CN105388113B - Gas detection equipment - Google Patents
Gas detection equipment Download PDFInfo
- Publication number
- CN105388113B CN105388113B CN201510811100.7A CN201510811100A CN105388113B CN 105388113 B CN105388113 B CN 105388113B CN 201510811100 A CN201510811100 A CN 201510811100A CN 105388113 B CN105388113 B CN 105388113B
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- gas
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- gas chamber
- diode
- photoelectric conversion
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- 238000001514 detection method Methods 0.000 title claims abstract description 44
- 239000007789 gas Substances 0.000 claims abstract description 113
- 239000013307 optical fiber Substances 0.000 claims abstract description 50
- 238000006243 chemical reaction Methods 0.000 claims abstract description 33
- 238000012360 testing method Methods 0.000 claims abstract description 18
- 230000003287 optical effect Effects 0.000 claims abstract description 14
- 239000000835 fiber Substances 0.000 claims abstract description 6
- 239000003990 capacitor Substances 0.000 claims description 18
- 238000005086 pumping Methods 0.000 claims description 7
- 230000005611 electricity Effects 0.000 claims description 5
- 239000004038 photonic crystal Substances 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 2
- 230000005622 photoelectricity Effects 0.000 claims 1
- 239000004615 ingredient Substances 0.000 abstract description 7
- 238000000034 method Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 230000002238 attenuated effect Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000002894 chemical waste Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
Classifications
-
- 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
-
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
Landscapes
- Chemical & Material Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The present invention provides a kind of gas detection equipment, comprising: the first gas chamber comprising under test gas is equipped in first gas chamber: light source and the first optical fiber light source irradiation and with hole, wherein the gas is full of in first optical fiber；First optical fiber extends to the second gas chamber of vacuum from first gas chamber, the photoelectric conversion unit that is connected with first optical fiber is equipped in second gas chamber, for by it is being issued by the light source, via the optical signal of the first fiber optic conduction to the photoelectric conversion unit be converted into electric signal；The detection unit being connected with the photoelectric conversion unit determines ingredient included in the gas and corresponding concentration for detecting the variation of the electric signal, and based on change in electric detected.The present invention has the problems such as secondary pollution and gas detection equipment cannot flexibly detect various gases to environment during solving gas detection.
Description
Technical field
The present invention relates to a kind of detection fields, more particularly to a kind of gas detection equipment.
Background technique
The method of existing gas detection is mainly chemical method.This method is more traditional, the amount and addition of each reagent
Sequence also has stringent regulation, therefore operating process is complicated, and tester must have certain experience just and can be carried out operation.In addition it examines
Chemical waste fluid after having surveyed also causes secondary pollution to environment.
In view of the above problems, at present there are also a kind of sensor for specific gas, the letter transmitted using the sensor
Number detect its concentration.
But this is only applicable to respective gases, and can not detect further types of gas content.Therefore, it is necessary to the prior art
It improves.
Summary of the invention
In view of the foregoing deficiencies of prior art, it the purpose of the present invention is to provide a kind of gas detection equipment, is used for
Solving gas detection mode in the prior art has secondary pollution and gas detection equipment that cannot flexibly detect various gases environment
The problem of.
In order to achieve the above objects and other related objects, the present invention provides a kind of gas detection equipment, comprising: comprising to be measured
First gas chamber of gas is equipped in first gas chamber: light source and the first light light source irradiation and with hole
It is fine, wherein the gas is full of in first optical fiber；First optical fiber extends to the second of vacuum from first gas chamber
Gas chamber is equipped with the photoelectric conversion unit being connected with first optical fiber, for that will be sent out by the light source in second gas chamber
Out, via the optical signal of the first fiber optic conduction to the photoelectric conversion unit be converted into electric signal；With the photoelectric conversion list
The connected detection unit of member, determines the gas for detecting the variation of the electric signal, and based on change in electric detected
Ingredient included in body and corresponding concentration.
In one embodiment of the invention, it is additionally provided with air charging system on first gas chamber, is used for first gas chamber
It is filled under test gas；Second gas chamber is equipped with air extractor, for second gas chamber to be evacuated；With the inflation
The control unit that device is connected with air extractor is used to indicate the air charging system inflation and the instruction air extractor pumping.
In one embodiment of the invention, the photoelectric conversion unit include: be separated by with first optical fiber end it is default
Second optical fiber in gap；The tunable optic filter being connected with second optical fiber is used for the received light of the second optical fiber institute
Signal is filtered；The photoelectric converter being connected with the tunable optic filter.
In one embodiment of the invention, the photoelectric converter includes: bias power supply circuit, comprising: is managed comprising SHDN
The DC-DC conversion chip of foot and FB pin, the voltage regulator circuit being connected with the SHDN pin and FB pin；With the tunable filter
The connected photoelectric conversion circuit of wave device, comprising: receive the avalanche diode for the optical signal that the tunable optic filter is exported, bear
Input terminal connects the amplifier of the avalanche diode；Wherein, the positive input terminal ground connection of the amplifier, the amplifier are born
Feedback RC circuit is connected between input terminal and output end.
In one embodiment of the invention, the voltage regulator circuit includes: the capacitor C3 being connected with the SHDN pin, with institute
The concatenated diode D3 of capacitor C3 is stated, the diode D3 is grounded by capacitor C4, is connected with the output end of the diode D3
Partial pressure component；And it is connected to the capacitor C1 between the VCC pin and ground wire of the DC-DC conversion chip, concatenated inductance
L1, diode D1 and capacitor C2 are attempted by the both ends of the capacitor C1, and the output end of the diode D1 and diode D3's is defeated
Enter and is additionally provided with diode D2 between end.
In one embodiment of the invention, the detection unit is for by the voltage change curve of received electric signal and in advance
If all kinds of gases corresponding to voltage change table matched, and determined in the variation table according to matching result corresponding
Gas componant and corresponding concentration.
In one embodiment of the invention, the central wavelength of the light source is 1550nm.
In one embodiment of the invention, first optical fiber is photonic crystal fiber.
As described above, gas detection equipment of the invention, has the advantages that and utilizes the optical fiber for being full of under test gas
Ingredient and concentration in the attenuation Lai Jiance under test gas of the optical signal transmitted can be not necessarily to carry out chemical experiment, and
Quickly surrounding air is detected；In addition, using being inflated to the first gas chamber, being evacuated to the second gas chamber, so that
Two gas chambers generate draught heads, and enable gassy in the first optical fiber, thus test light of the optical fiber under under test gas environment
Attenuation change so enhances the relevance of attenuated optical signal and gas；In addition, light letter can be filtered out using tunable optic filter
The noise waves for being interfered and being generated by optical fiber in number improve detection accuracy；In addition, using avalanche diode and its bias supply electricity
Highly sensitive photoelectric conversion is realized on road.
Detailed description of the invention
Fig. 1 is shown as a kind of structural schematic diagram of embodiment of gas detection equipment of the invention.
Fig. 2 is shown as a kind of embodiment of bias power supply circuit in photoelectric conversion unit in gas detection equipment of the invention
Structural schematic diagram.
Fig. 3 is shown as a kind of embodiment of photoelectric conversion circuit in photoelectric conversion unit in gas detection equipment of the invention
Structural schematic diagram.
Component label instructions
1 gas detection equipment
11 light sources
12 first gas chambers
13 first optical fiber
14 second gas chambers
15 photoelectric conversion units
16 detection units
Specific embodiment
Embodiments of the present invention are illustrated by particular specific embodiment below, those skilled in the art can be by this explanation
Content disclosed by book is understood other advantages and efficacy of the present invention easily.
It should be clear that this specification structure depicted in this specification institute accompanying drawings, ratio, size etc., only to cooperate specification to be taken off
The content shown is not intended to limit the invention enforceable qualifications so that those skilled in the art understands and reads, therefore
Do not have technical essential meaning, the modification of any structure, the change of proportionate relationship or the adjustment of size are not influencing the present invention
Under the effect of can be generated and the purpose that can reach, it should all still fall in disclosed technology contents and obtain the model that can cover
In enclosing.
Referring to Fig. 1, it includes: the first gas chamber 12, the first optical fiber 13, the second gas that the present invention, which provides a kind of gas detection equipment,
Room 14, photoelectric conversion unit 15 and detection unit 16.
First gas chamber 12 and the second gas chamber 14 are sealed air chamber.Wherein, first gas chamber 12 is equipped with inflation
Device, second gas chamber 14 are equipped with air extractor.It is equipped in first gas chamber 12: light source 11.First optical fiber
13 both ends are located in each gas chamber.First optical fiber 13 has hole.For example, first optical fiber 13 is photonic crystal
Optical fiber.
When the air charging system and air extractor are activated simultaneously, air charging system is filled with external environment to the first gas chamber 12
Gas (as under test gas), 14 vacuum pumping of the second gas chamber, the pressure difference of two gas chambers make the first light by air extractor
The gas is full of in the hole of fibre 13.
Here, the air charging system includes: controlled valve and inflation air pump.The air extractor include: controlled valve and
It is evacuated air pump.(being unillustrated)
In order to ensure air charging system and air extractor start simultaneously, the gas detection equipment further include: control unit.
Described control unit is connected with the air charging system and air extractor, be used to indicate air charging system inflation and
Indicate the air extractor pumping.
Specifically, described control unit can be connected with the controlled valve of air charging system and air extractor.Each controlled valve
Connect respective inflation air pump or pumping air pump.When described control unit output control valve door open control signal when, respectively by
It controls valve and starts corresponding inflation air pump and pumping air pump.In this way, first gas chamber 12 and the second gas chamber 14 are inflated respectively
And pumping, realizing the first optical fiber 13 is influenced by draught head and is full of under test gas.
The light source 11 is located at one end of first optical fiber 13, and center of projection wavelength is into first optical fiber 13
The light of 1550nm, due to being full of under test gas in first optical fiber 13, light can be by gas to be measured after entering first optical fiber 13
Body influences and decays.Optical signal after 15 receiving attenuation of photoelectric conversion unit of 13 other end of the first optical fiber, and will
It is converted into electric signal.
For the accuracy of accurate subsequent detection, the port of the photoelectric conversion unit 15 and first optical fiber 13 is needed just
It is right.Meanwhile in order to prevent the connection of the first optical fiber 13 and photoelectric conversion unit 15 cause not being full of in the first optical fiber 13 it is to be measured
Gas, it is apertured between first optical fiber 13 and photoelectric conversion unit 15 to be connected.
Specifically, the photoelectric conversion unit 15 includes: to be separated by the second of prepsetting gap with 13 end of the first optical fiber
Optical fiber, tunable optic filter and photoelectric converter.Wherein, second optical fiber is exemplified as SMF optical fiber.
The tunable optic filter is used to for the received optical signal of the second optical fiber institute being filtered.Filtered light letter
Number in preset narrowband wide scope, the optical signal exported is passed to photoelectric converter by the tunable optic filter.
The photoelectric converter includes: bias power supply circuit and photoelectric conversion circuit.
As shown in Fig. 2, the bias power supply circuit include: the DC-DC conversion chip comprising SHDN pin and FB pin, with
The voltage regulator circuit that the SHDN pin is connected with FB pin.
Here, the voltage regulator circuit includes: the capacitor C3 being connected with the SHDN pin, with the capacitor C3 concatenated two
Pole pipe D3, the diode D3 are grounded by capacitor C4, the partial pressure component being connected with the output end of the diode D3；And
The capacitor C1 being connected between the VCC pin and ground wire of the DC-DC conversion chip, concatenated inductance L1, diode D1 and electricity
Hold the both ends that C2 is attempted by the capacitor C1, is additionally provided with two between the output end of the diode D1 and the input terminal of diode D3
Pole pipe D2.The output end of the bias power supply circuit is drawn from the partial pressure component.
Wherein, the partial pressure component includes: resistance R2, the R3 being connected between diode D3 output end and ground wire, with institute
State resistance R2 and R3 parallel connection, LC series circuit (inductance L2 and capacitor C5).The output end of the bias power supply circuit is inductance
The junction of L2 and capacitor C5.
As shown in figure 3, the photoelectric conversion circuit includes: to connect the snowslide with the output end of the bias power supply circuit
Diode, negative input end connect the amplifier of the avalanche diode, the positive input terminal ground connection of the amplifier, the amplifier
Negative input end and output end between be connected with feedback RC circuit.Here, the avalanche diode receives the tunable filtering
The optical signal that device is exported.
The detection unit 16 is connected with the output end (output end of the i.e. described amplifier) of the photoelectric conversion circuit, uses
In the variation of the detection electric signal, and ingredient included in the gas and phase are determined based on change in electric detected
The concentration answered.
Here, 16 pairs of received electric signals of institute of the detection unit sample, to obtain digitized voltage data, and
The received voltage data group of institute is sent into preset gas detection model, is obtained corresponding to corresponding gas componant and each ingredient
Concentration.Wherein, the gas detection model can be by learning to obtain under preparatory line.
Preferably, learn the time it takes and data sample under line to reduce, the detection unit 16 is used for institute
The voltage change curve for receiving electric signal is matched with voltage change table corresponding to preset all kinds of gases, and according to matching
As a result gas componant and corresponding concentration corresponding in the variation table are determined.
Specifically, the detection unit 16 has pre-saved each gas componant-concentration-voltmeter, the detection unit 16
After the received electric signal of institute is converted into digitized voltage data, by the feature in the change curve described by each voltage data
The corresponding voltage value of point is matched with each gas componant-concentration-voltmeter saved, if successful match, it is determined that phase
The gas componant and concentration answered.
For example, the detection unit 16 has pre-saved mixes different under test gas ingredients and the stable feelings of concentration in air
Under condition, the table of voltage value corresponding to the characteristic point in voltage change process over time, wherein the characteristic point includes
But it is not limited to: voltage change curve medium wave peak, voltage value of trough etc..The detection unit 16 is from according to the received each electricity of timing
Extracted in the change curve that is constituted of pressure data with the voltage value at characteristic point corresponding in table, and by extracted each voltage
Value is compared with voltage value corresponding to each gas in table, if being more than the voltage value of pre-set threshold numbers in default error
In range, then successful match is assert, and obtain the gas componant under test gas and respective concentration.
In conclusion the optical signal that gas detection equipment of the invention utilizes the optical fiber full of under test gas to be transmitted declines
Subtract the ingredient and concentration in situation Lai Jiance under test gas, quickly surrounding air can be carried out without carrying out chemical experiment
Detection；In addition, using being inflated to the first gas chamber, being evacuated to the second gas chamber, so that two gas chambers generate draught head, and
Gassy in the first optical fiber is enabled, thus changes to test optical attenuation of the optical fiber under under test gas environment, so enhances light
The relevance of signal decaying and gas；It is interfered and is generated by optical fiber in optical signal in addition, can be filtered out using tunable optic filter
Noise waves, improve detection accuracy；In addition, realizing highly sensitive light using avalanche diode and its bias power supply circuit
Electricity conversion.So the present invention effectively overcomes various shortcoming in the prior art and has high industrial utilization value.
The above-described embodiments merely illustrate the principles and effects of the present invention, and is not intended to limit the present invention.It is any ripe
The personage for knowing this technology all without departing from the spirit and scope of the present invention, carries out modifications and changes to above-described embodiment.Cause
This, institute is complete without departing from the spirit and technical ideas disclosed in the present invention by those of ordinary skill in the art such as
At all equivalent modifications or change, should be covered by the claims of the present invention.
Claims (4)
1. a kind of gas detection equipment characterized by comprising
The first gas chamber comprising under test gas is equipped in first gas chamber: light source and the light source irradiation and have hole
First optical fiber of gap, wherein the under test gas is full of in first optical fiber；
First optical fiber extends to the second gas chamber of vacuum from first gas chamber, in second gas chamber be equipped with it is described
First optical fiber linking photoelectric conversion unit, for by it is being issued by the light source, via the first fiber optic conduction to the photoelectricity
The optical signal of converting unit is converted into electric signal；
The detection unit being connected with the photoelectric conversion unit for detecting the variation of the electric signal, and has pre-saved each
Class gas-concentration-voltmeter, by gas-corresponding to the voltage change curve of received electric signal and preset all kinds of gases
Concentration-voltmeter is matched, and gas componant corresponding in the gas-concentration-voltmeter is determined according to matching result
With corresponding concentration；
The photoelectric conversion unit includes:
It is separated by the second optical fiber of prepsetting gap with first optical fiber end；
The tunable optic filter being connected with second optical fiber, for filtering the received optical signal of the second optical fiber institute
Wave；
The photoelectric converter being connected with the tunable optic filter；
The photoelectric converter includes:
Bias power supply circuit, comprising: the DC-DC conversion chip comprising SHDN pin and FB pin and the SHDN pin and FB
The connected voltage regulator circuit of pin；
The photoelectric conversion circuit being connected with the tunable optic filter, comprising: receive the light that the tunable optic filter is exported
Avalanche diode, the negative input end of signal connect the amplifier of the avalanche diode；Wherein, the positive input terminal of the amplifier
Ground connection, is connected with feedback RC circuit between the negative input end and output end of the amplifier；
The voltage regulator circuit includes:
The capacitor C3 being connected with the SHDN pin passes through electricity with the concatenated diode D3 of the capacitor C3, the diode D3
Hold C4 ground connection, the partial pressure component being connected with the output end of the diode D3；
And it is connected to capacitor C1, concatenated inductance L1, two poles between the VCC pin and ground wire of the DC-DC conversion chip
Pipe D1, capacitor C2 are attempted by the both ends of the capacitor C1, between the output end of the diode D1 and the input terminal of diode D3
It is additionally provided with diode D2.
2. gas detection equipment according to claim 1, it is characterised in that: be additionally provided with inflation dress on first gas chamber
It sets, for being filled under test gas to first gas chamber；
Second gas chamber is equipped with air extractor, for second gas chamber to be evacuated；
The control unit being connected with the air charging system and air extractor is used to indicate the air charging system inflation and instruction institute
State air extractor pumping.
3. gas detection equipment according to claim 1, it is characterised in that: the central wavelength of the light source is 1550nm.
4. gas detection equipment according to claim 1, it is characterised in that: first optical fiber is photonic crystal fiber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510811100.7A CN105388113B (en) | 2015-11-20 | 2015-11-20 | Gas detection equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510811100.7A CN105388113B (en) | 2015-11-20 | 2015-11-20 | Gas detection equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105388113A CN105388113A (en) | 2016-03-09 |
| CN105388113B true CN105388113B (en) | 2019-05-31 |
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ID=55420649
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510811100.7A Active CN105388113B (en) | 2015-11-20 | 2015-11-20 | Gas detection equipment |
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| CN (1) | CN105388113B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114674706B (en) * | 2022-05-30 | 2022-08-26 | 武汉鼎业环保工程技术有限公司 | Priori algorithm-based associated gas mining method and device |
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| Publication number | Publication date |
|---|---|
| CN105388113A (en) | 2016-03-09 |
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