Abstract:
The invention relates to photonic crystals which have units having a refractive index of greater than 3 and units having a refractive index of less than 1.6 in a periodic sequence and separations of the individual units of from 1 to 20 μm, and also to the use of these photonic crystals.
Abstract:
A system and method for analysis of minute quantities of contaminants in water. Liquid water is converted to water vapor and then excited into a plasma state with microwave radiation. Optical emissions from the plasma are spectrally analyzed to provide qualitative and/or quantitative analyses of the contaminants in the water. Preferred embodiments provide special techniques for generating the water vapor from a water stream; exciting the water vapor to a plasma state; varying and controlling the plasma energy; introducing samples into an existing plasma; collecting emissions from the plasma from a variety of angles; selecting the optical collection angles; protecting the analysis optics from the plasma; exhausting the spent plasma gases back into the water stream; and analyzing the results to yield concentrations of elements and molecules in the sample.
Abstract:
A UV disinfection device having a contact chamber, the chamber being a container with an interior, a top portion and a bottom portion. A partition is positioned in the interior to form a first and second chamber, where the first and second chambers are in fluid communication near the bottom portion of the container. The container has an inlet in one of the first or second chambers, where the inlet is formed in the container near the top portion. The device includes an outlet in the other of the first or second chambers, and an ultraviolet lamp is positioned in either the first or second chambers.
Abstract:
A solar calibration device for a remote sensor having a housing having a deployable door at one portion of the housing and an aperture at another portion of the housing is provided. Disposed in the housing is a solar diffuser for receiving solar irradiance when the deployable door is in an open position, and diffusely reflecting the received solar irradiance. A solar diffuser monitor also disposed within the housing receives diffusely reflected solar irradiance from the solar diffuser, for calibrating the solar irradiance reflected from the solar diffuser, and receives solar irradiance directly from the sun through the aperture to calibrate the spectral reflectance of the solar diffuser monitor detectors based on the solar irradiance received directly from the sun.
Abstract:
The invention pertains to mechanisms for protecting surfaces of optical components of an optical inspection system. One aspect of the invention relates to a gas purge system that produces a gas stream that blocks contaminants from reaching the optical surfaces of the optical components and that transports contaminants away from the optical surfaces of the optical components. Another aspect of the invention relates to a transparent cover that physically blocks contaminants from reaching the optical surfaces of the optical components. Yet another aspect of the invention relates to a combination of the gas purge system and the transparent cover.
Abstract:
A high dynamic range integrated (HDRI) receiver includes a variable optical attenuator (VOA) for attenuating an incoming optical signal before the optical signal is directed to a photo-detector for conversion into an electrical signal. An optical block receives the optical signal from an optical fiber and includes optics for directing the optical signal to the VOA, and for directing the optical signal from the VOA to the photo-detector.
Abstract:
An apparatus for selectively limiting undesired radiation from a scene which, in one embodiment, includes an optic that is operative to attenuate radiation by selectively losing transparency in response to radiation within a first wavelength band from a source. The loss of transparency affects the passage through the optic of radiation within a second wavelength band from that source. The optic can be positioned between a sensor and the scene such that the sensor is configured to receive radiation from the scene through the optic. In one embodiment, an optical limiter includes a plurality of such optics, wherein the optical limiter is configured to facilitate transmission of light corresponding to a scene, and wherein each optic is configured to receive a respective portion of the light corresponding to a respective portion of the scene. A light detector assembly and a method of limiting light energy are also included.
Abstract:
A photosensor cover and kit for detecting a malfunction in a lighting system, wherein the lighting system comprises an illuminator and a photosensor. The photosensor comprises a photocell that detects a threshold amount of light and electronic circuitry in communication with the photocell that signals the illuminator to turn on/off when the threshold amount of light has been detected by the photocell. The photosensor cover comprises a cap comprising: a barrier layer comprising an opening, wherein the barrier layer is disposed over the housing body such that the barrier layer covers the photocell. The photosensor cover further comprises an adjustment element that allows for the expansion or contraction of the opening, and wherein the adjustment element assists in preventing the threshold amount of light from reaching the photocell.
Abstract:
An auto darkening eye protection device including a shutter assembly, a light sensing circuit, a control circuit and a power supply source. The shutter assembly is adjustable to a plurality of shade levels. The phototransistor of the light sensing circuit senses light from a welding arc and provides an output of the light sensing circuit indicative of the shade level at which the shutter assembly should be operated. The phototransistor is configured for surface mount and has an external base connection connected to the base of the phototransistor. The control circuit is configured to receive the output from the light sensing circuit and provide a drive signal to the shutter assembly responsive to said output, drives the shutter assembly to one of said plurality of shade levels. The present invention provides reduced power consumption, improved attenuation of low intensity light signals, a sharp rise time from the phototransistor in response to high intensity light, and allows implementation into a smaller sleeker eye protection device.
Abstract:
An auto darkening eye protection device including a shutter assembly, a light sensing circuit, a control circuit and a power source. The shutter assembly is adjustable to a plurality of shade levels. The light sensing circuit senses light from a welding arc and providing an output indicative of the shade level at which the shutter assembly should be operated, the light sensing circuit includes a phototransistor operative to receive the light from the welding arc and produce a phototransistor output representative thereof. The phototransistor output from the phototransistor is used to form the output of the light sensing circuit. The phototransistor is configured for surface mount and has an external base connection connected to the base of the phototransistor. The control circuit is configured to receive the output from the light sensing circuit and provide a drive signal to the shutter assembly responsive to said output. The drive signal is operative to drive the shutter assembly to one of said plurality of shade levels. The power source is coupled to the light sensing circuit and control circuit for powering same. The present invention provides reduced power consumption, improved attenuation of low intensity light signals, a sharp rise time from the phototransistor in response to high intensity light, and allows implementation into a smaller sleeker eye protection device.