based on spectrometer light splitting, the detection system has the advantages of strong detection signal, high time resolution and much lower whole system development cost.
Therefore, it is desirable to provide a continuous spectrum filtering spectroscopic detection system based on a narrow band pass filter to solve the problems of the prior art.
Disclosure of Invention
The invention aims to provide a continuous spectrum filtering light splitting detection system based on a narrow band pass filter, which solves the problems of separation of various signal sources, interference elimination of strong signal sources and extraction of sufficient intensity measurement signals, perfects and improves the FIDA diagnosis technology, and widens the application range of photomultiplier detection.
The technical scheme adopted by the invention is as follows:
a continuous spectrum filtering and light splitting detection system based on a narrow band pass filter comprises a lens group, an optical fiber bundle, a filtering system, a current amplifier and a data acquisition and analysis system, wherein the lens group is connected with one end of the optical fiber bundle, the optical fiber bundle is densely arranged at the end, the other end of the optical fiber bundle is equally divided into four filtering channels, the four filtering channels are respectively connected into the four filtering systems, and tail end lines of the four filtering systems are respectively connected into the current amplifier and the data acquisition and analysis system to realize signal amplification, acquisition and processing.
The lens group is arranged between the magnetic confinement fusion device and the optical fiber bundle, and is used for collecting and imaging light at a plasma target position.
The first filtering channel is connected to a filtering system formed by connecting and combining an incident lens a, a narrow band-pass filter a and an exit lens a, and the tail end of the exit lens a is connected with an inlet hole of a photomultiplier tube a.
The narrow band-pass filter a working interval: 659 and 660nm, 90% of optical signals are extracted, and the collected signals comprise: 2.7% BES, 27% HBES, 90% FIDA and BREM signals.
And the second filtering channel is connected into a filtering system formed by connecting and combining an incident lens b, a combined attenuation sheet, a narrow band-pass filter b and an exit lens b, and the tail end of the exit lens b is connected with an inlet hole of a photomultiplier tube b.
The narrow band-pass filter b working interval: 658- & gt 659nm extracts 90% of the optical signal, and combines with the attenuation sheet, the stop band range 650- & gt 670nm, which is formed by connecting 10% and 30% attenuation sheets in series, and obtains 2.7% of BES signal.
And the third filtering channel is connected with a filtering system formed by connecting and combining an incident lens c, an attenuation sheet, a narrow band-pass filter c and an exit lens c, and the tail end of the exit lens c is connected with an inlet hole of a photomultiplier tube c.
The working interval of the narrow band-pass filter is as follows: 660-661nm, 90% of the optical signal is extracted, the attenuation sheet, the stop band range 650-670nm, the transmittance 30%, and 27% of the HBES signal is obtained.
And the fourth filtering channel is connected into a filtering system formed by connecting and combining an incident lens d, a narrow band-pass filter d and an exit lens d, and the tail end of the exit lens d is connected with an inlet hole of a photomultiplier tube d.
Work interval of the narrow band-pass filter: 661-662nm, 90% of the BREM signal was obtained.
Compared with the prior art, the invention has the beneficial effects that:
(1) the invention provides a continuous spectrum filtering and light-splitting detection system based on a narrow band-pass filter, which adopts the combination of the narrow band-pass filter and an attenuation sheet in different wavelength ranges to solve the separation of various signal sources, the interference elimination of strong signal sources and the discrimination of effective measurement signals.
(2) The invention provides a continuous spectrum filtering light-splitting detection system based on a narrow band-pass filter, which adopts the combination of a photomultiplier, a current amplifier and a data acquisition analyzer with a difference function to solve the problems of amplification identification and complete extraction of effectively measured weak light signals.
(3) The invention provides a continuous spectrum filtering light-splitting detection system based on a narrow band-pass filter, which adopts a 1nm customized filter, a universal photomultiplier and a differential analysis technology to realize the identification, amplification and extraction of a complex component continuous spectrum overlapping region and a weak light signal.
(4) The invention provides a continuous spectrum filtering and light splitting detection system based on a narrow band pass filter, solves the problem of high time resolution detection of signal space distribution under the condition that FIDA diagnosis on a fusion device has a plurality of interference sources, and provides an important basis for experimental research of a front-edge physical fast process.
Drawings
Fig. 1 is a schematic structural view of a continuous spectrum filtering and spectroscopic detection system based on a narrow band-pass filter according to the present invention;
FIG. 2 shows the wavelength band and intensity of the emission spectrum;
FIG. 3 shows the corresponding spectral content and signal strength of an emission spectrum after passing through a filtering system according to the present invention;
in fig. 1: 1-a lens; 2-a fiber bundle; 3-incident lens a, 4-incident lens b; 5-an incident lens c; 6-incident lens d; 7-a combination attenuator; 8-an attenuation sheet; 9-narrow band pass filter a; 10-narrow bandpass filter b; 11-narrow bandpass filter c; 12-narrow bandpass filter d; 13-exit lens a, 14-exit lens b; 15-exit lens c; 16-an exit lens d; 17-photomultiplier tube a; 18-photomultiplier b; 19-photomultiplier tube c; 20-photomultiplier tube d; 21-a current amplifier; 22-data acquisition and analysis system.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The invention provides a continuous spectrum filtering and light-splitting detection system based on a narrow band-pass filter, which comprises three parts:
the first part is used for collecting and conducting target emission light in plasma and mainly comprises an imaging lens group and an optical fiber which are arranged in the device;
the second part is used for extracting optical signals in different spectral regions and carrying out photoelectric conversion and amplification, the narrow band-pass filter and the attenuator are mainly used for screening target signals, and the photomultiplier is used for amplifying weak optical signals and converting the weak optical signals into electric signals;
and the third part is used for amplifying the electric signal, acquiring and analyzing data and acquiring an FIDA effective signal, mainly comprises a current amplifier and a data acquisition unit, and needs to perform differential operation on the data through a control system.
In particular, the method comprises the following steps of,
as shown in fig. 1, the continuous spectrum filtering light splitting detection system based on a narrow band pass filter provided by the present invention includes: a lens group 1, an optical fiber bundle 2, an incident lens a3, an incident lens b4, an incident lens c5, an incident transmission d6, a combined attenuation sheet 7, an attenuation sheet 8, a narrow band pass filter a9, a narrow band pass filter b10, a narrow band pass filter c11, a narrow band pass filter d12, an exit lens a13, an exit lens b14, an exit lens c15, an exit lens d16, a photomultiplier a17, a photomultiplier b18, a photomultiplier c19, a photomultiplier d20, a current amplifier 21 and a data acquisition and analysis system 22,
the lens group 1 is connected with one end of the optical fiber bundle 2, the optical fiber bundle 2 is densely arranged at the end, and the other end of the optical fiber bundle 2 is divided into 4 filtering channels.
The first filtering channel is connected into a filtering system formed by connecting and combining an incident lens a3, a narrow band pass filter a9 and an exit lens a13, and the tail end of the exit lens a13 is connected with an inlet hole of a photomultiplier tube a 17;
narrow band-pass filter a9 operating interval: 659-660nm, 90% of the optical signal is extracted, and the main collected signals include: 2.7% BES, 27% HBES, 90% FIDA and BREM signals.
The second filtering channel is connected into a filtering system which is formed by connecting and combining an incident lens b4, a combined attenuation sheet 7, a narrow band-pass filter b10 and an exit lens b14, and the tail end of the exit lens b14 is connected with an inlet hole of a photomultiplier tube b 18;
narrow band-pass filter b10 operating interval: 658-.
The third filtering channel is connected into a filtering system formed by connecting and combining an incident lens c5, an attenuation sheet 8, a narrow band-pass filter c11 and an exit lens c15, and the tail end of the exit lens c15 is connected with an inlet hole of a photomultiplier tube c 19;
narrow band pass filter c11 operating interval: 660-661nm, 90% of the optical signal is extracted, the attenuation sheet 8, the stop band range 650-670nm, the transmittance 30%, and the HBES signal of 27% is mainly obtained.
The fourth filtering channel is connected into a filtering system formed by connecting and combining an incident lens d6, a narrow band-pass filter d12 and an exit lens d16, and the tail end of the exit lens d16 is connected with an inlet hole of a photomultiplier tube d 20;
narrow band-pass filter d12 operating interval: 661-662nm, mainly 90% of the BREM signal was obtained.
The tail end lines of the photomultiplier tubes of the four filter systems are respectively connected with a 21 current amplifier and a 22 data acquisition and analysis system, so that the amplification, acquisition and processing of signals are realized.
The lens group 1 is arranged between the magnetic confinement fusion device and the optical fiber bundle 2, and is used for collecting and imaging light at a plasma target position.
As shown in fig. 1, the plasma at the target position is measured by a single point, light emitted by the plasma and imaged by the lens group 1 is transmitted to 4 filter channels through the optical fiber bundle 2, FIDA, BES, HBES, and BREM spectrum signals are obtained respectively, the spectrum region where the original signal is located and the corresponding intensity are shown in fig. 2, and in fig. 2, from left to right, the BES spectrum, FIDA spectrum, HBES spectrum, and BREM radiation are shown respectively.
As shown in FIG. 1 and FIG. 3, after the optical signal entering from the first optical fiber passes through the narrow band-pass filter a9 (working region: 659-660nm), 2.7% BES, 27% HBES, and 90% FIDA and BREM signals remain. Wherein the lens mainly parallels and focuses light, and the narrow band-pass filter plate can transmit 90% of signals.
The intensity of the BES signal of the optical signal entering the second optical fiber is 2.7% of the original intensity after passing through the combined attenuator 7 (attenuation of 90% and 70%) and the narrow band-pass filter b10 (working interval: 658- & gt 659 nm).
After the optical signal entering the third optical fiber passes through the attenuator 8 (70% attenuation) and the narrow band-pass filter c11 (90% transmission) (working interval: 660-661nm), the HBES signal intensity is 27% of the original HBES signal intensity.
After the optical signal entering the fourth optical fiber passes through the narrow band-pass filter d12 (working interval: 661- & 662nm), the BREM signal intensity is 90% of the original intensity.
As shown in fig. 1, signals obtained from 4 filtering channels enter 21 current amplifiers respectively to gain and amplify weak signals, and finally, a 22 data acquisition and analysis system is used to acquire and analyze dataPerforming difference processing: sFIDA＝S1-S2-S3-S4And obtaining a target signal.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (10)
1. A continuous spectrum filtering light splitting detection system based on a narrow band pass filter is characterized in that: the optical fiber bundle-based signal amplification and analysis system comprises a lens group (1), an optical fiber bundle (2), a filtering system, a current amplifier (21) and a data acquisition and analysis system (22), wherein the lens group (1) is connected with one end of the optical fiber bundle (2), the optical fiber bundle (2) is densely arranged at the end, the other end of the optical fiber bundle (2) is equally divided into four filtering channels, the four filtering channels are respectively connected into the four filtering systems, and tail end lines of the four filtering systems are respectively connected into the current amplifier (21) and the data acquisition and analysis system (22) to realize signal amplification, acquisition and processing.
2. The system according to claim 1, wherein the system comprises: the lens group (1) is arranged between the magnetic confinement fusion device and the optical fiber bundle (2) and is used for collecting and imaging light at a plasma target position.
3. The system according to claim 1, wherein the system comprises: the first filtering channel is connected into a filtering system formed by connecting and combining an incident lens a (3), a narrow band-pass filter a (9) and an exit lens a (13), and the tail end of the exit lens a (13) is connected with an inlet hole of a photomultiplier a (17).
4. The system according to claim 3, wherein said system comprises: the working interval of the narrow band-pass filter a (9): 659 and 660nm, 90% of optical signals are extracted, and the collected signals comprise: 2.7% BES, 27% HBES, 90% FIDA and BREM signals.
5. The system according to claim 1, wherein the system comprises: and the second filtering channel is connected into a filtering system which is formed by connecting and combining an incident lens b (4), a combined attenuation sheet (7), a narrow band-pass filter b (10) and an exit lens b (14), and the tail end of the exit lens b (14) is connected with an inlet hole of a photomultiplier b (18).
6. The system according to claim 5, wherein said system comprises: the working interval of the narrow band-pass filter b (10): 658-.
7. The system according to claim 1, wherein the system comprises: and the third filtering channel is connected into a filtering system formed by connecting and combining an incident lens c (5), an attenuation sheet (8), a narrow band-pass filter c (11) and an exit lens c (15), and the tail end of the exit lens c (15) is connected with an inlet hole of a photomultiplier tube c (19).
8. The system according to claim 7, wherein said system comprises: the working interval of the narrow band-pass filter c (11): 660-661nm, 90% of the optical signal is extracted, the attenuation sheet (8), the stop band range is 650-670nm, the transmittance is 30%, and 27% of the HBES signal is obtained.
9. The system according to claim 1, wherein the system comprises: and the fourth filtering channel is connected into a filtering system formed by connecting and combining an incident lens d (6), a narrow band-pass filter d (12) and an exit lens d (16), and the tail end of the exit lens d (16) is connected with an inlet hole of a photomultiplier tube d (20).
10. The system according to claim 9, wherein the spectral filter is a continuous spectrum filter based on a narrow bandpass filter, and the system comprises: the working interval of the narrow band-pass filter d (12): 661-662nm, 90% of the BREM signal was obtained.
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| CN101504314A (en) * | 2009-03-24 | 2009-08-12 | 南京信息工程大学 | Atmosphere ultraviolet radiation flux measuring apparatus and method |
| CN103995047A (en) * | 2014-03-22 | 2014-08-20 | 中国科学院等离子体物理研究所 | Optical mass spectrometer diagnosis technology for distinguishing helium and deuterium in Tokamak residual gas by using penning discharge |
| CN110132907A (en) * | 2018-02-09 | 2019-08-16 | 杨佳苗 | Fiber optic conduction multi-detector discrete spectrum and fluorescence lifetime detection method and sensor |
| CN109141637A (en) * | 2018-07-03 | 2019-01-04 | 西北核技术研究所 | A kind of CARS signal detection system dynamic range enhancement device |
| CN109696409A (en) * | 2019-01-31 | 2019-04-30 | 中国海洋石油集团有限公司 | A kind of spectral scan probe |
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| CN117423600A (en) * | 2023-12-19 | 2024-01-19 | 哈尔滨工业大学 | Fluorocarbon plasma group space distribution monitoring device and method |
| CN117423600B (en) * | 2023-12-19 | 2024-04-23 | 哈尔滨工业大学 | Fluorocarbon plasma group space distribution monitoring device and method |
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