6 results about "Laser displacement meter" patented technology

A protective device and method for a continuous wind tunnel flutter test model, belonging to the field of wind tunnel testing technology, addresses the problem that traditional physical methods cannot measure the deformation of special structural models during flutter tests. The device includes a reflector and a laser displacement meter matrix, which are respectively positioned opposite each other on the two sidewalls of the wind tunnel test section. One end of the test model is connected to one sidewall, and the free end of the test model extends horizontally towards the other sidewall. The amplitude at a specified position on the test model is calculated using the laser displacement meter matrix, and this is used as the criterion for the activation of the safety protection device. Once the calculated result exceeds the safe range, the safety protection device can be quickly activated to protect the test model and stop the wind tunnel test. This device and method overcome the shortcomings of using other types of sensors for safety threshold judgment in continuous transonic wind tunnel flutter tests, avoiding damage to the wind tunnel and test model during flutter tests.

The application provides a hot-pressing intelligent control regulation method and device based on FPC, and belongs to the technical field of FPC hot-pressing processing. The method synchronously collects the surface image and three-dimensional topographic point cloud data of the FPC substrate through a camera and a laser displacement meter, realizes real-time detection based on conditions, intelligently switches the feature extraction mode according to the interference detection result, adopts an edge detection algorithm when no interference occurs, starts a Bayesian Dropout network to perform multiple random sampling inferences when interference occurs, activates a digital twin to predict deformation characteristics if the coefficient of variation is greater than a preset threshold, calculates the hot-pressing parameter compensation amount according to the deformation characteristics and adds a tolerance weight, and continuously optimizes the control effect through closed-loop feedback. The application effectively solves the image feature extraction distortion problem caused by optical interference, and significantly improves the hot-pressing control precision and product yield.

Disclosed are a substrate including a metal clad laminate including a metal foil and a cured product of a prepreg, and an insulating layer laminated on at least one surface of the metal clad laminate, in which the metal clad laminate has 400 μm or more of an average thickness T1 measured by a predetermined method using a laser displacement gauge, and 10 μm or less of an absolute value D1 of a difference between a maximum value and a minimum value of a thickness, and a printed wiring board and a semiconductor package using the substrate.

This invention discloses a slope model moisture migration testing device under freeze-thaw cycles, comprising: a model box containing a soil-rock slope model, with the bottom of the model connected to an automatic water replenishment device. The automatic water replenishment device includes a sample water replenishment tank, a pressure balance pipe, and a Mariotte bottle. A fluorescent tracer is added to the sample water replenishment tank to allow for direct observation of the moisture migration process within the slope. The freeze-thaw cycle system of this device includes an upper cold bath plate, a cold bath device, a lower ambient temperature plate, an ambient temperature water pump, and connecting pipelines to simulate the freeze-thaw cycle of a slope caused by actual atmospheric environmental changes. The device includes a laser displacement meter, a temperature sensor, a data acquisition instrument, a computer, an ultraviolet lamp, and a digital camera to collect data on physical quantities such as displacement and temperature during the deformation process of the slope model, providing a quantitative analysis basis for the required research. By simulating the temperature rise and fall effects of the atmospheric environment on the slope model through the freeze-thaw cycle system, the deformation and internal moisture migration process of the slope model under freeze-thaw cycles are observed. This provides a basis for the mechanism research and prediction and early warning of geological disasters on slopes in cold regions.

The application discloses a kind of soil centrifuge simulation marine environment pile multi-direction loading test device and method thereof, belong to civil centrifuge test technical field, the device includes: model box, square frame, sliding mechanism, at least one aluminum pipe mounting section, rotary transmission mechanism, backing plate, thrust loading mechanism, load sensor, linear variable differential transformer, multiple miniature pore pressure sensor, at least one multi-position laser displacement meter;The method is applied to the above-mentioned one kind of soil centrifuge simulation marine environment pile multi-direction loading test device;Not only can the displacement accumulation of fan foundation in the whole life cycle under the action of multi-direction, cyclic loading under multi-direction loading, stiffness variation law, but also can study the evolution law of different seabed soil settlement, consolidation and other physical and mechanical properties, and is evaluated and analyzed through multi-angle.