An autocollimator is an optical instrument that is used to measure small angles with very high sensitivity. As such, the autocollimator has a wide variety of applications including precision alignment, detection of angular movement, verification of angle standards, and angular monitoring over long periods. The autocollimator projects a beam of collimated light. An external reflector reflects all or part of the beam back into the instrument where the beam is focused and detected by a photodetector. The autocollimator measures the deviation between the emitted beam and the reflected beam. Because the autocollimator uses light to measure angles, it never comes into contact with the test surface.
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Published on Aug 29, Auto-collimator is an optical instrument used for measuring small angular differences. SlideShare Explore Search You. Submit Search. Successfully reported this slideshow. We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. You can change your ad preferences anytime. Upcoming SlideShare. Like this presentation?
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Actions Shares. Embeds 0 No embeds. No notes for slide. Auto-collimator 1. In this mode the optical system works as collimator. They are then brought to focus in the plane of target graticule and exactly coincident with its intersection. A proportion of the returned light passes straight through the beam splitter and the return image of the target crossline is therefore visible through the eyepiece thus operating as telescope focussed at infinity.
Photoelectric microptic auto-collimator Micrometer adjustment is provided for setting ,but coincidence of setting graticule and target image is detected photo-electrically and shows null reading. Automatic position sensing auto-collimator Angular displacement of the reflector is displayed on a digital readout, eliminating any micrometer reading for measuring. It is used for cramped positions.
Microptic auto-collimator In this a pair of target wires take place of the point light source as it is not convenient to visualise the reflected image of a point and then to measure the distance precisely 6. You just clipped your first slide! Clipping is a handy way to collect important slides you want to go back to later. Now customize the name of a clipboard to store your clips. Visibility Others can see my Clipboard. Cancel Save.
An autocollimator is an optical instrument for non-contact measurement of angles. They are typically used to align components and measure deflections in optical or mechanical systems. An autocollimator works by projecting an image onto a target mirror and measuring the deflection of the returned image against a scale, either visually or by means of an electronic detector. A visual autocollimator can measure angles as small as 1 arc-second 4. Visual autocollimators are often used for aligning laser rod ends and checking the face parallelism of optical windows and wedges. Electronic and digital autocollimators are used as angle measurement standards, for monitoring angular movement over long periods of time and for checking angular position repeatability in mechanical systems. Servo autocollimators are specialized compact forms of electronic autocollimators that are used in high-speed servo-feedback loops for stable-platform applications.
Autocollimator -Principle, Types, Application, Advantages, Disadvantages
Autocollimators are optical instruments that measure angular displacements with high sensitivity. They are used to align optical components and measure optical and mechanical deflections. The two main principles used in an autocollimator are a the projection and the refraction of a parallel beam of light by a lens, and b the change in direction of a reflected angle on a plane reflecting surface with the change in angle of incidence. To understand this, let us imagine a converging lens with a point source of light O at its principle focus, as shown in Figure a. When a beam of light strikes a flat reflecting surface, a part of the beam is absorbed and the other part is reflected back. If the angle of incidence is zero, i. When the reflecting plane is tilted at a certain angle, the total angle through which the light is deflected is twice the angle through which the mirror is tilted.