CN107037004A - A kind of TDLAS detects SF6The device and method of humidity in electrical equipment - Google Patents
A kind of TDLAS detects SF6The device and method of humidity in electrical equipment Download PDFInfo
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- CN107037004A CN107037004A CN201710440738.3A CN201710440738A CN107037004A CN 107037004 A CN107037004 A CN 107037004A CN 201710440738 A CN201710440738 A CN 201710440738A CN 107037004 A CN107037004 A CN 107037004A
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- G—PHYSICS
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- 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
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/39—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using tunable lasers
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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
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
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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
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
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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
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
- G01N2021/0106—General arrangement of respective parts
- G01N2021/0112—Apparatus in one mechanical, optical or electronic block
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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
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N2021/3125—Measuring the absorption by excited molecules
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- 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
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N2021/3185—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry typically monochromatic or band-limited
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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
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/39—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using tunable lasers
- G01N2021/391—Intracavity sample
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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
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/39—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using tunable lasers
- G01N2021/396—Type of laser source
- G01N2021/399—Diode laser
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2201/00—Features of devices classified in G01N21/00
- G01N2201/06—Illumination; Optics
- G01N2201/061—Sources
- G01N2201/06113—Coherent sources; lasers
- G01N2201/0612—Laser diodes
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Abstract
SF is detected the invention discloses a kind of TDLAS6The device and method of humidity in electrical equipment, the program is also superimposed the wavelength modulation that a high frequency sinusoidal signal realizes laser while low frequency triangular wave is superimposed in laser drive current, after infrared beam absorbs through gas, electric signal is converted optical signals to by photodetector, subsequently into lock-in amplifier, frequency-doubled signal demodulation through sinusoidal signal first obtains the harmonic signal related to tested gas concentration, again by detecting the size of harmonic signal, so as to obtain the concentration of tested gas, to overcome the deficiencies in the prior art.
Description
Technical field
SF is detected the present invention relates to a kind of TDLAS6The device and method of humidity, belongs to SF in electrical equipment6Electrical equipment shows
Field detection technique field.
Background technology
SF6Moisture is mainly derived from SF in electrical equipment6New gas or SF6Itself contains moisture, SF6 equipment in regeneration gas
The moisture that is mixed into assembling maintenance overhaul and filling among tonifying Qi process, assembling and maintenance overhaul high-voltage electrical equipment when
Wait, moisture of the air included in may be brought into the inside of equipment.Adsorbent among insulating materials and equipment
Itself contain the moisture in water, point air via SF6Electrical equipment weak seal link and penetrate into inside of equipment etc.,
SF6When gas water content is higher, will easily occur in the phenomenon of insulating materials surface sweating, this can cause equipment exhausted
Edge declines, and can occur the accidents such as flashover breakdown serious when.And moisture is too high can cause a series of chain reactions, plus
Fast device interior corrosion.Detect SF6The moisture of electrical equipment is very necessary, in ieee standard, national standard, power industry
It is required to make Humidity detection in standard and company standard, and defines standard value, it is seen that its necessity.
Existing detection method is mainly SF6Moisture monitoring in electrical equipment is mainly comprising dew point method, capacitance-resistance method, electrolysis
Method and gravimetric method.Dew point method (Cold Mirrors method) is the condensation and humidity for measuring gas contained humidity, is also that current power industry is current
Measure the main stream approach of humidity.There is also certain weak point for dew point method.If having on a small quantity to steam in such as sulfur hexafluoride gas
Vapour form exist hydro carbons or arc cracked product, these materials before moisture condensation will condensation so that influence measurement tie
Really.In addition, environment temperature it is too high or it is too low can all influence the result of condensation, when serious even be unable to condensation.Capacitance-resistance method is also mesh
The main stream approach of preceding measurement humidity.It is disadvantageous in that irreversible decay, and error can be with use time and number of times increasingly
Greatly, and in the presence of by live electromagnetic interference problem.Electrolysis is not used substantially now, before this is due to in-site measurement, measurement system
System is in itself and moist, often there is background values, makes measurement result not accurate enough.Weight rule is referee method, but is only suitable for
Laboratory, it is impossible to be used in Site Detection SF6Humidity in electrical equipment.
The content of the invention
SF is detected it is an object of the invention to provide a kind of TDLAS6The device and method of humidity in electrical equipment, the program exists
A high frequency sinusoidal signal is also superimposed while low frequency triangular wave is superimposed in laser drive current and realizes that the wavelength of laser is adjusted
System, after infrared beam absorbs through gas, electric signal is converted optical signals to by photodetector, subsequently into lock-in amplifier,
Frequency-doubled signal demodulation through sinusoidal signal first obtains the harmonic signal related to tested gas concentration, then by detecting harmonic signal
Size, so that the concentration of tested gas is obtained, to overcome the deficiencies in the prior art.
To achieve the above object, the technical solution adopted by the present invention is that a kind of TDLAS detects SF6Humidity in electrical equipment
Device, including TDLAS controllers, power module, Laser emission end, detection light path system and receiving terminal, described power module
Output end is connected with TDLAS controller power source interface inputs；TDLAS controllers connect with Laser emission end and receiving terminal respectively
Connect；Detect light path system between Laser emission end and receiving terminal.
Described TDLAS controllers include OEM modules, temperature control modules and expansion module.
Described Laser emission end includes laser and base.
Described detection light path system is the how anti-chamber absorption cell of long light path or open light path lens.
Described receiving terminal includes photodiode, amplifying circuit, bias circuit and filter circuit, and optical signal first passes through
Photodiode detection is converted to faint electric signal, then connects amplifying circuit and electric signal is put by amplifying circuit
Greatly, filter circuit is eventually passed to be filtered it.Wherein bias circuit improves the reaction sensitivity of photodiode.
Collimation unit is provided between described Laser emission end and detection light path system, collimation unit is lens or optical fiber
Collimater.
Condenser lens is provided between described detection light path system and receiving terminal.
Described Laser emission end, detection light path system, receiving terminal, collimation unit and condenser lens is on the same line.
Described optical fiber collimator is butterfly.
Its TDLAS detects SF6The detection method of humidity is in electrical equipment：Low frequency three is superimposed in laser drive current
The wavelength modulation that a high frequency sinusoidal signal realizes laser is also superimposed while the ripple of angle, after infrared beam absorbs through gas, by
Photodetector converts optical signals to electric signal, and subsequently into lock-in amplifier, the frequency-doubled signal demodulation through sinusoidal signal is first
The harmonic signal related to tested gas concentration is obtained, then by detecting the size of harmonic signal, so as to obtain tested gas
Concentration.
It is compared with the prior art, the present invention has following technique effect：
, can moisture in detection device at the scene under any temperature first, do not limited by environment temperature
Second, not disturbed by other gas components, SF is accurately detected6Humidity (moisture) in electrical equipment.
Third, sensitivity is high, and not by live electromagnetic interference, and irreversible decay, detection is not present in optical means detection
Long lifespan, it is adaptable to Humidity Detection in on-site electrical equipment.
In summary, tunable laser method detection SF6Moisture can overcome the deficiencies in the prior art, advantage completely in gas
Substantially.
Brief description of the drawings
Fig. 1 is schematic diagram of device of the invention；
Fig. 2 is TDLAS detection principle diagram；
Fig. 3 is H2O FTIR line charts；
Label symbol explanation in accompanying drawing：
1st, TDLAS controllers；2nd, power module；3rd, Laser emission end；4th, light path system is detected；5th, receiving terminal, 6, collimation
Unit, 7, condenser lens.
Embodiment
The invention will be further described below in conjunction with the accompanying drawings.
As Figure 1-3, a kind of TDLAS of the invention detection SF6The device of humidity in electrical equipment, including TDLAS controls
Device 1 processed, power module 2, Laser emission end 3, detection light path system 4, receiving terminal 5, collimation unit 6, condenser lens 7, power supply mould
The output end of block 2 is connected with the power interface input of TDLAS controllers 1；TDLAS controllers 1 respectively with Laser emission end 3 and receive
End 5 is connected；Detect light path system 4 between Laser emission end 3 and receiving terminal 5；Detect light path system (4) and receiving terminal (5) it
Between be provided with condenser lens (7)；Laser emission end (3), detection light path system (4), receiving terminal (5), collimation unit (6) and focusing
Lens (7) are on the same line；Optical fiber collimator is butterfly.
TDLAS is Tunable Diode Laser Absorption Spectroscopy abbreviation, and translator of Chinese is can
Tuning diode laser absorption spectrum.Tunable diode laser absorption spectroscopy (TDLAS) technology is to utilize diode laser
Wavelength tuning characteristic, obtains the absorption spectrum in the range of the characteristic absorption spectrum of object gas, so as to be determined object gas
Property or quantitative analysis.The theoretical foundation of TDLAS technologies is LambertBeer laws.
According to LambertBeer laws：
I (v)=I0(v)exp(-S(T)g(v-v0)NL) (1)
(wherein, light intensity be with power it is proportional, I (v) be light by the light intensity after gas, S (T) is has with temperature T
The light intensity of pass, g (v-v0) it is absorption function, N is the molecule number concentration of gas, and L is sample optical path length, v0For absorption line
Centre frequency.)
Wherein I0(v) it is known with L, I (v) is measured after experiment porch is built with photodiode, it is necessary to ask just
It is N.Wherein g (v-v0) it is coefficient, show that different measuring environments, coefficient can be different by experiment.S (T) is for same
It is a constant at a certain temperature to plant gas.N can be calculated more than, you can draw concentration.
Firstly the need of object gas analysis spectral line is determined, so that it is determined that the wavelength of system laser light source.In TDLAS technologies
In, gas molecule target absorption choice of spectrum typically follows following several principles：
1. the absorption line of selection must have enough line strengths, to improve detection sensitivity and signal to noise ratio；
2. light, which is modulated, by tunable laser method can avoid other gas componants to selected absorption line
Produce interference；
3. guarantee have reliable laser diode light source meet absorption line detection the need for.
The data that spectrum analysis are provided according to HITRAN databases.HITRAN databases are real by Cambridge aerodynamic investigation
The high accuracy migration molecular database of the annual continuous renewal of room exploitation is tested, it is widely used in Trace gas detection, big
Gas pollutant research etc., and to provide various parameters using Lambert-Beer laws, such as the line of absorption line by force, position with
And some widen coefficient etc..By this spectra database to H2The analysis of the infrared spectral characteristic of O gases, determines object gas
H2O optimum analysis spectral line is the 2nd peak in 2460nm, i.e. Fig. 3.H2O absorption lines are as shown in figure 3, be shown as wave number in figure.
OEM modules are Laser emission Control architecture in Fig. 1, control the emitting portion of laser.Other template contrals are received
Hold the parts such as amplifying circuit, bias circuit, filter circuit, photoelectric diode.
Generally, due to which molecular structure is different, every kind of gas is only to those energy photon corresponding with its molecular entergy level
There is absorption, be spectrally reflected as the characteristic absorption spectrum of every kind of gas.When gas is irradiated by infrared beam, the gas
Body will absorb the luminous energy of its characteristic wavelength of part correspondence, reduce the light intensity of infrared beam, according to Bill's lambert's law,
By detecting that the attenuation degree of light intensity can just obtain the concentration information of gas.However, in mid infrared region, gas is to light
Absorptance is fainter.Therefore, the key technology that tiny signal is detection is extracted from ambient noise.
Using t unable filter (Tunable Diode Laser Absorption
Spectroscopy, TDLAS) improve detection sensitivity.System general principle in laser drive current as shown in Fig. 2 fold
Plus the wavelength modulation that a high frequency sinusoidal signal realizes laser is also superimposed while low frequency triangular wave, infrared beam is inhaled through gas
After receipts, electric signal is converted optical signals to by photodetector, subsequently into lock-in amplifier, the frequency-doubled signal through sinusoidal signal
Demodulation just obtains the harmonic signal related to tested gas concentration.By detecting the size of harmonic signal, realize that tested gas is dense
The measurement of degree.
Using infrared tuning semiconductor laser absorption spectrum gas detection method, with reference to highly sensitive wavelength modulation spectrum technology
With compact multiple reflections optical absorption pool technology, realize that moisture is detected.Fig. 1 show design principle, mainly by optics
System, electronics and Data collection and precessing system.Optical system includes being used for H2The near-infrared dfb semiconductor of O spectral detections
LASER Light Source, open compact multiple reflections long light path optical absorption pond and refer to absorption cell, and optical collimation lenses and
Transmission Fibers, electronics include laser temperature and current control circuit, modulation generating circuit, phase-sensitive detection electricity
Road, photodetector etc. are constituted, and semiconductor laser is coupled into optical absorption after passing through optical fiber output, collimation by incidence window
Pond, light beam absorption cell after multiple reflections by outgoing optical window outgoing, outgoing beam is by with reference to quilt after absorption cell
Focus on a photodetector photosurface, photosignal send phase sensitive detection circuit to carry out second-harmonic detection.Data acquisition
Carry out after A/D conversions and digital collection through multiple accumulation process, be used to the second harmonic signal that processing system absorbs to gas
Real time inversion gas concentration.
The foregoing is only a specific embodiment of the invention, but protection scope of the present invention is not limited thereto, any
Those familiar with the art the invention discloses technical scope in, change or replacement can be readily occurred in, should all be contained
Cover within protection scope of the present invention, therefore, protection scope of the present invention should be based on the protection scope of the described claims.
Claims (10)
1. a kind of TDLAS detects SF6The device of humidity in electrical equipment, including TDLAS controllers (1), power module (2), laser
Transmitting terminal (3), detection light path system (4) and receiving terminal (5), it is characterised in that：Described power module (2) output end with
TDLAS controllers (1) power interface input is connected；TDLAS controllers (1) respectively with Laser emission end (3) and receiving terminal (5)
Connection；Detect light path system (4) between Laser emission end (3) and receiving terminal (5).
2. a kind of TDLAS detections SF according to claim 16The device of humidity in electrical equipment, it is characterised in that：It is described
TDLAS controllers (1) include OEM modules, temperature control modules and expansion module.
3. a kind of TDLAS detections SF according to claim 16The device of humidity in electrical equipment, it is characterised in that：It is described
Laser emission end (3) include laser and base.
4. a kind of TDLAS detections SF according to claim 16The device of humidity in electrical equipment, it is characterised in that：It is described
Detection light path system (4) be the how anti-chamber absorption cell of long light path or open light path lens.
5. a kind of TDLAS detections SF according to claim 16The device of humidity in electrical equipment, it is characterised in that：It is described
Receiving terminal (5) receive optical signal faint electric signal is converted to by photodiode, then by transfer wire connection put
Big circuit, amplifying circuit is amplified to electric signal, and amplifying circuit connects filter circuit by transfer wire, after filtering circuit
It is filtered, wherein bias circuit is connected by transfer wire with photoelectric diode.
6. a kind of TDLAS detections SF according to claim 16The device of humidity in electrical equipment, it is characterised in that：It is described
Laser emission end (3) and detection light path system (4) between be provided with collimation unit (6), collimation unit (6) is lens or optical fiber
Collimater.
7. a kind of TDLAS detections SF according to claim 16The device of humidity in electrical equipment, it is characterised in that：It is described
Detection light path system (4) and receiving terminal (5) between be provided with condenser lens (7).
8. a kind of TDLAS detections SF according to claim 16The device of humidity in electrical equipment, it is characterised in that：It is described
Laser emission end (3), detection light path system (4), receiving terminal (5), collimation unit (6) and condenser lens (7) be in same straight line
On.
9. a kind of TDLAS detections SF according to claim 66The device of humidity in electrical equipment, it is characterised in that：It is described
Optical fiber collimator be butterfly.
10. a kind of TDLAS detects SF6The detection method of humidity in electrical equipment, it is characterised in that：In laser drive current
The wavelength modulation that a high frequency sinusoidal signal realizes laser is also superimposed while superposition low frequency triangular wave, infrared beam is through gas
After absorption, electric signal is converted optical signals to by photodetector, subsequently into lock-in amplifier, the frequency multiplication letter through sinusoidal signal
Number demodulation first obtains the harmonic signal related to tested gas concentration, then by detecting the size of harmonic signal, thus obtain by
Survey the concentration of gas.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710440738.3A CN107037004A (en) | 2017-06-13 | 2017-06-13 | A kind of TDLAS detects SF6The device and method of humidity in electrical equipment |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108931481A (en) * | 2018-07-26 | 2018-12-04 | 国网重庆市电力公司南岸供电分公司 | Wide dynamic pressure measurement instrument and its measurement method applied to SF6 high-voltage switch gear |
| CN109060625A (en) * | 2018-08-15 | 2018-12-21 | 中国科学院合肥物质科学研究院 | A kind of test device and its test method detecting film moisture-vapor transmission |
| CN110426371A (en) * | 2019-09-10 | 2019-11-08 | 国网重庆市电力公司电力科学研究院 | A kind of system detecting the HF gas in SF6 electrical equipment |
| CN111678886A (en) * | 2020-06-23 | 2020-09-18 | 贵州电网有限责任公司 | TDLAS (tunable diode laser absorption spectroscopy) determination SF (sulfur hexafluoride)6Method for calibrating and verifying humidity in equipment |
| CN111812048A (en) * | 2020-07-03 | 2020-10-23 | 山东科技大学 | Electric laser remote sensing device |
| CN111982819A (en) * | 2020-08-21 | 2020-11-24 | 国网北京市电力公司 | Device for detecting concentration of sulfur hexafluoride gas |
| CN113702332A (en) * | 2021-08-23 | 2021-11-26 | 贵州电网有限责任公司 | SF6 electrical equipment fault component CO2Concentration detection device and method |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN109060625A (en) * | 2018-08-15 | 2018-12-21 | 中国科学院合肥物质科学研究院 | A kind of test device and its test method detecting film moisture-vapor transmission |
| CN110426371A (en) * | 2019-09-10 | 2019-11-08 | 国网重庆市电力公司电力科学研究院 | A kind of system detecting the HF gas in SF6 electrical equipment |
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