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二、工业电视的基本原理 (一)摄象机部分Ⅰ摄象机的主要器件1.光学镜头工业电视摄象机要摄取的各种图象,首先必须由光学镜头将其光图象清晰的投影在摄象管靶面上。摄象机所用光学镜头质量的优劣,直接影响电视图象的质量,因此对光学镜头要有一定的要求。(1)镜头相对孔径这是镜头焦距与通光孔径的比值 D/f,如1:2、1:1.6等。比值越小,通光越大。对于希望摄象机的光学灵敏度高的机器,如微光电视、X 线电视等,就用1:0.75的镜头。一般工业电视用的光学镜头,用1:2或1:1.6
II. THE BASIC PRINCIPLES OF INDUSTRIAL TELEVISION (I) Camera Part I Main Components of a Video Camera 1. Optical Lenses Various images to be taken by an industrial television camera must first be optically imaged by an optical lens Projection in the tube target surface. The advantages and disadvantages of the quality of optical lens used in the camera, a direct impact on the quality of the television image, so the optical lens to have certain requirements. (1) the lens relative aperture This is the lens focal length and aperture ratio of the ratio D / f, such as 1: 2, 1: 1.6 and so on. The smaller the ratio, the greater the light. For machines with high optical sensitivity, such as microdisplay, X-ray, etc., cameras with a 1: 0.75 lens are desirable. General industrial television with optical lens, with 1: 2 or 1: 1.6