This is my project in my university study.
What is Monochromator?
A device aims at measuring the wavelength of the light. There are few parts in the Monochromator, including the incidence slit, 2 parabolic mirrors, Grating, and the Stepper Motor(controls the Grating through the gears).
https://www.lighttrans.com/applications/optical-metrology/monochromators.html
During the measurement, there is an incident light enters the Monochromator Box through the incidence slit, and the light ray reflected at a plane Mirror, Parabolic Mirror 1, a Grating, parabolic mirror 2, and finally reflected out. To find the signal pattern, we need to measure the intensity received at the output slit for different Grating Position(how many degrees rotated compared to horizontal). Then, we may plot the Signal Intensity vs Position graph! Using the graph, we may find the wavelength for that!
Special Device:
- Shaft: With the Gear and the Notched Plate
- Interrupter: Determine whether the Notch meets the Interrupter
Main Point of my Program
In the project, I have designed a measurement program to rotate the grating and to determine the light intensity received at the output slit. After the measurement of the light, there is the data outputted(Grating’s Rotated Position compared to the horizontal vs Light Intensity Received at the Output Slit).
Apart from the measurement program, I have designed a program to allow the user to calibrate the horizontal position of the Grating.
Also, I have designed a program to calibrate the ratio of the Grating Rad rotated value to the Step moved by the Stepper Motor.
Interrupter Program: To ensure that, every time after the rotation ends, the Grating stops at a position where the interrupter receives no interruption
This is a very short description of my project. if you have anything not understandable, please leave the comment below!