59 results about "Electrode impedance" patented technology

The invention relates to the technical field of electroencephalogram signal processing, and provides a brain-computer AI glasses electroencephalogram signal multi-dimensional quality dynamic detection method, which comprises the following steps: preprocessing collected electroencephalogram signals; performing task frequency band component analysis on the channel signals subjected to the matrix rank analysis, and calculating a power proportion of a target frequency band; performing maximum gradient analysis on the channel signal, and calculating the maximum gradient value of the channel signal; performing root-mean-square analysis on the channel signal, and calculating a root-mean-square value of the channel signal; performing fluctuation amplitude analysis on the channel signal, and calculating a peak-to-peak value of the channel signal; performing brain hemisphere symmetry analysis on the left and right homologous channel signals, calculating the correlation and mean square error of the channel signals, and setting a dynamic threshold according to the frequency band of the channel signals; obtaining an electrode impedance value, and mapping the electrode impedance value into an impedance score through a preset exponential attenuation function; the final quality score of the channel is obtained, and dynamic detection and real-time score updating of the electroencephalogram signal quality are achieved.

The invention provides a high-capacity silicon-carbon composite negative electrode material and a preparation method thereof, and relates to the technical field of battery materials, the high-capacity silicon-carbon composite negative electrode material comprises the following components by mass: 20-50 parts of silicon-based particles, 3-8 parts of an interface modification layer, and 45-75 parts of a carbon matrix; the silicon-based particles are nano silicon; the interface modification layer is oxide or nitride and coats the surfaces of the silicon-based particles; the carbon substrate is prepared from 20 to 40 parts of graphite, 15 to 25 parts of amorphous carbon and 5 to 10 parts of carbon nanotubes; through the three-layer structure of the silicon-based particles, the interface modification layer and the carbon substrate, the cooperation of high capacity and high stability is realized, and the nano silicon-based particles give full play to the advantage of high capacity, so that the first discharge specific capacity of the material is higher; the interface modification layer reduces interface impedance of silicon and carbon and inhibits side reaction of silicon and electrolyte; the three-dimensional network of the carbon matrix not only reduces the electrode impedance, but also provides buffering for silicon volume expansion, and is obviously superior to the traditional graphite and the existing silicon-carbon negative electrode.

The invention discloses a fatigue driving intervention method and system based on head electric pulse stimulation, and relates to the technical field of fatigue driving intervention, and the method comprises the steps: collecting the scalp micro-motion frequency and scalp-electrode impedance change of a driver through a head-mounted sensing device, and obtaining an original physiological state signal; calculating a current fatigue index according to the original physiological state signal, wherein the reduction of scalp micro-motion frequency and the increase of impedance fluctuation amplitude respectively correspond to the increase of fatigue degree and the aggravation of attention distraction; continuously comparing the fatigue index with a dynamically adjusted physiological threshold, and when the fatigue index exceeds the physiological threshold and maintains a preset duration, generating a first intervention triggering condition; and whether a second intervention triggering condition or a third intervention triggering condition is generated or not is judged by combining an intervention mode preset by a user, the continuous running time of the vehicle and a manual triggering instruction, and an intervention enabling signal is output based on the logic relation of the first intervention triggering condition, the second intervention triggering condition and the third intervention triggering condition.

This invention discloses a flexible multichannel multilayer electrode, its fabrication method, and an electromyography (EMG) signal acquisition device. The fabrication method of the flexible multichannel multilayer electrode includes the following steps: etching and cleaning a silicon wafer; preparing an AgNW / NG solution as a conductive material and using SEBS powder to prepare an elastic substrate; fabricating a signal acquisition layer using the silicon wafer, conductive material, and SEBS powder; fabricating a wire shielding layer using the silicon wafer and SEBS powder; and fabricating an encapsulation layer and an interference signal shielding layer using the silicon wafer, conductive material, and SEBS powder; assembling the encapsulation layer, interference signal shielding layer, signal acquisition layer, and wire shielding layer sequentially from top to bottom, and connecting the signal acquisition layer to a flexible printed circuit board. This invention aims to solve the problems of high electrode impedance, low signal-to-noise ratio, and poor tensile strength of multichannel electrodes.

The invention discloses an integrated impedance measurement system adaptive to a biological signal acquisition front end. The integrated impedance measurement system comprises a sine wave current generator, a band-pass filter, an amplifier module BPFA, a multiplexer and an analog-to-digital converter ADC which are communicated in sequence, the sine wave current generator is used for generating low-amplitude alternating current for measuring tissue-electrode impedance, and the alternating current acts on a measured electrode to generate corresponding alternating voltage; the band-pass filter and amplifier module BPFA is used for amplifying and filtering the AC voltage; an analog-to-digital converter (ADC) receives the amplified and filtered alternating voltage through a multiplexer to perform digital signal conversion, and tissue-electrode impedance measurement of the measured electrode acting on the tissue is completed; according to the invention, the amplitude of the AC voltage is controlled to accurately adapt to the + / -5mV input range of the existing acquisition front end, and the amplification and filtering modules are directly multiplexed to complete impedance signal processing without additionally configuring a special analog front end for impedance measurement, so that the integration level and the stability of a chip are improved.

The invention provides a bio-electricity signal and electrode impedance acquisition system and method, and relates to the technical field of bio-electricity signal acquisition and processing. According to the specific technical scheme, the integrated bio-electricity signal acquisition chip is used for generating an alternating current excitation signal with a specific frequency and a fixed amplitude through an internally integrated excitation source; continuously applying an alternating current excitation signal to one or more target electrodes through an internal analog switch array; the integrated bio-electricity signal acquisition chip is used for acquiring a mixed digital signal from a target electrode, and the mixed digital signal is formed by superposing a bio-electricity signal, a noise signal and an impedance response signal generated by an alternating current excitation signal on target electrode impedance; and the microcontroller unit is used for extracting electrode impedance information from the mixed digital signal and recovering the bio-electricity signal.

The application provides a kind of early warning system and method of radial artery compression hemostat based on multiple sensors, belongs to complication early warning technical field.The method comprises the following steps: S1, multiple types of physiological signals in the radial artery compression area are synchronously collected and digitized;S2, the temperature at the proximal end and the temperature at the distal end are subjected to discrete wavelet transform;the pulse signal is subjected to time domain analysis, and the pulse amplitude is extracted;S3, a temperature distribution model of the compression area is constructed based on the temperature difference signal;S4, the resistivity distribution of the compression area is reconstructed through the electrode impedance signal, and the bleeding position is located;S5, the pressure change rate is calculated based on the pressure digital signal;the pulse amplitude attenuation rate is calculated based on the pulse amplitude;the pressure change rate, the temperature gradient vector, the pulse amplitude attenuation rate and the bleeding index are fused through a weighted summation formula, and a comprehensive risk value is obtained.The application improves the complication-related parameter coverage rate through multiple sensors, and improves the timeliness and accuracy of complication early warning.

The invention discloses a pole piece, a battery and electric equipment, the pole piece comprises a pole piece main body and at least one tab connected with the pole piece main body, the pole piece main body comprises a current collector and an active material coated on the surface of the current collector, the pole piece main body comprises at least two areas in a first direction, and the active materials coated on the at least two areas are different; the at least two regions include a distal region distal from the tab, the active material of the distal region including secondary particles, where the secondary particles are formed from a plurality of primary particles. According to the pole piece, the battery and the electric equipment provided by the invention, the electrode pole piece led out from the same side of the tab is divided into at least two regions, the at least two regions comprise the far-end region far away from the tab, and the active material of the far-end region comprises the secondary particles formed by the primary particles; the problem of uneven distribution of current density and electrode impedance of the side close to the tab and the side far away from the tab in the electrode led out from the same side of the tab can be solved, so that the electrochemical performance of the electrode is improved.

A method for optimizing stimulation for a patient having a stimulator device, such as a deep brain stimulation (DBS) device, is disclosed that involves taking into account tissue imaging information in the environment around a lead. Test stimulation is provided at initial combinations of lead position and stimulation parameters, such as amplitude values, wherein the patient is scored for each combination. One or more objective criteria are measured and scored. The objective criteria may be electrode impedance and / or pressure indicators, such as cardiac signals. The process is iteratively repeated until a stop criterion is met. The lead position in question may be a longitudinal or rotational position about the lead, and if the lead is essentially oriented, preferably both.

Information from sense channels connected to multiple electrodes, in addition to information from a sense channel connected to a single electrode, provides additional functionality to the connected device. [Solution] The computer implementation method includes measuring a first electrode impedance signal associated with a first electrode using a first sense channel. The method further includes measuring a second electrode impedance signal associated with at least a second electrode and a third electrode using a second sense channel, wherein the second and third electrodes are electrically connected to each other but not to the first electrode. The method further evaluates tissue contact / proximity based on the first electrode impedance signal and the second electrode impedance signal.

The invention relates to the technical field of coating performance testing, and discloses a coating rheological property testing method based on a micro-fluidic chip, which comprises the following steps: providing the micro-fluidic chip on which a shear failure area and a dynamic evolution observation area which are communicated in sequence are integrated, an on-way programmable micro heater, a micro acoustic transducer and a microelectrode impedance spectroscopy array are cooperatively integrated in the dynamic evolution observation area; driving the coating sample to flow through the area at a preset volume flow rate; when a sample flows through the dynamic evolution observation area, acoustic signals and electrical impedance spectroscopy signals at different positions are synchronously collected. Through correlation analysis of evolution of the two characteristic parameters along with time and temperature, the technical problems that a real high-shear working condition cannot be simulated and multi-dimensional in-situ characterization is difficult to perform in the prior art are solved, and trace, rapid and high-resolution dynamic monitoring of the coating structure recovery process is realized.

Embodiments disclosed include an electrosurgical system as well as a method. The electrosurgical system and the method (are configured to determine an electrode type (T1, T2, T3) of a neutral electrode by applying an alternating measurement signal to the neutral electrode at least at two different measurement frequencies (f1, f2). At each measurement frequency (f1, f2) an impedance absolute value (ZNabs) or a phase value (φ) or both is determined for the neutral electrode impedance (ZN) of neutral electrode. When at least one impedance absolute value (ZNabs) and at least one phase value (φ) is determined, and based on the at least one impedance absolute value (ZNabs) and the at least one phase value (φ), the electrode type (T1, T2, T3) of the connected neutral electrode is determined by comparison with known comparison values for the at least one impedance absolute value (ZNabs) and the at least one phase value (φ).

A battery cell, a battery, an electrical apparatus, and a battery cell core, belonging to the technical field of batteries. When the length-width ratio m of a positive electrode sheet satisfies 1 ≤m≤6 and the compaction density ρ of a positive electrode active material layer satisfies 3.3 g / cm3≤ρ≤3.7 g / cm3, the mass ratio of single-crystal particles of the positive electrode active material is controlled to be no less than 50%, and the porosity of the positive electrode active material layer is controlled to be 23% to 33%. Since single-crystal particles are less prone to fracture during cold pressing and long-term charging / discharging processes, excessive active specific surface area is not exposed compared to polycrystalline particles, thereby reducing side reactions with an electrolyte and reducing the increase of positive electrode impedance in a battery. Moreover, the occurrence of the situation in which an effective conductive network cannot be established at a new interface due to material particle fracture is reduced, so that the phenomenon of local potential increase caused by a particle "island" formed by the positive electrode active material is prevented, thereby achieving mitigation of the DCR in a battery cell core and mitigation of the electrode sheet resistance of a high-energy-density battery cell core.

The application discloses a nerve microelectrode with long-term biocompatibility maintenance and a preparation method thereof. Most of the existing nerve electrodes have only a few recording points, so that the spatial resolution is low; the flexible electrode implantation has a large width, so that more trauma areas are caused. The nerve microelectrode with long-term biocompatibility maintenance for nerve recording comprises a recording layer, an electrochemical modification layer and a biocompatibility coating. The preparation of the biocompatibility polypeptide coating is realized by adopting a MEMS compatible PVD technology, so that the preparation efficiency and consistency of the electrode are greatly improved. The biocompatibility coating which completely covers the electrode points and the whole probe surface has a special porous nanofiber structure and can realize ion conduction. The electrode point recording performance is improved by using the electrochemical modification layer, so that the biocompatibility is improved without seriously affecting the electrode impedance and recording capacity.

The invention provides a negative electrode plate and a secondary battery thereof, the negative electrode plate comprises a negative electrode current collector and a negative electrode active material layer, and the negative electrode active material layer is arranged on at least one side surface of the current collector; the negative electrode active material layer comprises a negative electrode active material, and the negative electrode active material comprises at least one of a carbon material, a silicon carbon material and a silicon material; the negative electrode active material is low-hardness particles or high-hardness particles, the low-hardness particles meet the condition that (T-Z) / G is smaller than or equal to 0.4, and the high-hardness particles meet the condition that (T-Z) / G is larger than 0.4; the compaction density P of the negative electrode active material layer meets the following relational expression: < = < =; 0.9 g / cm < 3 > < = T < = 2.0 g / cm < 3 >, 0.8 g / cm < 3 > < = P < = 2.0 g / cm < 3 >, 0.8 g / cm < 3 > < = Z < = 1.2 g / cm < 3 >, and 1.4 g / cm < 3 > < = G < = 2.4 g The negative electrode plate provided by the invention has good electron and ion migration channels and low impedance, the cycle performance and rate capability of the battery are improved, and the cycle stability of the battery is improved.

The invention relates to an intelligent microbial electrode impedance analysis device, which belongs to the technical field of electrochemical impedance spectroscopy analysis, and comprises a three-electrode system used for collecting microbial impedance signals; the response signal acquisition and conditioning module is used for preprocessing the acquired microbial impedance signal; the self-adaptive digital phase-locked amplification module adopts a synchronous orthogonal digital demodulation technology and utilizes known excitation signal digital phase information to generate an orthogonal reference signal, extract amplitude and phase information of an impedance response signal, perform self-adaptive noise suppression and decouple core parameters; the reinforcement learning optimization unit is used for evaluating a current measurement state and selecting a next frequency step length; the self-adaptive excitation module is used for generating a sine excitation voltage signal and outputting the sine excitation voltage signal to the three-electrode system; and the data display module is used for displaying the impedance spectrum and the Rct curve.

The invention provides a pulse field ablation evaluation method and system based on impedance change and a related product, objective quantitative evaluation of a catheter attaching state is realized through impedance measurement, and dependence on experience of an operator is reduced; the electrode space state is deduced based on multi-electrode impedance distribution, and a basis is provided for multi-electrode discharge mode selection; electrical evaluation of the ablation effect is realized through impedance change analysis before and after ablation; the system does not depend on an external three-dimensional mapping or image system, the system structure is simplified, and the applicability is high; the device can be compatible with an existing pulse field ablation host and catheter structure, and engineering implementation is facilitated.

The application discloses an integrated filtering and ozone disinfection double-mode water tank water outlet device, which comprises a base, a inner sleeve fixed in the base, an ozone generator fixed in the inner sleeve, a shell fixedly connected to the top of the inner sleeve, a filter element arranged in the shell, a cover covering the shell, a threaded sleeve extending upwards and downwards and fixed to the lower end of the base, and a water inlet pipe and a water outlet pipe both extending upwards and downwards and penetrating through the threaded sleeve. The water tank water outlet device can be directly installed in the original washing liquid hole of the water tank, realizes the integration of filtering and ozone disinfection double functions without changing the original cold and hot water faucet layout, the metal-based BDD electrode has extremely small resistance, which is beneficial to reducing the overall electrode impedance, the metal-based BDD electrode has a stable passivation layer and can keep low background current for a long time, and the metal-based BDD electrode has a wide current use range and can perform long-term and high-efficiency electro-oxidation reaction.

The invention discloses a dry electrode automatic pressure adjusting device of a whole-brain multi-channel bioelectricity acquisition system, and relates to the technical field of x-brain external equipment. The dry electrode automatic pressure adjusting device of the whole-brain multichannel bioelectricity acquisition system comprises an external controller, a connecting pipe and a head-mounted device, and the external controller is connected with the head-mounted device through the connecting pipe. The pressure guarantee is enhanced for the depression-related frontal lobe region through the air bag grouping structure; pneumatic worst electrode impedance priority control is carried out, and effective contact of all electrodes is ensured by taking the optimal impedance of the electrodes in the areas as an adjusting reference; the symptoms of insomnia, anxiety and fatigue are treated according to the principle that controllable pressure is used for massaging and stimulating scalp; the TPU honeycomb bracket and the buffer air cavity solve the problem of collapse of the equipment when the equipment is not inflated; only the air bag and the pressure sensor are worn on the head, which is light and convenient and low in cost.

The application discloses a semiconductor process equipment, and relates to the semiconductor field. The semiconductor process equipment comprises a process chamber, a first radio frequency feeding piece, a second radio frequency feeding piece, a first matching device and an impedance adjustable device. The process chamber comprises a cavity and a bearing device. One end of the first radio frequency feeding piece penetrates into the cavity and is connected with the bearing device. The other end of the first radio frequency feeding piece penetrates into the impedance adjustable device. One end of the second radio frequency feeding piece penetrates into the impedance adjustable device and is slidably connected with the other end of the first radio frequency feeding piece. The other end of the second radio frequency feeding piece is connected with the first matching device. The impedance adjustable device is connected between the first matching device and the cavity, and is used for adjusting the distance between the first matching device and the cavity, so as to adjust the impedance of a lower electrode in the semiconductor process equipment. The application can solve the problem of poor lower electrode impedance adjustment in the prior art.

The application relates to the technical field of electroencephalogram signal processing, and provides a multi-dimensional quality dynamic detection method for electroencephalogram signals of brain-computer AI glasses, which comprises the following steps: preprocessing collected electroencephalogram signals; performing task frequency band component analysis on channel signals through matrix rank analysis, calculating the power proportion of a target frequency band; performing maximum gradient analysis on the channel signals, calculating the maximum gradient value of the channel signals; performing root mean square analysis on the channel signals, calculating the root mean square value of the channel signals; performing fluctuation amplitude analysis on the channel signals, calculating the peak-to-peak value of the channel signals; performing brain hemisphere symmetry analysis on left-right homologous channel signals, calculating the correlation and mean square error of the channel signals, and setting a dynamic threshold value according to the frequency band of the channel signals; obtaining an electrode impedance value, mapping the electrode impedance value into an impedance score through a preset exponential decay function; and obtaining a final quality score of the channel, so that dynamic detection and real-time score updating of the electroencephalogram signal quality are realized.

The invention discloses a corn kernel invisible damage four-electrode impedance online detection and sorting device and method based on single granulation and self-adaptive positioning. The device comprises a feeding unit, a multi-column conveying unit, a parallel detection unit and a synchronous sorting unit. The feeding unit realizes ordered arrangement and single-row output of grains through shunting and directional shaking; the plurality of rows of conveying units synchronously complete posture correction and distribution uniformity improvement of the grains based on the U-shaped sliding groove design; the parallel detection unit forms passive self-adaptive positioning and stable electric contact with circumferential arc electrode lobes / insulation lobes through a spherical crown insulation core column, a control system dynamically selects four arc electrode lobes from six electrode lobes to implement four-electrode impedance spectroscopy measurement, characteristic parameters are extracted, and damage is judged; and the damaged grains are blown into a defective product container at the sorting point according to a delay trigger nozzle. The method realizes real-time, lossless and high-precision detection of the invisible damage of the corn kernels, and has the comprehensive advantages of high throughput and high efficiency.

The invention relates to an electrophysiological electrode impedance measuring device which comprises at least three electrodes, an alternating current source, a switching mechanism, an analog-to-digital converter and a microprocessor, and the microprocessor is connected with the analog-to-digital converter, the alternating current source and the switching mechanism. The invention discloses a method for testing electrode skin impedance of each electrode. A microprocessor controls an alternating current source to provide alternating current; the switching mechanism couples an alternating current source to any two electrodes and calculates an impedance value between the two electrodes; further calculating an impedance value between the other at least two groups of electrodes; and finally, respectively calculating the electrode skin impedance of different electrodes by combining the at least three groups of impedance values with an equivalent impedance model. The method has the advantages that many electric signal errors in an electric signal measuring system are corrected and corrected by accurately measuring the electrode skin impedance value of each electrode, so that the safety and misjudgment risks possibly occurring in treatment or diagnosis are reduced, and a safer and more effective scheme is provided for a patient.

This invention discloses a method for monitoring the symmetrical internal resistance of electrode sheets to assess battery cell performance, relating to the field of battery technology. The method is used to test the symmetrical internal resistance of electrode sheets after rolling. The process includes sequentially coating, drying, rolling, and die-cutting electrode sheets to prepare electrodes for stacked battery cells. Each electrode sheet includes tabs extending from a current collector. The electrode sheets and separator are placed in a preset dry environment and immersed in electrolyte for a preset time. The electrode sheets and separator are alternately stacked to form an electrode assembly. The electrode assembly is flattened. Probes are then used to contact the tabs of two adjacent electrode sheets to measure and obtain the resistance between the electrode sheets. The method provided by this invention can quickly and accurately detect the symmetrical internal resistance of electrode sheets after rolling and before cell assembly, enabling early identification of abnormal electrode impedance, effectively avoiding the risk of batch battery scrap, and reducing production costs. Simultaneously, it can provide data support for optimizing coating processes, improving cell consistency and product reliability.

The invention discloses a system and a method for removing motion artifacts based on scalp-electrode impedance detection and adjustment, and belongs to the technical field of biomedical engineering. The system comprises an electroencephalogram (EEG) acquisition module, a scalp-electrode impedance detection module, a core processing module and a self-adaptive filtering module, the method comprises the steps that original electroencephalogram signals and scalp-electrode dynamic impedance signals are synchronously collected, the impedance signals are preprocessed through zero adjustment calibration, signal conditioning and sampling rate self-adaptive adjustment, nonlinear mapping and time shift compensation are conducted on the impedance signals through a field programmable gate array (FPGA), then the processed impedance signals serve as reference input, and the scalp-electrode dynamic impedance signals are obtained. And adopting a normalized least mean square (NLMS) algorithm to construct an adaptive filter to remove motion artifacts. The method starts from the root of motion artifacts, artifact removal is more thorough, power consumption is reduced through sampling rate self-adaptive adjustment, real-time processing is guaranteed through an FPGA, a large amount of training data is not needed, and the method is suitable for portable and long-time electroencephalogram monitoring scenes.

The invention discloses a voltage-sharing electrode impedance measuring and scaling degree judging method, and belongs to the field of voltage-sharing electrode state monitoring of a converter valve cooling system of a high-voltage direct-current transmission system. According to the method, a four-probe difference method is adopted to separate current injection and voltage detection channels, and contact resistance interference is eliminated; the capacitance of the double electric layers is obtained through fitting of a chronoamperometer method and an alternating current impedance spectrum; introducing a temperature and conductivity double-compensation model to correct environmental fluctuation; and establishing a multi-parameter joint discrimination rule of standardized impedance, double-layer capacitance and conduction current. Microohm-level impedance change identification is realized, environmental interference and scaling are effectively distinguished, submillimeter-level initial scaling is stably identified, the state identification accuracy rate reaches 96% or above, online monitoring can be carried out without stopping a converter station, the detection reliability is remarkably improved, and support is provided for safe operation of the converter valve.

The application discloses a shock wave generator, an energy control method and a medical instrument system, comprising collecting current and voltage during the discharge process of the shock wave generator, calculating the current resistance value Rp1 of the discharge gap through an equivalent circuit, calculating the predicted resistance value Rp2 of the discharge gap in the leading period through an energy prediction model, taking the preset shock wave energy Ew as a target value, calculating the energy conversion efficiency correction coefficient η, generating a voltage adjustment strategy for maintaining constant energy, combining the real-time measurement of the discharge impedance with the impedance prediction of the leading period, dynamically calculating and adjusting the charging voltage, realizing the closed-loop control of maintaining constant shock wave energy when the electrode impedance changes with use, and maintaining constant shock wave energy under the condition of electrode impedance drift, so as to balance the treatment consistency and equipment durability.

A method is provided for measuring the impedance of a pH sensor electrode. The method includes applying a positive voltage pulse to the pH electrode and taking a plurality of samples of the sensor voltage response and, from those samples, estimating the impedance of the sensor electrode. Then, a negative voltage pulse width is dynamically adjusted to cancel out the induced charges from the positive voltage on the pH sensor so that the sensor quickly recovers to read subsequent media pH levels.

This utility model discloses an electrode attachment device for a portable fish freshness detector, belonging to the field of marine resource monitoring technology. It includes an attachment module and an electrode module. The attachment module adopts a cylindrical structure with protrusions and is covered by an outer sleeve. Buffer adjustment is achieved through the cooperation of the protrusions and damping blocks. The electrode module is fixed to the attachment module via a threaded connection and can integrate multiple sensors such as pH-sensitive electrodes and impedance measurement electrodes. The electrode module adopts a composite probe design, including a micro-puncture section and a contact sensing section, and is equipped with a pressure sensor. Multiple electrodes can be arranged in parallel or concentric arrays, with spacing adjusted using a magnetic slider adjustment mechanism. This utility model's electrode attachment device has functions such as buffer protection, multi-parameter detection, and pressure monitoring, and can adapt to different fish detection needs, significantly improving the accuracy and convenience of fish freshness detection.

The invention belongs to the technical field of system control, and particularly relates to a glass pH electrode impedance measurement method based on a recursive least square method. Comprising the following steps: step 1, modeling an equivalent circuit; 2, performing multi-frequency sine excitation and data acquisition; 3, carrying out model discretization and ARX modeling; and step 4, realizing a recursive least square method. The method has the beneficial effects that in combination with simulation model data and an identification result, when the impedance R of the electrode drifts slowly due to pollution or temperature change, the algorithm can dynamically adjust the historical data weight by setting forgetting factors lambda of different sizes. If the liquid junction potential abrupt change introduces step noise, the regularization and deviation compensation mechanism can inhibit parameter estimation jump, and the steady-state error is effectively reduced. High-dimensional matrix operation is converted into scalar operation, and the bottleneck that a traditional method is complex in calculation and cannot be applied online is solved. Therefore, the RLS algorithm can track the dynamic change of the electrode impedance in real time, and a core support of an algorithm level is provided for on-line monitoring of the glass electrode.