123results about How to "Intrinsically safe" patented technology

A safety station for use in a process plant includes one or more leverless limit switches to detect activation of one or more parts of the safety station. The safety station further includes a wireless transmitter coupled to the leverless limit switches to transmit signals associated with the safety station to a base station device, which is communicatively coupled to one or more control and/or monitoring devices.

A distributed storage construction method based on mimicry construction comprises the steps that a storage driving module receives user request information, encapsulates and converts the user requestinformation and then sends the user request information to a dispatcher; the dispatcher receives the user request information, preprocesses the user request information, and sends the user request information to a plurality of heterogeneous metadata service executors in an active state at the same time according to a distribution rule; the heterogeneous metadata service executor in the active state receives the user request information forwarded by the dispatcher, carries out corresponding request processing operation and sends a processing result to the adjustor; the adjustor receives the processing result information sent by each heterogeneous metadata service executor, classifies the processing result information according to the request sources, performs consistency voting on multiplepieces of processing result information of the same request source, and sends the voted result information to the storage driving module after proper processing; and the storage driving module returnsuser result information to the user after receiving the result information generated after voting of the adjustor.

The invention provides an oil-gas pipeline safety monitoring early warning method and system. The method and the system are characterized in that a communication optical cable is paved around a buried pipeline (1); one of cable cores is taken as a sensing optical fiber (2); one of the cable cores is taken as a communication optical fiber (3); an optical fiber relay amplifying device (5) is arranged along the sensing optical fiber (2); the communication optical fiber (3) is connected with a detection device (6) and a data and control module (7); the data and control module (7) is used for transmitting a relay control signal of the relay amplifying device (5) through the communication optical fiber (3) to realize real-time adjustment of relay amplification; the relay amplifying device can be used for simultaneously amplifying forwardly-transmitted pulse optical waves and a backwardly-transmitted Rayleigh interference optical signal; detected front and back curves are divided with each other to filter background noise, so that the positioning accuracy is increased. By adopting the method and the system, the influence of background noise is low, detection, identification, judgment and positioning functions specific to multi-point vibration signals along a pipeline are realized, and very high detection sensitivity, positioning accuracy and different event identification accuracies are achieved.

A downhole generator comprises a turbine coaxially disposed inside a section of drillstring and that will be spun when hydraulic or pneumatic flows are pushed through to a drillbit motor on a distal end. The turbine, in turn, spins permanent magnets in an orbit around the outside of a cylindrical containment shell. Such containment shell is made of titanium or aluminum and will allow the spinning magnets fields to enter and induce electrical currents in coils within. Current from the coils is rectified and filtered to provide a DC operating voltage through intrinsically safe connectors to various loads including drillstring steering controls, radars, and telemetry circuits. The hydraulic and pneumatic flows stream past all around the cylindrical containment shell from the turbine on their way to the drillbit motor.

The invention relates to a tunnel roof separation dynamic monitoring system based on fiber bragg grating and an early-warning method of the tunnel roof separation dynamic monitoring system, and belongs to the field of mine safety monitoring. The tunnel roof separation dynamic monitoring system comprises a ground data processing and controlling subsystem, an underground data transmission and communication subsystem, and an underground sensor data collecting subsystem, wherein the ground data processing and controlling subsystem is placed in a ground control center room, and comprises a ground superior main supervisory control computer, a fiber bragg grating demodulating device and a power supply; the underground data transmission and communication subsystem comprises a mining transmission optical fiber and an optical fiber junction box; the underground sensor data collecting subsystem comprises at least one fiber gragg grating roof separation monitoring device. The tunnel roof separation dynamic monitoring system realizes real-time online dynamic continuous measurement of the roof separation to obtain the deforming situation of the surrounding rock of the tunnel, detects the reasonability of rock bolting support parameters, and once the parameters excess the early-warning threshold values of the separation, emits accurate early-warning signals, so as to take measures in time and prevent collapse of roof. The tunnel roof separation dynamic monitoring system is of great significance in size of external and internal roof separations in the anchoring area and the stability of the tunnel.

An intrinsically-safe ramp or door prop (10) characterized by a light-weight, transparent ramp having an acutely-angled frontal edge (20), at least one rotatable member or rocker-plate (14) pivotally-attached, for increasing its height, further comprising a kinetic-friction lock, and wireless interface control (28) between an adjacently-housed electronic circuit (16). The circuit (42) is replaceable and sealed and intrinsically-safe for deployment in potentially-flammable or ignitable environments. The electronic circuit further comprises a plurality of multi-colored lamps (24) that visually communicate tactically-significant color signals and bears circuitry (42) to extend battery life wherein lamps may continuously operate for multiple hours. The ramp further comprises attachment points (30) (31) to gang-together a multiplicity of identical ramps whereby fashioning one contiguous block (FIG. 6) of ramps. The block or ramps further being easily manipulated by a user wearing gloves and easily transportable within a utility pocket.

The invention provides a device and a method for monitoring the tension of a steel wire rope of FBG compression type mine hoisting equipment. The device comprises the steel wire rope, anti-slip wedged rubber rings and a packaging casing, wherein the wedged rubber rings are buckled, clamped and nested on the steel wire rope; an elastic compression column and a U-shaped fixing support fixedly connected with the elastic compression column are arranged inside the packaging casing; the U-shaped fixing support is used for fixing a fixed pulley; FBGs are pasted to the upper end surface and the lower end surface of the elastic compression column; the FBGs are connected onto optical fibers in series; each optical fiber penetrates through an optical fiber lead-out hole to be connected with one end of each optical fiber connector outside the packaging casing; the insides of the optical fiber lead-out holes are sealed with sealant; the other ends of the optical fiber connectors are connected with optical fiber pigtails; the optical fiber pigtails are protected by using armed protection rubber; and the top and the bottom of the packaging casing are fastened by clamp nuts and bolts penetrating through bolt holes. The device is simple in structure and convenient to mount, operate and use, the tension can be monitored on the side and on line, an FBG sensing technology is used, the reliability and the measurement accuracy are high, and the error is smaller.

Described in this application is a synthetic P. vivax circumsporozoite protein useful as a diagnostic reagent, for antibody production, and as a vaccine protective against infection with any strain of P. vivax.

The invention relates to an optical fiber vortex flow meter capable of simultaneously measuring temperature, density, volume flow and mass flow, and the meter provided by the invention comprises a meter body, a vortex flow generator and two optical fiber Bragg gratings, wherein the two optical fiber Bragg gratings are respectively connected to two output ports of a 2*2 optical fiber coupler through transmission optical fibers; one input port of the 2*2 optical fiber coupler is connected to a broadband light source; the other input port of the 2*2 optical fiber coupler is connected to a wavelength demodulator and a computer in turn; and the wavelengths and bandwidths of the two optical fiber Bragg gratings meet the conditions that Lambda 2>Lambda 1+Delta Lambda 1+Delta Lambda 2, wherein Lambda 1 and Lambda 2 respectively are the central wavelengths of the two optical fiber Bragg gratings and the Delta Lambda 1 and the Delta Lambda 2 respectively are 3db bandwidths. In the optical fibervortex flow meter, a double optical fiber Bragg grating differential method is used for detecting a vortex flow frequency. The optical fiber vortex flow meter has the characteristics of wavelength coding, wavelength demultiplexing and the like, and is capable of simultaneously measuring temperature, density, volume flow and mass flow. The optical fiber vortex flow meter has the advantages of anti-electromagnetic interference property, electric insulation, corrosion resistance, essential safety, high sensitivity, light weight, small volume, wide scope of measuring objects, convenience in multipoint multiplexing and internetworking remote measuring, and the like.

A known amount of marker may be added to a pressurized hydrocarbon fluid, or combined with an additive to form a mixture, and the mixture may be added to a pressurized hydrocarbon fluid. An amount of the marker in the hydrocarbon fluid may be determined. An amount of the additive in the hydrocarbon fluid may be determined based on the amount of the marker in the pressurized hydrocarbon fluid. An inline system may be used for detection of a marker in a pressurized hydrocarbon fluid. The system is fixed in a pressurized hydrocarbon fluid supply line such that pressurized hydrocarbon fluid flowing from a first location to a second location in the supply line passes through the detection system. The hydrocarbon fluid may be a liquid or a gas. The markers may include a variety of optical markers, such as fluorescent markers. Detection of the markers may include, for example, fluorescence detection.

The invention relates to a ventilation and explosion suppression device for a seal ring of a floating roof tank. The ventilation and explosion suppression device comprises an air supply branch pipe which is communicated with the floating roof tank and externally connected with a gas transmission mother pipe, the annular seal ring is arranged between the tank wall of an oil tank and the side wall of a floating roof, the annular seal ring comprises a primary sealing piece and a secondary sealing piece, and the ventilation and explosion suppression device is characterized in that the ventilation and explosion suppression device further comprises a central distributor, a plurality of radial branch gas pipes and a plurality of arc-shaped gas distribution pipes, wherein the central distributor is arranged in the center position above a top plate of the floating roof and communicated with the air supply branch pipe; the plurality of the radial branch gas pipes are arranged between the central distributor and the seal ring and communicated with the central distributor; the plurality of the arc-shaped gas distribution pipes are arranged in the seal ring or an edge floating cabin and communicated with the radial branch gas pipes, and a plurality of exhaust holes or gas jet heads for conveying gas into the seal ring are arranged on the arc-shaped gas distribution pipes; and a gap for exhausting tail gas is arranged between the tank wall and the top end of the seal ring. The whole set of the system has the advantages of simple structure, low cost, and convenience in use and maintenance, thereby being a simple, economic, reasonable, effective and ideal technological way for realizing intrinsic safety of the oil tank.

A combustible cartridge case is provided that includes at least one energetic thermoplastic homopolymer or copolymer derived from, at least in part, poly(bis-azidomethyloxetane) prepolymer blocks terminated with isocyanate-reactive groups, such as hydroxyl groups. Chain linking of the prepolymer blocks is performed with diisocyanates for end-capping the prepolymer blocks, and a difunctional linking compound for linking the end-capped prepolymer blocks. The energetic thermoplastic is preferably capable of being pressed, extruded, rotational molded, injection loaded, or otherwise shaped into a desired configuration. Also provided is a chain-extended poly(bis-azidomethyloxetane) homopolymer derived from bis-azidomethyloxetane prepolymer blocks, which are terminated with isocyanate-reactive groups and chain extended with at least one diisocyanate end-capping compound and at least one difunctional linking compound.

A fueling environment is equipped with leak detection probes and liquid level probes. Each of the probes is associated with a wireless transceiver. The wireless transceivers send probe data to a site communicator wireless transceiver. To ensure that the site communicator receives the probe data, repeaters are used within the fueling environment. The repeaters receive the probe data, and some period of time after the sensor transceivers stop transmitting, the repeaters retransmit the probe data to the site communicator. The site communicator discards duplicative information and processes the probe data as needed.

The invention discloses a mine-used large-range fiber grating passive roof bed separation sensor, which comprises a shell, a wire rope roller mechanism and a fiber grating strain mechanism, and is characterized in that the fiber grating strain mechanism comprises a second gear, a precision screw rod with one end fixed with the second gear and rotating along with the second gear, a bevel slider with a bevel surface, a strain gauge fixing square block, and a fiber grating strain gauge, wherein the bevel slider sleeves the precision screw rod and can axially move along the screw rod; the strain gauge fixing square block is fixed on a front bearing support frame, and the position of the strain gauge fixing square block is corresponding to that of the bevel slider; and one end of the fiber grating strain gauge is fixed by the strain gauge fixing square block and the other end is a free end contacted with the bevel surface of the bevel slider and capable of sliding relatively, and a fiber grating is attached to the fiber grating strain gauge. The circular motion of the roller pulled by the wire rope changes to the axial motion of the bevel slider on the precision rod, the wavelength of the fiber grating changes, and real-time online dynamic roof bed separation monitoring can be realized.

An optical sensor for detecting hydrogen in a fluid in physical contact with the sensor is provided. The sensor includes an optical fiber, wherein an end portion of the optical fiber is coated with a multilayer including: a sensing layer, including a film of an alloy, the alloy including Mg, Ni, and M, wherein M is at least one of Zr, Ta, and Hf, and wherein the alloy has the composition Mg_xNi_yM_z, and wherein x is from 40 to 60, y is from 10 to 40, and z is from 10 to 40, and a catalyst layer including Pd. Further, a detection system for hydrogen, including such an optical sensor, and an electrical device having such a detection system are provided.

A configurable, connectorized system for providing RTU monitoring of field digital and analog parameters and transmitting data to the Central PLC system dramatically reduces the number of wire connections that must be made to connect sensors and actuators to a PLC system. The system is also extremely rugged and safe to be located in a hazardous environment.

The invention provides a hydrogen sulfide gas sensing device on the basis of an optical fiber F-P (Fabry-Perot) interferometer. The concentration of external hydrogen sulfide gas can be perceived by an optical fiber F-P cavity of the hydrogen sulfide gas sensing device which is a measuring device, and the optical fiber F-P cavity is formed by an optical fiber collimator and a metal groove filled with hydrogen sulfide sensitive organic polymer materials. The refractive index of the organic polymer materials can be changed when the concentration of the external hydrogen sulfide gas is changed, optical paths of transmitted optical waves in the optical fiber F-P cavity can be changed, and accordingly spectral characteristics of interference signals outputted by the optical fiber F-P cavity can be changed. Data of the spectral characteristics of the reflected interference signals of the optical fiber F-P cavity are analyzed, so that the concentration of the hydrogen sulfide gas can be accurately measured. The hydrogen sulfide sensing device has the advantages of simple structure, miniaturization, high sensitivity and precision, electromagnetic interference resistance, intrinsic safety and the like.

The invention belongs to the field of operating condition monitoring of mine machinery and relates to a method and a system for position and posture monitoring of rocker arms of a coal mining machine on the basis of fiber grating. The system comprises three subsystems including a data analysis subsystem, a position and posture data transmission subsystem and a position and posture data sensing acquisition subsystem. The data analysis subsystem is mounted in a ground monitoring room and comprises a monitoring computer, fiber grating demodulation equipment and a power supply; the position and posture data transmission subsystem consists of mining transmission optical fibers and optical fiber junction boxes; the position and posture data sensing acquisition subsystem comprises two groups of fiber grating position and posture monitoring sensors for the rocker arms of the coal mining machine, and the monitoring sensors are mounted at piston rods of front and rear rocker arm hydraulic cylinders of the coal mining machine. The system is simple, feasible, stable and high in precision, real-time online position-posture dynamic continuous monitoring of the rocker arms of the coal mining machine can be realized, and position and posture conditions of the rocker arms of the coal mining machine can be acquired accurately. The method and the system are significant to monitoring of the position and posture conditions of the rocker arms of the coal mining machine.

The invention discloses a volatile organic gas diffusion sampling tube. The volatile organic gas diffusion sampling tube is characterized by comprising a diffusion tube with a micropore structure, wherein an adsorbent is filled in the diffusion tube; baffle blocks for fixing filler in the tube are respectively arranged at the two sides in the diffusion tube; and end openings in the two ends of the diffusion tube are respectively covered by tube caps. Compared with the drive type sampler, power supply and gas exhausting device are not needed, so that the volatile organic gas diffusion sampling tube is small in size, light in weight, simple to operate, convenient to carry, safe, suitable for various environments, and especially suitable for time weighted average concentration detection of personal exposure dose in environmental health and occupational health as well as sampling in a flammable and combustible limited environment.

A portable optical-fiber-sensing apparatus for detecting concentration of flammable and explosive gases and hazardous gases relates to applications of optical fiber sensing to the field of security monitoring on flammable and explosive gases and hazardous gases of coal mines, non-coal mines and petrochemical depots. An optical sensor is used for detection of methane, hydrogen sulfide, carbon monoxide, carbon dioxide or alkanes oil gas, instead of a catalytic combustion sensor or an infrared sensor. The apparatus is high in precision, rapid in response, not affected by temperature and humidity, non-electric intrinsically safe, and long in service life. The optical fiber gas concentration sensing system consists of an optical fiber sensor, an optical-path circuit module and a system software. Different gases are modulated with different-wavelength lasers, and the lasers are transmitted to an open-type gas chamber via an optical fiber. Multiple pairs of lens reflectors are disposed in the gas chamber and make the lasers reciprocate in the gas chamber, and the lasers are interfered by a to-be detected gas and return to the optical-path circuit module for analysis, and are converted into electrical signals which are processed by the portable gas detection apparatus for uploading and alarming. The optical fiber sensor comprises an outer filter screen, the open-type gas chamber and the multiple pairs of lens reflectors.

The invention relates to a method for preparing 4, 4 '-(hexafluoroisopropenyl) diphthalic anhydride. The method comprises the following steps: step 1, mixing 4, 4'-(hexafluoroisopropenyl) di-o-xylene,a metal ion catalyst, a cocatalyst and a solvent to form a homogeneous solution; step 2, injecting the prepared solution into a continuous reactor at a certain speed through a pump, and introducing corresponding equivalent pure oxygen into the reactor; step 3, enabling a reactant solution and pure oxygen to react in the continuous reactor, carrying out separation from the continuous reactor afterstaying for a certain period of time, and enabling a product to enter a gas-liquid separation tank after passing through a cooling module; step 4, separating the product solution to obtain 4, 4 '-(hexafluoroisopropenyl) diphthalic acid (6-FTA); and step 5, performing refining to obtain 4, 4'-(hexafluoroisopropenyl) diphthalic anhydride (6-FDA).