CN102262061A - Method and device for detecting concentration of chlorine dioxide gas on line - Google Patents
Method and device for detecting concentration of chlorine dioxide gas on line Download PDFInfo
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- CN102262061A CN102262061A CN 201110104758 CN201110104758A CN102262061A CN 102262061 A CN102262061 A CN 102262061A CN 201110104758 CN201110104758 CN 201110104758 CN 201110104758 A CN201110104758 A CN 201110104758A CN 102262061 A CN102262061 A CN 102262061A
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Abstract
The invention discloses a method and a device for detecting the concentration of chlorine dioxide gas on line in real time. In the device, centers of a light source, a collimation lens, a beam splitter, a gas chamber, a detection focusing lens and a detection probe are arranged on the same horizontal plane sequentially; the beam splitter forms an angle of 45 degrees with an incident parallel light ray; a reference focusing lens and a reference probe are arranged below the beam splitter sequentially; a gas inlet and a gas outlet are formed on the upper surface and the lower surface of the gas chamber respectively; a light source driving circuit is connected with the light source; a signal processing circuit is connected with the reference probe, the detection probe and an analog-to-digital conversion circuit respectively; and a control unit is connected with the analog-to-digital conversion circuit, the light source driving circuit and an auxiliary function unit respectively. In the method, mixed gas to be detected which contains the chlorine dioxide gas directionally flows through the gas chamber from the gas inlet to the gas outlet under the action of external power; and the concentration of the chlorine dioxide gas can be obtained through signal transmission and calculation of the device. By the method and the device, online continuous detection can be realized; and the concentration detection range is from PPM level to mg/L level.
Description
Technical field
The present invention relates to the gas concentration detection range, be specifically related to a kind of method and apparatus of online detection chlorine dioxide gas concentration.
Background technology
Chlorine dioxide is unique high-efficiency sterilizing and disinfecting agent in the chlorine-containing disinfectant of generally acknowledging in the world, and is registered as sanitizer in 1998 by Environmental Protection Agency.The experiment proved that, chlorine dioxide sterilization have wide spectrum, efficient, fast, do not have and three cause the characteristic of (carcinogenic, teratogenesis, mutagenesis), be mainly used in fields such as space disinfection, water treatment, fruit freshness preserving.
When using the chlorine dioxide sterilization, emphasize that its concentration will keep could guaranteeing Disinfection Effect within the specific limits, therefore need a kind of chlorine dioxide gas concentration pick-up unit, detect, feed back, control the concentration of chlorine dioxide in real time.The transmitter or the detector that can be used for detecting chlorine dioxide gas concentration in the market mainly are core with the electrochemical sensor.There is following problems in electrochemical sensor: range is little, and maximum detectable concentration is 100PPM; Life-span is short, and MaLS has only 2 years; Not being suitable for on-line continuous detects; May cause sensor failure during outrange.Domestic scholars Zhou Deping etc. have proposed a kind of online test method of high concentration of chlorine dioxide gas, but this method not only needs integrated spectrophotometer, and need the very complicated water route of design, and chlorine dioxide has loss in testing process.
Summary of the invention
Problem to be solved by this invention is, overcomes the shortcoming and defect of prior art, and a kind of method and apparatus that can online in real time detects chlorine dioxide gas concentration is provided.
The present invention is achieved by adopting following technical proposals:
A kind of method of online detection chlorine dioxide gas concentration is characterized in that may further comprise the steps:
A. the mixed gas that contains chlorine dioxide to be measured is externally crossed air chamber by gas access to gas vent oriented flow under the effect of power;
B. control module is by the pulse of output port to the certain dutycycle of light source driving circuit output some cycles;
C. light source driving circuit driving light source;
D. the light that sends of light source is converted into approximate parallel rays by collimation lens;
E. converge at reference detector through the reference condenser lens after the reflection of a parallel rays process spectroscope part and induce reference signal, converge at the detection detector through the detection condenser lens again through air chamber after another part transmission and induce detection signal;
F. after detection signal and reference signal are carried out current-voltage conversion, amplification and filtering by signal processing circuit, be converted to digital signal through analog to digital conversion circuit again;
G. control module reads the row operation of going forward side by side of above-mentioned digital signal and obtains the concentration of chlorine dioxide.
In said method, light source can adopt 365nm arrowband ultraviolet light-emitting diode (UVLED), and the emission spectrum scope is 360-370nm.
In said method, the described some cycles of step B is 2～5 seconds, and dutycycle is set to initial 50 milliseconds of conductings in each cycle and shutoff excess time.
In said method, collimation lens, spectroscope, be the ultraviolet fused quartz with reference to condenser lens, the material that detects condenser lens.
In said method, reference detector and detection detector are the photodiode to 365nm ultraviolet light sensitivity.
In said method, the ratio of spectroscopical transmission and reflection is 50/50-90/10, becomes 45 degree to install with the parallel rays of incident.
The present invention also comprises a kind of device of online detection chlorine dioxide gas concentration, by light source, collimation lens, spectroscope, air chamber, with reference to condenser lens, detect condenser lens, reference detector, detection detector, light source driving circuit, signal processing circuit, analog to digital conversion circuit, control module and subsidiary function unit and form; The center of described light source, collimation lens, spectroscope, air chamber, detection condenser lens and detection detector is arranged in order at same surface level, described spectroscope becomes 45 degree to install with the parallel rays of incident, the spectroscope below sets gradually with reference to condenser lens and reference detector, and the upper and lower surface of described air chamber is provided with gas feed and gas vent respectively; Light source driving circuit connects light source, and signal processing circuit connects reference detector respectively, detects detector and analog to digital conversion circuit, and control module connects analog to digital conversion circuit, light source driving circuit and subsidiary function unit respectively.
Described air chamber cavity is the material of acid corrosion-resistant, can be Polyvinylchloride (PVC) or stainless steel.
Air chamber is established gas access and gas vent, and optical window is established at two ends.
The optical window of the every end of air chamber is made up of two parts, and the part that contacts with gas to be measured is the PET film, and Outboard Sections is the window of sapphire or ultraviolet fused quartz material.
Can be with light source, collimation lens, spectroscope, air chamber, with reference to condenser lens, detect the integral type detector that condenser lens, reference detector and detection detector are integrated into sealing, make light that light source sends in the path of a sealing, not influenced by extraneous light.
With light source driving circuit, signal processing circuit, analog to digital conversion circuit, control module and the subsidiary function collection of units formula control module that becomes one.
Storage, the demonstration of testing result realized in the subsidiary function unit, keyboard response, and output is sent in serial communication and change.
Compared with prior art, the present invention adopts absorption photometry to detect the concentration of chlorine dioxide, can on-line continuous detect, and the concentration sensing range can be from the PPM level to the mg/L level, and can be integrated in the smaller volume.The present invention uses the narrow-band LED device as light source, compares with conventional light source such as deuterium lamp, has prolonged the life-span on the one hand, has omitted optical filter on the other hand, has simplified light path.The present invention adopts and detects the detection error that causes with the fluctuation of eliminating light source with reference to the double light path method.In order to reduce the detection error that the photochmeical reaction of chlorine dioxide in air chamber causes, one aspect of the present invention adopts pulse mode driving LED light source, reduce the photochmeical reaction time, use the part of PET film on the other hand, reduce chlorine dioxide photochmeical reaction product to the corrosion of optical window with attach as the air chamber optical window.
Description of drawings
Fig. 1 is a light path principle figure of the present invention;
Fig. 2 is the block diagram that device of the present invention constitutes.
Embodiment
Below in conjunction with drawings and Examples the present invention is described further.
See figures.1.and.2, implement the method for a kind of online detection chlorine dioxide gas concentration of the present invention, said method comprising the steps of:
A. the mixed gas that contains chlorine dioxide to be measured is externally crossed air chamber 7 by gas access 6 to gas vent 12 oriented flows under the effect of power;
C. light source driving circuit 15 driving light sources 1;
D. the light that sends of light source 1 is crossed collimation lens 2 and is converted into approximate parallel rays;
E. converge at reference detector 14 through reference condenser lens 13 after parallel rays reflects through spectroscope 3 back parts and induce reference signal, through air chamber 7, converge at detection detector 11 through detection condenser lens 10 again and induce detection signal after another part transmission;
F. after detection signal and reference signal are carried out current-voltage conversion, amplification and filtering by signal processing circuit 17, be converted to digital signal through analog to digital conversion circuit 18 again;
In said method, light source 1 adopts 365nm arrowband ultraviolet light-emitting diode (UVLED), and the emission spectrum scope is 360-370nm.
In said method, the described some cycles of step B is 4 seconds, and dutycycle is set to initial 50 milliseconds of conductings in each cycle and shutoff excess time.
In said method, described collimation lens 2, spectroscope 3, detect condenser lens 10, be the ultraviolet fused quartz with reference to the material of condenser lens 13.
In said method, reference detector 14 and detection detector 11 are the photodiode to 365nm ultraviolet light sensitivity.
In said method, the transmission of described spectroscope 3 and the ratio of reflection are 50/50-90/10, become 45 degree to install with the parallel rays of incident.
The present invention can also further implement by following technical scheme:
As depicted in figs. 1 and 2, a kind of device of online detection chlorine dioxide gas concentration, comprise light source 1, collimation lens 2, spectroscope 3, air chamber 7, with reference to condenser lens 13, detect condenser lens 10, reference detector 14, detect detector 11, light source driving circuit 15, signal processing circuit 17, analog to digital conversion circuit 18, control module 16 and subsidiary function single 19; The center of described light source, collimation lens, spectroscope, air chamber, detection condenser lens and detection detector is arranged in order at same surface level, described spectroscope becomes 45 degree to install with the parallel rays of incident, the spectroscope below sets gradually with reference to condenser lens and reference detector, and the upper and lower surface of described air chamber is provided with gas feed and gas vent respectively; Light source driving circuit connects light source, and signal processing circuit connects reference detector respectively, detects detector and analog to digital conversion circuit, and control module connects analog to digital conversion circuit, light source driving circuit and subsidiary function unit respectively.Light source 1 provides driving by the light source driving circuit 15 of control module 16 controls; The light that light source 1 sends is converted into approximate directional light through collimation lens 2; Converge at reference detector 14 through reference condenser lens 13 after parallel rays reflects through spectroscope 3 back parts and induce reference signal, through air chamber 7, converge at detection detector 11 through detection condenser lens 10 again and induce detection signal after another part transmission; Detection signal and reference signal are converted to digital signal through analog to digital conversion circuit 18 after carrying out current-voltage conversion, amplification and filtering by signal processing circuit 17 again; Control module 16 reads the row operation of going forward side by side of above-mentioned digital signal and obtains the concentration of chlorine dioxide.
In the most preferred embodiment of the present invention, air chamber 7 cavitys adopt PVC to be processed into.
In the most preferred embodiment of the present invention, the optical window of air chamber 7 is made up of two parts, and the part that contacts with gas to be measured is PET film 5 and 8, and Outboard Sections is the window 4 and 9 of sapphire or ultraviolet fused quartz material.
Most preferred embodiment of the present invention with light source 1, collimation lens 2, spectroscope 3, air chamber 7, with reference to condenser lens 13, detect condenser lens 10, reference detector 14, detect the integral type detector 40 that detector 11 is integrated into sealing, make light that light source 1 sends in the path of a sealing, not influenced by extraneous light.
Most preferred embodiment of the present invention is with light source driving circuit 15, signal processing circuit 17, analog to digital conversion circuit 18, control module 16 and the subsidiary function unit 19 formula control module 50 that becomes one.
In the most preferred embodiment of the present invention, light source driving circuit 15 adopts the LED chip for driving LT3950 of Infineon, in other embodiments, can adopt constant current source chip or LED Linear Driving chip, as LT3092 or CAT4008 etc.
In the most preferred embodiment of the present invention, control module 16 is a core with the enhancement mode 51 single-chip microcomputer P89LPC935 that think the intelligence Pu, in other embodiments, can adopt single-chip microcomputers such as PIC, AVR or ARM.
In the most preferred embodiment of the present invention, the operational amplifier chip OPA129 of low bias current is adopted in the first order current-voltage conversion of signal processing circuit 17.
In the most preferred embodiment of the present invention, the analog to digital converter of analog to digital conversion circuit 18 adopts the AD7942 of 14 bit resolutions, and in other embodiments, can adopt resolution is 12 or 16 s' converter.
Most preferred embodiment of the present invention comprises subsidiary function unit 19, realizes storage, the demonstration of testing result, keyboard response, and output is sent in serial communication and change.
Principle of work of the present invention is as described below: situations such as the wavelength of material molecule absorption spectrum, intensity, polarization state, with the architectural feature of this material intrinsic relation is arranged, by the degree of absorption of detected gas, just can determine the composition and the concentration of gas to special wavelength light.Gas absorption satisfies Lambert-Beer's law:
I(v)＝I
0(v)·e
-α(v)LC
In the formula, v is the frequency of light wave, I
0(v) and I (v) be respectively input light intensity and output intensity before and after the gas absorption, α (the v) absorption coefficient of frequency v place gas, C is a gas concentration, L is that gas absorption has light path.
If use the light of characteristic frequency, and suppose that the light intensity of light emitted is stable, then α (v), I
0(v) all are constants, L also is a constant again, so, I (v) with tested gas concentration C for one to one the relation.Therefore, when detecting, (value v) just can (v) calculate the concentration C of tested gas according to the I that timing signal is formulated with the relation curve of C as long as detection obtains I.
Because the temperature characterisitic of light source and light source driving circuit element, the light intensity of light emitted is not stablized constant, can have influence on the accuracy of testing result.For this reason, design a reference path, obtain the light intensity I ' of light before entering the gas absorption path
0(v), utilize I (v) and I '
0(ratio v) and the relation curve of C calculate the concentration C of tested gas.Utilize the method for above-mentioned double light path can eliminate the measuring error that light source fluctuation brings substantially.
Faradic size by the measuring light electric diode is reacted light intensity value, and induction current carries out current-voltage conversion, amplification, filtering through signal processing circuit, and this process all adopts low noise operational amplifier to reduce error.Filtered voltage signal is sent into control module through 14 high-precision adc conversionization digital signals.It is core that control module adopts enhancing 51 single-chip microcomputers of thinking the intelligence Pu, and the relation curve that solidifies according to timing signal calculates the concentration that obtains chlorine dioxide.There is result of calculation in the storage of this machine in control module, shows by charactron or liquid crystal display, transmits by the RS232 communication port, is converted to the standard industry simulating signal of 4-20mA by transmission circuit.Also functions such as extended keyboard response again, printing as a result.
Claims (10)
1. the method for an online detection chlorine dioxide gas concentration is characterized in that, following steps is installed carries out:
A. the mixed gas that contains chlorine dioxide to be measured is externally crossed air chamber by gas access to gas vent oriented flow under the effect of power;
B. control module is by the pulse of output port to the certain dutycycle of light source driving circuit output some cycles;
C. light source driving circuit driving light source;
D. the light that sends of light source is crossed collimation lens and is converted into approximate parallel rays;
E. converge at reference detector through the reference condenser lens after the part reflection behind the parallel rays process spectroscope and induce reference signal, through air chamber, converge at the detection detector through the detection condenser lens again and induce detection signal after another part transmission;
F. after detection signal and reference signal are carried out current-voltage conversion, amplification and filtering by signal processing circuit, be converted to digital signal through analog to digital conversion circuit again;
G. control module reads the row operation of going forward side by side of above-mentioned digital signal and obtains the concentration of chlorine dioxide.
2. the method for a kind of online detection chlorine dioxide gas concentration according to claim 1 is characterized in that: described light source adopts 365nm arrowband ultraviolet light-emitting diode, and the emission spectrum scope is 360-370nm.
3. the method for a kind of online detection chlorine dioxide gas concentration according to claim 1 is characterized in that: the described some cycles of step B is 2～5 seconds, and dutycycle is set to initial 50 milliseconds of conductings in each cycle and shutoff excess time.
4. the method for a kind of online detection chlorine dioxide gas concentration according to claim 1 is characterized in that: described collimation lens, spectroscope, detection condenser lens and be the ultraviolet fused quartz with reference to the material of condenser lens.
5. the method for a kind of online detection chlorine dioxide gas concentration according to claim 1 is characterized in that: described reference detector and detection detector are the photodiode to 365nm ultraviolet light sensitivity.
6. the device of an online detection chlorine dioxide gas concentration is characterized in that: by light source, collimation lens, spectroscope, air chamber, detection condenser lens, form with reference to condenser lens, reference detector, detection detector, light source driving circuit, signal processing circuit, analog to digital conversion circuit, control module and subsidiary function unit; The center of described light source, collimation lens, spectroscope, air chamber, detection condenser lens and detection detector is arranged in order at same surface level, described spectroscope becomes 45 degree to install with the parallel rays of incident, the spectroscope below sets gradually with reference to condenser lens and reference detector, and the upper and lower surface of described air chamber is provided with gas feed and gas vent respectively; Light source driving circuit connects light source, and signal processing circuit connects reference detector respectively, detects detector and analog to digital conversion circuit, and control module connects analog to digital conversion circuit, light source driving circuit and subsidiary function unit respectively.
7. the device of a kind of online detection chlorine dioxide gas concentration according to claim 6 is characterized in that: described air chamber cavity is the material of acid corrosion-resistant, adopts Polyvinylchloride or stainless steel.
8. the device of a kind of online detection chlorine dioxide gas concentration according to claim 6, it is characterized in that: optical window is established at described air chamber two ends, described optical window is made up of two parts, the part that contacts with gas to be measured is the PET film, and Outboard Sections is the window of sapphire or ultraviolet fused quartz material.
9. the device of a kind of online detection chlorine dioxide gas concentration according to claim 6 is characterized in that: described light source, collimation lens, spectroscope, air chamber, with reference to condenser lens, detect the integral type detector that condenser lens, reference detector and detection detector are integrated into sealing.
10. the device of a kind of online detection chlorine dioxide gas concentration according to claim 6 is characterized in that: described light source driving circuit, signal processing circuit, analog to digital conversion circuit, control module and the subsidiary function collection of units formula control module that becomes one.
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| CN103645146A (en) * | 2013-11-16 | 2014-03-19 | 中山欧麦克仪器设备有限公司 | Chlorine dioxide detection device |
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| CN113406023A (en) * | 2021-05-24 | 2021-09-17 | 哈尔滨工程大学 | Natural gas combustible gas component concentration on-line measuring device |
| CN114112963A (en) * | 2021-11-30 | 2022-03-01 | 青岛崂应海纳光电环保集团有限公司 | Gas telemetering telescope |
| CN114577747A (en) * | 2022-04-06 | 2022-06-03 | 青岛云起智能仪器有限公司 | UV Absorption Gas Detector |
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Application publication date: 20111130 |