Recent content by Gifty01

Hi all, I will like to measure the MTF of a lens experimentally. In the set-up, I have my light - target - lens - camera. When my object (target) is at the focus of the lens, I took an image. My question now is, to I move my object across one pixel or few pixels or to move my object across...

Summary:: I have a fibre coupled LED light and an achromatic doublet lens, I know by placing the collimating lens at a distance equal to the focal length of the lens, the light will get collimated. But is the a simulation software available where I can input the parameters I can so as to...

Thanks for your response sophiecentaur. The diffraction is due to the size of the aperture. I am not so good in coding. I wrote a bad code with MATLAB which takes a lot of time to run completely. the graph showing the plot of COG against spot position was the plot I obtained, which shows that...

Hi all, I will like to simulate diffracted spots at least two spots, on a camera. I will be glad if someone can help out with a code. below are the details required: camera pixel size = 4um (each pixel can be sub divided for better calculation), gap size = 100nm, camera length = 4000 x 4000...

I measured the center of gravity (COG) of the different spot position at different distances on the camera sensor after diffraction. but I noticed different behaviour of the COG calculated for the spots. they behaved differently at the edges.

Hi all, I have a system whereby, there are different aperture shapes which are: circle, triangle, square e.t.c. this apertures are all 300um in diameter. I will like to know if the encircled energy calculated for the different apertures after diffraction will be different due to different...

Thanks a lot twigg. I really appreciate.

Thanks for your response. Kindly find attached the error that occured.

Thanks for your response. Is there a software in which I can just import the images and calculate the average as well as the std. Or I need to write a code? normally, I am not really good in coding. and I am newly learning how to use matlab. If it requires some code, I will be glad if an example...

Thanks for your response

How can I subtract the camera noise from my real image? Basically, I want to calculate the center of gravity of a diffracted spot without the influence of my camera noise. I will be glad to know how this can be done.