CN210005431U - device for measuring gas concentration in glass container and glass container quality inspection equipment - Google Patents
device for measuring gas concentration in glass container and glass container quality inspection equipment Download PDFInfo
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- CN210005431U CN210005431U CN201920748749.2U CN201920748749U CN210005431U CN 210005431 U CN210005431 U CN 210005431U CN 201920748749 U CN201920748749 U CN 201920748749U CN 210005431 U CN210005431 U CN 210005431U
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Abstract
The utility model discloses an kind of gas concentration measurement device and glass container quality testing equipment in glass container, including laser emission module, signal processing module and gas emission device, gas emission device is used for producing protective gas beam and the second protective gas beam of parcel laser beam between signal processing module and the glass container between parcel laser emission module and the glass container, protective gas beam and second protective gas beam's absorption spectral line is in outside the tuning range of laser emission module, the utility model provides a because the interference of other gaseous composition makes the second harmonic of every cycle present the problem of irregular fluctuation about, solved the environmental factor changes such as temperature, pressure simultaneously and lead to the poor problem of second harmonic amplitude uniformity, finally improved gas concentration detection precision and the detecting system stability of awaiting measuring by a wide margin.
Description
Technical Field
The utility model belongs to the technical field of gaseous detection, especially, relate to kinds of gaseous concentration measurement device in the glass container and glass container quality testing equipment.
Background
The gas concentration detection technology is applied to fields of environmental protection, petrifaction, metallurgy, pharmacy, aviation and the like more and more, compared with other spectrum technologies, the Tunable Diode Laser Absorption Spectrum (TDLAS) technology has the advantages of non-invasive measurement, high selectivity to target gas and good universality, a method for online detecting the oxygen concentration in a packaged glass medicine bottle by using laser is provided at home and abroad, for example, an instrument for quantitatively detecting the oxygen medicine bottle of model developed by Lighthouse company can accurately distinguish the glass medicine bottles with different concentrations, but only static detection of the oxygen concentration can be carried out, and online full detection of the oxygen concentration of large-scale medicine bottles in a pharmaceutical workshop cannot be met, and patent CN201610042058.1 discloses a detection device and a method for detecting the oxygen content in the glass medicine bottle, wherein the method considers the influence of air outside the glass medicine bottle on detection on a laser detection path, in a time-varying ' background deduction ' method ', a standard bottle (0% oxygen concentration) model characteristic is carried out in advance, background noise deduction current measurement quantity is carried out after that the background noise is deducted, the short-time-aging of constant noise suppression is realized, but the air characteristics of the glass medicine bottle and the air difference is ignored, and the defect that the oxygen concentration in the glass bottle is not stable is determined accurately exists.
In order to meet the requirement of online full detection of oxygen concentration of large-scale glass medicine bottles in pharmaceutical workshops, the influence of an open environment on laser absorption signals needs to be considered, as large distances exist between a laser and the glass bottles and between the glass bottles and a detector, is generally between 30 mm and 60 mm and changes along with production factors such as medicine batches, packaging processes and the like, in addition, in the aspect of , the length of a space to be detected (the inner diameter of the bottle) of the medicine bottle to be detected is about 15 mm, 20 mm and the like, in addition, gas (mostly air and a small amount of process gas mixed in a workshop) existing in an optical path outside the bottle is easily interfered by environmental factors such as temperature, pressure, air flow and the like, wherein gas molecules have great randomness on the absorption light intensity of the laser, and the actual working conditions cause that the optical path between the laser and the detector is complicated and time-varying, so that the detector cannot obtain stable second harmonic characteristics and cannot be easily adapted.
Therefore, it is an urgent need to solve technical problems to find methods capable of eliminating interference of open environment factors, so as to greatly improve the accuracy of oxygen concentration detection, and further support the TDLAS technology to realize online detection of oxygen concentration in glass vials.
SUMMERY OF THE UTILITY MODEL
This application aims at solving of the technical problem that exists among the prior art at least for this reason, the utility model aims at lie in providing kind of glass container interior gas concentration measuring device to solve prior art and lead to being difficult to confirm the technical problem of the concentration threshold value of adaptation because open environmental factor disturbs the unstable phenomenon of secondary harmonic.
In order to solve the technical problem, the following technical scheme is adopted in the application:
A device for measuring the concentration of a gas in a glass container, comprising:
the laser emission module is arranged on the side of the glass container and is tunable within a wavelength range with fixed width of , and the wavelength range covers the absorption spectral line of the gas to be measured;
the signal processing module is arranged on the other side of the glass container and is used for receiving the laser beam emitted by the glass container and evaluating the light intensity of the laser beam to determine the concentration of the gas to be measured in the glass container;
the gas concentration measuring apparatus further includes:
the gas emitting device is used for generating th protective gas beam wrapping the laser beam between the laser emitting module and the glass container and a second protective gas beam wrapping the laser beam between the signal processing module and the glass container;
the absorption lines of the th shielding gas beam and the second shielding gas beam are outside the tuning range of the laser emitting module.
, the signal processing module comprises a signal generating module, a photo detector, a signal demodulating module electrically connected to the photo detector, and a harmonic analyzing module electrically connected to the signal demodulating module, wherein:
the signal generation module is used for driving the laser emission module and outputting a high-frequency signal double-frequency signal to the signal demodulation module;
the photoelectric detector is used for acquiring the intensity of transmitted light of laser penetrating through the glass container and converting the intensity of the transmitted light into a current signal;
the signal demodulation module is used for extracting a second harmonic current signal of the output current signal;
and the harmonic analysis module is used for obtaining the oxygen concentration according to the second harmonic current signal.
, the laser emitting module comprises a laser and a laser control module for controlling the laser, and the laser control module comprises a current control module for controlling the laser operating current and a temperature control module for controlling the laser operating temperature.
, the th shielding gas beam and the second shielding gas beam are coincident with the axis of the laser beam.
, the th shielding gas beam and the second shielding gas beam are cylindrical.
And , the signal output by the signal generating module for driving the laser emitting module is a combined signal of a low-frequency sawtooth wave and a high-frequency sine wave.
, the device further comprises a collimating lens assembly for collimating the laser light emitted through the glass container and a focusing lens assembly for focusing the laser light passing through the glass container, wherein the collimating lens assembly is disposed between the laser and the glass container, and the focusing lens assembly is disposed between the glass container and the photodetector.
And , the signal output by the signal generating module for driving the laser emitting module is a combined signal of a low-frequency sawtooth wave and a high-frequency sine wave.
, the th shielding gas beam and the second shielding gas beam are coaxial with the laser beam.
Further , the laser has a center wavelength of 760 nm.
, the glass container is a glass bottle, and the gas to be measured is oxygen.
, the th shielding gas beam and the second shielding gas beam are nitrogen beams.
steps further, the gas emission device includes pressurized gas source, gas nozzle and second gas nozzle, gas nozzle cover is established outside the laser emission mouth of laser emission module, the second gas nozzle cover is established outside the laser incident mouth of signal processing module, pressurized gas source pass through pipeline respectively with gas nozzle and second gas nozzle are connected, last air outlet valve and the manometer of being equipped with of pipeline.
And , the gas emission device further comprises a pressure container, and the pressure container is provided with a gas inlet valve and a gas outlet connected to the gas outlet valve.
A glass container quality inspection apparatus comprises the measuring device, and the measuring device is used for measuring the gas concentration in the sealed glass container.
method for detecting gas concentration in glass container, comprising the following steps:
s1, a laser emitting module emits laser beams and penetrates through a glass container, the laser emitting module is tunable within a wavelength range with fixed width of , and the wavelength range covers an absorption spectral line of gas to be measured;
s2: the laser beam emitted from the glass medicine bottle is received by the signal processing module, and the light intensity of the laser beam is evaluated to determine the concentration of the gas to be detected in the glass container;
in the detection process, the laser beam between the laser emitting module and the glass container is wrapped by th protective gas beam;
the absorption lines of the th shielding gas beam and the second shielding gas beam are outside the tuning range of the laser emitting module.
, the specific process of evaluating the light intensity of the laser beam to determine the concentration of the gas to be measured in the vial in step S2 is as follows:
acquiring the transmission light intensity of laser after penetrating through the glass container;
acquiring a current signal after laser penetrates through the glass container;
extracting a second harmonic current signal of the output current;
and obtaining the concentration of the gas to be detected according to the second harmonic current signal.
, the second harmonic current signal i2fThe formula for calculation of (t) is:
i2f(t)＝i0(t)N2L2S2cos(2ωt)
where ω is the second harmonic current signal angular frequency, S2Is the second harmonic term coefficient.
, obtaining the calculation formula of the gas to be measured according to the second harmonic current signal is:
wherein N is2Is the concentration of the gas to be measured in the glass container, i2fmaxFor detected second harmonic current signal peaks, i0(t) is the injection current of the laser, L2Is the inner diameter, S, of a glass container2Is the second harmonic term coefficient.
Compared with the prior art, the beneficial effects of the utility model reside in that:
the utility model discloses a laser beam between laser emission module and glass container wraps up through protective gas bundle, the laser beam wraps up through the second protective gas bundle between signal processing module and the glass container, and protective gas bundle and second protective gas bundle's absorption spectrum line is outside the tuning range of laser emission module, fine solution makes every periodic second harmonic demonstrate the problem of irregular fluctuation owing to the interference of other gas composition in the open environment, gas concentration detection precision and detecting system stability have been improved by a wide margin.
Drawings
Fig. 1 is a schematic view of the present invention;
FIG. 2 is a block diagram of the present invention;
fig. 3 is a perspective view of the present invention;
FIG. 4 is a graph of a second harmonic waveform after exposure to an open environment;
fig. 5 is a second harmonic waveform diagram obtained by the detecting device of the present invention.
Detailed Description
The technical solution in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of , but not all embodiments.
Referring to fig. 1-3, an apparatus for measuring gas concentration in a glass container comprises a laser emitting module 1 and a signal processing module 2, wherein a gas to be measured is contained in the glass container 3, the laser emitting module 1 is disposed on the side of the glass container 3 and is tunable within the wavelength range with certain width, the wavelength range covers the absorption line of the gas to be measured in the glass container 3, and the signal processing module 2 is disposed on the other side of the glass container 3 and is used for receiving a laser beam emitted through the glass container 3 and evaluating the light intensity of the laser beam to determine the concentration of the gas to be measured in the glass container 3.
Referring to fig. 1 and 2, the gas concentration measuring apparatus further includes a gas emitting device 4, the gas emitting device 4 can generate th shielding gas beam 5 wrapping the laser beam 7 between the laser emitting module 1 and the glass container 3 and a second shielding gas beam 6 wrapping the laser beam 7 between the signal processing module 2 and the glass container 3, thereby achieving isolation of the laser beam from the outside air, and absorption lines of th shielding gas beam 5 and the second shielding gas beam 6 are out of a tuning range of the laser emitting module 1.
Referring to fig. 4, because of the interference of oxygen and other gas components in the open environment, the amplitude of each cycle of the second harmonic waveform 9 measured in th time is not samples, i.e. it shows irregular up-and-down jitter, and because the time of each measurement is different, the factors such as temperature and pressure in the environment will change, so that the second harmonic waveform 9, 10, 11, 12 measured each time has a discrepancy of , the jitter range of amplitude is defined between the upper bound 13 of the second harmonic jitter and the lower bound 14 of the second harmonic jitter, and the jitter between the bound 13 and the bound 14 exceeds the second harmonic amplitude change caused by the gas concentration, when the peak value is used for concentration inversion, the concentration result of each inversion will have an unstable phenomenon, and further cause the misjudgment of the oxygen content in the glass medicine bottle.
When the gas protection beam is not used for isolating the external environment, the detector detects the transmitted light intensity I (t) after penetrating the glass medicine bottle as follows:
I(t)＝I0·exp[-S1(T)N1L1P1g(v)]·exp[-S2(T)N2L2P2g(v)]·exp[-S3(T)N3L3P3g(v)]
in this embodiment, constant-pressure gas chambers are formed in the path through which the laser passes, and the environment is filled with nitrogen or its mixture, and the absorption line of nitrogen molecules is far from the tuning range of the laser, so the laser intensity is not absorbed on the path, therefore, exp [ -S ] in the above formula1(T)N1L1P1g(v)]Term and exp [ -S [ ]3(T)N3L3P3g(v)]Term compared to exp [ -S [ - ]2(T)N2L2P2g(v)]The term is cut to a negligible value, i.e. the oxygen absorption interference term in the optical path in air is considered to have been eliminated.
I.e. by gasAfter the protection beam is isolated from the external environment, the current signal i (t) after photoelectric conversion by the photoelectric detector is: i (t) ═ i0·exp[-S2(T)N2L2P2g(v)]
Wherein i0Injection current for laser, and light intensity I0And has a linear relationship.
According to the obtained output current i (t), after orthogonal demodulation is carried out on the high-frequency signal frequency doubling signal output by the signal generation part, a second harmonic current signal i (t) of the output current i (t) can be extracted2f(t) is:
i2f(t)＝i0(t)N2L2S2cos(2ωt)
where ω is the second harmonic current signal angular frequency, S2Is the second harmonic term coefficient.
And obtaining the oxygen concentration according to the second harmonic current signal.
In particular, according to the second harmonic current signal peak value i2fmaxThe oxygen concentration N can be calculated back as:
wherein N is2To measure the oxygen concentration in the glass vial i2fmaxFor detected second harmonic current signal peaks, i0(t) is the injection current of the laser, L2Is the inner diameter S of the glass medicine bottle2Is the second harmonic term coefficient.
According to the formula, the interference factors in the open environment can be reliably eliminated, namely the oxygen concentration N in the glass medicine bottle to be measured is irrelevant to the interference item of the external space, and L2、 S2Is a constant number i0(t) is the injection current of the laser, i.e. the concentrations N and L2、S2、i0(t)、
And the oxygen concentration can be accurately calculated in a linear relation.
It can be clearly seen from fig. 5 that the peak values of the second harmonic waveforms 15, 16, 17, 18 of the four consecutive periods measured from the th to the fourth times after the influence of the open environment is eliminated are substantially on the second harmonic horizontal line 19, that is, the peak value of the second harmonic of each period measured at each time does not jump significantly, and the second harmonic measured at different times has good characteristics, and the fluctuation of the second harmonic caused by the system error in a small range does not cause the threshold value to fail and be misjudged, so that when the peak value is used for performing concentration inversion, the influence of the open environment on the second harmonic can be suppressed, and the overall stability of the second harmonic signal and the accuracy of oxygen concentration inversion are improved.
In this embodiment, the glass container 3 is a glass vial in which a drug is packaged, correspondingly, the gas to be measured is oxygen, the th shielding gas beam 5 and the second shielding gas beam 6 are pure nitrogen beams, and as for the injection speed and pressure of the nitrogen beams, those skilled in the art can adjust the injection speed and pressure according to actual design requirements, and only the nitrogen beams are required to completely wrap the laser beam, so as to achieve the purpose of isolating the laser beam from the peripheral air.
It should be noted that the glass container 3 may also be of other structures containing gas, the gas to be measured may also be other gases such as carbon oxide, and on the basic premise that the absorption line of the mixed gas beam is outside the tuning range of the laser emission module, the protection gas beam 5 and the second protection gas beam 6 may also use other inert gases, which is not described herein again.
The utility model discloses a wrap up laser beam between laser emission module 1 and the glass medicine bottle 3 through protective gas bundle 5, the laser beam wraps up through second protective gas bundle 6 between signal processing module 2 and the glass medicine bottle 3, and protective gas bundle 5 and second protective gas bundle 6's absorption spectral line sets up outside being in laser emission module 1's tuning range, fine solution because other gas composition are to the interference that detects in the open environment, make every periodic secondary harmonic demonstrate the problem of irregular vertical runout, gas concentration detection precision and detecting system stability have been improved by a wide margin.
Referring to fig. 2 and fig. 3, in the embodiment, the signal processing module 2 in the present embodiment includes a signal generating module 201, a photo detector 202, a signal demodulating module 203 electrically connected to the photo detector 202, and a harmonic analyzing module 204 electrically connected to the signal demodulating module 203.
Wherein: the signal generating module 201 is used for outputting a signal for driving the laser emitting module 1 and outputting a high-frequency signal double frequency signal to the signal demodulating module 203.
The photoelectric detector 202 is used for acquiring the transmission light intensity of the converged laser beams and converting the transmission light intensity into a current signal, the signal demodulation module 203 is used for extracting a second harmonic current signal of the output current signal, and the harmonic analysis module 204 is used for obtaining the oxygen concentration according to the second harmonic current signal.
The laser emitting module 1 is used for emitting laser beams penetrating through a glass container and comprises a laser 102 and a laser control module 101 for controlling the laser 102, wherein the laser control module 101 comprises a current control module 1011 for controlling the working current of the laser and a temperature control module 1012 for controlling the working temperature of the laser. The specific structures and constituent control circuits of the photodetector 202, the signal demodulation module 203, the harmonic analysis module 204, the laser 102, the laser control module 101, and the signal generation module 201 are all the prior art, which is not the focus of the improvement of the present application, and are not described herein again.
Referring to fig. 1 and 2, the detection apparatus of the present embodiment further includes a collimating lens 103 for collimating the laser light to be emitted to pass through the vial to be detected and a focusing lens 205 for converging the laser light passing through the vial to be detected, the collimating lens 103 is disposed between the laser 102 and the vial to be detected, and the focusing lens 205 is disposed between the vial to be detected and the photodetector 202.
Specifically, the signal output by the signal generation module for driving the laser emission module is a combined signal of a low-frequency sawtooth wave and a high-frequency sine wave, and optionally, the center wavelength of the laser is 760 nm.
Referring to fig. 1, the present embodiment provides specific structures of a gas emitting device, including a pressure gas source, a pressure vessel 401, a gas nozzle 402 and a second gas nozzle 403, where the gas nozzle 402 is sleeved outside a laser emitting port of a collimating lens 103 of a laser emitting module 1, the second gas nozzle 403 is sleeved outside a laser incident port of a focusing lens 205 on a signal processing module 2, the pressure vessel 401 is provided with a gas inlet and a gas outlet with a gas inlet valve 404, the gas inlet is connected to the pressure gas source, the gas outlet is connected to the gas nozzle 402 and the second gas nozzle 403 sequentially through a conveying pipeline and a three-way valve 405, the conveying pipeline is provided with a gas outlet valve 406 and a pressure gauge 407, and a shielding gas beam is formed by spraying through the gas nozzle 402 and the second gas nozzle 403.
In the detection apparatus provided in this embodiment, the FPGA chip in the signal generation module 201 synthesizes the low-frequency sawtooth wave + the high-frequency sine wave, and the low-frequency sawtooth wave + the high-frequency sine wave are sent to the laser control module 101 to drive the laser 102, and the corresponding injection current is i0(t), the current control module of the laser emitting module 1 accurately controls the working current of the laser, and the temperature control module of the laser emitting module 1 is used for controlling the working temperature of the laser to be constant; the modulation signal carries out current tuning on the DFB laser with the center wavelength of 760nm to generate the intensity I0The output light intensity of (t) makes the wavelength v (t) of laser light cover the absorption spectrum line of oxygen, at the same time, the gas-emitting device blows nitrogen gas, on the laser channel gas chamber environments are formed, the interference of open environment to laser light is eliminated, the transmitted light intensity I (t) absorbed by oxygen in glass medicine bottle after free space transmission is converted into electric signal i (t) by photoelectric detector, signal demodulation portion obtains second harmonic i2f(t) output, harmonic analysis by i2f(t) peak value i2fmaxAnd inverting the oxygen concentration N in the medicine bottle to be detected so as to further realize the online content of the oxygen content.
Referring to fig. 3, the laser 102, the collimating lens 103, the th gas nozzle 402, the glass container 3, the second gas nozzle 403, the condensing lens 205, and the photodetector 202 are arranged in the order from left to right according to the optical path.
glass container quality inspection equipment comprises the measuring device and a quality inspection equipment body, wherein the measuring device is additionally arranged on the quality inspection equipment body, and the measuring device is used for measuring the concentration of gas in the packaged glass container.
Without losing , the measuring device is positioned on a light inspection machine transmission platform 8 for producing glass packaging medicines, the light inspection machine transmission platform 8 synchronously moves with the glass medicine bottle to be tested in the revolution direction D1 for a time T1, the detection of the oxygen concentration in the medicine bottle is completed within a time T1, and then the driving mechanism controls the measuring device to reversely rotate for a time T2 along the transmission platform so as to track the lower medicine bottle to complete the oxygen concentration test.
In particular, the sum of time T1 and time T2 should equal the time T3 taken by a single vial at the production rate of the light inspection machine to accommodate the production rate of glass vials.
Specifically, the th gas nozzle 402 is the same size as the second gas nozzle 402, the size being constrained by the diameter of the laser beam, the size being constrained by the diameter of the nitrogen gas column.
Without losing , the embodiment of the present invention adjusts the diameter of the laser beam to 1.5 mm through the collimating lens 103, and the diameters of the th gas nozzle 402 and the second gas nozzle 403 are designed to be 2.0 mm, i.e. the initial diameter of D21 is 2.0 mm.
Referring to fig. 3, the laser 102 comprises a heat dissipation base and a laser diode, the th gas nozzle 402 is a conical double-layer structure, nitrogen gas flow is input from the th upper gas inlet 4021, the th lower gas inlet 4022, the th left gas inlet and the th right gas inlet 4023 of the th gas nozzle 402, and is converged and sprayed out from the nozzle of the th gas nozzle after passing through a conical interlayer gap, the structure of the second gas nozzle 403 is the same as that of the th gas nozzle 402, and the description is omitted.
With reference to fig. 1, 2 and 3, the gas emitting device of the embodiment of the present invention includes an air inlet valve 404, a pressure vessel 401, an air outlet valve 406, a barometer 407, a tee 405, an -th delivery hose, a second delivery hose, a -th gas nozzle 402, and a second gas nozzle 403.
The nitrogen gas source is introduced into the pressure container 401 from the gas inlet valve 404, the nitrogen gas source in the pressure container 401 is sent to the gas pressure gauge 407 through the gas outlet valve 406, the inlet of the three-way piece 405 is connected through the gas pressure gauge 707, the nitrogen gas source is sent to the gas nozzle 702 from the th outlet of the three-way piece through the th conveying hose, and the nitrogen gas stream is sent to the second gas nozzle 403 from the second outlet of the three-way piece through the second conveying hose, the nitrogen gas stream is sprayed out from the gas nozzle 402 to form a th protective gas beam 5, so that the laser light path between the laser and the glass medicine bottle is isolated from the open ambient air, and the nitrogen gas stream is sprayed out from the second gas nozzle 403 to form a second protective gas beam 6, so that the laser light path between the photoelectric detector and the.
The technical effect of the utility model lies in, receive open environmental interference's influence to glass medicine bottle oxygen volume testing process, the gas flow velocity through adjusting pressure vessel forms air chamber environments on laser access, eliminates open environment to the influence of second harmonic wave form, considers the precision and the economic benefits that detect in addition, the volume fraction of nitrogen gas among the reasonable adjustment pressure vessel makes and can reach concentration inversion required precision and save equipment overhead again.
Adopt above-mentioned detection device to the concrete process that gas concentration detected in the glass medicine bottle includes:
and 3, opening an air outlet valve of the pressure container, and adjusting the nitrogen flow rate until the barometer is stable and is obviously different from the open environment pressure until the second harmonic waveform does not shake obviously.
And 4, forming an environment of nitrogen gas chambers on the laser channel by the gas sprayed from the nozzle, and detecting the transmission light intensity I (t) by a photoelectric detector.
In the step 5, the step of the method is that,the output current signal i (t) of the photodetector 202 is sent to the signal demodulation module 203, multiplied by the high frequency signal frequency doubling signal output by the signal generation module 203, and then the second harmonic current signal i (t) is extracted2f(t)；
The above examples are merely illustrative of the present invention clearly and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. Nor is it intended to be exhaustive of all embodiments. And obvious changes and modifications may be made without departing from the scope of the present invention.
Claims (10)
- An apparatus for measuring the concentration of a gas in a glass container, comprising:the laser emission module is arranged on the side of the glass container and is tunable within a wavelength range with fixed width , and the wavelength range covers the absorption spectral line of the gas to be measured in the glass container;the signal processing module is arranged on the other side of the glass container and is used for receiving the laser beam emitted by the glass container and evaluating the light intensity of the laser beam to determine the concentration of the gas to be measured in the glass container;it is characterized in that the gas concentration measuring device further comprises:the gas emitting device is used for generating th protective gas beam wrapping the laser beam between the laser emitting module and the glass container and a second protective gas beam wrapping the laser beam between the signal processing module and the glass container;the absorption lines of the th shielding gas beam and the second shielding gas beam are outside the tuning range of the laser emitting module.
- 2. The measurement device of claim 1, wherein: the signal processing module comprises a signal generating module, a photoelectric detector, a signal demodulating module electrically connected with the photoelectric detector and a harmonic analyzing module electrically connected with the signal demodulating module, wherein:the signal generation module is used for driving the laser emission module and outputting a high-frequency signal double-frequency signal to the signal demodulation module;the photoelectric detector is used for acquiring the intensity of transmitted light of laser penetrating through the glass container and converting the intensity of the transmitted light into a current signal;the signal demodulation module is used for extracting a second harmonic current signal of the output current signal;and the harmonic analysis module is used for obtaining the oxygen concentration according to the second harmonic current signal.
- 3. The measurement device of claim 2, wherein: the laser emission module comprises a laser and a laser control module used for controlling the laser, and the laser control module comprises a current control module used for controlling the working current of the laser and a temperature control module used for controlling the working temperature of the laser.
- 4. A measuring device according to claim 3, characterized in that: the signal output by the signal generation module and used for driving the laser emission module is a combined signal of low-frequency sawtooth waves and high-frequency sine waves.
- 5. The measurement device of claim 1, wherein: the axis of the laser beam is perpendicularly intersected with the central axis of the glass container.
- 6. The measuring device according to claim 1, wherein the th shielding gas beam and the second shielding gas beam are coincident with the axis of the laser beam.
- 7. The measuring device of any one of claims 1-6, wherein the glass container is a glass bottle and the gas to be measured is oxygen.
- 8. The measuring apparatus according to claim 7, wherein the th shielding gas beam and the second shielding gas beam are nitrogen beams.
- 9. The measuring device according to claim 7, wherein the gas emitting device comprises a pressure gas source, an th gas nozzle and a second gas nozzle, the th gas nozzle is sleeved outside the laser emitting port of the laser emitting module, the second gas nozzle is sleeved outside the laser incident port of the signal processing module, the pressure gas source is respectively connected with the th gas nozzle and the second gas nozzle through a delivery pipe, and the delivery pipe is provided with a gas outlet valve and a pressure gauge.
- 10, A glass container quality inspection apparatus, comprising the measuring device of any of claims 1-9 through .
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110057780A (en) * | 2019-05-22 | 2019-07-26 | 中南大学 | Gas concentration measuring apparatus, detection method and glass container quality inspection equipment in a kind of glass container |
| CN111398216A (en) * | 2020-05-20 | 2020-07-10 | 中南大学 | Multi-frequency modulation method for gas concentration detection, gas concentration detection method and system |
| CN113324911A (en) * | 2021-07-09 | 2021-08-31 | 中南大学 | Glass bottle applied to gas concentration detection and concentration detection method and system thereof |
-
2019
- 2019-05-22 CN CN201920748749.2U patent/CN210005431U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110057780A (en) * | 2019-05-22 | 2019-07-26 | 中南大学 | Gas concentration measuring apparatus, detection method and glass container quality inspection equipment in a kind of glass container |
| CN111398216A (en) * | 2020-05-20 | 2020-07-10 | 中南大学 | Multi-frequency modulation method for gas concentration detection, gas concentration detection method and system |
| CN113324911A (en) * | 2021-07-09 | 2021-08-31 | 中南大学 | Glass bottle applied to gas concentration detection and concentration detection method and system thereof |
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