CN110057780A - Gas concentration measuring apparatus, detection method and glass container quality inspection equipment in a kind of glass container - Google Patents
Gas concentration measuring apparatus, detection method and glass container quality inspection equipment in a kind of glass container Download PDFInfo
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- CN110057780A CN110057780A CN201910427471.3A CN201910427471A CN110057780A CN 110057780 A CN110057780 A CN 110057780A CN 201910427471 A CN201910427471 A CN 201910427471A CN 110057780 A CN110057780 A CN 110057780A
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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
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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
Abstract
The invention discloses gas concentration measuring apparatus and detection methods in a kind of glass container; including laser emitting module, signal processing module and gas emitting device, gas emitting device is used to generate the second protective gas beam of laser beam between the first protective gas beam of laser beam and package signal processing module and glass container between package laser emitting module and glass container；The absorption line of the first protective gas beam and the second protective gas beam is in except the tuning range of the laser emitting module.The present invention solves the problems, such as the interference due to other gas componants in open environment so that the second harmonic in each period shows irregular move up and down, it solves the problems, such as that the variation of the environmental factors such as temperature, pressure causes secondary harmonic amplitude consistency poor simultaneously, under test gas Concentration Testing precision and detection system stability has finally been significantly increased.
Description
Technical field
The invention belongs to gas concentration measuring apparatus, inspection in gas detection technology field more particularly to a kind of glass container
Survey method and glass container quality inspection equipment.
Background technique
Gas Thickness Detecting Technology in fields such as environmental protection, petrochemical industry, metallurgy, pharmacy, aviations using more and more extensive, it is adjustable
Humorous diode laser absorption spectrum (TDLAS) technology has the following advantages compared with other spectral techniques: non-intrusion measurement, right
Object gas selectivity height and good versatility, have carry out on-line checking packaged glass medicine bottle using laser both at home and abroad
The method of interior oxygen concentration being capable of high-precision if Lighthouse company has developed the instrument of a medicine bottle oxygen quantitative detection
Differentiation various concentration glass medicine bottle, but the static detection of oxygen concentration can only be carried out, not be able to satisfy medicament compartment to big
The online full inspection of the oxygen concentration of scale medicine bottle；Patent CN201610042058.1 discloses oxygen content in a kind of glass medicine bottle
Detection device and method, this method considers in laser detection optical path outer influence of the air to detection of glass medicine bottle, disclosed
In " background deduction " method, the measurement of standard jar (0% oxygen concentration) aspect of model is carried out in advance, is carried out afterwards to current test
The ambient noise of amount deducts, and with the benefit in short-term that certain ambient noise inhibits, but the time-varying for having ignored outside air is special
The individual difference of property and glass medicine bottle, haves the shortcomings that interference free performance is unstable, Shang Buneng precisely measures out each glass
Oxygen concentration in medicine bottle is chiefly used in the qualitative judgement of oxygen content in glass medicine bottle.
The online full inspection requirement of oxygen concentration in order to meet the extensive glass medicine bottle of medicament compartment, needs to consider open loop
Influence of the border to laser absorption signal, due to can exist between laser and vial, between vial and detector it is larger between
Away from generally respectively between 30 millimeters to 60 millimeters, and changing with factor of productions such as lots of drugs, packaging technologies；Another party
Face, the space length to be measured (bottle internal diameter) of medicine bottle to be measured is about 15 millimeters, 20 millimeters of equal-specifications；Furthermore it is deposited in the outer light path of bottle
Gas (be mostly air, and be mixed into a small amount of process gas in workshop) vulnerable to environmental factors such as temperature, pressure and air-flows
Interference, wherein gas molecule has very big randomness to the absorption light intensity of laser.Above-mentioned actual condition leads to laser
To the light path complexity time-varying between detector, and then detector is difficult to obtain stable second harmonic feature, it is also difficult to determine adaptation
Concentration threshold.
Therefore, a kind of method that can eliminate the interference of open environment factor is found, oxygen concentration detection can be substantially improved
Precision, and then TDLAS technology is supported to realize the oxygen concentration on-line checking of glass medicine bottle, it is a skill urgently to be resolved at present
Art problem.
Summary of the invention
The application aims to solve at least one of the technical problems existing in the prior art.For this purpose, an object of the present invention
It is to provide gas concentration measuring apparatus, detection method and glass container quality inspection equipment in a kind of glass container, it is existing to solve
Technology leads to the concentration threshold for being difficult to determine adaptation since open environment factor interferes the phenomenon for causing second harmonic unstable
The technical issues of.
In order to solve the above technical problems, the application adopts the following technical scheme that
Gas concentration measuring apparatus in a kind of glass container, comprising:
The side of glass container is arranged in laser emitting module, and it is tunable in the wave-length coverage of one fixed width
, which covers the absorption line of under test gas；
Signal processing module is set to the other side of glass container, for receiving the laser projected across glass container
Beam, and the concentration luminous intensity of the laser beam assessed to determine under test gas in glass container；
The gas concentration measuring apparatus further include:
Gas emitting device, for generating the first protection of laser beam between package laser emitting module and glass container
Second protective gas beam of laser beam between gas beam and package signal processing module and glass container；
The absorption line of the first protective gas beam and the second protective gas beam is in the tune of the laser emitting module
Except humorous range.
Further, the signal processing module includes signal generator module, photoelectric detector and photoelectric detector electricity
Property connection signal demodulation module and with signal demodulation module be electrically connected frequency analysis module, in which:
The signal generator module, for driving laser emitting module and exporting high-frequency signal to signal demodulation module
Two frequency-doubled signals；
The photoelectric detector, for obtaining the transmitted light intensity after laser penetration glass container and being converted into current signal；
The signal demodulation module, for extracting the second harmonic current signal of output current signal；
The frequency analysis module, for obtaining oxygen concentration according to second harmonic current signal.
Further, the laser emitting module includes laser and the laser control module for controlling laser, institute
Stating laser control module includes the current control module for controlling laser works electric current and the work for controlling laser
The temperature control modules of temperature.
Further, the signal for driving the laser emitting module of the signal generator module output is low frequency
The combination signal of sawtooth wave and high_frequency sine wave.
It further, further include for emitting laser alignment to pass through the collimator lens assembly of glass container and be used for
Coverage across the focus lens assembly of the laser of glass container, the collimation lens be set to laser and glass container it
Between, the focus lens assembly is set between glass container and photoelectric detector.
Further, the signal for driving the laser emitting module of the signal generator module output is low frequency
The combination signal of sawtooth wave and high_frequency sine wave.
Further, the first protective gas beam, the second protective gas beam and laser beam are coaxial.
Further, the central wavelength of the laser is 760nm.
Further, the glass container is glass medicine bottle, and the under test gas is oxygen.
Further, the first protective gas beam and the second protective gas beam are nitrogen beam.
Further, the first protective gas beam and the second protective gas beam are cylindrical.
Further, the gas emitting device includes pressure gas source, first gas nozzle and second gas nozzle, institute
It states first gas nozzle to be set in outside the Laser emission mouth of the laser emitting module, the second gas nozzle is set in institute
State outside the laser light incident mouth of signal processing module, the pressure gas source by conveyance conduit respectively with the first gas nozzle
It is connected with second gas nozzle, the conveyance conduit is equipped with air outlet valve and pressure gauge.
Further, the gas emitting device further includes pressure vessel, and the pressure vessel is equipped with intake valve
Air inlet and the gas outlet for being connected to the air outlet valve.
A kind of glass container quality inspection equipment, including above-mentioned measuring device, using above-mentioned measuring device to the glass after encapsulation
Gas concentration in container measures.
Gas concentration detection method in a kind of glass container, includes the following steps:
S1: laser emitting module emits laser beam and passes through glass container, wavelength of the laser emitting module in one fixed width
It is tunable, the absorption line of wave-length coverage covering under test gas in range；
S2: the laser beam projected out of glass medicine bottle is received by signal processing module, and is carried out to the luminous intensity of laser beam
Assess the concentration to determine under test gas in glass container；
In detection process, the laser beam between laser emitting module and glass container is wrapped up by the first protective gas beam；Letter
Laser beam is wrapped up by the second protective gas beam number between processing module and glass container；
The absorption line of the first protective gas beam and the second protective gas beam is in the tune of the laser emitting module
Except humorous range.
Further, the luminous intensity of laser beam is assessed in the step S2 to determine under test gas in medicine bottle
Detailed process is as follows for concentration:
Transmitted light intensity after obtaining laser penetration glass container；
Current signal after obtaining laser penetration glass container；
Extract the second harmonic current signal of output electric current；
Under test gas concentration is obtained according to the second harmonic current signal.
Further, the second harmonic current signal i2f(t) calculation formula are as follows:
i2f(t)=i0(t)N2L2S2cos(2ωt)
Wherein, ω is second harmonic current signal angular frequency, S2For second harmonic term coefficient.
Further, the calculation formula of under test gas concentration is obtained according to the second harmonic current signal are as follows:
i2f(t)=i0(t)N2L2S2cos(2ωt)
Wherein, N2For the under test gas concentration in glass container, i2fmaxFor the second harmonic current signal peak detected
Value, i0It (t) is the Injection Current of laser, L2Internal diameter, S for glass container2For second harmonic term coefficient.
Compared with prior art, the beneficial effects of the present invention are:
The present invention passes through the first protective gas Shu Jinhang by the laser beam between laser emitting module and glass container
Package, laser beam is wrapped up by the second protective gas Shu Jinhang between signal processing module and glass container；And first protects
The absorption line of gas beam and the second protective gas beam is in except the tuning range of laser emitting module, very good solution
Since the interference of other gas componants in open environment is so that the second harmonic in each period shows irregular jump up and down
Gas concentration detection accuracy and detection system stability greatly improved in dynamic problem.
Detailed description of the invention
Fig. 1 is the principle of the present invention schematic diagram；
Fig. 2 is structural block diagram of the invention；
Fig. 3 is perspective view of the invention；
Fig. 4 is the second harmonic waveform diagram after being influenced by open environment；
Fig. 5 is the second harmonic waveform diagram obtained using detection device of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts it is all its
His embodiment, shall fall within the protection scope of the present invention.
Referring to figures 1-3, in a kind of glass container at gas concentration measuring apparatus, including laser emitting module 1 and signal
Manage module 2, contain under test gas inside glass container 3, laser emitting module 1 is arranged in the side of glass container 3, and its
It is tunable, the absorption line of under test gas in the wave-length coverage cover glass container 3 in the wave-length coverage of one fixed width；
Signal processing module 2 is relatively arranged on the other side of glass container 3, for receiving the laser beam projected across glass container 3,
And the concentration luminous intensity of the laser beam assessed to determine under test gas in glass container 3.
Referring to Fig. 1 and Fig. 2, which further includes gas emitting device 4, which can
To generate the first protective gas beam 5 of laser beam 7 between package laser emitting module 1 and glass container 3 and wrap up at signal
Manage the second protective gas beam 6 of laser beam 7 between module 2 and glass container 3, thus realize laser beam and outside air every
From, the absorption line of the first protective gas beam 5 and the second protective gas beam 6 be in laser emitting module 1 tuning range it
Outside.
Referring to fig. 4, due to the interference by oxygen in open environment and other gas componants, it will lead to first time survey such as
Second harmonic waveform 9 each periodic amplitude it is different, that is, show it is irregular move up and down, and due to each
The time of measurement is different, the second harmonic waveform that the factors such as temperature, pressure in environment will change, therefore measure every time
9,10,11,12 there are inconsistency, and definition amplitude dither range is shaken in the upper bound that second harmonic is shaken 13 and second harmonic
Lower bound 14 between, the shake drop between 13 and 14 had exceeded second harmonic amplitude caused by gas concentration variation, with its peak
When value carries out retrieving concentration, will lead to the concentration results of each inverting, there are wild effects, in turn result in glass medicine bottle
The erroneous judgement of middle oxygen content.
When not using gas shield Shu Jinhang external environment to be isolated, detector detection penetrates the transmission after glass medicine bottle
Light intensity I (t) are as follows:
I (t)=I0·exp[-S1(T)N1L1P1g(v)]·exp[-S2(T)N2L2P2g(v)]·exp[-S3(T)N3L3P3g
(v)]
Chamber environment of the present embodiment because foring a constant pressure on the access that laser passes through, and filled in the environment
Expire nitrogen or its mixed gas, due to nitrogen molecule absorption line far from the tuning range of laser to outer, therefore lead to herein
On the road, laser intensity will not be absorbed substantially, therefore, the exp [- S in above-mentioned formula1(T)N1L1P1G (v)] item and exp [- S3
(T)N3L3P3G (v)] item is compared to exp [- S2(T)N2L2P2G (v)] item is cut in COUNTABLY VALUED and ignores, namely thinks in air
Oxygen absorption distracter in light path has been eliminated.
That is, the electric current letter after being isolated by gas shield Shu Jinhang external environment, after photoelectric detector photoelectric conversion
Number i (t) are as follows: i (t)=i0·exp[-S2(T)N2L2P2g(v)]
Wherein, i0For the Injection Current and light intensity I of laser0It is linear.
According to the output electric current i (t) of acquisition, by two frequency-doubled signal of high-frequency signal with signal generator point output into
After row quadrature demodulation, the second harmonic current signal i of output electric current i (t) can extract2f(t) are as follows:
i2f(t)=i0(t)N2L2S2cos(2ωt)
Wherein, ω is second harmonic current signal angular frequency, S2For second harmonic term coefficient.
Oxygen concentration is obtained according to second harmonic current signal.
Specifically, according to second harmonic current signal peak i2fmaxIt can Inversion Calculation oxygen concentration N are as follows:
Wherein, N2For the oxygen concentration in glass medicine bottle to be measured, i2fmaxFor the second harmonic current signal peak detected
Value, i0It (t) is the Injection Current of laser, L2Internal diameter, S for glass medicine bottle2For second harmonic term coefficient.
It can be concluded that, the application can reliably eliminate the disturbing factor in open environment from above-mentioned formula, i.e., glass medicine to be measured
Oxygen concentration N in bottle is unrelated with free surrounding space distracter, and L2、 S2For constant, i0It (t) is the Injection Current of laser, i.e., it is dense
Spend N and L2、S2、i0(t)、i2fmaxIt is in a linear relationship, it can accurately calculate oxygen concentration.
It can be apparent from from Fig. 5: first time to the 4th four measured the continuous week after eliminating open environment influence
The peak value of the second harmonic waveform 15,16,17,18 of phase is substantially on second harmonic horizontal line 19, i.e., each week for measuring every time
The second harmonic peak value of phase is without obvious bounce, and the second harmonic of different time measurement has good consistency, due to system
The a small range fluctuation of second harmonic caused by error will not cause threshold value to fail and judge by accident, therefore it is anti-to carry out concentration with its peak value
When drilling, influence of the open environment to second harmonic can be inhibited, second harmonic signal overall stability is improved and oxygen concentration is anti-
The precision drilled.It follows that the outside nitrogen environment building method of the embodiment of the present invention effectively inhibits second harmonic waveform
Oxygen concentration detection accuracy and detection system stability greatly improved in amplitude dither.
Glass container 3 is the glass medicine bottle for being packaged with drug in the present embodiment, correspondingly, under test gas be oxygen, first
Protective gas beam 5 and the second protective gas beam 6 are pure nitrogen gas beam, as the jet velocity and pressure of nitrogen beam, art technology
Personnel can need be adjusted according to actual design, it is only necessary to it is fully wrapped around by laser beam to meet nitrogen beam, with realize with
The purpose that peripheral air is isolated.
Need to illustrate, glass container 3 or other contain the structure of gas, under test gas can be with
For other gases such as carbon monoxide, in the tuning range for meeting mixed gas beam absorption line and being in laser emitting module
Except be basic premise, the first protective gas beam 5 and the second protective gas beam 6 can also use other inert gases, herein not
It repeats again.
The present invention is by passing through the first protective gas beam 5 for the laser beam between laser emitting module 1 and glass medicine bottle 3
It is wrapped up, laser beam is wrapped up by the second protective gas beam 6 between signal processing module 2 and glass medicine bottle 3；And
The absorption line of first protective gas beam 5 and the second protective gas beam 6 is arranged in the tuning range of laser emitting module 1
Except, very good solution is due to interference of other gas componants to detection in open environment, so that each period is secondary humorous
Wave shows irregular the problem of moving up and down, and gas concentration detection accuracy and detection system stability greatly improved.
Referring to figs. 2 and 3, in one embodiment, signal processing module 2 includes signal generator module in the present embodiment
201, photoelectric detector 202, the signal demodulation module 203 and and signal demodulation module that are electrically connected with photoelectric detector 202
The 203 frequency analysis modules 204 being electrically connected.
Wherein: signal generator module 201 is for the signal of output driving laser emitting module 1 and to the signal solution
Mode transfer block 203 exports two frequency-doubled signal of high-frequency signal.
Photoelectric detector 202 be used for obtains convergence after laser beam transmitted light intensity and be converted into current signal, signal demodulate
Module 203 is used to extract the second harmonic current signal of output current signal, and frequency analysis module 204 is used for according to secondary humorous
Signal wave current obtains oxygen concentration.
Laser emitting module 1 is for emitting the laser beam for penetrating glass container, including laser 102 and sharp for controlling
The laser control module 101 of light device 102, laser control module 101 include the current control for controlling laser works electric current
The temperature control modules 1012 of module 1011 and the operating temperature for controlling laser.As for photoelectric detector 202, signal
Demodulation module 203, frequency analysis module 204, laser 102, laser control module 101 and signal generator module 201 tool
Body structure and the control circuit of composition are the prior art, are not the improved emphasis of the application, details are not described herein.
Referring to Fig. 1 and Fig. 2, the present embodiment detection device further includes for emitting laser alignment to pass through medicine bottle to be measured
Collimation lens 103 and the laser for coveraging across medicine bottle to be measured condenser lens 205, collimation lens 103 is set to laser
Between device 102 and medicine bottle to be measured, condenser lens 205 is set between medicine bottle and photoelectric detector 202 to be measured.
Specifically, the signal for driving the laser emitting module of signal generator module output is low frequency sawtooth
With the combination signal of high_frequency sine wave, optionally, the central wavelength of laser is 760nm.
Referring to Fig. 1, this gives a kind of specific configurations of gas emitting device: holding including pressure gas source, pressure
Device 401, first gas nozzle 402 and second gas nozzle 403, first gas nozzle 402 are set in laser emitting module 1
Outside 103 Laser emission mouth of collimation lens, second gas nozzle 403 is set in swashing for condenser lens 205 on signal processing module 2
Outside optical entrance, pressure vessel 401 is equipped with the air inlet and air outlet with intake valve 404, and air inlet is connected to pressure gas
Source, gas outlet passes sequentially through conveyance conduit, triple valve 405 connects first gas nozzle 402 and second gas nozzle 403, defeated
It send pipeline to be equipped with air outlet valve 406 and pressure gauge 407, shape is sprayed by first gas nozzle 402 and second gas nozzle 403
At columned protective gas beam.
Detection device provided in this embodiment, DDS synthesizes low frequency sawtooth+height in FPGA piece in signal generator module 201
Frequency sine-wave drives laser 102 for being sent into laser control module 101, and corresponding Injection Current is i0(t), Laser emission mould
The current control module of block 1 accurately controls laser works electric current, and the temperature control modules of laser emitting module 1 are for controlling
The operating temperature of laser is allowed to constant；Above-mentioned modulated signal carries out electric current tuning to the Distributed Feedback Laser of central wavelength 760nm,
Generation intensity is I0(t) output intensity；Make the optical wavelength v (t) of laser that can cover the absorption line of oxygen, while gas
Emitter is blown into nitrogen, and a chamber environment is formed on laser via, interference of the open environment to laser is eliminated, through certainly
By being converted into electric signal i by photoelectric detector by the transmitted light intensity I (t) after the oxygen absorption in glass medicine bottle after space propagation
(t)；Signal demodulation part obtains second harmonic i2f(t) it exports, frequency analysis part passes through i2f(t) peak value i2fmaxCarry out to
The inverting of the oxygen concentration N in medicine bottle is surveyed, and then realizes the online content of oxygen content.
With reference to Fig. 3, from left to right successively according to optical path are as follows: laser 102, collimation lens 103, first gas nozzle
402, glass container 3, second gas nozzle 403, collector lens 205, photodetector 202.
A kind of glass container quality inspection equipment, including above-mentioned measuring device and quality inspection apparatus body, above-mentioned measuring device install additional
On quality inspection apparatus body, the gas concentration in the glass container after encapsulation is measured using above-mentioned measuring device.As for
The specific structure of quality inspection apparatus body can use existing structure.
Without loss of generality, measuring device is located on the lamp inspection machine transmission platform 8 of production glass-encapsulated drug, lamp inspection machine
Time T1 is moved synchronously to revolve direction D1 with glass medicine bottle to be measured on transmission platform 8, vial oxygen is completed in time T1
The detection of gas concentration；Then, driving mechanism by control and measure device along transmission platform reversed turning time T2, it is next to track
Medicine bottle is to complete the test of its oxygen concentration.
Particularly, time T1 and time T2 and should be equal to lamp inspection machine speed of production under single medicine bottle it is occupied when
Between T3, to adapt to the speed of production of glass medicine bottle.
Particularly, first gas nozzle 402 and 402 same specification size of second gas nozzle, specification are constrained in sharp
The diameter of light light beam, specification constrain the diameter of nitrogen air column.
Without loss of generality, the diameter of laser beam is adjusted to 1.5 millis by collimation lens 103 by the embodiment of the present invention
The diameter design of rice, first gas nozzle 402 and second gas nozzle 403 is that 2.0 millimeters namely D21 of initial diameter is
2.0 millimeter.
Referring to Fig. 3, laser 102 includes heat dissipation base and laser diode；First gas nozzle 402 is tapered bilayer
Structure, stream of nitrogen gas descend air inlet 4022, the first left air inlet from the first enterprising port 4021, first of first gas nozzle 402
Mouth, the first right air inlet 4023 input, and behind tapered interlayer gap, spray after the convergence of the spout of first gas nozzle.
The structure of second gas nozzle 403 is identical as first gas nozzle 402, and details are not described herein.
In conjunction with Fig. 1, Fig. 2 and Fig. 3, the gas emitting device of the embodiment of the present invention includes: intake valve 404, pressure vessel
401, air outlet valve 406, air gauge 407, three-way piece 405, the first delivery hose, the second delivery hose, first gas nozzle 402,
Second gas nozzle 403.
Nitrogen source gases introduce pressure vessel 401 from intake valve 404, and the Nitrogen source gases in pressure vessel 401 pass through outlet
Valve 406 is sent to air gauge 407, and the entrance of three-way piece 405 is connected by air gauge 707, passes through the from the first outlet of three-way piece
One delivery hose is sent into first gas nozzle 702, is sent into the second gas from the second outlet of three-way piece by the second delivery hose
Body nozzle 403.Stream of nitrogen gas is sprayed from its first gas nozzle 402, forms the first protective gas beam 5, realizes laser and glass
Laser optical path and open environment air is isolated between glass medicine bottle；Stream of nitrogen gas is sprayed from its second gas nozzle 403, forms the
Two protective gas beams 6 realize being isolated for laser optical path and open environment air between photoelectric detector and glass medicine bottle.
The technical effects of the invention are that in glass medicine bottle amount of oxygen detection process by open environment interfere
It influences, forms a chamber environment on laser via by the gas flow rate of pressure of pressure vessel, eliminate open environment to two
The influence of subharmonic waveform, another precision and economic benefit in view of detecting reasonably adjust the volume point of nitrogen in pressure vessel
Number, makes that retrieving concentration required precision can be reached but also saves cost of device.
Include: using the detailed process that above-mentioned detection device detects gas concentration in glass medicine bottle
Step 1 places a laser 102 in glass medicine bottle side, and a photoelectric detector 202 is placed in the other side；
201 output low frequency sawtooth wave of signal generator module+high_frequency sine wave in step 2, signal processing module 2 is sent into
Laser control module 101 drives laser 102, and laser 102 emits laser irradiation and penetrates glass medicine bottle；
Step 3, the air outlet valve for opening pressure vessel adjust nitrogen flow rate up to air gauge is stable and is clearly distinguishable from out
Environmental stress is put, until second harmonic waveform is without obvious shake.
Step 4, the gas that nozzle sprays forms a nitrogen chamber environment on laser via, is examined by photoelectric detector
Measure transmitted light intensity I (t).
Step 5, the output current signal i (t) of photoelectric detector 202 is sent into signal demodulation module 203, by with letter
After two frequency-doubled signal of high-frequency signal that number generation module 203 exports is multiplied, second harmonic current signal i is extracted2f(t)；
Step 6, by second harmonic current signal i2f(t) it is sent into frequency analysis module 204, is believed according to second harmonic current
Number peak value i2fmaxIt can Inversion Calculation oxygen concentration N.
Above-described embodiment is only to clearly demonstrate examples made by the present invention, rather than the restriction to embodiment.For
For those of ordinary skill in the art, can also make on the basis of the above description it is other it is various forms of variation or
It changes.Here without can not be also exhaustive to all embodiments.And thus amplify out it is obvious variation or
Variation is still in the protection scope of this invention.
Claims (10)
1. gas concentration measuring apparatus in a kind of glass container, comprising:
Laser emitting module, is arranged in the side of glass container, and its be in the wave-length coverage of one fixed width it is tunable, should
The absorption line of under test gas in wave-length coverage cover glass container；
Signal processing module is set to the other side of glass container, for receiving the laser beam projected across glass container, and it is right
The luminous intensity of the laser beam is assessed the concentration to determine under test gas in glass container；
It is characterized in that, the gas concentration measuring apparatus further include:
Gas emitting device, for generating the first protective gas beam of laser beam between package laser emitting module and glass container
And wrap up the second protective gas beam of laser beam between signal processing module and glass container；
The absorption line of the first protective gas beam and the second protective gas beam is in the tuning model of the laser emitting module
Except enclosing.
2. measuring device according to claim 1, it is characterised in that: the signal processing module includes that signal generates mould
Block, photoelectric detector, with photoelectric detector be electrically connected signal demodulation module and with signal demodulation module be electrically connected
Frequency analysis module, in which:
The signal generator module, for driving laser emitting module and exporting two frequency multiplication of high-frequency signal to signal demodulation module
Signal；
The photoelectric detector, for obtaining the transmitted light intensity after laser penetration glass container and being converted into current signal；
The signal demodulation module, for extracting the second harmonic current signal of output current signal；
The frequency analysis module, for obtaining oxygen concentration according to second harmonic current signal.
3. measuring device according to claim 2, it is characterised in that: the laser emitting module includes laser and is used for
The laser control module of laser is controlled, the laser control module includes the current control for controlling laser works electric current
The temperature control modules of module and the operating temperature for controlling laser；
The signal for driving the laser emitting module of signal generator module output be low frequency sawtooth and high frequency just
The combination signal of string wave.
4. measuring device according to claim 1, it is characterised in that: the axis of the laser beam and the axis of glass container
Line intersects vertically.
5. measuring device according to claim 1-4, it is characterised in that: the glass container is glass medicine bottle,
The under test gas is oxygen.
6. measuring device according to claim 5, it is characterised in that: the first protective gas beam and the second protective gas
Beam is nitrogen beam.
7. measuring device according to claim 6, it is characterised in that: the gas emitting device includes pressure gas source,
One gas nozzle and second gas nozzle, the first gas nozzle are set in the Laser emission mouth of the laser emitting module
Outside, the second gas nozzle is set in outside the laser light incident mouth of the signal processing module, and the pressure gas source passes through conveying
Pipeline is connect with the first gas nozzle and second gas nozzle respectively, and the conveyance conduit is equipped with air outlet valve and pressure
Table.
8. a kind of glass container quality inspection equipment, it is characterised in that: including the described in any item measuring devices of claim 1-7.
9. gas concentration detection method in a kind of glass container, includes the following steps:
S1: laser emitting module emits laser beam and passes through glass container, wave-length coverage of the laser emitting module in one fixed width
It is inside tunable, the absorption line of wave-length coverage covering under test gas；
S2: the laser beam projected out of glass container is received by signal processing module, and is assessed the luminous intensity of laser beam
To determine the concentration of under test gas in glass container；
It is characterized by: the laser beam between laser emitting module and glass container is by the first protective gas beam in detection process
Package；Laser beam is wrapped up by the second protective gas beam between signal processing module and glass container；
The absorption line of the first protective gas beam and the second protective gas beam is in the tuning model of the laser emitting module
Except enclosing.
10. detection method according to claim 9, it is characterised in that: in the step S2 to the luminous intensity of laser beam into
With the concentration that determines under test gas in glass container, detailed process is as follows for row assessment:
Transmitted light intensity after obtaining laser penetration glass container；
Current signal after obtaining laser penetration glass container；
Extract the second harmonic current signal of output electric current；
Under test gas concentration is obtained according to the second harmonic current signal.
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