628results about How to "Improve sensing accuracy" patented technology

A rotary sensor that outputs two analog signals, such as one sine wave and one cosine wave and has multiple periods within one period of the electrical angle of a motor is employed. The motor is energized at each position for a specified length of time upon its startup by using multiple electrical angles corresponding to the multiple candidate absolute angles obtained from the rotary sensor signal as the initial position of the motor, and the electrical angle at which the motor acceleration becomes maximum is determined as the absolute angle. While the motor drive is in operation, on the other hand, the phase difference Δθ between the phase of the motor at the counter electromotive voltage and the control phase is directly computed from the parameters of the motor, sensed current, voltage command and angle speed so as to correct the shifted position. A high-efficiency motor drive unit with improved maintainability of rotary sensor and improved accuracy of sensing the magnet pole position of a permanent magnet synchronous motor that accelerates and decelerates very quickly in a wide range of speed is realized.

A MEM inertial sensor (e.g. accelerometer, gyroscope) having integral rotational means for providing static and dynamic bias compensation is disclosed. A bias compensated MEM inertial sensor is described comprising a MEM inertial sense element disposed on a rotatable MEM stage. A MEM actuator for drives the rotation of the stage between at least two predetermined rotational positions. Measuring and comparing the output of the MEM inertial sensor in the at least two rotational positions allows, for both static and dynamic bias compensation in inertial calculations based on the sensor's output. An inertial measurement unit (IMU) comprising a plurality of independently rotatable MEM inertial sensors and methods for making bias compensated inertial measurements are disclosed.

A liquid crystal display is disclosed. The liquid crystal display includes a liquid crystal display panel including a pixel array and touch sensors, a transparent conductive layer on one substrate of the liquid crystal display panel transmitting display light, a polarizing plate on the transparent conductive layer, a driving voltage supply circuit, and a signal transmitting unit electrically connecting the transparent conductive layer to the driving voltage supply circuit. A portion of the transparent conductive layer is connected to a ground level voltage source. The driving voltage supply circuit generates a driving voltage required to perform light sensing operations of the touch sensors during a touch period based on changes in an amount of surface charge of the transparent conductive layer depending on whether or not the polarizing plate is touched.

An organic light emitting display is provided which offers shorter sensing time and higher sensing accuracy when sensing variations in electrical characteristics of a driving element. The organic light emitting display can include: a display panel with a plurality of pixels; a gate driving circuit that generates a sensing gate pulse corresponding to one line sensing ON time in a sensing operation and sequentially supplies the same to gate lines in a line sequential manner; a data driving circuit comprising a plurality of current integrators that perform an integration of the source-drain current of the driving TFT of each pixel input through the sensing lines and an ADC that sequentially digitizes the output of the current integrators to output digital sensed values; and a timing controller that controls the operations of the gate driving circuit and data driving circuit.

An automated transaction machine includes apparatus for distinguishing between single sheets and multiple sheets in a sheet path. The apparatus includes radiation emitters (14, 34) and radiation detectors (20, 40, 42). The radiation emitters are operated to emit radiation at periodic intervals. Signal conditioners (50) receive signals from the radiation detectors and generate outputs responsive to the intensities sensed by the detectors substantially only during the periodic intervals. The outputs are combined, weighed and/or compared to thresholds to distinguish single and multiple sheets. The apparatus enables reliable operation in noisy electrical environments and with a wide variety of sheet properties.

A method of sensing the air/fuel ratio in a combustion chamber of an internal combustion engine that may be easily implemented by a respective low-cost device includes a pressure sensor and a learning machine that generates a sensing signal representing the air/fuel ratio by processing the waveform of the pressure in at least one cylinder of the engine. In practice, the learning machine extracts characteristic parameters of the waveform of the pressure and as a function of a certain number of them generates the sensing signal.

The invention discloses a capacitive sensing system, electronic equipment and a detection method of the capacitive sensing system. The capacitive sensing system comprises a sensor board and a capacitance detection circuit, wherein the sensor board is coupled with a target object in a capacitance manner to execute sensing operation; the capacitance detection circuit comprises a signal transmission end and an earthing end, and is used for providing a first excitation signal for the sensor board via the signal transmission end to drive the sensor board to execute sensing operation; the earthing end of the capacitance detection circuit is used for loading a first modulation signal; and the first excitation signal varies with the first modulation signal. With the adoption of the technical scheme, the sensing accuracy of the electronic equipment is improved.

A system and method are provided for providing precise location sensing for wireless devices in an indoor environment using channel fading fingerprinting. An indoor environment within which wireless devices are used is surveyed to develop a channel fading database for the indoor environment. The surveying of the indoor environment determines a specific channel fading profile according to 30 subcarrier frequencies in a wireless signal for numerous locations within the indoor environment. A wireless device scans for available wireless access points and extracts a channel fading profile for a current location of the wireless device. The extracted channel fading profile for the current location of the wireless device is compared with the channel fading database. A best match comparison between the extracted channel fading profile and the channel fading database is used to determine an actual physical location of the wireless device in the indoor environment.

Disclosed is an optical sensing device including a source unit providing a beam of light with continuously modulated phase retardation between p- and s-polarization components of the light by employing a LCM; a reference unit receiving a first part of the light to provide a reference signal; a SPR sensing unit receiving a second part of the light to induce a phase retardation change between the p- and s-polarization components due to SPR associated with a sample; a probe unit receiving the light after SPR to provide a probe signal; and a detection unit connected to the reference unit and the probe unit to detect characteristics of the sample by comparing the reference signal with the probe signal. By using active phase modulation technologies and differential phase measurement, it is possible to fulfill chemical and biological detection.

The present invention relates to a touch panel with a discharging function, which comprises a scanning bus, a sensing bus, a control unit, and a discharging circuit. The scanning bus is used for scanning a touch frame. The sensing bus interleaves with the scanning bus, and senses at least a touched location on the touch frame. The control unit is coupled to the scanning bus and the sensing bus 20′ for controlling them. The discharging circuit is coupled to the sensing bus or/and the scanning bus, and is controlled by the control unit for releasing the charges at the touched location or/and on the relevant path between the touched location and the buses. Thereby, by using a discharging circuit for releasing charges on the parasitic capacitor, the parasitic capacitance effect is avoided. Hence, the sensing accuracy of the touch panel is increased.

The invention provides a micro-droplet sensing device and a method using the same to measure refractivity. A single mode fiber forms a taper area through tapering, two ends of the single mode fiber are connected with a wide-spectrum light source and a spectrograph respectively, the taper area is placed in environment liquid, and annular core fiber optical tweezers control a micro-droplet to be close to the taper area; light emitted by the wide-spectrum light source is transmitted in the single mode fiber, is coupled into the micro-droplet by means of an evanescent field when going through the taper area and generates resonance in the mode of an echo wall, transmission light intensity at a resonance wavelength is reduced sharply to form a resonance valley, and the spectrograph is used to collect transmission light for spectrum analysis. The annular core fiber optical tweezers are utilized to control the micro-droplet to enable the same to form a perfect ball cavity, so that the problem that a solid ball echo wall sensor cannot form echo wall resonance due to unsmooth and defective surface of a solid ball is solved, and the micro-droplet is more sensitive to environment changing. The micro-droplet sensing device has wide application in the aspect of environment monitoring.

The invention discloses an optical fiber sensing method, an optical fiber sensing device and a using method of the optical fiber sensing device. In the optical fiber sensing method disclosed by the invention, a transmission function curve of an optical fiber grating is obtained by adopting a method for ensuring an optical single side band sweep frequency signal modulated by a microwave sweep frequency signal to pass through the optical fiber grating. The optical fiber sensing device disclosed by the invention comprises a microwave sweep frequency source, a narrow linewidth laser, a broadband single side band modulator, a narrow-band optical fiber grating sensor, an optical detector, a microwave amplitude-phase information extraction module, a data processing control module and a display module. The invention also discloses the using method of the optical fiber sensing device. Compared with the prior art, the optical fiber sensing method and the optical fiber sensing device have high sensing accuracy and large measurement range and the distributed sensing can be implemented by adopting a mode that a plurality of narrow-band optical fiber gratings with different stop-band center wavelengths are cascaded.