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Autocollimator & Accessories

Model No: HO-OI-AC3

Autocollimator is a versatile non-contact optical instrument for measurement of small angles or tilt movements with very high sensitivity. Holmarc manufactures precision visual autocollimators as well as electronics autocollimators as standard products and these instruments find multitude of applications in shop floor as well as metrology labs for precision measurements of straightness, parallelism, perpendicularity and flatness.

Autocollimator projects the image of anilluminated reticle to the object under inspection and receive the reflected image from the object. In visual autocollimators this reflected image of reticle will focus at the position of fixed reference cross wire. Shift in reflected image compared to the fixed reference cross wire represents angle. A dual axis linear stage driven micrometers carry the fixed cross wire near the eyepiece of the instrument. Operator can determine shift and hence the angle by moving the fixed cross wire and aligning it with the reflected reticle image. Graduations on the micrometer give angular measurements directly in arc seconds.

In Electronic autocollimator, the reflected image of reticle will focus on a CMOS camera. The software calculates the shift in reflected image and shows the corresponding angles in seconds, minutes or degrees.

In most cases, the object under inspection may not be having reflective surfaces. In order to carry out inspection, operator needs to fix a plane mirror on the object for reflecting the image back to the instrument. Holmarc supplies a front coated mirror along with kinematic mount as a standard accessory.

Holmarc’s autocollimator has stainless steel body and high precision optics with LED illumination. A kinematic stage with two axes tilt movements hold the instrument on horizontal plane. Different types of accessories are also provided for performing different applications. Customer can choose the required accessories from the optional accessories list.



Features

    High accuracy Angle measurements.

    Non-contact measurement.

    Repeatable Measurements.

    LED illumination.


    Model     HO-OI-AC3     HO-OI-AC1     HO-OI-EAC
    Readout     Micrometer     Micrometer     Software
    Measurement axis     Dual (X, Y)     Dual (X, Y)     Dual (X, Y)
    Resolution     3 arc seconds     1 arc seconds     0.79 arc seconds
    Accuracy over full range     30 arc seconds     10 arc seconds     7.9 arc seconds
    Measurement Range     ± 0.5 arc minutes     ± 20 degree     Horizontal = ± 17 arc minutes
    Vertical = ± 12.5 arc minutes
    Field of view     1 degree     40 arc minutes     Horizontal = 34 arc minutes
    Vertical = 25 arc minutes
    Clear aperture     30 mm     35 mm     30 mm
    Reticle illumination     Green LED - Variable intensity


    Standard Accessories :-
    1.    Horizontal alignment stage
    2.    Plane parallel mirror with mount.
    Optional Accessories :-
    1.    Right Angle Prism
    2.    Penta Prism
    3.    V prism with Flat Mirror and Cross level
    4.    Mirror with Mount and base plate
    5.    Tripod
    6.    Transparent Wedge
    7.    Penta Prism with Wedge
    8.    45 degree mirror with mount
    7.    Polygon Mirror with mount
    8.    Vertical stand with height adjustment & 3 axis freedom for alignment

Example of Application



1.    Pitch and yaw measurement using Autocollimator


2.    Squareness measurement between a vertical spindle and a machine bed


3.    Parallelism measurement of cylindrical bore holes

Applications in Mechanical Engineering / Tool Room


    Measurement of parallelism of two surfaces

    Measurement of perpendicularity of two surfaces

    Parallel setting of rolls

    Pitch and yaw measurement of slides

    Measurement of roll-angle

    Straightness Measurement

    Flatness Measurement

    Squareness measurement between a vertical spindle and a machine bed

    Parallelism measurement of cylindrical bore holes

    Testing of accuracy of rotary tables and index tables

Applications in Optical Engineering / Optical Industry


1.    Testing of parallelism with Collimator and Telescope

2.    Testing of opaque wedges and plane parallel plates

3.    Testing of transparent wedges - evaluation by double cross

4.    Testing of transparent wedges - evaluation by reference mirror

5.    Testing of transparent wedges - simultaneous determination of wedge angle and refractive index

6.    Testing of transparent wedges - evaluation by angular deviation

7.    Testing of the 90° angle of a 90° - glass prism

8.    Testing 45° angles of 90° - glass prism

9.    Relative measurement of angular error of prisms

10.    Testing of camera objectives

11.    Radius measurement of concave spherical surfaces

12.    Radius measurement of convex spherical surfaces

13.    Measurement of focal length of lenses and optical systems

14.    Measurement of back focal lengths of lenses & optical systems

15.    Measurement of the centration error of spherical surfaces

16.    Measurement of centration error of lenses in transmission using Collimator and Telescope

17.    Measurement of centration error of lenses in transmission using Autocollimator and Mirror

18.    Flatness testing of reflecting surfaces using collimator & telescope

19.    Flatness testing of reflecting surfaces using an Autocollimator

20.    Control of wedges and plane parallel plates



Vertical Stand with height adjustment and 3 axis freedom for alignment



Autocollimator with Vertical Stand (Height adjustment and 3 axis freedom for alignment)



Universal stand for Aotocollimator



Tripod

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