fibre optics

Hello, Hope to find here some information about Optical Fibres. I am building an under water housing for DSLR. I want to use it just under the water surface. Controlling (through an air bridge) and exposure (through optical light guide) are on land. The question is about optical fibres. I need a 160 cm long Fibre Optic Lightguide. A 1/4 inch diameter guide costs near 200 GBP. When I would make one myself of 1/2 inch diameter, I could safe 75 % + the entrance surface is more than 3 times larger, which is important, since I will have to guide the light of a flash gun! BUT, I doubt wether such a diy bundle of 1,5 mm diameter plastic fibres from ebay will give me roughly the same or preferably more light output as/than a professional guide? How do these plastic ebay fibres compare to professional or glass fibres in terms of light transfer efficiency? Any suggestions? If not, then a reference to another forum where they might be able to answer my questions, would be much appreciated.

Topic by butterflies55555   |  last reply


Optical illusions are fun

How many animals do you see?

Topic by Downunder35m   |  last reply


Optical Mouse Help!

I need someone to explain a typical optical mouse circuit to me using diagrams and such. I could do it myself but I only have one optical mouse on me at the moment so Id have to go to the store to get a really cheap one. I'm on the verge of a kipkay quality instructable!

Topic by emuman4evr   |  last reply


Fibre optic tree?

I want to run my Christmas fibre optic tree without the motor.  Would I have to alter anything, its lamp is 15w 12v?

Question by eileenlilley   |  last reply


Jesus optical illusion

Does anybody know why this works, its so cool! Stare at the 4 dots in the middle for 30-40 seconds, then look at something like a white wall. Then blink, what do you see?

Topic by guyfrom7up   |  last reply


optical pulse oximeter

Hello everybody, I have a big problem. I want to do for the optical pulse oximeter project was a link posted here.  I need the code and the circuit diagram in there to do the project. this is an emergency. can you help me please? Can you at least provide me access to people who share the project's e-mail address? thank you and I am waiting for your help. my e-mail adress: merveebudakk@gmail.com

Topic by mervebdk   |  last reply


Refinishing Optical Media

I was thinking about ways to actually get good data off of a fucked disk. I figured for a permanent solution, instead of grinding the disk down, or filling it in with greasy things, actually reforming the surface of the disk with some clear resin or acrylic. Comments?

Topic by Crash2108   |  last reply


a DIY optical port

I have been intrested in optical computer for a while but found them rather expensive to build so I tried to look for cheaper ways to build some key features like the gates. The basic idea is to use solar cells that power a led. For and OR-Port you use solarcells where it is enough that one of the side gets light to make the led burn. To make and AND-port, you can put a resitor in between so that it really needs the power form both channel sot make a led burn. For a NOT-port you put an invertor in, so that when it burns it gives no signal, and wheren it does not receive light it burns this because of a battery it caries. A NOT-port is almost like a led-throwie.I do hav emore but wanted to know if this would be a good place or not, or if someones intrested in hearing on how to build a full optical computer, still basic, but almost completly optical, or if it would be better to post this on the microprocessor group at the opencourseware of the MIT ?

Topic by Floris Vermeir   |  last reply


Plastic Optic Fiber

Hi, I made a lot of research in order to find some plastic optic fiber in europe, and I finaly add to buy some full rolls of the one I liked. It it PMMA fiber with 0.3dB/m light loss, it polish well, and when use with long length, gives a sligher yellow / green color to the light (noticeable on white light, but really lower than the other I've tryed). If someone need some, I can make a kit with : -27 meters of 0.75mm diameter -15 meters of 1.00mm diameter - 7 meters of 1.50mm diameter I think thati ncluding shipping to anywhere I can send it for tens euros. If someone is interested, let me know and I will check shipping price and paypal fees. Regards, tReg.

Topic by treg   |  last reply


Freaky Optical Illusion!

Here is a cool optical illusion I got in an email:'The Brain'This is quite amazing..If you see this lady turning in clockwise you are using your right brain. If you see it the other way, you are using left brain.Some people do see both ways, but most people see it only one way.See if you can make her go one way and then the other byshifting the brain's current.BOTH DIRECTIONS CAN BE SEENExperimentation has shown that the two different sides, or hemispheres,of the brain are responsible for different manners of thinking.The following table illustrates the differences between left-brain andright-brain thinking:Left Brain Right BrainLogical RandomSequential IntuitiveRational HolisticAnalytical SynthesizingObjective SubjectiveLooks at Looks atparts wholesMost individuals have a distinct preference for one of these styles of thinking. Some, however, are morewhole-brained and equally adept at both modes.In general, schools tend to favor left-brain modes ofthinking, while downplaying the right-brain activities.Left-brain scholastic subjects focus on logical thinking,analysis, and accuracy. Right-brained subjects, on theother hand, focus on aesthetics, feeling, and creativity.If you look away, she may switch from one direction to the other.I found that if I just look at her feet or relax and look at the floorwhere the reflection shows, she will switch direction!

Topic by Arbitror   |  last reply


Optical Image Stabilization

Hi everyone, I have a little awkward question here but I am sure someone who knows a little bit more about electronics can give me good advice. I took apart the lens from a consumer video camera and took out the Optical Image Stabilization module in an effort to figure out how it works and possibly hijack the signal so I can control the movement. In the camera this module is getting the signal from the accelerometer so it knows how to engage the two electromagnets and counteract the movement (shaking). What I have done is take the leads that go into it and try to fake what gyro sends to this element. So far I have noticed that when I short 1 and 2 or 3 and 4 the element goes to one side or up. So I put a potentiometer on it (2K ohm) and it gives me some control by turning the dial, but not good enough. Has anyone any idea how can I achieve a gradual movement of this lens element vertically and sideways with a slider or dial of some sort? Your help would be greatly appreciated!

Topic by Sudija 


usb over fiber optic cable

My house was once part of a business that was connected to neighboring structures via fiber optics for Internet.  I want to put in a security system with some usb cameras and of course we know what those limits are.  I have successfully made 25' usb/cat5 cables using this site... they work great but I need 50 - 60'.  I was wondering if it was possible to utilize these fiber cables for the data side of the usb and somehow power it by other sources?  I know a little about fiber like putting in connectors and such and I do have 2 transceivers.  I can make rj45/usb connectors for the tranceiver ends but I'm just not sure of the details or even if I'm barking up the right tree.  I'm not sure where the power fits in either. Any of you geniuses know how I could do this? Thanks

Topic by cornflake000   |  last reply


Mechanical and optics help needed for camera tinker project Answered

Hi, Some time ago I acquired a beautiful old bellows plate camera, quite closely resembling the top one on this page. Mostly I try to use old cameras with the film they're designed for, but plate photography is going a bit to far for my tastes. Therefore I set out to convert the camera to a digital one. Something like the SVP FS1700 seems perfect for turning into an improvised digital back, but I think I'll need something to look through and focus as well. I've made a quick sketch of what I think would be a good construction, it can be seen at http://www.incarnations.nl/temp/camera.jpg. (1) and (2) are mirrors, projecting the image on the ground glass plate in the camera to the viewfinder on top. When the camera has been aimed and focussed, mirror (1) can be flipped down, allowing the scanner (3) to take the picture. I'm a kinda decent tinkerer, but I've got no experience with lenses, mirrors and the like. A couple of questions I'd like to have answered: 1) Does this have any chance of actually working? 2) What would be the best way to determine the proper placing and angle of the mirrors? 3) The distance between the scanner and the glass plate might cause some focus problems. Could this be worked around with lenses or an extra ground glass plate, or will this cause more trouble than it's worth? 4) As an added bonus I'd like to add split-images focus to the viewfinder, but I have no clue how this works. It can't be as easy as just buying the prism/glass and inserting it into the viewfinder, right? Any help or advice anyone can give me would be greatly appreciated!

Question by Fransvb   |  last reply


Does anyone know what causes this effect in a copper pipe? Answered

When you view light through a copper pipe you see all these neat rings I wondered if anybody knew why. Thanks

Question by nurdee1   |  last reply


How do I make 2 or more objects light up when they come near each other, or get brighter, or change color? any ideas?

How do I make one or 2 objects(I have in mind small objects) light up when they come close to each other? or brighten or change color? Some one suggested proximity sensors. But then they would react when anything came close. He then suggested using magnets in some way so they would react to each other. I have a lamp that turns on when you wave your hand over it. If you place your hand close to the top of the container then slowly raise it the light will brighten, then dim as you lower your hand. Not sure if that is related to my quest, though I am interested in that also. Any ideas?

Question by hardenbrook   |  last reply


Parallel beam of light out of biconvex lens f=45mm

Hi, I would like to create an almost parallel beam of light with an LED and a biconvex lens. Therefore I have to place the LED directly in the focal point. I thought of a setup with a PVC pipe with threading: I could glue the lens to one end and screw a cap onto the other. Then I would drill a hole in the middle of the cap and stick the LED through the hole. By screwing the cap back and forth on the PVC pipe I would be able to find the exact focal point and then fix the cap in place. There is just one problem: Lenses are either incredibly expensive or only available as sets. The only exception I found so far are lenses for google cardboard. They sell for just a few euros on ebay. Google cardboard lenses have a focal length of 45mm and different diameters, I would like to use a diameter of 25mm which is no problem. Now I wonder: Is the focal length of 45mm too small ? Will I be able to get an (almost) parallel beam of light out of this setup ? The LED is no ideal point light source. Originally I wanted to get f>80mm but that is really expensive. Anyone with experience on this kind of setup ? Tips you could share ? Can I get this to work, or will the approach be too unprecise.

Topic by mintwurm   |  last reply


Fiber Optic Illuminated Heels

I found these gorgeous Fiber Optic Illuminated Heels on Fashioning Technology.  These heels from Anastasia Radevich's Kinect 2011 collection.  They are illuminated using fiber optic technology and turn on with switches placed at the ankels.

Topic by Carleyy   |  last reply


Extend optical mouse range

Hi all, I'm wanting to make a jig for a production project requiring a sensitive optical measure of movement with a focal length of 5-10 mm. I thought an optical mouse might be a good start but the lenses in a few I've tried require the device to be too close. It needs to be no bigger than the electronics of a mouse. If anyone has a lens that could be perfect or other ideas I'd love to hear them. Thanks, D

Topic by Qball007   |  last reply


How to use Fiber Optics?

I am making a super-discreet earpiece/IEM that is intended for any use where you feel bored, where you are not supposed to use electronic devices. Meetings, lectures, classrooms, etc. Basically, it's a 3.5mm jack wired to a Balanced Armature driver. Essentially, I remove the big, thick and bulky housings of earpieces and leaving the smaller drivers in place. I've been using thin copper cables in the earpieces I buy. They work, but are still visible. I found that optical cables are near invisible, glass-like. I intend to wire them into my earpieces. So, do I require lots of circuits? I can do those, if they don't poke a black hole in my wallet. No more than USD100, if entirely possible.  I just want to know how to change electricity into light and back again, and allow for audio transfer from MP3 player to earpiece drivers.

Topic by chua_erei   |  last reply


LDR or optical reflective sensor?

I am planing to make a line following robot without micro controllers. So I am using a light sensor connected to an AND GATE (the other input being the current to the motor). So since I am using" an and "gate I want the input current to be an absolute zero or some value ,ie the current should not be varrying with the light intensity. Besides I think I might drop the "and gate" thing and use an OPAMP instead as it would give me a varrying output current which is all I need

Question by chrissunny94   |  last reply


​Make an optic close focus.

I want to be able to put my night vision monocular in front of my 2x scope on my airsoft.I need a combination of lenses to put between my scope and the NV to let the scope focus at a couple of inches (instead of 30 feet), and reduce magnification because otherwise I’d just be looking at a tiny part of the phosphor screen heavily magnified.I know it’s possible because a commercial unit is available, I just don’t know if it’s feasible for a guy like me (doesn't have a degree in optics) to build (I'm thinking no, but I figured I'd ask).Thanks for any help you can offer.

Topic by instrucables360   |  last reply


Optics question; physics homework... Answered

Hi guys, There is a new physics teacher at school and he asked us this question: an object fell into a very dark hole in the ground and you don't have a flashlight, but the sun is 30 degrees above the horizon. Using a mirror you have to reflect light from the sun into the hole. In one case the hole is one meter deep and in the second case it's three meters deep. The question is: what angle should the mirror be placed in relation to the sun (or horizon) to illuminate the hole? I don't really remember how to calculate this so if you can help me that would be great. Thanks!

Question by Eunix   |  last reply


Efficacy of cheap laser pointer optics

Are cheap laser pointer optical units suitable for adapting with high powerlaser diodes from DVD-RW drives. I don't have access to internet transactionsso I can't get a laser module.

Topic by volthead 


How do I arrange optics to make a decent periscope? Answered

Ever since I watched the first season of Stargate SG1, I've wanted one of those sweet little tactical periscopes that Jack o'Neill uses to look around corners to avoid Jaffa. The image is here, but it's just a prop! As far as I can tell, they either don't exist or are absurdly expensive or are just really hard to find. So I want to make one. I know some basic optics from working in a university laser lab, but we don't usually use lenses and such. I have played with simple two-lens telescopes and know that the ratio of the focal lengths is the amount by which an image is magnified. The corner would need to have a tiny prism in it. The problem I'm having is this: If I use tiny lenses, and a longish (~30cm) tube, the viewable area is ridiculously small. I would love to find a way to enlarge the viewable area I see in the eyepiece. Does anyone here know how this is done? At the very least I would like to know how to position the optics so that it seems like my eye is at the far end of the periscope. Maybe I could use a peephole lens to get a wider field of view too.

Question by laserjocky   |  last reply


what do i do with 420 meters of adss optical fiber cable

I have recently purchased 420 meters of ADSS fiber cable from a local utility company. Why you ask? Cause it was cheap. It was manufactured in 2008 by Alcoa Fujikura.  Here are the specs that I have .701" diameter 144ct fiber Single mode 8 buffer tubes 18 fibers per tube Does anyone have any suggestions for what I should do with it? Or just any ideas on who's hands it should end up in?  Any help would be greatly appreciated 

Topic by idontknownothin 


can you really make night vision headgear with just Congo blue and primary gel sheets and a handful of IR leds ?

I have seen this on the net quite a few times but I have my doubts, would it be as good as using camcorder viewfinders and IR leds

Question by Barramundi   |  last reply


Telescope repair advice wanted: UPDATED!

This question is more like 2 questions- 1) Am I crazy? 2) Is this feasible? Background: I recently inherited an astronomical reflecting telescope, which I think has been dropped at some point.  The design is as below. Where the eyepiece enters the side of the tube that makes up the body of the scope, the tube is slightly dented.  The eyepiece still points at the secondary mirror and the alignment is good enough that I can point the scope at an object and get an image, but the alignment isn't perfect so the image has a lot of what I'd guess is spherical aberration preventing a decent image. Firstly- is having the eyepiece on-axis and perfectly aligned so important that I will never ever get even a half-decent image from this scope?  If the tolerance involved are 0.1mm and minutes or seconds of angle, I doubt I can restore it that well. Secondly, is having the eyepiece positioned on-axis as important as having it parallel with the ideal axial light path?  As it's held in with three screws I'd imagine I can tweak the alignment with some use of spacers etc. but if it's off-axis I don't think I can shift it back to the perfect position.  In other words, for the mathematicians, is having the eyepiece "translated" as much of a problem as having it "rotated"? (Thirdly- if the reflecting scope is trash, can I get a 150mm diameter 1000mm focus lens and make a straight-through scope with the bits?) UPDATE: it's working perfectly, see pictures below!

Topic by PKM   |  last reply


How does the optics on the "Prayer Cross" work and how might I replicate that? Answered

I was interested in creating jewelry and thought that I could use this as a hard to find place for sensitive information.

Question by Xenel   |  last reply


Where is a rainbow? Answered

As you may be aware, your reflection in a mirror appears to be behind the mirror. But, where is a rainbow? The Sun is over your shoulder, the cloud of raindrops is in front of you, but what is the apparent location of the rainbow? Is it between the observer and the water droplets, in the same location as the water droplets, or behind the water droplets (from the POV of the observer)? Or is it at some indefinably infinite location? I should know this... (a sketched-out ray diagram would be greatly appreciated)

Question by Kiteman   |  last reply


What to make from ridiculous Zoomies glasses

So I just got some of these ridiculous glasses from my grandpa. They are advertised as hands-free binoculars, and claim to solve all those issues you had with normal binoculars (?) Anyway, they are terrible, their lens quality is crap, their focus sensitivity is terrible, they are uncomfortable, and make you look like a complete fool. Anyway, ideas about what to make with these things? Might as well make something useful with them.  I was thinking a pair of opera glasses, there are three sets of lenses in the goggles. The plastic frame and focus assembly are pretty weak and can't support much, but could be steampunked or something.  Any ideas appreciated.

Topic by ilpug   |  last reply


Take a look at this! 2 parabolic troughs combined to make a point focus!

Http://www.youtube.com/watch?v=FYzgYI9_h6s is from a Swedish mathematician.He bounces light from one trough to the other to produce the point of light. Even if it is not as efficient as a parabolic dish (2 reflections instead of 1) it must be easier!He is just curving sheet material. I have made parabolic dishes and it is really hard to be exact enough and it is really hard to get the reflective material to go onto the dish without crinkling. So under "real life" amateur conditions, his apparatus is likely to be as efficient as a home made parabolic dish!He has more info http://www.youtube.com/user/MathRehab and he has pdf files to download too.Great Idea. Hope someone makes an instructable.Brian White

Topic by gaiatechnician   |  last reply


New group started - Optic fiber

I'm read a lot of document about optic fiber, and I've seen that: -many people are interested in optic fiber (it's magic, just like leds are) -people make some good craft with optic fiber, but sometime don't have the needed understanding of how it works, how to cut it, sand it, bend it, ...) -reader of the nice instructables here have trouble buying optic fiber when they want to start new project. I hope this group will help people learning from eachother, leading to new more interesting project and instructables. tReg.

Topic by treg 


10 Optical Illusions in 2 Minutes

The new advertising is a little longer, but a little more entertaining as this short video is a good example of. I don't care much about getting a new phone, but kudos to Samsung for making a playful video that compiles some classic optical illusions.via Techeblog

Topic by fungus amungus   |  last reply


Optical fibre cable DAC chip??

Hey everyone,I'm trying to take an audio signal from an optical fibre cable pass it through a DAC0800LCN IC, 8BIT DAC chip and input into the Arduino. I'm trying to use a 3 pin fiber optica toslink transmitter to connect the fibre optical cable to the DAC chip. Does anyone know how to set this up or even if this would work? If anyone could answer this is would be much appreciated.

Question by MCsugar43 


fiber optic transmitter and reciever booster

I am a hobbist/inventor/sculptor/geek. I am looking for plans or a kit to build a fiber optic booster transmitter and reciever. Or even a unit that can send and recieve data and video signals. The signal must be able to travel a minimum of 300 ft. I am trying to build a submersible rov that I can afford. The other option that I might have is a rf to fiber optic converter. Would anyone be able to help me out?

Topic by batguanno 


optical sensors from projection TV

I have a *lot* of junk from old TVs -  projection lenses, a fresnel lens and pcbs. so far I've only used caps and resistors in small projects. recently I came across a set of 4 optical sensors anchored to the inside of a projection TV, I believe they are used for auto alignment of the RGB images on the mirror. What is a good project to use these in? could I use them to possibly build some sort of solar tracker ? perhaps using an arduino ? any ideas appreciated.

Topic by dhymers 


Spring-loaded optical drive door?

Hello, I just build a new desktop PC and would love to have a spring-loaded door, with an eject button, to cover my CD/DVD drive, like the ones on HP or Acer computers I can't seem to find any sold commercially. Does anybody know how to build one?

Question by CanCB   |  last reply


Fiber optic cable to laser projector? Answered

I purchased a "Mr. Christmas" Laser (green) Outdoor Holiday Projector to add to my holiday lighting this year. Being rightly concerned with theft if I was naive enough to leave the projector outside, I thought of using fiber optic cable attached to the laser lens housing (still haven't worked out how I would accomplish that), and routing it from inside the house to a point outiside where the cable end would project on a wall or my garage door, providing a show (sans sound), but protecting the laser projector from theft. Is my idea feasible? If not, I'm open to suggestions. Thanks. 

Question by Oldie Juan Kenobi   |  last reply


Motor and base design for optical toys

Hello everybody! I'm in the process of building a reiteration of a series of optical toys (like this one, or these) with motor, stroboscopes and little music system. The thing is their discs measure about 1 m (like 3,2 feets) and one of them (praxinoscope) is a heavy one due to the mirrors it possess (see photo [it isn't it's actual state]) so I created a metal base for it with a tube, three metal angles as legs and washing machine 115v ~60hz 70W 250VAC single phase motor soldered on (with capacitor), so the disc sits on top of the motor, and the thing is that after an hour of so of being tested on continuous duty it stopped and started to smell like burnt. What could the problem be? Could it be a design problem since the motor has all that weight on top? Should I have used gears and pulleys? How can I make it last longer without it being to complex?  If someone can help or has some ideas I'd appreciate it , thanks in advance! Benkos M. G.

Topic by BenkosM   |  last reply


Optical reading of paper cards/tape? Answered

Hi everyone,  I wanted to know what would be involved in reading the position of dark marks on paper cards or tape, a la IBM. Something that can read the information from the card with things like pencil/ink marks instead of holes punched through it.  What would I need? Could I get away with basic LEDs, or would I need something more complex like a CCD from a scanner?  Many thanks!

Question by DrRorschach   |  last reply


How to bend plastic optic fiber ?

Hi, I have 0.75, 1 and 1.5mm plastic opic fiber that I am using for my project (which will be the topic of my first instructables ;) ) I need a way to bend the POF in right angle. I don't care if the bending raidus is not very important (spec says max radius is 10 time diameter, 15mm radius is ok for me, and I don't care if I loose a little brightness). I want the POF to stay bend after I have bent it : it must keep the curve I gave it for at least 24 hours. I manage doing something not so bade (but really time consuming) by heating the POF with an hair dryer. I wander if anybody has a better tested idea ? (in the meantime, I'll try putin it in boiling water to see if it kep the shape once cooled). Regards, tReg.

Topic by treg   |  last reply


How to make fiber optic filament from fishing line? Answered

I am thinking of making my own fiber optic lamp / toy and was wondering if it was possible to make my own optical fibers from fishing line.

Question by devicemodder   |  last reply



In kipkays optical theremin, would you make the pitch lower?

Http://rsinventionlab.com/optical-thereminI'm trying to play the sound through a 12 inch sub, and i need a lower pitch

Question by rickyd! 


fiber optic star field without attic?

Is there a way to make a fiber optic star ceiling without an attic??

Question by tim13211   |  last reply


mouse reassembling

How to reassemble a broken optical mouse?

Topic by krishna_ei   |  last reply


can i use an optical mouse (through an arduino) as a pulse oxymeter?

Arduino can read coordinates from a mouse, a small example is in the following link http://www.martijnthe.nl/2009/07/interfacing-an-optical-mouse-sensor-to-your-arduino/ But how could read color for using mouse as an pulse oxymeter? More than this we could use it with optical fiber adapted to the "eye" of the mouse for intravascular measuring ScvO2 !!!???

Question by clblue   |  last reply


how to convert usb optical mouse to wireless

How to convert my wired optical mouse to wireless? please help me...

Topic by christin_meghan   |  last reply


How to make a laser pointer out of a dvd laser diode? Answered

I have about 8 laser diodes and many optical stuff from the laser head of the dvd. Also I have some burnt laser poineters. I don't know how to focus the ray.

Question by theVader75   |  last reply


where to get fiber optic scraps for art project

Where can I get fiber optic scraps, 1-2mm glass for an art/tech project? 2-5 ft long about a laundry basket  to small truck bed full.        Houston TX

Topic by broodinghen   |  last reply