81results about How to "Reliable and accurate measurement" patented technology

A flow measuring apparatus (300, 500) measures a fluid flow (130) within a conduit (120) including a wall (110). The apparatus (300, 500) includes a transducer arrangement including at least two transducers (100A, 100B) for alternately emitting and receiving ultrasonic radiation through the conduit wall (110) and the flow (130). The apparatus (300, 500) also includes a signal processing arrangement (310) for generating signals to excite the transducer arrangement (100A, 100B) and for processing received signals provided by the transducer arrangement (100A, 100B) for generating output signals from the signal processing arrangement (310) indicative of properties of the flow. The transducer arrangement (100A, 100B) in cooperation with the conduit (120) provides a first path (200) for Lamb-wave ultrasonic radiation coupling directly from a first of the at least two transducers (100A, 100B), to a second of said at least two transducers to generate a first received signal. The transducer arrangement (100A, 100B) in cooperation with the conduit (120) provides at least one second path (210) for ultrasonic propagation along the wall (100) via Lamb waves coupling to at least a portion of the flow (130) from a first of the at least two transducers (100A, 100B) to a second of the at least two transducers (100A, 100B) to generate a second received signal. The signal processing arrangement (310) determines from said first and second received signals ultrasonic radiation propagation time periods through the first path (200) and through the at least one second path (210), and to perform computational operations on the propagation time periods to determine properties of the flow including, but not limited to, at least one of: fluid flow velocity (v) in the conduit (120), a sound velocity (c) through the fluid (130).

In a system and method of capturing movement of an object, a tracking device is used having an optical marker and a motion sensor providing motion data representative of the position and orientation of the tracking device. The tracking device is connected to the object, and motion of the optical marker is registered by a camera to thereby provide video data representative of the position of the tracking device. The motion data and the video data are processed in combination to determine the position and orientation of the tracking device in space over time.

A pulse oximeter system comprises a data processor configured to perform a method that combines a sigma point Kalman filter (SPKF) or sequential Monte Carlo (SMC) algorithm with Bayesian statistics and a mathematical model comprising a cardiovascular model and a plethysmography model to remove contaminating noise and artifacts from the pulse oximeter sensor output and measure blood oxygen saturation, heart rate, left-ventricular stroke volume, aortic pressure and systemic pressures.

A portable, handheld device for measuring lung- and airway-specific respiratory parameters. The device defines a chamber in fluid communication with a mouthpiece. A sensor and / or a flow sensor monitor pressure and / or airflow within the device. A respiratory gas source, e.g., an internal pump, or an external compressor, is also in fluid communication with the chamber and a mouthpiece. The device operates in an active phase and a passive phase. In the active phase, a subject forcibly exhales into the device and the sensors collect spirometric data. In the passive phase, the pump is activated to pump air from the device and inflate the subject's lungs to a specific capacity. The sensors monitor pressure and / or flow as the air is introduced into the subject's respiratory system. The data collected by the sensor is used to determine lung and airway specific parameters, including but not limited to, airway conductance, airway resistance, airway compliance and total lung capacity.

Implantable self-calibrating biosensor Subcutaneously or intracorporeally implantable biosensor, characterized by a closed microfluidic circuit with calibrating fluids, which communicates by a backward micro-dialysis logic with the exterior of said circuit, an open and in contact with the tissues and the interstitial fluid working electrode, for its self-calibration. One or more working electrodes may be positioned inside openable boxes from EAP, and be opened for the duration of the measurement and closed immediately after, succeeding one another in the measurement, as their sensitivity is diminished.

A disk brake, in particular for a motor vehicle, is provided. The disk includes a rotatable brake disk, a brake caliper covering the brake disk, an actuator for applying an actuation force and a friction lining applicable to the brake disk by means of the actuation force, and a device for measuring the actual braking force. In order to obtain the more reliable and accurate actual braking force measurement, the device for measuring the actual braking force uses the elastic enlargement of the brake caliper in the form of a measuring parameter and comprises an element having a first end secured to the brake caliper and a second free end, wherein a gap is formed in the extension direction between the brake caliper and the element. The device for measuring the actual braking force produces a signal according to the actual measure gap width.

A system for identifying chronic performance problems on data networks includes network monitoring devices that provide measurements of performance metrics such as latency, jitter, and throughput, and a processing system for analyzing measurement data to identify the onset of chronic performance problems. Network behavior is analyzed to develop a baseline performance level (e.g., computing a mean and variance of a baseline sample of performance metric measurements). An operating performance level is measured during operation of the network (e.g., computing a mean and variance of an operating sample of performance metric measurements). A chronic performance problem is identified if the operating performance level exceeds a performance threshold and a difference between the baseline performance level and the operating performance level is determined to be statistically significant. A t-test based on the baseline mean and variance and the operating mean and variance can be used to determine if this difference is significant.

The present invention relates to a digital tram gauge assembly having an extendible elongate tram bar having a first height rod at a first end and a second height rod at a second end. A digital measuring device is positionable about the tram bar and is capable of digitally sensing, displaying and wirelessly transmitting measurement data from the digital tram gauge. The digital measuring device further includes a digital level sensor that functions as a digital level comparator to indicate whether the tram gauge assembly is oriented substantially parallel to a user-defined reference datum plane.

A film thickness measuring device including: a terahertz wave generator; a prism that has an entrance surface, an abutment surface capable of abutting a surface of a sample including a first film on a side where the first film is formed, and an emission surface; a terahertz wave detector that detects an S-polarization component and a P-polarization component of a reflected wave from the sample, emitted from the emission surface of the prism; and a control section configured to determine a thickness of the first film formed in the sample, based on a difference between a time waveform of the S-polarization component of the reflected wave and a time waveform of the P-polarization component of the reflected wave.

The object of the invention relates to a method for acquisition and modelling of an incident wind field by a LiDAR sensor. Acquisition and modelling include a step of estimating the wind amplitudes and directions for a set of discretized points, and a step of incident wind field reconstruction in three dimensions and in real time. The invention also relates to a method of controlling and / or monitoring a wind turbine equipped with such a LiDAR sensor from the incident wind field reconstructed in three dimensions and in real time.

The present invention provides methods of measuring downhole the curvature of a borehole and, in a particular application of the invention, using the curvature information as an input component of a bias signal for controlling operation of a downhole bias unit in a directional drilling assembly.

Apparatus and method of measuring acoustic properties of a drumhead of a drum are disclosed. The acoustic properties are measured by exciting the drumhead with a source of energy and detecting the acoustic energy emitted by the drumhead. The acoustic energy emitted by the drumhead may be measured using a microphone or other acoustic sensor. The use of multiple energy sources provides isolation of acoustic energy and allows measurement of local resonance of the drumhead.

A flow measuring apparatus measures a fluid flow within a conduit including a wall. The apparatus includes a transducer arrangement including at least two transducers for alternately emitting and receiving ultrasonic radiation through the conduit wall and the flow. The apparatus also includes a signal processing arrangement for generating signals to excite the transducer arrangement and for processing received signals provided by the transducer arrangement for generating output signals from the signal processing arrangement indicative of properties of the flow. The transducer arrangement in cooperation with the conduit provides a first path for Lamb-wave ultrasonic radiation coupling directly from a first of the at least two transducers, to a second of said at least two transducers to generate a first received signal. The transducer arrangement in cooperation with the conduit provides at least one second path for ultrasonic propagation along the wall via Lamb waves coupling to at least a portion of the flow from a first of the at least two transducers to a second of the at least two transducers to generate a second received signal. The signal processing arrangement determines from said first and second received signals ultrasonic radiation propagation time periods through the first path and through the at least one second path, and to perform computational operations on the propagation time periods to determine properties of the flow including, but not limited to, at least one of: fluid flow velocity (v) in the conduit, a sound velocity (c) through the fluid.

The present invention relates a method for the enumeration of mammalian cell micronuclei, while distinguishing micronuclei from the chromatin of dead and dying cells. The method utilizes differential staining of chromatin from dead and dying cells, to distinguish the chromatin from micronuclei and nuclei that can be detected based upon fluorescent emission and light scatter following exposure to an excitatory light source. Counting of micronuclei events relative to the number of nuclei can be used to assess the DNA-damaging potential of a chemical agent, the DNA-damaging potential of a physical agent, the effects of an agent which can modify endogenously-induced DNA damage, and the effects of an agent which can modify exogenously-induced DNA damage. Kits for practicing the invention are also disclosed.

The present invention relates to a system for measuring the hemoglobin concentration in whole blood, wherein the system comprises: a light-radiating unit including a light source that emits two types of incident light having different wavelengths; a diffusion unit which diffuses the incident light emitted by the light-radiating unit; a cuvette-holding unit which is formed so as to hold a cuvette including a blood sample; a detection unit which detects each absorbance of the two types of incident light having different wavelengths; a processing unit which determines the hemoglobin concentration in the blood by processing the measured absorbance result; and a control unit which regulates the two types of incident light having different wavelengths in order to repeatedly / sequentially radiate same. Although the system for measuring hemoglobin in whole blood of the present invention uses a small amount of whole blood, it is possible to measure the total hemoglobin concentration in an accurate and reliable manner. The system of the present invention aligns the paths of two types of incident light having different wavelengths passing through a microcuvette by using a diffuser plate so as to easily align a light source and increase the reliability of the results. Also, the system of the present invention uses two wavelengths so as to rapidly and accurately measure the total amount of hemoglobin, including oxidized and reduced hemoglobin.

The invention discloses a sapphire crystal ingot profile measuring device. The device comprises a base, a rotating table, and a portal frame. The portal frame comprises two portals that are opposed to each other. The rotating table is disposed between the two portals. Each portal comprises two stand bars, a transmitter laser scan sensor and a receiver laser scan sensor. Each stand bar is vertically disposed on the base. Each transmitter laser scan sensor is slidingly disposed on one stand bar, and the receiver laser scan sensor is slidingly disposed on the other stand bar. A scan laser beam is formed between the transmitter laser scan sensor and the receiver laser scan sensor. The scan laser beam is used for scanning sizes of periphery and profile of a sapphire crystal ingot disposed on the rotating table from the top down and from different rotating angles, in order to reestablish 3D profile image of the sapphire crystal ingot with the help of interpolation algorithm. The device enables profile measurement of a sapphire crystal ingot in an efficient, reliable and accurate manner.

The present invention relates to a digital tram gauge assembly having an extendible elongate tram bar having a first height rod at a first end and a second height rod at a second end. A digital measuring device is positionable about the tram bar and is capable of digitally sensing, displaying and wirelessly transmitting measurement data from the digital tram gauge. The digital measuring device further includes a digital level sensor that functions as a digital level comparator to indicate whether the tram gauge assembly is oriented substantially parallel to a user-defined reference datum plane.

An auto focus system comprises an image capturing optical unit, an image capturing camera, an image acquisition and processing engine, an acutance index calculation engine, a motion control engine, a motion controller and a lens driving unit. An auto focus method measures image's acutance index rather than image's contrast value. An auto focus system employing the auto focus method of the present invention can accurately and reliably detect the best focus point and thus preventing auto focus malfunction even under the condition that illumination uniformity changes dramatically.

There is provided a method and apparatus for determining at least one of a position and an orientation of a wearable device on a subject. At least one physiological characteristic signal is acquired from a subject (402). The acquired at least one physiological characteristic signal from the subject has one or more characteristics indicative of at least one of a position and an orientation of a wearable device on the subject. The at least one of the position and orientation of the wearable device on the subject is determined based on the one or more characteristics indicative of the at least one of the position and orientation of the wearable device on the subject (404).

A method and a device are disclosed to determine the value of the resonant frequency of a resonant sensor subject to an acoustomechanical and / or dielectric load. The sensor is simultaneously and constantly excited at two different frequencies, the first of which is the series resonant frequency, while the second is introduced to detect and compensate the sensor parallel capacitance in an automatic and continuous way.

The present invention relates a method for the enumeration of mammalian cell micronuclei, while distinguishing micronuclei from the chromatin of dead and dying cells. The method utilizes differential staining of chromatin from dead and dying cells, to distinguish the chromatin from micronuclei and nuclei that can be detected based upon fluorescent emission and light scatter following exposure to an excitatory light source. Counting of micronuclei events relative to the number of nuclei can be used to assess the DNA-damaging potential of a chemical agent, the DNA-damaging potential of a physical agent, the effects of an agent which can modify endogenously-induced DNA damage, and the effects of an agent which can modify exogenously-induced DNA damage. Kits for practicing the invention are also disclosed.

In a method for detecting a change of a condition of a patient using an implantable medical device being connectable to the patient in at least one electrode configuration, at least one impedance measurement session is initiated to obtain at least one impedance value corresponding to an impedance of whole blood of the patient. At least one relative or absolute value of an amount of hematocrit in the blood of the patient is calculated using the at least one impedance value. A present hematocrit level is determined dependent on the at least one hematocrit value, with a change of the condition being derived from the present hematocrit level of the patient.

A vehicle air-conditioning system includes a duct housing therein an evaporator, an air-mixing mechanism, and a heater core that are successively arranged along the direction in which air is delivered by a blower to flow through the duct. A temperature sensor for detecting the temperature of the evaporator is disposed upstream of the evaporator with respect to the direction in which the air flows through the duct. The temperature sensor has at least a portion inserted in the evaporator.

A method of measuring morpho-geometrical parameters of a person wearing eyeglasses includes causing the person to observe a point situated in front at infinity while holding the head naturally on a direction (24) that is substantially horizontal, acquiring a first image of the position of the frame (21) in this first posture, causing the person to observe the target (8, 18) placed in a known position relative to the image acquisition system, by adopting a position that is natural and comfortable and that involves at least a tilting movement of the head; acquiring a second image of the position of the frame (21) in this second posture, determining the positions of the eyes (27) from one of the two images, computer processing of the two images obtained in order to determine the morpho-geometrical parameters of the person, and delivering the results of the measurements.

The present invention provides an optical sensor unit (10) for measuring gas concentration, comprising: sensor means (12, 13) and first thermal insulation means (14, 16) at least partially surrounding said sensor means (12, 13). The sensor means (12,13) includes at least one sensing layer (12) adapted to be irradiated with a predetermined radiation (100), and at least one gas-permeable layer (13) adjacent to one side of the at least one sensing layer (12) and adapted to pass gas, which concentration is to measured, through the gas-permeable layer (13) towards the at least one sensing layer (12). The optical sensor unit (10) is adapted to measure an optical response of the at least one sensing layer (12), which optical response depends on the gas concentration.

A semiconductor manufacturing apparatus and a wafer processing method are disclosed. The semiconductor manufacturing apparatus, comprises a rotatable device for supporting a wafer. A sensor for irradiating a laser beam onto a surface of the wafer and a detector including a plurality of modules for detecting the laser beam reflected from the wafer are also included. The sensor obtains information regarding the wafer, based on a change in the surface status of the wafer, which the modules sense when the laser beam is reflected from the wafer.

Measuring distance along a wire rope, by steps that include moving the wire rope across a sensor head; counting rotations of a rotary encoder driven by the moving wire rope; detecting a first distance marker crossing the sensor head at a first position of the wire rope; detecting a second distance marker crossing the sensor head at a second position of the wire rope; and establishing calibration parameters for producing a calibrated distance measurement corresponding to any output of the rotary encoder, based at least on correlating a known distance between the first and second distance markers to a counted number of pulses of the rotary encoder between the first and second positions of the wire rope.

A method of measuring morpho-geometrical parameters of a person wearing eyeglasses includes causing the person to observe a point situated in front at infinity while holding the head naturally on a direction (24) that is substantially horizontal, acquiring a first image of the position of the frame (21) in this first posture, causing the person to observe the target (8, 18) placed in a known position relative to the image acquisition system, by adopting a position that is natural and comfortable and that involves at least a tilting movement of the head; acquiring a second image of the position of the frame (21) in this second posture, determining the positions of the eyes (27) from one of the two images, computer processing of the two images obtained in order to determine the morpho-geometrical parameters of the person, and delivering the results of the measurements.