136results about How to "Avoid calibration" patented technology

A multi-tip extrusion method and apparatus for building a three-dimensional object deposits modeling materials from distinct supply sources, each in a layerwise predetermined pattern, from dispensers having co-planar dispensing tips. The tip spacing is controlled so that a road of material extruded by a leading one of the tips will cool and shrink from the plane of the tips before a trailing one of the tips passes over the road. In this manner, smearing of the road by a trailing one of the tips is avoided.

This invention relates to a method of performing eye gaze tracking of at least one eye of a user, by determining the position of the center of the eye, said method comprising the steps of:detecting the position of at least three reflections on said eye,transforming said positions to spanning a normalized coordinate system spanning a frame of reference, wherein said transformation is performed based on a bilinear transformation or a non linear transformation e.g. a möbius transformation or a homographic transformation,detecting the position of said center of the eye relative to the position of said reflections and transforming this position to said normalized coordinate system,tracking the eye gaze by tracking the movement of said eye in said normalized coordinate system.Thereby calibration of a camera, such as knowledge of the exact position and zoom level of the camera, is avoided. Further, it is not necessary to know the position of light sources. This results in a much more flexible and user friendly system.

In a method of calibrating a quadrature transmitter, a first calibration signal is injected into an in-phase transmit branch of the quadrature transmitter, and a second calibration signal is injected into a quadrature transmit branch of the quadrature transmitter. The first and second calibration signals are injected before performing up-conversion in the transmitter and are produced by first and second digital signals. A detector detects an up-converted signal. The detected up-converted signal is digitized. The in-phase and quadrature transmit branches are calibrated by alternately determining the first and second calibration signals while at least varying respective most significant bits of the first and second digital signals, upon said varying the at least most significant bits keeping calibration bit values that correspond to minimum values of the digitized detected up-converted signal.

A method and apparatus for monitoring and controlling the nano-scale flow rate of fluid in the operating flow path of a HPLC system. A first flow sensor is disposed in a first flow path between a first flow-divider and a fluidic tee. A second flow sensor is disposed in a second flow path between a second flow-divider and the fluidic tee. A first recycle flow restrictor is disposed in the first recycle flow path in fluid communication with the first flow-divider. A second recycle flow restrictor is disposed in the second The permeability of each recycle flow restrictor can be selected to produce a desired flow rate with each respective flow path. The output signals of the first and second flow sensors to control output of a pump within each flow path.

A device for continuously measuring a level of an ink in a tank (10) of a continuous ink-jet (CIJ) printer, including: a first pair of electrodes (24, 26) and part for connecting this pair of electrodes in series, for measuring the impedance of a first predetermined height of the ink, in the tank, a second pair of electrodes (16, 18) and part for connecting this second pair of electrodes in series, for measuring a second height of the ink in the tank, this second height being included between this first height and a maximum level; part for calculating the second height, from the resistive components of the 2 impedances measured, independently of the ink conductivity.

A method and apparatus for monitoring and controlling the nano-scale flow rate of fluid in the operating flow path of a HPLC system. A first flow sensor is disposed in a first flow path between a first flow-divider and a fluidic tee. A second flow sensor is disposed in a second flow path between a second flow-divider and the fluidic tee. A first recycle flow restrictor is disposed in the first recycle flow path in fluid communication with the first flow-divider. A second recycle flow restrictor is disposed in the second The permeability of each recycle flow restrictor can be selected to produce a desired flow rate with each respective flow path. The output signals of the first and second flow sensors to control output of a pump within each flow path.

The invention provides a visual servo control method of a multi-task surgical robot, and belongs to the technical field of surgical robots. The method comprises the steps of adopting the relative coordinate relation of the front end of the surgical robot and a surgery part as a control basis, extracting a control characteristic from an image acquired by image acquisition equipment, updating relative coordinate information in real time, according to the relative coordinate information, planning a surgery motion path, controlling the motion of a motion mechanism, achieving target surgery operation, and by replacing types of the control characteristic and the front end of the surgical robot, achieving a multi-task function. According to the visual servo control method of the multi-task surgical robot, the installation of additional markers and a calibration process are avoided, moreover, when a work mode based on visual servo is compared with a traditional work mode of the surgical robot,namely, 'planning before surgery and execution during surgery', higher surgery precision can be obtained.

The invention discloses a method for quickly measuring acid value of lubricating oil by thermometric titration, and belongs to a method for measuring acid value of lubricating oil. According to endothermic or exothermic effect in a chemical reaction, after an end point of a titration system is reached, excess titration solution is subjected to instantaneous endothermic or exothermic chemical reaction with temperature indicating liquid in a sample system so that the temperature of the titration system is remarkably reduced or raised so as to easily judge a titration end point. Particularly, the method comprises the following steps: weighing a lubricating oil sample, a solvent and the temperature indicating liquid, adding the three substances into a heat-insulated reaction container in a thermometric titration device, stirring the mixture to make the lubricating oil sample fully dissolved in the mixed solvent, keeping temperature constant, then using 0.1mol / L potassium hydroxide-isopropanol standard titrating solution to titrate the mixed solvent, using read numbers of a temperature sensor to draw a graph of the volume of the titrating solution, taking a jump point of a curve as a titration end point, and calculating the acid value of the lubricating oil sample. The method has the advantages of short detection time, accurate detection result, little error and low toxicity.

A baler comprises a baling chamber and a sensor arrangement. The sensor arrangement comprises at least one sensor arranged to provide information about a mechanical property of a bale built in the baling chamber and a control unit receiving signals from the sensor. The control unit is operable to automatically calibrate the signals from the sensor based upon at least one signal from the sensor received in at least one known state of the sensor.

A baler comprises a baling chamber and a sensor arrangement. The sensor arrangement comprises at least one sensor arranged to provide information about a mechanical property of a bale built in the baling chamber and a control unit receiving signals from the sensor. The control unit is operable to automatically calibrate the signals from the sensor based upon at least one signal from the sensor received in at least one known state of the sensor.

A system for assisting a driver of a biomechanically-driven vehicle having at least one wheel (R), such as a bicycle, includes a device (DET1) for determining the speed of the vehicle, another device (DET) for determining the heading of the vehicle, a magnetometer (M) with at least two measurement axes for supplying data to determine the heading of the vehicle, and a device for supplying information relating to a movement of the vehicle, based on the speed of the vehicle, the slope of the rolling surface, and the heading of the vehicle.

The invention provides distance measuring and speed measuring methods and devices based on video images. On the premise that a movement track of a measured object is perpendicular to a camera optical axis and the movement track of the measured object is a straight line, when the measured object moves from point A to point B in the movement track, distance between point A' and point B' is measured, wherein the point A' and point B' are corresponding points of the point A and the point B in an image plane. The distance between the point A and the point B is measured, according to the measured distance between the point A' and the point B' and a mapping proportionality coefficient of the distance in the movement track to the corresponding distance in the image plane. By adopting of the methods and the devices, real-time performance and accuracy of the measurement can be improved.

The invention discloses a laser mark automatic tracking extensometer control method based on uncalibrated visual servo. An image Jacobian matrix on-line identification method is adopted, the mapping relation between the actual distance between a laser mark and a sample mark, namely, the tracking displacement of the laser mark and image space tracking displacement is built, a controlled quantity is calculated by identifying the pixel distance difference between a Jacobian matrix and the central points of the two marks through a Karman filter, a servo motor is controlled to drive a pentaprism to rotate, the automatic tracking of the laser mark on the sample mark is achieved, and the laser mark displacement in the extending process is a sample deformation quantity. The method not only avoids the camera calibration step of an existing video extensometer and measuring errors introduced from the step, but also achieves the precise whole-process tracking of the laser mark on the sample mark, and is strong in environmental disturbance resistance capacity and high in tracking precision.

An imaging sensor system images in two different spectral bands a light beam traveling on a light path from a target. The sensor system includes an imaging sensor operable to image light of the two different spectral bands, a common optics having at least one reflective or refractive optical element, and a wavelength-selective beamsplitter on the light path between the target and the imaging sensor. The wavelength-selective beamsplitter splits the light beam into two subbeams, one subbeam for each of the two different spectral bands, that are respectively incident upon two different locations of the imaging sensor. The imaging sensor may be used to detect buried explosive mines.

The present disclosure provides a computer implemented method for automatic detection of teeth clenching and / or teeth grinding in a dataset representing the level of biting force vs. time of a subject, the method comprising the steps of a) calculating a threshold level of biting force assigned to time t=t1 based on a background level determined from the dataset at a prior time t=t1−Tback, where Ttrack is a first predefined period of time,b) checking the level of biting,and if the level of biting force at time,t, exceeds the threshold level assigned to time t for a second predefined period of time, Tclench / grind, then assigning an event of teeth clenching to time t,c) if an event of teeth clenching has been assigned to time t, then either waiting a predefined period of time 10 Twait,or waiting until the level of biting is below the threshold for another predefined period of time Tend, d) if no events of teeth clenching and / or teeth grinding have been assigned for a third predefined period of time Tsilence, then repeating steps a)-c),e)if events of teeth clenching and / or teeth grinding have been assigned for a third predefined period of time Tsilence, then repeating only steps b)-c).

The invention discloses a spectral data calibration method based on black and white calibration plates. The method comprises the following steps of: firstly, collecting spectral data of a black calibration board and a white calibration board respectively; then collecting spectral data of a to-be-detected sample and carrying out data modeling, and recording the spectral data as spectral data X andthe model as a spectral model M; calculating actual spectral data Y of the to-be-detected sample by combining the spectral data of the black calibration plate and the spectral data X of the sample; calculating the actual reflectivity H of the to-be-detected sample by combining the spectral data of the white calibration plate and the actual spectral data Y of the sample; and finally, carrying out data modeling on the reflectivity H by adopting a modeling method which is the same as that of the spectral model M, and judging the quality of the spectral model through a model correlation coefficient and a root-mean-square error. According to the method, the spectral data can be effectively calibrated, the spectral model quality and the spectral prediction accuracy are further improved, meanwhile, the method is easy to implement, and the problem that the portable near infrared spectral data is difficult to calibrate is solved to a great extent.

A surrounding area monitoring apparatus for vehicle includes an infrared camera mounted on a vehicle for capturing images of surrounding area around the vehicle, a unit for generating and displaying images based on image data captured by the camera, and a controller for calibrating output of the camera with respect to a relation between pixels, based on image data produced by imaging a surface of a shutter that opens and closes an aperture introducing a light to the camera. The controller estimates whether a temperature of the camera is stable, based on an operation state of the vehicle, and determines a possibility that a driver is looking at the unit, based on a behavior of the vehicle. When the temperature of the camera is estimated stable and the possibility that the driver is looking at the unit is determined to be low, the means for calibrating executes the calibration.

The invention discloses a transmission detection device for a radio frequency terminal and a control method thereof. The device comprises a radio frequency feedback receiver and a calibration controller. The output end of the radio frequency feedback receiver is connected with the calibration controller. The radio frequency feedback receiver comprises a test signal generator, a gating switch and apreprocessing circuit. The input end of the preprocessing circuit is selectively connected with the test signal generator or a detection point of a radio frequency terminal through the gating switch.The preprocessing circuit is used for preprocessing an input signal. The output end of the preprocessing circuit is taken as the output end of the feedback receiver. The calibration controller comprises a digital signal processor. The digital signal processor is used for controlling the gating switch of the feedback receiver and calibrating the radio frequency feedback receiver or the radio frequency terminal according to an output signal of the radio frequency feedback receiver. The accuracy of the device and the control method are relatively high.

The present invention discloses a calibration method and system for high-intensity field sensors. The objective of the invention is to solve the problem that a standard field method is less likely to generate high field strength in a test area. The system of the invention comprises a transmitting antenna, a field strength meter, a reverberation chamber, a receiving antenna and a signal receiving system; the reverberation chamber comprises a horizontal agitator and a vertical agitator; the signal receiving system is used for measuring the field strength value of the receiving antenna. The method of the invention includes the following steps that: a calibrated field sensor is arranged in the field uniform area of the reverberation chamber, the transmitting antenna radiates electromagnetic waves into the reverberation chamber; the number of the times of the stepping of the horizontal agitator and the vertical agitator in one agitating cycle is set; when stepping occurs each time, the receiving field value of the field sensor and the aperture receiving power of the receiving antenna are measured; the average receiving field strength value of the field sensor and the average receiving field strength value of the receiving antenna in one agitating cycle are obtained; and the average receiving field strength value of the field sensor is compared with the average receiving field strength value of the receiving antenna, so that the field strength correction factor of the field strength sensor can be obtained. With the method and system of the invention adopted, the calibration of field strength sensors of which the field strength amplitude is above 200V / m can be realized.

A method of providing an indication of pH levels in an animal can alternatively be used to provide an indication of stress in an animal. Since pH and temperature are related to ultimate meat quality, the method of the invention may also be used to provide an indication of ultimate meat quality. In the method, periodic measurements are obtained corresponding to the body temperature of the animal. An algorithm is applied to the measurements obtained. The algorithm cumulatively takes account of variations of body temperature over time. The results of the algorithm are compared to a per-determined threshold. Alternatively, the results of the algorithm may be compared with a standard to provide a quantitative indication of pH, stress or meat tenderness. A system for providing an indication of meat quality / stress levels or pH levels in an animal is also provided.

The invention provides an ambient air monitoring sensor remote calibration method. The sensor remote calibration method is characterized in that a server, an ambient air monitoring mobile terminal andan air quality standard monitoring station are adopted to carry out remote calibration on a sensor of an ambient air quality monitoring device. The invention also provides the ambient air quality monitoring device for ambient air monitoring. The ambient air quality monitoring device comprises a shell and an air quality monitoring system located in the shell, wherein the air quality monitoring system is internally provided with the sensor, and the ambient air quality monitoring device is applied to the sensor remote calibration method to carry out remote calibration on the sensor. The sensor remote calibration method can solve problems of complex sensor calibration process, low efficiency and high cost of the existing ambient air quality monitoring device; and the ambient air quality monitoring device has the advantages of convenient carrying, easy calibration, accurate detection result and low cost, and can carry out remote calibration on the sensor through the sensor remote calibration method, thereby reducing the calibration cost.

The invention discloses a comprehensive ramp stopping and sliding control system applicable to an electric forklift. The system comprises control steps as follows: when a speed detection unit detectsthat the speed of the vehicle is zero, a torque evaluation unit calculates the current torque; when the torque is larger than a set threshold, a ramp staying control unit is triggered, and the vehicleis stopped on a ramp by electric brake of a motor; when the electric brake time of the vehicle exceeds ramp stopping time, the system actively switches to a ramp sliding control unit; the torque evaluation unit calculates the current torque, when the torque is smaller than the preset threshold, the vehicle is regarded to be located on the flat ground, the system actively quits the ramp sliding state, the vehicle is stopped on the flat ground, the torque is smaller than the preset threshold, and the normal working mode returns. The system enters the ramp stopping program by brake instead of anexternal trigger signal. A motor controller stops the motor through closed-loop control to automatically adapt to different ramps. Therefore, formulation of different PI tables for different ramps can be avoided. Stability and safety in the ramp sliding process are realized by adding ramp sliding speed setting items and speed closed loop.

The present disclosure provides a computer implemented method for automatic detection of teeth clenching and / or teeth grinding in a dataset representing the level of biting force vs. time of a subject, the method comprising the steps of a) calculating a threshold level of biting force assigned to time t=t1 based on a background level determined from the dataset at a prior time t=t1-Tback, where Tback is a first predefined period of time,b) checking the level of biting,and if the level of biting force at time,t, exceeds the threshold level assigned to time t for a second predefined period of time, Tclench / grind, then assigning an event of teeth clenching to time t,c) if an event of teeth clenching has been assigned to time t, then either waiting a predefined period of time 10 T wait,or waiting until the level of biting is below the threshold for another predefined period of time Tend, d) if no events of teeth clenching and / or teeth grinding have been assigned for a third predefined period of time Tsilence, then repeating steps a)-c),e)if events of teeth clenching and / or teeth grinding have been assigned for a third predefined period of time Tsilence, then repeating only steps b)-c).

The image forming apparatus has an image supporting body, a developing device on which developing units storing developers of the same color are detachably mounted, and control unit for controlling a printing operation in response to a print request. Further, in the case where the total number of print pages of a first developing unit, which is in use, exceeds the number of calibration pages if executing a print request, when a second developing unit which does not exceed the number of calibration pages exists, the control unit executes the printing operation using the second developing unit, and when the second developing unit does not exist, the control unit executes the printing operation using the first developing unit if the requested print page number does not exceed a predetermined threshold, or executes a calibration operation if the requested print page number exceeds the predetermined threshold.

An imaging sensor system images in two different spectral bands a light beam traveling on a light path from a target. The sensor system includes an imaging sensor operable to image light of the two different spectral bands, a common optics having at least one reflective or refractive optical element, and a wavelength-selective beamsplitter on the light path between the target and the imaging sensor. The wavelength-selective beamsplitter splits the light beam into two subbeams, one subbeam for each of the two different spectral bands, that are respectively incident upon two different locations of the imaging sensor. The imaging sensor may be used to detect buried explosive mines.

An embodiment of the invention relates to a method for calibrating an optical path of a laser path. The method comprises the steps of forming a first image on an imaging device from a first light beam through a first lens, irradiating a to-be-measured object by a second light beam from a first light source through a reflector and a second lens, and forming a second image of the to-be-measured object on the imaging lens through the second lens and the first lens; and adjusting at least one in direction and pitch of the to-be-measured object until the first image is superposed with the second image at the imaging center of the imaging device.

The invention provides a step type multi-optical path cuvette and relates to a cuvette. The step type multi-optical path cuvette comprises a cuvette body, a step type cuvette table, a sliding baffle block, wherein the cuvette body is a step type cuvette, and a plurality of steps I are arranged on the step type cuvette; the step type cuvette table is arranged on one side of the step type cuvette, steps II matched with the steps I are arranged on the step type cuvette table, and the step type cuvette table is a light-proof body; and the sliding baffle block supports the other side of the step type cuvette. According to the step type multi-optical path cuvette, the optical path is regulated by increasing and decreasing the number of the steps of the step type cuvette, the requirements of multi-optical path measurements can be simultaneously met, the use is convenient, the entry of stray light can be avoided, and the addition of samples can be conveniently controlled; and samples with series of concentrations do not need to be prepared during rough measurement, operations such as semi-quantitative dilution can be directly carried out in the cuvette, so that the measurement conditions can be conveniently selected, and the sample amount can be further saved. The step type multi-optical path cuvette is particularly applicable to field measurement use of spectrographs.

According to the invention, a device and a method are provided for determining the position of an object, in particular a moving object, in the three-dimensional space. The device comprises at least two switchable transmitting antennas having a different vertical position of the phase center as well as a plurality of receiving antennas which are arranged in series. The transmitting antennas are arranged in the horizontal direction and at a distance that corresponds to the distance of the receiving antennas. The transmitting antennas are vertically offset with respect to each other by a value that is less than or equal to half the free-space wavelength of the transmitted signal. The transmitting antennas can otherwise be arranged at any position around the receiving antenna. Horizontal beam sweep across a wide angular range is carried out according to the method of “digital beamforming”. The measurement of the vertical object position is carried out by phase measurement between the antenna beams when the transmitting antennas are sequentially switched.

The invention relates to a height sensor calibration method, device and equipment, an electric control air suspension and a vehicle, and the method comprises the steps: entering a calibration mode ifa height sensor calibration identification is not obtained; in the calibration mode, in the process of calibrating and adjusting the height of the detected object, acquiring coil charging data of theheight sensor; determining a working mode to which the height sensor belongs according to a preset association relationship between the coil charging data and the working mode of the height sensor; and calibrating the height sensor according to the working mode so as to carry out actual adjustment on the height of the detected object according to the working mode. By the adoption of the technicalscheme, the tedious degree of the installation and calibration process of the height sensor can be reduced, and the installation and calibration efficiency of the height sensor is improved.

An image forming apparatus includes: a determination unit configured to determine an adjustment value for outputting a maximum density value determined in advance for a color used in forming an image by an image forming unit; an output unit configured to output a patch image by using an adjustment value determined by the determination unit; a creation unit configured to create a table for correcting a density value of an image formed by the image forming unit by using the results of measuring a patch image output by the output unit; and a control unit configured to control, before the creation unit creates a table, whether or not to cause the determination unit to determine the adjustment value again from the beginning in accordance with a difference between the density value of the patch image and the maximum density value by causing the output unit to output the patch image.