Oxygen concentration testing method, oxygen concentration testing device and fluorescent oxygen sensor

Abstract

The present invention discloses an oxygen concentration testing method, an oxygen concentration testing device and a fluorescent oxygen sensor, wherein the oxygen concentration testing method comprises the following steps: obtaining a current phase shift value measured by a fluorescent oxygen sensor in a current oxygen concentration environment; obtaining a multi-site oxygen concentration calculation formula with known parameters; and calculating the current oxygen concentration in the current oxygen concentration environment according to the current phase shift value and the multi-site oxygen concentration calculation formula with known parameters. The oxygen concentration testing method of the embodiment of the present invention can greatly improve the accuracy of oxygen concentration testing.

Description

Technical Field

[0001] The present invention relates to the technical field of oxygen concentration detection, and in particular to an oxygen concentration testing method, an oxygen concentration testing device and a fluorescent oxygen sensor. Background Art

[0002] For fluorescent oxygen sensors, the oxygen concentration calculation formula generally uses the Stern-Volmer equation to obtain the quenching constant through linear fitting, and then the oxygen concentration calculation formula of the sensor can be obtained. The oxygen concentration in the current oxygen concentration environment can be calculated through this oxygen concentration calculation formula.

[0003] However, for many fluorescent oxygen sensors, the quenching phenomenon occurs in a non-uniform medium, and the Stern-Volmer linear equation established based on the physical chemistry of homogeneous solutions is not necessarily appropriate. For example, for solid supported film sensors, for situations that deviate from the Stern-Volmer equation, such as nonlinear dissolution models and multi-site models, they are non-linear equations. Summary of the invention

[0004] The present invention aims to solve one of the technical problems in the above-mentioned technology at least to some extent.

[0005] Therefore, an object of the present invention is to provide an oxygen concentration testing method, which can significantly improve the accuracy of oxygen concentration testing.

[0006] The second objective of the present invention is to provide an oxygen concentration testing device.

[0007] The third object of the present invention is to provide a fluorescence oxygen sensor.

[0008] To achieve the above-mentioned purpose, the first aspect of the embodiment of the present invention proposes an oxygen concentration testing method, comprising the following steps: obtaining a current phase shift value measured by a fluorescent oxygen sensor in a current oxygen concentration environment; obtaining a multi-site oxygen concentration calculation formula with known parameters; and calculating the current oxygen concentration in the current oxygen concentration environment based on the current phase shift value and the multi-site oxygen concentration calculation formula with known parameters.

[0009] According to the oxygen concentration testing method of an embodiment of the present invention, first, the current phase shift value measured by the fluorescent oxygen sensor in the current oxygen concentration environment is obtained, then the multi-site oxygen concentration calculation formula with known parameters is obtained, and finally, the current oxygen concentration in the current oxygen concentration environment is calculated based on the current phase shift value and the multi-site oxygen concentration calculation formula with known parameters, thereby greatly improving the accuracy of the oxygen concentration test.

[0010] In addition, the oxygen concentration testing method proposed in the above embodiment of the present invention may also have the following additional technical features:

[0011] In one embodiment of the present invention, the multi-site oxygen concentration calculation formula with known parameters includes: obtaining a first phase shift value measured by the fluorescent oxygen sensor in a vacuum and a plurality of second phase shift values ​​measured in a plurality of different known oxygen concentration environments; fitting the multi-site oxygen concentration calculation formula with unknown parameters according to the first phase shift value, the plurality of second phase shift values ​​and the plurality of known oxygen concentrations to obtain the values ​​of the parameters in the multi-site oxygen concentration calculation formula; and obtaining the multi-site oxygen concentration calculation formula with known parameters according to the values ​​of the parameters.

[0012] In one embodiment of the present invention, the multi-site oxygen concentration calculation formula with unknown parameters is fitted according to the first phase shift value, the multiple second phase shift values ​​and the multiple known oxygen concentrations to obtain the values ​​of the parameters in the multi-site oxygen concentration calculation formula, including: cyclically taking values ​​of the parameters within the preset value range of the parameters to obtain multiple values ​​of the parameters; calculating multiple calculated oxygen concentration curves according to the values ​​of the multiple parameters, the first phase shift value, the multiple second phase shift values ​​and the multiple known oxygen concentrations; obtaining a true oxygen concentration curve according to the multiple second phase shift values ​​and the multiple known oxygen concentrations; taking the calculated oxygen concentration curve among the multiple calculated oxygen concentration curves that is closest to the true oxygen concentration curve as the target curve; and taking the value of the parameter corresponding to the target curve as the value of the parameter in the multi-site oxygen concentration calculation formula.

[0013] In one embodiment of the present invention, the method of taking the calculated oxygen concentration curve that is closest to the actual oxygen concentration curve among the multiple calculated oxygen concentration curves as the target curve includes: obtaining multiple difference curves based on the multiple calculated oxygen concentration curves and the actual oxygen concentration curve; calculating multiple proximity between the multiple calculated oxygen concentration curves and the actual oxygen concentration curve based on the multiple difference curves; and taking the calculated oxygen concentration curve with the smallest proximity as the target curve.

[0014] In one embodiment of the present invention, the calculating of the multiple proximities between the multiple calculated oxygen concentration curves and the true oxygen concentration curve according to the multiple difference curves includes: calculating the sum of the absolute values ​​of the differences according to the multiple difference curves to obtain the multiple proximities.

[0015] To achieve the above-mentioned purpose, the second aspect of the embodiment of the present invention proposes an oxygen concentration testing device, including: a first acquisition module, used to obtain the current phase shift value measured by the fluorescent oxygen sensor in the current oxygen concentration environment; a second acquisition module, used to obtain a multi-site oxygen concentration calculation formula with known parameters; a calculation module, used to calculate the current oxygen concentration in the current oxygen concentration environment based on the current phase shift value and the multi-site oxygen concentration calculation formula with known parameters.

[0016] The oxygen concentration testing device of the embodiment of the present invention first obtains the current phase shift value measured by the fluorescent oxygen sensor in the current oxygen concentration environment through the first acquisition module, obtains the multi-site oxygen concentration calculation formula with known parameters through the second acquisition module, and then calculates the current oxygen concentration in the current oxygen concentration environment according to the current phase shift value and the multi-site oxygen concentration calculation formula with known parameters through the calculation module, thereby greatly improving the accuracy of the oxygen concentration test.

[0017] In addition, the oxygen concentration testing device proposed in the above embodiment of the present invention may also have the following additional technical features:

[0018] In one embodiment of the present invention, the second acquisition module is specifically used to: obtain a first phase shift value measured by the fluorescent oxygen sensor in a vacuum and multiple second phase shift values ​​measured in multiple different known oxygen concentration environments; fit a multi-site oxygen concentration calculation formula with unknown parameters according to the first phase shift value, the multiple second phase shift values ​​and the multiple known oxygen concentrations to obtain the values ​​of the parameters in the multi-site oxygen concentration calculation formula; and obtain the multi-site oxygen concentration calculation formula with known parameters according to the values ​​of the parameters.

[0019] In one embodiment of the present invention, the calculation module is specifically used to: cyclically take values ​​of the parameters within a preset value range of the parameters to obtain multiple values ​​of the parameters; calculate multiple calculated oxygen concentration curves according to the multiple values ​​of the parameters, the first phase shift value, the multiple second phase shift values ​​and the multiple known oxygen concentrations; obtain a true oxygen concentration curve according to the multiple second phase shift values ​​and the multiple known oxygen concentrations; use the calculated oxygen concentration curve that is closest to the true oxygen concentration curve among the multiple calculated oxygen concentration curves as the target curve; and use the value of the parameter corresponding to the target curve as the value of the parameter in the multi-site oxygen concentration calculation formula.

[0020] In one embodiment of the present invention, the calculation module is specifically used to: obtain multiple difference curves based on the multiple calculated oxygen concentration curves and the true oxygen concentration curve; calculate multiple proximities between the multiple calculated oxygen concentration curves and the true oxygen concentration curve based on the multiple difference curves; and use the calculated oxygen concentration curve with the smallest proximity as the target curve.

[0021] In order to achieve the above-mentioned purpose, a fluorescent oxygen sensor provided in an embodiment of a third aspect of the present invention comprises: an oxygen concentration testing device according to an embodiment of the second aspect of the present invention.

[0022] The fluorescent oxygen sensor of the embodiment of the present invention can greatly improve the accuracy of oxygen concentration testing through the above oxygen concentration testing device.

[0023] Advantages of additional aspects of the present invention will be given in part in the following description, and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0025] Figure 1 is a flow chart of an oxygen concentration testing method according to one embodiment of the present invention;

[0026] Figure 2 It is a logical diagram of the principle of fluorescence quenching;

[0027] Figure 3 is a flow chart of an oxygen concentration testing method according to another embodiment of the present invention;

[0028] Figure 4 is a schematic diagram of calibration parameters in an oxygen concentration testing method according to a specific embodiment of the present invention;

[0029] Figure 5 is a schematic diagram of a difference curve according to a specific embodiment of the present invention;

[0030] Figure 6 is a schematic diagram of an oxygen concentration curve calculated according to a specific embodiment of the present invention;

[0031] Figure 7 is a schematic diagram of an optimal curve and an absolute curve according to a specific embodiment of the present invention; and

[0032] Figure 8 FIG. 4 is a block diagram of an oxygen concentration testing device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0033] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0034] The oxygen concentration testing method, oxygen concentration testing device and fluorescent oxygen sensor according to the embodiments of the present invention are described below with reference to the accompanying drawings.

[0035] Figure 1is a flow chart of an oxygen concentration test method according to an embodiment of the present invention. The oxygen concentration test method of the embodiment of the present invention can be applied to an oxygen sensor, for example, a fluorescent oxygen sensor (also known as a fluorescent quenching oxygen sensor). It should be noted that the oxygen sensor described in this embodiment can be installed in the exhaust pipe of a car to detect the oxygen concentration in the exhaust gas.

[0036] Among them, the general way for the fluorescent oxygen sensor to detect the current oxygen concentration in the current oxygen concentration environment is to use the Stern-Volmer equation to obtain the quenching constant through linear fitting, so as to obtain the oxygen concentration calculation formula of the sensor, and the oxygen concentration in the current oxygen concentration environment is calculated by the oxygen concentration calculation formula.

[0037] It should be noted that the fluorescence quenching principle of the fluorescent oxygen sensor in this embodiment is as follows: Figure 2 As shown, the fluorescent molecules in the ground state absorb light energy with the same characteristic frequency and transition to various energy levels of the excited state. Since the molecules excited to various vibrational energy levels of the excited state are unstable, they eventually fall to various vibrational energy levels of the ground state and scatter the response light quanta, which is called fluorescence. Eventually, the vibrational energy levels of the ground state molecules return to the lowest vibrational energy level of the ground state through non-radiative transitions. The fluorescence quenching of the fluorescent substance and oxygen will simultaneously lead to the shortening of the fluorescence lifetime and the weakening of the fluorescence intensity. Therefore, the concentration or content of oxygen can be evaluated by measuring the shortening of the fluorescence lifetime or the weakening of the fluorescence intensity.

[0038] For fluorescent oxygen sensors, the oxygen concentration is generally calculated using the Stern-Volmer equation. The quenching constant K is obtained by linear fitting, and the oxygen concentration calculation formula of the sensor can be obtained (1): Among them, I0, I, τ0, τ are the fluorescence intensity and lifetime under oxygen-free and oxygen-containing conditions, x(O2) is the concentration of oxygen, and K is the Stern-Volmer quenching constant, which is fixed for a specific quencher. For the measurement of fluorescence intensity and lifetime, the phase shift can be used to calculate, The phase shift method is used to measure the fluorescence lifetime. The excitation light used is a sinusoidally modulated light signal, so the fluorescence signal emitted by the fluorescent substance also changes sinusoidally. Due to the time delay between light absorption and emission, the fluorescence is delayed by a certain value in phase shift compared to the excitation light. Then a0 and a are the phase shifts under the conditions of no oxygen and oxygen respectively. Therefore, the oxygen concentration can be calculated by testing the phase shift a.

[0039] However, for many fluorescent oxygen sensors, the quenching phenomenon is completed in a non-uniform medium, so the Stern-Volmer linear equation established based on the physical chemistry of homogeneous solutions is not necessarily appropriate, such as solid supported film sensors. For equations that deviate from the Stern-Volmer equation, such as the multi-site equation (2): Among them, K sv1 and K sv2 are the quenching constants of the quenching process of freely dissolved molecules and aggregated molecules, respectively, and f1 and f2 are the relative distribution coefficients of freely dissolved molecules and aggregated molecules, respectively.

[0040] In order to solve the above-mentioned problem in the prior art regarding the oxygen concentration test of the fluorescent oxygen sensor, the embodiment of the present invention proposes an oxygen concentration test method, such as Figure 1 As shown, the oxygen concentration testing method of the embodiment of the present invention may include the following steps:

[0041] S1, obtaining the current phase shift value measured by the fluorescent oxygen sensor in the current oxygen concentration environment;

[0042] S2, obtaining a multi-site oxygen concentration calculation formula with known parameters;

[0043] S3, calculating the current oxygen concentration in the current oxygen concentration environment according to the current phase shift value and a multi-site oxygen concentration calculation formula with known parameters.

[0044] For example, assume that a fluorescent oxygen sensor using the oxygen concentration testing method of an embodiment of the present invention is installed in the exhaust pipe of a car. When the car is started, the current phase shift value measured in real time by the fluorescent oxygen sensor installed in the exhaust pipe is obtained, and the current oxygen concentration in the current oxygen concentration environment is calculated based on the current phase shift value and a multi-site oxygen concentration calculation formula with known parameters, that is, the oxygen concentration in the exhaust gas emitted by the car.

[0045] The following describes in detail how to obtain the multi-site oxygen concentration calculation formula with known parameters:

[0046] In one embodiment of the present invention, Figure 3 As shown, in the above oxygen concentration testing method, S2 may include the following steps:

[0047] S21, obtaining a first phase shift value measured by the fluorescent oxygen sensor in a vacuum and a plurality of second phase shift values ​​measured in a plurality of environments with different known oxygen concentrations;

[0048] S22, fitting a multi-site oxygen concentration calculation formula with unknown parameters according to the first phase shift value, multiple second phase shift values ​​and multiple known oxygen concentrations to obtain values ​​of parameters in the multi-site oxygen concentration calculation formula.

[0049] Wherein, step S22 may include: looping the parameters within the preset value range of the parameters to obtain the values ​​of multiple parameters, and calculating multiple calculated oxygen concentration curves according to the values ​​of the multiple parameters, the first phase shift value, the multiple second phase shift values ​​and the multiple known oxygen concentrations, and obtaining the real oxygen concentration curve according to the multiple second phase shift values ​​and the multiple known oxygen concentrations, and then taking the calculated oxygen concentration curve closest to the real oxygen concentration curve among the multiple calculated oxygen concentration curves as the target curve, and taking the value of the parameter corresponding to the target curve as the value of the parameter in the multi-site oxygen concentration calculation formula. Wherein, the preset value range can be calibrated according to actual conditions.

[0050] Further, taking the calculated oxygen concentration curve closest to the actual oxygen concentration curve among the multiple calculated oxygen concentration curves as the target curve may include: obtaining multiple difference curves according to the multiple calculated oxygen concentration curves and the actual oxygen concentration curve, and calculating multiple proximity between the multiple calculated oxygen concentration curves and the actual oxygen concentration curve according to the multiple difference curves, and taking the calculated oxygen concentration curve with the smallest proximity as the target curve. Further, calculating multiple proximity between the multiple calculated oxygen concentration curves and the actual oxygen concentration curve according to the multiple difference curves may include: calculating the sum of the absolute values ​​of the differences according to the multiple difference curves to obtain multiple proximity.

[0051] S23, obtaining a multi-site oxygen concentration calculation formula with known parameters according to the values ​​of the parameters.

[0052] It can be seen that by obtaining the current phase shift value in the current oxygen concentration environment and the multi-site oxygen concentration calculation formula with known parameters, the current oxygen concentration in the current oxygen concentration environment can be calculated, which can greatly improve the accuracy of the oxygen concentration test.

[0053] The following is combined with Figure 4-7 The oxygen concentration test method of the embodiment of the present invention is described in detail:

[0054] It is assumed that the fluorescent indicator in the fluorescent oxygen sensor to which the oxygen concentration testing method according to the embodiment of the present invention is applied is platinum octaethylporphyrin (PtOEP).

[0055] First, the corresponding phase shift is tested under different oxygen concentration conditions, where the phase shift value measured in vacuum is a0, and the phase shift measured in an aerobic environment is a (i.e., the current phase shift value measured by the fluorescent oxygen sensor in the current oxygen concentration environment). Assume that the quenching coefficient K of the free dissolved molecules in the multi-site model is sv1 is the quenching coefficient of aggregated molecules, K sv2 m times, then K sv1 =mK sv2 . The total molecular distribution coefficient is 1, then f2 = 1-f1.

[0056] The multi-site model can be:

[0057]

[0058] A*[O] 2 +B*[O]+C=0,

[0059] The oxygen concentration is calculated as:

[0060]

[0061] in,

[0062] The oxygen concentration of the calibrated test environment is known, that is, the three parameters K in the oxygen concentration calculation formula need to be fitted according to the actual test data. sv1 , f1 and m, the calculated relationship between oxygen concentration [O] and the measured phase shift a value can be obtained.

[0063] Among them, the idea of ​​the calibration parameter calculation method can be as follows Figure 4 The three parameters K in formula (3) are sv1 , f1 and m, give different values ​​of the three parameters, calculate the oxygen concentration of different phase shifts under all combinations of the three parameters, get the calculated oxygen concentration curve, and then compare it with the real oxygen concentration curve of the environment. When the calculated oxygen concentration curve is closest to the real oxygen concentration curve, the three parameters K corresponding to the calculated oxygen concentration curve (i.e., the target curve) are sv1 , the values ​​of f1 and m can be the optimal parameter values ​​for fitting calibration.

[0064] The calculation method is described in detail below:

[0065] The quenching coefficient K of a generally freely dissolved molecule sv1 is the quenching coefficient of aggregated molecules, K sv2 28 times of , then m can be between 25 and 35, and the interval of the cyclic calculation value can be 0.01.

[0066] f1 is the relative distribution coefficient of freely dissolved molecules, which ranges from 0 to 1, and the interval of the cyclic calculation can be 0.001.

[0067] According to the Stern-Volmer linear equation, the quenching constant K sv It is approximately between 0.04 and 0.07, and the interval of the cyclic calculation value can be 0.001.

[0068] Phase shift a is between 0-100% oxygen concentration, and one is tested every 5%, that is, a0~a 21 , where a0 is the phase shift in the absence of oxygen.

[0069] The calculated oxygen concentration curve is subtracted from the actual oxygen concentration curve to obtain the difference curve, such as Figure 5 shown.

[0070] Take the absolute value of each difference and sum them to get the closeness s of the curve. Find the smallest s in the cycle calculation, that is, the calculated oxygen concentration curve closest to the absolute curve (that is, the target curve), and the K corresponding to this curve sv1 ,f1,m combination value is the best value of the three fitting parameters. Figure 6 As shown, when s is the smallest, K sv1 =0.055, f1=0.807, m=29.36. Substituting the three parameters into formula (3), we get the calibration calculation formula. The calculated optimal curve (i.e., target curve) and absolute curve can be as follows: Figure 7 shown.

[0071] In summary, according to the oxygen concentration testing method of an embodiment of the present invention, the current phase shift value measured by the fluorescent oxygen sensor in the current oxygen concentration environment is first obtained, and then the current oxygen concentration in the current oxygen concentration environment is calculated based on the current phase shift value and a multi-site oxygen concentration calculation formula with known parameters, thereby greatly improving the accuracy of the oxygen concentration test.

[0072] Figure 8 FIG. 4 is a block diagram of an oxygen concentration testing device according to an embodiment of the present invention.

[0073] like Figure 8 As shown, the oxygen concentration testing device according to the embodiment of the present invention may include: a first acquisition module 100 , a second acquisition module 200 and a calculation module 300 .

[0074] The first acquisition module 100 is used to acquire the current phase shift value measured by the fluorescent oxygen sensor in the current oxygen concentration environment.

[0075] The second acquisition module 200 is used to obtain a multi-point oxygen concentration calculation formula with known parameters.

[0076] The calculation module 300 is used to calculate the current oxygen concentration in the current oxygen concentration environment according to the current phase shift value and the multi-point oxygen concentration calculation formula with known parameters.

[0077] In one embodiment of the present invention, the second acquisition module 200 is specifically used to obtain a first phase shift value measured by the fluorescent oxygen sensor in a vacuum and multiple second phase shift values ​​measured in multiple different known oxygen concentration environments, and to fit a multi-site oxygen concentration calculation formula with unknown parameters based on the first phase shift value, the multiple second phase shift values ​​and the multiple known oxygen concentrations to obtain the values ​​of the parameters in the multi-site oxygen concentration calculation formula, and to obtain the multi-site oxygen concentration calculation formula with known parameters based on the values ​​of the parameters.

[0078] In one embodiment of the present invention, the calculation module 200 is specifically used to: cyclically take values ​​of the parameters within a preset value range of the parameters to obtain values ​​of multiple parameters; and calculate multiple calculated oxygen concentration curves based on the values ​​of the multiple parameters, the first phase shift value, multiple second phase shift values ​​and multiple known oxygen concentrations; and obtain a true oxygen concentration curve based on the multiple second phase shift values ​​and multiple known oxygen concentrations; and use the calculated oxygen concentration curve that is closest to the true oxygen concentration curve among the multiple calculated oxygen concentration curves as the target curve, and use the value of the parameter corresponding to the target curve as the value of the parameter in the multi-site oxygen concentration calculation formula.

[0079] In one embodiment of the present invention, the calculation module 200 is also specifically used to: obtain multiple difference curves based on multiple calculated oxygen concentration curves and real oxygen concentration curves, and calculate multiple proximity of the multiple calculated oxygen concentration curves to the real oxygen concentration curve based on the multiple difference curves, and use the calculated oxygen concentration curve with the smallest proximity as the target curve.

[0080] It should be noted that for details not disclosed in the oxygen concentration testing method of the embodiment of the present invention, please refer to the details disclosed in the oxygen concentration testing device of the embodiment of the present invention, and the details will not be repeated here.

[0081] In summary, the oxygen concentration testing device of the embodiment of the present invention first obtains the current phase shift value measured by the fluorescent oxygen sensor in the current oxygen concentration environment through the acquisition module, and then calculates the current oxygen concentration in the current oxygen concentration environment according to the current phase shift value and the multi-site oxygen concentration calculation formula with known parameters through the calculation module, thereby greatly improving the accuracy of the oxygen concentration test.

[0082] In order to implement the above embodiment, the present invention further provides a fluorescent oxygen sensor, which includes the above oxygen concentration testing device.

[0083] The fluorescent oxygen sensor of the embodiment of the present invention can greatly improve the accuracy of oxygen concentration testing through the above oxygen concentration testing device.

[0084] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0085] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0086] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0087] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0088] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0089] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A method for testing oxygen concentration, characterized in that: The following steps are involved: Obtain the current phase shift value measured by the fluorescent oxygen sensor in the current oxygen concentration environment; Acquire a first phase shift value measured by the fluorescent oxygen sensor in a vacuum and a plurality of second phase shift values ​​measured in a plurality of different known oxygen concentration environments, cyclically acquire values ​​of the parameter within a preset value range of the parameter to obtain a plurality of values ​​of the parameter, calculate a plurality of calculated oxygen concentration curves according to the values ​​of the plurality of parameters, the first phase shift value, the plurality of second phase shift values ​​and the plurality of known oxygen concentrations, determine a true oxygen concentration curve according to the plurality of second phase shift values ​​and the plurality of known oxygen concentrations, take the calculated oxygen concentration curve among the plurality of calculated oxygen concentration curves that is closest to the true oxygen concentration curve as a target curve, take the value of the parameter corresponding to the target curve as the value of the parameter in a multi-site oxygen concentration calculation formula, and determine a multi-site oxygen concentration calculation formula with known parameters according to the value of the parameter; The current oxygen concentration in the current oxygen concentration environment is calculated according to the current phase shift value and the multi-site oxygen concentration calculation formula with known parameters.

2. The oxygen concentration testing method according to claim 1, characterized in that: The calculated oxygen concentration curve closest to the actual oxygen concentration curve among the multiple calculated oxygen concentration curves is used as the target curve, comprising: Obtaining a plurality of difference curves according to the plurality of calculated oxygen concentration curves and the actual oxygen concentration curve; Calculating, according to the plurality of difference curves, a plurality of proximity between the plurality of calculated oxygen concentration curves and the true oxygen concentration curve; The calculated oxygen concentration curve with the smallest approximation is used as the target curve.

3. The oxygen concentration testing method according to claim 2, characterized in that: The step of calculating, according to the plurality of difference curves, a plurality of proximity between the plurality of calculated oxygen concentration curves and the true oxygen concentration curve comprises: The sum of the absolute values ​​of the differences is calculated according to the plurality of difference curves to obtain the plurality of proximity.

4. An oxygen concentration testing device, characterized in that: include: A first acquisition module is used to acquire a current phase shift value measured by the fluorescent oxygen sensor in a current oxygen concentration environment; a second acquisition module, for acquiring a first phase shift value measured by the fluorescent oxygen sensor in a vacuum and a plurality of second phase shift values ​​measured in a plurality of different known oxygen concentration environments, cyclically acquiring values ​​of the parameters within a preset value range of the parameters to obtain a plurality of values ​​of the parameters, calculating a plurality of calculated oxygen concentration curves according to the values ​​of the plurality of parameters, the first phase shift value, the plurality of second phase shift values ​​and the plurality of known oxygen concentrations, determining a true oxygen concentration curve according to the plurality of second phase shift values ​​and the plurality of known oxygen concentrations, taking a calculated oxygen concentration curve among the plurality of calculated oxygen concentration curves that is closest to the true oxygen concentration curve as a target curve, taking the value of the parameter corresponding to the target curve as the value of the parameter in the multi-site oxygen concentration calculation formula, and determining according to the value of the parameter; The calculation module is used to calculate the current oxygen concentration in the current oxygen concentration environment according to the current phase shift value and the multi-site oxygen concentration calculation formula with known parameters.

5. The oxygen concentration testing device according to claim 4, characterized in that: The calculation module is specifically used for: Obtaining a plurality of difference curves according to the plurality of calculated oxygen concentration curves and the actual oxygen concentration curve; Calculating, according to the plurality of difference curves, a plurality of proximity between the plurality of calculated oxygen concentration curves and the true oxygen concentration curve; The calculated oxygen concentration curve with the smallest approximation is used as the target curve.

6. A fluorescent oxygen sensor, characterized in that: include: An oxygen concentration testing device as claimed in claim 4 or 5.

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