CN104458702A - Portable gas explosive identification device based on Raman spectrum - Google Patents
Portable gas explosive identification device based on Raman spectrum Download PDFInfo
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- CN104458702A CN104458702A CN201410758067.1A CN201410758067A CN104458702A CN 104458702 A CN104458702 A CN 104458702A CN 201410758067 A CN201410758067 A CN 201410758067A CN 104458702 A CN104458702 A CN 104458702A
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Abstract
The invention provides a portable gas explosive identification device based on a Raman spectrum, aiming at solving the problem that most of existing gas explosive identification devices are inconvenient to carry and use due to too large volume. The portable gas explosive identification device based on the Raman spectrum comprises a sample pretreatment device, a first analysis unit, a second analysis unit, a data communication unit, a signal output display unit and a main control unit. The portable gas explosive identification device provided by the invention has the beneficial effects that an analysis and processing mechanism is not included in the identification device, so that the reduction of volume and the improvement of the portability of the identification device are facilitated; combustible gases such as methane can be detected, rapid, simple and noninvasive quantitative and qualitative analysis can be achieved, and the portable gas explosive identification device has obvious advantages in aspects of continuity, reliability, accuracy, sensitivity and the like; and the safety of gas explosives, namely combustible gases, in inspection and identification processes can be ensured to the greatest extent.
Description
Technical field
The present invention relates to a kind of analytical equipment based on Raman spectrum, more specifically, relate to a kind of portable gas explosive identifier based on Raman spectrum.
Background technology
Raman spectrum analysis technology is a kind of contactless spectral analysis technique based on Raman scattering effect, and it can carry out qualitative and quantitative analysis to the composition and structure of material.Raman spectroscopy measurement speed is fast, and application Raman spectrum analysis can accomplish that original position is measured in real time, is conducive to the real time on-line monitoring of process control.After there is laser in nineteen sixty, due to laser there is the features such as monochromaticity is good, concentration of energy, output power are large, the advantage such as especially spectral radiance density is high, lasing light emitter volume is little, lightweight, easy automation mechanized operation, so very fast excitation source laser being used for Raman spectrometer, thus Raman spectrum is made to obtain new starting point.The Raman spectroscopy of the laser Raman spectroscopy light source produced.Application laser has the characteristics such as monochromaticity is good, high directivity, brightness is high, coherence is good, combines, just create Surface enhanced raman spectroscopy with surface-enhanced Raman effects.Its remolding sensitivity normal Raman spectrum can improve 10^4 ~ 10^7 doubly, and the signal to noise ratio (S/N ratio) of analysis is improved greatly.
Spontaneous Raman scattering (Spontaneous Raman Scattering, SRS) can in various combustion field (as engine, burner and flame etc.) synchronous quantitative measurment main matter, as the concentration information of the gas such as N2, O2, H2O, CO2 and hydrocarbon.Because this combustion diagnosis technology based on laser has untouchable and feature that is time-space resolution, be widely used in the research to combustion process under various complex environment.But the SRS signal of gaseous state very weak (being about the 10-12 of excitation light intensity), must improve the energy of pulse laser to improve the signal to noise ratio (S/N ratio) of system to obtain high-quality SRS data.But too high pulse laser can cause the gas cracking on focal zone, the optical element on laser beam path and quartzy sealed window damage and directly light flammable gas to be measured.
Mostly there is the excessive problem being not easy to carry and use of volume in the existing gas burst thing identifier based on Raman spectrum.
Summary of the invention
In order to solve the aforementioned problems in the prior, the invention provides a kind of portable gas explosive identifier based on Raman spectrum, comprising: sample pretreatment apparatus, the first analytic unit, the second analytic unit, data communication units, signal output display unit and main control unit, described sample pretreatment apparatus for holding reaction liquid, to detect gas burst thing to be measured, i.e. sample gas, described main control unit is for controlling the input of sample gas, described quantum cascade laser sends the laser detecting described reaction liquid, the result that described data communication units is used for sample pretreatment apparatus to obtain is transferred to long-range analytic unit, for obtaining analysis result, described signal output display unit is used for obtaining and showing described analysis result, wherein said sample pretreatment apparatus and the first analytic unit are integrated in the first casing, described second analytic unit data communication units, signal output display unit and main control unit are integrated in another casing, and two described casings can removably combine, and be provided with backward stop valve and solenoid valve between two casings.
Further, described first analytic unit is Raman gas optical analysis unit.
Further, described second analytic unit is combustion analysis unit.
Further, described Raman gas optical analysis unit comprises admission line, exhaust line, sample gas analysis cavity, helium-neon laser plasma cell, optical instrument group and optical sensor; Sample gas analysis cavity, helium-neon laser plasma cell, optical instrument group and this four part of optical sensor belong to laser detector, are the core apparatus of Raman spectrum gas detecting system; Described admission line is connected with sample gas analysis cavity entrance point, is provided with one group of optical sensor in described sample gas analysis cavity, and each optical sensor respectively corresponding its detects the gas analyzed; Described helium-neon laser plasma cell produces laser beam, and is detected sample gas by the acting in conjunction of optical instrument group; Gas after described detection is discharged by described exhaust line.
Further, in described Raman gas optical analysis unit, admission line comprises a particulate filter, the filtrator of its filter diameter < 0.2 μm of particle, described exhaust line is provided with pressure transducer, flow sensor and pump, carry out detection and control to the gas of discharging.
Further, described optical instrument group comprises catoptron, prism and polariscope, for the change laser direction of catoptron, prism and polarizer, and amplifying laser energy.
Further, described optical analysis unit is used for the clean hot-temperedization process in flow process, dust in the preliminary filtering gas of 30 order core filter bulb, then passes through drying and the dry detected gas of condenser of in-built discolour silica gel drying agent.
Further, the output signal of described first analytic unit is for controlling the folding of described solenoid valve, and the break-make of pipeline described in described solenoid control.
The present invention has following beneficial effect:
1, analyzing and processing mechanism is not included in identifier itself, is conducive to reducing volume, improves the portability of identifier;
2, methane class inflammable gas can be detected.Quick, simple, undamaged quantitative-qualitative analysis can be realized.In continuity, reliability, accuracy, sensitivity etc., all there is clear superiority;
3, gas burst thing can be guaranteed to the full extent, that is, inflammable gas, the security in inspection and identifying.
Accompanying drawing explanation
Fig. 1 is the composition frame chart of the portable gas explosive identifier based on Raman spectrum according to a preferred embodiment of the invention.
Fig. 2 is the structural drawing of sample pretreatment apparatus.
Embodiment
Be described below in conjunction with summary of the invention and embodiment.As shown in Figure 1, the portable gas explosive identifier based on Raman spectrum comprises sample pretreatment apparatus, Raman gas optical analysis unit, combustion analysis unit, data communication units, signal output display unit and main control unit; Described sample pretreatment apparatus for holding reaction liquid, to detect gas burst thing to be measured, i.e. sample gas; Described main control unit is for controlling the input of sample gas, described quantum cascade laser sends the laser detecting described reaction liquid, the result that described data communication units is used for sample pretreatment apparatus to obtain is transferred to long-range analytic unit, for obtaining analysis result, described signal output display unit is used for obtaining and showing described analysis result.
According to a preferred embodiment of the invention, described sample pretreatment apparatus and the first analytic unit are integrated in the first casing, described second analytic unit data communication units, signal output display unit and main control unit are integrated in another casing, and two described casings can removably combine.In a preferred embodiment, these two casings are connected by the pipeline with the interface of gastight conduit, and have backward stop valve in the middle of pipeline.Before this stop valve, be also provided with solenoid valve.
In concrete application, described Raman gas optical analysis unit comprises admission line 1, exhaust line 2, sample gas analysis cavity 3, helium-neon laser plasma cell 5, optical instrument group and optical sensor.
Described admission line 1 is connected with sample gas analysis cavity 3 entrance point, is provided with one group of optical sensor 4 in described sample gas analysis cavity 3, and each optical sensor 4 respectively corresponding its detects the gas analyzed; Described helium-neon laser plasma cell 5 produces laser beam, and is detected sample gas by the acting in conjunction of optical instrument group; Gas after described detection is discharged by described exhaust line.
In described Raman gas optical analysis unit, admission line comprises a particulate filter 10, refer to the filtrator of energy filter diameter < 0.2 μm of particle, described exhaust line is provided with pressure transducer, flow sensor and pump, carry out detection and control to the gas of discharging.
Described optical instrument group comprises catoptron 6, prism and polariscope 7, and catoptron 6 is two panels altogether, is positioned at the two ends of laser detector, each a slice of polariscope, prism, is positioned at the outer two ends of sample gas analysis cavity.The effect of catoptron, prism and polarizer is exactly change laser direction, the effect of amplifying laser energy.
In described combustion analysis unit, be provided with gas sensor.Specifically, enter this combustion analysis unit through the gas of Raman gas optical analysis oxidized, oxidation reaction causes the change of described gas sensor output resistance.
The output signal of described Raman gas optical analysis unit is for controlling the folding of described solenoid valve.Like this, after Raman gas optical analysis unit, the concentration of gas is using as the foundation that whether will enter gas sensor, controls the break-make of described pipeline.And when gas sensor reacts; after being arranged on described solenoid valve, closer to the backward stop valve of combustion analysis unit, gas when preventing air-sensitive from reflecting is entered Raman gas optical analysis unit, thus the components and parts in Raman gas optical analysis unit to be played a protective role.
The present invention adopts raman laser other optical analytic unit and combustion analysis unit, and have the ability detecting methane class damp, detection technique index meets industry standard requirement, has exceeded prior art to the Detection results of hydrocarbon gas.
Above embodiment is only in order to illustrate technical scheme of the present invention but not to be limited; those of ordinary skill in the art can modify to technical scheme of the present invention or equivalent replacement; and not departing from the spirit and scope of the present invention, protection scope of the present invention should be as the criterion with described in claim.
Claims (8)
1. based on a portable gas explosive identifier for Raman spectrum, comprising: sample pretreatment apparatus, the first analytic unit, the second analytic unit, data communication units, signal output display unit and main control unit, described sample pretreatment apparatus for holding reaction liquid, to detect gas burst thing to be measured, i.e. sample gas, described main control unit is for controlling the input of sample gas, described quantum cascade laser sends the laser detecting described reaction liquid, the result that described data communication units is used for sample pretreatment apparatus to obtain is transferred to long-range analytic unit, for obtaining analysis result, described signal output display unit is used for obtaining and showing described analysis result, wherein said sample pretreatment apparatus and the first analytic unit are integrated in the first casing, described second analytic unit data communication units, signal output display unit and main control unit are integrated in another casing, and two described casings can removably combine, and be provided with backward stop valve and solenoid valve between two casings.
2. the portable gas explosive identifier based on Raman spectrum according to claim 1, is characterized in that, described first analytic unit is Raman gas optical analysis unit.
3. the portable gas explosive identifier based on Raman spectrum according to claim 1, it is characterized in that, described second analytic unit is combustion analysis unit.
4. the portable gas explosive identifier based on Raman spectrum according to claim 2, it is characterized in that, described Raman gas sample pretreatment apparatus comprises admission line, exhaust line, sample gas analysis cavity, helium-neon laser plasma cell, optical instrument group and optical sensor; Sample gas analysis cavity, helium-neon laser plasma cell, optical instrument group and this four part of optical sensor belong to laser detector, are the core apparatus of Raman spectrum gas detecting system; Described admission line is connected with sample gas analysis cavity entrance point, is provided with one group of optical sensor in described sample gas analysis cavity, and each optical sensor respectively corresponding its detects the gas analyzed; Described helium-neon laser plasma cell produces laser beam, and is detected sample gas by the acting in conjunction of optical instrument group; Gas after described detection is discharged by described exhaust line.
5. the portable gas explosive identifier based on Raman spectrum according to claim 4, it is characterized in that, in described Raman gas sample pretreatment apparatus, admission line comprises a particulate filter, the filtrator of its filter diameter < 0.2 μm of particle, described exhaust line is provided with pressure transducer, flow sensor and pump, carry out detection and control to the gas of discharging.
6. the portable gas explosive identifier based on Raman spectrum according to claim 4, it is characterized in that, described optical instrument group comprises catoptron, prism and polariscope, for the change laser direction of catoptron, prism and polarizer, amplifying laser energy.
7. the portable gas explosive identifier based on Raman spectrum according to claim 1, it is characterized in that, described sample pretreatment apparatus is used for the clean hot-temperedization process in flow process, dust in the preliminary filtering gas of 30 order core filter bulb, then the drying and the dry detected gas of condenser that pass through in-built discolour silica gel drying agent.
8. the portable gas explosive identifier based on Raman spectrum according to claim 1, is characterized in that, the output signal of described first analytic unit is for controlling the folding of described solenoid valve, and the break-make of pipeline described in described solenoid control.
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| CN108535195A (en) * | 2018-04-05 | 2018-09-14 | 武汉理工大学 | A kind of chemical industry fire fuel identification method based on combustion product |
| CN108693163A (en) * | 2018-05-21 | 2018-10-23 | 公安部第研究所 | A kind of integrated identity card checking instrument of Handheld Raman |
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