1241 results about "Integrating sphere" patented technology

The present invention is intended to provide an image pickup device-equipped rear view mirror with improved image pickup performance, glare prevention and appearance (design) in addition to improved performance as a vehicle mirror. A mirror element is formed by forming a reflecting film consisting of high refractive index material films and a low refractive index material film on a back surface of a transparent glass substrate. The integrating sphere reflectance of the mirror element in the visible range is 40% to 60% and the near-infrared transmittance is no less than 70% for the whole or part of the band belonging to the near-infrared range within the entire sensitive wavelength range of the near-infrared camera. A black mask member is attached to an entire back surface of the reflecting film. The near-infrared camera is arranged behind the black mask member. The region corresponding to the area for the image-pickup by the near-infrared camera within the entire region of the black mask member is formed of a visible-light absorption and near-infrared transmission filter. The near-infrared transmittance of the visible-light absorption and near-infrared transmission filter is no less than 70% for the whole or part of the band belonging to the near-infrared range within the entire sensitive wavelength range of the near-infrared camera.

A photovoltaic module for converting laser radiation from a laser emitting light at a wavelength to electrical power is provided. The module comprises: (a) a housing having a cavity of generally optimized closed shape inside the housing, the cavity having an internal surface area A_s and including an opening for admitting the laser radiation into the cavity, the opening having an entrance aperture area A_i that is substantially smaller than A_s; and (b) a plurality of photovoltaic cells within the cavity, the photovoltaic cells having an energy bandgap to respond to the wavelength and generate the electrical power.

The invention provides a full-screen color correction method for an LED display and an implementation system thereof, wherein the system comprises a correcting computer, a camera, an optical tester, an integrating sphere, a display control computer, an LED controller and a scanning control panel, wherein the camera and the optical tester respectively carry out parameter sampling on the partitions and full screen of the LED display, and after correction of brightness and chromaticity on the pixel level and the module level of the partitions and the full screen on the correcting computer, the corrected data are transmitted to the scanning control panel of the LED display and stored. The full-screen color correction method and the implementation system thereof of the invention realize full-screen color correction of the LED display, and overcome the defect that after LED modules are corrected one by one by a conventional discrete correction method, when the time, environment and operation are inconsistent, individual LED modules have brightness or chromatic aberration observable by naked eyes, thereby improving the correction quality and correction efficiency.

The invention discloses a method for nondestructively measuring main fatty acid content of peanut seeds. The method comprises the following steps of: based on the Fourier transform near-infrared diffuse reflection spectrum technology, scanning spectrums by adopting a best integrating sphere diffuse reflection mode for eliminating solid granule non-uniformity, establishing a multiple regression mathematical model by using full peanut seeds of multiple genotypes as standard sample sets, and predicting the main fatty acid content of an unknown sample through the model. The method is nondestructive, does not need to treat the sample, and does not harm the vitality and tissue structure of the seeds. The method has the advantages of simple operation, high sensitivity, high scanning speed, good signal-to-noise ratio and high measurement speed, and is suitable for high oleic acid quality breeding, germ plasm resource identification and inheritance rule research of peanuts.

The invention belongs to the field of optical parameter measurement in tissue optics research, and relates to a multi-wavelength tissue optical parameter trans-construction method based on a neural network. The method comprises: using double integrating sphere technology and a high-sensitivity photoelectric detector to collect reflected light and transmitted light on the surface of a tested sample, and using a method of relative measurement to obtain the reflectivity, diffuse transmittance and collimation transmittance of the sample; using a Monte Carlo method to establish a mapping model of a tissue optical parameter (mua, mus and g) to a measurement amount (Rd, Td and Tc); establishing a BP neural network containing two buried layers, and adopting a gradient descent weight learning function to train a BP network; and predicting the optical parameter of the measured sample through the (Rd, Td and Tc) obtained by measurement in real time, wherein an input signal of the neural network is (Rd, Td and Tc), and an output signal is (mua, mus and g). The invention provides a device adopted by the method at the same time. The method provided by the invention can quickly and accurately measure the tissue optical parameters under multi-wavelength.

This invention describes an improved method and apparatus for the analysis of fluid borne particles and which is especially suitable for the detection of airborne biological particles. In one aspect the invention provides an apparatus for the detection of fluid borne particles which comprises: a zone through which a fluid to be analysed flows, in use; a source of illumination to illuminate/irradiate fluid borne particles present in said zone; and a detector to detect light from the particles as an indicator of the presence or characteristics of the particles, wherein the apparatus comprises an integrating sphere and the zone is within the integrating sphere. The apparatus is highly sensitive and can be used for detecting airborne particles even where the particles are present at very low particle concentrations in the air.

The present invention relates to an integrating sphere for measuring a light-emitting property of a light source, and more particularly, to an integrating sphere having a means for controlling temperature inside the integrating sphere. An integrating sphere for measuring an optical property of a light source according to the present invention has a substantially spherical hollow space formed therein; a first through-hole provided such that a wire for supplying electric power to the light source installed inside the hollow space of the integrating sphere passes therethrough; and a second through-hole provided such that temperature-controlled air is supplied into the hollow space of the integrating sphere therethrough. A light source support, which has one end disposed at the center of the hollow space of the integrating sphere and the other end fixed to an inner peripheral surface so as to hermetically seal the first through-hole of the integrating sphere, is installed within the hollow space. The integrating sphere includes an air supply tube fixed to an outer peripheral surface of the integrating sphere where the second through-hole is formed, so that air can be supplied to the interior of the integrating sphere through the second through-hole; an air supply means for supplying air to the air supply tube; a temperature control means for controlling the temperature of air being supplied from the air supply means and passing through the air supply tube; and a shielding plate installed to be spaced apart by a predetermined distance from the second through-hole.

A method to change the color of hair. The method includes measuring an initial reflectance spectrum of a sample of the hair and analyzing a contribution of a plurality of natural hair factors to the initial reflectance spectrum. The method also includes calculating a hair treatment based on another reflectance spectrum. A system to measure a reflectance spectrum of a sample includes an integrating sphere having a sampling port and an inner surface and a window disposed near the sampling port. The window is configured for being placed in close contact with the sample. The system also includes a light source configured to project light onto the sample via the window and a light detector configured to analyze light reflected from the inner surface to produce the reflectance spectrum of the sample.

The invention discloses a measurement device and a measurement method of optical parameters of a dielectric film. The measurement device comprises a sample platform assembly for placing a sample, a refractive index and thickness measurement assembly, a transmissivity and refractive index measurement assembly and a controller, wherein the refractive index and thickness measurement assembly is formed by a laser light source assembly, a polarizer, a semi-permeability and semi-reflection mirror, a circular hole diaphragm, an automatic-collimation detector and a measurement detector; and the transmissivity and refractive index measurement assembly is formed by a white-light light source, a collimation lens set which is connected with the white-light light source and is used for a collimation light path, an integrating sphere which is used for collecting light transmitted or reflected by the sample placed on the sample platform assembly, and a spectrograph connected with the integrating sphere. The measurement device disclosed by the invention has the advantages that the refractive index and thickness measurement assembly can measure the reflective index and the thickness of the sample, and the transmissivity and refractive index measurement assembly can measure the transmissivity and the refractive index of the sample, so that the measurement of various optical parameters is realized and the measurement precision is high.

The invention discloses a spectrum programmable light source system applied to hyper-spectrum calibration. The spectrum programmable light source system applied to hyper-spectrum calibration comprises a light source. An optical filter, a collimation system, a cylindrical lens coupled system, a slit, a collimation objective and a dispersion element are sequentially placed on a light path in front of the light source, an imaging system and a digital micromirror device are sequentially arranged on a light path in front of the dispersion element, a light collection lens and an optical fiber coupler are arranged on a light path of useful light modulated by the digital micromirror device, wherein the optical fiber coupler is connected with a integrating sphere, a light splitting radiometer is arranged on the integrating sphere, and feedback control is conducted and target spectrums are simulated through a spectrum simulation program and monitoring the light splitting radiometer. A focusing system and a garbage light collector are sequentially arranged on a light path of garbage light modulated by the digital micromirror device, and the garbage light is eliminated. The spectrum programmable light source system applied to hyper-spectrum calibration can simulate accurately the target spectrums and reduce the effect of inconsistence of calibration light source spectrums and the target spectrums to a calibration result. The spectrum programmable light source system applied to hyper-spectrum calibration accurately measures radiation quantity, and is favorable to improving optical radiation calibration accuracy of a sensor.

The invention relates to an absolute spectral radiance luminance responsivity calibrating system utilizing a wide tunable laser, which comprises a two-dimensional moving platform, wherein the two-dimensional moving platform is controlled by a computer through a stepping motor control box; a standard detector and a detector to be calibrated are arranged on the two-dimensional moving platform. The absolute spectral radiance luminance responsivity calibrating system also comprises a calibrating light source, wherein the calibrating light source comprises an integrating sphere and a tunable lasersystem; the emitting light of the tunable laser is guided into the integrating sphere and emitted at a light outlet of the integrating sphere to form the calibrating light source; the standard detector and the detector to be calibrated are sequentially aligned to the center of the light outlet of the integrating sphere to detect by the motion of the two-dimensional moving platform; the standard detector calibrates the absolute spectral radiance luminance of the light source of the integrating sphere, and a response signal of the detector to be calibrated is divided by the absolute spectral radiance luminance of the light source of the integrating sphere to obtain the absolute spectral radiance luminance responsivity. The invention can carry out whole machine calibration on a wave band typeradiance luminance detector, the calibrating parameter comprises the absolute spectral radiance luminance responsivity, and the stability and the linearity of the responsivity, and the calibrating precision of the spectral radiance luminance responsivity is effectively improved.

The invention discloses a spectrum scaling apparatus used for a spectrum imager. The apparatus is characterized in that: a light beam which is emitted by a broadband light source (1) goes through a diaphragm (2) and a collimating lens (3) and irradiates a wavelength tuning optical filter (4), a plurality of narrowband optical signals which are distributed in a comb-shaped mode and have different wavelengths are outputted, after light intensity adjusting by a broadband bandpass optical filter (5), the signals enter into an integrating sphere (9) from an integrating sphere incident light hole (6) for depolarization and space uniformity processing, and an integrating sphere light extraction hole (8) outputs a surface light source. A spectrum imager to be measured is placed on the light extraction hole (8) for spectrum scaling. According to the apparatus, a birefringence crystal is utilized to carry out light transmission rate modulation, a passband peak value position and a bandwidth size can be adjusted, a plurality of narrowband light intensity signals changing with a wavelength are provided in a broadband range, wavelength scanning is not needed when carrying out spectrum scaling on the spectrum imager, wavelength scaling with one-time imaging is realized, and the apparatus is suitable for scaling a large field of view and large caliber spectrum imager.

The invention discloses a middle/high-temperature infrared emissivity testing device. The middle/high-temperature infrared emissivity testing device comprises an infrared reflectivity testing system, a sample heating control system and a microcomputer data processing system. The infrared reflectivity testing system comprises an infrared source, an interferometer, an intermediate infrared integrating sphere, an infrared detector, an A/D convertor and a liquid nitrogen cooling device. The sample heating control system comprises a sample heating table, a communication convertor, a temperature controller, a silicon-controlled voltage regulator, a sample heater and an indicator light, wherein the communication convertor, the temperature controller, the silicon-controlled voltage regulator, the sample heater and the indicator light are orderly connected. The temperature controller is connected to a precision thermocouple. The microcomputer data processing system is used for inputting preset parameters and acquiring and treating data. The middle/high-temperature infrared emissivity testing device is simple, can be used conveniently, can realize fast and accurate measurement of infrared emissivity of a material in a middle/high-temperature range of 20 to 600 DEG C, and can be used for the field of key development of middle/high-temperature solar photo-thermal coatings.

An apparatus and method for fluorescence spectral and color measurements of diamonds, gemstones and the like. The apparatus comprises a spectrometer, and computer and a dual integrating sphere measurement arrangement comprising a measurement integrating sphere, a sample integrating sphere, a sample platform, a lens system, a baffle, an ultraviolet radiation source on the top of the sample integrating sphere, and another light source attached to the measurement integrating sphere. The sample on the sample platform is radiated by the ultraviolet radiation source on the top of the measurement integrating sphere. The sample emits fluorescent light into the measurement integrating sphere, and the fluorescent light is received by the lens system. The spectrometer separates the fluorescent light into spectral signals, and the computer calculates the fluorescence spectrum and colorimetric data.

A polarization precision calibrating system of a polarity spectrometer comprises an integrating sphere, a collimator tube, a diaphragm, an interference absorber, a polarization state generator (PSG), a polarization-preserving diffuser, a collimating lens, a polarization state detector, a reference light intensity probe and a computer. The calibrating system adopts the integrating sphere, the collimator tube, the diaphragm, the interference absorber and the polarization state generator (PSG) to generate standard polarization calibration sources; and a zero vision field and a small-caliber parallel light beam generated by the calibration sources are expanded into a full vision field and a large-caliber parallel light beam with the same polarization state, so as to carry out full vision calibration to the large-caliber polarity spectrometer. The invention has a capacity of carrying out the full vision polarization calibration to the large-caliber polarity spectrometer, adopts a unequally accurate least square principle to process data during the calibration process, and greatly improves the polarization calibration accuracy of an imaging polarity spectrometer.

The invention discloses an LED (light emitting diode) service life test system, which comprises refrigerators, aluminum printed circuit boards (PCBs), a cold and hot two-region temperature box and an integrating sphere. An electric refrigerating plate and a subpanel of the refrigerator are fixedly installed on a radiator and the electric refrigerating plate is embedded into an opening of the subpanel. The aluminum PCB is fixed on the surface of the electric refrigerating plate. The cold and hot two-region temperature box comprises cold and hot boxes isolated by an insulation board. The insulation board and the integrating sphere are provided with installation holes for installing the refrigerators. When the refrigerators are respectively installed on the installation holes of the temperature box and the integrating sphere, the radiators are respectively placed outside the cold box and the integrating sphere while the aluminum PCBs are respectively placed inside the hot box and the integrating sphere. The refrigerators provided by the invention can move integrally without disassembling the LED, which facilitates the LED service life test greatly. In addition, each LED can be independently lighted by connecting a lead wire at the connection solder joint of the aluminum PCB to a switching circuit, thereby achieving the aim of testing the parameters of light, color and electricity of each LED independently.

A novel cassette structure technique for enabling simultaneous burn-in of pluralities of LEDs plugged into the cassettes, and then, with the cassettes mounted within a light integrating sphere system, separately measuring the spectral flux emitted by each successive individual LED plugged into the cassette to determine optical and electrical characteristics of each LED separately from the others.

A method and apparatus for reducing speckle during inspection of articles used in the manufacture of semiconductor devices, including wafers, masks, photomasks, and reticles. The coherence of a light beam output by a coherent light source, such as a pulsed laser, is reduced by disposing elements in a light path. Examples of such elements include optical fiber bundles; optical light guides; optical gratings; an integrating sphere; and an acousto-optic modulator. These various elements may be combined as desired, such that light beams output by the element combinations have optical path length differences that are greater than a coherence length of the light beam output by the coherent light source.

The invention relates to a platform for testing performance of a camera based on an EMVA1288 standard. The method is used for testing the performance of the camera to be tested. The platform comprises an integrating sphere, a camera obscure, an optical power meter arranged in the camera obscure, a computer control system and a bracket, wherein a light inlet hole is formed in the camera obscure; the light inlet hole is matched with a light outlet hole of the integrating sphere; a double-dick filtering component and the camera to be tested are sequentially arranged in the camera obscure along an optical shaft direction of the light outlet hole of the integrating sphere; the double-dick filtering component comprises an optical filter and an attenuation sheet; the optical power meter is positioned between the double-dick filtering component and the camera to be tested and is far away from the optical shaft; the optical filter, the attenuation sheet, the optical power meter and the camera to be tested are arranged on the bracket and are connected with the computer control system; the computer control system calculates and processes attenuation values of light intensity and brightness, and the light power data monitored in real time so as to obtain the performance parameters of the camera to be tested specified in the EMVA1288 standard. The testing platform can test all the parameters specified in the EMVA1288 standard, and is simple in structure and low in cost.