11 results about "Salinity measurement" patented technology

The invention relates to the technical field of seawater salinity monitoring, and discloses a float-type fiber grating salinity sensor and a measuring method.The float-type fiber grating salinity sensor comprises an outer cylinder which is of a hollow structure, the outer cylinder is vertically immersed in a water body to be measured, and a float body is arranged in the outer cylinder; one end of the grating protection cylinder is in threaded connection with the front end of the outer cylinder, the other end of the grating protection cylinder is in threaded connection with a wire outlet seat, a wire pressing terminal is arranged in the middle of the wire outlet seat, and one end of the wire pressing terminal is connected with an external lead; the fiber bragg grating is arranged in the grating protection cylinder, one end of the fiber bragg grating is fixedly connected to the front end of the buoy body, the other end of the fiber bragg grating is connected with the line pressing terminal, when an external to-be-detected water body enters the outer cylinder, the buoy body moves in the outer cylinder under the buoyancy of the to-be-detected water body, and the fiber bragg grating is stretched when the buoy body moves. According to the invention, high-precision, high-stability and anti-interference direct salinity measurement can be realized, and accurate and stable long-term online monitoring is realized.

The application belongs to the technical field of sensing, and relates to a salinity sensing device for deep-sea measurement occasions, which comprises a laser, an attenuator, an optical beam splitter, a gas absorption cell, an FP standard device, a detector, a circulator, a sensing probe, an analog-digital conversion module, an industrial computer and a control module, and each component is electrically connected to form an integrated structure; the current control module with the labview program installed in the industrial computer enables the laser to continuously output regular light signals for sweep frequency; the light signals are decomposed into three light beams by the optical beam splitter after passing through the attenuator, and the sinusoidal signals are obtained at the two-port salinity MZ detection path of the salinity sensing probe; the three signals received by the detector are converted by the analog-digital conversion module and then returned to the industrial computer for demodulation, and then the salinity measurement is realized by returning the laser through the voltage output, current control and temperature control modules; the device has the advantages of simple structure, mature process, high resolution, large range and friendly application environment.

The present invention discloses an optical fiber ocean temperature, salinity, and depth multi-parameter integrated sensor based on cumulative optical fiber length sensitization. The sensor is characterized in that it comprises a hatch cover module, a depth measurement module, a temperature module measurement block, and a salinity measurement module, which are sequentially connected by single-mode optical fibers along the direction from signal input to signal output; the hatch cover module comprises a sensor top cover and an optical fiber hatch connector; the depth measurement module comprises an inner protective shell, a depth-sensitive optical fiber ring, a depth transducer disc, and seawater; the temperature measurement module comprises thermal oil, a temperature-sensitive optical fiber ring, and a temperature transducer core shaft; and the salinity measurement module comprises an outer protective shell, an outer hollow structure, a salt-sensitive optical fiber structure, and an inner core shaft structure. The present invention has the beneficial effects of establishing a temperature, salinity, and depth sensing model in which "one optical fiber measures multiple parameters," thereby solving the problems of low versatility, low sampling rate, low integration, and poor long-term stability of temperature, salinity, and depth meters.

The invention discloses a method, a device, equipment, a medium and a product for determining an effective threshold value of salinity of a marine site, and relates to the field of marine observation.The method comprises the steps that salinity measurement data of the marine site in multiple years are acquired; calculating a daily position mean value and a daily standard deviation according to the salinity measurement data of the ocean site in multiple years; calculating an annual average minimum value, an annual average maximum value and an annual standard deviation according to the daily position mean value and the daily standard deviation; determining the effective change range of the salinity of each year according to the annual average minimum value, the annual average maximum value and the annual standard deviation; and determining a salinity wave band effective range threshold according to the salinity effective change range of each year, and further monitoring the state of observation equipment of the ocean site based on the salinity wave band effective range threshold. The precision of the effective range threshold value of the salinity wave band of the ocean site is improved, the salinity measurement data deviation caused by faults or abnormities of equipment can be found in time, and the reliability and effectiveness of observation data are guaranteed.

An embodiment of the present application provides a salinity measurement method. The method utilizes the characteristic that strain in an optical frequency domain reflectometer system causes changes in the collected signal. The method obtains the signal of a first optical fiber not immersed in a target area and the signal of the first optical fiber after immersion in the target area, and establishes a relationship between the signal change of the first optical fiber and the strain of the first optical fiber. Based on the correspondence between shape and salinity, a correspondence between the signal change and the salinity is then established. By obtaining the signal change of the first optical fiber at each position immersed in the area to be detected, the salinity of each position of the first optical fiber immersed in the area to be detected can be obtained. The signal change of the first optical fiber at each position immersed in the area to be detected can be obtained all at once, reducing the time spent on obtaining salinity and improving the efficiency of salinity detection.

This invention relates to the field of marine environmental air salinity monitoring technology. Currently, most commonly used salinity measurement technologies and methods are limited to measuring salinity in water. These methods involve complex optical path calculations and calibrations, which cannot meet the monitoring needs of marine operational equipment and outdoor facilities in coastal areas. This invention provides a portable marine environmental air salinity detection device and method. The device dissolves the salt in water vapor in the air into the water of a humidifier. A temperature sensor is used to compensate for the conductivity of the mixture. The air salinity is obtained by measuring the conductivity of the electrodes immersed in the mixture. The measurement method is based on conductivity and does not need to consider the influence of external environmental factors such as vibration and angle during use. It can be used in continuous motion, is not limited by space, has strong anti-interference ability, and is suitable for marine environmental monitoring in complex climates.

The application discloses a kind of F-P cascade optical fiber sensor and method for measuring seawater temperature and salt, by a kind of F-P cascade optical fiber sensing structure for measuring seawater temperature and salt and demodulator, optical fiber sensing structure and demodulator are connected by single-mode optical fiber, and optical fiber sensing structure is composed of temperature sensing cavity and salinity sensing cavity cascade;Temperature sensing cavity and salinity sensing cavity are isolated by temperature-sensitive material film;The sensing structure designed in the application combines capillary quartz tube and temperature-sensitive material, greatly improves temperature measurement sensitivity;At the same time, based on the principle of temperature compensation, the application realizes the correction to salinity measurement using F-P cascade structure, improves the precision of salinity measurement;The application has simple structure, low manufacturing cost, high precision, and is an effective means to realize high-precision measurement of seawater temperature and salinity.

The invention relates to the technical field of ocean hydrology prediction, in particular to a salt tide probability forecasting method and device based on physical scene adaptive driving, and the method comprises the steps: obtaining a salinity actual measurement result, physical scene condition data, and a salinity prediction result of a numerical model and a deep learning model in the same time period; calculating the physical scene condition data by adopting a hidden Markov method to obtain a physical scene of each time step length; evaluating the performance of each model in each physical scene according to the data; inputting the data into a deep neural network coupled based on a time sequence two-dimensional change modeling network and a gating fusion network so as to calculate the optimal time-varying weight of each model; and inputting the data into a Bayesian model averaging method based on a Copula function so as to calculate a set probability forecast result based on coupling of a plurality of models. Therefore, the problems that in the prior art, salinity prediction under different scenes is poor in robustness, evaluation is uncertain and the like are solved.

The invention relates to the technical field of air salinity monitoring of a marine environment, and aims to solve the problems that most of detection devices of a current common salinity measurement technical method are limited to measurement of salinity in water, and a detection method relates to complicated optical path calculation and calibration and cannot meet the monitoring requirements of marine operation equipment and outdoor facilities in coastal areas; according to the portable marine environment air salinity detection device and detection method provided by the invention, salt in water vapor in air is dissolved in water of the humidifier, the temperature sensor is used for performing temperature compensation on the conductivity of the mixed solution, and the air salinity is obtained by measuring the conductivity of the electrode infiltrated in the mixed solution. The measurement method is based on conductivity, does not need to consider the influence of external environment factors such as vibration and angle during use, can be used in continuous motion, is not limited by space, has strong anti-interference capability, and is suitable for marine environment detection in complex climate.

The invention relates to the technical field of salinity measurement, in particular to a water salinity measurement and correction method and system for seawater desalination. The method comprises the following steps: acquiring the conductivity, the water outlet side pressure and the salinity of each sensor on two sides of the RO component in the seawater desalination process; for each sensor, according to the similar condition of the change characteristics of the conductivity of each time period in the historical period and the current time period and the fluctuation difference of the conductivity of the historical period and the current period, screening the matched time period; the Kalman filtering gain during conductivity denoising is adjusted by combining the conductivity of the periods in which the current time period and the matching time period are located, and the conductivity is filtered; according to the conductivity of the sensors on the water inlet side and the water outlet side, the corrected conductivity and the pressure on the water outlet side, the pollution degree is obtained, the level of the RO assembly is combined, the salinity measurement interference index is determined, then the Kalman filtering gain during salinity denoising is adjusted, and the salinity is filtered. According to the invention, the accuracy of salinity determination is improved.

The invention discloses a microwave sensor, a mineralization degree measuring system, a method for determining a measurement physical quantity and a frequency point of the microwave sensor and a mineralization degree measuring method. The sensor comprises a transmitting unit, a detecting unit and two antenna units, wherein the antenna unit is an enameled wire; the mineralization degree measuring system is used in a dynamic experiment and an anti-interference experiment, and the microwave sensor is arranged on the side wall of a pipeline of the mineralization degree measuring system; the determination method is suitable for the mineralization degree measurement system, and amplitude characteristics and frequency points are obtained; according to the measurement method, the salinity is obtained by adopting the amplitude characteristics and the frequency points; the antenna unit of the system is made of an enameled wire material, and is insulated, corrosion-resistant and high in plasticity; the emission detection unit accurately regulates and controls signals, and data quality is improved; and the mounting base is integrated, sealed and leakproof. On the basis of experimental data, a radial basis kernel function vector machine is used for fitting nonlinear correlation, two-dimensional screening amplitude is used as a core index, the optimal frequency point is determined through the three indexes, and accurate detection of complex working conditions is guaranteed.