auto-collimator-150829103137-lva1-app6891

7/21/2019 auto-collimator-150829103137-lva1-app6891

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AUTO-

COLLIMATOR

by Vamsi krishnaMajeti



PRINCIPLE



….

When a beam of rays coming out from a monochromaticsource of light are made parallel by placing a collimatinglens(source should be at focus point of lens! and ifthese parallel rays are made to fall on re"ector !the raysre"ect bac# and travels in the same path and converges

at the source through the lens (g A.

If the re"ector is tilted by an angle $theta% as sho&n(g ' ! then the re"ected rays ma#es an angle$)theta%(t&ice the angle theta and converges at point

*+.

**+ , ()theta)(f…….&here f is focal length(distancebet&een source and lens.



WORIN! OF AUTO-COLLIMATOR



….

• A cross line target graticule is positioned at the focal planeof telescope obective. &hen the target graticule isilluminated rays of light diverging from the intersectionpoint reach the obective via beam splitter and areproected from obective as parallel . In this mode theoptical system &or#s as collimator.

• A "at re"ector placed in front of obective and normal to theoptical ais re"ects parallel light bac# along their originalpaths. /hey are then brought to focus in the plane of targetgraticule and eactly coincident &ith its intersection. Aproportion of the returned light passes straight through thebeam splitter and the return image of the target crossline istherefore visible through the eyepiece thus operating astelescope focussed at innity.



…

• If the re"ector is tilted for an angle! the re"ected raysre"ect t&ice the angle of tilt and are brought to focus inthe plane of the target graticule but linearly displacedfrom the actual target by )(angle of tilt)focal length.

• /he linear displacement of the graticule image ismeasured by an eyepiece graticule ! optical micrometeror electronic detector system ! scaled directly inangular units.

• Auto-collimator responds only to re"ector tilt.

• Focal length and the eective aperture are the factorsdetermines the basic sensitivity and angular measuringrange.



T"PE#

I. 0hotoelectric microptic auto-collimator

1icrometer adustment is provided for setting !butcoincidence of setting graticule and target image isdetected photo-electrically and sho&s null reading.

ii. Automatic position sensing auto-collimator Angular displacement of the re"ector is displayed on a

digital readout! eliminating any micrometer reading formeasuring . It is used for cramped positions.

iii. 1icroptic auto-collimator

In this a pair of target &ires ta#e place of the pointlight source as it is not convenient to visualise there"ected image of a point and then to measure thedistance precisely



APPLICATION#

1easurement of straightness and"atness.

0recise angular indeing inconuction &ith polygons.

2omparative measurement usingmaster angles.

Assessment of s3uareness andparallelism of components.

1easurement of small lineardimensions.



P$OTOELECTRIC MICROPTICAUTOCOLLIMATOR



MICROPTIC AUTO-COLLIMATOR



AUTO-COLLIMATORACCE##ORIE#

4evelling base

It supports the autocollimator and enables it to be levelled to bring itsais parallel to the surface being measured.

5urface plate stand

A multi purpose stand of heavy duty construction for general bench

use! comprising ground cast iron surface plate ! column and brac#et.5teel re"ector

A re"ector must be regraded as an integral part of any auto-collimatorsystem.

1ounted glass corner re"ector

/his is used in conuction &ith a re"ector carriage and mounted

re"ector for calibrating a surface plate.5teel cube re"ector

It can be used as a general purpose re"ector and for providing a 67degrees angle standard in three planes and for chec#ing perpendiculars.

auto-collimator-150829103137-lva1-app6891

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