Real-time concentration detection device and detection method for o-phthalaldehyde disinfectant

Abstract

The invention discloses a device and a method for detecting the real-time concentration of an o-phthalaldehyde disinfectant. The device comprises a constant-speed liquid dropping device and a self-powered liquid sensor, the self-powered liquid sensor comprises a glass substrate (1), a bottom electrode (2) is arranged on the glass substrate (1), a dielectric layer (3) is arranged on the bottom electrode (2), and a top electrode (4) is arranged on the dielectric layer (3); a sample dropping port of the constant-speed liquid dropping device is arranged above the top electrode (4) and is used for realizing uniform dropping of an o-phthalaldehyde disinfectant and enabling the o-phthalaldehyde disinfectant to flow through the top electrode (4) from top to bottom; the top electrode (4) and the bottom electrode (2) are connected with an oscilloscope through signal pin electrodes, and the output end of the oscilloscope is connected with a machine learning processing module. The method can detect the concentration of the o-phthalaldehyde disinfectant in real time, and has the advantages of high detection speed, accurate detection result, high sensitivity and low cost.

Description

Technical Field

[0001] The present invention relates to the field of liquid sample detection and analysis, and in particular to a real-time concentration detection device and a detection method for o-phthalaldehyde disinfectant. Background Art

[0002] With the continuous advancement of medical technology, awareness of infection prevention and control has become increasingly widespread, especially in medical settings. Monitoring the effectiveness of disinfectants is also gaining increasing attention. Ortho-phthalaldehyde (OPA), a new, highly effective disinfectant, has gradually become the preferred solution for chemical immersion disinfection of reusable medical devices due to its broad-spectrum bactericidal activity (including against Mycobacterium tuberculosis and bacterial spores), low irritation, and rapid action.

[0003] However, clinical practice has shown that OPA disinfectants experience concentration decay during immersion. This phenomenon directly impacts their bactericidal efficacy, and excessively low concentrations can lead to disinfection failure, impacting patient health and safety. Monitoring disinfectant concentration plays a crucial role in assessing product safety, ensuring compliance with relevant regulations and standards during use. Therefore, achieving real-time, accurate monitoring of OPA solution concentration is crucial for ensuring the quality of medical device disinfection.

[0004] The purpose of OPA disinfectant concentration monitoring is to dynamically monitor the type, concentration, and properties of various components in the OPA solution in real time. Common analytical methods include gas chromatography, liquid chromatography, mass spectrometry, Fourier transform infrared spectroscopy, ultraviolet-visible spectroscopy, high-resolution nuclear magnetic resonance, elemental analysis, and thermogravimetric analysis. However, although these methods have high accuracy, they have significant drawbacks: (1) professional operators are required to take samples and then leave the site for testing, which makes it impossible to achieve real-time monitoring of the workplace; (2) the detection time and cycle are long, making it difficult to guide the replacement of disinfectants in a timely manner; (3) the instruments and equipment are expensive and complex to maintain, making it difficult to popularize them in primary medical institutions. Therefore, this detection technology is mainly used in laboratory environments, which limits its feasibility in portable, on-site, or real-time applications. In existing medical settings, the qualitative detection method of concentration colorimetric cards is usually used to determine whether the OPA concentrate is at an effective concentration. There are many uncertainties in the detection process, such as the quality of the colorimetric card itself and the influence of human subjective factors during interpretation. Therefore, exploring new detection technologies and miniaturized equipment for the concentration of o-phthalaldehyde solutions plays a vital role in maintaining the effectiveness of disinfectants, thereby promoting the development of the medical disinfection industry and protecting the lives, health and safety of patients. Summary of the Invention

[0005] The present invention aims to provide a device and method for detecting the real-time concentration of o-phthalaldehyde disinfectant. The present invention can detect the concentration of o-phthalaldehyde disinfectant in real time and has the advantages of fast detection speed, accurate detection results, high sensitivity and low cost.

[0006] In order to achieve the above-mentioned purpose, the technical solution provided by the present invention is as follows: a real-time concentration detection device for o-phthalaldehyde disinfectant, comprising a uniform dripping device and a self-powered liquid sensor; the self-powered liquid sensor comprises a glass substrate, a bottom electrode is provided on the glass substrate, a dielectric layer is provided on the bottom electrode, and a top electrode is provided on the dielectric layer; the dripping port of the uniform dripping device is provided above the top electrode, for achieving uniform dripping of o-phthalaldehyde disinfectant and flowing through the top electrode from top to bottom; the top electrode and the bottom electrode are connected to an oscilloscope through signal pin electrodes, and the output end of the oscilloscope is connected to a machine learning processing module.

[0007] The above-mentioned real-time concentration detection device for o-phthalaldehyde disinfectant, the uniform dripping device includes a liquid storage tank, a dripping tube, an air inlet pipe and a dripping tank; the liquid storage tank is connected to the dripping tank through the dripping tube, and the self-powered liquid sensor is arranged obliquely in the dripping tank, and the dripping port of the dripping tube faces the top electrode of the self-powered liquid sensor.

[0008] The aforementioned real-time concentration detection device for o-phthalaldehyde disinfectant, the liquid storage tank is a rectangular structure with a length of 10 cm, a width of 10 cm, a height of 15 cm, a wall thickness of 2 mm, and a material of polytetrafluoroethylene; the liquid storage tank is provided with an injection port, a dripping port and an air inlet, wherein the injection port has a diameter of 2.5 cm, the dripping port has a diameter of 3 mm, and the air inlet has a diameter of 3 mm.

[0009] The aforementioned real-time concentration detection device for o-phthalaldehyde disinfectant has an outer diameter of 3 mm, an inner diameter of 2.5 mm, a length of 5 cm, and is made of polytetrafluoroethylene; the outer diameter of the air inlet pipe is 3 mm, an inner diameter of 2.5 mm, a length of 10 cm, and is made of polytetrafluoroethylene.

[0010] The aforementioned real-time concentration detection device for o-phthalaldehyde disinfectant, the dripping tank is a rectangular structure with a length of 10 cm, a width of 10 cm, a height of 15 cm, a wall thickness of 2 mm, and a material of polytetrafluoroethylene. The dripping tank is provided with a dripping port and a discharge port, wherein the diameter of the dripping port is 3 mm and the diameter of the discharge port is 1 cm.

[0011] The aforementioned o-phthalaldehyde disinfectant real-time concentration detection device has a rectangular glass substrate with a length of 10 cm, a width of 8 cm, and a thickness of 3 mm, and is made of silicon dioxide.

[0012] The aforementioned real-time concentration detection device for o-phthalaldehyde disinfectant, the bottom electrode includes four first electrodes of the same rectangular shape; the bottom electrode is connected to the first signal pin electrode at the edge of the device through a first electrode lead, and the first signal pin electrode is connected to the oscilloscope; the first electrode has a thickness of 1 μm, a length of 1 cm, and a width of 0.8 cm, and the material is one of gold, platinum or aluminum.

[0013] In the aforementioned real-time concentration detection device for o-phthalaldehyde disinfectant, the dielectric layer is rectangular, 8 cm in length, 6 cm in width, and 4 mm in thickness, and is made of PDMS.

[0014] The aforementioned real-time concentration detection device for o-phthalaldehyde disinfectant, the top electrode includes four second electrodes of the same rectangular shape, the top electrode is connected to the second signal pin electrode through the second electrode lead, and the second signal pin electrode is connected to the oscilloscope; the second electrode has a length of 0.5 cm, a width of 0.4 cm, and a thickness of 1 μm, and the material is one of gold, platinum or aluminum.

[0015] The detection method of the aforementioned real-time concentration detection device for o-phthalaldehyde disinfectant uses a uniform dripping device to add o-phthalaldehyde disinfectant in the form of droplets onto a self-powered liquid sensor, and flows through the top electrode from top to bottom in sequence. When the droplets flow through the top electrode, a voltage signal is generated by the frictional electrification effect. The voltage signal is then measured using an oscilloscope and input into a machine learning processing module. The characteristics of different voltage signals are analyzed by the machine learning processing module to determine the concentration of the o-phthalaldehyde disinfectant.

[0016] Compared with the prior art, the present invention can complete the detection directly at the medical disinfection site through the integrated design of the uniform dripping device and the self-powered liquid sensor, avoid the concentration monitoring lag problem caused by sampling delay, and ensure that the disinfectant concentration is always in the effective range. The design of the droplet of the present invention continuously flows through the top electrode, supports the dynamic tracking of the disinfectant concentration (such as real-time monitoring of concentration decay during immersion disinfection), and can better reflect the concentration change trend in the actual use scenario than the traditional intermittent sampling. The present invention utilizes the charge transfer characteristics when the liquid contacts the electrode. Different concentrations of o-phthalaldehyde solution will produce significantly different voltage signals due to the difference in ion / polar molecule density, so it can effectively distinguish the common clinical concentration differences. The top electrode and bottom electrode of the present invention are both designed with four rectangular electrode arrays. When the droplet passes through multiple electrodes in turn, a sequence voltage signal is generated. The multi-segment signal feature is comprehensively analyzed by a machine learning algorithm (support vector machine SVM), reducing the accidental error of a single electrode and improving the reliability of the test results. The core components of the present invention, such as glass substrate (silicon dioxide), dielectric layer (PDMS), and electrode (gold / platinum / aluminum), are all common industrial materials, and the cost is much lower than that of traditional spectroscopy / chromatography instruments. The uniform dripping device uses a liquid storage tank and a dripping tube made of polytetrafluoroethylene, which are resistant to chemical corrosion and easy to process, and the hardware cost of the entire device is controllable. The self-powered liquid sensor does not require an external power supply and generates detection signals independently only through the frictional electrification effect, avoiding the power dependence and complex circuit maintenance problems of traditional equipment. In addition, the dripping tank is provided with a drain port, which can quickly clean residual liquid and reduce the risk of cross-contamination, making it suitable for frequent use scenarios. The overall device of the present invention can be integrated into a portable detection box, which is convenient for mobile use in scenarios such as operating rooms and disinfection supply centers. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of the uniform dripping device and the self-powered liquid sensor;

[0018] Figure 2 Schematic diagram of the structure of the self-powered liquid sensor;

[0019] Figure 3 A top view of the self-powered liquid sensor of the present invention;

[0020] Figure 4 This is a schematic diagram of the connection between the uniform dripping device and the self-powered liquid sensor;

[0021] Figure 5 This is a schematic diagram of connecting the self-powered liquid sensor to the oscilloscope;

[0022] Figure 6 Schematic diagram of the triboelectric effect;

[0023] Figure 7 Schematic diagram of the detection method of the present invention;

[0024] Figure 8 Schematic diagram of voltage signals generated by o-phthalaldehyde solutions with different concentrations;

[0025] Figure 9 This is a schematic diagram of the intelligent classification results of the machine learning processing module. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] 1. Glass substrate; 2. Bottom electrode; 3. Dielectric layer; 4. Top electrode; 5. Liquid storage tank; 6. Dropper; 7. Air inlet; 8. Dropper tank; 9. Oscilloscope; 201. First electrode; 202. First electrode lead; 203. First signal pin electrode; 401. Second electrode; 402. Second electrode lead; 403. Second signal pin electrode; 501. Sample injection port; 502. Dropper port; 503. Air inlet; 801. Sample dropper port; 802. Liquid discharge port. DETAILED DESCRIPTION

[0028] The specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings, but it should be understood that the scope of protection of the present invention is not limited by the specific embodiments. All other examples in which the components of the embodiments of the present invention described and shown in the drawings are arranged and designed in various different configurations are within the scope of protection.

[0029] Example: A real-time concentration detection device for o-phthalaldehyde disinfectant comprises a uniform dripping device and a self-powered liquid sensor. The uniform dripping device comprises a liquid storage tank 5, a dripping tube 6, an air inlet pipe 7, and a dripping tank 8, while the self-powered liquid sensor comprises a glass substrate 1, a bottom electrode 2, a dielectric layer 3, and a top electrode 4. The following describes the specific structure, operating principle, and operating steps of the present invention in detail, using accompanying drawings and actual application scenarios.

[0030] As attached Figure 1 As shown in the figure, the overall structure of the device consists of two parts: a uniform dripping device and a self-powered liquid sensor. The uniform dripping device is responsible for evenly adding the test solution in the form of droplets to the self-powered liquid sensor, while the self-powered liquid sensor uses the triboelectric effect to generate a voltage signal. This signal is processed by a machine learning algorithm to accurately detect the concentration of the disinfectant.

[0031] Specifically, if Figure 1 and Figure 5As shown, the liquid storage tank 5 is located at the top of the device. It is a rectangular parallelepiped structure with a length of 10 cm, a width of 10 cm, a height of 15 cm, and a wall thickness of 2 mm. The material used is polytetrafluoroethylene. The liquid storage tank 5 has three key interfaces: an injection port 501, a dripping port 502, and an air inlet 503. The injection port 501 has a diameter of 2.5 cm and is connected to a water pump via a pipe for injecting the test solution; the dripping port 502 has a diameter of 3 mm and is equipped with a dripping tube 6, which is used to input droplets into the dripping tank 8; the air inlet 503 has a diameter of 3 mm and is equipped with an air inlet pipe 7 for regulating the air pressure in the liquid storage tank to ensure that the solution can flow out at a constant rate. The dripping tube 6 has an outer diameter of 3 mm, an inner diameter of 2.5 mm, and a length of 5 cm. It is also made of polytetrafluoroethylene and connects the dripping port 502 of the liquid storage tank 5 to the sample droplet 801 of the dripping tank 8. The air inlet pipe 7 has an outer diameter of 3 mm, an inner diameter of 2.5 mm, and a length of 10 cm. Made of polytetrafluoroethylene, it connects the air inlet 503 of the liquid storage tank 5 at one end, while the other end is open to balance air pressure. The dripping tank 8 is a rectangular parallelepiped with the same dimensions as the liquid storage tank 5: 10 cm in length, 10 cm in width, and 15 cm in height, with a wall thickness of 2 mm. Made of polytetrafluoroethylene, the dripping tank 8 is equipped with a sample droplet 801 and a drain port 802. The sample droplet 801 has a diameter of 3 mm and is used to drip solution onto the self-powered liquid sensor in the form of droplets. The drain port 802 has a diameter of 1 cm and is used to drain excess solution or clean residual liquid. The self-powered liquid sensor is tilted in the drip tank 8, with an inclination angle between 60° and 90°.

[0032] As attached Figure 2-5As shown, the core structure of the self-powered liquid sensor includes a glass substrate 1, a bottom electrode 2, a dielectric layer 3, and a top electrode 4. The glass substrate 1 is rectangular, 10 cm long, 8 cm wide, and 3 mm thick. Made of silicon dioxide, it provides mechanical support and electrical insulation. The bottom electrode 2, located on top of the glass substrate 1, comprises four identical rectangular first electrodes 201. Each first electrode 201 is 1 cm long, 0.8 cm wide, and 1 μm thick, and is made of one of gold, platinum, or aluminum. The bottom electrode 2 is connected to a first signal pin electrode 203 at the edge of the device via a first electrode lead 202. The first signal pin electrode 203 is 0.5 cm long and 0.4 cm wide, and is also made of one of gold, platinum, or aluminum. The first signal pin electrode 203 is connected to an oscilloscope 9. The dielectric layer 3, covering the bottom electrode 2, is rectangular, 8 cm long, 6 cm wide, and 4 mm thick. Made of polydimethylsiloxane (PDMS), it enhances the triboelectric effect and provides electrical insulation. The top electrode 4 is located on the dielectric layer 3 and includes four rectangular second electrodes 401 of identical shape. Each second electrode 401 has a length of 0.5 cm, a width of 0.4 cm, and a thickness of 1 μm. The material is one of gold, platinum, or aluminum. The top electrode 4 is connected to the second signal pin electrode 403 at the edge of the device through a second electrode lead 402. The second signal pin electrode 403 has a length of 0.6 cm and a width of 0.5 cm. The material is also one of gold, platinum, or aluminum. The second signal pin electrode 403 is connected to the oscilloscope 9, and the output end of the oscilloscope 9 is connected to the machine learning processing module. Figure 6 As shown in Figure 2, the principle of triboelectric effect is as follows:

[0033] (1) When o-phthalaldehyde disinfectant drips onto the surface of the second electrode 401 of the top electrode 4, the liquid contacts the metal electrode, and electrons are transferred between the liquid (or solute) and the electrode. The mechanism is that the concentrations of o-phthalaldehyde molecules and their dissociated ions in disinfectants of different concentrations vary, resulting in differences in the electron transfer capacity (e.g., ion adsorption and interfacial charge density) between the liquid and the electrode.

[0034] (2) Under the action of gravity, the droplet flows downward along the surface of the top electrode (passing through the four second electrodes from top to bottom in sequence). The area in contact with the electrodes is constantly updated, and the charge separation process continues. The top electrode 4 and the bottom electrode 2 form a capacitor structure through the dielectric layer 3. The charge separation causes a potential difference (voltage signal) between the top and bottom electrodes, which can be measured by connecting the electrode leads to an oscilloscope. The mechanism is that the higher the concentration, the greater the density of ions or polar molecules in the solution, the greater the amount of charge transfer when in contact with the electrodes, resulting in a more significant change in the potential difference.

[0035] Furthermore, if Figure 7 As shown, the detection method of the present invention has the following steps:

[0036] In step S1, the sample inlet 501 of the liquid storage tank 5 is first connected to an external water source, and the solution to be tested is pumped into the liquid storage tank 5 by a water pump. The solution in the liquid storage tank 5 flows into the dripping tank 8 through the dripping pipe 6 under the action of gravity.

[0037] In step S2, in the dripping tank 8, the solution is dripped onto the top electrode 4 of the self-powered liquid sensor in the form of droplets due to the combined effects of gravity and liquid surface tension. The diameter of the dripping port 801 is carefully designed to ensure that the volume of each droplet is consistent, thereby minimizing the impact of droplet volume differences on test results.

[0038] In step S3, the droplet sequentially slides across the four rectangular second electrodes 401 of the top electrode 4, generating a voltage signal due to the triboelectric effect during contact. The top electrode 4 and bottom electrode 2 are connected to the second signal pin electrode 403 and the first signal pin electrode 203 via the second electrode lead 402 and the first electrode lead 202, respectively. The voltage signal is transmitted to an external device for collection and processing.

[0039] In step S4, the oscilloscope measures the voltage signals across the top electrode 4 and the bottom electrode 2 and pre-processes the collected voltage signals. The pre-processing step includes using a linear interpolation method to normalize the waveform data at different concentrations into a time series of equal length.

[0040] In step S5, the machine learning processing module classifies the preprocessed signals using a support vector machine (SVM) classification algorithm and evaluates model performance using a ten-fold cross-validation method. This embodiment evaluates classification accuracy using a confusion matrix, where the elements on the diagonal represent the number of accurately predicted samples.

[0041] In order to further verify the detection effect of the detection device of the present invention, different concentrations of o-phthalaldehyde solution were used for testing. The voltage signals generated by o-phthalaldehyde solutions of different concentrations have significant differences. For example, when the concentration increases by 0.1%, the peak voltage decreases by about 2V. Figure 8 As shown. In this embodiment, the preprocessing step unified the waveform length at each concentration to 0.5s. Subsequently, the support vector machine (SVM) classification algorithm was used to classify the preprocessed signals, and the model performance was evaluated using a ten-fold cross validation method. The experimental results showed that Figure 9 As shown in the figure, when the concentration was 0.3%-0.4%, the classification accuracy was 97.53%; when the concentration was 0.4%-0.5%, the classification accuracy was 95.73%; when the concentration was 0.5%-0.6%, the classification accuracy was 92.59%; when the concentration was 0.6%-0.7%, the classification accuracy was 92.41%; and when the concentration was 0.7%-0.8%, the classification accuracy was 84.93%. The average classification accuracy reached 92.64%.

[0042] It can be seen that the technical effects of the present invention are embodied in the following aspects: First, through the coordinated work of the uniform dripping device and the self-powered liquid sensor, real-time monitoring of the concentration of o-phthalaldehyde disinfectant is achieved. This method does not require professional personnel to take samples for off-site testing, and the test can be completed directly on-site, which significantly improves the detection efficiency. Secondly, based on the triboelectric effect and multi-electrode design, the detection sensitivity of the present invention is significantly improved, and it can distinguish o-phthalaldehyde solutions with a concentration difference of only 0.1%. Thirdly, the sensor material uses materials with good biocompatibility, such as silicon dioxide, PDMS and metal electrodes, which are suitable for medical environments. Finally, the device has a simple structure and is easy to maintain. Compared with traditional laboratory testing equipment, it has obvious cost advantages and is suitable for promotion and use in primary medical institutions.

[0043] In summary, the present invention provides a real-time concentration detection device and method for o-phthalaldehyde disinfectant based on triboelectric charging technology, which solves the problems of complex detection, high cost, and inability to achieve real-time monitoring in the existing technology, and provides important technical support for the development of the medical disinfection industry.

Claims

1. A real-time concentration detection device for o-phthalaldehyde disinfectant, characterized in that: The invention comprises a uniform liquid dripping device and a self-powered liquid sensor; the self-powered liquid sensor comprises a glass substrate (1), a bottom electrode (2) is arranged on the glass substrate (1), a dielectric layer (3) is arranged on the bottom electrode (2), and a top electrode (4) is arranged on the dielectric layer (3); a dripping port of the uniform liquid dripping device is arranged above the top electrode (4) to achieve uniform dripping of o-phthalaldehyde disinfectant and flow through the top electrode (4) from top to bottom; the top electrode (4) and the bottom electrode (2) are connected to an oscilloscope via signal pin electrodes, and the output end of the oscilloscope is connected to a machine learning processing module.

2. The real-time concentration detection device for o-phthalaldehyde disinfectant according to claim 1, wherein: The uniform dripping device comprises a liquid storage tank (5), a dripping tube (6), an air inlet pipe (7) and a dripping tank (8); the liquid storage tank (5) is connected to the dripping tank (8) via the dripping tube (6); the self-powered liquid sensor is arranged obliquely in the dripping tank (8), and the dripping port of the dripping tube (6) faces the top electrode (4) of the self-powered liquid sensor.

3. The real-time concentration detection device for o-phthalaldehyde disinfectant according to claim 2, wherein: The liquid storage tank (5) is a rectangular parallelepiped structure with a length of 10 cm, a width of 10 cm, a height of 15 cm, a wall thickness of 2 mm, and is made of polytetrafluoroethylene; the liquid storage tank (5) is provided with an injection port (501), a dripping port (502), and an air inlet (503), wherein the diameter of the injection port (501) is 2.5 cm, the diameter of the dripping port (502) is 3 mm, and the diameter of the air inlet (503) is 3 mm.

4. The real-time concentration detection device for o-phthalaldehyde disinfectant according to claim 2, wherein: The dropper (6) has an outer diameter of 3 mm, an inner diameter of 2.5 mm, a length of 5 cm, and is made of polytetrafluoroethylene; the air inlet pipe (7) has an outer diameter of 3 mm, an inner diameter of 2.5 mm, a length of 10 cm, and is made of polytetrafluoroethylene.

5. The real-time concentration detection device for o-phthalaldehyde disinfectant according to claim 2, characterized in that: The dripping tank (8) is a rectangular parallelepiped structure with a length of 10 cm, a width of 10 cm, a height of 15 cm, a wall thickness of 2 mm, and is made of polytetrafluoroethylene. The dripping tank (8) is provided with a dripping port (801) and a liquid discharge port (802), wherein the diameter of the dripping port (801) is 3 mm, and the diameter of the liquid discharge port (802) is 1 cm.

6. The real-time concentration detection device for o-phthalaldehyde disinfectant according to claim 1, characterized in that: The glass substrate (1) is rectangular, 10 cm long, 8 cm wide, and 3 mm thick, and is made of silicon dioxide.

7. The real-time concentration detection device for o-phthalaldehyde disinfectant according to claim 1, characterized in that: The bottom electrode (2) comprises four first electrodes (201) of the same rectangular shape; the bottom electrode (2) is connected to a first signal pin electrode (203) at the edge of the device via a first electrode lead (202); the first signal pin electrode (203) is connected to an oscilloscope; the first electrode (201) has a thickness of 1 μm, a length of 1 cm, a width of 0.8 cm, and is made of one of gold, platinum, or aluminum.

8. The real-time concentration detection device for o-phthalaldehyde disinfectant according to claim 1, characterized in that: The dielectric layer (3) is rectangular, 8 cm in length, 6 cm in width, and 4 mm in thickness, and is made of PDMS.

9. The real-time concentration detection device for o-phthalaldehyde disinfectant according to claim 1, characterized in that: The top electrode (4) comprises four second electrodes (401) of the same rectangular shape. The top electrode (4) is connected to a second signal pin electrode (403) via a second electrode lead (402). The second signal pin electrode (403) is connected to an oscilloscope. The second electrode (401) has a length of 0.5 cm, a width of 0.4 cm, and a thickness of 1 μm, and is made of one of gold, platinum, or aluminum.

10. The detection method of the real-time concentration detection device for o-phthalaldehyde disinfectant according to any one of claims 1 to 9, characterized in that: A uniform dripping device is used to add o-phthalaldehyde disinfectant in the form of droplets onto the self-powered liquid sensor, and the droplets flow through the top electrode from top to bottom. When the droplets flow through the top electrode, a voltage signal is generated by the triboelectric effect. The voltage signal is then measured using an oscilloscope and input into a machine learning processing module. The characteristics of different voltage signals are analyzed by the machine learning processing module to determine the concentration of the o-phthalaldehyde disinfectant.

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