15 results about "Fiber optic displacement sensor" patented technology

The application discloses a scanning method of a scanning optical fiber displacement sensor and belongs to the technical field of optical fiber displacement sensors; S1: a scanning platform is established; S2: a scanning surface and the area of the scanning surface are determined; scanning light passes through a lens in a voice coil motor to output laser to irradiate on a to-be-scanned object; diffuse reflection occurs on the to-be-scanned object; after the scanning platform receives the reflected information light of the to-be-measured object, the voice coil motor is used to move the laser to a next position, and the scanning surface of the to-be-measured object is scanned; S3: in the scanning process, the displacement information d of the to-be-measured object is calculated and acquired by means of the reflected light power of the scanning surface and the light power emitted by the scanning platform. The present application improves the existing point type optical fiber displacement sensor into a scanning optical fiber displacement sensor, and the surface scanning is more accurate than single-point scanning, and the change of the object in the direction can be measured.

The application discloses a kind of sensor calibration device and method for rotating curved surface radial deformation measurement, comprising: rack, motor and frequency converter are provided on rack, coaxially fixed with to be calibrated gullet on the output shaft of motor, and frequency converter is used to adjust the rotating speed of motor;Displacement calibration combination device, including fixed on rack X direction guide rail, fixed on the slider of X direction guide rail Z direction guide rail and fixed on the slider of Z direction guide rail accurate displacement adjusting mechanism;Reflective optical fiber displacement sensor is arranged on the moving end of accurate displacement adjusting mechanism, and the probe of reflective optical fiber displacement sensor is arranged along X direction;With the following points: the calibrated surface is rotated by motor, and the obtained calibration curve considers the influence of rotating calibrated surface on sensor, without secondary correction;Calibrated surface rotating speed can be adjusted, multiple continuous calibration of calibrated surface at different rotating speeds can be realized, and calibration efficiency is improved.

This utility model discloses a sheet metal part deformation and adhesive backing failure detection device, which includes a product placement plate, an adhesive backing failure indicator light, a controller, and a deformation indicator light. A product placement area is set on the upper surface of the product placement plate, and several product positioning blocks are arranged around the product placement area. An adhesive backing failure detection component is installed in the product placement area corresponding to the adhesive backing position of the sheet metal part. The adhesive backing failure detection component, the adhesive backing failure indicator light, and the deformation indicator light are electrically connected to the controller. Several fiber optic displacement sensors are also installed in the product placement area of ​​the product placement plate, and each fiber optic displacement sensor is electrically connected to the controller. Indicator light mounting blocks are screwed onto the edge of the product placement plate, and the adhesive backing failure indicator light and the deformation indicator light are respectively mounted on the indicator light mounting blocks. Through the above structural design, this utility model has the advantages of novel structural design and multiple functions, and can simultaneously detect adhesive backing failure and deformation of sheet metal parts.

The invention discloses a transverse multi-end-face coupling-based optical fiber displacement sensor capable of being used for respiratory monitoring and a use method. The transverse multi-end-face coupling-based optical fiber displacement sensor comprises an incident optical fiber, N emergent optical fibers (N is greater than or equal to 2), a coupling part, a rectangular box and a receiving module, the input end of the incident optical fiber is connected with the light source, and the output end is fixed in the through hole of the incident optical fiber module; an emergent optical fiber input end is fixed in an emergent optical fiber module through hole, the end face is flush with one surface of the module, an output end is fixed on a receiving module, and an image sensor is mounted on the opposite side; when the relative displacement does not occur, the output end face of the incident optical fiber is axially collimated with the input end face of one of the emergent optical fibers; when relative displacement occurs, the center of the output end face of the incident optical fiber moves along the geometric center connecting line of the input end faces of the N emergent optical fibers, so that the emergent optical fibers which have overlapping intervals with the center of the output end face of the incident optical fiber output light are subjected to image acquisition and processing by the image sensor to obtain displacement information. According to the invention, high-precision and high-sensitivity real-time monitoring of displacement and respiration can be realized.

The invention provides a generator carbon brush length on-line monitoring system and method based on optical fiber sensing, an optical fiber displacement sensor is used for measuring the change of the distance between the optical fiber displacement sensor and a reflective foil, the distance change is consistent with the length variation of a carbon brush, the length change of the carbon brush can be obtained, and the actual length after the length change of the carbon brush is obtained; meanwhile, the optical fiber temperature sensor is arranged, the optical fiber temperature sensor is used for measuring the temperature variation, the measurement result of the optical fiber displacement sensor is compensated, errors caused by temperature variation are eliminated, and the monitoring accuracy and reliability are greatly improved. According to the invention, on-line monitoring can be realized, manual inspection can be reduced, manpower and material resource consumption can be reduced, reliability can be improved, and the possibility of safety risk caused by carbon brush faults can be reduced.

This invention provides a self-balancing static load displacement detection system and method for foundation piles, relating to the field of foundation pile detection technology. The system includes determining the placement of distributed fiber optic displacement sensors on the pile body based on a digital twin model and multi-condition finite element simulation, using machine learning and multi-objective optimization algorithms, and also deploying temperature and vibration sensors. During the self-balancing loading process, load, displacement, temperature, and vibration signals are simultaneously acquired and time-series aligned and delayed to form a standardized data sequence. The temperature and vibration signals are then used to perform error compensation on the displacement signal using an environmental adaptive calibration algorithm, resulting in a compensated displacement signal. The compensated displacement signal is analyzed in real-time through edge computing nodes to generate a load-displacement curve and calculate key parameters, triggering an early warning when parameters exceed thresholds.

The invention relates to the technical field of measurement, in particular to a landform monitoring method and device based on optical internal and external three-dimensional imaging, and realizes internal and external integrated three-dimensional geological deformation monitoring by combining an external laser radar scanning technology and an internal optical fiber sensing technology. The external monitoring part adopts a laser radar to carry out high-precision three-dimensional scanning on the outer contour of the slope to obtain the information of the outer contour of the slope. The internal monitoring part measures internal displacement changes in the slope rock mass through an optical fiber displacement sensor and collects micro-seismic data in combination with an optical fiber micro-seismic sensor. The micro-seismic data is subjected to inversion of a rock mass velocity field through a travel time tomography method based on a physical information neural network, and the rock mass velocity field is further converted into a stress field. And finally, integrating the internal and external monitoring data, constructing an internal and external three-dimensional terrain monitoring model, and realizing prediction of slope deformation and potential instability. According to the invention, the surface morphology of the slope and the displacement change and stress distribution of the internal rock mass can be obtained in real time, and the slope terrain safety early warning and real-time monitoring capability is improved.

The invention discloses an intelligent constant volume bomb system pressure fluctuation optimization control method based on dynamic damping cavity design, and belongs to the technical field of power and energy. Aiming at the problem of pressure oscillation caused by combustion fluctuation of the constant volume bomb in a high-temperature and high-pressure environment and insufficient adaptability of traditional PID control in a nonlinear system, a damping cavity with a piston is formed in the bottom of the constant volume bomb, and cavity segmentation is achieved through a spring; a pressure sensor and an optical fiber displacement sensor are used for monitoring projectile body pressure and piston displacement; the error and the change rate are calculated by comparing the real-time displacement and the initial displacement of the piston; dynamically adjusting proportional, integral and differential gain coefficients based on a fuzzy rule; a valve control signal is generated through defuzzification by adopting a gravity center method; the gas flow is controlled by adjusting the opening of the damping cavity intake and exhaust electromagnetic valve; closed-loop feedback is formed to maintain the piston position stable, thereby absorbing pressure fluctuations. Broadband pressure suppression is achieved, and steady-state errors are eliminated.

The invention discloses a construction method for a high-fill green lime micro-expansive soil fill roadbed. The method comprises the steps of material pretreatment, accurate mixing, layered filling and pre-expansion treatment, dynamic combined compaction and closed maintenance. The proportion of the lime micro-expansive soil is optimized, so that the lime micro-expansive soil has a controllable micro-expansive characteristic and can still slowly expand after being compacted, settlement caused by self weight and traffic load is actively compensated, and the problem of uneven settlement is effectively reduced; the construction technology of layered filling and dynamic combined compaction is adopted, the compaction effect is enhanced, and the bearing capacity of the roadbed is improved; the expansion amount of the roadbed is monitored in real time by arranging the optical fiber displacement sensor in the roadbed, accurate control over the construction process is achieved, the potential settlement risk can be warned in advance, and the maintenance cost is reduced.

The invention discloses an in-situ online measurement device and method for wet expansion characteristics of a composite material. The device comprises an optical fiber displacement sensor, a sample supporting seat, a weight sensor, a sensor mounting support, a platform supporting seat, a temperature and humidity sensor, a box body temperature control unit, a sealed box body, a drying pipeline, a data acquisition and processing module, a humidity control module, a temperature control module and a vacuum module. The device can realize regulation and control and high-precision on-line continuous monitoring test of various environmental conditions with coupling of multiple elements such as displacement, weight, temperature and humidity. The device can perform one-way, two-way and multi-way simultaneous displacement measurement on multiple types of composite material structural members. Through continuous and synchronous high-precision temperature monitoring, an invar steel alloy with a low expansion coefficient is adopted by a measurement supporting structure, and the influence of temperature change on measurement of the wet expansion size change of a test sample piece is corrected and compensated; the sample end face adopts invar steel alloy as a measurement basis, and the test platform and the test box body adopt shock absorption and isolation measures to improve the measurement precision.

The main problem solved by the present invention is how to extend the range of the fiber optic displacement sensor. The fiber optic displacement sensor with extended range is characterized in that it includes a probe and a fiber optic coupler. The probe includes a transmitting fiber optic port and a receiving fiber optic port. The transmitting fiber optic port can transmit light, and the receiving fiber optic port can receive the light reflected back by the object to be measured. The number of the receiving fiber optic ports is n, and n ≥ 2. Each of the receiving fiber optic ports can receive the light emitted by the transmitting fiber optic port. The number of the transmitting fiber optic port is one, and the fiber optic coupler has n input ports and one output port. The beneficial effect is that the n receiving fiber optic ports can enhance the received light by n times. After the reflected light intensity is enhanced, its change value per unit distance naturally increases. The distance range where the reflected light intensity was originally very weak can now also be distinguished, so its range will inevitably increase accordingly.

The present application relates to the field of measurement technology, in particular to a kind of based on optical inside and outside three-dimensional imaging topographic monitoring method and device, combined with external laser radar scanning and internal optical fiber sensing technology, realize the three-dimensional geological deformation monitoring of inside and outside integration.External monitoring part uses laser radar to carry out high-precision three-dimensional scanning to slope outer contour, obtains the information of slope external contour.Internal monitoring part measures the displacement change in the internal of slope rock mass by optical fiber displacement sensor, and combines with optical fiber microseismic sensor to collect microseismic data.Microseismic data is inverted rock mass velocity field by travel time tomography method based on physical information neural network, and is further converted into stress field.Finally, the inside and outside three-dimensional topographic monitoring model is constructed by comprehensively monitoring data, realizes the prediction to slope deformation and potential instability.The present application can obtain the displacement change and stress distribution of slope surface topography and internal rock mass in real time, improves the ability of slope topographic safety early warning and real-time monitoring.

The application discloses a kind of high fill green lime micro-expansive soil fill roadbed construction methods, method includes material pretreatment, accurate mixing, layered filling and pre-expansion treatment, dynamic combination compaction and closed maintenance;The application is by optimizing the proportion of lime micro-expansive soil, so that it has controllable micro-expansion characteristics, can still slowly expand after compaction, actively compensate the settlement caused by dead weight and traffic load, effectively reduce the problem of uneven settlement;The construction technology of layered filling and dynamic combination compaction is used to enhance the compaction effect and improve the bearing capacity of roadbed;The expansion of roadbed is monitored in real time by setting optical fiber displacement sensor in roadbed, accurate control of construction process is realized, potential settlement risk can be warned in advance, and maintenance cost is reduced.

The utility model provides an underground mine pressure monitoring device for a coal mine. The underground mine pressure monitoring device comprises a ground master control terminal, a distributed monitoring base station and a detection terminal, the detection terminal is arranged in an underground working area and comprises an optical fiber pressure sensor, an optical fiber displacement sensor, an optical fiber temperature sensor, an optical fiber vibration sensor and a plurality of gas concentration sensors; the distributed monitoring base station is provided with a signal mediation assembly, a processor assembly, a wireless transmission assembly, an underground alarm assembly and a power supply. The ground master control terminal comprises an upper computer and a ground alarm assembly, the upper computer is in communication connection with the wireless transmission assembly, and the ground alarm assembly is electrically connected with the underground alarm assembly. According to the utility model, on-line automatic monitoring of pressure, displacement, temperature, vibration, gas concentration and other multi-information of the top plate in the underground coal mine working area is realized, and high accuracy and reliability are realized.

This utility model relates to the field of landslide monitoring and early warning technology, and discloses a multi-layer sliding surface landslide monitoring and early warning device. The device includes a base with a through-hole at the center of the top of the base, a bracket installed on the top, and a fixed column fixedly connected to the top of the bracket. A multi-layer sliding monitoring mechanism is provided on the surface of the base and the bracket. An automatic tracking power supply mechanism is provided on the top of the fixed column, and an audible and visual alarm mechanism is provided on the surface. The monitoring mechanism drives the drill rod to drill into the soil through a hydraulic cylinder. It uses fiber optic displacement sensors, acceleration sensors, and soil moisture sensors to monitor the landslide status from multiple dimensions. A honeycomb permeable protective cover and other structures ensure the stable operation of the sensors. The automatic tracking power supply mechanism adjusts the orientation of the solar panel through a photosensitive sensor and a servo control motor to improve charging efficiency. The audible and visual alarm mechanism emits audible and visual signals when the monitoring data reaches the early warning threshold. This device can realize real-time monitoring of multi-layer sliding surfaces, has a long-lasting power supply, and provides timely early warning, making it suitable for field landslide monitoring.