445 results about "Self compensation" patented technology

The invention belongs to the building support component technology field including the stress automatic control and monitoring as well as the structural safety, and relates to a steel tube supporting internal force automatic compensating and displacement controlling system. The system comprises an upper system, a PLC control system module and a field executive system. A steel support is arranged on a reinforced concrete diaphragm wall, a hydraulic jack is arranged on the steel support, and real time pressure monitoring values are fed back through a pressure sensor. The steel support and the hydraulic jack form a pre-stressed steel support structure, the hydraulic jack is connected with a hydraulic pump station through an oil circuit, and is connected with the PLC control system module through the pressure sensor, the hydraulic pump station is connected with the PLC control system module, and a PLC controlling device is connected with the upper system. Through auto-control software and a PLC control system, the automatic control to the axial force of the steel support is realized, thereby controlling the displacement and the settlement of the deep excavation supporting structure and the adjacent basic facilities.

The invention discloses a two-node measuring equipment unrelated quantum key distribution system. Two independent laser devices and a measuring device Charlie are all placed on the same node, namely an Alice end or a Bob end to form the two-node bidirectional transmission quantum key distribution system. According to the system, a two-node structure is adopted, the Faraday conjugated rotation effect is utilized, and the same transmission path is designed; as a result, the problem that an existing three-node measuring equipment unrelated quantum key distribution system is poor in stability due to polarization change, phase drift, non-uniform phase reference systems, time jitter and other factors is effectively solved, the purposes of polarization self-compensation, phase drift self-compensation, calibration-free phase reference systems and easy synchronization are achieved, and an important basis is provided for practical application of the measuring equipment unrelated quantum key distribution system.

The invention provides a temperature self-compensation fiber grating displacement sensor which has a structure that two bare fiber gratings which are encapsulated by capillary metal tubes are connected with a probe through a metal connecting block, a spring and a centre rod to form a main body of the temperature self-compensation fiber grating displacement sensor to execute functions; then the main body is arranged in a metal box; finally, the end parts of the capillary metal tubes are fixed with the metal box through the metal connecting block, fibers penetrate out from small holes positioned on the metal connecting block and the lateral wall of the metal box, and the probe can freely stretch through a guide rod hole of the metal box. When a displacement sensor is arranged on the structure, the probe and the metal box relatively move to enable the bare fiber gratings to extend or shorten so as to generate the drift of the operating wavelength of the bare fiber gratings when the structure generates displacement, and the displacement and the temperature of the structure can be tested by utilizing a temperature compensation principle and a displacement computing formula of the displacement sensor.

The invention belongs to the technical field of optical fiber sensing, and relates to an optical fiber F-P (Fabry-Perot) cavity pressure sensor with temperature self compensation. The F-P cavity pressure sensor with temperature self compensation adopts an optical fiber with an optical grating as a transmission optical fiber and adopts an optical F-P cavity as a pressure sensitive element, wherein the F-P cavity sensitive element is a non-intrinsic optical fiber F-P cavity, and the optical fiber gating and the optical F-P cavity are connected in a mode of glue bonding or carbon dioxide laser welding. According to the mode of pressure sensing, the sensor is divided into side pressure type optical fiber F-P cavity pressure sensors with temperature self compensation and end pressure type optical fiber F-P cavity pressure sensors with temperature self compensation.

The invention relates to a single-shaft rotary type inertial navigation system. The invention further relates to a special error self-compensation method of the single-shaft rotary type inertial navigation system. The single-shaft rotary type inertial navigation system comprises an indexing mechanism and a single-shaft rotary type inertial navigation system inertial measurement unit, wherein the single-shaft rotary type inertial navigation system inertial measurement unit is mounted on an inertial measurement unit mounting plane; the inertial measurement unit mounting plane and the indexing mechanism are connected together; coordinate axes of the single-shaft rotary type inertial navigation system inertial measurement unit are vertical to each other two by two; each coordinate axis is provided with a gyroscope and an accelerometer. According to the single-shaft rotary type inertial navigation system disclosed by the invention, real-time drifting estimation is implemented by adopting a manner of realizing an adjustable inclined angle of an IMU (Inertial Measurement Unit) mounting plane; the inclined angle can be dynamically readjusted at intervals, so as to further improve the compensation effect of the system; a previous process of recalibrating in a laboratory with a high-precision inertial navigation testing rotary table can be finished in field in a use process, and the guarantee and maintenance costs of an operation period of the inertial navigation system are greatly reduced.

The invention relates to a tilt angle sensor based on optical fiber Bragg gratings and a method for measuring a tilt angle of the tilt angle sensor and belongs to the technical field of measurement of a structural tilt angle. The tilt angle sensor comprises a fixed base plate (12), a fixed pressing block (6), a thin-wall type uniform-section metal beam (9) and a quality block (7), wherein the upper end of the thin-wall type uniform-section metal beam (9) is arranged on the fixed base plate (12) in a mode of fitting with the fixed pressing block through a first movable pressing block (10) and a fifth screw (11); the quality block (7) is fixed at the lower end of the thin-wall type uniform-section metal beam (9) through a sixth screw (15) and a second movable pressing block (16); and a first optical fiber Bragg grating (13) and a second optical fiber Bragg grating (14) are respectively adhered to opposite positions on two sides of the thin-wall type uniform-section metal beam (9). By the method, the size and direction of the tilt angle can be detected according to a correspondence relation between the change of central wavelengths of the two optical fiber Bragg gratings and the tiltangle. The invention is high in measurement accuracy and has a temperature self-compensation function.

The invention discloses a clamp structure for clamping and autocompensation; a clamping block (3) is arranged on a clamp; the surface of the clamping block (3) for clamping a workpiece is a clamping surface (4); and the clamping block (3) is made of an elastic material. With the technical proposal adopted, abrasion occurring in a clamping part and the change of the surface of the clamped workpiece are subjected to compensation by a simple elastic structure so as to ensure that a gripping jaw has enough clamping force in clamping and to guarantee the dimension of the workpiece after various machining processes (such as welding).

The invention discloses a dual bootstrap and voltage compensation technology-based A/D converter sampling switch, which comprises a primary switch unit used for a to-be-sampled signal channel to sample to-be-sampled signals, a underlayer voltage bootstrap unit for realizing the underlayer voltage bootstrap of a switching tube PMOS Switch in the primary switch unit, a grid voltage bootstrap unit for realizing the grid voltage bootstrap of the switching tube PMOS Switch in the primary switch unit, a storage unit for parallelly sampling input signals VIN and realizing the temporary storage of a VIN voltage, and a voltage compensation unit for compensating the sampling output voltage of an output end VOUT. The invention provides a sampling switch which is capable of working at low voltage and low power consumption and is insensitive to process errors. Meanwhile, the adopted voltage self-compensation method effectively solves a nonlinear problem caused by clock feedthrough occurring after the grid voltage bootstrap of the switching tube.

The invention discloses a distributed optical fiber large-deformation measuring sensor which is characterized in that a stain sensing optical fiber is embedded into a large-deformation measured spring, particularly embedded into or fixed on a spring rod interlocked with the spring; one end of the large-deformation measuring sensor is fixed with the spring rod so that when the spring expands to become deformed, the deformation quantity of the spring is corresponding to that of the spring rod and has the corresponding relation with the deformation quantity of the stain sensing optical fiber; the deformation quantity of the spring can be obtained by measuring strain of the optical fiber, thus realizing the conversion from the large-deformation of the spring to the little strain of the optical fiber; and the stain sensing optical fiber is connected with the optical fiber of a Brillouin back scattering luminous power measuring instrument. The sensor is characterized by large measuring range, variable measuring range, stably, reliability, corrosion resisting, temperature self-compensation, realization of a plurality of series connections, easy to industrial production, convenient installation, etc.

A toggle-lever clamping device for clamping work pieces includes a box-shaped body which supports a clamping member movable between a forward disengaging position and a backward position for clamping the work piece. The device also includes control elements operatively connected to the clamping member by elements of an intermediate toggle-lever connecting link, and an articulated quadrilateral system; the intermediate connecting link is in the form of an axially yieldable flat spring having a plurality of side by side arranged elastically yieldable spring sections, aligned according to its longitudinal axis. The articulated quadrilateral system and the intermediate connecting link are constructed and disposed in such a way as to maintain an irreversible locking condition of the clamping member to clamp work pieces, compensating differences in thickness of the work pieces.

The invention discloses an optical fiber grating hydrophone with static pressure self-compensation, belonging to the technical field of an optical fiber sensor. The main body of the optical fiber grating hydrophone is a cylindrical supporting canister (10) in axial symmetrical structure. The optical fiber grating hydrophone comprises an optical fiber grating (20) disposed at the central axis line in the supporting canister (10) and used for measuring underwater sound; a first piston (21) and a second piston (22) respectively disposed at the two ends of the optical fiber grating (20) and used for transmitting the underwater sound pressure to the optical fiber grating (20); a first optical fiber hole (13) and a second optical fiber hole (14) respectively opened at the centers of the two ends of the supporting canister (10) in axial direction and used for leading out a tail fiber of the optical fiber grating (20). The invention improves the hydrostatic proof ability of the optical fiber grating hydrophone without the cost of the high sensitivity.

The invention discloses an optical fiber grating acceleration sensor and a test method thereof, relating to the technical field of optical fiber grating vibration sensing. The optical fiber grating acceleration sensor comprises a U-shaped shell, a steel beam, a first optical fiber grating, a second optical fiber grating, a mass block, a spring, damping fluid, a clamping groove, a concave lever, a folding arch beam and a seal cover, wherein the opening end of the U-shaped shell is provided with the seal cover; the inner wall of the U-shaped shell is connected with one end of the steel beam, and the other end of the steel beam is fixedly connected with the folding arch beam; the folding arch beam is fixedly connected with the concave lever; the concave lever fixed to the clamping groove is connected with the mass block; the mass block is connected with the inner wall of the shell by the spring; the first optical fiber grating and the second optical fiber grating are respectively arranged on the folding arch beam; and the damping fluid is filled in the U-shaped shell. The invention realizes the repeated design and use according to the engineering practical demand and changes the system rigidity by conveniently disassembling and replacing folding arch beams with different sizes, thereby realizing the adjustability of sensitivity and natural vibration frequency and achieving the aim of temperature self compensation.

A method for self-compensation of the bias draft of the quadrature signal of a gyroscope. The method is a combination of a variety of sub-methods, which can include quadrature compensation, can be used to achieve the highest possible stability. The calibration methods include a temperature self-sensing algorithm utilizing the drive-mode resonance frequency for calibration of thermal drift in the mechanical parameters of the system, a sideband-ratio approach for direct detection of mechanical drive-mode amplitude, modifying the AC and DC components of the amplitude gain control (AGC) for improved stability, and an approach for compensation of thermal drift in the sense-mode pick off system by utilizing mechanical quadrature. By using some or all of the four methods of calibration above, the highest level of long term in-run bias stability can be achieved.

The invention provides a self compensation floating swing arm independent suspension system, comprising a self compensation floating swing arm independent suspension device and a centrifugal force control scissors-type anti-roll bar device. The two mechanisms can be used in combination or independently and are applicable to both front wheels and rear wheels. The self compensation floating swing arm independent suspension system guarantees that wheels perform line bounce along a vertical direction of a car body on various kinds of road surfaces when a car runs at a low speed or at a high speed or makes turns and guarantees maximum contact area between the wheels and the road surfaces, with the parameters of king pin angle, toe-in angle, camber angle, wheel track, and axle base being maintained the same as original parameters; and, when the car makes turns, the centrifugal force control scissors-type anti-roll bar device works automatically, offsets a roll force with a force equal to the roll force in magnitude and opposite to the roll force in direction, and enables the car body to lower automatically, thereby improving anti-roll capacity and realizing idealization of controllability, safety, stability and comfort of the car. The self compensation floating swing arm independent suspension system has a simple structure, excellent performance, and low cost, and is easy to realize.

An apparatus and method for compensating a coordinate measurement machine is provided, which may be, e.g. a laser-based coordinate measurement machine, laser tracker, or other coordinate measurement device. In one exemplary method, such compensation comprises self-compensation of payload parameters by means of embedded tracker targets. In another exemplary embodiment, such compensation comprises self compensation of payload, azimuth-post, axis, or RO parameters by means of embedded temperature sensors.

The invention relates to an optical fiber current mutual inductor, which comprises a photoelectric processor, a transmission optical fiber and a sensor head. The invention can utilize general transmission optical fiber, insulate the sensor head from the polarization disturbance caused by the double refraction of the transmission optical fiber via the polarization self-compensation structure of the sensor head, and make the input and output optical fibers same via adding one light directed transmitter in the photoelectric processor and arranging a reflector in the sensor head to effectively counteract the radial effect of optical path. The reflective structure can pass linearly-polarized light through magnetooptical Faraday component of two times to improve one power of current detection sensitivity and reduce the volume of the sensor head. The invention is suitable for measuring high-voltage large current of electric power system and is suitable for batch production of miniaturized photoelectric mutual inductor with low cost.

The invention discloses an optical fiber Raman cable temperature monitoring and alarm system with attenuation self-compensation. The system comprises an optical fiber pulse laser, an optical fiber wavelength division multiplexer, a first photoelectric receiving module, a second photoelectric receiving module, a data acquisition module, a computer, a calibrating optical cable, a sensing optical cable, a reflector and a point type temperature sensor. The computer software comprises three parts, namely real-time temperature monitoring, historical data retention and temperature rise fault alarm. An optical fiber Raman distributed temperature sensor with attenuation self-compensation can eliminate influence of optical fiber attenuation change along the cable caused by bend, strain, node loss and particularly long-term operation and working environment difference, attenuation self-compensation is realized, and the temperature-sensing stability and reliability of the system are improved. The cable temperature monitoring and alarm computer software can realize early warning and alarm by comparing the current data and historical data to obtain an operating state of the cable.

The invention provides a fiber grating cable tension transducer with a temperature self-compensation function, belonging to the field of transducer technologies. The transducer provided by the invention is characterized by comprising a metal baseplate, a clamping piece, a micro fiber grating strain transducer and a cable component of fiber transmission. The measuring sensitivity of the transducer can be adjusted by changing sizes of elements of the transducer in accordance with actual requirements, thus being suitable for monitoring cable tension of the different cables in real time. The fiber grating cable tension transducer can measure the cable tension of the cables indirectly by measuring an anchor head structure and utilize the properties of the fiber grating to improve the cable tension sensitivity coefficients of the transducer, and is not influenced by structural materials and external environments. The fiber grating cable tension transducer can eliminate influences of eccentric forces on measuring values, realize the temperature self-compensation and overcome the defects that a traditional electric transducer is subjected to electromagnetic interference easily and is poor in long-term stability, and has the advantages of high accuracy, light weight, low influences on the properties of the structure and the like.