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Topic: Collimated light

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  Collimated light - Wikipedia, the free encyclopedia
Collimated light is light whose rays are parallel and thus has a plane wavefront.
Light can be collimated by a number of processes, the easiest being to shine it on a parabolic concave mirror with the source at the focus.
Collimated light is sometimes said to be focused at infinity.
en.wikipedia.org /wiki/Collimated_light   (272 words)

 Synchrotron light - Wikipedia, the free encyclopedia
Synchrotron light is electromagnetic radiation produced by bending magnets and insertion devices (undulators or wigglers) in storage rings and free electron lasers.
A large fraction of experiments using synchrotron light use it to probe the structure of matter from the sub-nanometer level of electronic structure to the micrometer and millimeter level important in medical imaging.
At the end of the beamline is the experimental end station, where samples are placed in the line of the radiation, and detectors are positioned to measure the resulting diffraction, scattering or secondary radiation.
en.wikipedia.org /wiki/Synchrotron_light   (531 words)

 Glue drop detector - United States Patent 4,215,939
Collimated light is projected onto the reflective inner surface of the closure, and a measurement is taken of the amount of light which remains collimated after reflection from the closure.
1, light from a light source 8, located at the focal point of a converging lens 10, is passed through the lens 10 (which causes the light emanating from the lens 10 to be collimated), through a beam splitter 12 and projected onto the reflective flat inside surface 13 of a closure 14.
The light is reflected from the closure 14 back to the beam splitter 12, from which it is reflected to a second converging lens 18, having an optic axis 19 and a focal point 21.
xrint.com /patents/us/4215939   (2210 words)

 U.S. Patent: 5517312 - Device for measuring the thickness of thin films - May 14, 1996
The transmitter 12 produces a collimated light beam 22 which is deflected by the beam splitter 14 and focused on the sample 10 by the objective lens 16.
During imaging operations, the incoherent light source 134 is operative and it, together with the focusing lens 150, the and the condenser 16 form an incoherent illuminator whose light beam forms an incoherent light spot on the surface of sample 57.
Since light beams 209 and 211 are parallel to each other and to the surface of sample 208, the movement of the beam deflector 202 in the X direction does not affect the measurements of the detector unit 206.
www.everypatent.com /comp/pat5517312.html   (5938 words)

 Thermo-optic light modulation array - Patent 4635082
The array comprises a light transmitting medium arranged in contact with an array of pixel shaped heaters which are selectively energized in response to digitized data signals for pulse heating the portions of the medium in vicinity of the heaters.
Light is scattered because of turbulence in the layer created by the application of a voltage across the layer in the regions between the electrodes having the voltage applied thereto.
Light traveling over the heater surfaces or through the transparent heaters is redirected or deflected because of the index of refraction gradient developed in the transparent medium contacting each heated heater element during each heating pulse.
www.freepatentsonline.com /4635082.html   (6822 words)

 Portable golf club swing speed indicator with downward angled collimated light sensors - Patent 5634855
The light sensors which detect the transition of golf clubhead in the area of the rubber tee, are mounted stationary on the post, and register an interruption in light directed into the sensors by a moving golf club.
The light sensors are contained within light collimators or tubes having small diameter openings, and the collimator tubes are aimed downward at an angle or slope, and the LEDs are positioned lower than the collimators.
The inner walls of the collimator holes, opening 36 for example, and standoffs 52 and 53, and the interior of the collimator tubes are treated with a light absorbing material to absorb angular or reflected light, with the light absorbing material being a fl anodizing process for example.
www.freepatentsonline.com /5634855.html   (5875 words)

 Encyclopedia :: encyclopedia : Optics   (Site not responding. Last check: 2007-11-01)
The field of optics usually describes the behavior of visible, infrared and ultraviolet light; however because light is an electromagnetic wave, analogous phenomena occur in X-rays, microwaves, radio waves, and other forms of electromagnetic radiation.
Before Max Planck suggested that light is quantized, optics consisted mainly of the application of electromagnetism and its high frequency approximations to light.
Geometric optics, sometimes called ray optics is the branch of optics that describes light propagation in terms of rays.
www.hallencyclopedia.com /Optics   (670 words)

 Olympus Microscopy Resource Center: Light and Color - Electromagnetic Radiation
Light from the sun, and a majority of the common incandescent and fluorescent visible light sources, is non-polarized, while light seen through polarizing lenses of custom sunglasses is polarized in the vertical direction.
Collimated light forms a very tight beam, but does not necessarily have a narrow band of wavelengths (nor must it be monochromatic), a common phase relationship, or a defined state of polarization.
Wavefronts of collimated light are planar and perpendicular to the axis of propagation.
www.olympusmicro.com /primer/lightandcolor/electromagintro.html   (4927 words)

 U.S. Patent: 5267062 - System for backlighting LCD matrices including luminescent dots each followed by and at the ...
Since the dots are in proximity to the focal points of the lenses the lenses act to collimate the light in a direction orthogonal to the plane of the substrate on which the lenses are mounted.
The light 13 which passes through the matrix 12 is intercepted by a diffuser 14 in close proximity to the front side of the matrix 12.
The light collimating component 20 should preferably include opaque shielding areas 32 extending between the lens 24 for blocking the emission of off-axis light as illustrated by the light ray 46.
www.everypatent.com /comp/pat5267062.html   (2155 words)

 Plant Physiology Online: Working with Light
Depending on whether the light is collimated (rays are parallel) or diffuse (rays travel in random directions), values for fluence rate versus irradiance can be quite different from one another.
In oceanography and limnology, the light that travels from the water surface toward the bottom is called downwelling irradiance, and the light that travels in the reverse direction is called upwelling irradiance.
These measurements are based on the perception of light by the human eye, which is maximally sensitive to light within the green region of the spectrum, at 555 nm.
www.plantphys.net /article.php?ch=9&id=131   (1303 words)

 Optics for controlling the direction of light rays and assemblies incorporating the optics patent invention
An apparatus as in claim 1 further comprising a partially collimated light source, wherein said partially collimated light source comprises a primary optical axis and is mounted such that aid primary optical axis is substantially parallel to a surface of said reflective element.
An apparatus as in claim 11 further comprising a partially collimated light source, wherein said partially collimated light source comprises a primary optical axis and is mounted such that aid primary optical axis is substantially parallel to a surface of said reflective element.
An apparatus as in claim 20 further comprising a partially collimated light source, wherein said partially collimated light source comprises a primary optical axis and is mounted such that aid primary optical axis is substantially parallel to a surface of said reflective element.
www.freshpatents.com /Optics-for-controlling-the-direction-of-light-rays-and-assemblies-incorporating-the-optics-dt20060119ptan20060012990.php?type=claims   (2115 words)

 OLYMPUS MIC-D: Physics of Light and Color - Electromagnetic Radiation   (Site not responding. Last check: 2007-11-01)
An increase in frequency produces a proportional decrease in the wavelength of light with a corresponding increase in the energy of the photons that compose the light.
Light that has been reflected from a smooth surface at a critical angle or passed through polarizing filters assumes a plane-polarized orientation with all of the electric vectors vibrating in a single plane.
Ultraviolet light is used extensively in scientific instruments to probe the properties of various chemical and biological systems, and it is also important in astronomical observations of the solar system, galaxy, and other parts of the universe.
www.mic-d.com /curriculum/lightandcolor/electromagnetic.html   (3907 words)

 Light T4
Lighting is dictated by the application and depends on the object’s surface properties, color, background, and the data needed to extract.
This method removes the specular glare because the light reflected from a shiny surface remains polarized and, therefore, cannot pass through the cross polarizer.
The diffuse surface, however, depolarizes the light so that the light reflected from a diffused surface passes through the cross polarizer and reaches the sensor.
www.high-techdigital.com /integration/Light_t_4.htm   (490 words)

 Laser Light   (Site not responding. Last check: 2007-11-01)
In contrast to normal light, which radiates in all directions, laser light is almost completely unidirectional, which means the light travels almost completely in one direction.
All rays of light in a laser beam are in phase, which means they all interfere constructively at all times.
When light is produced in the resonating cavity, it begins to bounce back and forth between the mirrors.
www.sia.uq.edu.au /physics/light/lasers.html   (831 words)

 JAIC 1997, Volume 36, Number 3, Article 3 (pp. 207 to 230)
The assumption of collimated light incident on the glaze film is also an inaccurate representation of the combination of diffuse and oblique collimated light often used to illuminate objects.
Collimated light was directed onto a water-cooled sample tray held at 20°C with a recirculating water chiller.
Visible light intensity during the exposures was 12,600 footcandles (1.36 × 105 lux), and ultraviolet light intensity (between 300–400 nm wavelength) was 1.56 × 10−4 watts/cm2, as measured at the sample position with a radiometer.
aic.stanford.edu /jaic/articles/jaic36-03-003_appx.html   (2567 words)

 Tamarack Scientific Co., Inc.   (Site not responding. Last check: 2007-11-01)
Collimated light Exposure systems have unique imaging capabilities that allow precise feature replication over the entire exposure area with resulting high yield.
Collimated UV light passes through the mask and is imaged by the projection lens on the photoresist.
Collimated UV light passes through a mask which is imaged onto the substrate, producing a single sided exposure.
www.tamsci.com /products/products.html   (299 words)

 RPC Photonics Inc. -- How to Use Engineered Diffusers   (Site not responding. Last check: 2007-11-01)
If collimated or nearly collimated light is used to illuminate the diffuser then a lens can be placed immediately before the diffuser so a focus of the collimated ray bundles occurs at the focal plane of the lens.
Sometimes it is desirable to produce light at normal incidence to a plane whose light intensity is everywhere uniform.
Increasing the aperture of the incident light increases the illumination angle of the light at the illumination plane.
www.rpcphotonics.com /howtoed.htm   (521 words)

 A Well Collimated Quasi-Continuous Atom Laser
The differences between laser light and the light from, for example, an incandescent lamp, are apparent to anyone who has seen a laser pointer.
The laser light is very pure in color (usually red), but the lamp emits white light, a jumbled mixture of all the colors of the rainbow.
Less apparent, but just as important, is that the light waves from the laser are all in step, like a well-trained drill team marching in strict cadence, while the light bulb emits waves in a haphazard manner, like a crowd of disorderly school children running across a playground.
physics.nist.gov /Divisions/Div842/Gp4/AtomOptics/intro.html   (746 words)

 Collimated Measurements   (Site not responding. Last check: 2007-11-01)
By far the most common measurement in the measurement of optical properties is the attenuation of collimated light through a tissue.
The ratio of the light transmitted through a sample to the light incident is the collimated transmission.
The experiment is the same-transmission of collimated light through a sample is measured by taking the ratio of the collimated light passing through the sample to the total amount of light incident on the sample.
omlc.ogi.edu /software/iad/manual/node45.html   (576 words)

 Derivation of the diffusion equation
The collimated light is attenuated at a rate proportional to the transport coefficient.
The amount of collimated light entering the slab is given by Equation (4.2), less the amount of light lost to specular reflection from the surface
The reduced transport coefficient incorporates forward scattered light from the second term of the delta-Eddington phase function into the collimated beam in much the same way that such light for the first term was incorporated into expressions for the reduced scattering coefficient.
omlc.ogi.edu /pubs/prahl-pubs/prahl88/node38.html   (745 words)

 Optical devices, systems and method for producing a collimated light path patent invention
The close proximity between the source-side and detection-side fibers allows enough of the light cone emanating from the source fiber to be collected by the detection-side fiber after passing through a liquid sample.
In one aspect, the device comprises collimation optics that can collimate an optical beam from an output end of a first light path-defining element to provide a substantially collimated beam to an input end of a second light path-defining element in optical communication with a sample containment area.
In certain aspects, the optical beam may be collimated to a diameter equal to or less than about 1 mm over a distance L. In one aspect, the distance L corresponds to a distance that is greater or equal to at least one dimension of the sample containment area.
www.freshpatents.com /Optical-devices-systems-and-method-for-producing-a-collimated-light-path-dt20060413ptan20060077390.php   (1672 words)

 Polymicro Technologies > Catalog > Light Sources and Distributions
One source defines light as “the electromagnetic radiation that may be perceived by the human eye.” Light can also be defined as the form of radiant energy acting on the retina of the eye to make sight possible.
Two additional properties of light that are important in many areas of optics are the spatial distribution of the light and the coherence of the lightwaves.
The other extreme is collimated light, which essentially travels in only one direction such as a laser.
www.polymicro.com /catalog/2_2.htm   (687 words)

 B&W Photo - Printing & Finishing Forum: cold light vs condensor
However, cold lights tend to not show flaws in non-emulsion side of the negative, or flaws caused by dust that lies on top of the negative, or other minor flaws in the light path.
First, coherent light is light of a single frequency that propagates with planar wavefronts.
It's a well documented phenomenon that affects all sorts of projection systems using collimated light sources.

No. Collimated light is not entirely coherent, but it's more coherent than diffused light, due to the path length being virtually the same for all the light rays.

www.photo.net /bboard/q-and-a-fetch-msg?msg_id=004DPr   (1987 words)

 PentagonLight™ - Light Sources   (Site not responding. Last check: 2007-11-01)
Xenon lights are best known for their sun-like bright light produced by gas-filled incandenscent lamps, generating as much as 250 lumens of focused light for distance and brightness.
Luxeon Lights utilizes geniune Lumileds high flux LED as light source, which are regulated by electronic circuitry and engineered to be the high-tech flashlights of the 21st century.
The light beam color of a LED light is near pure white.
www.pentagonlight.com /feature_lightsource.shtml   (598 words)

 Visioncom - Fiber Optics Illumination
Project the shape of the target with very low divergence and are the best choice for back lighting with telecentric lenses in case of high speed applications.
Collimated light optical unit is designed for inspection the minute cracks, dents, and dirt on reflective surface, such as CDs and wafers.
it provides high luminosity line light by conversing light into a line using a combination of cylindrical lens.
www.visioncom.co.il /Illumination_Collimated.asp   (67 words)

 Self referencing retransmitting alignment sensor for a collimated light beam (US3942894)
The alignment of a collimated light beam is monitored by diverting a sample portion of the beam through an auxiliary optical light beam transmission system which converts the sample portion into an annular collimated light beam and transmits it coaxially with the main beam.
said auxiliary light beam transmission system having optical elements arranged to convert said sample portion of collimated light beam into an annular collimated beam and to transmit said annular collimated beam in proximate coaxial peripheral relationship with said collimated light beam,
means for diverting the reflected annular collimated light beam onto said first light beam angular alignment sensing means and onto said first light beam lateral displacement sensing means.
www.delphion.com /details?pn10=US03942894   (375 words)

 Optical device for the display of light data collimated to infinity (US5170153)
In an optical device for the display of light data collimated to infinity, an image generator associated with a collimation optical device gives the eye an image collimated to infinity.
The light source that illuminates the image generator is controlled so that the position of its illuminating part is such that it gives a narrow beam with an image of this illuminating part centered on the pupil of the eye.
This is possible by means of an oculometer that determines the coordinates of the center of the pupil of the eye and delivers a signal enabling an automatic control circuit to adjust the position of the illuminating part of the source accordingly.
www.delphion.com /details?pn10=US05170153   (257 words)

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