Newton rings. Newton's rings : Experiment, Theory 2022-10-06
Newton rings Rating:
Newton rings are a type of interference pattern that is formed when light waves reflect off the surface of a lens or other transparent object. They are named after Sir Isaac Newton, who first observed and described them in the 17th century.
The basic principle behind Newton rings is that when light waves reflect off the surface of a lens, they interfere with one another. This interference can either reinforce or cancel out the waves, depending on the phase difference between the waves. When the phase difference is such that the waves reinforce one another, a bright ring is formed. When the phase difference is such that the waves cancel each other out, a dark ring is formed.
Newton rings are often used in scientific and technical applications to measure the surface flatness of a lens or other transparent object. To do this, a lens is placed on top of a flat surface, and a light source is shone onto the lens from below. The resulting interference pattern can then be used to determine the shape of the lens and any deviations from a perfectly flat surface.
Newton rings can also be used to study the properties of thin films, such as their thickness and refractive index. By measuring the spacing between the rings in the interference pattern, it is possible to determine the thickness of the film. Similarly, the refractive index of the film can be determined by measuring the angles at which the rings appear.
In addition to their practical applications, Newton rings are also a popular subject in demonstrations and demonstrations of optics. They are a simple and visually striking way to demonstrate the principles of wave interference and the nature of light.
In conclusion, Newton rings are an important and versatile tool in the study of optics and light. They have a wide range of practical applications, and are also a popular subject for demonstrating the principles of wave interference and the nature of light.
I spent a good half hour trying to do something and, well something's not clicking. Cheers Hi Jaxon Wow, those are really good results! No need to get upset with each other in such a situation. With this capability, the components such as the Gaussian beam of laser and interferometers can be accurately modeled and incorporated into a system that is optical. A similar analysis for illumination of the device from below instead of from above shows that in this case the central portion of the pattern is bright, not dark, as shown in Fig. It would actually help to post up some pictures of the cards you are using as a reference to the damage caused by the plastics so that the OP can compare his card to yours. This results in a pattern of concentric bright and dark rings, interference fringes. The glass plate reflects a part of the incident light vertically downwards, normally on the thin air film, enclosed by the plano convex lens L and plane glass plate P.
I contacted customer service and they aren't going to do anything for me, as they said it's called newton's rings and it's normal. Theory and Equations Consider a ray of light incident on the air film at a point where its thickness is t. At first, light falls on a glass plate inclined at an angle of 45° to the vertical before reaching the lens-plate system at the bottom. At positions where the path length difference is equal to an even multiple 2n of a half-wavelength b , by 2 the reflected waves cancel, resulting in a dark spot. In the monochromatic example, the source of color is a monochromatic single source of light shining through the top piece and refracting off the bottom and top surfaces.
Concept of Newton’s Rings for Engineering Physics childhealthpolicy.vumc.org 1st Year
Maybe then I can figure out what is being done. The radii of bright and dark circles can be found by considering the figure. Chuck Here: Edited by chemman, 23 May 2021 - 08:45 PM. The frequency domain shows how the image is composed of different frequencies. FRED generally is said to be allowed for simulation of physical optics phenomena such as diffraction and interference.
I tried a defocused and a trashbag flat but the little rings remained. I ended up with a big blurry image when I did an Inverse FFT. In Necsoiu, Teodor; Robu, Maria; Dumitras, Dan C eds. Would you be happy with that response? The result looked like a moisture spot within the holder, when in reality it was completely free of moisture. Some of its applications are as follows.
Newton’s Rings: Understanding the Encapsulation Illusion
At the point of contact of the lens with the glass plate, the thickness of the air film is minimal compared to the wavelength of light. Just the way it is. In the context of scanning Polaroid photos, they are visible as concentric circular alternating bright and dark, sometimes very colorful rings on your digital scan - see examples below. . I dropped an image into the program and played around a bit and I found the FTT function and that "flat" window popped up but that's about where I lost it.
Useful Aside: The FFT gives you back the image transformed into the frequency domain. Marty, Should the tilt adapter be directly attached to the camera or attached to the Barlow T2 100mm up the light path? The two sides of the Card Saver are pressed together in the packaging process and have a slight curvature straight out of the package. The only solution is better cases, better procedures, and better QC. Very best, Edited by MalVeauX, 30 July 2020 - 04:18 PM. The thickness of the film is zero where the lens and the plate are in contact with each other.
I played with your image as well. So, I'm having a hard time figuring out what exactly the Newton rings are here. The optical path difference between the two reflected rays will be 2t. You have a lot more experience getting comics graded than I do, and I have no reason to doubt your estimate of about 10% of CGC-graded comics being received with some kind of issue related to encapsulation. IMO, it is easier to start with the best raw images rather than deal with uh-ohs later on.
Depending on the thickness of the air gap between the lens and the base, the path of difference between the ray that is reflected and the ray which is incident is different. The additional path length is equal to twice the gap between the surfaces. I'm just basing this off my experience with Newton rings which is caused by plastic on plastic, and that does indeed look like oil on water, that very well could be the case here, but more evidence is needed, your pictures could help. Ideally remove it in acquisition this is covered in my tutorials either via real time flat overly in FireCapture via defocus or via a diffuser. For your video, you might consider making a finalized image and then apply NR removal.
If you had a large picture of a striped shirt, you might think you'd see a specific frequency of how often those stripes occur and you would be right! To their credit, I was told that CGC will offer a complementary reholder if photos are emailed to submissions cgccomics. We want to stop this from happening. The parallel beam of light emerging from L 1falls on the glass plate G kept at 45 o. Inspect the resulting image. Part II—New interference phenomena with Newton's rings". Here, the card itself is one of the surfaces creating the Newton ring contact.