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从侧视式孔内电视系统视场角恒定这一原理出发，从理论上分析了利用该电视系统能够直观而又简便地测量计算出井孔的井径，并在实验中得到了证明．
Starting from the principle that the view angle of the television system in the side view hole is constant, the hole diameter of the wellbore can be measured and calculated intuitively and conveniently using the television system, and the experiment is proved.