自记录卡尺是一种较理想的测径工具 ,它能把现场测量的胸径数据及时保存在 IC卡上 ,这既符合现代化高科技信息产业发展的要求 ,同时又减轻了森林调查内外业的大量工作。1　自记录卡尺的工作原理自记录卡尺的简单工作原理 (图 1)是被测树木的直径变化使活动规产生一定的位移而切 Self-record caliper is an ideal caliper tool, which can store the DBH data measured in the field in time on the IC card, which not only meets the requirements of the development of modern high-tech information industry, but also lightens the large amount of domestic and foreign forestry investigations jobs. A self-recording caliper works Since the simple work principle of the recording caliper (Figure 1) is the diameter of the measured changes in the diameter of the movable gauge to produce a certain amount of displacement and cut