CN116297824A - Ultrasonic-based oxygen concentration measurement method and ultrasonic dissolved oxygen meter - Google Patents
Ultrasonic-based oxygen concentration measurement method and ultrasonic dissolved oxygen meter Download PDFInfo
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 142
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 142
- 239000001301 oxygen Substances 0.000 title claims abstract description 142
- 238000000691 measurement method Methods 0.000 title claims description 20
- 239000007788 liquid Substances 0.000 claims abstract description 137
- 230000005540 biological transmission Effects 0.000 claims abstract description 53
- 238000005259 measurement Methods 0.000 claims abstract description 41
- 238000000034 method Methods 0.000 claims abstract description 35
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- 238000013178 mathematical model Methods 0.000 claims description 15
- 238000001514 detection method Methods 0.000 claims description 10
- 238000005070 sampling Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
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- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
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- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- G01N2291/0228—Aqueous liquids
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
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- G01N2291/02809—Concentration of a compound, e.g. measured by a surface mass change
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Abstract
The application discloses an oxygen concentration measuring method and an ultrasonic dissolved oxygen meter based on ultrasonic waves, which are characterized in that firstly, a density value of liquid to be measured is obtained according to physical transmission characteristic parameters of ultrasonic signals with preset frequency in the liquid to be measured; acquiring a temperature compensation value corresponding to the density value of the liquid to be detected according to the temperature value of the liquid; then acquiring the transmission time required by the ultrasonic signal with the frequency of a first frequency value when the ultrasonic signal is transmitted for a fixed distance in the liquid to be detected, and acquiring the oxygen concentration nominal value of the liquid to be detected; and finally, obtaining an oxygen concentration measurement value according to the oxygen concentration nominal value and the temperature compensation value. The concentration value of the liquid to be measured is obtained through the ultrasonic signal, and then the measured oxygen concentration value is compensated according to the temperature compensation value corresponding to the concentration value of the liquid to be measured, so that the measurement accuracy of the ultrasonic dissolved oxygen meter is greatly improved.
Description
Technical Field
The invention relates to the technical field of liquid component detection, in particular to an oxygen concentration measuring method based on ultrasonic waves and an ultrasonic dissolved oxygen meter.
Background
The molecular dissolution of Oxygen in a body of water is called Dissolved Oxygen (DO). The DO is inversely related to the water pollution degree and is a main parameter for water quality evaluation. Has important significance for water body environment protection and aquaculture. The existing method for detecting the concentration of the dissolved oxygen mainly comprises two main types, namely a chemical measuring method and an instrumental measuring method, wherein the chemical measuring method is a method for obtaining the concentration of the dissolved oxygen according to the consumption of a reducing substance through chemical reaction between the dissolved oxygen and the reducing substance. Instrumental measurements are the determination of a physical or electrical signal of a liquid. In practical application, the chemical method has complicated detection process, and the instrument measurement method is portable, convenient, easy to use and high in cost performance, so that the instrument measurement method is widely used. Therefore, how to improve the accuracy of the instrument measurement method is the main research direction of the manufacturers of the oxygen dissolving instrument at the present stage.
Disclosure of Invention
The invention mainly solves the technical problem of how to improve the measurement accuracy of the dissolved oxygen meter.
According to a first aspect, in one embodiment there is provided an ultrasound-based oxygen concentration measurement method comprising:
acquiring physical transmission characteristic parameters of at least one ultrasonic signal with preset frequency in liquid to be detected and a temperature value of the liquid to be detected;
acquiring a density value of the liquid to be detected according to the value of each preset frequency and the physical transmission characteristic parameter;
inputting the density value and the temperature value of the liquid to be measured into a preset temperature compensation mathematical model to obtain a temperature compensation value corresponding to the density value of the liquid to be measured, which is output by the temperature compensation mathematical model;
acquiring the transmission time required by transmitting an ultrasonic signal with a first frequency value in a liquid to be measured for a fixed distance;
acquiring an oxygen concentration nominal value of the liquid to be detected according to the transmission time;
and obtaining the oxygen concentration measured value according to the oxygen concentration nominal value and the temperature compensation value, and outputting the oxygen concentration measured value.
In an embodiment, the acquiring physical transmission characteristic parameters of the at least one ultrasonic signal with a preset frequency in the liquid to be measured includes:
acquiring the transmission speed of the ultrasonic signal of each preset frequency in the liquid to be detected;
and acquiring the density of the liquid to be detected according to the corresponding relation between the transmission speed and the liquid density when the ultrasonic signals with each preset frequency are transmitted in the liquid.
In one embodiment, the temperature compensation mathematical model acquisition method includes:
establishing a corresponding relation between the liquid temperature, a time difference and an oxygen concentration compensation value under different liquid densities in a calibrated mode, wherein the time difference is used for representing the transmission time required by the ultrasonic signal with a first frequency value when the ultrasonic signal is transmitted for a fixed distance in the liquid;
the corresponding relation between the established liquid temperature, time difference and the oxygen concentration compensation value is represented by a fitting equation, wherein the fitting equation is as follows:
Co=f(To，Δt)；
where Co represents an oxygen concentration compensation value, to represents a liquid temperature, and Δt represents a time difference.
In one embodiment, at least one density value interval is set in a preset density range interval, and the liquid to be measured with the density value in the same density value interval corresponds to one fitting equation.
In one embodiment, the fit equation is obtained using piecewise linear fit methods and/or least squares polynomial fit methods.
In one embodiment, the oxygen concentration measurement method further includes:
acquiring a measurement environment factor parameter for measuring the liquid to be measured; the measured environmental factor parameters include atmospheric pressure, liquid PH, liquid measurement depth, liquid suspended matter concentration, and/or atmospheric oxygen concentration;
acquiring an oxygen environment compensation value corresponding to each measured environment factor parameter;
and compensating the oxygen concentration measured value according to the oxygen environment compensation value and outputting the compensated oxygen concentration measured value.
In an embodiment, the method for obtaining the correspondence between the measured environmental factor parameter and the oxygen environment compensation value includes:
acquiring a relation curve of each measured environmental factor parameter and the corresponding oxygen environment compensation value by a sampling measurement mode;
performing equation fitting on the acquired relation curve of the measured environmental factor parameter and the oxygen environment compensation value corresponding to the measured environmental factor parameter to acquire an environmental parameter fitting equation; the environmental parameter fitting equation is used for representing the corresponding relation between the measured environmental factor parameter and the oxygen environment compensation value.
According to a second aspect, an embodiment provides a computer readable storage medium having stored thereon a program executable by a processor to implement the oxygen concentration measurement method according to the first aspect.
According to a third aspect, there is provided in one embodiment an ultrasonic oximeter for applying the oxygen concentration measurement method of the second aspect, comprising:
the detection unit is used for acquiring physical transmission characteristic parameters of at least one ultrasonic signal with preset frequency in the liquid to be detected and a temperature value of the liquid to be detected;
a density obtaining unit, configured to obtain a density value of the liquid to be measured according to each value of the preset frequency and the physical transmission characteristic parameter;
the temperature compensation unit is used for inputting the density value and the temperature value of the liquid to be detected into a preset temperature compensation mathematical model so as to obtain a temperature compensation value which is output by the temperature compensation mathematical model and corresponds to the density value of the liquid to be detected;
the concentration detection unit is used for obtaining the transmission time required by the transmission of the ultrasonic signal with the frequency of a first frequency value in the liquid to be detected for a fixed distance, and obtaining the nominal value of the oxygen concentration of the liquid to be detected according to the transmission time;
and the output display unit is used for acquiring the oxygen concentration measured value according to the oxygen concentration nominal value and the temperature compensation value and outputting the oxygen concentration measured value.
In one embodiment, the ultrasonic oximeter further comprises:
the environment parameter compensation unit is used for obtaining the measured environment factor parameters of each liquid to be measured through measurement, and obtaining an oxygen environment compensation value according to the corresponding relation between each measured environment factor parameter and the corresponding oxygen environment compensation value so as to compensate the oxygen concentration measurement value through the oxygen environment compensation value; wherein the measured environmental factor parameter comprises atmospheric pressure, liquid pH, liquid measurement depth, liquid suspension concentration and/or atmospheric oxygen concentration
According to the oxygen concentration measuring method of the embodiment, the concentration value of the liquid to be measured is obtained through the ultrasonic signal, and then the measured oxygen concentration value is compensated according to the temperature compensation value corresponding to the concentration value of the liquid to be measured, so that the measuring precision of the ultrasonic dissolved oxygen meter is greatly improved.
Drawings
FIG. 1 is a schematic flow chart of an oxygen concentration measurement method according to an embodiment;
FIG. 2 is a schematic circuit diagram of a monitoring device of an ultrasonic oximeter in an embodiment;
FIG. 3 is a block diagram of circuitry in one embodiment;
FIG. 4 is a schematic diagram of an ultrasonic oximeter in an embodiment.
Detailed Description
The invention will be described in further detail below with reference to the drawings by means of specific embodiments. Wherein like elements in different embodiments are numbered alike in association. In the following embodiments, numerous specific details are set forth in order to provide a better understanding of the present application. However, one skilled in the art will readily recognize that some of the features may be omitted, or replaced by other elements, materials, or methods in different situations. In some instances, some operations associated with the present application have not been shown or described in the specification to avoid obscuring the core portions of the present application, and may not be necessary for a person skilled in the art to describe in detail the relevant operations based on the description herein and the general knowledge of one skilled in the art.
Furthermore, the described features, operations, or characteristics of the description may be combined in any suitable manner in various embodiments. Also, various steps or acts in the method descriptions may be interchanged or modified in a manner apparent to those of ordinary skill in the art. Thus, the various orders in the description and drawings are for clarity of description of only certain embodiments, and are not meant to be required orders unless otherwise indicated.
The numbering of the components itself, e.g. "first", "second", etc., is used herein merely to distinguish between the described objects and does not have any sequential or technical meaning. The terms "coupled" and "connected," as used herein, are intended to encompass both direct and indirect coupling (coupling), unless otherwise indicated.
When measuring the concentration of oxygen in the liquid based on ultrasonic waves, corresponding compensation is performed according to the transmission characteristics of sound waves in the liquid and environmental factors, because the temperature of the liquid, the frequency of the ultrasonic waves and other liquid environmental factors (such as the motion state of the liquid, the hydraulic pressure, the content of the mixture and the like) can have influence on the compensation value. In the embodiment of the application, firstly, the density of the liquid to be measured is obtained based on ultrasonic waves, and then the corresponding compensation value is selected according to the density value, so that the measurement accuracy of the ultrasonic dissolved oxygen meter is improved.
Embodiment one:
referring to fig. 1, a flow chart of an oxygen concentration measurement method according to an embodiment is shown, where the oxygen concentration measurement method includes:
And acquiring physical transmission characteristic parameters of at least one ultrasonic signal with preset frequency in the liquid to be detected and a temperature value of the liquid to be detected. In an embodiment, physical transmission characteristic parameters of ultrasonic signals in a liquid to be measured and temperature values of the liquid to be measured can be obtained through an ultrasonic transducer and a temperature sensor, please refer to fig. 2, which is a schematic circuit diagram of a monitoring device of an ultrasonic oximeter in an embodiment, wherein the monitoring device of the ultrasonic oximeter comprises an ultrasonic transducer 102, an ultrasonic transducer 103, a temperature sensor 104 and a circuit system 101. The ultrasonic transducer 102 and the ultrasonic transducer 103 are fixedly connected to a waterproof colloid formed by the circuit system pouring sealant 105 through the filling glue 105, and the ultrasonic transducer 102, the ultrasonic transducer 103 and the temperature sensor 104 are electrically connected with the circuit system 101.
The circuit system 101 mainly provides an excitation signal for a first ultrasonic transducer, acquires an ultrasonic signal for receiving the ultrasonic transducer, acquires the time of ultrasonic transmission in water with different oxygen concentrations at a fixed distance by adopting an ultrasonic time measurement principle, and then calculates the concentration of oxygen in water through a time difference. The ultrasonic transducer 102 is configured to transmit ultrasonic waves, and the ultrasonic transducer 103 receives ultrasonic waves. In an embodiment, the frequency of the ultrasonic signal with the preset frequency is preferably 220kHz, which has better anti-interference and transmission capability. The temperature sensor 104 is used to identify the temperature of the liquid to be measured. The filling glue 105 is used for fixing the ultrasonic transducer, and can improve the vibration starting efficiency of the ultrasonic transducer. Potting adhesive 106 is used for fixation and waterproofing of circuitry 101.
And obtaining the density value of the liquid to be detected according to the value of each preset frequency and the physical transmission characteristic parameter. In an embodiment, a transmission speed of each ultrasonic signal with a preset frequency in the liquid to be measured is obtained, and then the density of the liquid to be measured is obtained according to the corresponding relation between the transmission speed and the density of the liquid when the ultrasonic signal with the preset frequency is transmitted in the liquid. The ultrasonic measurement of the concentration of a liquid specifically comprises:
1) The distance that the ultrasonic wave propagates in the time t is s, and the sound velocity is v=s/t;
2) The distance the ultrasonic wave propagates in time T (period) is λ (wavelength), then v=λ/t=λf;
3) Transverse wave velocity v= (Z/ρ) 1/2 Wherein Z is the restoring force of the deformation of the medium, and ρ is the liquid density.
The measurement of the liquid density can be performed by adopting a resonance interferometry method or a phase comparison method based on the three points.
In one embodiment, physical transmission characteristic parameters of at least two ultrasonic signals with preset frequencies in the liquid to be measured are obtained, and then a density value of the liquid to be measured is obtained according to the value of each preset frequency and the physical transmission characteristic parameters.
And inputting the density value and the temperature value of the liquid to be measured into a preset temperature compensation mathematical model to obtain a temperature compensation value corresponding to the density value of the liquid to be measured, which is output by the temperature compensation mathematical model.
Referring to fig. 3, in an embodiment, the circuit system 101 includes a main control module 201, an ultrasonic signal transmitting circuit 202, an ultrasonic signal receiving circuit 205, a comparing circuit 206, a time measuring module 207, and a power circuit 208. The main control module 201 specifically generates a plurality of pulse signals with the same frequency as the resonant frequency of the ultrasonic transducer and sends the pulse signals to the ultrasonic transmitting circuit 202, and stops transmitting the signals after the pulse signals are sent, and ensures that a line connected with the ultrasonic transmitting circuit is pulled down to the ground. The main control module 201 obtains the time result of the time measurement module 207, calculates the oxygen content in the water according to the fitting relation between the time value and the oxygen concentration by using the time value, and considers the influence of the temperature on the ultrasonic wave propagation speed. And establishing a relation between the temperature, the time difference and the oxygen concentration in water according to the measured value, establishing the relation between the temperature, the time difference and the oxygen concentration by a calibration method, and obtaining the relation by a data fitting mode.
In an embodiment, the main control module 201 is electrically connected to the temperature sensor 209, and obtains a temperature value of the liquid to be measured, and corrects the oxygen concentration value according to a curve of the transmission speed of the ultrasonic signal in the liquid affected by the temperature. The ultrasonic signal transmitting circuit 202 processes the pulse signal from the main control module 201 into a signal meeting the driving capability requirement of the sensor through the driving matching circuit, and the driving capability mainly refers to the voltage amplitude of the pulse signal. Wherein the sensor is referred to as an ultrasonic transducer 203. The ultrasonic transducer 204 is configured to receive an ultrasonic signal and send the ultrasonic signal to the ultrasonic signal receiving circuit 205, where the ultrasonic signal receiving circuit 205 captures and processes the transmitted ultrasonic signal into a clear and interference-free pulse signal mainly through an amplifying circuit and a filtering circuit, and specifically includes amplifying processing and filtering processing, so as to obtain a high-quality signal without clutter interference. The comparator 206 converts the received ultrasonic signal into a square wave signal through threshold comparison, so that it can be directly input into the time measurement module 207. The time measurement module 207 may implement high accuracy time measurement using a time-to-digital converter (Time to Digital Converter, TDC) method, with accuracy on the order of picoseconds, optionally including but not limited to a dedicated TDC chip. The time measurement module 207 receives the start signal from the main control module 201, captures the ultrasonic return signal from the comparator 206, extracts the time difference of the two signals according to the start signal and the return signal, and feeds the result into the main control module 201. The power module 208 provides a stable power supply to the circuit.
In one embodiment, the method for obtaining the temperature compensation mathematical model includes:
and establishing a corresponding relation between the liquid temperature, the time difference and the oxygen concentration compensation value under different liquid densities in a calibrated mode, wherein the time difference is used for representing the transmission time required by the ultrasonic signal with the first frequency value when the ultrasonic signal is transmitted for a fixed distance in the liquid.
The corresponding relation between the established liquid temperature, time difference and the oxygen concentration compensation value is represented by a fitting equation, wherein the fitting equation is as follows:
Co=f(To，Δt)；
where Co represents an oxygen concentration compensation value, to represents a liquid temperature, and Δt represents a time difference.
In one embodiment, the fit equation is obtained using piecewise linear fit methods and/or least squares polynomial fit methods.
In one embodiment, at least one density value interval is set in a preset density range interval, and the liquid to be measured with the density value in the same density value interval corresponds to a fitting equation.
And acquiring the transmission time required by the ultrasonic signal with the frequency of a first frequency value when the ultrasonic signal is transmitted for a fixed distance in the liquid to be measured, and acquiring the oxygen concentration nominal value of the liquid to be measured according to the transmission time. The transmission speed of the ultrasonic signal with the preset first frequency value in the liquid is in corresponding relation with the oxygen concentration of the liquid to be detected, and when the transmission speed of the ultrasonic signal in the liquid is obtained through measurement, the oxygen concentration of the liquid to be detected corresponding to the transmission speed can be obtained. In the embodiment of the present application, the transmission speed of the ultrasonic wave is represented by the transmission time required for the ultrasonic wave to transmit a fixed distance. In one embodiment, the first frequency value is preferably 220kHz.
And obtaining an oxygen concentration measurement value according to the oxygen concentration nominal value and the temperature compensation value, and outputting the oxygen concentration measurement value. In one embodiment, the nominal oxygen concentration value and the temperature compensation value are summed to form an oxygen concentration measurement.
In one embodiment, the oxygen concentration measurement method disclosed in the present application further includes:
Firstly, obtaining measurement environment factor parameters for measuring liquid to be measured, wherein the measurement environment factor parameters comprise atmospheric pressure, liquid PH value, liquid measurement depth, liquid suspended matter concentration and/or atmospheric oxygen concentration.
And then obtaining oxygen environment compensation values corresponding to each measured environment factor parameter.
And then compensating the oxygen concentration measured value according to the oxygen environment compensation value and outputting the oxygen concentration measured value.
In one embodiment, the method for obtaining the correspondence between the measured environmental factor parameter and the oxygen environment compensation value includes:
firstly, obtaining a relation curve of each measured environmental factor parameter and the corresponding oxygen environment compensation value by a sampling measurement mode, and then carrying out equation fitting on the obtained relation curve of the measured environmental factor parameter and the corresponding oxygen environment compensation value to obtain an environmental parameter fitting equation. The environment parameter fitting equation is used for representing the corresponding relation between the measured environment factor parameter and the oxygen environment compensation value. In one embodiment, the temperature compensation value is obtained to obtain the measured environmental factor parameter.
Referring to fig. 4, which is a schematic structural diagram of an ultrasonic dissolved oxygen meter in an embodiment, an ultrasonic dissolved oxygen meter for applying the oxygen concentration measurement method described above is further disclosed in an embodiment of the present application, and the ultrasonic dissolved oxygen meter includes a detection unit 10, a density acquisition unit 20, a temperature compensation unit 30, a concentration detection unit 40, and an output display unit 50. The detection unit 10 is configured to obtain a physical transmission characteristic parameter of at least one ultrasonic signal with a preset frequency in the liquid to be detected and a temperature value of the liquid to be detected. The density acquisition unit 20 is configured to acquire a density value of the liquid to be measured according to the value of each preset frequency and the physical transmission characteristic parameter. The temperature compensation unit 30 is configured to input the density value and the temperature value of the liquid to be measured into a preset temperature compensation mathematical model, so as to obtain a temperature compensation value corresponding to the density value of the liquid to be measured, which is output by the temperature compensation mathematical model. The concentration detection unit 40 is configured to obtain a transmission time required for transmitting an ultrasonic signal with a first frequency value in a liquid to be measured for a fixed distance, and obtain an oxygen concentration nominal value of the liquid to be measured according to the transmission time. The output display unit 50 is used for obtaining an oxygen concentration measurement value according to the nominal oxygen concentration value and the temperature compensation value, and outputting the oxygen concentration measurement value. In one embodiment, the ultrasonic dissolved oxygen meter further includes an environmental parameter compensation unit 60, configured to obtain a measured environmental factor parameter of each liquid to be measured by measurement, and obtain an oxygen environmental compensation value according to a correspondence between each measured environmental factor parameter and an oxygen environmental compensation value corresponding to the measured environmental factor parameter, so as to compensate the oxygen concentration measurement value by the oxygen environmental compensation value. Wherein the measured environmental factor parameter comprises atmospheric pressure, liquid PH, liquid measurement depth, liquid suspended matter concentration, and/or atmospheric oxygen concentration.
The embodiment of the application discloses an oxygen concentration measuring method based on ultrasonic waves, which comprises the steps of firstly, obtaining a density value of liquid to be measured according to physical transmission characteristic parameters of ultrasonic signals with preset frequencies in the liquid to be measured; acquiring a temperature compensation value corresponding to the density value of the liquid to be detected according to the temperature value of the liquid; then acquiring the transmission time required by the ultrasonic signal with the frequency of a first frequency value when the ultrasonic signal is transmitted for a fixed distance in the liquid to be detected, and acquiring the oxygen concentration nominal value of the liquid to be detected; and finally, obtaining an oxygen concentration measurement value according to the oxygen concentration nominal value and the temperature compensation value. The concentration value of the liquid to be measured is obtained through the ultrasonic signal, and then the measured oxygen concentration value is compensated according to the temperature compensation value corresponding to the concentration value of the liquid to be measured, so that the measurement accuracy of the ultrasonic dissolved oxygen meter is greatly improved.
Those skilled in the art will appreciate that all or part of the functions of the various methods in the above embodiments may be implemented by hardware, or may be implemented by a computer program. When all or part of the functions in the above embodiments are implemented by means of a computer program, the program may be stored in a computer readable storage medium, and the storage medium may include: read-only memory, random access memory, magnetic disk, optical disk, hard disk, etc., and the program is executed by a computer to realize the above-mentioned functions. For example, the program is stored in the memory of the device, and when the program in the memory is executed by the processor, all or part of the functions described above can be realized. In addition, when all or part of the functions in the above embodiments are implemented by means of a computer program, the program may be stored in a storage medium such as a server, another computer, a magnetic disk, an optical disk, a flash disk, or a removable hard disk, and the program in the above embodiments may be implemented by downloading or copying the program into a memory of a local device or updating a version of a system of the local device, and when the program in the memory is executed by a processor.
The foregoing description of the invention has been presented for purposes of illustration and description, and is not intended to be limiting. Several simple deductions, modifications or substitutions may also be made by a person skilled in the art to which the invention pertains, based on the idea of the invention.
Claims (10)
1. An ultrasonic-based oxygen concentration measurement method, comprising:
acquiring physical transmission characteristic parameters of at least one ultrasonic signal with preset frequency in liquid to be detected and a temperature value of the liquid to be detected;
acquiring a density value of the liquid to be detected according to the value of each preset frequency and the physical transmission characteristic parameter;
inputting the density value and the temperature value of the liquid to be measured into a preset temperature compensation mathematical model to obtain a temperature compensation value corresponding to the density value of the liquid to be measured, which is output by the temperature compensation mathematical model;
acquiring the transmission time required by transmitting an ultrasonic signal with a first frequency value in a liquid to be measured for a fixed distance;
acquiring an oxygen concentration nominal value of the liquid to be detected according to the transmission time;
and obtaining the oxygen concentration measured value according to the oxygen concentration nominal value and the temperature compensation value, and outputting the oxygen concentration measured value.
2. The method for measuring oxygen concentration according to claim 1, wherein the step of obtaining physical transmission characteristic parameters of at least one ultrasonic signal of a predetermined frequency in the liquid to be measured comprises:
acquiring the transmission speed of the ultrasonic signal of each preset frequency in the liquid to be detected;
and acquiring the density of the liquid to be detected according to the corresponding relation between the transmission speed and the liquid density when the ultrasonic signals with each preset frequency are transmitted in the liquid.
3. The oxygen concentration measurement method according to claim 1, wherein the temperature compensation mathematical model acquisition method includes:
establishing a corresponding relation between the liquid temperature, a time difference and an oxygen concentration compensation value under different liquid densities in a calibrated mode, wherein the time difference is used for representing the transmission time required by the ultrasonic signal with a first frequency value when the ultrasonic signal is transmitted for a fixed distance in the liquid;
the corresponding relation between the established liquid temperature, time difference and the oxygen concentration compensation value is represented by a fitting equation, wherein the fitting equation is as follows:
Co=f(To，Δt)；
where Co represents an oxygen concentration compensation value, to represents a liquid temperature, and Δt represents a time difference.
4. The oxygen concentration measuring method according to claim 3, wherein at least one density value interval is set in a preset density range interval, and the liquid to be measured whose density value is in the same density value interval corresponds to one of the fitting equations.
5. The oxygen concentration measurement method according to claim 3, wherein the fitting equation is obtained by using a piecewise linear fitting method and/or a least squares polynomial fitting method.
6. The oxygen concentration measurement method according to claim 1, characterized by further comprising:
acquiring a measurement environment factor parameter for measuring the liquid to be measured; the measured environmental factor parameters include atmospheric pressure, liquid PH, liquid measurement depth, liquid suspended matter concentration, and/or atmospheric oxygen concentration;
acquiring an oxygen environment compensation value corresponding to each measured environment factor parameter;
and compensating the oxygen concentration measured value according to the oxygen environment compensation value and outputting the compensated oxygen concentration measured value.
7. The oxygen concentration measuring method according to claim 6, wherein the method for acquiring the correspondence between the measured environmental factor parameter and the oxygen environment compensation value comprises:
acquiring a relation curve of each measured environmental factor parameter and the corresponding oxygen environment compensation value by a sampling measurement mode;
performing equation fitting on the acquired relation curve of the measured environmental factor parameter and the oxygen environment compensation value corresponding to the measured environmental factor parameter to acquire an environmental parameter fitting equation; the environmental parameter fitting equation is used for representing the corresponding relation between the measured environmental factor parameter and the oxygen environment compensation value.
8. A computer-readable storage medium, characterized in that the medium has stored thereon a program that is executable by a processor to implement the oxygen concentration measurement method according to any one of claims 1 to 7.
9. An ultrasonic oximeter for applying the oxygen concentration measurement method according to any one of claims 1 to 7, comprising:
the detection unit is used for acquiring physical transmission characteristic parameters of at least one ultrasonic signal with preset frequency in the liquid to be detected and a temperature value of the liquid to be detected;
a density obtaining unit, configured to obtain a density value of the liquid to be measured according to each value of the preset frequency and the physical transmission characteristic parameter;
the temperature compensation unit is used for inputting the density value and the temperature value of the liquid to be detected into a preset temperature compensation mathematical model so as to obtain a temperature compensation value which is output by the temperature compensation mathematical model and corresponds to the density value of the liquid to be detected;
the concentration detection unit is used for obtaining the transmission time required by the transmission of the ultrasonic signal with the frequency of a first frequency value in the liquid to be detected for a fixed distance, and obtaining the nominal value of the oxygen concentration of the liquid to be detected according to the transmission time;
and the output display unit is used for acquiring the oxygen concentration measured value according to the oxygen concentration nominal value and the temperature compensation value and outputting the oxygen concentration measured value.
10. The ultrasonic oximeter of claim 9, further comprising:
the environment parameter compensation unit is used for obtaining the measured environment factor parameters of each liquid to be measured through measurement, and obtaining an oxygen environment compensation value according to the corresponding relation between each measured environment factor parameter and the corresponding oxygen environment compensation value so as to compensate the oxygen concentration measurement value through the oxygen environment compensation value; wherein the measured environmental factor parameter comprises atmospheric pressure, liquid PH, liquid measurement depth, liquid suspended matter concentration, and/or atmospheric oxygen concentration.
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| CN202310358768.5A CN116297824A (en) | 2023-03-29 | 2023-03-29 | Ultrasonic-based oxygen concentration measurement method and ultrasonic dissolved oxygen meter |
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| CN202310358768.5A CN116297824A (en) | 2023-03-29 | 2023-03-29 | Ultrasonic-based oxygen concentration measurement method and ultrasonic dissolved oxygen meter |
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