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64 results about "Absolute magnitude" patented technology

Absolute magnitude (M) is a measure of the luminosity of a celestial object, on an inverse logarithmic astronomical magnitude scale. An object's absolute magnitude is defined to be equal to the apparent magnitude that the object would have if it were viewed from a distance of exactly 10.0 parsecs (32.6 light-years), without extinction (or dimming) of its light due to absorption by interstellar matter and cosmic dust. By hypothetically placing all objects at a standard reference distance from the observer, their luminosities can be directly compared on a magnitude scale.

Method for braking a vessel with two marine propulsion devices

A method for controlling the movement of a marine vessel comprises steps that rotate two marine propulsion devices about their respective axes in order to increase the hydrodynamic resistance of the marine propulsion devices as they move through the water with the marine vessel. This increased resistance exerts a braking thrust on the marine vessel. Various techniques and procedures can be used to determine the absolute magnitudes of the angular magnitudes by which the marine propulsion devices are rotated.
Owner:BRUNSWICK CORPORATION

Multi-layer differential phase shift keying with bit-interleaved coded modulation and OFDM

An efficient system and method for modulation and demodulation to achieve a high data rate using Bit-Interleaved Coded Modulation and OFDM uses either a coherent or a non-coherent transmission scheme using differential modulation. In order to maintain a high data rate impervious to sudden phase changes, a communication system uses an efficient constellation having multiple rings with different sizes and modulation / demodulation schemes utilizing this constellation. In power line communications, the channel gain information is obtained easily at a receiver (100) while the phase information is not. Thus, the communication system uses an absolute magnitude and differential phase coding for modulation and demodulation of the signals.
Owner:UNIV OF FLORIDA RES FOUNDATION INC +1

System and method for determining angular position and controlling rotor orientation

Methods and devices for determining the position and / or angular orientation of a rotating shaft. Exemplary features include a sensor module and a position determination module. Sensor module may include a plurality of Hall Effect devices (HEDs) arranged at a specified angular separation to produce a signal in response to rotation of the shaft. Position module may be responsive to sensor module to produce a converted signal, determine an error term, and produce a position estimate. Converted signal may be produced by processing the HED signals into sinusoidal reference signals having offset scale and amplitude scale factors. Error term may be determined by processing the converted signals to produce an estimated position signal. Position estimate may be produced by processing the error term. Refined position measurement may be achieved by iterative elimination of regressive differences between position estimates with minimization of absolute magnitude of error term.
Owner:RAYTHEON CO

Method And Circuitry for Improving the Magnitude and Shape of the Output Current of Switching Power Converters

Apparatus of a grid-connected switching inverter for injecting it current into a power line comprises: (a) an electrical energy source for providing the substantially DC voltage to the apparatus; (b) a switching inverter connected to the electrical energy source for converting the substantially DC voltage of the electrical energy source to a high frequency alternating voltage; (c) a waveform generator for controlling the magnitude and shape of the alternating high frequency voltage outputted from the switching inverter by means of a control signal fed into the switching inverter; (d) an inductor connected to an output of the switching inverter for generating an alternating current from the alternating high frequency voltage, wherein the magnitude of the alternating current depends on a frequency of the alternating high frequency voltage: (e) a rectifier connected in series with the inductor for rectifying the alternating current and for outputting a rectified unipolar alternating current, wherein the rectified average value of the alternating current is proportional to the absolute magnitude of the power line voltage; and (t) a polarity commutator connected to an output of the rectifier for converting the rectified unipolar alternating current into a bipolar alternating current, and for injecting the bipolar alternating current into a power line, wherein the bipolar alternating current is substantially in phase with and of shape of the power line voltage of the power line.
Owner:BEN GURION UNIVERSITY OF THE NEGEV

Calibration method for CCD camera imaging application

InactiveCN101532948AIdeal non-uniformity calibration effectMeet the requirement of accuracy less than 0.5%PhotometryDiagnostic recording/measuringCcd cameraFunctional relation
The invention provides a calibration method for CCD camera imaging application, which comprises a calibration method for the pixel-response nonuniformity of a CCD camera, and a calibration method for reversely calculating the absolute intensity of a corresponding light source by utilizing the known absolute magnitude of an integrating sphere uniform light source and the pixel gray of an image captured by the corresponding CCD camera, wherein the calibration method for pixel-response nonuniformity automatically obtains a compensation matrix of a full-width image according to the gray information of each pixel on the image, and the calibration method for absolute intensity reversely calculates the quantitative information of the functional relation of the absolute intensity of the corresponding light source through the exposure time of the image and the gray of each pixel on the image. The calibration method for pixel-response nonuniformity and the calibration method for absolute intensity can follow the changes of the exposure time of the CCD camera and the pixel gray of the image to automatically calibrate pixel-response nonuniformity and the absolute intensity of the corresponding light source according to the calibration functional relation obtained in the calibration method.
Owner:XIDIAN UNIV

Spectrum self-correction photometer and measuring method thereof

The invention discloses a spectrum self-correction photometer and a measuring method thereof. The spectrum self-correction photometer comprises a light entrance, an optical spectroscope, a spectrometer and a silicon photovoltaic cell with a color filter, wherein light to be measured is divided into at least two beams by the optical spectroscope according to a set proportion; one part of beams is received by the spectrometer, the other part of beams is received by the silicon photovoltaic cell, and the light to be measured is simultaneously measured by the beams. The spectrum self-correction photometer of the invention can greatly reduce errors brought by the mismatch of the spectrum, has less reliance on the spectrum of the light to be measured, overcomes the problems brought by inconsistent special spectrum power distribution of a light source to be measured, time-varying luminescence, and the like, has relative smaller system measuring error and random error and high measuring repetitiveness and is calibrated by utilizing an absolute spectrum radiometer as a standard source so that the absolute magnitude transmission chain of an optical radiation degree is very short. The spectrum self-correction photometer has higher precision and reliable absolute magnitude value and can be applied to various optical radiation measuring systems for measuring a plurality of important optical radiation parameters.
Owner:HANGZHOU EVERFINE PHOTO E INFO

Polarization control for multichannel and polarization multiplexed optical transport networks

A system and method are provided for calibrating orthogonal polarity in a multichannel optical transport network (OTN) receiver. The method accepts a composite signal and separates the polarization of the signal into a pair of 2n-phase shift keying (2n-PSK) modulated input signals via Ix and Qx optical signal paths, where n≧1. Likewise, a pair of 2p-PSK modulated input signals are accepted via Iy and Qy optical signal paths where p≧1. Polarization-adjusted I′x, Q′x, I′y, and Q′y signals are generated. An average magnitude is compared to either 2×the absolute magnitude of (I′x and Q′x), or 2×the absolute magnitude of (I′y and Q′y). The average magnitude value can be used that is either 2×(a predetermined peak signal amplitude), or the sum of the absolute magnitudes of (I′x and Q′x) and (I′y and Q′y). The polarization-adjusted I′x, Q′x, I′y, and Q′y signals are modified until the magnitude comparison is about zero.
Owner:MACOM CONNECTIVITY SOLUTIONS LLC

Apparatus and method of AC driving OLED

An apparatus and method for providing switched power to an AMOLED is disclosed. During certain time intervals, voltage and / or polarity provided to active devices such as thin film transistors (TFT) driving the AMOLEDs may be changed to reverse polarity or differ in absolute magnitude of voltage. During a subsequent time interval, the changed power may be changed again and / or reverted to an original state. It is emphasized that this abstract is provided to comply with the rules requiring an abstract which will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims.
Owner:AU OPTRONICS CORP

Rectangular-wave transmitting metal detector

This invention relates to an electronic metal detector having transmit electronics comprising switching electronics arranged and adapted to generate a transmit signal, the transmit electronics comprising at least two power sources, a first power source and a second power source, the transmit electronics being connected to a transmit coil arranged and adapted to transmit an alternating magnetic field, wherein the switching electronics are adapted and arranged to switch a first voltage of the first power source to the transmit coil for at least a first period and also a third period, the switching electronics being adapted and arranged to switch a second voltage of the second power source to the transmit coil for at least a second period. The switching electronics are further adapted and arranged to switch approximately zero volts to the transmit coil for at least a fourth period, the second voltage being opposite in polarity to the first voltage, and an absolute magnitude of the first voltage being at least ten times an absolute magnitude of the second voltage, the said first voltage, second voltage, first period, second period and third period and fourth period being selected so that a transmit coil current increases in a second polarity sense during the second period and changes sign during the second period, and the transmit coil current increases in an opposite polarity sense to the second polarity sense during the first period and also the third period, receive electronics is adapted and arranged to receive and process a receive magnetic field during at least some of the second period and fourth period to produce an indicator output, the indicator output at least indicating the presence of at least some metal targets under the influence of the said alternating magnetic field and indicating at least a characteristic of the metal targets.
Owner:MINELAB ELECTRONICS

Online testing device and method for residual strength modulation of Y-waveguide modulator

InactiveCN105953818ASolve the problem of low precision and low measurement speedFast measurementSagnac effect gyrometersResidual strengthFrequency spectrum
The invention discloses an online testing device and method for residual strength modulation of a Y-waveguide modulator. The online testing device comprises a detecting optical path module, a detecting circuit module and a host computer. The working principle of the device is that a light source sends an optical signal to the Y-waveguide modulator, one end of an output branch of the Y-waveguide modulator is connected to a detector, and the optical signal is subjected to photovoltaic conversion through the detector, then passes through the level elevation circuit, a filter circuit and a high-speed A/D conversion chip, is processed by an FPGA (field-programmable gate array) and is finally sent to the host computer through an RS232 serial port for display. With design of the online testing device for residual strength modulation of the Y-waveguide modulator, the absolute magnitude of residual strength modulation can be obtained directly and rapidly, the problems of low precision and low testing speed are solved, one objective real-time online method is provided, and compared with the conventional methods adopting an oscilloscope, a lock-in amplifier, spectral analysis and the like, the testing precision is higher, the speed is higher and the functions are more complete.
Owner:BEIHANG UNIV
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