148 results about "Transmission curve" patented technology

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.

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.

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.

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.

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.