CN108663341A - A kind of medical respiration carbon dioxide concentration measurement system - Google Patents
A kind of medical respiration carbon dioxide concentration measurement system Download PDFInfo
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- CN108663341A CN108663341A CN201810711887.3A CN201810711887A CN108663341A CN 108663341 A CN108663341 A CN 108663341A CN 201810711887 A CN201810711887 A CN 201810711887A CN 108663341 A CN108663341 A CN 108663341A
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 97
- 238000005259 measurement Methods 0.000 title claims abstract description 82
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 51
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 47
- 230000029058 respiratory gaseous exchange Effects 0.000 title claims abstract description 17
- 238000012360 testing method Methods 0.000 claims abstract description 24
- 238000005538 encapsulation Methods 0.000 claims abstract description 6
- 230000003287 optical effect Effects 0.000 claims description 15
- 230000003321 amplification Effects 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 5
- 229910002090 carbon oxide Inorganic materials 0.000 claims description 3
- 230000000747 cardiac effect Effects 0.000 claims description 2
- 238000012937 correction Methods 0.000 abstract description 4
- 238000013508 migration Methods 0.000 abstract description 2
- 230000005012 migration Effects 0.000 abstract description 2
- 229960004424 carbon dioxide Drugs 0.000 description 44
- 238000000034 method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 239000011521 glass Substances 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 239000012780 transparent material Substances 0.000 description 2
- VLCQZHSMCYCDJL-UHFFFAOYSA-N tribenuron methyl Chemical compound COC(=O)C1=CC=CC=C1S(=O)(=O)NC(=O)N(C)C1=NC(C)=NC(OC)=N1 VLCQZHSMCYCDJL-UHFFFAOYSA-N 0.000 description 2
- 206010002091 Anaesthesia Diseases 0.000 description 1
- 238000004566 IR spectroscopy Methods 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 230000037005 anaesthesia Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002329 infrared spectrum Methods 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 210000004072 lung Anatomy 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000002560 therapeutic procedure Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analysing Biological Materials (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
A kind of medical respiration carbon dioxide concentration measurement system, including light source, gas chamber, the gas chamber are used for through under test gas, and the light source further includes Measuring plate, detector and processor for being radiated on the gas chamber to form light path；The Measuring plate is equipped with multiple measurement windows, the calibrating gas of one of measurement window encapsulation known concentration, the Measuring plate is arranged in the light path, monochromatic light road is divided into multiple Measurement channels, the detector has multiple, and each detector coordinates with Measurement channel respectively, for obtaining the signal on Measurement channel, and send a signal to the processor and handled, the processor is additionally operable to control light source.When the application carries out zero correction, it can be carried out according to the calibrating gas of the known concentration, without introducing extraneous air zero correction is carried out as zero reference point, avoid influence of the zero migration to measurement caused by external zero reference gas, it realizes without school Z-operation function, improves the stability of measurement.
Description
Technical field
This application involves medical field more particularly to a kind of medical respiration carbon dioxide concentration measurement systems.
Background technology
Medical respiration carbon dioxide monitoring be modern clinic operation in, one of the key parameter in Intensive Care Therapy, Ke Yiying
For multi-parameter breathing gas patient monitor, lung ventilator, in Anesthesia machine and the special patient monitor of breathing gas, the wherein medical respiration heart two
Carbonoxide monitoring technology is key core technology therein, applies the medical respiration gas concentration lwevel in above system at present
Measuring technique is typically the technology using Infrared spectra adsorption, has the realization method of by-pass flow and mainstream, is required for carrying out input zero
The school Z-operation of reference could realize accurate measurement.
Current common medical carbon dioxide gas measurement system, as shown in Figure 1, including light source 11, gas chamber 12 and detector
13, it waits and surveys gas from the input of the arrival end of gas chamber 12 and exported from the output end of gas chamber 12, light source 11 is for being radiated at gas chamber 12
On to form light path and reference path to be measured, detector 13 has two-way, for obtaining the signal in light path, and sends a signal to
Processor (not shown) is handled, and since twin-channel otherness can also increase measurement error, needs the school Z-operation of timing,
Using and it is inconvenient.
Invention content
The application technical problems to be solved are in view of the deficiencies of the prior art, it is dense to provide a kind of medical respiration carbon dioxide
Spend measuring system.
The application technical problems to be solved are solved by the following technical programs：
A kind of medical respiration carbon dioxide concentration measurement system, including light source, gas chamber, the gas chamber are used to pass through gas to be measured
Body, the light source further include Measuring plate, detector and processor for being radiated on the gas chamber to form light path；The survey
It measures disk and is equipped with multiple measurement windows, the Measuring plate is arranged in the light path, and monochromatic light road is divided into multiple Measurement channels, described
Detector has multiple, and each detector coordinates with Measurement channel respectively, for obtaining the signal on Measurement channel, and will letter
Number being sent to the processor is handled, and the processor is additionally operable to control light source.
The measurement window includes three, and the monochromatic light road is divided under test gas light path, gas to be measured by three measurement windows
Body+carbon dioxide calibrating gas light path and reference path.
The measurement window includes the through-hole and transparency cover being arranged in the Measuring plate, and the transparency cover is arranged described
Through-hole both ends.
The measurement window includes the main measurement window being arranged in the under test gas light path, is arranged in the reference light
The reference measure window of road and the subsidiary window being arranged in the under test gas+standard carbon dioxide gas light path,
The calibrating gas of encapsulation known concentration in the subsidiary window.
Air is encapsulated in the main measurement window and the reference measure window, and standard is encapsulated in the subsidiary window
Carbon dioxide gas.
The both ends of the main measurement window be equipped with centre wavelength be 4.26 microns of optical filters, the two of the subsidiary window
It is 4.26 microns of optical filters that end, which is equipped with centre wavelength, and it is 3.7 microns of filters that the both ends of the reference measure window, which are equipped with centre wavelength,
Mating plate.
The Measuring plate is disk.
The measuring chamber is cylindrical.
Further include amplification and filter circuit, analog to digital conversion circuit, the signal that the detector obtains is put described in process successively
Greatly be sent to the processor after filter circuit and analog-digital conversion circuit as described.
As a result of above technical scheme, the advantageous effect that the application has is made to be：
In the specific implementation mode of the application, since multiple measurement windows, and one wherein being arranged in Measuring plate
Single channel light path is divided into three measurements by three measurement windows and led to by the calibrating gas that known concentration is sealed in measurement window
Road can carry out when the application carries out zero correction according to the calibrating gas of the known concentration, make without introducing extraneous air
Zero correction is carried out for zero reference point, influence of the zero migration to measurement caused by external zero reference gas is avoided, realizes nothing
School Z-operation function, improves the stability of measurement.
Description of the drawings
Fig. 1 is medical carbon dioxide gas measurement system structural schematic diagram；
Fig. 2 is the structural schematic diagram of the system of the application in one embodiment；
Fig. 3 is the structural schematic diagram of the system of the application in another embodiment；
Fig. 4 is the flow chart of embodiments herein two.
Specific implementation mode
The application is described in further detail below by specific implementation mode combination attached drawing.
Embodiment two：
The application is the survey of medical respiration carbon dioxide for providing a kind of medical respiration carbon dioxide concentration measurement system
Amount provides hardware supported.Corresponding software is installed in the system of the application, you can the carbon dioxide generated to breathing measures.
As shown in Figure 2 and Figure 3, a kind of medical respiration carbon dioxide concentration measurement system, including light source 10, gas chamber 20, measurement
Disk 30, detector 40, processor 50 and light source driving circuit 60, gas chamber 20 are used for through under test gas, and light source 10 is for irradiating
To form light path on gas chamber 20, Measuring plate 30 is equipped with multiple measurement windows, and Measuring plate 30 is arranged in light path, by monochromatic light road point
For multiple Measurement channels, detector 40 has multiple, and each detector 40 coordinates with a Measurement channel respectively, is measured for obtaining
Signal on channel, and send a signal to processor 50 and handled, processor 50 can be additionally used in by controlling light source 10,
In a kind of embodiment, processor 50 can also pass through light source driving circuit 60 and control light source 10.Measuring plate 30 can be a variety of shapes
Shape, in the present embodiment, Measuring plate 30 are disc.
In one embodiment, measurement window includes three, and monochromatic light road is divided under test gas light by three measurement windows
Road, under test gas+carbon dioxide calibrating gas light path and reference path.Measurement window may include being arranged in Measuring plate 30
Through-hole and transparency cover, transparency cover are arranged at through-hole both ends.Measuring chamber may be various shapes, such as cylindrical, cylinder,
In present embodiment, measuring chamber is cylindrical, and measurement window is the hollow cylinder being arranged in Measuring plate 30 and divides
At both ends, setting transparency cover does not form, and to ensure the symmetry of light path, transparent cameo glass can be selected in transparency cover or other are transparent
Material.
Further, measurement window further includes main measurement window 31, reference measure window 32 and subsidiary window 33.It is main
Measurement window 31 is arranged under test gas light path, and reference measure window 32 is arranged in reference path, subsidiary window 33
It is arranged under test gas+standard carbon dioxide gas light path, the calibrating gas of encapsulation known concentration in subsidiary window 33.
In one embodiment, air is encapsulated in main measurement window 31 and reference measure window 32 respectively, in subsidiary window 33
Encapsulation standard carbon dioxide gas.
In one embodiment, it is 4.26 microns of optical filters, auxiliary that the both ends of main measurement window 31, which are equipped with centre wavelength,
It is 4.26 microns of optical filters that the both ends of measurement window 32, which are equipped with centre wavelength, and the both ends of reference measure window are equipped with centre wavelength
3.7 microns of optical filters.
Further, the system of the application can also include amplification and filter circuit 70, analog to digital conversion circuit 80, detector
The signal of acquisition is sent to processor by amplifying with after filter circuit and analog to digital conversion circuit successively.
Embodiment two：
Fig. 4 is the flow chart of medical respiration carbon dioxide concentration measurement method provided by Embodiment 2 of the present invention, this implementation
The executive agent of example can be a functional unit in computer equipment or computer equipment, include the following steps：
Step 102：One Measuring plate is set on optical path, three measurement windows are set in Measuring plate, and wherein one
The carbon dioxide calibrating gas of known concentration is sealed in a measurement window.
Three measurement windows are set in Measuring plate, it specifically can be by the way that three through-holes be arranged in Measuring plate, and in through-hole
Transparency cover is arranged to realize in both ends.In one embodiment, it is contemplated that the consistency of light path, measurement window are that setting is being surveyed
It measures the hollow cylinder on disk and setting transparency cover forms at both ends respectively, to ensure the symmetry of light path, and ensure three tunnels
Light path it is consistent, transparent cameo glass or other transparent materials can be selected in transparency cover.
Step 104：Single channel light path is divided into three Measurement channels by three measurement windows, Measurement channel includes to be measured
Gas light path, under test gas+carbon dioxide calibrating gas light path and reference path.
In one embodiment, under test gas light path by be equipped with centre wavelength be 4.26 micro- the both ends of measurement window
Rice optical filter, under test gas+standard carbon dioxide gas light path by measurement window both ends be equipped with centre wavelength be 4.26
The optical filter of micron, standard carbon dioxide gas are sealed in the measurement window of under test gas+standard carbon dioxide gas light path,
Reference path by be equipped with centre wavelength be 3.7 microns of optical filter the both ends of measurement window.
Step 106：The carbon dioxide gas for inputting known concentration, is arranged the calibration point of predetermined quantity, according to carbon dioxide
Relationship between concentration and penetrating light intensity establishes carbon dioxide concentration value table.
Wherein, the relationship between gas concentration lwevel and penetrating light intensity, determines especially by following formula：
The standard carbon dioxide gas C of known concentration is substituted into formula (1) to obtain：
TCO in formula2Indicate density of carbon dioxide gas value under test gas light path, rCO2It indicates in reference path
Density of carbon dioxide gas value, (t+s) CO2Indicate under test gas+standard two under test gas+standard carbon dioxide gas light path
The gas concentration of carbon oxide gas；cCO2Indicate the concentration of the standard carbon dioxide gas of known concentration, the mark of the known concentration
Quasi- carbon dioxide gas is for calibrating, ItIndicate the transmitted light intensity of under test gas light path, IrIndicate the transmitted light intensity of reference path,
Ic+sIt is the transmitted light intensity of under test gas+standard carbon dioxide gas.
Step 106 may comprise steps of：
Step 1062：Multiple calibration points are set, and calibration point includes 0 value, maximum value and limited a calibration point；
Step 1064：The carbon dioxide gas for inputting known concentration is obtained from 0~Max CO2In sectionList, wherein k takes 1,2,3 ..., MaxN, the data between calibration point pass through secondary song
The method of line difference obtains.MaxCO2It can rule of thumb be configured.
Step 1066：Establish the table for calculating and searching final carbon dioxide values.
The application considers to measure in the scheme of wavelength and reference wavelength, choosing on the basis of based on infrared spectrometry
One Measuring plate of increase on Measurement channel is selected, to realize single pass signal detection, in order to eliminate the consistency of light source not
Decaying when after foot and prolonged application, sets in this Measuring plate there are three measurement window, by three measurement windows by single-pass
Road light path is divided into three Measurement channels, wherein three windows are respectively the main measurement window being arranged under test gas light path, set
It sets the reference measure window in reference path and newly-increased one encapsulates under test gas+standard carbon dioxide gas light path
Know CO2The subsidiary window of concentration.
It is 4.26 microns of optical filters that the both ends of main measurement window, which are equipped with centre wavelength, during the both ends of subsidiary window are equipped with
The a length of 4.26 microns of optical filters of cardiac wave, it is 3.7 microns of optical filters that the both ends of reference measure window, which are equipped with centre wavelength,.Main measurement window
Air is encapsulated in mouth and reference measure window respectively, the CO of a certain concentration is full of in subsidiary window2Gas, to complete
The amplification of above-mentioned signal and subsequent processing, to obtain f (tCO2)∝It, f ((t+r) CO2)∝It+r, therefore,
Consider further that rCO2The uncertainty of concentration value carries out the calibration of calibrating gas in practice, that is, inputs dense known to one
The standard carbon dioxide gas C of degree, then have：
Wherein c can take in carbon dioxide measurement range, and include 0 value and maximum value, and its between limited calibration
Point, to obtain from 0-MaxCO2,List, wherein k takes 1,2,3 ..., MaxN, and school
Data between on schedule will be obtained by the method for conic section difference, and is established one and calculated and search final carbon dioxide values
Table, the final real-time measurement for realizing medical carbon dioxide concentration.
Step 108：Carbon dioxide concentration value table is inquired, and obtains the real-time survey of medical carbon dioxide concentration by calculating
Magnitude.
The foregoing is a further detailed description of the present application in conjunction with specific implementation manners, and it cannot be said that this Shen
Specific implementation please is confined to these explanations.For those of ordinary skill in the art to which this application belongs, it is not taking off
Under the premise of conceiving from the application, a number of simple deductions or replacements can also be made.
Claims (9)
1. a kind of medical respiration carbon dioxide concentration measurement system, including light source, gas chamber, the gas chamber is used to pass through gas to be measured
Body, the light source is for being radiated on the gas chamber to form light path, which is characterized in that further includes Measuring plate, detector and place
Manage device；The Measuring plate is equipped with multiple measurement windows, the calibrating gas of one of measurement window encapsulation known concentration, the survey
It measures disk to be arranged in the light path, monochromatic light road is divided into multiple Measurement channels, the detector has multiple, each detector difference
Coordinate with a Measurement channel, for obtaining the signal on Measurement channel, and send a signal to the processor and handled,
The processor is additionally operable to control light source.
2. the system as claimed in claim 1, which is characterized in that the measurement window includes three, and three measurement windows are by institute
It states monochromatic light road and is divided under test gas light path, under test gas+carbon dioxide calibrating gas light path and reference path.
3. system as claimed in claim 2, which is characterized in that the measurement window include be arranged in the Measuring plate it is logical
Hole and transparency cover, the transparency cover are arranged at the through-hole both ends.
4. system as claimed in claim 3, which is characterized in that the measurement window includes being arranged in the under test gas light path
On main measurement window, the reference measure window that is arranged in the reference path and be arranged in the under test gas+standard two
Subsidiary window in carbon oxide gas light path, the calibrating gas of the interior encapsulation known concentration of the subsidiary window.
5. system as claimed in claim 4, which is characterized in that encapsulated in the main measurement window and the reference measure window
Air encapsulates standard carbon dioxide gas in the subsidiary window.
6. the system as described in any one of claim 1 to 5, which is characterized in that during the both ends of the main measurement window are equipped with
The a length of 4.26 microns of optical filters of cardiac wave, it is 4.26 microns of optical filters, institute that the both ends of the subsidiary window, which are equipped with centre wavelength,
The both ends for stating reference measure window are equipped with centre wavelength as 3.7 microns of optical filters.
7. the system as described in any one of claim 1 to 5, which is characterized in that the Measuring plate is disk.
8. system as claimed in claim 7, which is characterized in that the measuring chamber is cylindrical.
9. the system as described in any one of claim 1 to 5, which is characterized in that further include that amplification turns with filter circuit, modulus
Change circuit, the signal that the detector obtains is sent out by the amplification and after filter circuit and analog-digital conversion circuit as described successively
Give the processor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810711887.3A CN108663341A (en) | 2018-06-29 | 2018-06-29 | A kind of medical respiration carbon dioxide concentration measurement system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810711887.3A CN108663341A (en) | 2018-06-29 | 2018-06-29 | A kind of medical respiration carbon dioxide concentration measurement system |
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| Publication Number | Publication Date |
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| CN108663341A true CN108663341A (en) | 2018-10-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810711887.3A Pending CN108663341A (en) | 2018-06-29 | 2018-06-29 | A kind of medical respiration carbon dioxide concentration measurement system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112763443A (en) * | 2020-12-02 | 2021-05-07 | 珠海格力电器股份有限公司 | Carbon dioxide sensor, calibration method and online detector |
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| JPH08247942A (en) * | 1995-03-10 | 1996-09-27 | Horiba Ltd | Infrared ray gas analyzer |
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| Publication number | Priority date | Publication date | Assignee | Title |
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