31results about How to "Long-term online monitoring" patented technology

The invention relates to an ultrasonic monitoring sensor for the corrosion of a steel bar in concrete. The ultrasonic monitoring sensor is characterized by being provided with a steel bar (1), wherein a piezoelectric ceramic column (2) for transmitting is arranged at one end of the steel bar (1) and is used for transmitting ultrasonic waves; a piezoelectric ceramic column (3) for receiving is arranged at the other end of the steel bar (1) and is used for receiving the ultrasonic waves; the axial directions of the piezoelectric ceramic column (2) and the piezoelectric ceramic column (3) are the same as the axial direction of the steel bar; the piezoelectric ceramic column (2) for transmitting and the piezoelectric ceramic column (3) for receiving are provided with a shielding lead wire (4) for transmitting and a shielding lead wire (5) for receiving, respectively; the shielding lead wire (4) for transmitting and the shielding lead wire (5) for receiving are externally provided with a resin insulating layer (6) and a shielding layer (7), respectively; in the use process, the sensor is buried into the concrete during construction; the shielding lead wire (4) for transmitting is connected with a signal generator (8) to generate the ultrasonic waves and the shielding lead wire (5) for receiving is connected with a signal receiver (9) to receive the ultrasonic waves; the corrosion condition of the steel bar in the concrete (10) is monitored according to the change of received ultrasonic wave signals.

The invention relates to a multi-beam deformation detecting device which comprises a probe, a digital signal processor DSP, a personal computer PC, a laser group and a prism reflection target, wherein the prism reflection target is arranged on a point to be tested, the probe and the laser group are arranged on a measuring point, a laser beam group emitted from the laser group is reflected through the prism reflection target by adjusting the laser group and then forms an overlapped light spot on the probe, a barycenter of the overlapped light spot is determined by utilizing a photoelectronic tracing macro pixel iteration barycenter method, and the deformation of the point to be tested is further determined through the barycenter offset distance. The invention can effectively avoid the influences on environmental change, air turbulence and stray light, can realize long-term online monitoring, and has accurate measurement data, high detection precision, simple structure, low cost and convenient operation.

The invention relates to a remote bridge structure monitoring and prewarning method based on an Internet of things technology. The remote bridge structure monitoring and prewarning method comprises the following steps of: (1) building a bridge model and calculating to obtain the dynamic deflection of a beam; (2) continuously acquiring data of monitored points to obtain a sequence [u] of the dynamic deflection, and carrying out forecast evaluation on the performances of a bridge system by using a specific mode based on a chaotic system, wherein the step (2) comprises the substeps of: (2.1) calculating a maximum Lyapunov index of the sequence [u]; (2.2) calculating the delay time and an optimal embedded dimension; and (2.3) carrying out fitting and contrast on the reconfigured chaotic time sequence to realize health monitoring and prewarning of a bridge structure. The remote bridge structure monitoring and prewarning method is used for analyzing the monitored data and precast evaluation on the future working state of a bridge to realize prewarning.

The invention discloses a multifunctional air environment monitoring and control device, comprising: a sensor part which senses one or more parameters of ambient air environment and outputs the parameters as analog quantity or digital quantity or frequency; a central processing unit part which processes and outputs signals detected by the sensor; a power supply part which provides energy for various parts of the multifunctional air environment monitoring and control device; an operation part which is operated by a user and controls the device by inputting a command; a display part; an output part; and a communication part which is a two-way communication interface to transmit digital data of the central processing unit part to other external devices and receive the data and the command from the outside. Single gas or mixed gas in the environment can be respectively monitored and controlled by the multifunctional air environment monitoring and control device, and the monitored air quality indicators can be displayed and directly controlled or transmitted to other devices, thereby being convenient for use.

The invention discloses an intelligent acoustic emission continuous monitor for the stability of materials such as rock, concrete, metal structure, and the like, in particular a motor for carrying out damage-free monitoring for the materials such as rock, concrete, metal structure and the like so as to predict the stability of the materials. The acoustic emission technique can realize real-time continuous rock monitoring and precisely analyze acoustic emission collecting data. The invention uses acoustic emission measuring theory to collect and monitor the characteristics of the parameters such as number of acoustic emission events, number of key events, acoustic emission rate, and the like. The monitor automatically calculates through a microprocessor, displays and stores typical acoustic emission parameters (number of acoustic emission events, number of key events and acoustic emission rate) in real time; a FLASH flash memory with 64 M capacity can continuously store data for 2-3 months. The data stored by the intelligent acoustic emission continuous monitor is analyzed and processed through self-developed PXAE rock acoustic emitter software.

The invention discloses an on-line monitoring analyzer for fluorinion in water and detection method thereof, the method is characterized in that: by design and integral assembly innovation of a multi-branch plate solenoid valve combination module, a stirring and detection tank module, a signal acquisition control unit and a parameter setting control and analysis display unit, automatic operation of sensor signal acquisition, solenoid valve control, peristaltic pump control, stirring device control, waste liquid discharge, and result analysis, calculation and display, is implemented; preparation of high and low fluorine standard solutions and multi-step measurement can be automatically completed; and a condition that multi-devices are manually controlled for measuring in current detection is overcome. By technology integration and modularization design for the current test processes by a technical scheme provided by the invention, long-term, continuous, simple and rapid on-line monitoring on fluorinion in water can be easily implemented by apparatus for a non professional. The method has advantages of high result instantaneity, small reagent amount and low operation cost.

The invention provides a hidden fault detection method for a relay protection device. The method includes the following steps that: I, voltage amplitude values of nodes in a power grid are measured and collected; II, state estimation is performed on the measured values, so that the estimated values of the nodes can be obtained, and the reference value of hidden failure detection is determined; III, the threshold value of the hidden failure detection is determined; and IV, hidden failure determination conditions are determined, so that whether a hidden failure exists can be judged. With the method adopted, a relay protection device with a hidden fault can be effectively detected out, and therefore, protection malfunction or protection operation failure caused by the hidden fault can be avoided, and the accident of the power grid can be further avoided.

The invention provides a real-time monitoring method of pressure center load of a wing based on strain actually measured through a fiber grating. The method comprises following steps of 1, adhering a fiber grating sensor on the wing; 2, acquiring strain actually measured by the fiber grating sensor; 3, analyzing the pressure center load of the wing; and 4, calculating the pressure center load of the wing. In this way, by use of the strain data actually measured by the fiber grating adhered to the wing, the pressure center load of the wing is calculated, so the effect is achieved that the pressure center load of the wing can be acquired only by use of the strain data actually measured by the fiber grating without other information like wing load and the wind structure, so an actual problem is solved that real-time monitoring is performed on the pressure center load of the wing only based on the strain data actually measured by the fiber grating is solved.

The invention relates to a method for online monitoring of pollutants in water. The method is characterized by comprising the following steps: attaching a lightweight and flexible surface-enhanced Raman substrate onto a water surface, absorbing the pollutants enriched in the water through the floating of the substrate on the water surface and then detecting Raman signals of the pollutants on the surface of the substrate in combination with a surface enhanced Raman technology, thereby reflecting the situation of the pollutants in the water, finally realizing the long-term online monitoring of the pollutants in the water and ensuring the water quality safety. Compared with other detection methods, the method is simple and quick and low in cost, can perform long-term online monitoring on the water quality safety and is very wide in application prospect in the environmental monitoring field.

The invention discloses a manufacturing method and a testing method of a piezoelectric ceramic sensor for concrete ERT imaging. The manufacturing method comprises following steps: fixing A, B wires ona positive pole and a negative pole to form an emitting terminal; fixing C,D wires on the positive pole and the negative pole to form a receiving terminal; covering the wires by glue, painting glue on the positive pole, fixing a shielding wire E on the positive pole of the receiving terminal, smearing the conductive layer, painting glue again to cover the shielding wire; connecting the other endsof the wires of the emitting terminal and the receiving terminal to two sensor joints; preparing a mould, smearing a release agent, fixing a piezoelectric ceramic sheet in the center of the mould ina suspension state; evenly mixing cement and epoxy resin according to a mass ratio of 1:(1-2) to prepare an encapsulation material, pouring the encapsulation material into the mould with the fixed piezoelectric ceramic sheet to form a filled block; completely drying the filled block, and removing the mould to obtain the piezoelectric ceramic sensor. During the construction process, the sensor is buried in concrete to online real-time monitoring the corrosion of steel bars in a long term.

The invention discloses a seabed observation network system based on an integrated junction box, which comprises a first shore base station and a second shore base station, the first shore base station and the second shore base station are connected through a submarine cable, the submarine cable is formed by connecting a plurality of sections of submarine optical cables, and two adjacent sectionsof submarine optical cables are connected through the integrated junction box. Each integrated junction box is connected with a sensor, and the integrated junction boxes are used for controlling the sensors to collect seabed information data, transmitting the collected seabed information data to seabed optical cables connected with the integrated junction boxes and transmitting the seabed information data to the adjacent integrated junction boxes through the seabed optical cables. And the seabed information data is continuously forwarded to the next integrated junction box through the adjacentintegrated junction box, and is finally transmitted to the first shore base station or the second shore base station. According to the invention, ocean information data can be conveniently and effectively acquired and communicated in real time, the transmission time delay is reduced, and the data transmission reliability is improved.

Provided is a slewing bearing stress distribution monitoring method based on fiber bragg gratings. The method is characterized by comprising the following steps that step (1), evenly distributed grooves (8) are formed in the end surface of a slewing bearing fixing ring (4); step (2), epoxy resins are used for pasting a fiber bragg grating strain sensor (7) on the grooves of the slewing bearing fixing ring (8), and a fiber bragg grating temperature sensor (6) is installed near each fiber grating strain sensor for temperature compensation; step (3), a space division multiplex switch is used forconnecting each branch to a demodulation module for data processing analysis to obtain slewing bearing stress distribution. According to the slewing bearing stress distribution monitoring method basedon the fiber bragg gratings, the fiber bragg grating strain sensor is used for measuring the deformation of the end surface of the slewing bearing fixing ring, the fiber gragg grating temperature sensor performs temperature compensation, the influence of temperature on the fiber bragg grating strain sensor is eliminated, a space division multiplex technology is adopted to connect each branch to the demodulation module for demodulation, data analysis and processing are performed to obtain the slewing bearing stress distribution, and an on-line monitoring function of slewing bearing is achieved.

The invention discloses a system for monitoring the moisture content of a side slope soil body based on piezoelectric intelligent aggregate. The system comprises a computer, an NI data acquisition and analysis system, a power amplifier, a piezoelectric intelligent aggregate sensor, a sliding slope surface, a sliding bed, a side slope body, a piezoelectric ceramic piece and an electric wire. The invention relates to the technical field of long-term on-line monitoring methods of soil slope moisture content, and discloses a system for monitoring the moisture content of a side slope soil body based on piezoelectric intelligent aggregate, a moisture content data acquisition, analysis and processing system which is simple and convenient to use, economical and efficient is formed, and related processing software such as Labview, Matlab and the like is combined, the moisture content of the soil slope is monitored on line in real time for a long time, long-term, on-line, remote and rapid monitoring of the water content in the soil slope is achieved, the moisture content condition of each key position in the soil slope can be accurately evaluated, the response speed is high, and the whole system has good stability and durability.

The invention relates to the technical field of PCB testing, particularly relates to a multi-channel low-resistance test system and is suitable for a PCB access resistance value detection process. Thesystem comprises a data acquisition unit for PCB access resistance data acquisition, a test unit for data acquisition unit detection, an upper computer connected with the test unit and a current source used for providing electric power support, wherein the upper computer is suitable for sending a test instruction for detection of the data acquisition unit to the test unit, the test unit sends a corresponding test signal to the data acquisition unit according to the test instruction, and the upper computer is further suitable for receiving detection data fed back by the data acquisition unit and obtained by the test unit, and is used for monitoring a PCB online. The system is advantaged in that by adopting an automatic control principle, problems of possible interference, instability and the like in the manual measurement process are solved, and long-term on-line monitoring can be performed on the PCB which is placed in the environment test box and is subjected to a high-low temperature impact test, so the resistance change condition of a PCB passage in different environments can be conveniently observed.

The invention relates to a rear-arranged in-concrete reinforcing bar rust expansion strain monitoring device which belongs to the technical field of monitoring equipment. The device comprises a threaded reinforcing bar, a base and at least two sets of sensing units. Each sensing unit comprises a cylindrical column, a resistance strain meter which is arranged on the external surface of the cylindrical column, and a thick wall support arranged outside the cylindrical column. The bottom of the thick wall support is provided with a supporting platform for supporting the cylindrical column. The sensing unit further comprises an insulating lead. The resistance strain meter is connected with the insulating lead. A plurality of sensing units are successively connected and are connected with a strain acquisition instrument through the insulating lead. The bottom of the supporting platform of the thick wall support of a downmost sensing unit is connected with a base. The threaded reinforcing bar is arranged in the cylindrical columns of the plurality of successively connected sensing units and is connected with the base. The rear-arranged in-concrete reinforcing bar rust expansion strain monitoring device has advantages of higher precision, higher reliability and high information volume. The device can directly realize continuous testing for the reinforcing bar rust expansion strain and furthermore realizes long-term and real-time online monitoring to a rusting process and a rust corrosion process of the reinforcing bar in a common concrete structure.

The invention provides an underground laser detection device, which consists of two parts: a ground optical control unit and an underground monitoring unit, wherein the ground optical control unit isarranged in a base station, and is responsible for producing laser; the underground monitoring unit is buried underground, and is responsible for transmitting a laser beam produced by the ground optical control unit to a detection region, and transmitting the laser beam back to the ground. The underground laser detection device provided by the invention is a piece of optical detection technology-based pipeline detection equipment, and as a monitoring means, the internationally most advanced gas monitoring technology-laser monitoring technology is applied to detection of underground pipelines for the first time by the underground laser detection device. The underground laser detection device is high in sensitivity and fast in reaction speed, is also capable of detecting out tiny leakage immediately in an instant that the leakage occurs, is high in anti-interference performance and has no false alarms and the drift and poison deactivation problem of a traditional methane gas sensor.