32results about How to "Achieving temperature self-compensation" patented technology

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.

The invention discloses a temperature self-compensating fiber grating micro force sensor and a manufacturing method thereof. The sensor comprises a force-bearing end cover, a sensor upper shell, a sensor lower shell, a hard core, a supporting cylinder and a round elastic diaphragm, wherein the hard core comprises a hard core screw and a hard core nut; the top part of the supporting cylinder passes through the sensor upper shell, and the bottom part is fixed with the hard core screw; the supporting cylinder is internally provided with a fiber, a first fiber grating and a second fiber grating are carved on the fiber, one end of the first fiber grating is fixedly connected with the top part of the upper shell and the other end is fixed with the hard core screw and is in a tensioning state, and one end of the second fiber grating is connected with the lower part of the hard core screw and the other end passes through the sensor lower shell and is in a free elastic state. The structure is simple; the force measurement sensitivity and the force measurement range of the sensor can be changed in a large range, production and manufacturing of batch sensors with multiple specifications are facilitated; temperature self compensating can be realized; and long-term and reliable effective monitoring by the sensor in a temperature-varying environment can be realized.

A temperature-self-compensating fiber-integrated bragg grating strain transducer comprises a fiber bragg grating transducer body composed of two bare fiber bragg gratings with the same model but different wave bands, an elastic sheet composed of high-elasticity metal thin sheets, clamping pieces, bases, a Z-shaped movable piece composed of L-shaped steel plates and a metal frame. The metal frame is provided with a frame shaft hole and a frame connecting shaft, and a connecting shaft of the Z-shaped movable piece penetrates through the frame shaft hole to be fixedly connected with the base II through the clamping piece II and can relatively move in the frame shaft hole. One end of the elastic sheet is fixedly connected with the L-shaped plates of the Z-shaped movable piece, and the other end of the elastic sheet is fixed on the metal frame. The frame connecting shaft is fixedly connected with the base I through the clamping piece I. A cantilever beam stress structure is formed by the frame, the Z-shaped movable piece, the elastic sheet, the bases and the clamping pieces. Under the working state, the two bases are fixed on the surface of a component to be tested in a bolting or welding mode, and when the component to be tested is strained, the bases and the Z-shaped movable piece are driven to drive the elastic sheet to deform, and then the fiber bragg gratings deform.

The invention discloses a load sensor element used in a humid water environment, comprising a substrate, a transition buffer layer arranged on the upper surface of the substrate, an insulating layer arranged on the upper surface of the transition buffer layer, and a transition buffer layer arranged on the upper surface of the insulating layer. The functional layer and the protective layer on the upper surface of the functional layer; the base is made of 316L stainless steel, the transition buffer layer is CrNi film, and the insulating layer is TiO 2 film, the functional layer is FeCrMn alloy film, and the protective layer is Al 2 O 3 membrane. In the present invention, in the humid water environment, the load sensor element can be firmly fixed on the sample, and the connection between them is inorganic, thus eliminating zero point drift and creep, realizing temperature self-compensation, and improving the load sensor element. characteristics of the sensitivity and accuracy of the measurement results.

The invention discloses a temperature self-compensation high-resolution high-frequency demodulation system and method for a fiber bragg grating. According the optical path transmission process, a tunable narrow-band laser device emits narrow-band light which is divided into two light beams through an optical fiber splitter, the two light beams are output through two output ports of the optical fiber splitter respectively, one light beam is transmitted to a sensing grating through the input end of a first optical fiber coupler and returns to the other input end of the first optical fiber coupler after passing through the sensing grating to be transmitted to a first photoelectric detector and be converted into a voltage signal, and then the voltage signal is transmitted to a data colleting and processing device; the other light beam is transmitted to a temperature compensation grating through a second optical fiber coupler and returns to the other input end of the second optical fiber coupler after passing through the temperature compensation grating to be transmitted to a second photoelectric detector and be converted into a voltage signal, and then temperature compensation is performed on the voltage signal through a temperature self-compensation device, so that the variable quantity of the output center wavelength of the tunable narrow-band laser device is obtained. The temperature self-compensation high-resolution high-frequency demodulation system and method have the advantages that temperature self-compensation is achieved, and the resolution is high.

The application discloses a novel fiber grating six-dimensional force sensor and its main structure and measurement method. The main structure provided by the application has good symmetry and is easy to process and manufacture. The fiber grating six-dimensional force sensor provided by this application has only 12 fiber grating elements, and compared with the 24 strain gauges generally required by the sensor of the resistance strain gauge group bridge measurement principle, the number of sensitive elements is doubled. . At the same time, the optical wavelength information is used as the output signal of the sensor, which has the advantages of anti-electromagnetic interference and zero drift. The measurement method provided by this application uses the wavelength difference output information of six groups of fiber gratings composed of 12 fiber gratings to realize automatic decoupling output of six-dimensional force and torque measurement information, and realize temperature self-compensation. Therefore, the present invention reduces inter-dimensional coupling and realizes self-decoupling measurement of three-dimensional force and three-dimensional moment.