WO2020000361A1 - Medical respiratory carbon dioxide concentration measurement method and apparatus - Google Patents
Medical respiratory carbon dioxide concentration measurement method and apparatus Download PDFInfo
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- WO2020000361A1 WO2020000361A1 PCT/CN2018/093651 CN2018093651W WO2020000361A1 WO 2020000361 A1 WO2020000361 A1 WO 2020000361A1 CN 2018093651 W CN2018093651 W CN 2018093651W WO 2020000361 A1 WO2020000361 A1 WO 2020000361A1
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- G—PHYSICS
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- 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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- 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
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
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- the present application relates to the medical field, and in particular, to a method and device for measuring carbon dioxide concentration in medical breathing.
- Medical breathing carbon dioxide monitoring is one of the key parameters in modern clinical surgery and intensive care. It can be applied to multi-parameter breathing gas monitors, ventilator, anesthesia machines and respiratory gas special monitors. Among them, medical breathing heart carbon dioxide monitoring technology is Among the key core technologies, the medical breathing carbon dioxide concentration measurement technology currently used in the above-mentioned systems generally uses infrared spectral absorption technology. There are sidestream and mainstream implementation methods, and both need to perform zero calibration by entering the zero reference to achieve accuracy. Measurement.
- the common medical carbon dioxide gas measurement methods are based on the method of spectral absorption at 4.26 microns and non-absorption (reference) at 3.7 microns. Among them, there is a significant spectral absorption peak at 4.26 microns and no absorption at 3.7 microns ,expression: Among them, f (tCO 2 ) represents the carbon dioxide gas concentration to be measured, I t represents the transmitted light intensity of the measurement channel, and I r represents the transmitted light intensity of the reference channel. With the above ratio, the uncertainty or change in the initial incident light intensity is eliminated. The effect of the above equation and the appropriate algorithm can realize the real-time monitoring of the breathing carbon dioxide concentration. In the process of specific measurement implementation, zero calibration operation is needed. Where I z is the signal strength at zero calibration to eliminate the influence of the system reference.
- the measurement of carbon dioxide concentration in medical breathing is based on the calculation method of the ratio between the measurement wavelength channel and the reference wavelength channel.
- the difference between the two channels will also increase the measurement error, and it needs to perform a zero calibration operation at a regular time, which is inconvenient to apply.
- the application provides a method and a device for measuring the concentration of carbon dioxide in a medical breath.
- the present application provides a method for measuring carbon dioxide concentration in medical breathing, including:
- a measurement disk is provided on the measurement optical path, three measurement windows are provided on the measurement disk, and a carbon dioxide standard gas of a known concentration is sealed in one of the measurement windows;
- the single-channel optical path is divided into three measurement channels through the three measurement windows, and the measurement channel includes a gas path to be measured, a gas path to be measured + a carbon dioxide standard gas path, and a reference optical path;
- the present application provides a medical breathing carbon dioxide concentration measuring device, including:
- a sealed standard gas module configured to set a measurement disk on the measurement optical path, set three measurement windows on the measurement disk, and seal a carbon dioxide standard gas of a known concentration in one of the measurement windows;
- a measurement channel module for dividing a single-channel optical path into three measurement channels through the three measurement windows, the measurement channel including a gas path to be measured, a gas path to be measured + a carbon dioxide standard gas path, and a reference optical path;
- a processing module for inputting carbon dioxide gas of a known concentration, setting a predetermined number of calibration points, and establishing a table of carbon dioxide concentration values according to the relationship between the carbon dioxide concentration and the light transmission intensity;
- the query module is used to query a table of carbon dioxide concentration values and obtain real-time measurement values of medical carbon dioxide concentration through calculation.
- the single-channel optical path is divided into three measurements through the three measurement windows.
- the measurement channel includes the optical path of the gas to be measured, the optical path of the gas to be measured + carbon dioxide standard, and the reference optical path; when performing zero calibration in this application, it can be performed based on the known carbon dioxide standard gas concentration without introducing outside air as a zero reference
- the zero point calibration is performed to avoid the influence of zero offset caused by external zero reference gas on the measurement, to achieve the function of zero-free operation, and to improve the measurement stability.
- FIG. 1 is a flowchart of an embodiment of a method of the present application
- FIG. 2 is a schematic diagram of functional modules of an apparatus of this application in an embodiment
- FIG. 3 is a schematic diagram of the functional modules of the device of this application in another embodiment.
- FIG. 1 is a flowchart of a medical breathing carbon dioxide concentration measurement method provided in Embodiment 1 of the present invention.
- the execution subject of this embodiment may be a computer device or a functional unit in the computer device, including the following steps:
- Step 102 A measurement disk is set on the measurement optical path, three measurement windows are set on the measurement disk, and a carbon dioxide standard gas of a known concentration is sealed in one of the measurement windows.
- the measurement windows are all composed of hollow cylinders arranged on the measuring disc and transparent covers are respectively provided at both ends to ensure the symmetry of the light paths and ensure the three-way
- the optical path is the same, and the transparent cover can be made of transparent sapphire glass or other transparent materials.
- Step 104 The single-channel optical path is divided into three measurement channels through three measurement windows, and the measurement channels include the optical path of the gas to be measured, the optical path of the gas to be measured + carbon dioxide standard gas, and the reference optical path.
- a filter having a center wavelength of 4.26 micrometers is provided at both ends of the measurement window through which the gas path to be measured passes, and a center wavelength of 4.26 is provided at both ends of the measurement window through which the gas to be measured + standard carbon dioxide gas passes.
- a micron filter, the standard carbon dioxide gas is sealed in the measurement window of the gas to be measured + standard carbon dioxide gas optical path, and a filter with a center wavelength of 3.7 microns is provided at both ends of the measurement window through which the reference optical path passes.
- Step 106 input a carbon dioxide gas of a known concentration, set a predetermined number of calibration points, and establish a table of carbon dioxide concentration values according to the relationship between the carbon dioxide concentration and the light transmission intensity.
- Formula tCO 2 denotes a gas concentration measurement gas in the optical path of carbon dioxide
- rCO 2 represents the value of gas concentration in the reference light path dioxide
- (t + s) CO 2 represents a measurement gas + standard carbon dioxide gas in the optical path measurement gas + standard Gas concentration of carbon dioxide gas
- cCO 2 represents the concentration of a standard carbon dioxide gas of known concentration, which is used for calibration
- I t represents the transmitted light intensity of the optical path of the gas to be measured
- I r represents the transmission of the reference optical path Light intensity
- I c + s is the transmitted light intensity of the test gas + standard carbon dioxide gas.
- Step 106 may include the following steps:
- Step 1062 set multiple calibration points, the calibration points include a zero value, a maximum value, and a limited number of calibration points;
- Step 1064 the carbon dioxide gas entering the known concentration obtained from 0 ⁇ Max CO 2 interval , Where k is 1, 2, 3, ..., MaxN, and the data between the calibration points is obtained by the method of the difference of the quadratic curve.
- Max CO 2 can be set based on experience.
- Step 1066 Create a table to calculate and find the final carbon dioxide value.
- a measurement disk is added to the measurement channel to achieve single-channel signal detection.
- the single-channel optical path is divided into three measurement channels through the three measurement windows.
- the three windows are the main measurement windows set on the optical path of the gas to be measured. 2.
- a filter with a center wavelength of 4.26 microns is provided at both ends of the main measurement window, and a filter with a center wavelength of 4.26 microns is provided at both ends of the auxiliary measurement window.
- the main measurement window and the reference measurement window are respectively encapsulated with air, and the auxiliary measurement window is filled with a specific concentration of CO 2 gas to complete the above signal amplification and subsequent processing to obtain f (tCO 2 ) ⁇ I t , f ( (t + r) CO 2 ) ⁇ I t + r , therefore,
- the calibration of the standard gas in practice that is, inputting a standard carbon dioxide gas C of known concentration, has:
- c can be taken within the measurement range of carbon dioxide, and contains the value of 0 and the maximum value, and a limited number of calibration points between them, so as to obtain from 0-MaxCO2, List, where k is 1, 2, 3, ..., MaxN, and the data between the calibration points will be obtained by the difference of the quadratic curve method, and a table for calculating and finding the final carbon dioxide value will be established. , Finally real-time measurement of medical carbon dioxide concentration.
- Step 108 Query the carbon dioxide concentration value table, and obtain a real-time measurement value of the medical carbon dioxide concentration through calculation.
- FIG. 2 is a schematic structural diagram of a medical breathing carbon dioxide concentration obtaining device provided in Embodiment 2 of the present invention.
- the medical breathing carbon dioxide concentration acquiring device illustrated in FIG. 2 may be an execution subject of the medical breathing carbon dioxide concentration acquiring method provided in the foregoing first embodiment, and may be a computer device or a functional unit in the computer device.
- the medical breathing carbon dioxide concentration acquisition device may specifically include a sealed standard gas module, a measurement channel module, a processing module and an inquiry module.
- the sealed standard gas module is used to set a measuring disc on the measuring optical path, set three measuring windows on the measuring disc, and seal a known concentration of carbon dioxide standard gas in one of the measuring windows;
- the measurement channels include the optical path of the gas to be measured, the optical path of the gas to be measured + carbon dioxide standard gas, and the reference optical path;
- a processing module for inputting carbon dioxide gas of a known concentration, setting a predetermined number of calibration points, and establishing a table of carbon dioxide concentration values according to the relationship between the carbon dioxide concentration and the light transmission intensity;
- the query module is used to query a table of carbon dioxide concentration values and obtain real-time measurement values of medical carbon dioxide concentration through calculation.
- a measurement disk is added to the measurement channel to achieve single-channel signal detection.
- the single-channel optical path is divided into three measurement channels through the three measurement windows.
- the three windows are the main measurement windows set on the optical path of the gas to be measured. 3.
- a filter having a center wavelength of 4.26 micrometers is provided at both ends of the measurement window through which the optical path of the gas to be measured passes, and a center wavelength is provided at both ends of the measurement window through which the gas to be measured + standard carbon dioxide gas passes It is a 4.26 micron filter, the standard carbon dioxide gas is sealed in the measurement window of the gas to be measured + standard carbon dioxide gas optical path, and a filter with a center wavelength of 3.7 microns is provided at both ends of the measurement window through which the reference optical path passes. Light film.
- the relationship between the carbon dioxide concentration and the light transmission intensity is specifically determined by the following formula:
- tCO 2 represents the carbon dioxide gas concentration value to be measured
- rCO 2 represents the carbon dioxide gas concentration value in the reference optical path
- (t + s) CO 2 represents the gas to be measured + standard carbon dioxide gas in the optical path.
- Concentration; cCO 2 represents the concentration of a standard carbon dioxide gas of known concentration
- I t represents the transmitted light intensity of the optical path of the gas to be measured
- I r represents the transmitted light intensity of the reference optical path
- I c + s is (the measured gas + standard carbon dioxide gas ) Transmitted light intensity.
- the processing module includes a calibration point setting unit, a processing unit, and a form generating unit.
- a calibration point setting unit for setting multiple calibration points the calibration points include a zero value, a maximum value, and a limited number of calibration points;
- Processing means for inputting a known concentration of carbon dioxide gas is obtained from the interval 0 ⁇ Max CO 2 in List, where k is 1, 2, 3, ..., MaxN, and the data between the calibration points is obtained by the method of the difference of the quadratic curve;
- a table generation unit is used to create a table for calculating and finding the final carbon dioxide value.
- the program may be stored in a computer-readable storage medium.
- the storage medium may include a read-only memory, RAM, disk or CD, etc.
Abstract
Provided is a medical respiratory carbon dioxide concentration measurement method. The method comprises: arranging a measurement disk on a measurement light path and three measurement windows on the measurement disk, and sealing the known concentration of carbon dioxide standard gas in one of the measurement windows (102); dividing the single-channel light path into three measurement channels through the three measurement windows (104); introducing the known concentration of carbon dioxide gas, setting a predetermined number of calibration points, and creating a table of carbon dioxide concentrations according to the relationship between carbon dioxide concentration and light transmittance intensity (106); and querying the table of carbon dioxide concentrations and acquiring a real-time measurement value of a medical carbon dioxide concentration by calculation (108). By means of the medical respiratory carbon dioxide concentration measurement method, zero point correction can be carried out in accordance with the known concentration of carbon dioxide standard gas without the introduction of external air as the zero reference point, so that the impact of zero point deviation caused by the external zero reference gas on the measurement is avoided, realizing the function of operation free of zero correction, and improving the stability of the measurement.
Description
本申请涉及医疗领域，尤其涉及一种医用呼吸二氧化碳浓度测量方法及装置。The present application relates to the medical field, and in particular, to a method and device for measuring carbon dioxide concentration in medical breathing.
医用呼吸二氧化碳监测是现代临床手术中、重症监护中的关键参数之一，可以应用于多参数呼吸气体监护仪，呼吸机，麻醉机和呼吸气体专用监护仪中，其中医用呼吸心二氧化碳监测技术是其中的关键核心技术，目前应用在上述系统中的医用呼吸二氧化碳浓度测量技术通常是采用红外光谱吸收的技术，有旁流和主流的实现方式，都需要进行输入零参考的校零操作才能实现准确的测量。Medical breathing carbon dioxide monitoring is one of the key parameters in modern clinical surgery and intensive care. It can be applied to multi-parameter breathing gas monitors, ventilator, anesthesia machines and respiratory gas special monitors. Among them, medical breathing heart carbon dioxide monitoring technology is Among the key core technologies, the medical breathing carbon dioxide concentration measurement technology currently used in the above-mentioned systems generally uses infrared spectral absorption technology. There are sidestream and mainstream implementation methods, and both need to perform zero calibration by entering the zero reference to achieve accuracy. Measurement.
目前常见医用二氧化碳气体测量方法都是采用基于4.26微米处的光谱吸收和3.7微米处的无吸收(参考)的方法来实现的，其中4.26微米处存在一个显著性光谱吸收峰，3.7微米处没有吸收，表达式：
其中，f(tCO
2)表示待测的二氧化碳气体浓度，I
t表示测量通道的透射光强，I
r表示参考通道的透射光强，通过上述的比值，则消除初始入射光强的不定或变化的影响，通过上式的比值，以及适当的算法则能实现呼吸二氧化碳浓度的实时监测，在具体测量实现的过程中需要进行校零操作，
其中I
z是校零时的信号强度，以消除系统基准的影响。
At present, the common medical carbon dioxide gas measurement methods are based on the method of spectral absorption at 4.26 microns and non-absorption (reference) at 3.7 microns. Among them, there is a significant spectral absorption peak at 4.26 microns and no absorption at 3.7 microns ,expression: Among them, f (tCO 2 ) represents the carbon dioxide gas concentration to be measured, I t represents the transmitted light intensity of the measurement channel, and I r represents the transmitted light intensity of the reference channel. With the above ratio, the uncertainty or change in the initial incident light intensity is eliminated. The effect of the above equation and the appropriate algorithm can realize the real-time monitoring of the breathing carbon dioxide concentration. In the process of specific measurement implementation, zero calibration operation is needed. Where I z is the signal strength at zero calibration to eliminate the influence of the system reference.
目前医用呼吸二氧化碳浓度测量是基于测量波长通道与参考波长通道的比值的计算方法，双通道的差异性也会增加测量误差，需要定时的校零操作，应用不方便。At present, the measurement of carbon dioxide concentration in medical breathing is based on the calculation method of the ratio between the measurement wavelength channel and the reference wavelength channel. The difference between the two channels will also increase the measurement error, and it needs to perform a zero calibration operation at a regular time, which is inconvenient to apply.
发明内容Summary of the invention
本申请提供一种医用呼吸二氧化碳浓度测量方法及装置。The application provides a method and a device for measuring the concentration of carbon dioxide in a medical breath.
根据本申请的第一方面，本申请提供一种医用呼吸二氧化碳浓度测量方法，包括：According to a first aspect of the present application, the present application provides a method for measuring carbon dioxide concentration in medical breathing, including:
在测量光路上设置一测量盘，在所述测量盘上设置三个测量窗口，并在其中一个测量窗口中密封已知浓度的二氧化碳标准气体；A measurement disk is provided on the measurement optical path, three measurement windows are provided on the measurement disk, and a carbon dioxide standard gas of a known concentration is sealed in one of the measurement windows;
通过所述三个测量窗口将单通道光路分为三个测量通道，所述测量通道包括待测气体光路、待测气体+二氧化碳标准气体光路和参考光路；The single-channel optical path is divided into three measurement channels through the three measurement windows, and the measurement channel includes a gas path to be measured, a gas path to be measured + a carbon dioxide standard gas path, and a reference optical path;
输入已知浓度的二氧化碳气体，设置预定数量的校准点，根据二氧化碳浓度和透光强度之间的关系，建立二氧化碳浓度值表格；Enter a known concentration of carbon dioxide gas, set a predetermined number of calibration points, and create a table of carbon dioxide concentration values based on the relationship between carbon dioxide concentration and light transmission intensity;
查询所述二氧化碳浓度值表格，并通过计算获取医用二氧化碳浓度的实时测量值。Query the carbon dioxide concentration value table, and obtain a real-time measurement value of medical carbon dioxide concentration through calculation.
根据本申请的第二方面，本申请提供一种医用呼吸二氧化碳浓度测量装置，包括：According to a second aspect of the present application, the present application provides a medical breathing carbon dioxide concentration measuring device, including:
密封标准气体模块，用于在测量光路上设置一测量盘，在所述测量盘上设置三个测量窗口，并在其中一个测量窗口中密封已知浓度的二氧化碳标准气体；A sealed standard gas module, configured to set a measurement disk on the measurement optical path, set three measurement windows on the measurement disk, and seal a carbon dioxide standard gas of a known concentration in one of the measurement windows;
设置测量通道模块，用于通过所述三个测量窗口将单通道光路分为三个测量通道，所述测量通道包括待测气体光路、待测气体+二氧化碳标准气体光路和参考光路；Setting a measurement channel module for dividing a single-channel optical path into three measurement channels through the three measurement windows, the measurement channel including a gas path to be measured, a gas path to be measured + a carbon dioxide standard gas path, and a reference optical path;
处理模块，用于输入已知浓度的二氧化碳气体，设置预定数量的校准点，根据二氧化碳浓度和透光强度之间的关系，建立二氧化碳浓度值表格；A processing module for inputting carbon dioxide gas of a known concentration, setting a predetermined number of calibration points, and establishing a table of carbon dioxide concentration values according to the relationship between the carbon dioxide concentration and the light transmission intensity;
查询模块，用于查询二氧化碳浓度值表格，并通过计算获取医用二氧化碳浓度的实时测量值。The query module is used to query a table of carbon dioxide concentration values and obtain real-time measurement values of medical carbon dioxide concentration through calculation.
在本申请的具体实施方式中，由于在测量盘上设置三个测量室，并在其中一个测量窗口中密封已知浓度的二氧化碳标准气体，通过三个测量窗口将单通道光路分为三个测量通道，测量通道包括待测气体光路、待测气体+二氧化碳标准气体光路和参考光路；本申请进行零点校正时，可依据该已知的二氧化碳标准气体浓度进行，而无需引入外界的空气作为零参考点进行零点校正，避免了外部零参考气体引起的零点偏移对测量的影响，实现无校零操作功能，提高了测量的稳定性。In the specific implementation of the present application, since three measurement chambers are provided on the measurement disk, and a carbon dioxide standard gas of a known concentration is sealed in one of the measurement windows, the single-channel optical path is divided into three measurements through the three measurement windows. Channel, the measurement channel includes the optical path of the gas to be measured, the optical path of the gas to be measured + carbon dioxide standard, and the reference optical path; when performing zero calibration in this application, it can be performed based on the known carbon dioxide standard gas concentration without introducing outside air as a zero reference The zero point calibration is performed to avoid the influence of zero offset caused by external zero reference gas on the measurement, to achieve the function of zero-free operation, and to improve the measurement stability.
图1为本申请的方法在一种实施方式中的流程图；FIG. 1 is a flowchart of an embodiment of a method of the present application;
图2为本申请的装置在一种实施方式中的功能模块示意图；FIG. 2 is a schematic diagram of functional modules of an apparatus of this application in an embodiment; FIG.
图3为本申请的装置在另一种实施方式中的功能模块示意图。FIG. 3 is a schematic diagram of the functional modules of the device of this application in another embodiment.
下面通过具体实施方式结合附图对本申请作进一步详细说明。The present application will be further described in detail below through specific embodiments in combination with the accompanying drawings.
实施例一：Embodiment one:
图1是本发明实施例一提供的医用呼吸二氧化碳浓度测量方法的流程图，本实施例的执行主体可以是计算机设备或者计算机设备中的一个功能单元，包括以下步骤：FIG. 1 is a flowchart of a medical breathing carbon dioxide concentration measurement method provided in Embodiment 1 of the present invention. The execution subject of this embodiment may be a computer device or a functional unit in the computer device, including the following steps:
步骤102：在测量光路上设置一测量盘，测量盘上设置三个测量窗口，并在其中一个测量窗口中密封已知浓度的二氧化碳标准气体。Step 102: A measurement disk is set on the measurement optical path, three measurement windows are set on the measurement disk, and a carbon dioxide standard gas of a known concentration is sealed in one of the measurement windows.
在测量盘上设置三个测量窗口，具体可通过在测量盘上设置三个通孔，并在通孔两端设置透明盖来实现。在一种实施方式中，考虑到光路的一致性，测量窗口均为设置在测量盘上的中空的圆柱体并分别在两端设置透明盖组成，以保证光路的对称性，并保证三路的光程一致，透明盖可选用透明宝石玻璃或其他透明材料。Three measuring windows are set on the measuring plate, which can be achieved by setting three through holes in the measuring plate and setting transparent covers at both ends of the through holes. In one embodiment, in consideration of the consistency of the light paths, the measurement windows are all composed of hollow cylinders arranged on the measuring disc and transparent covers are respectively provided at both ends to ensure the symmetry of the light paths and ensure the three-way The optical path is the same, and the transparent cover can be made of transparent sapphire glass or other transparent materials.
步骤104：通过三个测量窗口将单通道光路分为三个测量通道，测量通道包括待测气体光路、待测气体+二氧化碳标准气体光路和参考光路。Step 104: The single-channel optical path is divided into three measurement channels through three measurement windows, and the measurement channels include the optical path of the gas to be measured, the optical path of the gas to be measured + carbon dioxide standard gas, and the reference optical path.
在一种实施方式中，待测气体光路通过的测量窗口的两端设有中心波长为4.26微米滤光片，待测气体+标准二氧化碳气体光路通过的测量窗口的两端设有中心波长为4.26微米的滤光片，标准二氧化碳气体密封在待测气体+标准二氧化碳气体光路的测量窗口中，参考光路通过的测量窗口的两端设有中心波长为3.7微米的滤光片。In one embodiment, a filter having a center wavelength of 4.26 micrometers is provided at both ends of the measurement window through which the gas path to be measured passes, and a center wavelength of 4.26 is provided at both ends of the measurement window through which the gas to be measured + standard carbon dioxide gas passes. A micron filter, the standard carbon dioxide gas is sealed in the measurement window of the gas to be measured + standard carbon dioxide gas optical path, and a filter with a center wavelength of 3.7 microns is provided at both ends of the measurement window through which the reference optical path passes.
步骤106：输入已知浓度的二氧化碳气体，设置预定数量的校准点，根据二氧化碳浓度和透光强度之间的关系，建立二氧化碳浓度值表格。Step 106: input a carbon dioxide gas of a known concentration, set a predetermined number of calibration points, and establish a table of carbon dioxide concentration values according to the relationship between the carbon dioxide concentration and the light transmission intensity.
其中，二氧化碳浓度和透光强度之间的关系，具体通过以下公式确定：The relationship between carbon dioxide concentration and light transmission intensity is determined by the following formula:
将已知浓度的标准二氧化碳气体C代入公式(1)得：Substituting standard carbon dioxide gas C of known concentration into formula (1) gives:
公式中的tCO
2表示待测气体光路中二氧化碳气体浓度值，rCO
2表示参考光路中的二氧化碳气体浓度值,(t+s)CO
2表示待测气体+标准二氧化碳气体光路中待测气体+标准二氧化碳气体的气体浓度；cCO
2表示已知浓度的标准二氧化碳气体的浓度，该已知浓度的标准二氧化碳气体用于校准，I
t表示待测气体光路的透射光强，I
r表示参考光路的透射光强，I
c+s是待测气体+标准二氧化碳气体的透射光强。
Formula tCO 2 denotes a gas concentration measurement gas in the optical path of carbon dioxide, rCO 2 represents the value of gas concentration in the reference light path dioxide, (t + s) CO 2 represents a measurement gas + standard carbon dioxide gas in the optical path measurement gas + standard Gas concentration of carbon dioxide gas; cCO 2 represents the concentration of a standard carbon dioxide gas of known concentration, which is used for calibration, I t represents the transmitted light intensity of the optical path of the gas to be measured, and I r represents the transmission of the reference optical path Light intensity, I c + s is the transmitted light intensity of the test gas + standard carbon dioxide gas.
步骤106可以包括以下步骤： Step 106 may include the following steps:
步骤1062：设置多个校准点，校准点包括0值、最大值和有限个校准点；Step 1062: set multiple calibration points, the calibration points include a zero value, a maximum value, and a limited number of calibration points;
步骤1064：输入已知浓度的二氧化碳气体获得从0～Max CO
2区间中 的
的列表，其中k取1、2、3、......、MaxN，校准点之间的数据通过二次曲线差值的方法获取。Max CO
2可以根据经验进行设置。
Step 1064: the carbon dioxide gas entering the known concentration obtained from 0 ~ Max CO 2 interval , Where k is 1, 2, 3, ..., MaxN, and the data between the calibration points is obtained by the method of the difference of the quadratic curve. Max CO 2 can be set based on experience.
步骤1066：建立计算和查找最终二氧化碳值的表格。Step 1066: Create a table to calculate and find the final carbon dioxide value.
本申请在基于红外光谱测量的基础上，并考虑测量波长和参考波长的方案上，选择了在测量通道上增加一个测量盘，以实现单通道的信号检测，为了消除光源的一致性不足和长期应用后时的衰减，在这个测量盘上设有三个测量窗口，通过三个测量窗口将单通道光路分为三个测量通道，其中三个窗口分别为设置在待测气体光路上的主测量窗口、设置在参考光路上的参考测量窗口及新增一个在待测气体+标准二氧化碳气体光路上封装已知CO
2浓度的辅助测量窗口。
In this application, based on the infrared spectrum measurement and considering the measurement wavelength and reference wavelength, a measurement disk is added to the measurement channel to achieve single-channel signal detection. In order to eliminate the lack of consistency of the light source and long-term Attenuation after application. There are three measurement windows on this measuring disk. The single-channel optical path is divided into three measurement channels through the three measurement windows. The three windows are the main measurement windows set on the optical path of the gas to be measured. 2. Set a reference measurement window on the reference optical path and add a new auxiliary measurement window that encapsulates the known CO 2 concentration on the optical path of the gas to be measured + standard carbon dioxide gas.
主测量窗口的两端设有中心波长为4.26微米滤光片，辅助测量窗口的两端设有中心波长为4.26微米滤光片，参考测量窗口的两端设有中心波长为3.7微米滤光片。主测量窗口和参考测量窗口中分别封装空气，辅助测量窗口中充满一个特定浓度的CO
2气体，以完成上述信号的放大，以及后续的处理，从而获得f(tCO
2)∝I
t，f((t+r)CO
2)∝I
t+r，因此，
A filter with a center wavelength of 4.26 microns is provided at both ends of the main measurement window, and a filter with a center wavelength of 4.26 microns is provided at both ends of the auxiliary measurement window. . The main measurement window and the reference measurement window are respectively encapsulated with air, and the auxiliary measurement window is filled with a specific concentration of CO 2 gas to complete the above signal amplification and subsequent processing to obtain f (tCO 2 ) ∝I t , f ( (t + r) CO 2 ) ∝I t + r , therefore,
再考虑到rCO
2浓度值的不确定性，实际中进行标准气体的校准，即输入一已知浓度的标准二氧化碳气体C，则有：
Taking into account the uncertainty of the rCO 2 concentration value, the calibration of the standard gas in practice, that is, inputting a standard carbon dioxide gas C of known concentration, has:
其中c可以取二氧化碳测量范围内，并包含0值和最大值，及其之间的有限个校准点，从而获得从0-MaxCO2，
的列表，其中k取1、2、3、......、MaxN，而校准点之间的数据将通过二次曲线差值的方法获取，并建立一个计算和查找最终二氧化碳值的表格，最终 实现医用二氧化碳浓度的实时测量。
Where c can be taken within the measurement range of carbon dioxide, and contains the value of 0 and the maximum value, and a limited number of calibration points between them, so as to obtain from 0-MaxCO2, List, where k is 1, 2, 3, ..., MaxN, and the data between the calibration points will be obtained by the difference of the quadratic curve method, and a table for calculating and finding the final carbon dioxide value will be established. , Finally real-time measurement of medical carbon dioxide concentration.
步骤108：查询二氧化碳浓度值表格，并通过计算获取医用二氧化碳浓度的实时测量值。Step 108: Query the carbon dioxide concentration value table, and obtain a real-time measurement value of the medical carbon dioxide concentration through calculation.
实施例二：Embodiment two:
图2是本发明实施例二提供的医用呼吸二氧化碳浓度获取装置的结构示意图，为了便于说明，仅示出了与本发明实施例相关的部分。图2示例的医用呼吸二氧化碳浓度获取装置可以是前述实施例一提供的医用呼吸二氧化碳浓度获取方法的执行主体，其可以是计算机设备或者计算机设备中的一个功能单元。该医用呼吸二氧化碳浓度获取装置，具体可以包括密封标准气体模块、设置测量通道模块、处理模块和查询模块。FIG. 2 is a schematic structural diagram of a medical breathing carbon dioxide concentration obtaining device provided in Embodiment 2 of the present invention. For ease of description, only parts related to the embodiment of the present invention are shown. The medical breathing carbon dioxide concentration acquiring device illustrated in FIG. 2 may be an execution subject of the medical breathing carbon dioxide concentration acquiring method provided in the foregoing first embodiment, and may be a computer device or a functional unit in the computer device. The medical breathing carbon dioxide concentration acquisition device may specifically include a sealed standard gas module, a measurement channel module, a processing module and an inquiry module.
密封标准气体模块，用于在测量光路上设置一测量盘，在测量盘上设置三个测量窗口，并在其中一个测量窗口中密封已知浓度的二氧化碳标准气体；The sealed standard gas module is used to set a measuring disc on the measuring optical path, set three measuring windows on the measuring disc, and seal a known concentration of carbon dioxide standard gas in one of the measuring windows;
设置测量通道模块，用于通过三个测量窗口将单通道光路分为三个测量通道，测量通道包括待测气体光路、待测气体+二氧化碳标准气体光路和参考光路；Set a measurement channel module, which is used to divide the single-channel optical path into three measurement channels through three measurement windows. The measurement channels include the optical path of the gas to be measured, the optical path of the gas to be measured + carbon dioxide standard gas, and the reference optical path;
处理模块，用于输入已知浓度的二氧化碳气体，设置预定数量的校准点，根据二氧化碳浓度和透光强度之间的关系，建立二氧化碳浓度值表格；A processing module for inputting carbon dioxide gas of a known concentration, setting a predetermined number of calibration points, and establishing a table of carbon dioxide concentration values according to the relationship between the carbon dioxide concentration and the light transmission intensity;
查询模块，用于查询二氧化碳浓度值表格，并通过计算获取医用二氧化碳浓度的实时测量值。The query module is used to query a table of carbon dioxide concentration values and obtain real-time measurement values of medical carbon dioxide concentration through calculation.
本申请在基于红外光谱测量的基础上，并考虑测量波长和参考波长的方案上，选择了在测量通道上增加一个测量盘，以实现单通道的信号检测，为了消除光源的一致性不足和长期应用后时的衰减，在这个测量盘上设有三个测量窗口，通过三个测量窗口将单通道光路分为三个测量 通道，其中三个窗口分别为设置在待测气体光路上的主测量窗口、设置在参考光路上的参考测量窗口及新增一个在待测气体+标准二氧化碳气体光路上封装已知CO
2浓度的辅助测量窗口用。
In this application, based on the infrared spectrum measurement and considering the measurement wavelength and reference wavelength, a measurement disk is added to the measurement channel to achieve single-channel signal detection. In order to eliminate the lack of consistency of the light source and long-term Attenuation after application. There are three measurement windows on this measuring disk. The single-channel optical path is divided into three measurement channels through the three measurement windows. The three windows are the main measurement windows set on the optical path of the gas to be measured. 3. Set a reference measurement window on the reference optical path and add an auxiliary measurement window for packaging the known CO 2 concentration on the optical path of the gas to be measured + standard carbon dioxide gas.
在一种实施方式中，待测气体光路通过的测量窗口的两端设有中心波长为4.26微米滤光片，所述待测气体+标准二氧化碳气体光路通过的测量窗口的两端设有中心波长为4.26微米的滤光片，所述标准二氧化碳气体密封在所述待测气体+标准二氧化碳气体光路的测量窗口中，所述参考光路通过的测量窗口的两端设有中心波长为3.7微米的滤光片。In one embodiment, a filter having a center wavelength of 4.26 micrometers is provided at both ends of the measurement window through which the optical path of the gas to be measured passes, and a center wavelength is provided at both ends of the measurement window through which the gas to be measured + standard carbon dioxide gas passes It is a 4.26 micron filter, the standard carbon dioxide gas is sealed in the measurement window of the gas to be measured + standard carbon dioxide gas optical path, and a filter with a center wavelength of 3.7 microns is provided at both ends of the measurement window through which the reference optical path passes. Light film.
在一种实施方式中，二氧化碳浓度和透光强度之间的关系，具体通过以下公式确定：In one embodiment, the relationship between the carbon dioxide concentration and the light transmission intensity is specifically determined by the following formula:
将已知浓度的标准二氧化碳气体C代入公式(1)得：Substituting standard carbon dioxide gas C of known concentration into formula (1) gives:
其中，tCO
2表示待测二氧化碳气体浓度值，rCO
2表示参考光路中的二氧化碳气体浓度值,(t+s)CO
2表示待测气体+标准二氧化碳气体光路中待测气体+标准二氧化碳气体的气体浓度；cCO
2表示已知浓度的标准二氧化碳气体的浓度，I
t表示待测气体光路的透射光强，I
r表示参考光路的透射光强，I
c+s是(待测气体+标准二氧化碳气体)的透射光强。
Among them, tCO 2 represents the carbon dioxide gas concentration value to be measured, rCO 2 represents the carbon dioxide gas concentration value in the reference optical path, and (t + s) CO 2 represents the gas to be measured + standard carbon dioxide gas in the optical path. Concentration; cCO 2 represents the concentration of a standard carbon dioxide gas of known concentration, I t represents the transmitted light intensity of the optical path of the gas to be measured, I r represents the transmitted light intensity of the reference optical path, and I c + s is (the measured gas + standard carbon dioxide gas ) Transmitted light intensity.
如图3所示，本申请的医用呼吸二氧化碳浓度获取装置，其另一种实施方式中，处理模块包括校准点设置单元、处理单元和表格生成单元。As shown in FIG. 3, in another embodiment of the medical breathing carbon dioxide concentration acquisition device of the present application, the processing module includes a calibration point setting unit, a processing unit, and a form generating unit.
校准点设置单元，用于设置多个校准点，校准点包括0值、最大值和有限个校准点；A calibration point setting unit for setting multiple calibration points, the calibration points include a zero value, a maximum value, and a limited number of calibration points;
处理单元，用于输入已知浓度的二氧化碳气体获得从0～Max CO
2区间中的
的列表，其中k取1、2、3、......、MaxN，校 准点之间的数据通过二次曲线差值的方法获取；
Processing means for inputting a known concentration of carbon dioxide gas is obtained from the interval 0 ~ Max CO 2 in List, where k is 1, 2, 3, ..., MaxN, and the data between the calibration points is obtained by the method of the difference of the quadratic curve;
表格生成单元，用于建立用于计算和查找最终二氧化碳值的表格。A table generation unit is used to create a table for calculating and finding the final carbon dioxide value.
本领域技术人员可以理解，上述实施方式中各种方法的全部或部分步骤可以通过程序来指令相关硬件完成，该程序可以存储于一计算机可读存储介质中，存储介质可以包括：只读存储器、随机存储器、磁盘或光盘等。Those skilled in the art may understand that all or part of the steps of the various methods in the foregoing embodiments may be completed by a program instructing related hardware. The program may be stored in a computer-readable storage medium. The storage medium may include a read-only memory, RAM, disk or CD, etc.
以上内容是结合具体的实施方式对本申请所作的进一步详细说明，不能认定本申请的具体实施只局限于这些说明。对于本申请所属技术领域的普通技术人员来说，在不脱离本申请构思的前提下，还可以做出若干简单推演或替换。The above content is a further detailed description of the present application in combination with specific embodiments, and it cannot be considered that the specific implementation of the present application is limited to these descriptions. For those of ordinary skill in the technical field to which this application belongs, without departing from the concept of the present application, several simple deductions or replacements can also be made.
Claims (10)
- 一种医用呼吸二氧化碳浓度测量方法，其特征在于，包括：A method for measuring the carbon dioxide concentration of a medical breath, comprising:在测量光路上设置一测量盘，在所述测量盘上设置三个测量窗口，并在其中一个测量窗口中密封已知浓度的二氧化碳标准气体；A measurement disk is provided on the measurement optical path, three measurement windows are provided on the measurement disk, and a carbon dioxide standard gas of a known concentration is sealed in one of the measurement windows;通过所述三个测量窗口将单通道光路分为三个测量通道，所述测量通道包括待测气体光路、待测气体+二氧化碳标准气体光路和参考光路；The single-channel optical path is divided into three measurement channels through the three measurement windows, and the measurement channel includes a gas path to be measured, a gas path to be measured + a carbon dioxide standard gas path, and a reference optical path;输入已知浓度的二氧化碳气体，设置预定数量的校准点，根据二氧化碳浓度和透光强度之间的关系，建立二氧化碳浓度值表格；Enter a known concentration of carbon dioxide gas, set a predetermined number of calibration points, and create a table of carbon dioxide concentration values based on the relationship between carbon dioxide concentration and light transmission intensity;查询所述二氧化碳浓度值表格，并通过计算获取医用二氧化碳浓度的实时测量值。Query the carbon dioxide concentration value table, and obtain a real-time measurement value of medical carbon dioxide concentration through calculation.
- 如权利要求1所述的方法，其特征在于，所述在所述测量盘上设置三个测量室，包括：The method according to claim 1, wherein the setting of three measurement chambers on the measurement disc comprises:在所述测量盘上设置三个通孔，并在所述通孔两端设置透明盖。Three through holes are provided on the measuring disc, and transparent covers are provided at both ends of the through holes.
- 如权利要求2所述的方法，其特征在于，所述待测气体光路通过的测量窗口的两端设有中心波长为4.26微米的滤光片，所述待测气体+标准二氧化碳气体光路通过的测量窗口的两端设有中心波长为4.26微米的滤光片，所述标准二氧化碳气体密封在所述待测气体+标准二氧化碳气体光路的测量窗口中，所述参考光路通过的测量窗口的两端设有中心波长为3.7微米的滤光片。The method according to claim 2, wherein a filter having a center wavelength of 4.26 microns is provided at both ends of the measurement window through which the optical path of the gas to be measured passes, and the optical path through which the gas to be measured + standard carbon dioxide gas passes A filter with a center wavelength of 4.26 microns is provided at both ends of the measurement window, the standard carbon dioxide gas is sealed in the measurement window of the gas to be measured + standard carbon dioxide gas optical path, and both ends of the measurement window through which the reference optical path passes A filter with a center wavelength of 3.7 microns is provided.
- 如权利要求1所述的方法，其特征在于，所述二氧化碳浓度和透光强度之间的关系，具体通过以下公式确定：The method according to claim 1, wherein the relationship between the carbon dioxide concentration and the light transmission intensity is specifically determined by the following formula:
将已知浓度的标准二氧化碳气体C代入公式(1)得：Substituting standard carbon dioxide gas C of known concentration into formula (1) gives:
其中，tCO 2表示所述待测气体光路中二氧化碳气体浓度值，rCO 2表示所述参考光路中的二氧化碳气体浓度值，(t+s)CO 2表示所述待测气体+标准二氧化碳气体光路中待测气体+标准二氧化碳气体的气体浓度；cCO 2表示已知浓度的标准二氧化碳气体的浓度，I t表示待测气体光路的透射光强，I r表示参考光路的透射光强，I c+s是待测气体+标准二氧化碳气体的透射光强。 Wherein, tCO 2 represents the concentration of carbon dioxide gas in the optical path of the gas to be measured, rCO 2 represents the concentration of carbon dioxide gas in the reference optical path, and (t + s) CO 2 represents the optical path of the gas to be measured + standard carbon dioxide gas. Gas concentration of the test gas + standard carbon dioxide gas; cCO 2 represents the concentration of the standard carbon dioxide gas of known concentration, I t represents the transmitted light intensity of the optical path of the gas to be measured, I r represents the transmitted light intensity of the reference optical path, and I c + s It is the transmitted light intensity of the test gas + standard carbon dioxide gas. - 如权利要求4所述的方法，其特征在于，所述输入已知浓度的二氧化碳气体，设置预定数量的校准点，根据二氧化碳浓度和透光强度之间的关系，建立二氧化碳浓度值表格，包括：The method according to claim 4, wherein said inputting a carbon dioxide gas of a known concentration, setting a predetermined number of calibration points, and establishing a table of carbon dioxide concentration values based on the relationship between the carbon dioxide concentration and the light transmission intensity, comprises:设置多个校准点，所述校准点包括0值、最大值和有限个校准点；Setting multiple calibration points, the calibration points including a zero value, a maximum value, and a limited number of calibration points;输入已知浓度的二氧化碳气体获得从0～MaxCO 2区间中的的列表，其中k取1、2、3、……、MaxN，校准点之间的数据通过二次曲线差值的方法获取； Enter a known concentration of carbon dioxide gas to get the range from 0 to MaxCO 2
, Where k is 1, 2, 3, ..., MaxN, and the data between the calibration points is obtained by the method of the difference of the quadratic curve;建立计算和查找最终二氧化碳值的表格。Create tables to calculate and find the final carbon dioxide value. - 一种医用呼吸二氧化碳浓度测量装置，其特征在于，包括：A medical breathing carbon dioxide concentration measuring device, comprising:密封标准气体模块，用于在测量光路上设置一测量盘，在所述测量盘上设置三个测量窗口，并在其中一个测量窗口中密封已知浓度的二氧化碳标准气体；A sealed standard gas module, configured to set a measurement disk on the measurement optical path, set three measurement windows on the measurement disk, and seal a carbon dioxide standard gas of a known concentration in one of the measurement windows;设置测量通道模块，用于通过所述三个测量窗口将单通道光路分为三个测量通道，所述测量通道包括待测气体光路、待测气体+二氧化碳标准气体光路和参考光路；Setting a measurement channel module for dividing a single-channel optical path into three measurement channels through the three measurement windows, the measurement channel including a gas path to be measured, a gas path to be measured + a carbon dioxide standard gas path, and a reference optical path;处理模块，用于输入已知浓度的二氧化碳气体，设置预定数量的校准点，根据二氧化碳浓度和透光强度之间的关系，建立二氧化碳浓度值表格；A processing module for inputting carbon dioxide gas of a known concentration, setting a predetermined number of calibration points, and establishing a table of carbon dioxide concentration values according to the relationship between the carbon dioxide concentration and the light transmission intensity;查询模块，用于查询二氧化碳浓度值表格，并通过计算获取医用二 氧化碳浓度的实时测量值。The query module is used to query the CO2 concentration value table and obtain the real-time measurement value of the medical CO2 concentration through calculation.
- 如权利要求6所述的装置，其特征在于，所述测量窗口包括设置在所述测量盘上通孔和设置在所述通孔两端的透明盖。The device according to claim 6, wherein the measurement window comprises a through hole provided on the measurement disc and transparent covers provided at both ends of the through hole.
- 如权利要求7所述的装置，其特征在于，所述待测气体光路通过的测量窗口的两端设有中心波长为4.26微米滤光片，所述待测气体+标准二氧化碳气体光路通过的测量窗口的两端设有中心波长为4.26微米的滤光片，所述标准二氧化碳气体密封在所述待测气体+标准二氧化碳气体光路的测量窗口中，所述参考光路通过的测量窗口的两端设有中心波长为3.7微米的滤光片。The device according to claim 7, characterized in that a filter having a center wavelength of 4.26 microns is provided at both ends of the measurement window through which the optical path of the gas to be measured passes, and the optical path of the gas to be measured + standard carbon dioxide gas is measured. A filter with a center wavelength of 4.26 microns is provided at both ends of the window, and the standard carbon dioxide gas is sealed in the measurement window of the gas to be measured + standard carbon dioxide gas optical path. The two ends of the measurement window through which the reference optical path passes are provided. There is a filter with a center wavelength of 3.7 microns.
- 如权利要求6所述的装置，其特征在于，所述二氧化碳浓度和透光强度之间的关系，具体通过以下公式确定：The device according to claim 6, wherein the relationship between the carbon dioxide concentration and the light transmission intensity is specifically determined by the following formula:
将已知浓度的标准二氧化碳气体C代入公式(1)得：Substituting standard carbon dioxide gas C of known concentration into formula (1) gives:
其中，tCO 2表示所述待测气体光路中二氧化碳气体浓度值，rCO 2表示所述参考光路中的二氧化碳气体浓度值，(t+s)CO 2表示所述待测气体+标准二氧化碳气体光路中待测气体+标准二氧化碳气体的气体浓度；cCO 2表示已知浓度的标准二氧化碳气体的浓度，I t表示待测气体光路的透射光强，I r表示参考光路的透射光强，I c+s是待测气体+标准二氧化碳气体的透射光强。 Wherein, tCO 2 represents the concentration of carbon dioxide gas in the optical path of the gas to be measured, rCO 2 represents the concentration of carbon dioxide gas in the reference optical path, and (t + s) CO 2 represents the optical path of the gas to be measured + standard carbon dioxide gas. Gas concentration of the test gas + standard carbon dioxide gas; cCO 2 represents the concentration of the standard carbon dioxide gas of known concentration, I t represents the transmitted light intensity of the optical path of the gas to be measured, I r represents the transmitted light intensity of the reference optical path, and I c + s It is the transmitted light intensity of the test gas + standard carbon dioxide gas. - 如权利要求6所述的装置，其特征在于，所述处理模块包括：The apparatus according to claim 6, wherein the processing module comprises:校准点设置单元，用于设置多个校准点，所述校准点包括0值、最大值和有限个校准点；A calibration point setting unit, configured to set a plurality of calibration points, where the calibration points include a zero value, a maximum value, and a limited number of calibration points;处理单元，用于输入已知浓度的二氧化碳气体获得从0～MaxCO 2区 间中的的列表，其中k取1、2、3、……、MaxN，校准点之间的数据通过二次曲线差值的方法获取； Processing means for inputting a known concentration of carbon dioxide gas is obtained from the interval 0 ~ MaxCO 2 of
, Where k is 1, 2, 3, ..., MaxN, and the data between the calibration points is obtained by the method of the difference of the quadratic curve;表格生成单元，用于建立用于计算和查找最终二氧化碳值的表格。A table generation unit is used to create a table for calculating and finding the final carbon dioxide value.
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