Topic: What is Zeiss Ultra Optimeter? Working Principle of Zeiss Ultra comparator, What is Graticule?
Zeiss Ultra Optimeter is an optical comparator.
In optical comparator, a single reflecting surface(Mirror) is used as the optical means. In Zeiss Ultra optimeter we use two reflecting mirrors to improve the magnification. This is the difference.
Let’s see what are the components used in Zeiss Ultra Optimeter.
- Light Source
- Green Filter
- Two Reflecting Mirrors (M1, M2)
- Objective Lens
- Graticule Screen
These are the different components we use in Zeiss Ultra comparator.
Zeiss Ultra Optimeter Working Principle
The schematic diagram of the Zeiss Ultra Optimeter is shown below
- The Light from the light source passes thru the green filter and condenser as shown in the above schematic diagram.
- The function of the Green filter is to allow only the green light and filters the remaining all colours in the light.
- This filtered beam light passes thru the Condenser.
- The function of the condenser is to focus the light to the movable mirror (M1).
- See there are two mirrors. Mirror 1 (M1) and Mirror 2 (M2).
- Where the Mirror 1 is a movable mirror which is operated by the Plunger.
- The plunger is the measuring tip (Contacts to the workpiece to take the deviation ).
- Mirror 2 (M2) is a fixed mirror.
- Once the focused light from the condenser falls on the mirror (M1) and get reflected on to the Mirror 2 (M2) and again reflected back to the Mirror 1 (M1) as you can see it in the above schematic diagram.
- The objective lens will collect this image and projects on to the graticule. [Whatis Graticule? Graticule is a screen is having vertical and Horizontal lines as like graph to create coordinate points)
- This image on the Graticule is observed by the Eye Piece.
By observing the image we can we can compare the actual working Dimension to the working standard. Here magnification plays a crucial role.
How is the Magnification achieved?
The factor of Magnification depends on the distance ” x” and “h” the Focal Length “f”.
x =Distance between the Pivot of the mirror and the centre axis of the plunger.
h = the Vertical movement of the plunger.
f = Focal Length of the Lens
Magnification = (2 X Focal Length X Angular movement of the mirror )/ Plunger Movement
= (2 X f X (δθ) )/ h
= (2f X (h/x) )/h
This all about the Zeiss Ultra comparator
Also Read about other comparators types