CN104359949A - Gas concentration measuring method - Google Patents

Gas concentration measuring method Download PDF

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Publication number
CN104359949A
CN104359949A CN201410625877.XA CN201410625877A CN104359949A CN 104359949 A CN104359949 A CN 104359949A CN 201410625877 A CN201410625877 A CN 201410625877A CN 104359949 A CN104359949 A CN 104359949A
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CN
China
Prior art keywords
sensor
measuring
gas concentration
concentration
gas
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CN201410625877.XA
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Chinese (zh)
Inventor
江舫
姚铁明
曾庆杰
唐金华
唐银华
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广州勒夫蔓德电器有限公司
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Priority to CN201410625877.XA priority Critical patent/CN104359949A/en
Publication of CN104359949A publication Critical patent/CN104359949A/en

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Abstract

The invention discloses a gas concentration measuring method which is used for solving the problems of complex steps, inconvenience in operation and low precision of the gas concentration measuring method in the prior art. Based on a measuring system including a heater, a sensor and a potentiometer, the electrical conductivity of the sensor does not change along with the changes of the concentration of the to-be-measured gas in the environment; the heater is used for heating the sensor, and the sensor is in series connected with the potentiometer. The gas concentration measuring method comprises the following steps: S1. regulating the output voltage of the potentiometer to be in a range of 0.5V-1V after the heater works for 1-3 hours; S2. arranging the measuring system in a clean air environment, and recording the output voltage value V0 and the environment temperature value T0 of the sensor after stably electrifying for 5-20 minutes; S3. arranging the measuring system in a to-be-measured gas environment, recording the output voltage value V and the environment temperature value T of the sensor after stably electrifying for 5-20 minutes; S4. according to the difference value of the T and the T0, compensating the output voltage of the sensor to V1; and S5. calculating the concentration of the to-be-measured gas according to a formula TC=e<ln(V1/V0)*C>-1, wherein the unit is ppm. According to the gas concentration measuring method disclosed by the invention, the gas concentration measuring steps are simplified, the measuring cost is lowered, the operation is convenient and the precision is high.

Description

A kind of measuring method of gas concentration
Technical field
The present invention relates to gas concentration measurement technology.
Background technology
Gas concentration detection is widely used in combustion gas, oil, chemical industry, metallurgy etc. and there is hazardous area that is inflammable, explosive, poisonous gas, the concentration relationship of factory's pit gas is to the life safety of operating worker, measure gas concentrations can help the producers of factories and miness to make the gas plan that reasonably eliminates danger exactly, makes effective management and control to the potential safety hazard in producing.In addition gas concentration detects and can also be applied to multiple industry such as medical treatment, daily use chemicals.
Under prior art, gas concentration measurement is many based on NDIR (Non-Dispersive Infrared) spectral analysis technique, namely according to gas to be measured to a certain waveband infrared absorption characteristic, select specific band infrared light by tested gas sample, the infrared absorption spectrum that close between the damping capacity of infrared light and tested gas concentration seemingly meets the rich law gas of Bill orchid is made up of the absorption band of a large amount of very sharp-pointed, narrow frequency range, and these absorption bands are the results of moving between vibration-rotational energy level.Adopt said method measure gas concentrations, there is following deficiency: one, spectral analysis technique needs to buy correlation spectroscopy equipment, but this equipment price costly, and common manufacturing enterprise does not possess purchase strength.Two, spectral analysis technique requires higher to the professional standards of measurement of concetration personnel, makes to need to possess comparatively deep optical knowledge in this way, and those of ordinary skill is difficult to operation.Three, adopt said method, measurement result affects comparatively large by gas pressure intensity, the compensation calculation for pressure can cause last measurement result to have relatively large deviation.
Along with the raising day by day of people's living standard, the air quality of people to living environment is also more and more paid attention to.Whether the quality of IAQ (indoor air quality) is related to occupant's health, VOC, ammonia, sulfuretted hydrogen etc. are indoor common dusty gass, to people, room air is improved targetedly to the measurement of this several harmful gas concentration there is good directive significance, but current gas concentration measuring method effectively and accurately can not detect indoor polluted gas mostly, and do not have specific aim, in traditional measuring method, some does not need the gas measured can disturb detection to dusty gas concentration.
Summary of the invention
In order to solve gas concentration measuring method complex steps under prior art, operation inconvenience, precision is not high and easily do not needed the problem of measurement gas interference detection results, the invention discloses a kind of measuring method of gas concentration, which simplify the step of gas concentration measurement, reduce measurement cost, convenient operation and precision is high, can be appropriate evade the interference not needing measurement gas to measurement result.
In order to realize foregoing invention object, the technical solution adopted in the present invention is as follows:
A kind of measuring method of gas concentration, based on a kind of measuring system comprising well heater, sensor and potentiometer, the conductivity of wherein said sensor can change because of the concentration of gas to be measured in environment, and described well heater is used for heating sensor, and described sensor is connected with potentiometer; Comprise the following steps:
The work of S1 well heater is after 1-3 hour, and the output voltage of regulator potentiometer is within the scope of 0.5V-1V;
Measuring system is placed in pure air environment by S2, after 5-20min is stablized in energising, and the output voltage values V of record sensor 0with ambient temperature value T 0;
Measuring system is placed in gaseous environment to be measured by S3, after 5-20min is stablized in energising, and the output voltage values V of record sensor and ambient temperature value T;
S4 is according to T and T 0difference, be V by the output voltage compensation of sensor 1;
S4 is by formula TC=e ln (V1/V0) * C-1 calculates gas concentration to be measured, and unit is ppm.
Preferably, if in gaseous environment to be measured containing concentration TC>0.2ppm do not need measurement gas, stabiloity compensation calculating is carried out to sensor, until gas concentration to be measured is less than or equal to 0.2ppm.
Preferably, if gas concentration amplitude of variation to be measured amplitude of variation within half an hour, more than 0.2ppm, carries out sensitivity compensation calculation to sensor, gas concentration returns to the value before described stabiloity compensation.
Preferably, described stabiloity compensation calculates and takes gas concentration drop by half to be measured per hour, until its concentration value is less than or equal to the step of 0.2ppm.
Preferably, described sensitivity compensation calculation takes the concentration value of increase per minute 0.5 times, until concentration value returns to the step that stabiloity compensation calculates.
Preferably, when drift occurs sensor initial value reference point, by V 1be compensated for as V 2.
Preferably, the time of heating in S1 is 2 hours, and the output voltage of potentiometer is 0.6V-0.8V.
Preferably, in S2, conduction time is 10min.
Preferably, the power-supply unit of described sensor is direct supply.
To sum up, the present invention's beneficial effect that is relative and prior art is:
1, measuring process is simplified, the technical program generally only needs to measure two groups of numerals, one group is voltage in pure air environment and temperature reference value, and another group is voltage in gas to be measured and temperature value, then just can calculate the concentration of gas to be measured according to correlation formula.Relative to prior art, the numerical value of measurement reduces, and calculation procedure simplifies.Require to reduce to survey crew its knowledge attainment, easy to utilize.
2, measure cost low, the measuring system in the technical program is only made up of well heater, sensor and potentiometer three parts, and cost is low, and power consumption is low, compared with the spectral analysis of prior art, saves and measures cost.
3, in the technical program, only need to consider that temperature is on the impact of measurement result, but temperature is comparatively fixing on the impact of conductivity, those skilled in the art can easily calculate its offset, is affected by other factors little, so precision is very high comparatively speaking
4, can be appropriate evade the interference not needing measurement gas to measurement result.When in gaseous environment to be measured containing concentration higher do not need measurement gas time, often understand interference measurement results, therefore recompensing property calculates, and can measure gas actual concentration to be measured exactly.
Accompanying drawing explanation
Fig. 1 is that the present invention debugs process flow diagram;
Fig. 2 is that the present invention measures pure air reference value process flow diagram;
Fig. 3 is that the present invention measures amount of gas value process flow diagram to be measured;
Embodiment
Below in conjunction with the drawings and specific embodiments, the multi-functional cash register platform of the present invention is described further:
The present invention is based on a kind of measuring system comprising well heater, sensor and potentiometer, the conductivity of wherein said sensor can change because of the concentration of gas to be measured in environment, and described well heater is used for heating sensor, and described sensor is connected with potentiometer; This sensor needs applying two voltages; Heater voltage and loop voltage.This heater voltage is in the specified temp adapted with gas to be measured and the integrated well heater applied for maintaining sensor.Loop voltage is then for measuring and the both end voltage on the pull-up resistor of sensor series.This sensor has polarity, so loop voltage needs direct supply.
As long as can meet the electrical requirements of sensor, loop voltage and heater voltage can share same power circuit.In order to by horizontal for decision content optimization, and make the limit value of power consumption lower than 15mW of sensor, need the value selecting pull-up resistor.
Sensor is molecular by responsive element, and responsive sub-prime is the metal-oxide semiconductor (MOS) formed on aluminum oxide substrate, and when gas concentration to be measured in air raises, the conductivity of sensor also raises.Use simple circuit just the change of this conductivity can be transformed to output signal corresponding to gas concentration.With when air cleaning for benchmark, by sensor resistance than having changed the concentration how much detecting air during air cleaner.
A measuring method for gas concentration, comprises the following steps:
The work of S1 well heater is after 2 hours, and the output voltage of regulator potentiometer is within the scope of 0.6V-0.8V; In above voltage range, sensor signal exports best dynamic range.
Measuring system is placed in pure air environment by S2, after 10min is stablized in energising, and the output voltage values V of record sensor 0with ambient temperature value T 0; These two numerical value are the numerical benchmark measuring gas concentration to be measured.
Measuring system is placed in gaseous environment to be measured by S3, after 5-20min is stablized in energising, and the output voltage values V of record sensor and ambient temperature value T;
S4 is according to T and T 0difference, be V by the output voltage compensation of sensor 1; When measure gas to be measured time temperature and reference temperature inconsistent time, voltage compensation to be carried out to it.When drift occurs sensor initial value reference point, by V 1be compensated for as V 2.When sensor service time is longer or when being in for a long time in the higher gas of concentration, the initial value reference point of sensor may change, and will give voltage compensation targetedly.
S5 is by formula TC=e ln (V1/V0) * C-1 calculates gas concentration to be measured, and unit is ppm.
When in gaseous environment to be measured containing concentration higher do not need measurement gas time, often understand interference measurement results, therefore recompensing property calculates, and can measure gas actual concentration to be measured exactly.Such as, the innocuous gas such as the indoor hydrogen higher containing concentration, but measuring system also can measure its concentration, the value that indoor harmful gas concentration is very high will be shown, but in fact, these gases are harmless, do not need to remove, therefore, if indoor air-purification device is opened for a long time, the gas concentration measured still maintains very high numerical value, and this will carry out stabiloity compensation calculating and sensitivity compensation calculation to it.
Preferably, if in gaseous environment to be measured containing concentration TC>0.2ppm do not need measurement gas, stabiloity compensation calculating is carried out to sensor, until gas concentration to be measured is less than or equal to 0.2ppm.Described stabiloity compensation calculates and takes gas concentration drop by half to be measured per hour, until its concentration value is less than or equal to the step of 0.2ppm.Such as gas concentration to be measured is 0.7ppm, within first hour, concentration is reduced to 0.35ppm, is still greater than 0.2ppm; Within the second hour, continue again to be reduced to 0.175ppm, be less than 0.2ppm.Complete stabiloity compensation.
Preferably, if gas concentration amplitude of variation to be measured amplitude of variation within half an hour, more than 0.2ppm, carries out sensitivity compensation calculation to sensor, gas concentration returns to the value before described stabiloity compensation.Described sensitivity compensates the concentration value taking increase per minute 0.5 times, until concentration value returns to the step of stabiloity compensation.It is 0.15ppm that such as stabiloity compensation terminates rear gas concentration, is 0.6ppm, carries out sensitivity compensation to it before stabiloity compensation; Concentration was elevated to 0.3ppm in first minute, within second minute, continues to be elevated to 0.6ppm.Complete sensitivity to compensate.
It should be noted that; by reference to the accompanying drawings embodiments of the present invention are explained in detail above; but invention is not limited to above-mentioned embodiment; in the ken that one skilled in the relevant art possesses; can also make a variety of changes under the prerequisite not departing from present inventive concept, and these distortion all belong to the protection domain of the claims in the present invention.

Claims (9)

1. the measuring method of a gas concentration, based on a kind of measuring system comprising well heater, sensor and potentiometer, the conductivity of wherein said sensor can change because of the concentration of gas to be measured in environment, and described well heater is used for heating sensor, and described sensor is connected with potentiometer; It is characterized in that, comprise the following steps:
The work of S1 well heater is after 1-3 hour, and the output voltage of regulator potentiometer is within the scope of 0.5V-1V;
Measuring system is placed in pure air environment by S2, after 5-20min is stablized in energising, and the output voltage values V of record sensor 0with ambient temperature value T 0;
Measuring system is placed in gaseous environment to be measured by S3, after 5-20min is stablized in energising, and the output voltage values V of record sensor and ambient temperature value T;
S4 is according to T and T 0difference, be V by the output voltage compensation of sensor 1;
S5 is by formula TC=e ln (V1/V0) * C-1 calculates gas concentration to be measured, and unit is ppm.
2. the measuring method of gas concentration as claimed in claim 1, it is characterized in that: if in gaseous environment to be measured containing concentration TC>0.2ppm do not need measurement gas, stabiloity compensation calculating is carried out to sensor, until gas concentration to be measured is less than or equal to 0.2ppm.
3. the measuring method of gas concentration as claimed in claim 2, it is characterized in that: if gas concentration amplitude of variation to be measured within half an hour amplitude of variation more than 0.2ppm, carry out sensitivity compensation calculation to sensor, gas concentration returns to the value before described stabiloity compensation.
4. the measuring method of gas concentration as claimed in claim 2, is characterized in that: described stabiloity compensation calculates and takes gas concentration drop by half to be measured per hour, until its concentration value is less than or equal to the step of 0.2ppm.
5. the measuring method of gas concentration as claimed in claim 3, is characterized in that: described sensitivity compensation calculation takes the concentration value of increase per minute 0.5 times, until concentration value returns to the step that stabiloity compensation calculates.
6. the measuring method of gas concentration as claimed in claim 1, is characterized in that: when drift occurs sensor initial value reference point, by V 1be compensated for as V 2.
7. the measuring method of gas concentration as claimed in claim 1, it is characterized in that: the time of heating in S1 is 2 hours, the output voltage of potentiometer is 0.6V-0.8V.
8. the measuring method of gas concentration as claimed in claim 1, is characterized in that: in S2, conduction time is 10min.
9. the measuring method of gas concentration as claimed in claim 1, is characterized in that: the power-supply unit of described sensor is direct supply.
CN201410625877.XA 2014-11-06 2014-11-06 Gas concentration measuring method CN104359949A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105938116A (en) * 2016-06-20 2016-09-14 吉林大学 Gas sensor array concentration detection method based on fuzzy division and model integration
WO2020237513A1 (en) * 2019-05-29 2020-12-03 深圳智人环保科技有限公司 Gas detection system that removes influence of ambient temperature or humidity change, and method for same

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CN1177740A (en) * 1996-07-19 1998-04-01 泰里迪尼工业公司 Temp.-compensation electrochemical gas detector and method for tracing gas temp. change
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CN102944583A (en) * 2012-11-30 2013-02-27 重庆大学 Metal-oxide gas sensor array concentration detecting method based on drift compensation
CN103245705A (en) * 2013-05-03 2013-08-14 哈尔滨工业大学深圳研究生院 Detection system for expired gas

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Publication number Priority date Publication date Assignee Title
GB1288539A (en) * 1970-05-22 1972-09-13
CN86106172A (en) * 1985-09-09 1987-06-03 索洛克斯科公司 Gas detector in the air-flow
CN1177740A (en) * 1996-07-19 1998-04-01 泰里迪尼工业公司 Temp.-compensation electrochemical gas detector and method for tracing gas temp. change
CN1213777A (en) * 1997-09-03 1999-04-14 费加罗技研株式会社 Gas testing method and its device
US6019946A (en) * 1997-11-14 2000-02-01 Engelhard Corporation Catalytic structure
CN1715897A (en) * 2005-07-12 2006-01-04 赵飞 Constant temperature combustable gas concentration detector
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CN101482531A (en) * 2009-01-10 2009-07-15 大连理工大学 Baseline shift adaptive compensation detecting method used for combustible gas detector
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105938116A (en) * 2016-06-20 2016-09-14 吉林大学 Gas sensor array concentration detection method based on fuzzy division and model integration
CN105938116B (en) * 2016-06-20 2019-09-10 吉林大学 Gas sensor array concentration detection method based on fuzzy division and model integrated
WO2020237513A1 (en) * 2019-05-29 2020-12-03 深圳智人环保科技有限公司 Gas detection system that removes influence of ambient temperature or humidity change, and method for same

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Application publication date: 20150218

Assignee: Infinitus (China) Co., Ltd.

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Denomination of invention: Gas concentration measuring method

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