CN107228830A - A kind of optical monitoring system of electric thruster hollow cathode corrosion product - Google Patents
A kind of optical monitoring system of electric thruster hollow cathode corrosion product Download PDFInfo
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- CN107228830A CN107228830A CN201710415091.9A CN201710415091A CN107228830A CN 107228830 A CN107228830 A CN 107228830A CN 201710415091 A CN201710415091 A CN 201710415091A CN 107228830 A CN107228830 A CN 107228830A
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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
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/27—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands using photo-electric detection ; circuits for computing concentration
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Abstract
A kind of optical monitoring system of electric thruster hollow cathode corrosion product, belongs to spaceflight apparatus field.In order to meet the monitoring requirements of electric thruster hollow cathode corrosion product.The narrow-band interference filter plate array of the present invention is towards plume area, plume area radiant light is incident to fiber array module after narrow-band interference filtering chip arrays filtering, narrow-band interference filtering chip arrays include multiple narrow-band interference filter plates, fiber array module includes multifiber, the incidence end of multifiber is corresponded with multiple narrow-band interference filter plates, photomultiplier tube array includes multiple photomultipliers, the light of multifiber outgoing is incident to the optical signal receiving terminal of multiple photomultipliers respectively, multiple passages of the time-gated counter of multichannel are counted to the electric signal of multiple photomultipliers respectively, high voltage power supply is used to power for photomultiplier tube array.The present invention is applied to monitoring hollow cathode corrosion product.
Description
Technical field
The invention belongs to spaceflight apparatus field, and in particular to it is fixed in real time that hollow cathode corrosion product in electric thruster is carried out
Property and the optical inspection techniques of quantitative analysis.
Background technology
Electric thruster includes hall thruster and ion thruster, and hollow cathode is hall thruster and ion thruster
Core component, hollow cathode produces electronics and propellant is ionized and plume is neutralized.The life-span of hollow cathode determines entirely
The reliability of system, the monitoring in real time to hollow cathode corrosion product and corrosion rate is most important.
Hollow cathode plume area is low temperature plasma, and main component is propellant constituent Xe or Kr and corrosion product
Boron, lanthanum, tungsten, tantalum, barium, molybdenum.The emission spectrum wave-length coverage of corrosion product falls in Uv and visible light section.Xe or Kr in plume area
It is main component, the corrosion product content of carrying is less, and the spectral line of corrosion product is weaker compared to propellant the intensity of spectral line.It is hollow
The unstability of cathodic discharge causes plume area to be fluctuated, and then plume ion plasma emission spectrum is non-constant.Summary reason,
The spectral measurement difficulty of corrosion product is larger, in order to realize that the real-time measurement to corrosion product spectrum needs system quickly to gather
Spectrum, while having high sensitivity and big measurable dynamic range.
The content of the invention
The invention aims to meet the monitoring requirements of electric thruster hollow cathode corrosion product, so as to provide one kind
The optical monitoring system of electric thruster hollow cathode corrosion product.
A kind of optical monitoring system of electric thruster hollow cathode corrosion product of the present invention, including narrow-band interference filter
Wave plate array, fiber array module, photomultiplier tube array, the time-gated counter of multichannel and high voltage power supply；
Narrow-band interference filter plate array enters towards plume area, plume area radiant light after being filtered through narrow-band interference filtering chip arrays
Fiber array module is incident upon, narrow-band interference filtering chip arrays include multiple narrow-band interference filter plates, and fiber array module includes many
Root optical fiber, the incidence end of multifiber is corresponded with multiple narrow-band interference filter plates, and photomultiplier tube array includes multiple light
Electric multiplier tube, the light of multifiber outgoing is incident to the optical signal receiving terminal of multiple photomultipliers, multichannel time gate respectively
Multiple passages of control counter are counted to the electric signal of multiple photomultipliers respectively；High voltage power supply is used to be photomultiplier transit
Pipe powering arrays.
Preferably, the narrow-band interference filtering chip arrays include 6 narrow-band interference filter plates.
Preferably, in addition to temperature control modules, temperature control modules are used to make photomultiplier tube array be maintained at permanent
Fixed temperature.
The optical monitoring system of the present invention has high sensitivity and high time resolution ability simultaneously, and time resolution can
5ns is reached, the corrosion product concentration (i.e. density content of the corrosion product in working gas) that can be measured can be with as little as 1ppm
(hundred a ten thousandths), and measurable spectral dynamic range (ratio for the most strong and most weak light intensity that can be measured) can be up to
6 orders of magnitude, available for gathering, most of element in faint quick change and unduplicated spectral signal, system is external to true
Outside slack tank, the corrosion product information of negative electrode can quickly, be non-contactly obtained.
Brief description of the drawings
Fig. 1 is a kind of optical monitoring system of electric thruster hollow cathode corrosion product described in embodiment one
Structural representation；
Fig. 2 is the cross-sectional view of the radiant light arrival end of the fiber array module in embodiment one；
Fig. 3 is the cross-sectional view of the radiant light port of export of the fiber array module in embodiment one；
Fig. 4 is the structural representation that narrow-band interference in embodiment one filters chip arrays；
Fig. 5 is the schematic diagram of the photomultiplier tube array in embodiment one.
Embodiment
Embodiment one：Present embodiment is illustrated with reference to Fig. 1 to Fig. 5, one kind electricity described in present embodiment
The optical monitoring system of thruster hollow cathode corrosion product, including narrow-band interference filtering chip arrays 10, fiber array module 20,
The time-gated counter 40 of photomultiplier tube array 30, multichannel and high voltage power supply 50；
Narrow-band interference filters chip arrays 10 towards plume area, and plume area radiant light is filtered through narrow-band interference filtering chip arrays 10
After be incident to fiber array module 20, narrow-band interference filtering chip arrays 10 include multiple narrow-band interference filter plates, fiber array mould
Block 20 includes multifiber, and the incidence end of multifiber is corresponded with multiple narrow-band interference filter plates, photomultiplier tube array
30 include multiple photomultipliers, and the light of multifiber outgoing is incident to the optical signal receiving terminal of multiple photomultipliers respectively,
Multiple passages of the time-gated counter 40 of multichannel are counted to the electric signal of multiple photomultipliers respectively；High voltage power supply
50 are used to power for photomultiplier tube array 30.
Continuing to develop and being monitored using the corrosion product to hollow cathode for spectral analysis technique provides a kind of feasible way
Footpath, present embodiment uses spectral analysis technique.
Hollow cathode is operated in vacuum tank, built in measuring apparatus, element be vulnerable to plasma bombardment corrosion failure its
Sensitivity, if by the external radiant light of equipment by vacuum tank sight glass when can be interfered, cause the deviation of measurement result.
The direct narrow-band interference filtering chip arrays 10 for receiving radiant light need to be only placed in present embodiment in vacuum tank.
S is plume area in Fig. 1.Interference filter element provided with a transmission specific wavelength at every fiber entrance, certain wave
Depending on launch wavelength of the long waveband selection according to the corrosion product carried secretly in plume area.Multifiber collects transmission different wave length
Monochromatic light, the light of optical fiber other end outgoing is incident to multiple photomultipliers of photomultiplier tube array 30 respectively, thus
The radiant light that each narrow-band interference filter plate can be collected into specific wavelength passes to photomultiplier by optical fiber.Multichannel
Time-gated counter 40 is electrically connected with multiple photomultipliers 30 so that the system has the information gathering and analysis of nanosecond
Speed.Single channel counter can only realize the collection of photoelectric current analog signal, and can be realized with the time-gated counter of multichannel
Data signal photon counting mode, its sensitivity is much higher.
The course of work of optical monitoring system is：Narrow-band interference filtering chip arrays 10 are irradiated by light source, and each arrowband is done
Relate to the radiant light that every optical fiber in the radiant light that filter plate obtains particular etch product, fiber array 20 collects specific wavelength.
Every optical fiber connects different photomultipliers and the spectral signal of different wave length is transferred to different photomultipliers, one respectively
A kind of corrosion product of photomultiplier correspondence, the spectrum for obtaining a variety of corrosion products by the time-gated counter 40 of multichannel is believed
Breath.So as to obtain the information such as corrosion product type, the formation speed of all types of corrosion products.
Corrosion product is measured using mass spectrograph, it is impossible to realize monitoring, and mass spectrometric time resolution energy in real time
Power is μ s magnitudes, the corrosion product concentration that can be measured can only as little as thousand/, the measurable spectral dynamic range of light is only 3
The individual order of magnitude.
Embodiment two：Present embodiment is rotten to the kind electric thruster hollow cathode described in embodiment one
The optical monitoring system of erosion product is described further, in present embodiment, and the narrow-band interference filtering chip arrays 10 include 6
Narrow-band interference filter plate.
The main corrosion product of hollow cathode be boron, lanthanum, tungsten, tantalum, barium, molybdenum, its corresponding wavelength be respectively 249nm,
392nm、400nm、271nm、253nm、313nm.Therefore the main corruption that 6 independent light paths of use just can be to completion hollow cathode
Lose the measurement of product.
Embodiment three：Present embodiment is to hollow the moon of kind electric thruster described in embodiment one or two
The optical monitoring system of pole corrosion product is described further, in present embodiment, in addition to temperature control modules 60, temperature control
Molding block 60 is used to make photomultiplier tube array 30 be maintained at stationary temperature.
Temperature control modules 60 are used to photomultiplier tube array be maintained to constant low temperature ring when carrying out spectral measurement
Border, so as to eliminate influence of the temperature to photomultiplier tube array 30, improves the precision and reliability of measurement.
It is obvious to a person skilled in the art that the invention is not restricted to the details of above-mentioned one exemplary embodiment, Er Qie
In the case of without departing substantially from spirit or essential attributes of the invention, the present invention can be realized in other specific forms.Therefore, no matter
From the point of view of which point, embodiment all should be regarded as exemplary, and be nonrestrictive, the scope of the present invention is by appended power
Profit is required rather than described above is limited, it is intended that all in the implication and scope of the equivalency of claim by falling
Change is included in the present invention.
Claims (3)
1. a kind of optical monitoring system of electric thruster hollow cathode corrosion product, it is characterised in that including narrow-band interference filtering
Chip arrays (10), fiber array module (20), photomultiplier tube array (30), the time-gated counter of multichannel (40) and high pressure
Power supply (50)；
Narrow-band interference filtering chip arrays (10) filter chip arrays (10) through narrow-band interference and filtered towards plume area, plume area radiant light
After be incident to fiber array module (20), narrow-band interference filtering chip arrays (10) include multiple narrow-band interference filter plates, optical fiber array
Row module (20) includes multifiber, and the incidence end of multifiber is corresponded with multiple narrow-band interference filter plates, photomultiplier transit
Pipe array (30) includes multiple photomultipliers, and the light of multifiber outgoing is incident to the optical signal of multiple photomultipliers respectively
Receiving terminal, multiple passages of the time-gated counter of multichannel (40) are counted to the electric signal of multiple photomultipliers respectively
Number；High voltage power supply (50) is used for for photomultiplier tube array (30) power supply.
2. a kind of optical monitoring system of electric thruster hollow cathode corrosion product according to claim 1, its feature exists
In the narrow-band interference filtering chip arrays (10) include 6 narrow-band interference filter plates.
3. a kind of optical monitoring system of electric thruster hollow cathode corrosion product according to claim 1 or 2, its feature
It is, in addition to temperature control modules (60), temperature control modules (60) are for making photomultiplier tube array (30) be maintained at permanent
Fixed temperature.
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| CN201710415091.9A CN107228830A (en) | 2017-06-05 | 2017-06-05 | A kind of optical monitoring system of electric thruster hollow cathode corrosion product |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109141628A (en) * | 2018-06-14 | 2019-01-04 | 上海卫星工程研究所 | A kind of spaceborne optical fiber focus planar detector device |
| CN117420102A (en) * | 2023-12-19 | 2024-01-19 | 哈尔滨工业大学 | Optical on-line monitoring device and emitter life rapid assessment method |
| CN117425260A (en) * | 2023-12-19 | 2024-01-19 | 哈尔滨工业大学 | Spectrum monitoring method for plasma propeller plume excited state ion velocity distribution |
| CN117420083A (en) * | 2023-12-19 | 2024-01-19 | 哈尔滨工业大学 | Online monitoring device and method for trace products of plasma erosion |
| CN118067395A (en) * | 2024-04-19 | 2024-05-24 | 哈尔滨工业大学 | On-orbit multichannel optical imaging monitoring system and method for far-field plume weak light zone |
| CN118090517A (en) * | 2024-04-19 | 2024-05-28 | 哈尔滨工业大学 | Optical monitoring method for corrosion products on wall surface of Hall thruster channel |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109141628A (en) * | 2018-06-14 | 2019-01-04 | 上海卫星工程研究所 | A kind of spaceborne optical fiber focus planar detector device |
| CN117420102A (en) * | 2023-12-19 | 2024-01-19 | 哈尔滨工业大学 | Optical on-line monitoring device and emitter life rapid assessment method |
| CN117425260A (en) * | 2023-12-19 | 2024-01-19 | 哈尔滨工业大学 | Spectrum monitoring method for plasma propeller plume excited state ion velocity distribution |
| CN117420083A (en) * | 2023-12-19 | 2024-01-19 | 哈尔滨工业大学 | Online monitoring device and method for trace products of plasma erosion |
| CN117420083B (en) * | 2023-12-19 | 2024-04-09 | 哈尔滨工业大学 | Online monitoring device and method for trace products of plasma erosion |
| CN117420102B (en) * | 2023-12-19 | 2024-04-09 | 哈尔滨工业大学 | Optical on-line monitoring device and emitter life rapid assessment method |
| CN117425260B (en) * | 2023-12-19 | 2024-04-19 | 哈尔滨工业大学 | Spectrum monitoring method for plasma propeller plume excited state ion velocity distribution |
| CN118067395A (en) * | 2024-04-19 | 2024-05-24 | 哈尔滨工业大学 | On-orbit multichannel optical imaging monitoring system and method for far-field plume weak light zone |
| CN118090517A (en) * | 2024-04-19 | 2024-05-28 | 哈尔滨工业大学 | Optical monitoring method for corrosion products on wall surface of Hall thruster channel |
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