Laser Precision How to aim a laser beam on a photoresistor 40m away?
I need to direct a laser beam from a cheap laser pointer to a photoresistor 40m away. The area of the resistor is less than 1 sq. cm., so the pointer needs to be aligned precisely. I tried fixing the pointer on a camera tripod but I need more precision. Any ideas on how to do this?
The problem is aiming correctly.
I once had a telescope that had an alignment ring for the viewfinder. This was a ring with 3 screws around it and the viewfinder in the middle. You could use a screwdriver to turn each of the screws and thus aim easily by moving the viewfinder in very fine steps.
I was thinking that maybe something like that existed for this particular application, that I could find easily.
Although a theodolite would be perfect, it's way out of my project's budget...any other ideas?
One could make a fairly precise aiming device from two strap hinges, 2 springs (moderately stiff) , 2 machine screws (preferably fairly fine thread) and 2 wing or knurled nuts. Placing the spring between the two leaves of the spring with the screw holding it together give one a fine angle adjustment, connecting two at right angles can give one altitude and azimuth adjustment. Attach your pointer to the assembly, and the assembly to a sturdy support (perhaps you tripod with some ballast, maybe a jug of water or a sandbag)
EDIT;
As an example, supposing one got hinges that were 10cm between the hinge pin and the hole the bolt goes through, further the bolt has a thread pitch of 0.5mm , in this case, about a 20° turn of the adjusting nut will make a one minute of arc change in the angle of the hinge, I would guess that with a moderately stiff spring to remove slack from the mechanism, a light touch on the screw and a very sturdy support, a couple arc seconds adjustment might be possible
One might also _try_ a lens to diverge the beam a bit, while this will reduce the light falling on the photo resistor, it might still be enough and could make aiming easier.
Miniaturization and high precision are rapidly becoming a requirement for many industrial processes and products. As a result, there is greater interest in the use of laser microfabrication technology to achieve these goals. This book composed of 16 chapters covers all the topics of laser precision processing from fundamental aspects to industrial applications to both inorganic and biological materials. It reviews the sate of the art of research and technological development in the area of laser processing.
The laser cut precision initial necklace isgreat for anyone who loves a chic personalized piece. The laser cutinitial pendant features beautiful leaf themed designs and the chaineven features a small leaf charm near the clasp. This c
Fast and very simple way to mount both a bright target illuminating light plus a fast aiming red laser to almost any scope with a 1" diameter body tube. Now you can illuminate your target under low light or zero light conditions while simultaneously directing a laser beam that will denote point of pellet strike. Easily mounts onto any 1" rifle scope with up to a 50mm diameter objective lens. Works for all small caliber rifles and all air rifles up to 1000 fps. Kit includes mounting bracket; instruction manual; hex wrench set, 3V. battery for flashlight & (3) 1.5V LR44 batteries for laser sight; remote pressure- sensitive switch and manual push button switch for both laser and flash light. Aluminum mounting bracket, laser and light bodies, black anodized finish.
LS1 Laser Mouse is a sleek, glossy finish with color accents adds style to any workspace, and the high-precision. LS1 Laser Mouse with laser sensor and rubber grip deliver exceptional performance and comfort.
These Laser Cut horoscope necklaces feature a precise design. The pendant on these necklaces feature each astrological sign, which has been laser cut into the coins. This precision allows for each sign to have a unique design.
Laser Genetics Handheld Laser LocatorThe ND5 Long Distance Laser Illuminator is the first high powered, hand held laser light built for civilian use. The patented design integrates a state of the art micro Green Laser Pump with a hand controlled Linear Optical Collimator to create the ultimate lighting instrument. One hand, thumb control quickly adjusts laser beam diameter and illumination intensity. Features: PRECISION MACHINED FROM HIGH TECH ALUMINUM BLACK MATTE ANODIZED FINISH FULLY MULTI COATED OPTICAL LENS SYSTEM. FULLY O RING SEALED FOR DUST AND WATER NITROGEN CHARGED FOR ANTI-FOG POWER SUPPLY: 2 CR123A BATTERIES (INCLUDED) BATTERY LIFE: UP TO 8 HOURS CONTINUOUS USE ROTARY OPTICAL BEAM COLLIMATOR- ALLOWS QUICK ADJUSTMENT OF BEAM DIAMETER AND INTENSITY. Specifications WEIGHT: 1.2 lb. DIMENSIONS: 9.75�L X 2.25� DIA. X 1.2� DIA. TUBE RANGE: UP TO 5.0 MILES OUTPUT POWER: 20mW 532nm LASER LIGHT FREQUENCY- EASIEST LIGHT FOR THE HUMAN EYE TO SEE. Contents: Laser Genetics Handheld Laser Locator. Type: Laser Rangefinders
High Quality Content by WIKIPEDIA articles A laser designator is a laser light source which is used to designate a target. Laser designators provide targeting for laser guided bombs, missiles, or precision artillery munitions, such as the Paveway series of bombs, LockheedMartins Hellfire, or the Copperhead round, respectively. When a target is marked by a designator, the beam is invisible and does not shine continuously. Instead, a series of coded pulses of laserlight are fired. These signals bounce off the target into the sky, where they are detected by the seeker on the laser guided munition, which steers itself towards the centre of the reflected signal. Unless the people being targeted possess laser detection equipment or can hear aircraft overhead, it is extremely difficult for them to tell whether they are being marked or not. Laser designators work best in clear atmospheric conditions. Cloud cover, rain or smoke can make reliable designation of targets difficult or even impossible. Author: Miller, Frederic P./ Vandome, Agnes F./ McBrewster, John Binding Type: Paperback Number of Pages: 88 Publication Date: 2010/06/29 Language: English Dimensions: 5.98 x 9.01 x 0.21 inches
These replaceable point inserts are precision made with 8/32 threads. Each press fit insert has shaft size laser printed for proper identification.
Account limit of 2104 requests per hour exceeded.
World Champion Ivan Denisov jerks two 24kg Kettlebells
How Laser Eye Surgery Works – Lasik and Photorefractive Eye Surgery
People with eye-related problems are becoming more and more interested in laser eye surgery and its benefits because this is known to be the most exciting ophthalmologic procedure.
To be more precise, this is a refractive eye surgery that can correct all types of refractive errors such as: astigmatism (distorted vision), myopia (nearsightedness) and hyperopia (farsightedness).
Even if the medicine offers various types of surgical techniques for correcting refractive errors, the laser eye surgery was labelled by the American Academy of Ophthalmology the most technically advanced and precise one.
The excimer laser was the first laser ever approved for eye surgery and it’s used to correct myopia. Now, this laser is used in two different procedures: Laser in situ Keratomileusis (LASIK) and Photorefractive Keratectomy (PRK).
Photorefractive Keratectomy (PRK)
The surgeon maps and measures the patient’s eye before the procedure in order to analyse the problem. Then, he uses a few local anesthetic eye drops and reshapes the cornea eliminating tiny amounts of tissue from the outer surface.
Next, the doctor uses an ultra violet beam of light and cuts notches the size of human hair. Each pulse of light can remove a 39 millionth of an inch of cornel tissue in only 12 billionths of a second.
According to same studies, only 5% of the patients still use permanent glasses after the surgery while 15% need visual aids only when driving.
Laser in situ Keratomileusis (LASIK)
The LASIK procedure is more complicated than PRK but it’s a solution for solving all types of myopia.
The surgeon uses the Microkeratome to cut a corneal tissue flap in order to replace it. Everything depends on the doctor because with LASIK he has to make a very precise incision.
The patient only feels a little discomfort and sometimes an irritation but those won’t last too long. In most cases, the patients returned to their normal life in only two or three days.
With LASIK there can be only one side effect and that is occasional glare at night.
Anyway, everyone should know that even if the results are said to be permanent, the age can influence the final results and in some cases the doctor may even suggested re-surgery.
Sorry, comments for this entry are closed at this time.