149 results about "Transmission curve" patented technology

The present invention relates to the production of instantaneous or non-instantaneous multi-band images, to be transformed into multi- or hyperspectral images, comprising light collecting means (11), an image sensor (12) with at least one two dimensional sensor array (121), and an instantaneous colour separating means (123), positioned before the image sensor array (121) in the optical path (OP) of the arrangement (1), and first uniform spectral filters (13) in the optical path (OP), with the purpose of restricting imaging to certain parts of the electromagnetic spectrum. The present invention specifically teaches that a filter unit (FU) comprising colour or spectral filter mosaics and / or uniform colour or spectral filters mounted on filter wheels (114) or displayed by transmissive displays (115), is either permanently or interchangeably positioned before the colour separating means (123) in the optical path (OP) in, or close to, converged light (B). Each colour or spectral filter mosaic consists of a multitude of homogeneous filtering regions. The transmission curves (TC) of the filtering regions of a colour or spectral filter mosaic can be partly overlapping, in addition to overlap between these transmission curves and those belonging to the filtering regions of the colour separating means (123). The transmission curves (TC) of the colour or spectral filter mosaics and the colour separating means (123) are suitably spread out in the intervals of a spectrum to be studied. The combination of the colour separating means (123) and the spectral or colour or spectral filter mosaics produces different sets of linearly independent transmission curves (TC). The multiple-filter image captured by the image sensor (12) is demosaicked by identifying and segmenting the image regions that are affected by the regions of the multiple filter mosaic, and after an optional interpolation step, a multi-band image is obtained. The resulting multi-band image is transformed into a multi- or hyperspectral image.

A phase-lock loop (PLL) has an oscillator comprising a plurality of operating curves. A method for implementing a multi-transfer curve in a phase lock loop. By means of a finite state machine cooperating with a current cell, the unwanted loop gain is effectively reduced to produce a wide-ranging operating curve.

The present invention relates to the production of instantaneous multispectral or hyperspectral images, comprising light collecting means (11), an image sensor (12) with at least one two dimensional sensor array (121), an instantaneous colour separating means, positioned before said image sensor (12) in the optical path of said arrangement (1), and first uniform spectral filters (112) in said optical path, with the purpose of restricting imaging to certain parts of the electromagnetic spectrum. The present invention specifically teaches that at least one first colour mosaic filter (112) is interchangeably positioned before the colour separating means (122) in, or at least close to, converged light (B). The first colour mosaic filter (112) consists of a multitude of homogeneous filtering regions with transmission curves that are partly overlapping on the first colour mosaic (112) or between the first colour mosaic (112) and the colour separating means (122) and suitably spread out in the intervals of a spectrum to be studied. The combination of the colour separating means (122) and the first colour mosaic filter (112) produces different sets of linearly independent colour filter transmission curves.

Systems and methods provide laser pulse energy control and / or monitoring. An example laser processing apparatus includes a laser system to generate a beam of laser pulses and a pulse energy control system to adjust the pulse energy of each laser pulse in the beam on a pulse-by-pulse basis. The pulse energy control system includes an open loop feedforward control path that selects a pulse energy transmission value for each laser pulse based on a calibrated transmission curve that maps laser pulse energy as a function of pulse repetition frequency. A laser energy monitor measures the laser pulse energy of each laser pulse in the beam of laser pulses. A power control loop may further adjust the pulse energy of one or more laser pulses in the beam of laser pulses based on feedback from the laser energy monitor.

Various embodiments of computer eyewear include optical treatments to provide a relaxing, calming, and soothing light environment for the eye. Certain embodiments of computer eyewear include a frame and two lenses. Each lens in these embodiments has optical power in the range from about +0.1 to about +0.5 diopters, and provides spectral filtering characterized by a transmission curve. The transmission curve includes a stop band portion positioned between about 320 nm to about 400 nm, a first plateau region positioned between about 420 nm to about 450 nm, a ramp region positioned between about 470 nm to about 560 nm, and a second plateau region positioned between about 570 nm to about 680 nm.

A variable reflectivity notch filter (100), suitable for use with a laser image projection source (1001) is provided. The variable reflectivity notch filter (100) defines a transmission curve (101) having a plurality of reflective peaks (102,103,104) each centered about a predetermined wavelength (105,106,107), which can correspond to output wavelengths from laser sources. Reflective peaks (204) corresponding to wavelengths that change with temperature are configured with wider widths (223) and lesser reflectivities (210) than are other reflective peaks (202,203). To provide enhanced color balance, lasers (821) corresponding to these reflective peaks (204) can be driven at higher output power. Variable reflectivity notch filters (100) are suitable for use in head-up displays as well as other applications.

A method predicting coverage area of a radiocommunications network including plural network cells distributed over a geographic area. The method includes calculating by simulation an irradiated electromagnetic field irradiated by a radio base station of the network in plural measure locations within the geographic area corresponding to respective expected positions of a user terminal. The calculating includes, for each measure location, calculating a basic transmission curve indicative of a basic attenuation of a radioelectric signal strength in the measure location, and associating to the basic transmission curve at least one correction factor for refining the radioelectric signal strength basic attenuation by taking account of shielding effects on the radioelectric signal strength due to obstacles to the propagation of the radioelectric signal.

The invention discloses a transflective dual-edge doppler wind lidar based on a single-cavity F-P interferometer and a single detector. The doppler wind lidar comprises a single-cavity F-P interferometer as a frequency detector, wherein the transmission curve and the reflection curve of the single-cavity F-P interferometer form two edges. The intersection point of the transmission curve and the reflection curve of the single-cavity F-P interferometer locks the laser output frequency, so that the dual-edge wind speed detection technique is realized. The transflective dual-edge doppler wind lidar is designed based on the time division multiplexing technique. Since a low-loss fiber delay line is additionally arranged in the reflection light path of the single-cavity F-P interferometer, the transflective signals of the single-cavity F-P interferometer can be acquired at the same time by a single detector. The dual-edge detection technique is realized based on the single-cavity F-P interferometer and the single detector, and the transflective dual-edge doppler wind lidar has the advantages of high utilization rate of laser radar signals, high precision of wind speed detection, low cost, stable system, relative safety for human eyes, all-fiber-optic link, compact structure and the like.

A method for solving feed-through effect, including steps of: obtaining desired gamma voltage value from a V-T curve (effective voltage-transmission curve) of the Liquid crystal and a gamma curve (gray scale-transmission curve); obtaining positive and negative frame feedback values by means of the desired gamma voltage value and the transistor reference data; adding the feedback values to obtain updating positive and negative frame gamma curve values; inputting the updating gamma curve values into the driving IC of the display; and through the feed-through effect, dropping the updating gamma curves back to the desired gamma curves, whereby the picture of the display will not flicker without adjusting Vcom DC bias.

Disclosed is a method for generating transfer curves for adaptive contrast enhancement. Given an input image, a luminance histogram is generated based on a set of predefined input luminance ranges. The luminance histogram is then expressed as a weighted sum of a set of predefined “primitive” histograms. Each primitive histogram has an associated reference transfer curve. A final transfer curve is produced as a corresponding weighted sum of the associated reference transfer curves. The image luminance can then be adjusted according the to the final transfer curve, resulting in enhanced image contrast. The disclosed method enables expansion of the number of available reference transfer curves without increasing the number of luminance ranges.

Disclosed is a device with precise channel spacing and multiple wavelength light source with high flatness and a method, belonging to the technical field of the optical communication, comprising an adjustable seed light source, a radio frequency signal source, a single arm mach tsend modulator, a double parallel mach tsend modulator, a power spliter, three electrical amplifiers and two electrical phase shifters. The method comprises: cascading the single arm mach tsend modulator and the double parallel mach tsend modulator, respectively driven by a low speed radio frequency signal, through selecting the bias points of the two modulators respectively as the highest point and the lowest point of the transmission curve, and simply control the amplitude and the phase of the radio frequency signal of the modulator, obtaining the wavelength light source including nine wavelengthes with the frequency interval equal to the frequency of the radio frequency signal. The wavelength light source of the invention has good spectral purity and phase coherence, high flatness, without expensive high power high frequency amplifier, thereby greatly reducing the arrangement cost.

The invention relates to the technical field of optical fiber communication external modulation and discloses a method and system for measuring a half-wave voltage of an electro-optical modulator. According to the invention, not only influence from joggling of a power of lights output by a laser to a transmission curve of the electro-optical modulator and the half-wave voltage measurement can be removed and the measured half-wave voltage value is enabled to be more accurate, but the fast measurement is also realized. According to the method and system for measuring the half-wave voltage of the electro-optical modulator, disclosed by the invention, DC (Direct Current) half-wave voltage of the electro-optical modulator not only can be measured, but the radio frequency half-wave voltage also can be measured.

The invention relates to a design method for a vibration isolation system in a central air conditioner room. The design method comprises the steps of establishing a power flow vibration isolation model according to major equipment in the central air conditioner room, drawing relation curves between structural parameters of the vibration isolation structure and transmitted power flow, vibrating speed and transmitted load, and determining the structural parameters of the vibration isolation system in the room; actually measuring data of vibration and noise in the central air conditioner room, establishing a vibration-sound coupling sound field finite element model, analyzing a mutual coupling relation between vibration and noise, and analyzing the effect degree of each piece of equipment in the central air conditioner room to the vibration-sound field; and under the condition of the mutual effect of the vibration-sound field, determining vibration isolation targets and a vibration isolation and noise reduction frequency band in the central air conditioner room by taking energy as an evaluation index, drawing the power flow transmission curve of the vibration isolation system and optimizing the structural parameters of a vibration isolator. Since the central air conditioner room is viewed as a large system, the influence relation between the vibration and the noise of each piece of equipment in the room is clear and the vibration of facilities is guaranteed to satisfy the standard; and since the energy is used as a vibration reduction index, the vibration isolation design is enabled to be more intuitive.

Various embodiments of computer eyewear include optical treatments to provide a relaxing, calming, and soothing light environment for the eye. Certain embodiments of computer eyewear include a frame and two lenses. Each lens in these embodiments has optical power in the range from about +0.1 to about +0.5 diopters, and provides spectral filtering characterized by a transmission curve. The transmission curve includes a stop band portion positioned between about 320 nm to about 400 nm, a first plateau region positioned between about 420 nm to about 450 nm, a ramp region positioned between about 470 nm to about 560 nm, and a second plateau region positioned between about 570 nm to about 680 nm.

β-quartz lithium aluminosilicate (LAS) glass-ceramics contain neither arsenic oxide nor antimony oxide, are fined with tin oxide and include vanadium oxide, chromium oxide and a high iron oxide content (>950 ppm), and have a controlled transmission curve. Articles such as cook-tops can be made from such glass-ceramics.

β-quartz lithium aluminosilicate (LAS) glass-ceramics contain neither arsenic oxide nor antimony oxide, are fined with tin oxide and include vanadium oxide, chromium oxide and a high iron oxide content (>1500 ppm), and have a controlled transmission curve. Articles such as cook-tops can be made from such glass-ceramics.

Disclosed are methods for producing optical filters on a substrate. In particular, methods for producing microengineered optical filters for the ultraviolet / visible / infrared portions of the electromagnetic spectrum are disclosed, as well as a computer-based system and method for precisely matching predefined target transmission spectra using various coating materials whose spectra can be combined and weighted for the matching. In addition, methods for producing printed optical filters comprising multiple coating components to produce composite optical filters whose transmission spectra match predefined target filter spectrum specifications are disclosed, where the thickness and fill factor of each component coating is tailored, based on the weighting of each component coating transmission spectrum.

The invention discloses an automatic calibration system for remote-measuring equipment, and belongs to the testing technology of the remote-measuring equipment. The automatic calibration system comprises a human-computer interaction interface, a calibration signal analog system, a matrix switch, the signal remote-measuring equipment, a data collection / reception unit, an instrument control unit, a data processing platform and a software control platform. The automatic calibration system estimates output signals through the data analyzing and processing method. The output signals and reference signals input by the calibration signal analog system are compared, fitting of a transmission curve is carried out, a system transfer function and transmission accuracy are calculated, and a data table is generated to record transmission data and a characteristic function of each channel. The automatic calibration system can test transmission factors of direct current signal channels and alternating current signal channels automatically according to the user requirements, and can be used for testing the transmission factors of the channels of the remote-measuring equipment of different types fast and accurately on the basis of a virtual instrument platform, obtain a transmission channel model of the equipment to be tested visually and clearly, and provide the basis for correction of the transmission channels of the remote-measuring equipment under different external environments.

The invention relates to multi-surface compound solar concentrator based on bionics principle. It belongs to solar condensation and solar heat utilizing technical field. The apparatus includes one-class compound parabolic concentrator-CPC; polarized light device or modified Fresnel lens; secondary-class CPC; third class CPC and likes. It is a solar energy utilizing device capable of utilizing varies reflection or transmission curve surface combination to realize solar light high-density gathering and transferring.

The invention discloses a method and device for configuring the boundary frequency band of an efficient filter rapidly. The method for configuring the boundary frequency band of the efficient filter rapidly comprises the steps that relevant pass band parameters of the filter and the translation parameters are obtained according to the pass band cut-off frequency of the filter and the order of the filter, and the filter coefficient with the length being 2N-1 existing before compensation is obtained according to the relevant pass band parameters of the filter and the translation parameters; a filter coefficient is obtained according to the filter coefficient existing before compensation, the Kaiser window parameter and a compensating filter coefficient analytic expression; the filter coefficient existing before compensation and a compensating filter coefficient are added, so that the final filter coefficient is obtained. The device for configuring the boundary frequency band of the efficient filter rapidly comprises an external RAM, a DSP, an output driver and a display circuit. According to the method and device for configuring the boundary frequency band of the efficient filter rapidly, parameters required for compensating the filter are calculated according to the filter coefficient existing before compensation and a transmission curve and are fed back to be stored in the external RAM, and all the parameters required for designing the filter are input into the DSP through the external RAM, so that the required filter coefficient and the transmission curve are obtained and are displayed through the output driver and the display circuit.

The invention provides a light supplementing lens, a light supplementing lamp and a camera. The light supplementing lens comprises an incidence curved face, a reflection curved face and an emergent smooth curved face. The incidence curved face comprises a free transmission curved face and an inner side wall, wherein the inner side wall is located on the periphery of the free transmittance curved face and is adjacent to the free transmission curved face. The reflection curved face comprises one or more free reflection curved faces, wherein each free reflection curved face corresponds to one section, in the circumferential direction, of the inner side wall. The light supplementing lens is configured that when a matched light source is located in a preset relative position and is used together with the light supplementing lens, a light supplementing area of a target rectangle is formed on a preset light supplementing plane. By means of the light supplementing lens, the light supplementinglamp and the camera, high optical efficiency and energy utilization efficiency are achieved, and light supplementing of a large angle range can be achieved.

The invention provides a method for calculating the linearity and conversion efficiency of all-optical sampling based on polynomial fitting. In the method, a least square fitting polynomial function of a sampling transmission curve is utilized to represent an all-optical sampling system, and sampling harmonic distortion and the conversion efficiency are calculated through the mathematical substitution of the polynomial function and a double angle formula of a trigonometric function so as to realize the representation of the linearity and conversion efficiency of the all-optimal sampling. The method has the characteristics of simple calculation process, accurate result and easy hardware realization, and also has the advantages of providing means for quickly and accurately representing and evaluating all-optical sampling performance indexes and having vast application prospect in all-optical signal processing and the sampling measurement and quality monitoring of optical network signals.

A fiber optical device, whose wavelength profile can be dynamically controlled in real time by the application of control voltages. The device can be used as a fiber optical gain equalizer or a wavelength selective filtering device which is compact, polarization insensitive, and of low manufacturing costs. The device comprises a stepped transparent substrate, through which the input beam is passed. Within the optical paths of the stepped regions of the substrate, electronically variable phase shifting elements are located, each operative to change the phase of the light passing through its associated step, and thus effectively adding tunability to the height of each step. Planar liquid crystal elements may be used as these elements. The elements may be pixelated, each pixel preferably affecting the phase of the light passing through a fraction of the area of the associated step, such that the interference so can be used to vary the transmission through that step. The pixels thus effectively add tunability to the area of each step. Electronic control of the height and area of each step enables the generation and dynamic control of complex transmission profiles.

The invention discloses a method for all-optically generating a high-speed millimeter wave in a radio over fiber system, and belongs to the technical field of optical communication. In the method, two standard Mach-Zehnder modulators are cascaded mutually and are respectively driven by low-speed radio frequency signals; and the high-speed millimeter wave with the repetition frequency which is six times that of the frequency of a radio frequency signal is obtained by selecting bias points of the two Mach-Zehnder modulators to respectively serve as a highest point and a lowest point of a transmission curve and simply controlling the amplitude and the phase of radio frequency drive signals of the two Mach-Zehnder modulators. In the device, a linear light frequency multiplication technology is adopted, so that the generated millimeter wave has very high spectrum purity and phase coherence. The technology does not need expensive high-speed photoelectric devices and a complex nonlinear signal processing technology, greatly reduces configuration cost, and simplifies a system structure. If high-speed devices are adopted, a frequency band over 100-GHz can be improved very easily without changing the structure of the system. Therefore, the method has a wide application prospect in future wireless broadband communication.

The invention provides an error extraction method for foreground digital calibration of an assembly line analog-to-digital converter, which comprises the following steps: acquiring a transmission curve of an assembly line analog-to-digital converter, and controlling an input signal to be within a subsection 0 of the transmission curve; when the error information of the i-th assembly line stage isextracted, setting the magnitude of the input signal to lock the output of all pre-stage comparators of the i-th assembly line stage in the assembly line analog-to-digital converter; according to theoriginal output code of the pipeline analog-to-digital converter, completing error extraction step by step in sequence from the rear stage to the front stage of the assembly line through self-adaptiveiteration. According to the method, when the error value is quantified, the capacitance mismatch error, the gain bandwidth error and the kickback error of each stage of the assembly line are extracted in the foreground through the fitting-based adaptive algorithm, an additional circuit is not needed, resources are saved, accurate quantification of the error value is realized, and digital calibration of the analog-to-digital converter of the assembly line can be conveniently realized.

The invention discloses a one-way damping hinge device, which comprises an upper connecting support, a lower connecting support and a hinge shaft, wherein the hinge shaft is fixedly connected with theupper connecting support; the hinge shaft is rotatably connected with the lower connecting support; a gear rack transmission mechanism, a damper mounting frame and a U-shaped transmission curved rodwhich is fixedly connected with an input rod of a damper are arranged on the lower connecting support; the gear rack transmission mechanism comprises a driving gear and a driven gear rack which are meshed with each other; the driving gear is fixedly connected with the hinge shaft; the driven gear rack is fixedly connected with the U-shaped transmission curved rod; and rollers are arranged betweenthe damper mounting frame and the U-shaped transmission curved rod. In addition, the invention also provides a method for controlling passive vibration of a structure by using the one-way damping hinge device. According to the one-way damping hinge device, the gear transmission principle is utilized, so that the capability of the building structure to resist vibration load can be effectively improved, the vibration control efficiency of the building structure is improved, and a new and effective method is provided for the vibration control of the structure in the field of civil engineering.