In response to the difficulty of measuring volume in the energy efficiency rating evaluation of refrigerators,a combination of structured light and binocular vision measurement technology was used for experimental verification.Among them,structured light uses speckle structured light to calibrate the scanner,and calculates the volume by denoising,smoothing,and extracting edges from the col-lected data.The results show that the 3D scanning measurement accuracy of this method meets the measurement requirements,but there are problems such as insufficient depth measurement of the scanner at the turning point of the refrigerator,and the need to paste a large number of marker points in areas with unclear features to achieve image stitching.
In dynamic temperature measurement, thermocouple sensors are widely used, and their dynamic characteristics directly affect the accuracy of the test results. So before applying thermocouple sensors to dynamic temperature measurement, their dynamic characteristics should be obtained, and their dynamic performance parameters should be analyzed. The time constant is the most important dynamic parameter, which reflects the response speed of a thermocouple sensor. Therefore, it is necessary to measure the time constant. The time constant is closely related to the heat transfer mode, so the heat transfer environment of the time constant measurement system should be similar to the application environment of thermocouple sensor. When using the thermocouple to measure the temperature in various kilns, the heat transfer is mainly through the radiative mode, and existing equipment, such as constant temperature water/oil tank, shock wave tube and other devices, cannot be used to measure the time constant to reflect scenarios in actual measurement applications. Therefore, this paper proposed a new method to measure the time constant of the thermocouple by improved high temperature furnace. In the system, the high temperature furnace was used to generate the stable temperature field, and the fast feed device was used to insert the thermocouple into the high temperature furnace and generates the ramp temperature excitation. The temperature can reach 1500 °C in the furnace, and the temperature error in uniform temperature field is ±1 °C. Finally, the time constant of a K-type thermocouple was measured, and the uncertainty of the measurement result was analyzed.
In view of the problems that the geometric parameters of circular saw blades mostly rely on manual labor,low detection efficiency and easy to produce manual errors,this paper adopts improved Hough circle detection algo-rithm and connected domain method to detect the inner diameter,outer diameter,tooth height and tooth number through image acquisition,preprocessing,system calibration and edge detection.The experimental results show that the proposed algorithm is not only feasible but also has low error and high detection rate.
为适应现代化武器装备的新特点,符合作战新要求,应解决装备计量管理中与联合作战体系、联合保障体系不相容的问题.本文对军事装备计量领域存在的问题进行梳理,并分析计量平台对军事计量发展的重要意义.同时,使用区块链技术,设计搭建装备伴随计量平台,并构建数据分析模块,确保装备技术参数量值的准确统一、试验结论的真实可靠.实验证明:装备伴随计量平台建设可促进战斗力的提升,对装备计量数字化智能化发展具有重要意义.
本文介绍了在海思平台上实现基于深度学习的目标检测系统.首先通过前端摄像头采集视频数据,采用YOLOv5对海思芯片内部视频预处理后的视频数据进行目标检测,再将检测结果和压缩后的视频数据通过网络传输至客户端显示.实验证明:该系统可为多目标跟踪提供检测数据,在嵌入式安防监控领域具有广泛的应用前景.
