【摘要】 介绍一台在线测量的激光测长仪的工作原理和特点，测量精度优于１％，可对钢材，电缆、布匹、纸张等产品在生产过程中进行实时长度测量。更多还原

【Abstract】 This paper introduces all on -- line instrument for measuring length by laser, describes its optical and electrical principles, and its characteristics. The measuring accuracy of this instrument is better than 1%. The instrument can be used for measuring the length of venous on -- line metal materials, electrical line, paper and cloth in industrial production.更多还原