虚拟定标计数器在气体活度绝对测量中的应用

中国原子能科学研究院计量测试部所建的放射性气体测量标准是国内唯一的一套标准装置,运行已有10多年,电子学仪器老化严重,急待更新。定标计数器便是这次系统升级的重要内容之一。它是整个装置的终极信号处理设备,因此,它的性能指标会直接影响这次系统升级的成效。利用NI公司通用计数卡PCI-6602开发的多通道虚拟定标计数器同时具有定数计数和定时计数两种定标功能,具有边沿响应快、计数范围大和时钟精度高的特点,完全满足该标准装置的升级要求,自投入使用以来,运行稳定可靠。

Simultaneous Position Estimation and Omnidirectional Camera Parameter Calibration for Multiple Mobile Robots

This paper proposed an algorithm on simultaneous position estimation and calibration of omnidirectional camera parameters for a group of multiple mobile robots. It is aimed at developing of exploration and information gathering robotic system in unknown environment. Here, each mobile robot is not possible to know its own position. It can only estimate its own position by using the measurement value including white noise acquired by two omnidirectional cameras mounted on it. Each mobile robot is able to obtain the distance to those robots observed from the images of two omnidirectional cameras while making calibration during moving but not in advance. Simulation of three robots moving straightly shows the effectiveness of the proposed algorithm.