116 results about "Fiber optic displacement sensor" patented technology

The invention provides a fiber mine water inrush precursor information monitor comprising a sensor array, a fiber splitter, a fiber grating demodulation device and a computer. The sensor array comprises a fiber temperature sensor, a fiber strain sensor, a fiber displacement sensor and a fiber osmotic pressure sensor which are all fiber grating sensors, and temperature, strain, displacement, osmotic pressure, and other physical quantities collected by the fiber grating sensors are sent to the fiber grating demodulation device by the fiber splitter through optical fibers; and the fiber grating demodulation device converts collected light wavelength signals into electric signals and finally sends the electric signals to the computer, and the computer analyzes and monitors on-site information by a software system in real time.

The invention relates to a multilevel static-dynamic coupling mechanical loading device for a high-frequency fatigue test, and belongs to the fields of scientific instruments and mechanical property tests of materials. The device comprises a high-frequency fatigue loading unit, a low-frequency fatigue loading unit, a tensile loading and detection unit and a synchronous rotating unit. The device realizes tensile fatigue loading through a servo motor, a piezoelectric stack and an ultrasonic vibrator assembly, and simultaneously realizes detection of load and displacement through a mechanical sensor and an optical fiber displacement sensor. The motor drives a rotating mechanism by a motor to realize real-time dynamic crystal diffraction characterization performed on a sample by a synchronous radiation light source. Moreover, a dual-V gap feature defect sample can realize a composite load test mode of tensile-sheering or tensile-bending and the like close to the actual stress form of a material. The multilevel static-dynamic coupling mechanical loading device provided by the invention is compact in structure, and can integrate multiple test methods, thereby providing an effective test tool for the high-frequency fatigue test of the material.

A differential pressure transducer which incorporates a Fabry-Perot sensor for direct quantitative measurements of the distance displaced by a piston abutting two pressure boundaries is described. The apparatus includes a piston with an annular protrusion which is fitted into a transducer housing having a peripheral groove that serves as a stop to prevent damage to the in overpressure situations. A method of measuring differential pressure using a Fabry-Perot sensor is also contemplated.

The invention discloses a pressure-bearing fault activated water inrush multi-field information collaborative monitoring sudden-inrush forecasting method and system. In the mining process of a coal seam with a fault, stope surrounding rock stress change is caused by mining, thus stope surrounding rock is subjected to displacement, damaged fractures are produced accordingly, a seepage water inrushchannel is formed, and stope surrounding rock seepage and temperature change are caused. Through an optical fiber stress sensor, an optical fiber displacement sensor, an optical fiber seepage pressuresensor, an optical fiber temperature sensor, an optical fiber micro-seismic sensor and a network parallel circuit copper electrode, fault activated water inrush precursory information of fault surrounding rock stress, displacement, seepage pressure, temperature, micro seism and apparent resistivity in the mining process is collected. According to initial values and change amplitudes of the precursory information of the stress, the displacement, the seepage pressure, the temperature, micro seism and the apparent resistivity, pre-warning thresholds and judgment criterias corresponding to the precursory information are determined. By utilizing the pressure-bearing fault activated water inrush multi-field information collaborative monitoring system, real-time and dynamic monitoring pre-warning of activated water inrush during pressure-bearing fault mining is achieved.

The invention discloses a probe inserting device of a scanning probe microscope. A stepping motor (8) is fixed on a base of the probe inserting device of the scanning probe microscope in a direction perpendicular to a horizontal direction, wherein the stepping motor (8) is connected with a piezoelectric ceramic scanner (7); a sample platform (11) is arranged on the piezoelectric ceramic scanner (7); the tip of a probe (2) is downward and the probe (2) is positioned rightly over the sample platform (11); a laser source (9) is installed above the probe (2); a photoelectric sensor (10) is positioned above the probe and is used for receiving a position signal of a light spot reflected by the probe (2), converting the position signal of the light spot into a voltage signal and sending the voltage signal into a controller (4); the stepping motor (8) is controlled by the controller (4) to drive a sample to approach the probe (2); the probe inserting device of the scanning probe microscope further comprises a dual-channel reflective optical fiber displacement sensor; and the distance between the probe and the surface of the sample is detected by the dual-channel reflective optical fiber displacement sensor. Under the control of the controller, the thick probe inserting speed is increased; and in combination with thin probe insertion control, the probe inserting device realizes quick probe insertion.

The invention provides an optical fiber displacement sensor with an ultra-short baseline compliant cylinder structure and an optical fiber strain gauge. The optical fiber strain gauge comprises an optical fiber displacement sensor body (1), a measure baseline (4), a baseline fixing device (5), a suspension system (3), a measure control and signal recording and processing system (6) and a measurement calibration device (7); the optical fiber displacement sensor body (1) is fixed on a first bed rock (21) and connected with the head end (41) of the measure baseline (4); the tail end (42) of the measure baseline (4) is provided with the measurement calibration device (7) and fixed on a second bed rock (22) through the baseline fixing device (5); the suspension system (3) is arranged in the middle of the measure baseline (4), and the displacement sensor (1) and the measurement calibration device (7) are connected with the measure control and signal recording and processing system (6) through a signal connecting wire. The optical fiber displacement sensor is applied to a geophysical research, observation of crustal strain and solid tide, obtaining of earthquake precursor information and the like.

Self-focusing lens is added behind indication grating of pattern displacement sensor. The self-focusing lens is connected to multimode optical fiber. Remote end of the said optical fiber is connected to instrument of photovoltaic conversion and differentiating direction circuit. Using self-focusing lens and multimode optical fiber picks up displacement signal of Moire fringe behind main grating and indication grating. The said displacement signal is transferred to remote end for carrying signal processing further. Comparing with prior art, the invention possesses features of lightweight, small size, large range, high precision and wide communication frequency band. The sensor is applicable to site, where there are strong electromagnetic interference and nuclear radiation, and capable of remote measuring.

The invention relates to a hybrid magnetic suspension knitting needle driving device. The hybrid magnetic suspension knitting needle driving device comprises a housing and a knitting needle; the housing is of a cylindrical structure; a coil skeleton is arranged in the housing in a sleeved manner; the coil skeleton is of a cylindrical structure; the inner circumferential surface of the coil skeleton is symmetrically provided with two radial supporting blocks along the central axis of the coil skeleton; each radial supporting block is equipped with an optic fiber displacement sensor in signal connection with a control system; a primary coil, a secondary coil and a tertiary coil are respectively wound around outer circumferential surfaces of the lower part, middle part and upper part of the coil skeleton; the primary coil, the secondary coil and the tertiary coil are all electrically connected with the control system; the knitting needle is arranged in the coil skeleton in an inserted manner; the middle part of the knitting needle is located between the two radial supporting blocks; the bottom part of the knitting needle is provided with a cylindrical permanent magnet; the permanent magnet is located in the lower part of the coil skeleton; and the permanent magnet and the coil skeleton are coaxial. The design not only reduces the response time of the device and increases the axialdisplacement of the knitting needle, but also simplifies the control process.

The invention discloses an optical fiber slope dam displacement settlement monitoring system which comprises an optical fiber osmotic pressure sensor, an optical fiber displacement sensor, an optical fiber grid settlement sensor, an optical fiber water level sensor and a demodulator, wherein the optical fiber osmotic pressure sensor, the optical fiber displacement sensor, the optical fiber grid settlement sensor and the optical fiber water level sensor are connected with the demodulator through optical fiber; light emitted from a laser in the demodulator is transmitted to different sensors through optical cables; optical signals with information amount to be measured can be reflected back from the sensors; information to be measured is demodulated after the optical signals reach the demodulator to be displayed on a screen; the optical fiber osmotic pressure sensor is used for detecting information of a phreatic line; the optical fiber displacement sensor is used for detecting displacement information of a slope dam body; the optical fiber grid settlement sensor is used for detecting settlement information of the slope dam body; the optical fiber water level sensor is used for detecting the water level information of the slope dam body.

The invention relates to a shield tunnel joint opening and dislocation monitoring system based on an optical fiber reflection principle. The shield tunnel joint opening and dislocation monitoring system based on the optical fiber reflection principle is used for monitoring the waterproof performance of segment joints, and comprises a displacement sensor monitoring device, a sliding rail axially fixed to an inner wall of tunnel segments, a movable data receiver and an upper computer, wherein the displacement sensor monitoring device comprises optical fiber displacement sensors, reflection sheets, a laser light source, a photovoltaic converter and a data collector; and the movable data receiver can move along the sliding rail to regularly receive the data of the data collector arranged in ashield tunnel and transmit to the upper computer.

The invention discloses an acoustic logging system using acoustic waves for transmitting signals. The system is mainly composed of a detection system, a piezoelectric transducer, an oil pipe, a relay converter and an acoustic wave receiver. Signals are detected by the detection system, converted by the piezoelectric transducer, transmitted by the oil pipe, and received by the acoustic wave receiver. The system can monitor the underground working state in real time, uses the acoustic wave as a signal transmitting carrier which is small in attenuation, and is suitable for deep well operation; moreover, the propagation speed, in a steel medium, of the acoustic wave is high, and the signal transmitting efficiency can be greatly improved; the oil pipe serves as a channel to transmit the signals, and therefore cost is saved. A Helmholtz amplifier is used for amplifying the signals of the receiving end, the device is simple in structure, magnification times are large, and the resonance frequency is only related to the size parameter of the device. An optical fiber displacement sensor is used for receiving the signals, the system does not make direct contact with a detected object, transmitting loss measurement of light in optical fibers is used, and the system is high in sensitivity.

The invention discloses a technique of monitoring abrasion of brake linings by optical fiber sensing. An optical fiber displacement sensor is applied to a brake, the thickness of friction blocks on the braking lining is monitored by the optical fiber displacement sensor, and accordingly abrasion degree of the brake linings is shown by data, a driver can clearly learn about abrasion of the brake lining, timely replacement is facilitated, and safety accidents caused by reduced braking performance are avoided.

A fiber displacement feedback closed-loop control two-dimensional flexible hinge worktable relates to a flexible hinge worktable and is provided with a two-dimensional flexible hinge platform, a horizontal piezoelectric ceramic drive, a vertical piezoelectric ceramic drive, a horizontal fiber displacement sensor and a vertical fiber displacement sensor; the two-dimensional flexible hinge platform is provided with a horizontal mounting hole, a vertical mounting hole, a horizontal fiber mounting channel and a vertical fiber mounting channel; the horizontal piezoelectric ceramic drive and the vertical piezoelectric ceramic drive are respectively arranged in the horizontal mounting hole and the vertical mounting hole; the horizontal fiber displacement sensor is provided with horizontal fibers, while the vertical fiber displacement sensor is provided with vertical fibers; the horizontal fibers and the vertical fibers are respectively arranged in the horizontal fiber mounting channel and the vertical fiber mounting channel; the horizontal fiber mounting channel and the vertical fiber mounting channel are respectively provided with curved-teeth structures; and the output ends of the horizontal fibers and the vertical fibers are externally connected with a detecting closed-loop control device.

The invention provides an ultra-short base line differential plate type optical fiber displacement sensor and an optical fiber strain gauge. The ultra-short base line differential plate type optical fiber displacement sensor comprises an outer frame, wherein an outer ring of a displacement conversion device is tightly pressed on the outer frame by a pressing ring with external threads, a threaded pillar of a central press washer penetrates through a central hole in the displacement conversion device, and a first Faraday rotating mirror and a second Faraday rotating mirror are solidified on the central press washer; and an optical fiber coupler and a phase modulator are fixed on the surface of the inner wall of the outer frame, the outer frame and a fixed base are fixed, a first measurement optical fiber and a second measurement optical fiber are respectively wound into multilayered optical fiber loops with hollow plate type layered structures, the first measurement optical fiber and the second measurement optical fiber are respectively solidified on the upper surface and the lower surface of the displacement conversion device, the coupler is connected with the fist Faraday rotating mirror, the phase modulator and a detector, the fist measurement optical fiber is connected with the first Faraday rotating mirror, the phase modulator is connected with the second measurement optical fiber, and the second measurement optical fiber is connected with the second Faraday rotating mirror. The ultra-short base line differential plate type optical fiber displacement sensor and the optical fiber strain gauge are mainly used for observing earth crust strain and solid tide, and acquiring earthquake precursor information.

The invention relates to the technical field of basic detonators and discloses an automatic basic detonator grain height detection and waste rejection device, which comprises an anti-explosion chamber, a grain height detection system and a waste rejection device, wherein the anti-explosion chamber is used for transmitting a mold loaded with a plurality of detonators to an automatic mold transmission system in the anti-explosion chamber; the grain height detection system is arranged in the anti-explosion chamber and provided with a lifting cylinder and an optical fiber sensor connected with the lifting cylinder; the lifting cylinder and the optical fiber sensor are respectively connected with a computer outside the anti-explosion chamber through a programmable logic controller (PLC); and the waste rejection device is arranged in the anti-explosion chamber, connected with the computer through the PLC and used for rejecting detonators of which the heights are unqualified. The automatic basic detonator grain height detection and waste rejection device is high in production efficiency, can accurately detect the height, can avoid missed detection, and can realize safety production in a man and machine separating mode.

The invention relates to an intelligent monitoring method of waterproof performance of early warning subway shield tunnel segment joints, which is used for monitoring waterproof performance of segmentjoints. An adopted segment joint monitoring system comprises a displacement sensor monitoring device, a slide rail fixed on the inner wall of the tunnel segment axially, a mobile data receiver and anupper computer, the displacement sensor monitoring device comprises an optical fiber displacement sensor, a reflector sheet, a laser source, a photoelectric converter, and a data collector, and the mobile data receiver can move along the slide rail so as to receive and transmit data of the data collector distributed in the shield tunnel to the upper computer regularly.

The invention discloses a closed type displacement sensor calibrating device, which comprises a power electric machine connected with a movable shaft, the movable shaft is supported by an angular contact bearing pack, the movable shaft is equipped with a analyte movable ring, both the analyte movable ring and the pick-up probe are sealed in the sealing cavity provided with a medium inlet and a medium outlet, the end cover of the sealing cavity is connected with a differential head and a probe protective sleeve, the sensor bracket moves in a straight line by arranging one bearing between the differential head measuring rod and the sensor bracket, the pick-up probe and the sensor bracket are relatively fixed, the probe protective sleeve is connected with the pick-up probe, and the tail of the pick-up probe is connected with a sensor post treatment and result display part. The closed type displacement sensor calibrating device provided by the invention has the characteristics of calibrating optical fibre displacement sensors and other displacement sensors in liquid and gas fluid media under static and rotational conditions, so that the calibration environment of the sensor is approximate to the operating ambient of the sensor and then the resolution of the sensor is obtained under the condition of most approximate to the operating ambient.

The present invention relates to an optical fiber displacement sensing system-based displacement measurement signal analysis method. The main objective of the invention is to solve the technical problems of poor environmental adaptability, serious influence of environmental factors and poor stability in the prior art. According to the method of the invention, a signal source, an object to be measured and a bisector power divider connected with the signal source are adopted; the first output end of the bisector power divider is connected with a directly modulated laser; the directly modulated laser is connected with an optical fiber displacement sensing probe; the optical fiber displacement sensing probe is connected with a high-speed photoelectric detector; the radio frequency input end of an IQ mixer is connected with the high-speed photoelectric detector; the local oscillation input end of the IQ mixer is connected with the second output end of the bisector power divider; the output end of the IQ mixer is connected with a post-processing module; the signal source is used for outputting microwave signals; the microwave signals pass through the bisector power divider and then are converted into optical carrier signals by the directly modulated laser; and the high-speed photoelectric detector is used for converting the optical wave signals into microwave signals. With the method provided by the technical schemes of the invention adopted, problems can be well solved. The method can be applied to the optical fiber displacement sensor industry production.

The invention discloses a demodulation method based on a fiber displacement sensor demodulation device; the demodulation device comprises a wide spectrum light source, an electric light modulator anda computer; the output end of the wide spectrum light source is connected with a fiber coupler; one output end of the fiber coupler is connected with a displacement sensing probe; the displacement sensing probe is connected with a to-be-tested object; the surface of the fiber coupler is provided with a reflector; the output port of the fiber coupler and the reflector form a Michelson interferometer; a demodulation signal outputted by the electric light modulator passes a dispersion fiber and enters a high speed photoelectric detector; the high speed photoelectric detector converts the light signal into a microwave signal; the microwave signal is amplified by a low noise amplifier; the output end of the low noise amplifier is connected with a microwave power divider. The element parametersof the system can be set so as to freely adjust the resolution of the displacement sensing system; the nanometer level displacement sensing precision can be realized through parameter optimization, thus solving the problems that factors like a poor environment adaptability and a light signal jitter ambient temperature can greatly affect the sensor performance.

The invention relates to an optical fiber measurement device used for a superconducting spherical rotor; an optical axis of a rotary axial optical fiber displacement sensor (3) is coincided with a rotary axis of the superconducting spherical rotor, a rotation speed optical fiber sensor (2) and a motor controlled optical fiber sensor (4) are positioned at both sides of the rotary axial optical fiber displacement sensor (3); the optical axes of the rotation speed optical fiber sensor (2), the rotary axial optical fiber displacement sensor (3) and the motor controlled optical fiber sensor (4) are vertical to a plane (6) at the top part of the superconducting spherical rotor; the three sensors are fixed at a sensor support (1), and the positions thereof are on a straight line. A signal reading graph (5) is etched on the plane (6) at the top part of the superconducting spherical rotor. The measurement device of the invention adopts the non-contact optical fiber sensors for measuring the suspension height of the superconducting spherical rotor and the rotation speed of the superconducting spherical rotor and generating a motor-driven pulse signal for controlling the rotation speed of the superconducting spherical rotor.

The invention relates to a fiber displacement sensor, a fiber displacement detection device and a fiber for sensor. The fiber displacement sensor comprises a fiber having a bendable section. The fiber core for transmitting light waves of the fiber is provided with a light leakage hole for enabling a part of the light waves to be leaked at the bendable section of the fiber, and at the place of the same curvature radius when the bendable section bends, the light leakage hole faces to the direction same with the direction of the curvature radius or opposite to the direction of the curvature radius. The fiber displacement sensor further comprises a fiber deformation device for enabling the curvature of the bendable section to change according to the displacement change of two objects having relative displacement. When the two objects having relative displacement have displacement change, the fiber deforms under the action of the fiber deformation device, and the light leakage hole can enable the light intensity of the fiber to change obviously when the bending condition of the fiber changes, thereby realizing improvement of system detection sensitivity, reducing fiber cost, and reducing the cost of matched wavelength processing equipment; and production, debugging and maintenance are done conveniently.

The invention relates to a method and device for detecting a distributed contact resistance pressure of a tulip contact, and relates to the technical field of power equipment. The method comprises thesteps of: rigidly welding a gold-plated optical fiber displacement sensor at the upper end of a contact finger of the tulip contact; zeroing deformation quantity of each contact finger of a static contact of the tulip contact in the circumferential direction before a moving contact of the tulip contact is inserted; inserting the moving contact of the tulip contact, and measuring the deformation quantity in the circumferential direction among different contact fingers by the rigidly welded gold-plated optical fiber displacement sensor; determining a radial deformation quantity among the different contact fingers according to the deformation quantity in the circumferential direction; and determining contact pressure distribution of the each contact according to the radial deformation quantity of the contact finger. The method and device of the invention has the beneficial effects that: off-line and on-line measurement for the distributed contact pressure of each contact finger of the tulip contact can be achieved, early contact hidden dangers caused by poor assembling working conditions and the like can be discovered in time, and working reliability of the tulip contact can be improved.

The invention discloses a multi-point radial artery pulse condition acquisition system and method. The system comprises an imaging sensor, a pressure sensor, an optical fiber displacement sensor and an electrocardio pulse apparatus, wherein the imaging sensor is connected to a host through an image acquisition card, the pressure sensor, the optical fiber displacement sensor and the electrocardio pulse apparatus are connected to a CPU (central processing unit) controller, a data acquisition card and an A / D (analog to digital) converter through signal conditioning circuits including amplifying and filtering circuits and then connected to the host after passing through a safety isolation circuit (DC-DC). According to a provided pressure-sampling probe, an elastic element system is simple in structure and easy to implement. Temperature and pressure response results are separated with an analytical method.

The invention provides a push-pull optical fiber displacement sensor with a compliant cylinder structure and an optical fiber strain gauge. A first optical fiber displacement sensor fixed on a first bed rock is connected with the head end of a measure baseline bar; a second optical fiber displacement sensor fixed on a second bed rock is connected with the tail end of the measure baseline bar; the first optical fiber displacement sensor and the second optical fiber displacement sensor are connected with a measurement control and signal recording and processing system through signal connecting wires; a laser output a light source passes through an isolator, and then the energy is averaged into two parts by a first coupler; a half of light energy is injected into the first optical fiber displacement sensor, and the other half of light energy is injected into the second optical fiber displacement sensor. The push-pull optical fiber displacement sensor can be widely applied to the field of geophysical researches of observing crustal strain and solid tide, obtaining earthquake precursor information and the like.

The invention discloses a method and system for field application and calibration of a reflection fiber optic displacement sensor. The method includes the steps that when a target surface is monitored to be in the range of a laser displacement sensor and the fiber optic displacement sensor, the preset moving speed, the preset moving distance and the preset moving direction of the target surface are set; a motor controls the target surface to move according to the preset moving speed, the preset moving distance and the preset moving direction, and the measurement value collected by the laser displacement sensor is read in real time in the moving process; the actual moving speed of the target surface is calculated according to the measurement values, and when the actual moving speed is judged to be consistent with the set moving speed, the measurement value collected by the laser displacement sensor is recorded, and the voltage value measured by the fiber optic displacement sensor is read; accurate time hack is conducted on the measurement value and the voltage value, then storage is conducted, and fitting is conducted according to the measurement value and the voltage value to generate a calibration curve. The method and system for field application and calibration of the reflection fiber optic displacement sensor solve the problem that a fast and high-precision field suitable for different reflection conditions for calibration cannot be built at present.

The invention discloses a device for testing zero distortion of a carbon fiber member, which comprises a high-low temperature control cabinet [1], a high-low temperature testing box [2], a measurement system control box [3], a temperature sensor [4], an MTI2000 optical fiber displacement sensor [5], a computer control and analysis system [6] and a carbon fiber member [7]. The device solves the problem of poor precision of detecting a thermal expansion coefficient of the traditional carbon fiber member. By adopting the device for testing the zero distortion of the carbon fiber member, the detection problem of zero distortion performance of the carbon fiber material member in a working environment with larger temperature difference variations can be solved. The device for testing the zero distortion of the carbon fiber member has the advantages of simpleness and convenience for operation, high detection precision and low equipment cost.

The invention discloses a dual-wavelength nonlinear displacement demodulation method and system of optical fiber Fabry-Perot displacement sensor, belonging to the technical field of optical fiber sensing. The system comprises an optical fiber Fabry-Perot displacement sensor, two paths of wave length tunable lasers, two optical fiber couplers, an optical fiber circulator, a wavelength division multiplexer, two photoelectric detectors and a data collection card. The method comprises the following steps of: 1) acquiring two paths of reflectance spectrums; 2) setting working wavelengths of the twopaths of lasers, and respectively determining initial phases; 3) performing phase conversion of the reflection spectrums, curve fitting and solving of an inverse function; 4) calculating the change quantity of the optical phase, and determining the change quantity of the cavity length; 5) and demodulating the nonlinear displacement according to the model. The dual-wavelength nonlinear displacement demodulation method and system can improve the measuring range of the traditional optical fiber Fabry-Perot displacement sensor, are high in demodulation precision, can overcome the problem of fuzzyphase, are flexible in demodulation, and can give evaluation for the reliability of the demodulation result.

The invention provides a displacement monitoring device and method based on optical fiber bending loss. The displacement monitoring device comprises a displacement collection and conversion assembly,a measuring assembly which is connected with the output end of the displacement collection and conversion assembly and a data processor which calculates the displacement amount of a to-be-measured target according to measurement data of the measuring assembly. The displacement collection and conversion assembly converts the displacement amount of the to-be-measured target to be measurable within ameasurable range of optical fiber bending loss, that is to say, the large displacement of the to-be-measured target is converted into small displacement with the measuring range of optical fiber bending loss, thus the displacement amount of the to-be-measured target is obtained through a method of measuring optical fiber bending loss and calculating the displacement of the to-be-measured target,and therefore, the displacement amount of the to-be-measured target is monitored. The displacement monitoring device and method have the advantages of being high in precision and good in economic benefit; the displacement monitoring device can measure the displacement amount in the direction opposite to the direction of tension or pressure on the to-be-measured target on the basis of optical fiberbending loss, and the limitation that an existing optical fiber displacement sensor can only measure single-direction displacement is broken through.