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Questions tagged [optics]

Optics is a branch of physics describing the behaviors and properties of light (electromagnetic waves). Questions regarding the properties of light, it's interactions with matter and the instruments used to detect and deflect (or concentrate) light should be posted here.

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Inline thickness measurement by optical transmission (Beer-Lambert law)

I am wondering how effective would be an inline system for thickness measurement of diffuse plastic samples based on light attenuation. Sample thickness woud be in the order of a few mm. I know that ...
gioarma's user avatar
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Can I increase the field of view of a lens+camera system by placing a meniscus lens in front of it?

Let's say I have a camera + lens system. The lens is a standard focal length, let's say 25 mm on a 1/2" sensor, so not wide angle. Instead of mounting a wide angle lens on the camera, would it be ...
gioarma's user avatar
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Optical element that selectively attenuates a wavelength band without completely blocking it

I am looking for an optical element that would allow me to selectively attenuate a given wavelength by a factor of let's say between 2 to 5 without attenuating any other wavelength. I know that notch ...
OpoL's user avatar
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1 answer
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Optics zoom lens elements

How would I go about designing an optical zoom lens configuration that gives me around 25x zoom eg 10mm to 250mm within a package of roughly 100-150mm? Is there a good software or calculator/optimiser ...
user94863's user avatar
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Selecting Spectrometer Slit Size

I am sourcing a new spectrometer for my optics lab and I am wondering how to determine the slit size. They offer 10um, 25um, and 50um slit sizes with decreasing resolution as we go larger. I want to ...
ImpressionableEE's user avatar
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Optical table without holes

Most optical tables have holes. Are there also optical tables without holes? Or do these things have a different name?
Riemann's user avatar
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Single Photon/Electron Emitter

Is it possible to buy single photon/electron emitter in market for experimental purposes? If yes, can you please guide me where and how?
Ok-Virus2237's user avatar
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1 answer
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Is there a retroreflector prism that makes incident and reflected beams collinear?

I have an application where I need to preserve the angle of incidence of a laser beam. So, I am looking at retroreflector prisms. However, the only ones that I can find translate the incident and ...
Anthony K.'s user avatar
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Transferring image from one window to another

As per the diagram shown, my inside window looks out on a shared hallway, not the outside. Using mirrors or optics, I would like to be able to see the tree and sun from inside. I can't alter the ...
Matt's user avatar
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Tunable phase delay for RF modulation

I've been trying to understand if there's a way to create two RF signals at the same frequency with a fixed, tunable phase delay. The goal is for one to trigger an RF-modulated laser and the other an ...
magnetochiral's user avatar
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What is the meaning of labels on the lenses, e.g. 12L and 12H on Computar M0814-MP2?

Computar M0814-MP2 lens comes with small labels attached, e.g. 12H, 12L or 15H: What is the ...
Paul Jurczak's user avatar
2 votes
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collapsing a telescope image cone into an optical fiber

I have an application where a telescope will be receiving light from a laser source, and I need to couple the output, which is the image cone, into an optical fiber. Does anyone have any suggestions ...
Anthony Knighton's user avatar
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Can air be implemented in 1-Dimensional photonic crystals?

As far as I am aware, digging holes in nanostructures or using columns of materials in a medium of air is the main way by which 2D photonic crystals work. I thought it would also be common to ...
Dead Scissors's user avatar
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Is it possible to make a isometric camera IRL?

In theory, all you need is a large sensor and a way to focus parallel light - without any sort of converging point.
Adriano Bezerra's user avatar
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1 answer
82 views

Thermal cameras - what is the practical significance of NEDT in relation to accuracy?

(Hi, I put this question on the elec eng. stack exchange and someone suggested I move it here. This question has also been edited to make the actual question clearer and fix an error). Using accuracy ...
Shara's user avatar
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What is the purpose of glass element?

I've seen video about range finder and interested in purpose of one of element. Rangefinder works at 120 GHz and annotation in video says that it is glass lens and its purpose is to bend radiowaves ...
user42240's user avatar
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Diffusor for uniform illumination

I have an LED with a beam angle of 120° and I need to illuminate an area in the shape of a circle with a radius of 3.5 mm. My objectives are as follows: Achieve a uniform illumination of the circle (...
WitheShadow's user avatar
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How to translate/interpret lens patent's aspherical equation into more common form

I am trying to define a lens inside of optical software from a patent. The spherical elements are no problem, but the aspherical element defined in the patent seems to follow a form I'm unfamiliar ...
polyrhythm's user avatar
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What components should I use for a high-power (5kW) projection system, which projects a binary pattern onto a 250x250mm surface(pixel size of 0.05mm)!

For a machine, which I am currently designing I need a very high-power projection system. I have been trying to make a rough concept over the last few days, but have gotten stuck, because I got a bit ...
Engineer_2005x's user avatar
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Manufacturing/Production of Spherical Lenses

How are spherical lenses cut out using a diamond tip? In this video, the lecturer says: Take a piece of glass, mount it on a rotary stage. Then bring a diamond tip near the glass and start rotating ...
StefanH's user avatar
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Measure a 5cm Cube's displacement with sub-micron accuracy within a small position uncertainty 20cm away

The 5cm cube in the question is a place holder in terms of geometry for what we want to track and measure its displacement. The problem is quite simplified with that we know already the cube is put in ...
Alejandro's user avatar
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How can I build a periscope window into a house, maintaining a high quality image at reasonable cost?

My family owns a plot of land on the top of a hill. AT the bottom of the hill is a lake. Between the plot and the lake is a house that completely blocks the lake view. However, it is only 10 or 15 ...
J Andrew Hoerner's user avatar
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3 answers
83 views

How simultaneous can we trigger multiple cameras' frame acquisition

Say we have ten cameras surrounding an object. The object changes its color with a certain frequency (or any information other than color, such as a text on it). The point is if all cameras are ...
Alejandro's user avatar
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Is there any small laser tracker optimized for small workspaces

A conventional laser tracker is usually large, but allows measuring up to a couple of meters away with great accuracy. However, if we are only interested to measure a target that is only a few ...
Alejandro's user avatar
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3D displacement measurement of a small object with sub-micron accuracy

Say we have a small object for which we can choose its geometry and material (e.g, a spherical mirror with 5mm diameter). Or alternatively a point wise light source generating spherical waves. The ...
Alejandro's user avatar
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What is the simplest way to melt an area of plastic powder with light?

I want to melt a 10cm^2 area of nylon powder (melting thickness of 50 microns), and once melted it becomes a solid sheet of plastic. I can only use light radiation to melt this area, not conduction or ...
Davide Radaelli's user avatar
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45 views

How can I make a 48x microscope with combination of lenses?

As part of a project I need to make a device that can give me 48x magnification of nearby objects. Can someone guide me on how to practically approach this problem, i need to be able to take pictures ...
SniiKz089's user avatar
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How to get a clear Fourier plane image using convex optical lens?

I am trying to get a view of the Fourier optics plane using home apparatus as follows: I am able to get the inverted image easily by adjusting the distances just right, but I am never able to get a ...
James's user avatar
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How can I transport sunlight (with UV, IR etc...) across space?

I currently have a tiny vertical farm which I am trying to make as energy efficient as possible. A big chunk of my power consumption comes from LED lights which are powered by solar panels/batteries, ...
AndreAwb's user avatar
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1 answer
30 views

Detecting laser spot positon

I have a pulsed laser (532 nm, 250 ps) operating with a period of 20 μs. I need to detect the location of the pulses in a 100 × 100 mm area with 5 mm resolution. Being a complete novice to the field ...
Thomas Holle's user avatar
1 vote
1 answer
348 views

Lens arrangement for laser tag?

I’m working on a laser tag game using IR LEDs and demodulation ICs. The trick is to force the gun to be aimed accurately at the center of the target. I’m willing to experiment, but I don’t really know ...
Rick's user avatar
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Red Laser Safety Filters?

First of all, apologies if this is the wrong SE site. Last year I bought a k40 laser cutter and it came with a square orange/red acrylic safety filter, which is meant to be used for looking through ...
Konchog's user avatar
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How to filter out light entering bayes filter

I am trying to run an experiment where I have green fluorescent beads that absorb 490nm light and when excited, emit light at 515nm. Right next to it, I have brilliant blue light that absorbs ~620nm ...
Mantej Singh's user avatar
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1 answer
77 views

Diffusing a Laser beam

I am working with a variable power laser system that has a wavelength of 0.8μm – 1.1 μm. The laser set up in the lab must be able to weld any gauge of material together for the experiment to take ...
David Wisniewski's user avatar
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2 answers
100 views

How to solve transient heat conduction equation at a point in space with volumetric heat source?

My system is a fluid exposed to light and I want to calculate the temperature change with time at a point, hence there are no spatial effects or convection due to the flow of the fluid. The heat ...
Catridge40 keen's user avatar
1 vote
1 answer
57 views

What are the effects of temperature on optical fiber waveform

I am attempting to measure temperature using a signal through an optical fiber. If I send a waveform through an optical fiber, how would temperature affect it? I've looked here (Calculating ...
jcu's user avatar
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0 answers
57 views

Optical diffuser design

I have a small 3D printed SLA box, about 3.5" x 2.5" x 2". Here is the bottom half: And the top half with an LED inside, facing down, placed off-center, about 1.75" above the &...
Paul Jurczak's user avatar
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34 views

Bandwidth distance product formula

I read the following in one reference: A copper wire (twisted pair), the link traditionally associated with low bit rate transmission, is still in use in the modern data centers transmitting data at ...
Noha's user avatar
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10 votes
2 answers
3k views

Can a very bright light attract an incoming laser guided weapon?

I would like to know if a very bright light will attract an incoming laser guided weapon such as a laser guided missile. Say for example that a tank has a six-foot pole on the top of it and attached ...
user57467's user avatar
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0 votes
1 answer
120 views

Prototyping optics for laser rangefinder

I am a software engineer dabbling in optoelectronic systems. I can bumble my way through but I don't really know what I'm doing, and right now I'm figuring out how to prototype optical components. The ...
cmc's user avatar
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1 vote
1 answer
147 views

What is the branch of engineering that deals with corrective eyeglasses?

So I was curious about what principle used to manufacture corrective eyeglasses. Of course it uses physics, especially optics. But what engineer branch or degree is needed to manufacture it? I ...
Hafiz's user avatar
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1 answer
149 views

Plus and minus power of Cylinder

This is my glasses prescription, is the cylinder minus applied at the meridians 180 and 10? So the the light is diverged at 180 and 10? Or does the axis value refer to the horizontal axis of a ...
ThreadBucks's user avatar
-1 votes
2 answers
67 views

Angle of incidence in concave mirrors [closed]

What happens when you change the angle of incidence(normal to the mirror)? How does the angle of reflection change? Is it invariant?
ThreadBucks's user avatar
1 vote
2 answers
434 views

Dioptres of lens in glasses

If your glasses lenses have a +2.00D SPH and -1.75CYL. Does this mean the lens is composed of both cylindrical lenses and spherical lenses? For the Spherical lenses, if the diopetres is 2. The focal ...
ThreadBucks's user avatar
4 votes
2 answers
2k views

Why does light bend after travelling half of the lens?

As light enters a denser medium from a rarer medium, it bends towards the normal. Why does the light bend after passing through point F & not E?
S.M.T's user avatar
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1 vote
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How is light guided by a perfect mirror waveguide for angles not exactly at the guided mode angles?

Take the below image for example: Let's imagine the cladding is really just perfect mirrors, where all light energy is reflected back towards the core. I understand that modes arise by imposing the ...
banjoeschmoe's user avatar
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Please help to understand relation between simplified and real optical system for triangulation process

I'm far away from being an optical engineer, so I require some assistance. I have an optical system consisting of industrial camera and lens (manual iris + manual focus). 1)Lens documentation states ...
Daniil's user avatar
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Determining an adequate lens for collimation

I'm looking to develop an optical system to collimate a LED that is going to be fitted to glasses. I have a 5 mm diameter de-domed LED with a circular aperture that I need to produce a clean and even ...
MechFlag's user avatar
1 vote
1 answer
36 views

Why does my wall reflect green color when I shine blue light on it?

On the wall , i Walter had put a poster & when I removed the poster. I shone blue + red + white light on my white wall in the dark room. Under blue light only , I am able to see so many details. ...
S.M.T's user avatar
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117 views

How can a screen be projected on a transparent glass?

I am building something similar to Google Glasses although not exactly that. I am trying to find a way to project my 0.96inch OLED on a glass, but it can't block the front view. What I tried to do is ...
Abrar's user avatar
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