188results about How to "Solving precise measurements" patented technology

Alignment accuracy between two or more patterned layers is measured using a metrology target comprising substantially overlapping diffraction gratings formed in a test area of the layers being tested. An optical instrument illuminates all or part of the target area and measures the optical response. The instrument can measure transmission, reflectance, and/or ellipsometric parameters as a function of wavelength, polar angle of incidence, azimuthal angle of incidence, and/or polarization of the illumination and detected light. Overlay error or offset between those layers containing the test gratings is determined by a processor programmed to calculate an optical response for a set of parameters that include overlay error, using a model that accounts for diffraction by the gratings and interaction of the gratings with each others' diffracted field. The model parameters might also take account of manufactured asymmetries. The calculation may involve interpolation of pre-computed entries from a database accessible to the processor. The calculated and measured responses are iteratively compared and the model parameters changed to minimize the difference.

Embodiments of the solid-state storage system provided herein are configured to perform improved mechanisms for testing of error recovery of solid state storage devices. In some embodiments, the system is configured to introduce or inject errors into data storage commands or operations performed in the non-volatile memory. Injected errors include corruption of data stored in the non-volatile memory, deliberate failure to execute storage operations, and errors injected into communication protocols used between various elements of the device. In some embodiments, injected errors can include direct errors that trigger an immediate execution of error recovery mechanisms and delayed errors that trigger execution of error recovery mechanisms at a later time. Error recovery mechanisms can be tested in an efficient, reliable, and deterministic manner to help ensure effective operation of storage devices. The integrity of non-volatile memory can also be tested.

An acetabular shell liner having a variable rim surface geometry, which improves range of motion of the femoral component within the liner and decreases the incidence of dislocation and subluxation, and methods of making and using the acetabular shell liner. Prosthetic devices, more particularly hip joint prostheses, containing the acetabular shell liner having a variable rim surface geometry are also provided.

Methods and systems are provided for downhole analysis of formation fluids by deriving fluid properties and associated uncertainty in the predicted fluid properties based on downhole data, and generating answer products of interest based on differences in the fluid properties. Measured data are used to compute levels of contamination in downhole fluids using an oil-base mud contamination monitoring (OCM) algorithm. Fluid properties are predicted for the fluids and uncertainties in predicted fluid properties are derived. A statistical framework is provided for comparing the fluids to generate, in real-time, robust answer products relating to the formation fluids and reservoirs thereof. Systematic errors in measured data are reduced or eliminated by preferred sampling procedures.

A positioning method, which is related to a technique to measure a correct position of a terminal by preventing time required for the position measurement, of calculating a position of a receiver according to signals from a plurality of wireless transmitters includes a first step of measuring propagation delay time of the signal from each of the wireless transmitters and calculating a position of the receiver and a standard deviation about measuring distance error, a second step of calculating a positioning error of the receiver a third step of determining, according to the positioning error calculated by the second step, wireless transmitters in directions nearer to a direction in which the positioning error is large, and a fourth step of re-detecting signals from the wireless transmitters determined by the third step and thereby re-calculating the position of the receiver.

A position measuring device for detecting the relative position of a scanning unit and a scale. The position measuring device includes a scale and a scanning unit that is displaced with respect to the scale in a measuring direction. The scanning unit includes a scanning grating, a ridge prism and an optoelectronic detector element. The ridge prism having a ridge that is oriented parallel with the measuring direction, the ridge prism acts as a retro-reflector in a second direction which is aligned in a plane of the scale vertically with respect to the measuring direction.

The invention provides a method for determining a whole-cycle ambiguity of a three-frequency carrier phase of a BeiDou navigation system. The method comprises the steps of by utilizing the advantage of high determination accuracy rate of a whole-cycle ambiguity of a BeiDou ultra-wide lane carrier phase combination, firstly determining whole-cycle ambiguities of two groups of ultra-wide lane carrier phase combinations, and correcting a pseudo-range initial value through the whole-cycle ambiguities of the ultra-wide lane carrier phase combinations; meanwhile, removing influences from an orbit error, a clock error and an ionized layer error in original observed quantity by combining with carrier phase observation quantity of geometry-free de-ionized layer composed of a narrow lane carrier phase combination, so as to enable the resolution of the whole-cycle ambiguity of the narrow lane carrier phase combination to be only affected by random measurement noise; taking an average value of combined observation quantity of multiple epochs to remove random noise error and determine the whole-cycle ambiguity of the narrow lane carrier phase combination; finally, determining the whole-cycle ambiguity of the carrier phases of three frequencies B1, B2 and B3 by resolving a system of linear equations which is composed of the whole-cycle ambiguities of the two ultra-wide lane carrier phase combinations and the whole-cycle ambiguity of the narrow lane carrier phase combination.

An improvement on the structure of a measuring tape device is that a magnetic mechanism is secured at the distal end of a measuring tape. The magnetic mechanism is not placed onto the leg piece of the hook member and thus is not formed as part of the body of the hook member of the measuring tape. The front end of the magnetic mechanism is placed in alignment with the “0” cm mark on the measuring tape. During measuring process of an object of measurement and a designated point, the magnetic mechanism allows the measuring tape to be magnetically attached to the surface of the object and anchored at the exact starting point of measurement, and therefore, the measuring precision will not be skewed because of thickness of the hook member or because of the gap caused by the movable mechanics of the hook member.

A biological information measuring apparatus (measuring apparatus) includes a band which fixes a case unit to a living body. The band is provided with a recessed groove part on a side facing the living body. The groove part has a depth of 1020 μm or more and 1140 μm or less.

The error of a measurement system can be corrected even if the frequency of an input signal of a device under test is different from that of the output signal. A signal output acquiring section acquires the power of the input signal by means of a power meter not shown in the drawing. Thus, errors due to frequency tracking can be separated depending on the direction in a signal flow graph. Since a receiver measures the parameter concerning the received signal when a signal source is directly connected to receiving means, the measurement system error factor of the receiving means can be acquired. The parameter of a device under test can be measured while the error is corrected when the results of measurement, concerning the device under test of receivers are combined.

The air flow inhaled into the internal combustion engine is calculated based on the operation state of the electric motor, the operational state of the bypass valve and the signal of the intake air flow sensor. Immediately after the bypass valve is opened when the electric motor is running, the air flow inhaled into the internal combustion engine may be calculated by acquiring the bypass air flow through the bypass passage and using the acquired bypass air flow to correct the intake air flow measured from the signal of the intake air flow sensor. Based on the calculated air flow inhaled into the internal combustion engine, control parameters which concern the output power of the internal combustion engine are adjusted.

A method for operating a vehicle is provided. The method includes, in one example during a first a rate of change of an inclination of the vehicle, adjusting a fuel level indication based on the inclination and a level of fuel within the fuel tank; and during a second rate of change of the inclination different from the first rate of change, adjusting the fuel level indication based on actual fuel consumption of the engine. In this way, it is possible to provide an accurate fuel level indication based on the inclination when the inclination is not changing too quickly. However, when inclination is changing quickly and may give degraded level readings, it is still possible to provide an accurate fuel level by transiently estimating fuel usage and using, for example, a previous fuel level reading from when the inclination was not changing too quickly.

Apparatus and methods are provided for measuring thread leads or pitches using a metrology probe. The probe may be, for example, either a contact probe or a laser probe. The probe is mounted on the end of an articulating arm that has sensors to provide precise three-dimensional coordinates of the probe's location and orientation. The probe determines surface coordinates of the threaded object repetitively in different locations according to a program provided by a computer connected to the arm. When enough data have been gathered, the computer calculates and outputs a surface profile of the threaded object, including a lead or pitch measurement.

A container for measuring a predetermined amount of liquid and dispensing that measured amount. The container includes a reservoir chamber, a measuring and dispensing chamber, and a conduit or tube for transferring liquid from the reservoir chamber to the measuring and dispensing chamber. The reservoir chamber has flexible walls which can be squeezed to drive liquid from the reservoir chamber into the measuring chamber. The passage from the reservoir to the measuring and dispensing chamber is configured and its outlet arranged so that liquid entering the chamber flows down a wall thereof.

The invention relates to a reference object (3) and a method for checking a measuring system (1), wherein a plurality of three-dimensional recordings (4, 8) of a reference object are recorded from different recording directions (5) by means of the measuring system (1). The reference object (3) has a closed shape, wherein each of the three-dimensional recordings (4) is registered with at least the preceding recording (4). In the case of a faulty calibration and/or in the case of a faulty registration, the individual recordings (4, 8) are deformed compared to the actual shape of the reference object (3), so that the deformation continues when assembling the individual three-dimensional recordings (4) to form an overall recording (54) and the generated overall recording (54) deviates in its dimensions from the dimensions of the reference object (3) as a result thereof. At least one object region (10) of the reference object (3) is measured twice, at the beginning of a circuit and at the end of the circuit, wherein a distance (55) is determined in the overall recording (54) between a first position of the object region (10) in a first recording at the beginning of the circuit and a second position of the object region (10) in a second recording at the end of the circuit.

There is provided an acceleration sensor including: a weight portion; plural fixed portions formed above a bottom plate around a periphery of the weight portion; a beam portion coupling the fixed portions and the weight portion, and holding the weight portion at a position separated from the bottom plate; a detection portion provided at the beam portion and detecting deformation of the beam portion; a frame portion provided so as to project out from the bottom plate and surround the fixed portions at a position separated from the fixed portions; and a lid portion of plate shape that seals an opening of the frame portion.

A method and apparatus for measuring a part with a contact probe mounted on a coordinate positioning machine. The method includes measuring a plurality of points on the part when both the part and contact probe are moving continuously between different positions within the coordinate positioning machine. The probe moves, relative to the part, along a scan path such that substantially coincident points that are closely located together along a curve or surface being measured are measured at relatively far apart positions in the machine and at relatively far apart positions along the scan path.

The present invention discloses the methods and apparatus to acquire, record, and analyze data to determine the draft of a water-borne vessel and/or the amount of cargo that has been loaded in a water-borne vessel. The apparatus includes a portable, handheld housing containing means for use in positioning the housing in a predetermined location and spatial orientation. Such means can include one or more narrow beam emitting devices, such as lasers or other similar devices, or a camera or other image processing level sensors. The housing also containing an ultrasonic transducer and receiver, or alternatively, a laser emitter and receiver, that directs sound pulses or light, respectively, toward the surface of the water body in which the vessel is placed. Within the housing is electrical circuitry to receive either the sound or light beam signals, and from these signals produce a signal representative of the time of travel of the sound pulse or light. This signal will be transmitted wirelessly to a PDA or similar device that utilizes an arraying analytical technique on the received signals to determine the distance of the vessel above the waterline. The data representing the distance of the vessel above the waterline will then be either further processed by the PDA, or transmitted wirelessly to a central computer, for use in conjunction with displacement characteristics and cargo unit weight to determine the amount of cargo that has been loaded in the vessel. A collapsible or telescopic handle or other similar device may be attached to the housing to both facilitate carrying the apparatus to the field site, as well as to facilitate the positioning of the housing at the desired draft line while permitting the marine surveyor to stand on the vessel deck. For ease of use controls for operating the apparatus are preferably attachable to the handle.