Projector Definition and 50 Threads

Consider an energy eigenstate. We know that measuring the energy of this state we will get the eigenvalue of it as our measurement value. But what is the meaning of the eigenvalues of the projector? Since the projector is Hermitian, its eigenvalue is observable, but how do we measure it?

We have a map ##\phi : M \rightarrow N##, where ##N## has dimension ##n## and ##M## has dimension ##m=n-1##. So we consider the hypersurface ##\Sigma \equiv \phi(M)## picked out by the map. We also have an orthogonal projector, ##{\bot^a}_b \equiv \delta^a_b + n^a n_b##, where ##n## is the unit...

Good morning physicists, I have a small problem, having a sony projector, like all projectors I always have the usual problem of image pollution. I heard a few months ago (but now I can no longer find the link), of a new technology according to which the projector instead of projecting on the...

The projector location in Cinema Theater can be positioned in Top left corner, Center, Top Right corner etc? I mean Can the projector location in a Cinema Theater can be anywhere at the top of the wall? Attached Screenshot.

As a kid I always liked going to the Hayden Planetarium. Stars were projected on the dome that a city kid could only dream of seeing.But that was a long time ago.I went there recently and the projector is gone. They now show movies projected on the dome with some special effects.Don't you...

Summary: calculation a projection lens system for a pattern projector Summary: calculation a projection lens system for a pattern projector Hello, I want to build a small pattern projector. This projector should project a pattern on a wall, which is 200mm away from the projector. The size...

Summary: Got some high quality lenses. hat can I do with them? I acquired some high quality optics from a projector style TV that I took apart for it's mirror and a few other things. I got some high quality lenses though. I'm interested in astronomy and physics demonstrations because it gets...

I need to design a mini projector as a part of a project I am working on. The body of the projector is approximately 7 inch tall and 5 inch wide. I don't know what kind of a lens I need to ensure the projection is sharp and crisp (it is only black and white writing). I know I would need a zoom...

Hello My question has two parts: 1) Why is plano convex lens used in slide projector? Why can't we use simple convex lens in it? 2) Why are two plano convex lenses used in slide projector? Why can't we use only one?Thanks!

Is it feasible to design and construct State of the art Smartphones with inbuilt mini projector device functionality ? As we know there is a inbuilt torch feature in the Smartphones but has limited functionality. If not, Why? Thanks & Regards, Prashant S Akerkar

I have a very very unusual project requirement where I need a pocket video projection with the lowest possible projection angle or "longest possible throw-ratio". It's a pocket DLP projector so goal is to have the beam remain ,as much as possible, almost the same size as the DLP matrix, for a...

The following matrix A is, \begin{equation} A= \begin{bmatrix} a+b-\sigma\cdot p & -x_1 \\ x_2 & a-b-\sigma\cdot p \end{bmatrix} \end{equation} The inversion of matrix A is, \begin{equation} A^{-1}= \frac{\begin{bmatrix} a-b-\sigma\cdot p & x_1 \\ -x_2 & a+b-\sigma\cdot p...

I have some questions about projection lenses and screen brightness. Background I may be purchasing a BenQ PU9730 (http://www.benq.com.au/product/projector/pu9730/specifications/) for use in a large venue, projecting an image 3 x 5.3 metres. The projection booth is 18m from the screen (maximum...

I'm using a film projector as an editor, meaning I run the film slowly and use a low power bulb. I want to minimise any possibility of damaging the films. To view a film I simply look straight into the lens – and I see an inverted image. What I can't explain is why the projected image appears...

Hello, I need some assistance on a current project I'm working on. Here is some basic background information: I am currently trying to use a "makeshift" SLM, spatial light modulator, to impose a diffraction pattern so that when I shine a laser on it, the beam is diffracted into a donut shape...

I have made a smartphone projector. But is has low brightness. How to increase brightness of projector... Help please

from a bit of googling, i realize it's because the frame rate of the camera and the projector are different. however, i have tried recording videos with cameras of 60fps, 30fps and 15fps, and the projector is likely 60 fps. That's why I'm curious about this - which frame rate is faster (the...

I'm trying to determine how bright my projection image will be on a projected surface. I'm struggling to find a formula for this. I'm using (for example) the Canon Rialis projector which is 4500 lumens. I would be using the zoom lens with maximum zoom so the throw ratio would be 7:1. At a...

I am working on a project where I have to project a logo on a very narrow angle like shown below: The projection distance will vary between 6-10 yards and at 10 yards the projected diameter will not be larger than 12inches so the beam angle needs to be less than 5 degrees. The idea is to...

In thinking about what it would take to make a feasible invisibility cloak or holographic disguise or perfect hologram room, I've imagined something that works like this: A light beam "image" is projected onto a device designed to refract or reflect it in all directions, but only 1 color in any...

Hello, I am working on a project in which I want to project a projection back into a slide projector using a concave mirror. The lens of the projector has a focal point of 100mm (and an aperture of 2.8) and I want to have approximately 1 meter space between the mirror and the...

Hello everyone ! i want to make a simple projector using a convex lens, is it possible ? i don't think want to make it as same as the real projector, which using a mirror inside (i don't know for sure, but my senior told that). when i search for some solution in google, i get some, but maybe...

Homework Statement You have paid big bucks to see The Bourne Legacy at the 3-D IMAX theater in Vancouver. Just before the movie is about to begin, the theater staff tell you that the lens for the projector has just broken! You really want to see the movie and decide that it should be simple to...

I am thinking about building a projector screen out of MDF. Here Down Under the available sizes are: http://www.misterplywood.com.au/products/mdf. Building such a screen will be easier than the normal frame with stretched fabric type, but I am concerned about its long-term flatness. So I thought...

I am currently trying to convert an old Sharp XG-NV2U LCD Projector into a spatial light modulator, and have gotten stuck. The panels don't seem to be interfacing with the computer anymore, which is a problem since I want to use them to project diffraction gratings. Using two polarizing...

I have this in my home work and i am not 100% on if i have it right or not A converging lens with a focal length of 25 cm is used to make a slide projector. If the image is to be projected onto a screen 10m away, how far should the lens be located from the transparency? I did it like...

I'm confusing myself trying to explain the pinhole projector (card with pin point hole used to watch eclipses). How many photons are required, or how small a hole could you maintain, to still get the apparent shape in the projection? Why? Obviously only one photon isn't enough to describe the...

Homework Statement You have paid big bucks to see Season of the Witch at the 3-D IMAX theater in Vancouver. Just before the movie is about to begin, the theater staff tell you that the lens for the projector has just broken! You really want to see the movie and decide that it should be simple...

An Operator is defined as P|x> = |-x>, 1. Is P^2 a Projector operator? 2. What are the eigen value and eigen function of P?

A few months ago I wrote this line down, but it does not seem to follow any more. Am I mistaking a mistake now or when I first wrote it down? thanks ( | 0 \rangle \langle 0 | + | 1 \rangle \langle 1 |) \rho ( | 0 \rangle \langle 0 | + | 1 \rangle \langle 1 |) = | 0 \rangle \langle 0 |...

Hi all, Did someone can explain me how this method is working? I know that PAW unifies all-electron and pseudopotential approaches using some transformation operator that is suppose to smooth the true wave function into a auxilary wave function that can easily be represented by a plane...

Let P \in \textbf{C}^{m\times m} be a projector. We prove that \left\| P \right\| _{2}\geq 1 , with equality if and only if P is an orthogonal projector.I suppose we could use the formula \left\| P \right\| _{2}= max_{\left\| x \right\| _ {2} =1} \left\| Px \right\| _{2} and use the fact that...

Consider the matrix A = u v^{\ast } where u, v \in \textbf{C}^{n}. Under what condition on u and v is A a projector?A is a projector if A^{2}=A , so we have u v^{*} u v^{*}= u v^{\ast }. Does this imply u v^{\ast } = I ? And what exactly are the conditions on u and v that they are asking? do...

How do you prove that a projector is normal if and only if it is self adjoint? I know a matrix P is a projector if P=P^{2} and P is normal if PP* = P*P and P is self adjoint (or hermitian) if P= P*. I think I know how to prove that if the projector P is self adjoint then P is normal...

Greetings to all. In my first post, I'll present an idea based on acoustical holography. I intend to design a Holographic projector using sound and laser. The hologram is created by reflecting reference laser light on a vibrating diaphragm matrix. The diaphragms are vibrated by means of...

Consider the matrix A=uv* where u and v lie in C^n (C:complex numbers). Under what condition on u and v is A a projector? I know that a projector is a square matrix P for which P^2= P. Now according to this definition, would that make uv*=Identity. and then u be the inverse of v*? Also...

Homework Statement Find the oblique projector P so where range(P) = range(U) and range(I-P) = range(W) Homework Equations P^2-P = 0 range(I-P) = null(P) The Attempt at a Solution It seems that U and W are complementary subspaces. According to...

A bit about optics. I was wondering what is the film (slide, or motion picture) projector with the widest projection angle. What are the current limitations?

Hello! once again I got trouble with Dirac-notation: Homework Statement Given an non-orthonormal basis. Measurement via the projection operator should not give an definit answer, in which state the system was due to the overlap. Geometrical that's clear, but I'm unable to compute that...

Hi there. If there is to be a back projector system behind a screen (such as a car instrument panel), in order for the information to be displayed in the correct sequence I'm thinking some sort of horizontal/convex lens will need to be used in order to invert the information in the horizontal...

Hi. It asks to calculate the focal length range of a projector of square pixel SXGA is from 4 to 12 m from the screen. It gives the diagonal size of the display (in mm) as well as the horizontal size (in m). The thing that am not sure about is how the focal length would be calculated with the...

Here is the weird thing... when my computer is connected to my video projector (epson movie mate 30s) it will do widescreen as it posts but as soon as it gets to windows it locks in a 4:3 ratio. What gives here? I've scanned my video card settings for some sort of toggle but can't find any...

I have to find a basic design which includes a device for a raising a slide projector to the proper angle for projection on screen.It may be part of the original projector or an accessory to be attached to existing projectors. If you help me finding it i will be grateful because i could not finf...

“Holographic” projector? Any idea how it works? I saw this a couple of years ago. It’s a projector that’s able to display 2D images or simulated 3D video into the air. Here’s the manufacturer’s site: http://www.io2technology.com/ The site has a few really neat videos. Any idea how this is done?

For a class, I need to design a basic overhead projector. I know a little bit about optics from an algebra based physics class I took a while back, but I don't remember most of the specifics, such as what kinds of lenses flip objects before and after their focal points. I'm also not sure what...

hi, i am in need of help pretty quickly here.i will have to design a projector design using a fresnel lens and the projection lens.i need to find and derive the equations for the lenses and calculate the distances between the lenses and the lens and the screen. this is what i require to have ...

hi, i am in need of help pretty quickly here.i will have to design a projector design using a fresnel lens and the projection lens.i need to find and derive the equations for the lenses and calculate the distances between the lenses and the lens and the screen. this is what i require to have...

hi, i am in need of help pretty quickly here.i will have to design a projector design using a fresnel lens and the projection lens.i need to find and derive the equations for the lenses and calculate the distances between the lenses and the lens and the screen. this is what i require to have...

hi, i am in need of help pretty quickly here.i will have to design a projector design using a fresnel lens and the projection lens.i need to find and derive the equations for the lenses and calculate the distances between the lenses and the lens and the screen. this is what i require to have...

I saw some discussions about projectors in some threads. Also, the projector is used in this book to define pure state but did not provide what is a projector. http://www.math.sunysb.edu/~leontak/book.pdf Thru some math. check by assuming TR AP_\psi = (A (\psi) , \psi ) ( In this...