1128 results about "Calibration function" patented technology

A fractional concentration of clinically-relevant DNA in a mixture of DNA from a biological sample is determined based on amounts of DNA fragments at multiple sizes. For example, the fractional concentration of fetal DNA in maternal plasma or tumor DNA in a patient's plasma can be determined. The size of DNA fragments in a sample is shown to be correlated with a proportion of fetal DNA and a proportion of tumor DNA, respectively. Calibration data points (e.g., as a calibration function) indicate a correspondence between values of a size parameter and the fractional concentration of the clinically-relevant DNA. For a given sample, a first value of a size parameter can be determined from the sizes of DNA fragments in a sample. A comparison of the first value to the calibration data points can provide the estimate of the fractional concentration of the clinically-relevant DNA.

A robot system includes a fixed camera that obtains first measurement data by detecting a plurality of features positioned within a detection range, the detection range including at least part of a range in which a robot arm is movable, a hand camera movable with the robot arm, and a control apparatus that controls the robot arm. A calibration function that relates a value obtained as part of the first measurement data to a command value provided to the robot arm at each of a plurality of positions and orientations at which the hand camera obtains second measurement data by detecting each mark.

The present invention discloses a method for inspecting an object using multi-energy radiations and an apparatus thereof. The method comprises the steps of: causing multi-energy radiations to interact with an object under inspection; detecting and recording detection values after an interaction between the multi-energy radiations and the object under inspection; substituting a portion of the detection values into a predetermined calibration function to obtain information comprising primary material attribute; and determining further material attributes of the object by applying a set of functions suitable for a energy band corresponding to the information. The present invention is applicable to the large container cargo inspection without opening containers at customs, ports and airports.

A method for re-calibrating an anemometer of a wind turbine is provided, the method comprising the steps of obtaining pairs of measured values of wind speed and a wind-speed dependent turbine variable; comparing said measured value pairs to pairs of wind speed and the turbine variable obtained from an expected turbine variable curve of the wind turbine to determine a difference between a measured wind speed value and an expected wind speed value for a given turbine variable value; and adjusting a calibration function of said anemometer on the basis of said determined difference.

A calibrating apparatus for an image processing apparatus is disclosed. The calibrating apparatus comprises a first operating module and a second operating module. The first operating module determines a third indicating point and a fourth indicating point according to a first indicating point, a second indicating point, and a specific point, and determines a calibration point (i.e. the predetermined position of a sensor) according to a first line through the first indicating point and third indicating point and a second line through the second indicating point and fourth indicating point. The second operating module forms reference lines according to reference points and the calibration point, forms reference angles according to the reference lines and a parallel line, generates reference coordinates of the reference points in an image and generates a calibration function according to the reference coordinates of the reference points and the reference angles.

Physical parameters are measured for an array of seismic sources, preferably for each activation of the seismic sources. Calibration functions are obtained and the measured physical parameters and calibration functions are applied to a model, which generates a calibrated source signature for the array of seismic sources. Alternatively, the measured physical parameters are applied to a model, which generates a modeled source signature, and then the calibration functions are applied to the modeled source signature to generate the calibrated source signature. Alternatively, modeled source signatures are generated for each seismic source and then the calibration functions are applied to the modeled source signatures to generate a calibrated source signature for each seismic source. Then the calibrated source signatures for each seismic source are combined, preferably by linear superposition, to generate the calibrated source signature for the array of seismic sources.

An angle detector with self-calibration capability has a number of first scale read heads and one second scale read head around the periphery of a single scale disk and includes means for performing self-calibration by determining measurement differences between the second scale read head and the individual first scale read heads and calculating the average thereof.

The invention discloses a control device for a PTZ camera with an altitude self-calibration function. The control device comprises a rail, a rail platform, a rail motor, the PTZ camera, a PTZ motor, a first sensor, a second sensor and an embedded microcontroller, wherein the rail platform is arranged on the rail and can slide along the rail; the rail motor is connected with the rail platform and provides power for motion of the rail platform; the PTZ camera is installed on the rail platform and can move along with the rail platform; the PTZ motor is connected with the PTZ camera and provides power for pitching and deflection of the PTZ camera; the first sensor is arranged on the rail platform and can move along with the rail platform; the second sensor is arranged on the PTZ camera and can pitch and deflect along with the PTZ camera; the first sensor and the second sensor are connected with the signal input end of the embedded microcontroller respectively, and the rail motor and the PTZ motor are connected with the output end of the embedded microcontroller respectively. The invention further discloses a control method. According to the control device and method, travel distance errors and deflection and pitching angle errors caused by mechanical abrasion, thermal expansion and cold contraction and other factors can be compensated, and altitude self-calibration is achieved.

A current switch is automatically calibrated when a flow of electric current is initiated in a power cable.

Disclosed herein is a semiconductor device that includes a first transistor unit coupled to the data terminal, and a plurality of second transistor units coupled to the calibration terminal. The first transistor unit includes a plurality of first transistors having a first conductivity type connected in parallel to each other so that an impedance of the first transistor unit is adjustable. Each of the second transistor units includes a plurality of second transistors having the first conductivity type connected in parallel to each other so that an impedance of each of the second transistor units is adjustable. The semiconductor device further includes an impedance control circuit that reflects the impedance of each of the second transistor units to the first transistor unit.

The invention discloses a digital background calibration circuit used for a high-speed and high-precision pipelined analog-to-digital converter. The digital background calibration circuit comprises a pseudo random number generator, pipelined circuits with calibration functions and a digital background calibration engine. Based on the structure of the traditional pipelined analog-to-digital converter, a primary-stage pipelined circuit and a secondary-stage pipelined circuit are modified in the circuit disclosed in the invention to realize the injection of random signals and the digital background calibration engine is used to associate the random signals so as to realize the real-time extraction and compensation of error information, thereby avoiding the influence of irrational factors of the traditional pipelined analog-to-digital converter (such as capacitor mismatching, limitations of operational amplifier gains and the like) on the conversion precision of the analog-to-digital converter. The technology can lower the design difficulty of an analog circuit and ensure the performance of a system. At the same time, because of the simple algorithm and the low implementation complexity, the calibration circuit can be used to effectively reduce the area of the chip and lower the power consumption of the system, thereby being especially applicable to a high-speed system.

The invention discloses a radio frequency signal generating and radio frequency power detecting device. The invention comprises a radio frequency signal generating unit, which is used to generate the radio frequency signal with required frequency and power; a radio frequency signal power detecting unit, which is used to receive the radio frequency signal generated by the radio frequency signal generating unit or the radio frequency signal from the external, and to perform power detection; a radio frequency signal channel switching control unit, which is used to control the make-and-break of the input / output interface and the switching of the radio frequency signal generating unit and the radio frequency signal power detecting unit; a control unit, which is used to receive command through the interface unit, to control the radio frequency signal generating unit and the radio frequency signal power detecting unit; and an input / output interface, which is used for the input / output of the radio frequency signal. Through the adoption of the invention, the high accuracy power detection with low cost and high flexibility can be realized, and simultaneously the self calibration function can be realized, to acquire the output of the radio frequency signal with high accuracy.

The present invention relates to a method and apparatus for determining the wettability of a porous media, such as bone, plant, food, wood or molecular sieves, etc., having two or more fluids. The method of the present invention correlates a diffusion-relaxation calibration function representative of at least one fluid in the porous media with a 2-D function developed using diffusion-editing to determine wettability of the porous media.

A method for calibrating a multiple-triad triaxial accelerometer is provided. The method may include receiving accelerometer measured output from a first measurement triad and at least one additional measurement triad of the accelerometer. The method may further include aligning the output of a x, y, and z components of the first measurement triad to be substantially orthogonal with respect to each other, aligning the output of x, y, and z components of at least one additional measurement triad to be substantially orthogonal with respect to each other, and rotating the output of at least one measurement triad so the outputs of all measurement triads substantially align with each other. The method may further include storing the result of the alignment and rotation associated with at least one calibration function associated with the multiple-triad triaxial accelerometer. The alignment and rotation may be performed substantially simultaneously.

Analyte monitors and their methods of use. The analyte monitors include multiple calibration fluids which may have different known concentrations of an analyte, such as glucose. The analyte monitors may also include sensing or washing fluids. The analyte monitors are configured to be calibrated with the multiple calibration fluids to potentially provide a more accurate determination of analyte concentrations. The analyte monitors can be adapted to be self-calibrating with the multiple calibration fluids.

Weigh-in-motion (WIM) systems for weighing moving vehicles, the systems having the ability to automatically determine and periodically apply calibration factors to WIM scale readings. Auto-calibration may include transferring both WIM and static weight readings for the same vehicle to a database, associating the weight readings, collecting a number of such weight readings, and analyzing the differences between the WIM and static weight readings to calculate WIM scale calibration factors. The calibration factors may be based on vehicle characteristics such as vehicle weight, vehicle class and/or vehicle speed at the WIM scale.

The input light settings in many vision systems often do not correspond to fixed output light intensities. The relationships between the measured output light intensity and the input light intensity are inconsistent between vision systems or within a single vision system over time. This inconsistency makes it difficult to interchange part-programs even between visions systems of one model of vision systems, because a part program with one set of light intensity values might produce images of varying brightness on another vision system. However, many measurements depend on the brightness of the image. To solve this problem, a reference lighting curve is generated for a reference vision system, relating an input light intensity value to a resulting output light intensity. A corresponding specific lighting curve is generated for a specific vision system that corresponds to the reference vision system. A calibration function is determined that converts a reference input light intensity value into a specific input light intensity value. Accordingly, when an input light intensity value is input, the specific vision system is driven at a corresponding specific input light intensity value such that the output light intensity of the specific vision system is essentially the same as the output light intensity of the reference vision system when the reference vision system is driven at the input light intensity value. Thus, in a vision system calibrated using these lighting calibration systems and methods, the specific lighting behavior of that vision system is modified to follow a pre-defined, or reference, lighting behavior.

An apparatus and method for enabling an automatic calibration sequence for a light control system having a daylight harvesting scheme is disclosed herein. An ambient light sensor connects to a detection circuit for detecting the amount of ambient light within a given zone. A microprocessor connects between the detection circuit and a dimming circuit for providing control to initiate dimming and to start the auto-calibration sequence. Responsive to the amount of ambient light detected, the dimming circuit controls the power supplied to a plurality of electrical loads. A storage unit connects to the microprocessor for storing minimum light levels assessed during the auto-calibration sequence wherein the ambient light levels are monitored for a predetermined amount of time to determine the lowest level of ambient light generated for the purpose of setting and storing a target voltage level associated with such.

A microelectromechanical gyroscope having a supporting structure; a mass capacitively coupled to the supporting structure and movable with a first degree of freedom and a second degree of freedom, in response to rotations of the supporting structure about an axis; driving components, for keeping the mass in oscillation according to the first degree of freedom; a read interface for detecting transduction signals indicating the capacitive coupling between the mass and the supporting structure; and capacitive compensation modules for modifying the capacitive coupling between the mass and the supporting structure. Calibration components detect systematic errors from the transduction signals and modify the capacitive compensation modules as a function of the transduction signals so as to attenuate the systematic errors.