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1.
陆保国  袁杰 《计算机工程》2011,37(14):97-99
环境和硬件本身等因素使无线传感器网络的定位精度受到影响。为此,通过三维空间定位过程的分析,提出基于接收信号强度(RSSI)测距和Gauss模型的RGM定位算法。该定位算法无需硬件的扩展。仿真实验表明,相比普通的基于RSSI的测距算法,该算法可提高定位精度、缩短响应时间。  相似文献
2.
Recently, there has been high demand on miniaturizations of bio-instruments and wide range gas flux measurement in the field of chemistry and mechanics. This paper presents the design, fabrication, and characterization of a silicon-glass-based thermal distribution gas flow meter (20 mm × 10 mm × 1.6 mm) with a wide detection range. To facilitate the fabrication and maintain the stability of the sensor, a platinum (Pt) thin film was adopted as the heater and thermometers. Both the thermal property and temperature sensitivity of Pt thin film were characterized. SiO2 passivation layers were deposited on top of the Pt film to prevent thermal and electrical shift of sensitive elements. Three pairs of thermometers were constructed beside the heater. Sensitivity and gas flux range of the gas flow meter can be increased by alternate use of these three sensor pairs. We also introduced a specific hardware control circuit system for real-time gas flux monitoring through the connection with a computer interface. The proposed gas flow sensor device was capable of measuring gas flux within the range of 0.8-2800 ml/min, thus demonstrating the potential for a wide range of applications.  相似文献
3.
介绍一种以单片机ATmega16为核心的超声波测距仪。该测距仪利用单片机ATmega16的输入捕获功能,测量超声波从发射探头发射至接收探头接收所经过的时间;采用DS18820测量环境温度,补偿温度的变化对超声波传播速度的影响,提高测量精度;利用语音芯片ISD4004播报测量结果等语音信息。给出了测距仪的关键硬件电路、测量时间的输入捕获中断子程序和录音/放音子程序。测试结果表明,该测距仪测量精度高,语音播报清晰、流畅。  相似文献
4.
徐斌 《传感技术学报》2013,26(5):666-669
利用超声波进行距离测量有着成本低、测量精度高的特点,因而在非接触距离测量中有着广泛应用。然而超声波换能器在接收低频信号过程中需要完成一个较长时间的起振过程,在短距(10 cm)测量场合中起振延迟在超声波飞行时间测量中占比可达50%以上,严重影响了超声波真实飞行时间的测量精度。本文提出了考虑超声波换能器延迟误差的距离测量公式,结合最小二乘法对超声波飞行距离、换能器延迟时间、温度和器件距离等参数进行了精确校准。在实验中,采用24.5 K超声波脉冲,使用基于到达时间差TDOA(Time Difference of Arrival)的方法对所提出方法进行了验证。实验证明,该方法在保证精度不丢失的情况下,避免了在不同环境温度下的多次采样和校准,解决了最小二乘法在低频超声波短距测量中可能存在的参数校准困难,对于各类短距离测量应用有较好的精度提升效果。所提出的测量和校准方法算法简单、实施方便,可基本满足各类短距测量需求。  相似文献
5.
基于Zigbee通信技术的无线传感网是最具应用前景的一种网络模式,定位信息对网络数据有重要的辅助作用。文中提出了一种基于接收信号强度指示( RSSI)值的无线Zigbee传感网测距定位技术,从理论上提出了基于RSSI的节点测距定位处理算法,并从实践上提出了CC2530测距定位模块实现方式。最后通过在实验室环境的实际距离与RSSI值的测试,得到了RSSI值与无线通信距离之间的实验结果,通过最小二乘法进行曲线拟合,得到了RSSI测距的实测公式。  相似文献
6.
王峰  葛立峰 《微机发展》2008,(1):229-231
介绍了超声波测距的原理,分析了超声波测距产生误差的原因,设计一种高精度超声测距系统。提出通过确定回波前沿以计算渡越时间,实时测量环境温度修正超声波传播速度,以提高超声波测距精度的方法。在此基础上,设计了超声波测距系统的硬件和软件。实验结果验证了本系统具有精度高的优点。  相似文献
7.
介绍了超声波测距的原理,分析了超声波测距产生误差的原因,设计一种高精度超声测距系统.提出通过确定回波前沿以计算渡越时间,实时测量环境温度修正超声波传播速度,以提高超声波测距精度的方法.在此基础上,设计了超声波测距系统的硬件和软件.实验结果验证了本系统具有精度高的优点.  相似文献
8.
A three-dimensional hand-eye system has been specially developed for handling, forming, and inserting flexible wires in electronic assemblies. The system consists of a vision system capable of measuring three-dimensional positions and a gripper capable of microforce control. The hand-eye system performs its tasks based on visual and force sensor data.The vision system uses a camera, a multiplanar laser light projector, and a video-rate image processor to measure the three-dimensional position of a flexible wire on a complex background. The projector consists of multiplanar light beams and a single-planar light beam and is robot-mountable. The single-planar light is used to simplify the matching of the multiplanar light beams and projection images. This is one of the most important features of our method. The measurement time is within 1.2 s for 20 positions on the wire, which is less than one robot cycle. The measurement accuracy is better than 0.2 mm in the plane for a 100×100 mm scene and is better than 1 mm perpendicular to the plane for a depth of 500 mm.The microgripper has 3-axis sensors capable of detecting three types of forces: grasping, pulling, and pushing. The dynamic range of the grasping force is 0.005 to 0.6 N, enabling high-resolution control. Two piezoelectric actuators are used in the microgripper fingers and a 3-mm stroke is achieved by amplifying the actuator's displacement using a two-stage lever.This system has been used for wire handling in magnetic disk slider manufacture, which is a difficult and delicate task. Measurement, grasping, and upper-stage insertion had a 100 percent success rate using autorecovery, making the hand-eye system feasible. This paper discusses design concepts, the range measurement principle, the system itself, and wire-handling applications.  相似文献
9.
Shoemaking is one of the areas where CAD/CAM application is rapidly increasing.Thispaper introduces an integrated computer aided shoemaking system including human foot measuring,last(wooden model)measuring,last CAD/CAM and pattern CAD/CAM.The project was supported bythe 7th national economical 5 year plan.High technologies,suh as digital image processing,patternrcognition,advanced geometrical modeling and a series of sophisticated equipments and devices are ap-plied in this integrated system.Parts of the system have become commercial products.  相似文献
10.
A novel, simple and efficient method for vision based range measurements with uncalibrated cameras is presented. Required parameters are the image size, the relative distance between two different image frames of the same scene and the field of view of the camera(s). Range measurements acquired using ultrasonic sensors and a vision system have been used to navigate a mobile robot around known colored obstacles in an indoor environment. Both sonar sensors and cameras are activated and they operate simultaneously in parallel to obtain range measurements from common search areas located in the front of the mobile robot. Experimental results using a parallel stereoscopic, rotated and monocular vision system with uncalibrated cameras confirm that the maximum computational error (as well as the normalized root mean square error) of range measurements using the vision system for obstacles lying at a distance of 27–800 cm from the robot, is smaller compared to other similar, even more advanced and state-of-the-art existing approaches, reported in Rajagopalan (IEEE Trans. Pattern Anal. Mach. Intell., 28(11): 1521–1525, 2004), Mudenagudi and Chaudhuri (Proceedings of IEEE International Conference on Computer Vision, 1: 483–488, 1999), Umeda and Takahashi (Proceedings of IEEE ICRA, pp. 3215–3220, April 2000), Jiang and Weymouth (Proceedings of IEEE CVPR, pp. 250–255, June 1989), Lai, Fu, and Chang (IEEE Trans. Pattern Anal. Mach. Intell., 14(4):405–411, 1992), Malis and Rives (Proceedings of IEEE ICRA, pp. 1056–1061, 2003), Derrouich, Izumida, and Shiiya (IEEE Annual Conference on IECON, 3: 2191–2196, Nov. 2002).  相似文献
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