CN101308125B - Photoionization detector, gas-chromatography detection system and chromatographic detector method - Google Patents
Photoionization detector, gas-chromatography detection system and chromatographic detector method Download PDFInfo
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- CN101308125B CN101308125B CN 200710040807 CN200710040807A CN101308125B CN 101308125 B CN101308125 B CN 101308125B CN 200710040807 CN200710040807 CN 200710040807 CN 200710040807 A CN200710040807 A CN 200710040807A CN 101308125 B CN101308125 B CN 101308125B
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Abstract
The invention provides a photoionization detector and a gas phase chromatography detecting system comprising the photoionization detector. The photoionization detector includes: a gas chamber which is arranged for allowing gases to flow in and out; a ground state stabilizer which is near to the gas chamber and is designed for at least stabilizing the temperature in the gas chamber between 100 DEG C and 150 DEG C; an ultraviolet lamp in which inert gases and an optical window are arranged; an exciting electrode which is disposed at the outer side of the ultraviolet lamp for exerting exciting signals on the ultraviolet lamp and making the inert gases in the ultraviolet lamp discharge and generate ultraviolet light which shoots into the gas chamber through the optical window and ionizes the gases in the gas chamber; a collecting electrode which is arranged in the gas chamber for capturing the ionized gas electric charge in the gas chamber and transforming the electric charge into current signals; and a shell which is designed for containing the exciting electrode, the ultraviolet lamp and the gas chamber. Wherein, the shell and the gas chamber are made of inert materials.
Description
Technical field
The present invention relates to a kind of photoionization detector (PID), especially, relate to a kind of gas-chromatography detection system and corresponding gas-chromatography detection method that comprises the photoionization detector of ground state stabilizer and use this photoionization detector.
Background technology
As everyone knows, chromatography is a kind of important method for separating and analyzing, it is different partition factors, adsorption coefficient or the perviousness of utilizing different material to have in two-phase, and when two-phase was done relative motion, these materials carried out the multiple reversal subdivision and join and realize separating in two-phase.
Typical gas chromatography (GC) detecting device has the carrier gas of regime flow, bring the sample of vaporization into chromatographic column by vaporizer, different component obtains separating in chromatographic column, and successively from chromatographic column, flow out, through detector and register, these separated components become chromatographic peak one by one.
Have multiple gas chromatography detector in the prior art, comprising: flame ionization detector (FID), electron capture detector (ECD), thermal conductivity detector (TCD) (TCD) and photoionization detector (PID).
First three plants pick-up unit all respectively shortcoming aspect portability, sensitivity, sensing range and the security.Hydrogen flame detector (FID, flame ionization detector) is to utilize hydrogen flame to make ionization source, makes organism ionization, produces the detecting device of little electric current.It is destructive, typical mass flow rate sensitive detector.
Advantage: nearly all organism all there is response, particularly highly sensitive to hydrocarbon compound, and also response is directly proportional with carbon number; Insensitive to gas flow rate, pressure, temperature variation.Its range of linearity is wide, and is simple in structure, easy to operate.Its dead volume is almost nil.Therefore, as Laboratory Instruments, FID obtains general application, is the most frequently used gas chromatography detector.
Shortcoming: need inflammable gas-hydrogen, combustion-supporting gas and three kinds of source of the gas steel cylinders of carrier gas and flow velocity control system thereof.Therefore, it is very difficult to be made into integrated portable instrument, and the analysis of particularly tackling the sudden pollusion atmospheric event is just more difficult with detection, because it needs point " fire ", has increased the potential danger of igniting, igniting.
Thermal conductivity detector (TCD) (TCD, thermal conductivity detector) is to utilize tested component and the concentration detector of response different with the carrier gas thermal conductivity coefficient, and it is the overall performance detecting device, belongs to the physical constant detection method.
The principle of work of advantage: TCD has determined that it except carrier gas itself, all has response to other all substances, because different materials all has different thermal conductivity coefficients, as long as the thermal conductivity coefficient of tested component and carrier gas is variant, response is just arranged.Particularly use H2 (or He) to do carrier gas, the thermal conductivity coefficient of other classes of compounds is all much smaller than them, very easily response.
The sensitivity of shortcoming: TCD is low, and this is to affect the principal element that it is applied to environmental analysis and detection.General TCD detects and is limited to 100ppm, and the TCD detectability of the memsization of superior performance can be accomplished 1ppm.
Electron capture detector (ECD, electronic capture detector) is that the beta rays particle and the carrier gas collision that utilize radioactive source to emit produce electronic secondary and positive ion formation sensing chamber background current; After having electronegative component and entering, caught electronics, become electronegative ion, so that sensing chamber's background current reduces, produce the chromatographic peak signal of falling.
Advantage: concentration type selective detector can provide extremely significant response signal to electronegative component.Be used for analyzing halogen compounds, polynuclear aromatic hydrocarbons, some metallo-chelates and steride.
Shortcoming: radioactive source is arranged, increased unsafe factor.ECD is very easily contaminated, needs a large amount of carrier gas tails to blow detecting device during use, and detecting device preferably will be heated to more than 300 degree.
By contrast, photoionization detector PID is a super-sensitive wide region detecting device, can detect most volatile organic gas and part mineral compound.It can Measurement accuracy 1ppb (10
-9) to 10000ppm (10
-2) order of magnitude can by its ionization volatile organic compounds (VOC) and the concentration of other inorganic toxic gas.
Fig. 1 shows a kind of PID30 commonly used.PID30 comprises a ultraviolet (UV) lamp 32, and direct current, radio frequency or microwave by the outside make it excite discharge, produces UV photon or ultraviolet light, by optical window 34 with UV photon or ultraviolet radiation in gas compartment 36.After sample gas enters gas compartment 36, the gas molecule collision in UV photon and the gas compartment 36, collision produces detectable ion and electronics so that those ionization energy are lower than the molecular ionization of photon energy.Passive electrode by ion detector 38 catches Ionized electric charge, and is converted into measurable current signal.This current signal can be transfused to externally measured circuit, and is converted into the signal of the concentration that can determine gas to be measured.
Usually, UV lamp 32, gas compartment 36, ion detector 38 are installed in the shell 78 the PID sensor element of being integrally formed.In the commercial Application of reality, the normal operation inert material, for example, special fluorine jade for asking rain (Teflon, i.e. teflon) is constructed the shell 78 of PID and gas compartment 36 outer walls of inside.The advantage of this material is that it has lower loss, low-friction surface, good chemical resistance, and measured volatile organic compounds is had chemical inertness, and the high energy UV photon that simultaneously uviol lamp 32 is sent is opaque.Therefore, can obtain more accurately measurement result and do not produce leaking of UV light.Inert material also can include but not limited to: polycarbonate (polycarbonate), polypropylene (polypropylene), polyurethane (polyurethane), Polyvinylchloride (polyvinylchloride), etc.
In the gas chromatography detector of prior art, in order to realize preferably measurement result, the expectation chromatographic detector has a more stable baseline.The general method that adopts is that optical ionic detector PID is positioned in the well heater at present, and it is stabilized in a certain design temperature.Yet as mentioned above, PID shell and the inner inert materials such as the special fluorine jade for asking rain of the many employings of gas compartment, because these materials are high temperature resistant, therefore the heat that produces from the well heater of outside can't be delivered to PID inside fast to reach equalized temperature, and this steady state (SS) that causes whole chromatographic detector to reach signal base line needs the longer time.Under regular situation, reach and stablize the needed time and be generally 2-3 hours.
Simultaneously, in the optical ionic detector PID of prior art, when volatile organic compounds concentration to be measured was low, for example, when being the concentration below tens ppb, sensitivity and the signal to noise ratio (S/N ratio) of measured signal were on the low side, can't obtain accurately gas concentration measurement value.
From the above mentioned, be badly in need of at present a kind of gas chromatography detector that can carry out fast and stable and have better measurement signal to noise ratio (S/N ratio) and sensitivity.
Summary of the invention
The object of the invention is to solve at least above-mentioned existing problem.
According to an aspect of the present invention, a kind of photoionization detector is provided, comprise: the inflow and the effluent air chamber that are configured to allow gas, and ground state stabilizer, be configured near described gas compartment, and be configured in the equilibrium temperature scope of temperature stabilization between 100 degrees centigrade to 150 degrees centigrade to the described gas compartment of major general.
According to a further aspect of the invention, further provide a kind of photoionization detector to comprise: uviol lamp, its inside has inert gas and has an optical window, exciting electrode, be built into the outside of uviol lamp, be used for uviol lamp is applied excitation signal, make the noble gas discharge in the uviol lamp produce ultraviolet light, described ultraviolet light is injected in the described gas compartment by described optical window and the gas in the gas compartment is ionized, passive electrode is built in the described gas compartment, is used for catching the interior Ionized gas electric charge of gas compartment and is converted into current signal, shell is constructed to hold described exciting electrode, uviol lamp, gas compartment.Wherein, described shell and described gas compartment are made of inert material.
According to a further aspect of the invention, ground state stabilizer is constructed to contact the outer wall of described gas compartment, and in 10 minutes just with the temperature stabilization of described gas compartment in described equilibrium temperature scope.
According to a further aspect of the invention, ground state stabilizer is constructed to a positive temperature coefficient thermistor.
According to a further aspect of the invention, be formed with a groove (305) on the outer wall of gas compartment, be used for holding described positive temperature coefficient thermistor, described positive temperature coefficient thermistor is fixed in the described groove and contacts the outer wall of described gas compartment.
According to another aspect of the present invention, ground state stabilizer comprises: heating arrangement is used for gas compartment is heated; Temperature sensor is used for the indoor temperature of probe gas.Wherein, the temperature that heating arrangement is surveyed according to temperature sensor remains on the temperature in the gas compartment in the described equilibrium temperature scope.
According to a further aspect of the invention, be formed with a groove (305) on the outer wall of described gas compartment, be used for holding described heating arrangement and described temperature sensor, described heating arrangement is fixed in the described groove with described temperature sensor and contacts the outer wall of described gas compartment.
According to an aspect of the present invention, provide a kind of gas-chromatography detection system, having comprised: consisted of a gas chromatography detector after chromatographic column and aforesaid photoionization detector, this photoionization detector are connected with described chromatographic column.
According to a further aspect of the invention, proposed a kind of gas-chromatography detection method, having comprised: provide such as aforesaid chromatographic detection system, comprising: driven uviol lamp by exciting electrode and produce the UV photon, the irradiation gas compartment; Start described ground state stabilizer, to the scope of temperature stabilization between 100 degrees centigrade to 150 degrees centigrade of the described gas compartment of major general; Make that isolated discrete group gas to be measured enters gas compartment in the chromatographic column; The discrete group gas to be measured that enters gas compartment is subject to the irradiation of UV light, and photoionization occurs, and produces the ionization electric charge; Use described passive electrode that the ionization charge conversion through ionization in the described gas compartment is current signal; Use described current signal to detect the concentration of described gas.
According to another aspect of the present invention, described temperature stabilization step in 10 minutes just with the temperature stabilization of described gas compartment in described equilibrium temperature scope.
Description of drawings
Reference the following drawings of the present invention is read detailed description hereinafter, and those skilled in the art will more obviously be familiar with and understand above and other objects of the present invention and advantage.Wherein:
Fig. 1 shows the sectional view of traditional PID;
Fig. 2 shows the decomposition diagram of PID element according to an embodiment of the invention;
Fig. 3 shows the structural drawing of ground state stabilizer according to an embodiment of the invention;
Fig. 4 shows the topology view of gas-chromatography detection system according to an embodiment of the invention;
Fig. 5 shows the operation steps process flow diagram that uses gas-chromatography detection method according to an embodiment of the invention;
Fig. 6 shows and uses PID element according to an embodiment of the invention at heating and the correlation curve figure that does not heat the signal that obtains of measuring in two kinds of situations.
Embodiment
Fig. 2 is the decomposition diagram of PID element 200 according to an embodiment of the invention.As shown in Figure 2, ultraviolet (UV) lamp 202 can comprise a sealing fluorescent tube 208, and sealing fluorescent tube 208 is preferably made by glass.Fluorescent tube 208 contains the mixed gas that is comprised of several inert gas.Such as, but not limited to, mixed gas comprises 40% helium, 30% argon gas and 30% Krypton under the air pressure of 25 holders (torr).The size of fluorescent tube 208 can be formulated as required.According to one embodiment of the present of invention, it is the 0.25-0.5 inch that fluorescent tube 208 can be manufactured to diameter, and length is 0.5-1.50 inches, but is not limited to these sizes.Optical window 204 be positioned at fluorescent tube 208 towards gas compartment 206 1 ends.For example, optical window 204 can be by monocrystal material, such as lithium fluoride (LiF), magnesium fluoride (MgF
2), calcium fluoride (CaF
2) or barium fluoride (BaF
2) etc. material make, the UV photon that these optical window materials allow respectively to be lower than 11.7eV, 10.6eV, 9.8eV and 9.2eV energy sees through.
Place an exciting electrode 212 in UV lamp 202 peripheries.Exciting electrode 212 can be made by copper sheet.Outside lamp drive circuit provides excitation signal to exciting electrode 212.For example, can provide a frequency to be about 100kHz, voltage is about the AC signal of 650-1250V.So, in fluorescent tube, produce a highfield, of the inert gas ionization in the fluorescent tube is become electronics and ion.Then, electronics and again combination of ion in the fluorescent tube produce the UV photon.This process is called glow discharge.United States Patent (USP) 5,773,883 have description to this process.United States Patent (USP) 5,773,883 have transferred the application's applicant, and its content is included in this by reference.Based on the different choice to the material of optical window 204, the UV photon with certain particular level can pass through optical window 204.Microprocessor 46 can be regulated the high-voltage signal that is applied on the exciting electrode 212, regulates the ultraviolet light intensity of UV lamp 202 with this.Microprocessor 46 can also be used for making the energy consumption of UV lamp 202 minimum, United States Patent (USP) 6,225, and 633 have description to this process.United States Patent (USP) 6,225,633 have transferred the application's applicant, and its content is included in this by reference.
Passive electrode 220 is positioned at gas compartment 206, is used for collecting electronics and the ion that produces through ionization.Passive electrode 220 is avoided the direct irradiation of UV light, to reduce base flow and noise.Passive electrode 220 comprises pair of electrodes at least: bias electrode and potential electrode.Bias electrode and potential electrode can also can be linear or stepped appearance in the form of sheets, and can be arranged to interdigital structure.Bias electrode and potential electrode can be made by various metals and alloy, are preferably made by stainless steel.
Bias electrode provides positive bias voltage, for example, and the dc voltage of about 4-300V.So bias electrode repels the positive ion that photoionization produces.Potential electrode is close to ground voltage, and separates with bias electrode, therefore forms a bias field between bias electrode and potential electrode.Potential electrode absorbs positive ion, produces to measure electric current.Externally measured circuit links to each other with potential electrode, and measures the electric current that produces by collecting positive ion, this electric current is amplified, and therefrom calculate the concentration of to be measured group of gas.
In the PID200 according to the embodiment of the invention, exciting electrode 212, uviol lamp 202 and gas compartment 206 all are accommodated in the shell 230.Gas compartment 206 and shell 230 are made of the inert material such as special fluorine jade for asking rain material.
Be outside equipped with ground state stabilizer 210 used in the present invention at gas compartment 206.Ground state stabilizer 210 can be built into the place near gas compartment 206.In preferred embodiment first, ground state stabilizer is constructed to contact with the outer wall of gas compartment 206.
The first a kind of better implementation structure 300 of the ground state stabilizer 210 of exemplary embodiment has been shown among Fig. 3 according to the present invention.In Fig. 3, ground state stabilizer is constructed to a positive temperature coefficient thermistor PTC310, and heater circuit is drawn at two ends.Outer wall at gas compartment 206 digs a groove (305), and its size is consistent with PTC310, is used for holding PTC310.PTC310 is fixed in this groove and with the outer wall of gas compartment 206 contacts, so that gas compartment 206 is heated.When temperature reaches a predetermined upper PTC310 in limited time stopped heating that opens circuit.Descend gradually after the temperature of gas compartment 206, when temperature was reduced to a predetermined lower bound, PTC310 again was communicated with and begins heating, until reach the predetermined upper limit of temperature.Thus, PTC310 remains on the temperature of gas compartment 206 within the preset range.Should predetermined range of stability can preset by the external command input.
In addition, according to another implementation structure of ground state stabilizer 210 of the present invention.PTC310 can be replaced with other the parts with similar functions, for example, use the unitized construction of a heating arrangement and temperature sensor.Heating arrangement can adopt variety of way to construct, and such as solid state heater, heating tape, radiation heater, is used for whole gas compartment 206 is heated.Temperature sensor is the temperature survey electric current for the temperature in the probe gas chamber 206 and with the temperature transition of surveying.With aforementioned PTC
310 similar ground, heating arrangement and temperature sensor can be placed on the place near gas compartment 206.Preferably, heating arrangement can contact with the outer wall of gas compartment 206 with temperature sensor.According to first preferred embodiment of the present invention, dig out a groove at gas compartment 206 outer walls, with heating arrangement with contact in temperature sensor is fixed on groove and with the outer wall of gas compartment, simultaneously, also can comprise a temperature controller in photoionization detector PID outside.Temperature sensor is sent to temperature sensor with the temperature survey electric current.Temperature controller is regulated heating arrangement according to the gas compartment 206 interior temperature of surveying, thereby the temperature in the gas compartment 206 is remained in the temperature range of being scheduled to.And temperature controller can be accepted outside instruction input, and the heating-up temperature scope of gas compartment 206 is preset.
The ground state stabilizer 210 of constructing according to various embodiments of the present invention from the above mentioned, can both and remain in the constant scope the temperature increase in the gas compartment 206.This scope can be but be not limited to, 100 degrees centigrade to 150 degrees centigrade.Research according to the inventor finds that the temperature of adjusting in the gas compartment can change signal to noise ratio (S/N ratio) and the sensitivity of measuring electric current effectively.Fig. 6 shows PID detecting device heating and when not heating, the response of the detected gas of same concentration.In Fig. 6, what X-axis represented is the concentration of to be measured group of gas, and unit is ppb.Y-axis represents to measure the indicated gas peak area of electric current, and the size of gas peak area is directly proportional with the signal intensity of measuring electric current.Slotted line A is illustrated in and has used gas concentration current signal detected when being heated to 100-150 degrees centigrade of scopes after the ground state stabilizer 210 of the present invention.The PID that slotted line B represents to use prior art detected gas concentration current signal when not carrying out inner heating.As seen, when the temperature in the gas compartment remains between 100 degrees centigrade to 150 degrees centigrade, each concentration value of gas to be measured measure the gas peak area value can reach when not adding thermal measurement 1.4～1.6 times.That is the signal intensity of the measurement electric current that, obtains is 1.4～1.6 times when not heating mutually.This has just significantly improved signal to noise ratio (S/N ratio) and the sensitivity of measuring electric current.
Simultaneously, ground state stabilizer 210 can be at short notice with the temperature increase of gas compartment 206 to this preset range.According to exemplary embodiment of the present invention, startup ground state stabilizer 210 only after 10 minutes, just can make the temperature in the gas compartment 206 remain on 100 degrees centigrade-150 degrees centigrade scope.The present inventor finds, the temperature of gas compartment 206 inside is stabilized in the baseline that just can stablize rapidly detected measurement electric current in the particular range as soon as possible, and this has shortened the starting-up response time of PID200 greatly.
In addition, ground state stabilizer 210 also is used for the escaping gas to be measured that enters gas compartment 206 is carried out dehumidification treatments.Under some use occasion, the gas to be measured that enters has higher humidity, easily in the optical window 204 of uviol lamp 202 phenomenon of condensing.This will hinder the UV photon and enter gas compartment 206, and produce a small amount of leakage current at passive electrode.This has just produced adverse effect to the accuracy of measuring electric current.By the heat tracing of ground state stabilizer, can reach the effect on moisture extraction to gas compartment inside, this effectively eliminates above-mentioned adverse effect and helps to obtain more accurately measured value.
In addition, the applicant also finds, when the temperature of gas compartment 206 inside is in a particular range, can increase significantly the measurement current value that light concentration gas produces, thereby effectively enlarged the gas concentration scope that whole PID200 can detect, the concentration that has reduced gas to be measured detects lower limit.
As shown in Figure 4, according to first preferred embodiment of the present invention, photoionization detector PID200 from the above mentioned can link to each other with a chromatographic column and other parts and consist of a gas-chromatography detection system 400.At optional features such as the peripheral connectable light power supply of PID200, heating power supplies.Enter in the gas compartment 206 of PID200 from the isolated discrete group gas to be measured of chromatographic column, gas compartment 206 is stabilized in certain temperature range through the control of ground state stabilizer.Detected gas concentration measurement electric current enters data acquisition equipment after by amplifier, and simultaneously, the photoelectricity intensity after the opto-electronic conversion of UV lamp also is transfused to data acquisition equipment.Because the gas concentration measurement electric current of measuring gained is proportional to the product of gas concentration to be measured and UV light intensity, after data acquisition equipment obtains the data of gas concentration measurement electric current and UV photoelectricity intensity, can in computing machine, calculate the concentration value of gas to be measured.
The below describes in detail with reference to Fig. 5 and uses this chromatographic detector to carry out the concrete steps of volatile organic compounds measurement of concetration.
At first, in step S1, drive uviol lamp 202 by exciting electrode 212 and produce the glow discharge phenomenon, the UV photon is shone gas compartment 206 by optical window 204;
Simultaneously, in step S2, start ground state stabilizer 210, the temperature of beginning lift gas chamber 206 is until predefined scope and all the time temperature is remained on this preset range in follow-up treatment step, according to the application's exemplary embodiment, this preset range can be 100 degrees centigrade-150 degrees centigrade.At this moment, heating process has the effect of dehumidifying simultaneously to gas compartment 206, comprises that the optical window 204 to passive electrode 220 and uviol lamp 202 dehumidifies.
Next, in step S3, enter gas compartment 206 by isolated discrete group gas to be measured in the chromatographic column;
The discrete group gas to be measured that enters gas compartment 206 is subject to the irradiation of UV light, and photoionization occurs, and produces ionization electric charge (step S4);
Then in step S5, use passive electrode 220 to catch electronics and the ion that the gas photoion produces, absorb positive ion by the potential electrode on the passive electrode 220, produce and measure electric current.This measurement electric current is transfused in the outside metering circuit, and the intensity of measuring electric current is proportional to the product of the UV light intensity that gas compartment 206 interior gas concentrations to be measured and uviol lamp 202 send;
Processing enters step S6, and the measurement current signal that externally measured circuit is received amplifies, and when the UV light intensity is constant, can be scaled according to this current signal the concentration of gas composition to be measured.
Although more than described preferred embodiment of the present invention, the present invention is not limited only to this.Those skilled in the art can carry out various variations and change on basis described above.For example, passive electrode can be configured to catch electronics but not the seizure ion, and, one or more potential electrode can be used.In addition, the positive temperature coefficient thermistor PTC of various shapes be can use, strip, band shape, plate-like included but not limited to, etc.Ground state stabilizer can be positioned over other position of gas compartment outer wall.The modification of all these changes is for being apparent the those skilled in the art after instructions of the present invention is benefited.Do not break away from the various changes of spirit of the present invention and change and all should drop within protection scope of the present invention.Protection scope of the present invention is limited by accompanying claims, can make a change in scope described here.
Claims (10)
1. a photoionization detector (200) comprising: shell (230), wherein take in the passive electrode in uviol lamp, exciting electrode, gas compartment and the gas compartment;
Described gas compartment (206) is configured to allow inflow and the outflow of gas;
It is characterized in that: also comprise:
Ground state stabilizer (210) is configured near described gas compartment, and is configured in the equilibrium temperature scope of temperature stabilization between 100 degrees centigrade to 150 degrees centigrade to the described gas compartment of major general.
2. photoionization detector as claimed in claim 1 is characterized in that, described ground state stabilizer is constructed to contact the outer wall of described gas compartment, and in 10 minutes just with the temperature stabilization of described gas compartment in described equilibrium temperature scope.
3. photoionization detector as claimed in claim 1 or 2 is characterized in that, described ground state stabilizer is constructed to a positive temperature coefficient thermistor (310).
4. photoionization detector as claimed in claim 3, it is characterized in that, be formed with a groove (305) on the outer wall of described gas compartment, be used for holding described positive temperature coefficient thermistor, described positive temperature coefficient thermistor is fixed in the described groove and contacts the outer wall of described gas compartment.
5. photoionization detector as claimed in claim 1 or 2 is characterized in that, described ground state stabilizer comprises:
Heating arrangement is used for gas compartment is heated;
Temperature sensor is used for the indoor temperature of probe gas;
Wherein, the temperature that described heating arrangement is surveyed according to described temperature sensor remains on the temperature in the gas compartment in the described equilibrium temperature scope.
6. photoionization detector as claimed in claim 5, it is characterized in that, be formed with a groove (305) on the outer wall of described gas compartment, be used for holding described heating arrangement and described temperature sensor, described heating arrangement is fixed in the described groove with described temperature sensor and contacts the outer wall of described gas compartment.
7. such as claim 4 or 6 described photoionization detectors, it is characterized in that:
Described uviol lamp (202) inside has inert gas and has an optical window (204);
Described exciting electrode (212) is placed on the outside of uviol lamp, be used for uviol lamp is applied excitation signal, make the noble gas discharge in the uviol lamp produce ultraviolet light, described ultraviolet light is injected in the described gas compartment by described optical window and the gas in the gas compartment is ionized;
Described passive electrode (220) is built in the described gas compartment, is used for catching the interior Ionized gas electric charge of gas compartment and is converted into current signal;
Wherein, described shell (230) is constructed to hold described exciting electrode, uviol lamp, gas compartment;
Wherein, described shell and described gas compartment are made of inert material.
8. a gas-chromatography detection system (400) comprising:
Chromatographic column;
Such as the described photoionization detector of any one among the claim 1-7, described photoionization detector consists of a gas chromatography detector after being connected to described chromatographic column.
9. gas-chromatography detection method comprises:
Chromatographic detection system as claimed in claim 8 is provided;
Drive uviol lamp by exciting electrode and produce the UV photon, the irradiation gas compartment;
Start described ground state stabilizer, to the scope of temperature stabilization between 100 degrees centigrade to 150 degrees centigrade of the described gas compartment of major general;
Make that isolated discrete group gas to be measured enters gas compartment in the chromatographic column;
The discrete group gas to be measured that enters gas compartment is subject to the irradiation of UV light, and photoionization occurs, and produces the ionization electric charge;
Use described passive electrode that the ionization charge conversion through ionization in the described gas compartment is current signal;
Use described current signal to detect the concentration of described gas.
10. method as claimed in claim 9 is characterized in that, described temperature stabilization step in 10 minutes just with the temperature stabilization of described gas compartment in described equilibrium temperature scope.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102662018A (en) * | 2010-11-30 | 2012-09-12 | 中国科学院大连化学物理研究所 | Photo ionization detector |
| CN102072945A (en) * | 2010-12-20 | 2011-05-25 | 上海精密科学仪器有限公司 | Chromatographic photoionization detector |
| CN102324371B (en) * | 2011-08-30 | 2013-12-25 | 中北大学 | Ionization chamber of photoionization gas detecting instrument based on printed circuit board process |
| CN103424465B (en) * | 2013-07-26 | 2016-05-18 | 华瑞科学仪器(上海)有限公司 | Intelligent PID sensor assembly |
| CN105158325A (en) * | 2015-07-30 | 2015-12-16 | 安徽中杰信息科技有限公司 | Photoionization detector |
| CN105136992B (en) * | 2015-09-15 | 2017-01-25 | 顾金华 | VOC (Volatile Organic Compound) concentration online monitoring device and VOC concentration online monitoring method thereof |
| CN105527335A (en) * | 2016-02-02 | 2016-04-27 | 中国科学院电子学研究所 | Photoionization detector |
| US11193909B2 (en) | 2016-08-09 | 2021-12-07 | Honeywell International Inc. | Low power photoionization detector (PID) |
| US10718738B2 (en) * | 2016-08-24 | 2020-07-21 | The Regents Of The University Of Michigan | Miniaturized discharge photo-ionization detector |
| WO2018112732A1 (en) * | 2016-12-20 | 2018-06-28 | Honeywell International Inc. | Collection surface for electrodes in photoionization detector |
| US10942061B2 (en) | 2016-12-20 | 2021-03-09 | Honeywell International Inc. | Shielding for electrodes in photoionization detector |
| CN111855850A (en) * | 2020-07-17 | 2020-10-30 | 汉威科技集团股份有限公司 | Portable photoionization detector and micro-chromatography and photoionization detection system |
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