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8154715 |
Method for monitoring and measuring optical properties of device in polarization maintaining fibers by using reference fiber bragg grating and fiber components manufactured thereby
A method for measuring and monitoring the state of polarization (SOP) of a polarization maintaining (PM) fiber using a narrowband fiber Bragg grating (FBG) written on the same is provided. The PM...
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8107078 |
Detecting device and method for detecting unevenness of a glass substrate
A detecting device of unevenness of a glass substrate includes a light source emitting a light; a polarizer polarizing the light; a standard cell including opposing outer surfaces, the glass...
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8058608 |
Device for imaging scenes with very large ranges of intensity
A device for imaging scenes with a very large range of intensity having a pair of polarizers, a primary lens, an attenuating mask, and an imaging device optically connected along an optical axis....
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8045163 |
Method for producing polarisation filters and use of polarisation-sensitive photo-sensors and polarisation-generating reproduction devices
The present invention relates to methods for manufacturing polarization sensitive respectively polarizing filters and to their application to polarizing photosensors used to measure the...
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7922337 |
Method for establishing a light beam with substantially constant luminous intensity
The invention relates to a method for establishing a light beam (CLB) with substantially constant luminous intensity comprising the steps of establishing a light beam (LB) by means of a light...
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7920253 |
Polarization optical time domain reflectometer and method of determining PMD
In a method of measuring cumulative polarization mode dispersion (PMD) along the length of a fiber-under-test (FUT), a polarization-sensitive optical time domain reflectometer (POTDR) is used to...
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7911611 |
Optical system of atomic oscillator and atomic oscillator
An optical system of an atomic oscillator that regulates an oscillation frequency by using an optical absorption property by one of a double resonance method utilizing light and micro waves and a...
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7830511 |
Apparatus and method for measuring polarization direction of polarizing plate
A polarization direction measuring apparatus includes: a first polarizing plate having an unknown polarization direction about a reference axis; a sample whose polarization direction is to be...
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7821637 |
System for controlling intensity of a beam of electromagnetic radiation and method for investigating materials with low specular reflectance and/or are depolarizing
Disclosed is a system for controlling focus, angle of incidence and intensity of an electromagnetic beam over a spectrum of wavelengths, and methodology for optimizing investigation of samples...
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7791724 |
Characterization of transmission losses in an optical system
The illumination profile of a radiation beam is initially measured using a CCD detector. A reference mirror is then placed in the focal plane of the high aperture lens and the reflected radiation...
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7705985 |
Method and apparatus for testing fibres
The present disclosure relates to a method for measuring the maturity or cell wall thickening of a sample of cellulosic fiber. The method at least includes exposing the sample of fiber to polarized...
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7705986 |
Sensor unit and image display apparatus
A sensor unit for measuring a response characteristic of a polarization rotation liquid crystal cell, includes a measurement light source which emits measurement light, a first polarization plate...
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7671989 |
Information maintenance during intensity attenuation in focused beams
Maintenance of information content in a focused beam of electromagnetic radiation when the intensity thereof is attenuated by application of an aperture-like element.
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7630077 |
System and method for imaging through an irregular water surface
An underwater imaging system includes an underwater imaging polarimeter that captures images of the water surface. The captured images are indicative of the captured light, and are equivalent to...
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7619736 |
Apparatus and method for obtaining sample information by detecting electromagnetic wave
A sample information obtaining apparatus includes an electromagnetic wave generator; a sample holding unit which holds a sample to be tested and serves as a polarizer having a polarization axis...
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7586083 |
Laser sensor apparatus and method for detecting transmission shaft torque
Presented herein is a non-contact torque sensing apparatus and method for measuring the instantaneous torque, or torsional stress/strain, transmitted through an elongated power transmission member...
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7501627 |
Integrated ultra-sensitive infrared sensor
The apparatus is a miniature assembly which detects very low power infrared radiation and produces an electronic signal. The incoming infrared is combined in a wavelength multiplexer with high...
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7307722 |
Polarization stabilization
A polarization stabilizing device and method based on controlling the phase retardation of a pair of variable phase retarders with a controller such that the first of the variable retarders has its...
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7196794 |
Systems and methods for limiting power using photo-induced anisotropy
Preferred embodiments of the present invention are directed at limiting power and controlling an output intensity of an optical system using photo-induced anisotropic materials. In a preferred...
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6885466 |
Method for measuring thickness of oxide film
In a process of manufacturing a semiconductor device, after a gate oxide film is formed, the thickness of the gate oxide film is measured by measuring an exposure period defined from a time at...
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6661519 |
Semiconductor impurity concentration testing apparatus and semiconductor impurity concentration testing method
A semiconductor impurity concentration testing apparatus includes a terahertz pulse light source that irradiates terahertz pulse light on a semiconductor material, a light detector that detects...
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6455850 |
On-site analyzer having spark emission spectrometer with even-wearing electrodes
An apparatus (10) for analyzing lubricant oils and functional fluids includes an optical emission spectrometer (OES) (26) having a substantially continuously valued wavelength versus intensity...
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6330060 |
Cloud condensation nucleus spectrometer
A cloud condensation nucleus spectrometer having a streamwise segmented condensation nucleus growth column. The condensation nucleus growth column includes alternating hot and cold...
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5955377 |
Methods and kits for the amplification of thin film based assays
Method for detecting an analyte of interest, comprising the steps of providing a detection device comprising a light reflective or transmissive substrate supporting one or more layers comprising an...
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5926268 |
System and method for stress detection in a molded container
System and method for inspecting a container for defects. A first polarizer positioned between a light source and the container polarizes light provided by the light source for illuminating the...
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5894348 |
Scribe mark reader
A scribe mark reader (10) uses a source of circularly polarized light and a holographic beam-shaping optical element (40) to uniformly illuminate an area of a substrate (20) that includes a scribe...
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5870189 |
Particle monitor and particle-free recessing system with particle monitor
A particle monitor includes a light source for transmitting a light into a space over a wafer in wafer processing equipment to irradiate particles floating above the wafer for causing a scattered...
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5808745 |
Method for measuring a substitutional carbon concentration
A silicon wafer measuring method includes: (a) a first step of measuring a light transmission characteristic (IOBS) of the pulled silicon wafer by utilizing parallel polarized light incident at the...
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5682231 |
Device and method for determining contamination of a light permeable material utilizing the values of detected light below the saturation intensity of a sensor
A device and method is provided for determining the degradation of oil after use of the same in an engine or the like. A test sample material is placed in a transparent container and various...
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5666199 |
Apparatus and process for detecting the presence of gel defects in oriented sheets or films based on polarization detection
A gel defect detection system for the optical inspection of defects in oriented transparent and translucent sheet. The system utilizes two polarizing filters with adjustable orientations so that...
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5598266 |
Device for detecting defects removed from fibrous material using optical inspection
A device for detecting defects (2, 3) in fibrous materials (4, 22) includes members (16, 17) for squeezing the material against a film (1), a separating member (24) downstream of the squeezing...
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5561726 |
Apparatus and method for connecting polarization sensitive devices
A fiber optic apparatus for controlling the polarization state of light, for connecting polarization sensitive devices, and for providing a controlled variable attenuation in a fiber optic system....
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5548401 |
Photomask inspecting method and apparatus
In a photomask inspecting method, a photomask is inspected on the basis of the difference between the polarized state of elliptical light produced upon superposition of two linearly polarized light...
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5457536 |
Polarization modulation laser scanning microscopy
A polarization-modulation scanning laser microscope includes a conventional laser scanning microscope, which has been improved by addition of: a polarization state generator; a polarization state...
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5311283 |
Fiber optic probe and method for detecting optically active materials
The presence and concentration of an optically active constituent of a fluid medium is determined in-situ by immersing in the fluid medium a probe constructed to pass plane polarized light through...
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5287167 |
Method for measuring interstitial oxygen concentration
The invention related to a method for determining a silicon wafer in which the interstitial oxygen concentration of a pulled silicon wafer is calculated on the basis of a light transmission...
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5210417 |
Modulated high sensitivity infrared polarimeter
A modulated Faraday rotation signal is produced by passing a linearly polarized laser beam through a semiconductor wafer sample in a modulated magnetic field that is induced in an electromagnet by...
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5128797 |
Non-mechanical optical path switching and its application to dual beam spectroscopy including gas filter correlation radiometry
A non-mechanical optical switch is provided for alternately switching a monochromatic or quasi-monochromatic light beam along two optical paths. A polarizer polarizes light into a single, e.g.,...
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5022765 |
Nulling optical bridge for contactless measurement of changes in reflectivity and/or transmissivity
A nulling optical bridge is disclosed herein for the measurement of the difference in the relative power of more than one light beam. The bridge can be used to precisely measure the change in...
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4857738 |
Absorption measurements of materials
Two methods of determination of the chemical changes induced in a film of material such as photoresist that has been exposed to electromagnetic radiation. Two methods use measurement of polarized...
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4523849 |
Front lighted optical tooling method and apparatus
An optical tooling method and apparatus uses a front lighted shadowgraphic technique to enhance visual contrast of reflected light. The apparatus includes an optical assembly including a fiducial...
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4035083 |
Background correction in spectro-chemical analysis
Various methods and apparatus are disclosed for providing a background corrected measure of the concentration of a sample element in absorption and emission spectro-chemical analysis using the...
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4011014 |
Polarization rotation analyzer
A machine for testing polarization rotation by translucent specimens includes a standard spectrophotometer disposed for establishing and converging a pair of light beams from a single monochromatic...
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3985447 |
Measurement of thin films by polarized light
In order to measure the thickness and refractive index of a thin film on a substrate, such as a film of silicon dioxide on a substrate of silicon, a beam of substantially monochromatic polarized...
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3982836 |
Method and means for enhancing prints for direct comparison
A method and apparatus for enhancing prints, such as fingerprints, for direct comparison. The method utilizes a transparent pressure-sensitive gel to capture a print pattern. A polarized beam of...
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3970967 |
Controllable ultrafast light shutter
A controllable ultrafast light shutter utilizes two sets of Pockels cell-polarizer combinations, one set is used to open the light switch, the other to close the switch allowing the selection of...
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3938890 |
Torque transducer utilizing differential optical sensing
Torque stress on a stationary or rotating shaft is measured in a contactless fashion utilizing differential optical sensing means. A pair of light-controlling discs are attached to opposite ends of...
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3806257 |
OPERATOR VIEWING OPTICS FOR A SLIDE CLASSIFICATION SYSTEM
In a system producing an electrical output representing the characteristics of a blood smeared slide, an optical system permits an operator to comfortably view the slide while it is being intensely...
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3707329 |
APPARATUS FOR ELECTRONICALLY ANALYZING MODULATED LIGHT BEAMS
Apparatus for analyzing a light beam modulated by a quantity to be measured in which two parallel electrical signals are derived from the modulated beam, the signals being shifted in phase relative...
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3656854 |
GLASS DEFECT DETECTION SYSTEM
A glass-defect detection system comprising a light source, a stationary disc, a scanning disc and a photomultiplier. A light beam is transmitted from the light source through the piece of glass...
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