We are the only manufacturer & suppliers of alignment autocollimator in India. An Autocollimator is for measurement of angular tilts and an optical alignment telescope is for establishing an accurate line of sight or for measurement of linear shift.
Alignment autocollimator is a combination of Alignment Telescope and Autocollimator.
Principle :
An autocollimator projects a beam of collimated light. An external reflector reflects the beam back into the instrument where the beam is focused and detected. The autocollimator measures the deviation between the emitted beam and the reflected beam. A reflector is used to direct the emitted beam to the Eyepiece Graticule of the Instrument. If the surface on which the reflector is placed is perpendicular to the projected light, the beam is reflected back to its point of origin. If, however, the surface is tilted relative to the optical axis of the collimator, the reflected light is displaced (visualized against a graticule - usually a crossline). Any deviation between the projected and reflected beam is measured against a scale and measured in arc seconds.
A telescope focuses a near and as well a distant object by movement of the focusing lens of the Telescope. The deviation of various objects along a straight line could be established. A cross line target is usually placed at the object locations to measure the deviation of the centre of each object with reference to the Telescope axis.
When an Autocollimator is focused for infinity it functions as an Autocollimator and when the focusing lens is so adjusted to view a target cross line it functions as a Telescope which means in Autocollimator mode the angular tilt could be measured and in Telescope mode the lateral shift of the centre of object could be measured.
The advantage of this Instrument is to measure the angular tilts and the linear shift along the axis of the precision alignment autocollimator or the line of sight.
Focal Length: 163 mm @ 0.5 m to 430 mm @ infinity
Accuracy of line of sight: 50 microns (deviation to a straight line measured in the image plane)
Clear Aperture: 35 mm diameter
Eyepiece focal length: 18 mm (Magnification: 14X)
Measurement Readout: Dual Axis Graticule / Micrometer
Angular Range of Measurement: 10 minutes
Resolution: 1 arc sec (Micrometer), 20 arc sec (Graticule)
Accuracy: 2 arc sec over 1 minute & 10 arc sec over full range
Line of sight accuracy: 50 microns at the graticule/image plane
Shift in the Target position (Resolution chart)
Distances in Meters
0.5
1
5
10
20
Shift in the Target position for 1 div of Micrometer
0.00437 mm
0.00889 mm
0.0475 mm
0.0959 mm
0.1928 mm
Shift in the Target position for 1 div of Graticule
0.087 mm
0.177 mm
0.950 mm
1.919 mm
3.856 mm
Fig: 1 represent Telescope mode where the lens position is altered to focus across line target located at different distances.
Fig:2 represent Autocollimator mode where a collimated light beam is projected out of the Instrument and received back after the reflection from a mirror target.
