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一、前言研制TGC-300型光学测树仪的目的,是为改进在树种选优和森林调查工作中进行爬树或砍树的测树方法,以减轻体力劳动、提高工效和节约林木资源。在研制设计中,本着“洋为中用”的方针,对国外光学测树仪(分为光叉式、短基线视距仪式和轮尺式三大类)的研制发展概况和其中有代表性的速测镜、巴尔—斯特劳德测树仪与惠勒五棱镜轮尺的基本原理及主要优缺点进行了学习分析。认为五棱镜轮尺具有结构简单、用平行视线观测
I. Introduction The purpose of developing the TGC-300 optical tree-measuring instrument is to improve the method of tree-climbing or tree-cutting in tree selection and forest investigation in order to reduce manual labor, improve work efficiency and save forest resources. In the research and design, based on the principle of “foreign being the middle use”, this paper summarizes the research and development of foreign optical tree measuring instruments (divided into optical fork type, short baseline sight length type and caliper type) The basic principle and the main advantages and disadvantages of the sex-fast goniometer, Barr-Stroud tree-measuring instrument and Wheeler pentaprism caliper were studied and analyzed. Pentagonal caliper that has a simple structure, with parallel line of sight observation