Liquid concentration detection system, method, apparatus, and storage medium

Abstract

The application discloses a liquid concentration detection system, method and device and a storage medium, and relates to the technical field of concentration detection. The liquid concentration detection system comprises a light source generator, a first transmission light path, an optical fiber sensor, a second transmission light path and a processing device which are sequentially connected. The light source generator generates two light frequency comb light sources with different frequencies. The two light frequency comb light sources periodically overlap in the time domain to form a first interference spectrum. The first transmission light path transmits the first interference spectrum to the optical fiber sensor. The optical fiber sensor receives two light frequency combs refracted by a liquid to form a second interference spectrum. The second transmission light path transmits the second interference spectrum to the processing device. The processing device processes the received second interference spectrum to obtain a resonance peak wavelength shift amount. The liquid concentration is determined according to the resonance peak wavelength shift amount. The application can improve the measurement speed of the liquid concentration.

Description

Technical Field

[0001] This invention relates to the field of concentration detection technology, and in particular to a liquid concentration detection system, method, apparatus and storage medium. Background Technology

[0002] Concentration is one of the important parameters characterizing the properties of a solution. The measurement and control of solution concentration has wide applications in industries such as papermaking, chemical engineering, sugar refining, food processing, and pharmaceuticals. It is a crucial technical means to ensure and improve product quality. There are many methods for measuring concentration; currently, the more mature and widely used methods include capacitance measurement, photoelectric measurement, ultrasonic grating measurement, and grazing incidence measurement.

[0003] In photoelectric detection of liquid concentration, the correlation between liquid concentration and refractive index can be utilized. However, fiber optic detection systems in related technologies require a broadband light source as the excitation source to obtain a transmission spectrum covering the resonant peak wavelength shift range. A spectrometer is used for data recording at the back end, and the measurement process necessitates scanning wavelengths at different frequency bands, which reduces the system's measurement speed and is not conducive to real-time monitoring. Summary of the Invention

[0004] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention proposes a liquid concentration detection system, method, apparatus, and storage medium, which can improve the measurement speed of liquid concentration.

[0005] On one hand, embodiments of the present invention provide a liquid concentration detection system, including a light source generator, a first transmission optical path, an optical fiber sensor, a second transmission optical path, and a processing device connected in sequence, wherein the optical fiber sensor is used to be placed in the liquid;

[0006] The light source generator is used to generate two optical frequency comb light sources with different frequencies. The two optical frequency comb light sources periodically overlap in the time domain to form a first interference spectrum.

[0007] The first transmission optical path is used to transmit the first interference spectrum to the fiber optic sensor;

[0008] The fiber optic sensor is used to receive the second interference spectrum formed by the two optical frequency combs after being refracted by the liquid.

[0009] The second transmission optical path is used to transmit the second interference spectrum to the processing device;

[0010] The processing device is used to process the received second interference spectrum to obtain the resonant peak wavelength shift, and to determine the liquid concentration based on the resonant peak wavelength shift.

[0011] According to some embodiments of the present invention, the light source generator includes an erbium-doped fiber laser and an fiber amplifier. The erbium-doped fiber laser is used to generate two optical frequency comb light sources with different frequencies based on the same resonant cavity. The fiber amplifier is used to amplify the power and broaden the spectrum of the two optical frequency comb light sources.

[0012] According to some embodiments of the present invention, both the first transmission optical path and the second transmission optical path are composed of single-mode transmission optical fiber.

[0013] According to some embodiments of the present invention, the fiber optic sensor includes a tapered optical fiber and a transparent container, the transparent container being sleeved and fixed at the tapered region of the tapered optical fiber, and the transparent container being provided with a through hole for allowing liquid to enter the transparent container.

[0014] According to some embodiments of the present invention, the processing device includes a photodetector and a processor;

[0015] The photodetector is used to convert the optical signal of the second interference spectrum into an electrical signal to obtain the interference signal;

[0016] The processor is used to perform a Fourier transform on the interference signal to obtain a spectral signal, extract the signal of the frequency component with the weakest light intensity in the spectral signal to obtain a resonant signal, determine the wavelength of the first resonant peak based on the resonant signal, determine the wavelength shift of the resonant peak based on the wavelength of the first resonant peak and the corresponding wavelength of the second resonant peak in the first interference spectrum, and determine the liquid concentration based on the wavelength shift of the resonant peak and an empirical formula.

[0017] According to some embodiments of the present invention, the empirical formula is obtained through the following steps:

[0018] The fiber optic sensor was sequentially placed into multiple groups of liquid samples with known concentrations.

[0019] The light source generator is started and the light signal after passing through each group of liquid samples is analyzed by the processing device to obtain the resonant peak wavelength shift corresponding to each group of liquid samples.

[0020] An empirical formula is obtained by curve fitting using the liquid concentration as the dependent variable and the resonant peak wavelength shift as the independent variable.

[0021] On the other hand, embodiments of the present invention also provide a liquid concentration detection method, applied in the processing device of the liquid concentration detection system as described in the preceding embodiments, the liquid concentration detection method comprising the following steps:

[0022] The received second interference spectrum is processed to obtain the resonant peak wavelength shift;

[0023] The liquid concentration is determined based on the wavelength shift of the resonant peak.

[0024] According to some embodiments of the present invention, processing the received second interference spectrum to obtain the resonant peak wavelength shift includes the following steps:

[0025] The optical signal of the second interference spectrum is converted into an electrical signal to obtain the interference signal;

[0026] The interference signal is subjected to Fourier transform to obtain the spectral signal;

[0027] The resonant signal is obtained by extracting the frequency component with the weakest light intensity from the spectrum signal.

[0028] The wavelength of the first resonant peak is determined based on the resonant signal;

[0029] The wavelength shift of the resonance peak is determined based on the wavelength of the first resonance peak and the corresponding wavelength of the second resonance peak in the first interference spectrum.

[0030] Determining the liquid concentration based on the resonant peak wavelength shift includes the following steps:

[0031] The liquid concentration is determined based on the wavelength shift of the resonant peak and empirical formulas.

[0032] On the other hand, embodiments of the present invention also provide a liquid concentration detection device, comprising:

[0033] At least one processor;

[0034] At least one memory for storing at least one program;

[0035] When the at least one program is executed by the at least one processor, the at least one processor implements the liquid concentration detection method as described above.

[0036] On the other hand, embodiments of the present invention also provide a computer-readable storage medium storing computer-executable instructions for causing a computer to perform the liquid concentration detection method as described above.

[0037] The technical solution described above has at least one of the following advantages or beneficial effects: The liquid concentration detection system includes a light source generator, a first transmission optical path, an optical fiber sensor, a second transmission optical path, and a processing device connected in sequence. The light source generator can generate two optical frequency comb light sources with different frequencies. The two optical frequency comb light sources periodically overlap in the time domain to form a first interference spectrum. The first transmission optical path transmits the first interference spectrum to the optical fiber sensor. The optical fiber sensor receives the two optical frequency combs refracted by the liquid to form a second interference spectrum. The second transmission optical path transmits the second interference spectrum to the processing device. The processing device processes the received second interference spectrum to obtain the resonant peak wavelength shift, and determines the liquid concentration based on the resonant peak wavelength shift. This application uses a dual optical frequency comb light source instead of a traditional light source. The processing device does not need to be combined with a spectrometer for wavelength scanning, enabling high-speed analysis of the transmission spectrum, thereby quickly obtaining the concentration value of the liquid to be tested. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the liquid concentration detection system provided in an embodiment of the present invention;

[0039] Figure 2 This is a schematic diagram of the fiber optic sensor provided in an embodiment of the present invention. Detailed Implementation

[0040] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar originals or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0041] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0042] In the description of this invention, the use of terms such as "first," "second," etc., is merely for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of technical features indicated, or implicitly indicating the order of the technical features indicated.

[0043] This invention provides a liquid concentration detection system, referring to... Figure 1 The liquid concentration detection system includes a light source generator, a first transmission optical path, an optical fiber sensor, a second transmission optical path, and a processing device connected in sequence. The optical fiber sensor is used to place in the liquid to be measured.

[0044] The light source generator is used to generate two optical frequency comb light sources with different frequencies. The two optical frequency comb light sources periodically overlap in the time domain to form a first interference spectrum. The first transmission optical path is used to transmit the first interference spectrum to the optical fiber sensor. The optical fiber sensor is used to receive the two optical frequency combs formed by refraction through the liquid to form a second interference spectrum. The second transmission optical path is used to transmit the second interference spectrum to the processing device. The processing device is used to process the received second interference spectrum to obtain the resonant peak wavelength shift, and to determine the liquid concentration based on the resonant peak wavelength shift.

[0045] According to some specific embodiments of the present invention, the light source generator includes an erbium-doped fiber laser and an fiber amplifier. The erbium-doped fiber laser is used to generate two optical frequency comb light sources with different frequencies based on the same resonant cavity, and the fiber amplifier is used to amplify the power and broaden the spectrum of the two optical frequency comb light sources.

[0046] In this embodiment, the erbium-doped fiber laser includes a pump source and a resonant cavity. The erbium-doped fiber laser can be a unidirectional or bidirectional erbium-doped fiber laser. The output wavelength bandwidth of the erbium-doped fiber laser must cover the wavelength range of the transmission spectrum resonant peak drift in response to possible refractive index changes in the liquid. The pump source is used to excite the laser gain medium. The laser gain medium itself cannot achieve population inversion; this process requires the excitation of the pump source. Particles at lower energy levels are excited by the pump light to transition to higher energy levels, causing the number of particles at higher energy levels to gradually increase, eventually exceeding the number of particles at lower energy levels, achieving population inversion. The pumping method can be optical pumping. The resonant cavity is used to generate laser oscillations in the two inverted laser gain media. Under the feedback of the resonant cavity, the number of photons in the laser gain medium can travel back and forth within the resonant cavity and be continuously amplified, ultimately forming a strong beam with the same propagation direction, frequency, and phase within the cavity, thereby generating two optical frequency comb light sources. In this embodiment, the resonant cavity uses a dual optical comb as the excitation source, which reduces the complexity and size of the liquid concentration detection system and is suitable for on-site monitoring.

[0047] In this embodiment, the light source generator outputs two frequencies, f0 and f1 respectively. r and f r +Δf r The mode-locked pulse, i.e., the optical frequency comb. The two optical frequency combs will periodically overlap in the time domain, forming a pulse with a time period of 1 / Δf. r The first interference signal, where Δf rThis refers to the frequency repetition rate difference. For example, the total power of the two asynchronous mode-locked pulses output by the light source generator is 3.45mW, with center wavelengths at 1546.23nm and 1558.96nm, respectively. Their repetition rates are 154.679185MHz and 154.675550MHz, respectively, resulting in a frequency repetition rate difference of 3.635kHz. The corresponding dual-comb spectral detection range is 26.3nm. An erbium-doped fiber amplifier can be used, amplifying the two pulses to a total power of 145mW. After spectral broadening, the overlap range (3dB) is approximately 1545-1562nm.

[0048] According to some embodiments of the present invention, both the first and second transmission optical paths are composed of single-mode transmission optical fibers. For example, a 1.55μm communication band single-mode transmission optical fiber can be used, and the fiber size can be 9 / 125μm.

[0049] According to some embodiments of the present invention, with reference to Figure 2 The fiber optic sensor includes a tapered optical fiber 110 and a transparent container 120. The transparent container is fitted onto the tapered section of the tapered optical fiber and secured with adhesive at both ends to prevent the tapered optical fiber from breaking. The transparent container has a through-hole, allowing liquid to enter the container. The transparent container can be a glass container, and the tapered optical fiber can be replaced with a microporous optical fiber.

[0050] Furthermore, the transparent container can be protected by a movable protective sleeve 130, which can be a soft plastic sleeve. The tapered optical fiber can be formed by fused tapering of the same single-mode transmission optical fiber as the first and second transmission optical paths.

[0051] In this embodiment, two optical frequency comb light sources are simultaneously incident on the fiber optic sensor via the first transmission optical path. Based on the principle of interference, the fiber optic sensor converts the liquid refractive index into the resonant peak wavelength shift of the transmission spectrum. Then, the second transmission optical path outputs a time-domain interference spectrum carrying information about the refractive index change. The interference spectrum is sent to a data recording module for photoelectric conversion, acquisition, and processing to obtain the resonant peak wavelength shift. Since the liquid refractive index and liquid concentration have a linear relationship, the liquid concentration can be calculated from the resonant peak wavelength shift.

[0052] According to some embodiments of the present invention, the processing device includes a photodetector and a processor;

[0053] A photodetector is used to convert the optical signal of the second interference spectrum into an electrical signal to obtain the interference signal;

[0054] The processor performs a Fourier transform on the interference signal to obtain a spectral signal, extracts the weakest frequency component from the spectral signal to obtain a resonant signal, determines the wavelength of the first resonant peak based on the resonant signal, determines the wavelength shift of the resonant peak based on the wavelength of the first resonant peak and the corresponding wavelength of the second resonant peak in the first interference spectrum, and determines the liquid concentration based on the wavelength shift of the resonant peak and an empirical formula.

[0055] In some other embodiments, the processing device may use a photomultiplier tube photodetector for photoelectric conversion. The photodetector may be a germanium photodiode detector with a wavelength response range of 800-1800nm.

[0056] Furthermore, the photodetector and the processor are connected via a data acquisition card, which is used to acquire the photoelectric converted signal at high speed.

[0057] In this embodiment, the processing device performs a Fourier transform on the received interference signal to obtain a spectral signal, the upper limit of the optical frequency of the spectral signal being f. r 2 / 2Δf r Then, the weakest frequency component in the spectrum signal is extracted using the minimum value search method to obtain the resonant signal. The wavelength of the first resonant peak is obtained by waveform analysis of the resonant signal. Then, the wavelength shift of the resonant peak is determined based on the wavelength of the first resonant peak and the corresponding wavelength of the second resonant peak in the first interference spectrum. The liquid concentration is determined based on the wavelength shift of the resonant peak and an empirical formula. The wavelength of the second resonant peak can also be obtained by photoelectric conversion, minimum value search method and waveform analysis of the interference signal received after the first interference spectrum is refracted by air. The processing of the second interference spectrum is the same as described above, and the specific details of this embodiment will not be repeated.

[0058] In this embodiment, after obtaining the resonant peak wavelength shift, the corresponding liquid concentration value can be determined according to the empirical formula between the resonant peak wavelength shift and the liquid concentration. Alternatively, the corresponding refractive index value can be determined first according to the empirical formula between the resonant peak wavelength shift and the refractive index, and then the liquid concentration value can be determined according to the empirical formula between the refractive index and the liquid concentration.

[0059] Specifically, the empirical formula relating the resonant peak wavelength shift to the liquid concentration can be obtained through the following steps:

[0060] The fiber optic sensor was sequentially placed into multiple groups of liquid samples with known concentrations.

[0061] The light source generator is started and the light signal after passing through each group of liquid samples is analyzed by the processing device to obtain the resonant peak wavelength shift corresponding to each group of liquid samples.

[0062] An empirical formula was obtained by curve fitting with liquid concentration as the dependent variable and resonant peak wavelength shift as the independent variable.

[0063] For example, several groups of liquid samples with known concentrations are prepared. The fiber optic sensor is placed into each group of samples and allowed to stand for a period of time to allow the samples to be uniformly dispersed within the glass container. The dual-comb light source generated by the light source generator enters the fiber optic sensor through the first transmission optical path and is then sent to the processing device through the second transmission optical path. The processing device processes and analyzes the received signal to obtain the resonant peak wavelength shift. This resonant peak wavelength shift is then combined with the corresponding liquid concentration value of the sample to form a set of known data. Furthermore, by fitting multiple sets of known data from multiple samples, an empirical formula relating the resonant peak wavelength shift to the liquid concentration can be obtained.

[0064] This invention also provides a liquid concentration detection method, which is applied to the processing device of the liquid concentration detection system described in the previous embodiments. The liquid concentration detection method of this invention includes, but is not limited to, steps S110 and S120.

[0065] Step S110: Process the received second interference spectrum to obtain the resonant peak wavelength shift;

[0066] Step S120: Determine the liquid concentration based on the resonant peak wavelength shift.

[0067] According to some embodiments of the present invention, step S110, processing the received second interference spectrum to obtain the resonant peak wavelength shift, includes the following steps:

[0068] Step S111: Convert the optical signal of the second interference spectrum into an electrical signal to obtain an interference signal;

[0069] Step S112: Perform a Fourier transform on the interference signal to obtain the spectral signal;

[0070] Step S113: Extract the signal of the frequency component with the weakest light intensity from the spectrum signal to obtain the resonant signal;

[0071] Step S114: Determine the wavelength of the first resonant peak based on the resonant signal;

[0072] Step S115: Determine the wavelength shift of the resonance peak based on the wavelength of the first resonance peak and the corresponding wavelength of the second resonance peak in the first interference spectrum.

[0073] In step S120, determining the liquid concentration based on the resonant peak wavelength shift includes the following steps:

[0074] Step S121: Determine the liquid concentration based on the wavelength shift of the resonant peak and an empirical formula.

[0075] It is understood that the contents of the above liquid concentration detection system embodiments are all applicable to this method embodiment. The specific functions implemented by this method embodiment are the same as those of the above liquid concentration detection system embodiments, and the beneficial effects achieved are also the same as those achieved by the above liquid concentration detection system embodiments.

[0076] This invention also provides a schematic diagram of a liquid concentration detection device. The liquid concentration detection device of this invention includes one or more control processors and a memory. The control processor and the memory can be connected via a bus or other means. The memory, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs and non-transitory computer-executable programs. Furthermore, the memory may include high-speed random access memory and non-transitory memory, such as at least one disk storage device, flash memory device, or other non-transitory solid-state storage device. In some embodiments, the memory may optionally include memory remotely located relative to the control processor, and these remote memories can be connected to the liquid concentration detection device via a network. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof. The non-transitory software programs and instructions required by the processor to implement the liquid concentration detection method applied to the liquid concentration detection device in the above embodiments are stored in the memory, and when executed by the control processor, the liquid concentration detection method applied to the liquid concentration detection device in the above embodiments is executed.

[0077] Furthermore, one embodiment of the present invention provides a computer-readable storage medium storing computer-executable instructions that are executed by one or more control processors, causing the one or more control processors to perform the liquid concentration detection method in the above method embodiment.

[0078] It will be understood by those skilled in the art that all or some of the steps and systems in the methods disclosed above can be implemented as software, firmware, hardware, and suitable combinations thereof. Some or all of the physical components can be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application-specific integrated circuit. Such software can be distributed on a computer-readable medium, which can include computer storage media (or non-transitory media) and communication media (or transient media). As is known to those skilled in the art, the term computer storage media includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules, or other data). Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disc (DVD) or other optical disc storage, magnetic cartridges, magnetic tape, disk storage or other magnetic storage devices, or any other medium that can be used to store desired information and is accessible to a computer. Furthermore, as is known to those skilled in the art, communication media typically contain computer-readable instructions, data structures, program modules, or other data in modulated data signals such as carrier waves or other transmission mechanisms, and may include any information delivery medium.

[0079] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A liquid concentration detection system, characterized in that, It includes a light source generator, a first transmission optical path, an optical fiber sensor, a second transmission optical path, and a processing device connected in sequence, wherein the optical fiber sensor is used to be placed in a liquid; The light source generator is used to generate two optical frequency comb light sources with different frequencies, the two optical frequency comb light sources being respectively... and The asynchronous mode-locked pulses, the two optical frequency comb light sources, periodically overlap in the time domain to form a period of... The first interference spectrum; the wavelength bandwidth of the first interference spectrum covers the wavelength range of the transmission spectrum resonance peak shift in response to possible changes in the refractive index of the liquid; This is the frequency difference; The first transmission optical path is used to transmit the first interference spectrum to the fiber optic sensor; The fiber optic sensor is used to receive the second interference spectrum formed by the two optical frequency combs after being refracted by the liquid. The second transmission optical path is used to transmit the second interference spectrum to the processing device; The processing device includes a photodetector and a processor; The photodetector is used to convert the optical signal of the second interference spectrum into an electrical signal to obtain the interference signal; The processor is used to perform a Fourier transform on the interference signal to obtain a spectral signal, extract the signal of the weakest frequency component in the spectral signal to obtain a resonant signal, determine the wavelength of the first resonant peak based on the resonant signal, determine the wavelength offset of the resonant peak based on the wavelength of the first resonant peak and the corresponding wavelength of the second resonant peak in the first interference spectrum, and determine the liquid concentration based on the wavelength offset of the resonant peak and an empirical formula.

2. The liquid concentration detection system according to claim 1, characterized in that, The light source generator includes an erbium-doped fiber laser and an fiber amplifier. The erbium-doped fiber laser is used to generate two optical frequency comb light sources with different frequencies based on the same resonant cavity. The fiber amplifier is used to amplify the power and broaden the spectrum of the two optical frequency comb light sources.

3. The liquid concentration detection system according to claim 1, characterized in that, Both the first and second transmission optical paths are composed of single-mode transmission optical fibers.

4. The liquid concentration detection system according to claim 1, characterized in that, The fiber optic sensor includes a tapered optical fiber and a transparent container. The transparent container is fitted and fixed at the tapered section of the tapered optical fiber. The transparent container is provided with a through hole for allowing liquid to enter the transparent container.

5. The liquid concentration detection system according to claim 1, characterized in that, The empirical formula is obtained through the following steps: The fiber optic sensor was sequentially placed into multiple groups of liquid samples with known concentrations. The light source generator is started and the light signal after passing through each group of liquid samples is analyzed by the processing device to obtain the resonant peak wavelength shift corresponding to each group of liquid samples. An empirical formula is obtained by curve fitting using the liquid concentration as the dependent variable and the resonant peak wavelength shift as the independent variable.

6. A method for detecting liquid concentration, characterized in that, The liquid concentration detection method, applied in the processing device of the liquid concentration detection system as described in claim 1, includes the following steps: The optical signal of the second interference spectrum is converted into an electrical signal to obtain the interference signal; The interference signal is subjected to Fourier transform to obtain a spectrum signal, and the frequency component with the weakest light intensity in the spectrum signal is extracted to obtain a resonant signal; The wavelength of the first resonance peak is determined based on the resonance signal, and the wavelength offset of the resonance peak is determined based on the wavelength of the first resonance peak and the corresponding wavelength of the second resonance peak in the first interference spectrum. The liquid concentration is determined based on the resonant peak wavelength shift and empirical formulas.

7. The liquid concentration detection method according to claim 6, characterized in that, The process of processing the received second interference spectrum to obtain the resonant peak wavelength shift includes the following steps: The optical signal of the second interference spectrum is converted into an electrical signal to obtain the interference signal; The interference signal is subjected to Fourier transform to obtain the spectral signal; The resonant signal is obtained by extracting the frequency component with the weakest light intensity from the spectrum signal. The wavelength of the first resonant peak is determined based on the resonant signal; The wavelength offset of the resonance peak is determined based on the wavelength of the first resonance peak and the corresponding wavelength of the second resonance peak in the first interference spectrum. Determining the liquid concentration based on the resonant peak wavelength shift includes the following steps: The liquid concentration is determined based on the resonant peak wavelength shift and empirical formulas.

8. A liquid concentration detection device, characterized in that, include: At least one processor; At least one memory for storing at least one program; When the at least one program is executed by the at least one processor, the at least one processor implements the liquid concentration detection method as described in any one of claims 6 to 7.

9. A computer-readable storage medium storing a processor-executable program, characterized in that, When the processor executes the program, it is used to implement the liquid concentration detection method as described in any one of claims 6 to 7.

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