82 results about "Light irradiance" patented technology

The invention provides a grid-connected solar photovoltaic power station monitoring system which can monitor the temperature of a photovoltaic array group string, an output current voltage and direct current (DC) combiner box, a DC combiner box, a DC power distribution cabinet, an inverter, an alternating current (AC) power distribution cabinet, in-out current voltages of a boosting transformer, input current voltages of a grid-connected point, and the environment temperature, the light irradiance and the wind speed and direction of the solar photovoltaic array group string. Measured data of all the components are gathered comprehensively, essential information of a power station, test data of monitored components and environment meteorological data are displayed and stored in real time, information such as the running conditions of the monitored components and the performance ratio of the power station is calculated out, and an actual measurement operational data base of the power station is established. The components of the photovoltaic power station and the performance and the reliability of the system are estimated comprehensively, the optimization design of photovoltaic components and the system is promoted, and real and reliable data support is provided for the research and development and the improvement of photovoltaic power generating technology.

The invention discloses a medical display, a method of controlling brightness of a display screen of the medical display, and a device, so as to solve the problem of high equipment operation complexity existing in the prior art. The method comprises steps: ambient light illuminance of each display region of the display screen is acquired, wherein the display screen is divided into at least two display regions; as for each display region, whether the ambient light illuminance acquired at the time and the ambient light illuminance acquired at the former time are in the same ambient light illuminance range is judged; and as for a display region whose ambient light illuminance acquired at the time and whose ambient light illuminance acquired at the former time are not in the same ambient light illuminance range, the backlight brightness of the display region is adjusted to be the backlight brightness corresponding to the ambient light illuminance range in which the ambient light illuminance acquired at the time is, and according to the backlight brightness after adjustment, the grayscale brightness of each pixel of the display image of the display region is calibrated.

Various aspects provide for genetically modifying photosynthetic cells. In some cases, an integrated light harvesting efficiency of photosynthetic cells may be increased by reducing the amount of incident light that is absorbed but not used for photosynthesis. In some cases, an increased transparency may be associated with an increased light harvesting efficiency when absorption due to non-photosynthetic processes is reduced. A reduced capacity of various light-harvesting antenna apparatus may increase transparency. In some cases, a capacity of an organism to adapt to varying light levels may be reduced, and in certain cases, a modified organism may have a reduced ability to acclimate to a low light irradiance.

In a method of calibrating a light delivery device (10) having a solid state light source (12), for example comprising LEDs of an LED array, and an intensity control unit (16) comprising LED array driver and a dimmer module for generating a control signal for controlling at least the intensity of the light source, the light source is temporarily connected by a light guide (24; 24, 26) to a radiometer (38) for detecting irradiance of the delivered light. The light delivery device has a memory (30) for storing control signal parameters and associated radiance levels. The light delivery device is calibrated by adjusting the control signal parameters, e.g. a PWM duty cycle of a control signal to each of a series of predetermined settings, obtaining from the radiometer a corresponding series of delivered light irradiance levels measured thereby, storing the irradiance levels and associated control signal parameters in memory, and applying a best fit algorithm to the irradiance measurements and control signal parameters. Thereafter, a desired irradiate level can be set by selecting the best fit control signal parameters, such as duty cycle of a PWM control or other parameters. Output intensity levels may be measured at the same time as the irradiance levels and used to compensate for light source output level changes when setting a desired irradiance level.

In an example embodiment, a system detects the degree of rotation of a knob, the system comprises a shaft having a length and a first end and a second end; the second end has an oblique reflective surface defined thereon; the first end fixedly attached to the knob. Containing the shaft is a rotation body, having a receptacle to accommodate the second end of the shaft with the oblique reflective surface exposed. An integrated circuit optical module is optically coupled the rotation body and the optical module detects light irradiance profile from the oblique reflective surface. The optical module includes a solid state light source and a plurality of photo detectors which generate an electrical signal upon exposure to light. As the knob is rotated, the oblique reflective surface generates a changing asymmetric irradiance profile, the change being translated into an electrical signal via the photo detectors. The electrical signal corresponds to the degree of rotation of the knob.

The invention is a method of irradiating at least one surface of a three-dimensional object (36, 114) with a desired ultraviolet light irradiance flux produced by an ultraviolet light source (22, 102). The invention determines a position at which the three-dimensional object will be positioned relative to the ultraviolet light source when the at least one surface (35, 113) is to be irradiated with the desired ultraviolet light flux; determines an unmodified ultraviolet light flux which would irradiate the at least one surface when the ultraviolet light source is activated while the three-dimensional object is at the position relative to the ultraviolet light source; produces an optical element (30, 112), based upon the unmodified ultraviolet light flux and the desired ultraviolet light fluxes, which provides a modified wavefront of the ultraviolet light flux to irradiate the at least one surface with the desired ultraviolet light flux; positions the optical element in the path which the wavefront of the ultraviolet light from the ultraviolet light source would follow in irradiating the at least one surface; and activates the ultraviolet light source to image transmit the ultraviolet light flux from the ultraviolet light source on to the optical element to cause irradiation of the at least one surface with the desired light flux.

A light delivery device (10) having a light source (12) and a variable aperture unit (18) is temporarily connected by a light guide (24; 24, 26) to a radiometer (38) for detecting irradiance of the delivered light. The light delivery device has a memory (30) for storing irradiance levels. The light delivery device is calibrated by adjusting the aperture to each of a series of predetermined settings, obtaining from the radiometer a corresponding series of delivered light irradiance levels measured thereby, storing the irradiance levels and aperture settings in memory, and applying a best fit algorithm to the irradiance measurements and aperture settings. Thereafter, a desired irradiance level can be set by selecting the best fit aperture setting. Output intensity levels may be measured at the same time as the irradiance levels and used to compensate for light source degradation when setting a desired irradiance level.

The invention provides a decohering and shimming device, which comprises a diffuse-reflection plate, a total-reflection cavity and a homogenization lens. The decohering and shimming device utilizes a light beam guiding device to guide a light beam to be processed to the diffuse-reflection plate, and the light beam to be processed forms a plurality of beams of scattered light after the diffuse reflection of the diffuse-reflection plate; the plurality of beams of scattered light are totally reflected once or for several times on the sidewall of the total-reflection cavity along respective different propagation paths in the total-reflection cavity; optical path difference between every two beams is randomly modulated and is incoherent so that the light beams emergent from emergent ports of the total-reflection cavity are incoherent light; and then the incoherent light forms the light beams with uniformly distributed illumination in a target area through the homogenization lens. In addition, the decohering and shimming device also can adopt a mechanical means to change an incident point of the light beam to be processed on the diffuse-reflection plate all the time so as to improve the decohering effect.

A includes a shaft having a length, a first end, and a second end; the second end has an oblique reflective surface defined thereon; the first end fixedly attached to the knob. Containing the shaft is a rotation body, having a receptacle to accommodate the second end of the shaft with the oblique reflective surface exposed. An integrated circuit optical module is optically coupled to the rotation body. The optical module detects a light irradiance profile from the oblique reflective surface and includes a solid state light source and a plurality of photo detectors which generate an electrical signal upon exposure to light. As the knob is rotated, the oblique reflective surface generates a changing asymmetric irradiance profile, the change being translated into an electrical signal via the photo detectors, which signal corresponds to the degree of rotation of the knob.

In one embodiment, an optical transducer, such as an infrared transducer, generates an output signal that is representative of optical irradiance. A noise control circuit is coupled in a power supply path of the optical transducer. A switching circuit varies the noise control provided by the noise control circuit, in response to changes in the output signal of the optical transducer. The noise control may be varied in a number of different ways, including: turning the noise control on or off, varying the noise control in discrete steps, or varying the noise control in a continuous manner. Methods for varying noise control in response to optical irradiance of an optical transducer are also disclosed.

A control device for high-beam and low-beam lights comprises a first sensor, a second sensor and a control module. The first sensor is used for acquiring ambient light intensity. The second sensor is used for acquiring vehicular front light intensity. The control module is used for acquiring the ambient light intensity acquired by the first sensor and the vehicular front light intensity acquired by the second sensor, determining the current specific night environment according to the ambient light intensity, and switching the high-beam and low-beam lights according to the current specific night environment and the vehicular front light intensity. Therefore, when vehicles meet with one another, the high-beam and low-beam lights are controlled to switch by determining the current specific night environment according to the data acquired by the first sensor and using the data acquired by the second sensor. The control device and the control method can be used to switch the high-beam and low-beam lights more accurately.

The invention discloses a large-caliber rotationally symmetric non-imaging free-form surface reflector and a design method thereof, and belongs to the field of concentrating photovoltaic power generation. Through a light spot which needs to be obtained, is uniformly reflected onto a receiving surface and fully adapts to the shape of the receiving surface, based on a non-imaging reflector principle, firstly a two-dimensional curve is designed and obtained, then quadratic term fitting is performed to the two-dimensional curve by adopting a mathematic modeling method to obtain an equation, the equation is used as a generatrix equation, the generatrix equation is rotated symmetrically to obtain a free-form surface and the free-form surface is the surface pattern of the non-imaging free-form surface reflector. The large-caliber rotationally symmetric non-imaging free-form surface reflector and the design method thereof have the advantages that not only can the uniform light spot be obtained, but also the large-caliber reflector manufacturing process can be simplified to achieve a high-accuracy surface pattern, the light irradiance is uniform and the light-electricity conversion efficiency is improved.

The present invention discloses a non-destructive method and apparatus for measuring the 3D topography of a sample having periodic microstructure deposited onto the surface, or deposited onto a film, or buried into the film or sample. In particular, the present invention relates to an optical system and method utilizing polarized light beam, diffracted from the repeated structure, to measure its spatial geometry giving parameters such as profile height, profile widths, sidewall angles, and arbitrary profile shape. The optical system employs a broadband or semi-monochromatic light source to produce a light beam that is polarized and focused onto the periodic structure being measured. The focused beam consists of a whole range of illumination angles that is provided to the structure simultaneously. Transmitted or reflected diffracted light generated by the interaction of the light with the periodic structure is collected by an imaging detector system. The detector records the diffraction light irradiance resolved into illumination angles, diffraction orders and wavelength. The data is applied to determine the geometrical profile of the periodic structure using a reconstruction algorithm that is based on comparisons between measured diffraction data and modeled diffraction irradiance of a profile model using Maxwell's equations. The reconstruction of the profile is performed by iterative adjustments of a profile seed model until the modeled diffraction irradiance matches the measured data within a predefined convergence tolerance.

The invention provides a portable solar absorptance testing instrument which comprises a control system, a constant-current drive source, an LED solar simulative light source, an integrating sphere and a detector. The control system controls the constant-current drive source to drive the LED solar simulative light source, receives an illuminance output signal and outputs solar absorptance of a sample to be tested under the current wavelength. The constant-current drive source drives the LED solar simulative light source to generate a light source at a set waveband. The LED solar simulative light source is embedded in a light source hole of the integrating sphere, generates the light source at the set waveband and outputs the light source. The integrating sphere is provided with the sample to be tested, a detector hole and the light source hole. The detector detects diffuse reflection light of the inner wall of the integrating sphere and generates the illuminance output signal. A light-emitting device covering a broadband light source, the detector and the large integrating sphere are used, a high-diffuse-reflection polytetrafluoroethylene material high in reflection is pressed on the inner wall of the integrating sphere, the detector or the light-emitting device is installed on the outer wall of the integrating sphere, and the testing instrument has the advantages of being wide in spectral range, compact in structure, good in solar spectrum fitting characteristic and high in measurement precision.

The invention discloses an LED bulb lamp which comprises an optical lens, a heat dissipating body, a driver, an LED light source, a lamp head, and a lamp seat. The LED bulb lamp is characterized in that the optical lens is arranged at one end of the heat dissipating body, the lamp seat is arranged at the other end of the heat dissipating body, the driver is arranged in an inner cavity of the lamp seat, the outer end of the lamp seat is connected with the lamp head in a riveting mode, and the LED light source is arranged on the inner surface of the heat dissipating body at the lower end of the optical lens. The LED bulb lamp can greatly improve luminance, enables a main illuminating face to be clearer in focus, increases a light illuminating area, increases a lighting face, eliminates glare, improves visual effect, and eliminates visual fatigue. The LED bulb lamp saves energy, protects the environment, and is long in service life and free of stroboflash.

The invention provides a photovoltaic power station online operation and maintenance method and system based on infrared and visible light images. The method comprises the following steps: collectingan infrared image and a visible light image of a photovoltaic power station inspected currently, light irradiance, temperature and output voltage and current of a photovoltaic module; splicing and fusing the infrared image and the visible light image of the photovoltaic power station, and extracting hot spot features to obtain the actual position of each hot spot; in combination with the light irradiance, the temperature and the output voltage and current of the photovoltaic module, judging the shadow category of each hot spot position in sequence, and further judging whether to send a hot spot position to a current to-be-cleaned position information data packet or not; and executing a corresponding operation and maintenance strategy according to whether the inspection is the first inspection.

The invention discloses a camera calibration and flat field correction device, a camera calibration method and a flat field correction method. The camera calibration and flat field correction device comprises a camera obscura; a light source generator which comprises an LED light source and an optical fiber connected with the LED light source; A reference camera; and a Mobile station. The camera calibration and flat field correction device adopts an LED light source with adjustable brightness as an emission light source; the reference camera is used as a detector of illumination light irradiance; the camera to be detected and the reference camera are mounted on a movable moving table; The device can adjust the irradiance of illumination light by adjusting the brightness of the LED light source or adjusting the distance between the camera to be detected and the reference camera and the LED light source. wherein the reference camera is an area array detector and can also be used for detecting the irradiation uniformity of illumination light, so that the device is composed of cheap components and can carry out rapid and accurate camera calibration and flat field correction.

The invention discloses an intelligent control device and method of an energy storage system for reducing the loss of a photovoltaic power station. The device comprises: a synchronous signal acquisition module configured to synchronously acquire output voltage signals of a photovoltaic power station, light irradiance and SOC monitoring quantities of a battery, and transmit the same to an energy storage intelligent centralized controller, wherein the energy storage intelligent centralized controller is connected to an energy storage system of the photovoltaic power station. The energy storage intelligent centralized controller is configured to: divide the whole day into three periods: peak period, valley period and peace period; determine a period of time at the current time, and predict aphotovoltaic power generation output power at the current time according to the output voltage signal and the current signal of the photovoltaic power station at the current time; determine a controlmode of an energy storage system for controlling a photovoltaic power station in each period. The energy storage system of the photovoltaic power station is controlled by the matching control mode inthe current period until the end of the day. By controlling the energy storage system of the photovoltaic power station every day, the operation loss of the photovoltaic power station is minimized andthe maximum profit is obtained.

The invention discloses an intelligent light control sun-shading system. The intelligent light control sun-shading system solves the problem that due to the fact that in daily life, a curtain can not be opened or closed in time, the indoor luminance is too high or too low. The intelligent light control sun-shading system can be automatically and manually controlled. A luminance sensor is arranged to collect luminance data, the data are transmitted to a central processing unit of an indoor control system with the help of a wireless transmission module, and whether the curtain opening and closing operation and other operation are conducted or not is analyzed according to set programs. By means of the system, under the no-man control condition, automatic opening and closing of the curtain can be controlled on the basis of the indoor light ray intensity, the good rest environment, the good reading environment, the good study environment, the good storage environment and other environments are created for indoor portions, and the more comfortable and user-friendly living experience is provided.

The invention discloses a photovoltaic power generation subsidy cheating prevention device based on a neural network algorithm. The photovoltaic power generation subsidy cheating prevention device comprises a photovoltaic board, wherein a plurality of light irradiancy sensors are uniformly arranged on the photovoltaic board, and are connected with a core processor through a wireless communication network, and the core processor comprises a photovoltaic power generation meter, and is connected with a human and machine interaction system. The photovoltaic power generation subsidy cheating prevention device has the beneficial effects that the structure is simple, and the implementation is easy; the cheating of the subsidy caused by the metering of photovoltaic power generation amount is prevented, the purpose of the national subsidy truly encouraging the application of the photovoltaic power generation system is guaranteed, and the influence on the implementation of national new energy encourage policies caused by loss of limited national subsidy fund is avoided.

The invention discloses a maximum solar energy cell power point method of foldable line fitting, the method comprises the steps of firstly building a math analysis model: (the equation being described in the application), then according to the above equation fitting the lines and calculating to obtain multiple pieces of the maximum power point reference line coefficients under different temperatures, finally respectively measuring the current IOUT, and voltage VOUT outputted by the target solar energy cell, substituting in equation (1) and carrying out calculations and high and low point adjustments till obtaining the maximum power tracing point of the target solar energy cell under different temperatures. The method proposes a relation curve among the many maximum power points under different sun lights using two straight lines to fit the known temperatures, in order to increase the fitting precision under low light irradiance extent condition, can be used to realize the high efficiency open loop control MPPT, and makes it easy to achieve and keeps at low lost.

The present invention discloses a chrysanthemum growth regulating energy-saving lamp, including: lamp tube, lamp holder and lamp head, the lamp tube is connected to the bottom of the lamp holder, the lamp head is connected to the top of the lamp holder whith which an electron ballast is installed, a tungsten filament connecting with the electron ballast is extruded into the lamp tube, the electron ballast is connected to the corresponding contact on the lamp head through conductor; said lamp tube duplex voluminous inverse fungus-shaped structure; the spectrum wavelength range of the energy-saving lamp locates between 400 nm to 700 nm, the peak value wavelength locates between 600 nm to 660 nm (equal to or nearby 660 nm is optimum), the second peak value wavelength is about 480 nm, and inhibiting the spectrum quantity of the wavelength of 730 nm. The illumination energy-saving lamp is characterized in that high brightness, long lifetime, low energy-losing and levity light source wavelength, and can meet the chrysanthemum growth illumination regualtion requirement.

The invention relates to an automatic glare-shielding control method for liquid crystal sunglasses and a control device thereof. The control method comprises the following steps: liquid crystal lens are arranged on the sunglasses, and conductive film electrodes and controllers are arranged on both sides of the liquid crystal lens; the output ends of the controllers are connected with a light angle sensor and an illuminance sensor, when illuminance is less than a set threshold value, the voltage output is controlled by the controllers with no dark band; when illuminance is larger than the set threshold value, dark band control voltage is output by the controllers according to the angle of a light source to the liquid crystal lens; according to the characteristics that when the voltage rises to a certain value, a dark band is seen above a lens and the dark band can move down with the increase of the voltage, dark bands seen by human eyes are moved to shield the position of the light source by the controllers which use the dark band control voltage, and the dark band control voltage is higher than the upper limit of the critical value of the control voltage in homogeneous transmittance sensitive control region of the lens. The invention can realize the function of automatic shielding dynamic glare in a certain direction on non-division lens and has the advantages of simple structure and small volume.

The invention provides an LED illumination device, comprising a plurality of LEDs, a spherical bearing surface and a condensing lens; a plurality of LEDs are fixedly arranged on the spherical bearing surface and point at the spherical center of the spherical bearing surface; the condensing lens is arranged before the LEDs; furthermore, a plurality of LEDs, the condensing lens and subsequent optical systems are sequentially connected by optical paths. The invention also provides an adjusting method used for illumination uniformity of the LED illumination device; optical energy emitted by all LEDs are changed by adjusting the input power of all LEDs, thus adjusting the uniformity of output illuminance of the illumination device further. The LED illumination device and the adjusting method have the advantages of high brightness and simple illuminance adjustment, can replace mercuric bulbs to be directly applied to illumination of projectors or other instruments, and have wide usage range.

The invention belongs to the technical field of an electronic product and particularly discloses a humidifier. The humidifier comprises a humidifier body and a power supply circuit in the humidifier body, wherein the humidifier body is provided with an illuminating lamp which is electrically connected with the power supply circuit in the humidifier body through an infrared sensor switch; the front surface of the humidifier body is further provided with an electronic meter and an electronic moisture meter, and a photosensitive switch is arranged in the infrared sensor switch and used for connecting and disconnecting the power supply circuit through illumination intensity. The humidifier is provided with the illuminating system of the infrared sensor switch, so that the problem that the lamp cannot be conveniently opened when people gets out of bed during the night and damage of indoor articles or personal injury is easily occurred when people operates in the night is solved, besides people can conveniently see the time and understand indoor humidity conditions through the electronic meter and the electronic moisture meter on the humidifier surface. Thus the humidifier has multiple purposes, the living expense of people is saved and the humidifier brings about convenience to the people's life.

The present invention discloses a non-destructive method and apparatus for measuring the 3D topography of a sample having periodic microstructure deposited onto the surface, or deposited onto a film, or buried into the film or sample. In particular, the present invention relates to an optical system and method utilizing polarized light beam, diffracted from the repeated structure, to measure its spatial geometry giving parameters such as profile height, profile widths, sidewall angles, and arbitrary profile shape. The optical system employs a broadband or semi-monochromatic light source to produce a light beam that is polarized and focused onto the periodic structure being measured. The focused beam consists of a whole range of illumination angles that is provided to the structure simultaneously. Transmitted or reflected diffracted light generated by the interaction of the light with the periodic structure is collected by an imaging detector system. The detector records the diffraction light irradiance resolved into illumination angles, diffraction orders and wavelength. The data is applied to determine the geometrical profile of the periodic structure using a reconstruction algorithm that is based on comparisons between measured diffraction data and modeled diffraction irradiance of a profile model using Maxwell's equations. The reconstruction of the profile is performed by iterative adjustments of a profile seed model until the modeled diffraction irradiance matches the measured data within a predefined convergence tolerance.

The invention provides a light source mechanism capable of moving along a spherical track, belongs to the field of mechanical structures, and particularly relates to a uniform-illumination parallel light source device capable of directly emitting light rays from various angles. The light source mechanism can move along the spherical track through a two-dimensional moving mechanism, uniform parallel light sources capable of directly emitting light rays from various angles can be formed by combining light sources, and spatial positions of the light sources can be accurately controlled and positioned. The light source mechanism comprises the two-dimensional moving mechanism and a light source assembly capable of emitting parallel light rays, wherein an inner frame and an outer frame in the two-dimensional moving mechanism rotate around respective axes; the outer frame simultaneously drives the inner frame to rotate; the light sources circularly move in the X-axis direction and the Y-axis direction respectively, so that a spherical motion track is formed; light rays emitted from the light sources directly face a sphere center within a range of the motion track all the time, the distances from the light rays to the sphere center are equal, and consistency of illumination is kept. The position of a spherical center point of the spherical track of the light sources is changed by changing the positions of the light sources on a light source mounting plate.

A light delivery device (10) having a light source (12) and a variable aperture unit (18) is temporarily connected by a light guide (24; 24, 26) to a radiometer (38) for detecting irradiance of the delivered light. The light delivery device has a memory (30) for storing irradiance levels. The light delivery device is calibrated by adjusting the aperture to each of a series of predetermined settings, obtaining from the radiometer a corresponding series of delivered light irradiance levels measured thereby, storing the irradiance levels and aperture settings in memory, and applying a best fit algorithm to the irradiance measurements and aperture settings. Thereafter, a desired irradiance level can be set by selecting the best fit aperture setting. Output intensity levels may be measured at the same time as the irradiance levels and used to compensate for light source degradation when setting a desired irradiance level.

The invention discloses a method and device for calibrating an ambient light sensor. The method comprises the steps of determining an illumination range according to the preset standard illumination,the standard transmittance and the transmittance tolerance; dividing the illumination range into a plurality of illuminance intervals, and setting corresponding weights for the illumination intervals;obtaining a predetermined number of illumination intensities measured by the ambient light sensor; determining the illumination interval where each illumination intensity is located, and determiningan illumination interval with the most accumulative illumination intensities; enabling the weight corresponding to the illumination interval with the most accumulative illumination intensities to serve as a calibration value, and calibrating the illumination intensity measured by the ambient light sensor according to the calibration value. According to the invention, calibration is performed on the ambient light sensor, that is, calibration is performed on the illumination intensity measured by the ambient light sensor, so that the accuracy of brightness adjustment of a display screen is improved. A problem that the transmittance tolerance is easy to introduce an error is considered in the process of determining the calibration value, so that the error introduced by the transmittance tolerance is avoided.