CN114112040B - Continuous spectrum filtering spectral detection system based on narrow band pass filter - Google Patents
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- G—PHYSICS
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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
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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
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Abstract
The invention belongs to the technical field of photoelectric detection, and particularly relates to a continuous spectrum filtering spectral detection system based on a narrow-band pass filter. The invention 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 closely 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 the tail end wires of the four filtering systems are respectively connected into the current amplifier and the data acquisition and analysis system, so that the amplification, acquisition and processing of signals are realized. The invention can solve the problems of separation of various signal sources, interference elimination of strong signal sources and extraction of measurement signals with enough intensity, perfects and improves 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 spectral 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 ion temperature, increasing plasma energy storage and strengthening plasma confinement. In a plasma with neutral beam (deuterium) injection, 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 by exchanging charges with the neutral beam particles. The background ions become corona neutral particles after charge exchange with the neutral beam particles. In addition, cold neutrals are also present at the plasma edge. When the cold neutral particles are in an excited state, an energy state transition of n=3 to n=2 occurs, and a D-alpha line spectrum is emitted. Similarly, fast neutral particles will also emit D-alpha rays, but since fast neutral particles have a much higher velocity than cold neutral particles, the D-alpha rays will undergo Doppler shift and the spectrum received by the detector will become a continuous spectrum, i.e., the 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 the neutral beam injection with deuterium. The deuterium neutral beam is injected with 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 coulomb collisions of electrons with ions, i.e., bremsstrahlung spectrum (BREM spectrum). Of these continuous spectra, the FIDA spectrum is the weakest intensity spectrum, which is 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 spectrum signal, FIDA diagnostics on fusion devices are available. Under the condition that the neutral beam injection energy is not high enough (less than 45 keV), the FIDA spectrum region width is relatively narrow (less than 1 nm), and a plurality of other continuous spectrums exist at the same time, so that improvement and perfection of FIDA diagnosis are needed to solve the problem.
On the magnetic confinement fusion device, FIDA spectrum diagnosis based on spectrum splitting of a spectrometer is to split each wavelength component by utilizing a grating in the spectrometer, and a CCD camera is used for photoelectric conversion and data acquisition. FIDA spectrum diagnostics can obtain an efficient FIDA spectrum and arrange multi-point measurements within the plasma to obtain a spatial distribution of FIDA intensities, but with a time resolution on the order of 10 milliseconds. For FIDA signals in the more rapidly changing physics within fusion plasma, CCD detectors cannot achieve efficient detection due to insufficient photon capture and limited response speed. With the maturation of filter technology, the spectrum distinguishing light of Doppler frequency shift spectrum is carried out based on a multi-channel 1nm narrow-band pass filter, the gain detection is carried out by a photomultiplier, and the continuous spectrum light splitting detection system of channel difference is carried out by computer software, so that various signal sources can be effectively distinguished, the interference of strong signal sources is eliminated, and an effective FIDA signal is obtained. Moreover, by arranging a plurality of measuring points in the plasma, the detection system can obtain the spatial distribution of the FIDA intensity, and the time resolution can be improved to 100 microsecond magnitude (100 times of the FIDA spectrum diagnosis based on spectrometer light splitting), so that an important diagnosis basis is provided for the analysis of a 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 signals and high time resolution, and the development cost of the whole system is also low.
Therefore, it is desirable to provide a continuous spectrum filtering spectral detection system based on a narrowband pass filter to solve the problems in the prior art.
Disclosure of Invention
The invention aims to provide a continuous spectrum filtering spectral 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 measurement signals with sufficient strength, perfects and improves the FIDA diagnosis technology, and widens the application range of photomultiplier detection.
The invention adopts the technical scheme that:
a continuous spectrum filtering spectral 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 closely distributed at the end, the other end of the optical fiber bundle is divided into four filtering channels, the four filtering channels are respectively connected with the four filtering systems, and the tail end lines of the four filtering systems are respectively connected with the current amplifier and the data acquisition and analysis system, so that signal amplification, acquisition and processing are realized.
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 into a filtering system which is formed by connecting and combining an incident lens a, a narrow-band pass filter a and an emergent lens a, and the tail end of the emergent lens a is connected with an inlet hole of a photomultiplier a.
The narrow band pass filter a working interval is as follows: 659-660nm, which extracts 90% of the light signal, the collected signal contains: 2.7% BES, 27% HBES, 90% FIDA and BREM signals.
The second filter channel is connected into a filter system formed by connecting and combining an incident lens b, a combined attenuation sheet, a narrow-band pass filter sheet b and an emergent lens b, and the tail end of the emergent lens b is connected with an inlet of a photomultiplier b.
The working interval of the narrow band-pass filter b is as follows: 658-659nm, 90% of optical signals can be extracted, attenuation sheets are combined, the stop band range is 650-670nm, and the BES signals with 2.7% are obtained by connecting 10% of attenuation sheets and 30% of attenuation sheets in series.
The third filtering channel is connected into a filtering system which is formed by connecting and combining an incident lens c, an attenuation sheet, a narrow-band-pass filter sheet c and an emergent lens c, and the tail end of the emergent lens c is connected with an inlet of a photomultiplier c.
The working interval of the narrow band-pass filter c is as follows: 660-661nm, 90% of optical signals can be extracted, the attenuation sheet is used for stopping the band, the range is 650-670nm, the transmittance is 30%, and 27% of HBES signals are obtained.
The fourth filtering channel is connected to a filtering system formed by connecting an incident lens d, a narrow-band-pass filter d and an emergent lens d, and the tail end of the emergent lens d is connected with the inlet of the photomultiplier d.
The working interval of the narrow band-pass filter d is as follows: 661-662nm, 90% BREM signal is obtained.
Compared with the prior art, the invention has the beneficial effects that:
(1) The invention provides a continuous spectrum filtering spectral detection system based on a narrow-band pass filter, which adopts the combination of the narrow-band pass filters and attenuation sheets in different wavelength ranges to solve the problems of separation of various signal sources, interference elimination of strong signal sources and screening 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 a combination of a photomultiplier, a current amplifier and a data acquisition analyzer with a differential function to solve the problems of amplification, identification and complete extraction of effective measurement weak light signals.
(3) The invention provides a continuous spectrum filtering spectral 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 and amplification extraction of a weak light signal in a complex component continuous spectrum overlapping region, and has strong practicability and low cost compared with a spectrometer.
(4) The invention provides a continuous spectrum filtering spectral detection system based on a narrow-band pass filter, which solves the problem of high time resolution detection of signal space distribution under the condition of a plurality of interference sources in FIDA diagnosis on a fusion device and provides an important basis for experimental study of a physical fast process at the front edge.
Drawings
FIG. 1 is a schematic diagram of a continuous spectrum filtering spectral detection system based on a narrow band pass filter;
FIG. 2 is a graph of the corresponding bands and intensities of the emission spectra;
FIG. 3 shows the spectral components and signal intensities of the emission spectrum after passing through a filtering system arranged in accordance with the present invention;
in fig. 1: 1-a lens; 2-optical fiber bundles; 3-incidence lens a, 4-incidence lens b; 5-an entrance lens c; 6-an entrance lens d; 7-combining the attenuation sheets; 8-an attenuation sheet; a 9-narrow bandpass filter a; a 10-narrow bandpass filter b; 11-a narrow bandpass filter c; a 12-narrow bandpass filter d; 13-exit lens a, 14-exit lens b; 15-an exit lens c; 16-an exit lens d; 17-photomultiplier a; 18-photomultiplier b; 19-photomultiplier c; 20-photomultiplier d; a 21-current amplifier; 22-data acquisition analysis system.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific 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 explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
The invention provides a continuous spectrum filtering spectral detection system based on a narrow-band pass filter, which comprises three parts:
the first part, the collection and conduction of the target emission light in the plasma, mainly comprises an imaging lens group and an optical fiber, wherein the imaging lens group is arranged on the device;
the second part is used for extracting and photoelectrically converting and amplifying optical signals in different spectrum areas, and screening target signals is mainly completed by a narrow-band pass filter and an attenuation sheet, and a photomultiplier amplifies weak optical signals and converts the weak optical signals into electric signals;
and the third part is used for amplifying the electric signals, collecting and analyzing the data and acquiring the FIDA effective signals, and mainly comprises a current amplifier and a data collector, and the data needs to be subjected to differential operation through a control system.
In particular, the method comprises the steps of,
as shown in fig. 1, the continuous spectrum filtering spectroscopic detection system based on the narrowband pass filter provided by the invention comprises: a lens group 1, an optical fiber bundle 2, an incidence lens a3, an incidence lens b4, an incidence lens c5, an incidence lens 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, 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 closely 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 with a filtering system formed by connecting and combining an incident lens a3, a narrow-band pass filter a9 and an emergent lens a13, and the tail end of the emergent lens a13 is connected with an inlet of a photomultiplier a 17;
narrow band pass filter a9 working interval: 659-660nm, which extracts 90% of the light signal, the main collected signal contains: 2.7% BES, 27% HBES, 90% FIDA and BREM signals.
The second filter channel is connected with a filter system which is formed by connecting and combining an incident lens b4, a combined attenuation sheet 7, a narrow-band pass filter sheet b10 and an emergent lens b14, and the tail end of the emergent lens b14 is connected with an inlet of a photomultiplier b 18;
narrow band pass filter b10 working interval: 658-659nm, 90% of optical signals can be extracted, the attenuation sheet 7 is combined, the stop band range is 650-670nm, and the BES signals with 2.7% are mainly obtained by connecting 10% attenuation sheets and 30% attenuation sheets in series.
The third filtering channel is connected with a filtering system which is formed by connecting and combining an incident lens c5, an attenuation sheet 8, a narrow-band pass filter sheet c11 and an emergent lens c15, and the tail end of the emergent lens c15 is connected with an inlet of a photomultiplier c 19;
narrow band pass filter c11 working interval: 660-661nm, 90% of optical signals can be extracted, the attenuation sheet 8, the stop band range is 650-670nm, the transmittance is 30%, and 27% of HBES signals are mainly obtained.
The fourth filter channel is connected with a filter system which is formed by connecting and combining an incident lens d6, a narrow-band-pass filter d12 and an emergent lens d16, and the tail end of the emergent lens d16 is connected with an inlet of a photomultiplier d 20;
narrow band pass filter d12 working interval: 661-662nm, mainly 90% BREM signal.
And the tail end lines of the photomultiplier tubes of the four filtering 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 installed between the magneto-restrictive fusion device and the optical fiber bundle 2, and collects and images the light of the plasma target position.
As shown in fig. 1, single-point measurement is adopted for the plasma at the target position, light emitted by the plasma and imaged by the lens group 1 is respectively transmitted to 4 filtering channels through the optical fiber bundle 2, FIDA, BES, HBES, BREM spectrum signals are respectively obtained, the spectrum region and corresponding intensity of the original signals are shown in fig. 2, and in fig. 2, the spectrum region and the corresponding intensity are respectively BES spectrum, FIDA spectrum, HBES spectrum and BREM bremsstrahlung radiation from left to right.
As shown in fig. 1 and 3, the optical signal entering from the first fiber, after passing through the narrow band pass filter a9 (working interval: 659-660 nm), still leaves 2.7% BES, 27% HBES, 90% FIDA and BREM signals. The lens mainly focuses light in parallel, and the narrow-band pass filter can transmit 90% of signals.
The optical signal entering from the second optical fiber passes through the combined attenuation sheet 7 (attenuation of 90% and 70%) and the narrow-band pass filter b10 (working interval: 658-659 nm), and the BES signal intensity is 2.7% of the original BES signal intensity.
The optical signal entering the third optical fiber passes through an attenuation sheet 8 (70% attenuation) and a narrow-band pass filter c11 (90% transmission) (working interval: 660-661 nm), and the HBES signal intensity is 27% of the original signal intensity.
The light signal entering from the fourth optical fiber passes through a narrow-band pass filter d12 (working interval: 661-662 nm), and the BREM signal intensity is 90% of the original BREM signal intensity.
As shown in fig. 1, signals obtained by the 4 filtering channels respectively enter a 21 current amplifier to gain and amplify weak signals, and finally, a 22 data acquisition and analysis system is used for acquiring data and carrying out differential processing: s is S FIDA ＝S 1 -S 2 -S 3 -S 4 A target signal is obtained.
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 characteristics 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 disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (1)
1. A continuous spectrum filtering spectral detection system based on a narrow band pass filter is characterized in that: the optical fiber 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 closely distributed at the end, the other end of the optical fiber bundle (2) is divided into four filtering channels, the four filtering channels are respectively connected with the four filtering systems, and the tail end wires of the four filtering systems are respectively connected with the current amplifier (21) and the data acquisition and analysis system (22) to amplify, acquire and process signals;
the lens group (1) is arranged between the magnetic confinement fusion device and the optical fiber bundle (2) and used for collecting and imaging light at a plasma target position;
the first filtering channel is connected with a filtering system formed by connecting and combining an incident lens a (3), a narrow-band pass filter a (9) and an emergent lens a (13), and the tail end of the emergent lens a (13) is connected with an inlet of a photomultiplier a (17);
the narrow band pass filter a (9) is in a working range: 659-660nm, which extracts 90% of the light signal, the collected signal contains: 2.7% doppler shifted beam emission spectrum, 27% hydrogen beam emission spectrum, 90% FIDA and bremsstrahlung spectrum signals;
the second filter channel is connected with a filter system which is formed by connecting and combining an incident lens b (4), a combined attenuation sheet (7), a narrow-band pass filter sheet b (10) and an emergent lens b (14), and the tail end of the emergent lens b (14) is connected with an inlet of a photomultiplier b (18);
the narrow band-pass filter b (10) is in a working range: 658-659nm, 90% of optical signals can be extracted, attenuation sheets (7) are combined, the stop band range is 650-670nm, and the Doppler frequency shift beam emission spectrum signals with 2.7% are obtained by connecting 10% attenuation sheets and 30% attenuation sheets in series;
the third filtering channel is connected with a filtering system which is formed by connecting and combining an incident lens c (5), an attenuation sheet (8), a narrow-band pass filter sheet c (11) and an emergent lens c (15), and the tail end of the emergent lens c (15) is connected with an inlet of a photomultiplier c (19);
the narrow band-pass filter c (11) is in a working range: 660-661nm, 90% of optical signals can be extracted, an attenuation sheet (8) is arranged in a stop band range of 650-670nm, and the transmittance is 30%, so that 27% of hydrogen beam emission spectrum signals are obtained;
the fourth filter channel is connected with a filter system which is formed by connecting and combining an incidence lens d (6), a narrow-band pass filter d (12) and an emergent lens d (16), and the tail end of the emergent lens d (16) is connected with an inlet of a photomultiplier d (20);
the narrow band pass filter d (12) is in a working range: 661-662nm to obtain 90% of bremsstrahlung spectrum signals.
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