5results about How to "Improve distance accuracy" patented technology

This invention provides a novel scanning laser wind-measuring radar, employing a high-stability, narrow-linewidth semiconductor laser as the transmitting device. A high-speed optical switch precisely modulates the continuous laser in the time domain to generate ideal laser pulses. High-power amplifiers and low-noise amplifiers are used to enhance the transmitted power and echo signal quality, significantly compensating for the decrease in atmospheric echo power and improving range resolution and wind speed accuracy. The high-stability, narrow-linewidth laser improves the signal-to-noise ratio through a triple mechanism of increased coherence efficiency, reduced background noise, and sharpened spectral resolution, enabling long-range detection. When using a transceiver telescope system, it avoids a reduction in the scanning field of view due to a decrease in signal-to-noise ratio. The semiconductor laser solution is lighter than fiber lasers, suitable for airborne platforms, and enables miniaturized laser wind-measuring radar equipment. Furthermore, the high-stability, narrow-linewidth semiconductor laser used meets temperature and vibration stability requirements, ensuring the long-term reliability of the wind-measuring radar in field environments.

The utility model discloses a range finding telescope, comprising a first lens cone assembly comprising a first objective lens group, a first prism group, a first focusing lens, a first display screen, a first ocular lens group and a laser emission assembly used for emitting laser, which are arranged in sequence and arranged at intervals; the laser emitting assembly comprises a coaxial dual-wavelength semiconductor laser, and the coaxial dual-wavelength semiconductor laser comprises a first laser chip, a second laser chip, a first optical lens, a second optical lens and a dichroscope; the second lens cone assembly comprises a second objective lens group, a second prism group, a second focusing lens, a second display screen, a second eyepiece group and a laser receiving assembly used for receiving laser, which are sequentially arranged at intervals; the laser receiving assembly comprises a photoelectric sensor. The distance measuring telescope provided by the utility model not only can carry out calibration and distance measurement on a long-distance target to be measured, but also can improve the measurement distance and the measurement precision.

A fixed electrode type crack soil body water infiltration monitoring device comprises an organic glass container, the organic glass container is of a box-shaped structure, the top face of the organic glass container is transparent, a remolded soil body is contained in an inner cavity of the organic glass container, an activated carbon adsorption layer is laid on the top face of the remolded soil body, a prefabricated crack is formed in the remolded soil body, and the top face of the remolded soil body is provided with an activated carbon adsorption layer. The top end of the prefabricated crack penetrates through the activated carbon adsorption layer, a plurality of electrode fixing plates are laid on the top surface of the activated carbon adsorption layer, a plurality of electrode bars vertically penetrate through the electrode fixing plates, and the top ends of all the electrode bars are sequentially connected through a cable; according to the utility model, the electrode placement time can be saved, and the electrode placement distance precision is improved; in addition, the device is low in manufacturing cost and can be used for two-dimensional high-density measurement and three-dimensional high-density measurement; the scheme is supported by the youth science fund project of the national natural science fund, the serial number is 42207200, and the scheme is a coupling infiltration mechanism of dominant flow and matrix flow in fissure soil of the loess plateau edge irrigation area.

The present application relates to the technical field of non-contact measurement, and provides a large-range and high-precision eddy current distance measuring sensor, which comprises a base and a top cover plate fixed to the top of the base, the base has a containing cavity, a control circuit board is installed in the containing cavity, the base also has a shielding layer and an eddy current coil circuit board, the shielding layer is formed by splicing at least two shielding plates, a via hole is formed in the center, and the bottom of the base is sealed with sealing glue. The product adopts a large-size eddy current coil circuit board and a reasonable shielding scheme, the shielding layer adopts a splicing form of shielding plates, the product can be actually placed on the ground, has the characteristics of non-contact, large range, high precision and the like, and is suitable for related requirements of railway wagon measurement and use. The product as a whole adopts a compact integrated design, has a clever structure design, is convenient to maintain as a whole, and is convenient to install; the product adopts an integrated sealing glue process, and can withstand extremely severe mechanical and climate environments on a wagon bogie.

A method and terminal device for distance measurement, the method comprising: a first device sends a first low-power Bluetooth BLE broadcast information, the first BLE broadcast information includes a first fixed frequency extended CTE signal (S101); the first device records a first sending timestamp of the first CTE signal (S102); the first device receives a second BLE broadcast information sent by a second device, the second BLE broadcast information includes a second CTE signal; the first device records a second receiving timestamp of the second CTE signal; wherein the first sending timestamp and the second receiving timestamp are used to calculate the distance between the first device and the second device (S103). The method can be used to obtain timestamp information for distance measurement at a relatively low cost.