CN103454379B - A kind of gas measuring method and device - Google Patents
A kind of gas measuring method and device Download PDFInfo
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Abstract
The invention discloses a kind of gas measuring method and device, comprise the gas concentration signal detecting unit for detecting the gas concentration characterization signal relevant to tested gas concentration, for detecting environmental gas concentration detecting unit and the processing unit of the environmental gas concentration of interference gas, processing unit is connected with gas concentration signal detecting unit and environmental gas concentration detecting unit respectively, zero point correction calculating is carried out according to gas concentration characterization signal when environmental gas concentration during zero school operation and the operation of zero school, the concentration of tested gas is calculated according to gas concentration characterization signal when zero point correction result of calculation and normal measurement.Be the concentration value of interference gas in real environment due to what obtained by environmental gas concentration detecting unit, the zero point correction coefficient calculated accordingly is more accurate, therefore can improve the accuracy of gas measurement device to gas concentration measurement result.
Description
Technical field
The present invention relates to medical gas measurement of concetration and analysis field.
Background technology
At medical field, need in some cases to measure the aeration status of machinery, or the gas concentration in patient respiration process is measured or analyzed.In medical gas measurement of concetration, higher to requirement of real-time, especially for the gas concentration measurement in patient respiration process, measurement result should reflect the situation of patient at that time, and medical worker's situation current to patient according to measurement result is diagnosed and determined treatment or first aid scheme.
Because medical gas measurement of concetration is to the high request of real-time, usually adopt based on NDIR (Non-Dispersive Infrared) spectral analysis (NDIR at present, Non-DispersiveInfrared) gas measurement technique, by tested gas extraction to Measurement channel and reference channel, by the filtering of the optical filter of specific band in Measurement channel, make the illumination of tested gas effect to penetrate tested gas, detect the light intensity signal by tested gas, calculate the concentration of tested gas through the algorithm of regulation.In computation process, for the error that elimination system drifting and aging etc. brings, usual employing concentration known gas is demarcated the conversion coefficient in algorithm, is called school Z-operation, and the object of school Z-operation obtains the conversion coefficient in the conversion equation from electric signal to gas concentration value.Mode common in existing design is the concentration of all types of gas componant in supposition air is theoretical concentration known, adopts air to carry out reference and demarcates zero point.But because the concentration of Atmospheric components is easily affected by environment, therefore each gas composition concentration instability can cause gas measurement device Zero calibration to there is certain error, thus finally causes gas concentration measurement result to there is deviation.In order to solve this problem, general way connects adsorbent at school zero port, for absorbing the interference gas in air, make the concentration of the interference gas extracted from testing environment during the Z-operation of school be 0 as far as possible, and in the Z-operation process of school, the concentration of interference gas is assumed to 0, substitute in the computing formula of gas concentration with this and calculate zero point correction coefficient, thus reduce the error of Zero calibration.But because adsorbent has certain serviceable life, need periodic replacement, and at present cannot detect adsorbent in gas concentration measurement system and whether lost efficacy, when the interference gas that cannot absorb or cannot absorb completely in air after the adsorbent in using lost efficacy and when applying when large discharge, adsorbent can not absorb the interference gas in air completely, and the scheme of thus this environment resistant interference cannot eliminate the impact of environment on gas measurement device Zero calibration in some cases.When gas measurement device Zero calibration exists error, will measurement result be caused further inaccurate.
Summary of the invention
The invention provides a kind of gas measuring method and device.
According to a first aspect of the invention, a kind of gas measurement device is provided, comprises:
Gas concentration signal detecting unit, for extracting gases from testing environment or in monitored air flue, detects the concentration characterization signal of tested gas;
Environmental gas concentration detecting unit, is placed in testing environment, for measuring the concentration of interference gas in testing environment;
Processing unit, be connected to receive the data coming from gas concentration signal detecting unit and environmental gas concentration detecting unit with gas concentration signal detecting unit and environmental gas concentration detecting unit respectively, described processing unit is configured to carry out zero point correction calculating based on the concentration characterization signal of the tested gas of concentration of the interference gas during Z-operation of school, and the concentration characterization signal of tested gas when measuring based on zero point correction result of calculation and Real-time Obtaining normal calculates the concentration of tested gas.
According to a second aspect of the invention, provide a kind of gas measurement device, comprise gas concentration signal detecting unit, processing unit, result output unit and environmental gas concentration detecting unit;
Described gas concentration signal detecting unit is used for extracting gases from environment or in monitored air flue, detects the concentration characterization signal of tested gas;
Described environmental gas concentration detecting unit is placed in testing environment, for measuring the concentration of interference gas in testing environment;
Described processing unit is connected with gas concentration signal detecting unit, environmental gas concentration detecting unit and result output unit respectively, the concentration characterization signal of the tested gas that the concentration of the interference gas that reception environment gas concentration detecting unit exports and gas concentration detecting signal unit detect, and the concentration of the tested gas drawn is outputted to result output unit.
According to a third aspect of the invention we, provide a kind of gas measuring method, comprise school zero step and normal measuring process, its lieutenant colonel zero step comprises:
Gas concentration signal detecting unit, when carrying out school Z-operation, extracts environmental gas from testing environment, detects the concentration characterization signal of tested gas;
The concentration characterization signal of the tested gas that processing unit receiver gases concentration signal detecting unit exports, and the concentration of interference gas testing environment is obtained from environmental gas concentration detecting unit;
The concentration characterization signal of tested gas during processing unit high-ranking officers Z-operation and the concentration of interference gas substitute into gas concentration transformation equation during school zero, gas concentration transformation equation during school zero being solved, obtaining the conversion coefficient for revising the concentration characterization signal of tested gas when normal measurement or offset;
Described normal measuring process comprises:
Gas concentration signal detecting unit is extracting gases from monitored air flue, detects the concentration characterization signal of tested gas;
The concentration characterization signal of the tested gas that processing unit receiver gases concentration signal detecting unit exports in real time, according to the conversion coefficient obtained in the step of school zero or offset, the concentration characterization signal to the tested gas of Real-time Obtaining is revised, and obtains tested gas concentration.
The application is the concentration value of interference gas in real-time environment due to what obtained by environmental gas concentration detecting unit, more close even equal with the concentration value of interference gas in real environment, carry out school zero time, in the environment detect this environmental gas concentration detecting unit, the concentration value of interference gas calculates zero point correction coefficient (i.e. conversion coefficient or offset) as known gas concentration result, the zero point correction coefficient that concentration value calculates accordingly is not subject to or is not substantially subject to the interference of interference gas concentration change in ambient atmosphere, more accurate compared with the method for the hypothesis concentration known value adopted in prior art or adsorbent, therefore the accuracy of gas measurement device to gas concentration measurement result can be improved.
Accompanying drawing explanation
Fig. 1 is the block diagram of a kind of embodiment of the application;
Fig. 2 is the process flow diagram of a kind of embodiment of the application;
Fig. 3 is the block diagram of the another kind of embodiment of the application.
Embodiment
By reference to the accompanying drawings the present invention is described in further detail below by embodiment.
First the term used in the application is made an explanation.
Testing environment, refer to the space that gas measurement device is residing when detecting tested gas, this space may be a smaller enclosure space (such as operating room or emergency tender etc.), also may be a larger clearing, if larger clearing (such as outdoor or larger room), then testing environment is the space in surrounding's certain limit of gas measurement device placement location.In the application, testing environment is also called for short environment.For the application, to the various gases in the influential mainly testing environment of testing result, in testing environment, the concentration of certain gas is called the environmental gas concentration of this gas.In the application, environmental gas concentration detecting unit is namely for measuring the environmental gas concentration of certain gas in testing environment.
Interference gas, refers to that, to the influential gas of testing result in testing environment, for the gas measurement technique based on NDIR (Non-Dispersive Infrared) spectral analysis, interference gas typically refers to the gas in the testing environment identical with tested gaseous species.
Monitored air flue, refer to the container collected and have tested gas, this container can be pipeline or air bag etc., monitored air flue is connected with source of the gas, such as when measuring the aeration status of machinery, monitored air flue is communicated with ventilation air flue usually, or when measuring the gas in patient respiration process, monitored air flue is connected with the corrugated hose of patient.
In medical gas measurement of concetration, the gas concentration in the respiratory of main measurement mechanical ventilation or patient, requirement of real-time is high; And although environmental gas concentration there will be change, its change is usually slower.Therefore based on the feature that medical gas is measured, in the embodiment of the present application, the mode that the environmental gas concentration detecting unit that employing requirement of real-time is lower combines with gas concentration signal detecting unit is to detect the concentration of tested gas.Wherein environmental gas concentration detecting unit measures the concentration of interference gas in testing environment, when adopting the gas in testing environment to carry out zero point correction, the concentration value of interference gas in the testing environment of actual measurement is participated in the calculating of zero point correction as the concentration value in gas concentration transformation equation, the conversion coefficient calculated or offset are used for the calculating of tested gas concentration in normal testing process.
Embodiment one:
As shown in Figure 1, in one embodiment, gas measurement device comprises gas concentration signal detecting unit 10, environmental gas concentration detecting unit 20 and processing unit 30.
Gas concentration signal detecting unit 10 is for from extracting gases in environment or monitored air flue, detect the concentration characterization signal of tested gas, the concentration characterization signal of tested gas can be such as the electric signal relevant to tested gas concentration, or those skilled in the art think that adoptable other characterizes the signal of tested gas concentration.In the present embodiment, gas concentration signal detecting unit is NDIR (Non-Dispersive Infrared) spectral analysis gas concentration signal detecting unit, and in other embodiments, gas concentration signal detecting unit also can adopt other principles to detect gas concentration.When needs carry out school Z-operation, gas concentration signal detecting unit 10 extracting gases from testing environment carries out tested gas concentration detection, when carrying out normal gas concentration measurement, gas concentration signal detecting unit 10 carries out tested gas concentration detection from extracting gases in monitored air flue.In an instantiation, gas concentration signal detecting unit 10 by air pump and/or gas circuit from extracting gases in testing environment or monitored air flue, monitored air flue also can according to equipment need be designed to different shapes, and/or there is different spatial accommodations.
Environmental gas concentration detecting unit 20 is for measuring the concentration of interference gas in testing environment, it is placed in testing environment, environmental gas concentration detecting unit 20 can be arranged on gas measurement device and can the position of contact environment gas, such as can be arranged on certain position of the hull outside of gas measurement device, also can be arranged on the enclosure interior of gas measurement device, but need passing hole or passage to make environmental gas concentration detecting unit 20 touch environmental gas; Environmental gas concentration detecting unit 20 also can be placed on separately the outside of gas measurement device, and testing result is sent to processing unit 30 by wired or wireless mode.Environmental gas concentration detecting unit 20 can adopt solid electrolyte battery principle, namely produces corresponding electric signal according to the concentration of different environmental gas.
Processing unit 30 is connected with gas concentration signal detecting unit 10 and environmental gas concentration detecting unit 20 respectively, to carry out communication with gas concentration detecting signal unit 10 and environmental gas concentration detecting unit 20, such as gas concentration signal detecting unit 10 is controlled, receive the data etc. coming from gas concentration signal detecting unit 10 and environmental gas concentration detecting unit 20.Processing unit 30 can be wired electrical connection with the connected mode of gas concentration signal detecting unit 10 and environmental gas concentration detecting unit 20, also can be wireless connections, gas concentration signal detecting unit 10 and environmental gas concentration detecting unit 20 send the data to processing unit 30 respectively by wireless communication mode.
Environmental gas concentration when processing unit 30 obtains school Z-operation from environmental gas concentration detecting unit 20, and the gas concentration characterization signal during school Z-operation of receiver gases concentration signal detecting unit 20 output and gas concentration characterization signal when normally measuring, processing unit 30 carries out zero point correction calculating according to the gas concentration characterization signal gathered when the concentration of interference gas in the testing environment during Z-operation of school and school Z-operation, calculates the concentration of tested gas according to the gas concentration characterization signal of Real-time Obtaining when zero point correction result of calculation and normal measurement.
In a kind of instantiation, the condition judgment that processing unit 30 can be used for according to presetting needs carry out school zero or normally measure, when processing unit 30 detect meet school zero condition time, then perform school zero program, school Z-operation control signal is sent to gas concentration signal detecting unit 10, control gas concentration signal detecting unit 10 and perform school Z-operation, from testing environment, extracting gases carries out tested gas concentration detection.School zero condition can be a timing condition, after the time arrives, is and meets school zero condition.School zero condition can be the concentration of the tested gas detected and a setting threshold range are compared, when exceeding setting threshold range, think and meet school zero condition, enter school zero program, this situation illustrates that the concentration of the tested gas of actual measurement may exist comparatively big error, needs to recalculate conversion coefficient or offset.When processing unit 30 detects satisfied normal measuring condition, then perform normal process of measurement, normal measuring control signal is sent to gas concentration signal detecting unit 10, control gas concentration signal detecting unit 10 and perform normal measurement, in monitored air flue, extracting gases carries out tested gas concentration detection.School Z-operation terminates can as normal measuring condition, and the normal measuring command of operator's input also can as normal measuring condition.
In an instantiation, environmental gas concentration detecting unit can be the gas sensor corresponding with tested gas, and such as, tested gas is carbon dioxide, then corresponding gas sensor is carbon dioxide gas sensor; If tested gas is ether, then corresponding gas sensor is ether gas sensor.Gas sensor can adopt the mode of chemistry to carry out the concentration of certain gas in testing environment, and testing process is slower.Also other gas concentration detector device can be adopted to carry out the concentration of the tested gas in measurement environment according to content those skilled in the art disclosed in the present application.The concentration of the tested gas that environmental gas concentration detecting unit 20 can constantly provide it to detect, in a kind of instantiation, processing unit 30 can gather the concentration value of environmental gas concentration detecting unit 20 output by its I/O mouth at interval of certain hour, concentration value and the time of tested gas is recorded when gathering, when school zero, its time concentration value that is consistent with the school zero-time or immediate tested gas is only adopted to participate in calculation of transform coefficients.In another kind of instantiation, processing unit 30 also can work as the concentration value just reading tested gas when carrying out school Z-operation to environmental gas concentration detecting unit 20.
In the above-described embodiments, what gas concentration signal detecting unit 10 detected is the concentration characterization signal relevant with tested gas concentration, and such as electric signal, in subsequent calculations, need the concentration according to certain transformation relation formula, concentration characterization signal being transformed into tested gas.For how, concentration characterization signal is transformed into the concentration of tested gas, those skilled in the art can according to different measurement mechanisms and measuring method setting transformation relation formula.Transformation relation formula can be a transformation matrix, also can be one simply plus-minus revise relational expression, also transformation matrix with simply add and subtract the combination revising relational expression, claim this transformation relation formula to be gas concentration transformation equation in the application.Under normal circumstances, have three kinds of parameters in gas concentration transformation equation, the first is the concentration results of tested gas, and the second is gas concentration characterization signal sampled value, and gas concentration characterization signal sampled value can be a sampled value, also can be one group of sampled value.The third is conversion coefficient or offset, and this conversion coefficient or offset are used for revising the concentration characterization signal of tested gas, to draw tested gas concentration.In three kinds of parameters known two kinds, namely solve by the other side's journey, obtain the third.Only be described by way of example herein.
Suppose that gas concentration transformation equation is:
Y
0=f(A
n，X
0)-----------------------（1）
Wherein: Y
0for the concentration results of tested gas, be the last tested gas concentration value exported, X
0for the concentration characterization signal sampled value of a group or a tested gas, A
nfor conversion coefficient or the offset of a group or a gasmetry, f () is the calculation relational expression between tested gas concentration result and tested gas concentration characterization signal sampled value.
In practical operation, the transformation relation formula used in the Z-operation process of school can be identical with the transformation relation formula used in proper testing process, also can be different.Usually, transformation relation formula is the transformation relation formula used in the Z-operation process of school, is also the transformation relation formula used in proper testing process.
When adopting equation (1) to calculate the concentration of tested gas, carrying out in the Z-operation process of school, first supposing that the concentration of current tested gas is concentration known, using the concentration results Y of concentration known as the tested gas in equation (1)
0, the concentration characterization signal of the current tested gas collected by gas concentration signal detecting unit 10 is as the concentration characterization signal sampled value X of tested gas in equation (1)
0, concentration value Y
0with sampled signal X
0equation (1) must be met, therefore can obtain one group of conversion coefficient or offset A according to equation (1)
0, also referred to as zero point correction coefficient A
0.By A in follow-up calculating
0bring in gas concentration transformation equation as conversion coefficient or offset A
n, be used for revising the concentration characterization signal of the tested gas measured in real time, obtain revised tested gas concentration value.Because system drifting has impact to gasmetry result, so zero point correction coefficient A
0whether accurately directly affect the accuracy of gas concentration measurement result.
In the embodiment of the present application, when school Z-operation, gas concentration signal detecting unit 10 extracting gases from testing environment, tested gas and interference gas, through detecting, obtaining the concentration characterization signal of interference gas, and exporting to processing unit 30, processing unit 30 obtains the sampled value of the concentration characterization signal of the tested gas of interference gas through sampling, and as the concentration characterization signal sampled value X in equation (1)
0.On the other hand, interference gas concentration when processing unit 30 obtains school Z-operation from environmental gas concentration detecting unit 20 testing environment, using this interference gas concentration as the concentration results Y in equation (1)
0, zero point correction coefficient A can be calculated according to equation (1)
0.
When normally measuring, gas concentration signal detecting unit 10 is from extracting gases in monitored air flue, detect the gas concentration characterization signal of tested gas, and export to processing unit 30, processing unit 30 obtains the sampled value X of the concentration characterization signal of tested gas through sampling
0'.By sampled value X
0' and school Z-operation time the zero point correction coefficient A that draws
0substitute into equation (1), the concentration value of real-time tested gas can be calculated.
And adopt in the prior art of adsorbent, when school Z-operation, be that the concentration value of interference gas is assumed to 0, using the interference gas concentration value of hypothesis as the Y in equation (1)
0, i.e. Y
0=0.But when adsorbent lost efficacy or can not adsorb the interference gas in testing environment completely, the concentration that gas concentration signal detecting unit 10 performs the interference gas that school Z-operation extracts from testing environment is not 0, the characterization signal that the concentration characterization signal of the interference gas namely detected not is interference gas concentration when being 0, therefore according to the zero point correction coefficient A that equation (1) calculates
0error will be there is.
Owing in the embodiment of the present application being the Y actual concentration value of interference gas in actual for environmental gas concentration detecting unit 20 testing environment recorded substituted in equation (1)
0, and the concentration that simultaneously gas concentration signal detecting unit 10 performs the interference gas that school Z-operation extracts from testing environment is also this concentration or closely this concentration, therefore by zero point correction coefficient A that equation (1) calculates
0more accurate.
Due to zero point correction coefficient A in the embodiment of the present application
0calculated by the actual concentration value of interference gas in the actual testing environment recorded of environmental gas concentration detecting unit 20, there is not the situation being assumed to be a given value (such as adopt in the prior art of adsorbent and the concentration value of interference gas is assumed to 0), so avoid default and environment actual value is not inconsistent the error caused.Therefore, adopt the embodiment in the application, how to change regardless of interference gas in environment, all can calculate zero point correction coefficient more accurately, thus improve the accuracy of measurement result.
For reducing system drifting and the aging error brought, at interval of a period of time, gas measurement device will carry out once school Z-operation as required, demarcate conversion coefficient.The school zero-time can be arranged according to the specific requirement of the needs measured and gas measurement device.Therefore the measuring process of gas concentration measurement comprises school zero step and normal measuring process, is called one-period, adopts the zero point correction coefficient obtained during the school Z-operation in this cycle as conversion coefficient in normal measuring process from this time school zero to school zero next time.
In the step of school zero, gas concentration signal detecting unit extracts environmental gas from testing environment, detects the concentration characterization signal of tested gas; The concentration characterization signal of the tested gas that processing unit receiver gases concentration signal detecting unit exports, and the concentration of interference gas testing environment is obtained from environmental gas concentration detecting unit; Then processing unit carries out zero point correction calculating according to the concentration characterization signal of the tested gas during Z-operation of school and the concentration of interference gas, obtains the conversion coefficient in tested gas concentration transformation equation or offset.
In normal measuring process, gas concentration signal detecting unit is extracting gases from monitored air flue, detects the concentration characterization signal of tested gas; The concentration characterization signal of the tested gas that processing unit receiver gases concentration signal detecting unit exports in real time, according to the conversion coefficient obtained in the concentration characterization signal of real-time tested gas and school zero step or offset, calculate tested gas concentration through gas concentration transformation equation.
Be illustrated in figure 2 in a kind of instantiation and adopt above-mentioned gas measurement mechanism to carry out the process flow diagram of gas concentration measurement, each cycle comprises following measuring process:
Step S11, starts school zero step.After processing unit monitors and meets school zero condition, such as monitor after the school zero-time arrives, then control gas concentration signal detecting unit and perform school Z-operation, school zero step comprises step S12 to S14.
Step S12, gas concentration signal detecting unit processing unit control under from environment extracting air, detect the concentration characterization signal of tested gas.
Step S13, the gas concentration characterization signal that processing unit receiver gases concentration signal detecting unit exports, and the concentration obtaining interference gas from environmental gas concentration detecting unit.
Step S14, processing unit carries out zero point correction calculating according to the gas concentration characterization signal when concentration of interference gas in the testing environment during Z-operation of school and school Z-operation, obtains zero point correction coefficient A according to equation (1)
0, and by zero point correction coefficient A
0as the conversion coefficient in gas concentration calculating transformation equation tested during normal measurement or offset.
Step S15, start normal measuring process, (the normal measuring command of such as user's input when processing unit receives normal measuring command, or according to measuring the clocked flip order of the normal measurement that interval sets), or when processing unit judges that school Z-operation terminates and do not receive the finish command, then perform and normally measure operation.Normal measurement comprises step S16 to S17.
Step S16, processing unit controls gas concentration signal detecting unit extracting gases from monitored air flue, and gas concentration signal detecting unit detects the concentration characterization signal of tested gas.
Step S17, the concentration characterization signal of the tested gas that processing unit receiver gases concentration signal detecting unit exports in real time, according to the conversion coefficient obtained in the concentration characterization signal of real-time tested gas and school zero step or offset, calculate tested gas concentration through equation (1).
Step S18, processing unit judges whether to arrive the school zero-time, if so, then turns to and performs step S11, if also do not arrive the school zero-time, then turns to and performs step S15.After carrying out once new school Z-operation, during normal measurement, adopt the conversion coefficient newly calculated or offset.
Below for tested gas be carbon dioxide, gas concentration signal detecting unit is described in detail for NDIR (Non-Dispersive Infrared) spectral analysis gas concentration signal detecting unit.
Gas concentration signal detecting unit comprises reference channel, Measurement channel, light detecting device, zero mouthful, school and gas circuit, the optical filter corresponding with tested atmospheric carbon dioxide is provided with in Measurement channel, only by the light of specific band, gas in the light irradiation tunnel of this specific band, and act on (such as transmission through carbon dioxide, reflection or refraction) afterwards light intensity change, light detecting device be arranged on through carbon dioxide act on after light path on, detect in reference channel in the light intensity and Measurement channel exported through carbon dioxide act on after light intensity, in an instantiation, the light intensity of detection is converted to corresponding electric signal by light detecting device, and be transferred to processing unit.
Environmental gas concentration detecting unit is carbon dioxide gas sensor, specifically can use existing carbon dioxide gas sensor, certainly, it will be appreciated by those skilled in the art that carbon dioxide gas sensor also can adopt emerging carbon dioxide gas sensor in the future.Environmental gas concentration detecting unit can be arranged on any position touching environmental gas of gas measurement device, in an instantiation, environmental gas concentration detecting unit is arranged near zero mouthful, school, and the density of carbon dioxide gas in the environment making it detect is closer to the density of carbon dioxide gas in the environmental gas extracted during the Z-operation of school.
Processing unit can be an independently process chip, also can integrate with the primary processor of equipment.In an instantiation, processing unit is electrically connected with the light detecting device of gas concentration signal detecting unit and carbon dioxide gas sensor respectively, gathers the electric signal relevant to tested gas concentration that light detecting device exports and the electric signal of being correlated with density of carbon dioxide gas in environment that carbon dioxide gas sensor exports.
When school Z-operation, gas concentration signal detecting unit is zero mouthful of extracting gases from testing environment through school, and the gas of extraction is passed to reference channel and Measurement channel through gas circuit.In Measurement channel, penetrated the gas of extraction by the illumination setting wave band, detect the light intensity of light after gas effect of setting wave band, light intensity is converted to electric signal and exports to processing unit.The electric signal that processing unit sampling reference channel and Measurement channel export, obtains the sampled value of the concentration characterization signal of carbon dioxide in environment.On the other hand, the concentration of processing unit interference gas from testing environment during environmental gas concentration detecting unit acquisition school Z-operation, the sampled value of the concentration characterization signal of the concentration of this interference gas and carbon dioxide is substituted into transformation equation, zero point correction coefficient can be calculated.
When normally measuring, gas concentration signal detecting unit 10 is through gas circuit from extracting gases in monitored air flue, and gas is passed to reference channel and Measurement channel through gas circuit.In Measurement channel, penetrated the gas of extraction by the illumination setting wave band, detect the light intensity of light after gas effect of setting wave band, light intensity is converted to electric signal and exports to processing unit.The electric signal that processing unit sampling reference channel and Measurement channel export, obtains the sampled value of carbon dioxide (i.e. tested gas).The zero point correction coefficient drawn when sampled value and school Z-operation is substituted into transformation equation, the concentration value of carbon dioxide can be calculated.
Embodiment two:
With the duty of embodiment one unlike, processing unit also monitoring environment gas concentration detecting unit, and environmentally the duty of gas concentration detecting unit judges that whether environmental gas concentration detecting unit is abnormal, if abnormal, and output alarm signal.This alerting signal is exportable gives alarm unit, controls alarm unit and reports to the police, also exportablely to show to display unit, or exports to storage unit and carry out record.
In an embodiment as illustrated in figure 3, gas measurement device comprises gas concentration signal detecting unit 10, environmental gas concentration detecting unit 20, processing unit 30 and alarm unit 40, processing unit 30 respectively with gas concentration detecting signal unit 10, environmental gas concentration detecting unit 20, alarm unit 40 connects, gas concentration signal detecting unit 10 is for from extracting gases in testing environment or monitored air flue, detect the concentration characterization signal of tested gas, environmental gas concentration detecting unit 20 is for the concentration of interference gas in testing environment, the duty of processing unit 30 monitoring environment gas concentration detecting unit 20, and environmentally the duty of gas concentration detecting unit judges that whether environmental gas concentration detecting unit is abnormal, if abnormal, output alarm signal controls alarm unit 40 and reports to the police.
In an instantiation, the environmental gas concentration that processing unit 30 timing acquisition environmental gas concentration detecting unit 20 exports, judge whether environmental gas concentration is positioned at predetermined concentration range, if environmental gas concentration exceeds predetermined concentration range, then to alarm unit 40 output alarm signal.
Alarm unit 40 can be sound or light alarm unit or both combinations.
Embodiment three:
In a particular application, gas measurement device comprises gas concentration signal detecting unit, environmental gas concentration detecting unit, processing unit and result output unit, processing unit is connected with gas concentration signal detecting unit, environmental gas concentration detecting unit and result output unit respectively, the concentration characterization signal of the tested gas that the concentration of the interference gas that processing unit reception environment gas concentration detecting unit exports and gas concentration detecting signal unit detect, and the concentration of the tested gas drawn is outputted to result output unit.Result output unit can be display device, and the display of the concentration of tested gas checked for user on a display screen, as required, result output unit also can printing device or memory device.
The numerical procedure of tested gas concentration is: when processing unit control gas concentration signal detecting unit carries out school Z-operation, using the concentration of interference gas that obtains from environmental gas concentration detecting unit as the gas concentration in gas conversion equation, and the gas concentration characterization signal during school zero exported in conjunction with gas concentration signal detecting unit carries out zero point correction calculating.In normal measurement process, processing unit is according to zero point correction result of calculation and the concentration calculating tested gas from the gas concentration characterization signal of gas concentration signal detecting unit Real-time Obtaining.
The gas measurement device of above-described embodiment can be used for the patient respiration gas detect of Medical Devices, such as, for patient monitor, Anesthesia machine or lung ventilator etc.
Above content is in conjunction with concrete embodiment further description made for the present invention, can not assert that specific embodiment of the invention is confined to these explanations.For general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, some simple deduction or replace can also be made, all should be considered as belonging to protection scope of the present invention.
Claims (11)
1. a gas measurement device, is characterized in that comprising:
Gas concentration signal detecting unit, for when needs carry out school Z-operation, from testing environment, extracting gases detects the concentration characterization signal of tested gas, and when carrying out normal gas concentration measurement, in monitored air flue, extracting gases detects the concentration characterization signal of tested gas;
Environmental gas concentration detecting unit, is placed in testing environment, for measuring the concentration of interference gas in testing environment;
Processing unit, be connected to receive the data coming from gas concentration signal detecting unit and environmental gas concentration detecting unit with gas concentration signal detecting unit and environmental gas concentration detecting unit respectively, described processing unit carries out zero point correction calculating based on the concentration of the interference gas during Z-operation of school and the concentration characterization signal of tested gas, and the concentration characterization signal of tested gas when measuring based on zero point correction result of calculation and Real-time Obtaining normal calculates the concentration of tested gas; Described processing unit is when performing zero-calibration procedure, transformation relation formula when the concentration of the interference gas obtained from environmental gas concentration detecting unit is substituted into school zero as known gas concentration result, transformation relation formula when the gas concentration characterization signal obtained from gas concentration signal detecting unit is substituted into school zero as known gas concentration characterization signal sampled value, transformation relation formula during school zero is solved, obtains the conversion coefficient in transformation relation formula or offset; Described processing unit is when performing normal process of measurement, the conversion coefficient obtained during zero point correction or offset are substituted into the normal transformation relation formula measured, and the gas concentration characterization signal from gas concentration signal detecting unit Real-time Obtaining is substituted into the normal transformation relation formula measured, calculate the concentration of tested gas.
2. a gas measurement device, comprises gas concentration signal detecting unit, processing unit and result output unit, characterized by further comprising environmental gas concentration detecting unit;
Described gas concentration signal detecting unit is used for when needs carry out school Z-operation, extracting gases from environment, detects the concentration characterization signal of tested gas, when carrying out normal gas concentration measurement, extracting gases in monitored air flue, detects the concentration characterization signal of tested gas;
Described environmental gas concentration detecting unit is placed in testing environment, for measuring the concentration of interference gas in testing environment;
Described processing unit is connected with gas concentration signal detecting unit, environmental gas concentration detecting unit and result output unit respectively, the concentration characterization signal of the tested gas that the concentration of the interference gas that reception environment gas concentration detecting unit exports and gas concentration detecting signal unit detect, and the concentration of the tested gas drawn is outputted to result output unit; Described processing unit is when performing zero-calibration procedure, transformation relation formula when the concentration of the interference gas obtained from environmental gas concentration detecting unit is substituted into school zero as known gas concentration result, transformation relation formula when the gas concentration characterization signal obtained from gas concentration signal detecting unit is substituted into school zero as known gas concentration characterization signal sampled value, transformation relation formula during school zero is solved, obtains the conversion coefficient in transformation relation formula or offset; Described processing unit is when performing normal process of measurement, the conversion coefficient obtained during zero point correction or offset are substituted into the normal transformation relation formula measured, and the gas concentration characterization signal from gas concentration signal detecting unit Real-time Obtaining is substituted into the normal transformation relation formula measured, calculate the concentration of tested gas.
3. gas measurement device as claimed in claim 1 or 2, it is characterized in that, described transformation relation formula is gas concentration transformation equation.
4. gas measurement device as claimed in claim 1 or 2, it is characterized in that, described environmental gas concentration detecting unit comprises the gas sensor corresponding with tested gas.
5. gas measurement device as claimed in claim 1 or 2, it is characterized in that, described gas concentration signal detecting unit comprises zero mouthful, the school for extracting environmental gas, and described environmental gas concentration detecting unit and zero mouthful, school are arranged in same environment.
6. gas measurement device as claimed in claim 1 or 2, it is characterized in that, described gas concentration signal detecting unit is NDIR (Non-Dispersive Infrared) spectral analysis gas concentration signal detecting unit.
7. gas measurement device as claimed in claim 1 or 2, it is characterized in that, described processing unit determines whether output alarm signal based on the duty of the environmental gas concentration detecting unit detected.
8. gas measurement device as claimed in claim 7, is characterized in that, described processing unit judges whether the concentration of the interference gas obtained is positioned at predetermined concentration range, if the concentration of interference gas exceeds predetermined concentration range, then and output alarm signal.
9. a gas measuring method, comprises school zero step and normal measuring process, it is characterized in that:
Described school zero step comprises:
Gas concentration signal detecting unit, when carrying out school Z-operation, extracts environmental gas from testing environment, detects the concentration characterization signal of tested gas;
The concentration characterization signal of the tested gas that processing unit receiver gases concentration signal detecting unit exports, and the concentration of interference gas testing environment is obtained from environmental gas concentration detecting unit;
Processing unit carries out zero point correction calculating according to the concentration characterization signal of the tested gas during Z-operation of school and the concentration of interference gas, calculation of transform coefficients or offset, specifically comprise: the transformation relation formula when concentration of the interference gas obtained from environmental gas concentration detecting unit is substituted into school zero as known gas concentration result by described processing unit, transformation relation formula when the gas concentration characterization signal obtained from gas concentration signal detecting unit is substituted into school zero as known gas concentration characterization signal sampled value, transformation relation formula during school zero is solved, obtain the conversion coefficient in transformation relation formula or offset,
Described normal measuring process comprises:
Gas concentration signal detecting unit is extracting gases from monitored air flue, detects the concentration characterization signal of tested gas;
The concentration characterization signal of the tested gas that processing unit receiver gases concentration signal detecting unit exports in real time, the conversion coefficient obtained during zero point correction or offset are substituted into the normal transformation relation formula measured, and the gas concentration characterization signal from gas concentration signal detecting unit Real-time Obtaining is substituted into the normal transformation relation formula measured, calculate the concentration of tested gas.
10. method as claimed in claim 9, it is characterized in that, described environmental gas concentration detecting unit comprises the gas sensor corresponding with tested gas, and described gas concentration signal detecting unit is NDIR (Non-Dispersive Infrared) spectral analysis gas concentration signal detecting unit.
11. methods as described in claim 9 or 10, it is characterized in that, described processing unit also performs following steps after getting the environmental gas concentration of environmental gas concentration detecting unit output: judge whether environmental gas concentration is positioned at predetermined concentration range, if environmental gas concentration exceeds predetermined concentration range, then output alarm signal.
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| US10643008B2 (en) | 2014-11-11 | 2020-05-05 | Spectrasensors, Inc. | Target analyte detection and quantification in sample gases with complex background compositions |
| CN106053722A (en) * | 2016-05-20 | 2016-10-26 | 东莞市普锐美泰环保科技有限公司 | VOCs detection method and apparatus |
| CN107957405A (en) * | 2018-01-11 | 2018-04-24 | 太原海纳辰科仪器仪表有限公司 | A kind of portable infrared flue gas analyzer |
| CN110018274A (en) * | 2019-02-04 | 2019-07-16 | 北京东方智明科技有限公司 | A kind of gas detection sensor scaling method not depending on calibrating gas |
| CN112577912A (en) * | 2019-09-27 | 2021-03-30 | 深圳市理邦精密仪器股份有限公司 | Zero calibration abnormity detection method and breathing gas monitoring equipment |
| CN113850093B (en) * | 2021-09-08 | 2024-05-14 | 中国原子能科学研究院 | Positioning method, detection device and storage medium |
| CN117310144A (en) * | 2023-11-28 | 2023-12-29 | 深圳市瑞利医疗科技有限责任公司 | Zero drift compensation method and device, expiration measurement equipment and storage medium |
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