Abstract: According to one embodiment of the present invention, a method for adjusting a position of an object to compensate for tilt includes providing a rotatable base supporting an object and directing the object relative to the base such that the position of the object is controlled relative to a first axis. The object is stabilized along a second axis. The object is positioned relative to the base using at least one bearing arm. The at least one bearing arm movably couples the object to the base at a first position relative to a third axis and a fourth axis. The at least one bearing arm includes a first portion and a second portion, which are coincident with the third axis and fourth axis, respectively. The object is adjusted to a second position using the at least one bearing arms to maintain the first axis when a tilt angle of the base is detected.

Abstract: The present invention relates to a tension monitoring system comprising: —at least one camera for acquiring at least one image of at least one pattern located on an object of interest, wherein the pattern comprises a plurality of points and where each point is arranged on the object in such as way as to follow the movement of the object; —a computational device; wherein the computational device is arranged to analyze the acquired image for detecting the position of each pattern point using an image analysis algorithm arranged to determine the geometrical center of a point using a contrast detection method, determining the distance between at least two pattern portions, and calculating the tension induced in the object using a reference value of distance between the two pattern portions when the object is mechanically relaxed.

Abstract: An optical sensing device includes a shell, a partition structure, a pivot, a shading member, at least one light emitting member and at least one optical sensing member. The shell is formed with a black-body condition space having an arrangement chamber and a shading chamber adjacent to and communicated with the arrangement chamber. The partition structure partitions the arrangement chamber into a light emitting chamber and at least one optical sensing chamber. The pivot is set in the shading chamber. The shading member is located in the shading chamber and pivotally connected to the pivot. When the optical sensing device is tilted, the shading member is rotated in accordance with a tilting azimuth. The light emitting member is located in the light emitting chamber and projects a light beam. The optical sensing member is located in the optical sensing chamber and senses the light beam.

Abstract: An index error estimating apparatus used for an index error calibrating apparatus that has a grating disk supported by a rotation shaft and four detectors arranged on the grating disk. The index error estimating apparatus includes a detected value synthesizer that calculates a linear sum by multiplying by a predetermined coefficient each of detected values obtained from each of the at least four detectors; and a Fourier component identifier that uses a Fourier component of the linear sum and identifies a Fourier component of the index error.

Abstract: A method for calibrating a force measuring probe comprises providing a probe having an insertion tube with a distal tip, a joint comprising a resilient member, a joint sensor in conjunction with a processor coupled to the probe wherein the processor has a memory of an axial displacement threshold for the joint stored therein; applying force to the distal tip; measuring the displacement and deflection of the distal tip; correlating the measured displacement and deflection of the distal tip to the applied force and storing the correlation in the memory until reaching the axial displacement threshold; applying force greater than the axial displacement threshold to the distal tip to define a new force value; measuring the position of the distal tip in a plane transverse to the direction of force exerted on the distal tip; correlating the measured position of the distal tip in the plane transverse to the direction of force to the new force value and storing the correlation in the memory until reaching a pre-establ

Abstract: Techniques for estimating compass and gyroscope biases for handheld devices are disclosed. The compass bias can be determined by causing a small movement of the handheld device and comparing the data obtained from the compass with the data obtained from the gyroscope. The gyroscope bias can be determined by obtaining a quaternion based angular velocity term of the handheld device when the accelerometer and compass data are reliable, and then comparing the angular velocity term with the gyro data to estimate the gyro bias. When the compass and/or the accelerometer data are unreliable, a previously determined quaternion angular velocity term is used. The gyroscope bias can also be determined by measuring gyroscope biases at various temperatures in a non-factory setting, storing the data in a memory, and using the data to estimate gyro biases when the accelerometer and/or the compass data are unreliable.

Abstract: An angle detecting device with self-calibration function, in which sensor heads are provided with an equiangular interval on a scale disc fixed to a rotating shaft, one sensor head is selected as reference, a sum of measurement differences between the reference and another sensor head is divided by the number of sensor heads, to determine an average, whereby a self-calibration value is obtained, in which a sensor head of the reference is changed to another in order, and the respective self-calibration value is obtained, which value is deviated by an angle of arrangement with respect to a particular sensor head, and a phase is aligned to a self-calibration value of the particular one as the reference, to determine an average for calculations of this phase conversion, which average is subtracted from the respective calculation subjected to the phase conversion, to obtain only asynchronous angular errors.

Abstract: The invention concerns a method of and apparatus for measurement and/or calibration of the position of an object in space in such embodiment where the apparatus contains at least one moving arm fitted to the frame on one end and on the other end fitted to a platform, where the platform can be attached to the object to be measured or calibrated; during the motion of the object with the platform attached the relative positions of individual members of at least one moving arm, frame and platform are read and the measured data is used for determination of the position of the object or for its calibration.

Abstract: A test auxiliary device for testing a portable data terminal having a plurality of sensors includes a base, a carrying unit, a driving unit, and a controlling unit. The carrying unit is disposed on the base and includes a carrying platform and a carrying base. The carrying platform and the carrying base form a first angle and a second angle with the base, respectively, and thereby together form a compound slope. The driving unit drives the carrying unit to move, allowing the carrying platform to move with acceleration and at an angular velocity. The controlling unit receives sensing values generated by the sensors, respectively. The test auxiliary device further includes a test matching unit for testing the sensors in operation. Accordingly, the test auxiliary device assists users in determining whether the sensors of the portable data terminal are functioning well.

Abstract: The invention relates to a calibration method that can be carried out without a reference system for an angle measuring device having a code carrier carrying an absolute position code, and at least two reading heads comprising a fixed, known angle position at an angular distance, wherein the code carrier can be rotated relative to the reading heads, and different angle positions of the code carrier relative to the reading heads can thus be captured. Angle position values of the reading heads in an angular setting are determined and angular error is determined, which are repeated. And, a mathematical analysis method is performed, including determining the parameters of a mathematical function quantifying the angular error, and determining calibration parameters as parameters of the quantifying mathematical function or as a correction or code table derived from the parameters.

Abstract: A system includes a rotary device, a rotary absolute position (RAP) sensor generating encoded pairs of voltage signals describing positional data of the rotary device, a host machine, and an algorithm. The algorithm calculates calibration parameters usable to determine an absolute position of the rotary device using the encoded pairs, and is adapted for linearly-mapping an ellipse defined by the encoded pairs to thereby calculate the calibration parameters. A method of calibrating the RAP sensor includes measuring the rotary position as encoded pairs of voltage signals, linearly-mapping an ellipse defined by the encoded pairs to thereby calculate the calibration parameters, and calculating an absolute position of the rotary device using the calibration parameters. The calibration parameters include a positive definite matrix (A) and a center point (q) of the ellipse. The voltage signals may include an encoded sine and cosine of a rotary angle of the rotary device.

Abstract: A method for carrying out a functional analysis on a person equipped with an artificial extremity having adjustable settings. The method includes the steps of providing a sensor assembly configured as a replacement for a part of the artificial extremity and installing the sensor assembly in place of the part. Forces, accelerations and/or torques are then measured with the sensor assembly during use of the artificial extremity by the person and the settings of the artificial extremity are optimized based on these measurements. The sensor assembly is removed and the replaced part is installed back into the artificial extremity, while retaining the optimized settings. In one embodiment, the artificial extremity is a leg prosthesis having an artificial knee joint with a rotational adaptor mounted above it. The sensor assembly then replaces the rotational adaptor.

Abstract: The disclosure relates to an actuating drive having a position transmitter for control of an actuating element with a position in a process installation. The position transmitter is equipped with a rotary measurement system whose pivoting range is mechanically limited, with the rotary measurement system having a shaft which is connected to a pick-up lever in an interlocking and unconfusable manner, which pick-up lever is articulated by means of the actuating drive or the actuating element. The shaft and the rotary measurement system are connected to one another via a slipping clutch. Markings are arranged isoazimuthally with respect to the rotation axis of the shaft, on the shaft circumference, and include angle information about the angle of the marking position with respect to the pick-up lever. The digital position transmitter has a sensor system for identification and evaluation of the markings. The slipping clutch has hysteresis.

Abstract: An angle detection apparatus includes a grating disk supported by a rotation axis and three or more detectors arrayed proximate to a front surface of the grating disk at equal distances in a circumferential direction of the grating disk. A rotation angle of the grating disk rotated by a reference angle from a predetermined initial position is detected by each of the detectors. An angle error at each of the detectors is measured from a difference between the rotation angle and the reference angle. A tangential vector is acquired by rotating by 90° a directional vector of each of the detectors relative to the rotation center. An eccentricity vector is calculated whose inner product with the tangential vector is the angle error.

Abstract: There is described a method for monitoring a drive device for a defective sensor signal from a first sensor of the drive device and to a monitoring device which is suitable for this purpose. Although sensors operate reliably, sensor errors which may give rise to significant damage if they are not detected may arise. Monitoring the sensor makes it possible to increase the reliability of the drive device. The sensor signal from the first sensor is compared with a sensor signal from a second sensor in such a manner that the first sensor is monitored. In this case, the monitoring device is intended, in particular, for a sensor having a sensor disc.

Abstract: A downhole sensor calibration apparatus includes a rotational or gimbaling mechanism for guiding a sensing axis of an orientation responsive sensor through a three-dimensional orbit about three orthogonal axes. A method includes using measurements taken over the three-dimensional orbit to calibrate the sensor and determine other characteristics of the sensor or tool.

Abstract: A method for calibrating the steering configuration for a marine propulsion system provides a procedure by which the steering alignment is changed by a known and symmetrical amount in order to identify and characterize the effect that such a change has on the operating efficiency of the marine vessel. Before the calibrating process is completed, the overall consistency of the vessel operation is measured to determine that the conditions are correct for the calibration procedure to commence. After analyzing the consistency of operation of the marine vessel, known and symmetrical changes, or perturbations, in the steering system are made and the effect of those changes are determined as a function of the fuel usage by the marine vessel. The effects on fuel usage are characterized as being beneficial, harmful, or negligible.

Abstract: In a method for determining an offset of measured values of a multiaxial directional sensor using a superposed signal, a large number of multiaxial measured values are recorded first. Measured values, which are recorded in different orientations of the directional sensor, form a geometric figure in a coordinate system resulting from the measuring axes of the sensor, the ideal form of the geometric figure being known and the ideal center point of which being located at the origin of the measuring axes. In the case of a biaxial sensor, the geometric figure is a circle; in the case of a triaxial sensor, it is a sphere around the origin. The superposition caused by the interference is reflected in that the center point of the geometric figure is shifted in relation to the origin of the measuring axes. The offset is measured by determining this shift.

Abstract: An optical sensing device comprising a shell, at least one light emitting member, at least one optical sensing member and a shading member is disclosed. The shell is formed with a black-body condition space therein, and the light emitting member projects a light beam into the black-body condition space. The optical sensing member is located within the shell and neighboring to the black-body condition space. The shading member is movably arranged within the black-body condition space. At least one end surface of the shading member is contacted with the shell and formed with at least one recess. When the shading member moves to at least one shading region within the black-body condition space, the optical sensing member is shaded by the shading member; and when the shading member moves apart the shading region, the optical sensing member senses the light beam to accordingly send out a sensing signal.

Abstract: An apparatus for providing information pertaining to the orientation of a vehicle to which the apparatus is coupled includes a chassis having a first interior surface and an inertial-sensor assembly disposed within the chassis and having a first exterior surface. A first sensor element is mounted on the first interior surface, and a second sensor element is mounted on the first exterior surface. At least one of the first and second sensor elements is configured to generate a first signal corresponding to an angle of displacement of the second sensor element with respect to the first sensor element.

Abstract: An apparatus for providing information pertaining to the orientation of a vehicle to which the apparatus is coupled includes a chassis having a first interior surface and an inertial-sensor assembly disposed within the chassis and having a first exterior surface. A first sensor element is mounted on the first interior surface, and a second sensor element is mounted on the first exterior surface. At least one of the first and second sensor elements is configured to generate a first signal corresponding to a distance of displacement of the second sensor element with respect to the first sensor element.

Abstract: An offset compensation circuit for a yaw rate sensor, having a subtracter, which is provided for subtracting a correction value from an input signal, the correction value being obtainable by dividing each of n measurements of the input signal by the constant n and subsequently integrating a number of n quotients into an integrator. Furthermore, a yaw rate sensor having such an offset compensation circuit.

Abstract: A method of navigation includes providing an angular rate sensor and a direction-of-gravity reference. The method also includes determining bias error of the angular rate sensor about a vertical axis based on data substantially from the angular rate sensor and from the direction-of-gravity reference. In one embodiment, the first angular rate sensor is moved from a first position around a substantially horizontal axis to a second position around the substantially horizontal axis. The first angular rate sensor provides angular rate data for attitude at the first position and for compass heading at the second position. Data from the first angular rate sensor and from the direction-of-gravity reference is processed with a program for determining a bias error correction for the first angular rate sensor while the first angular rate sensor is in the first position.

Abstract: A digital angle gauge includes a gauge body having a reference surface that is engageable with an object to be measured for angular inclination. An angle sensor and processor mounted in the body determine an inclination angle of the object with which the reference surface of the gauge body is engaged. A digital screen is pivotally mounted to the gauge body for visually displaying the determined inclination.

Abstract: A method and apparatus for bearing thrust monitoring allows measurable detection of tilt of a support bearing (52 or 56) for a roller (34 or 36) which rotatably supports a rotating body (22). A tilt meter (75 or 77) adapted to measurably detect a tilt of the support bearing is coupled to the support bearing (52 or 56), where the tilt is defined as an angular difference in bearing orientation between a first bearing position and a second subsequent bearing position that is cause by an axial thrust on the rotary body (22). Once tilt is detected, the bearing orientation of the support bearing (52 or 56) can be adjusted to return the support bearing (52 or 56) to substantially the first bearing position.

Abstract: The invention concerns a method for controlling automatic transmission (3) of a vehicle comprising an engine (2) driving the transmission (3) which consists in: detecting a downhill situation of the vehicle, and selecting a transmission ratio so that the engine absorbs energy, storing a longitudinal speed of downhill start (Vmin) when the vehicle starts going downhill, and while the vehicle is running downhill, comparing the current speed (V) of the vehicle with the downhill start speed (Vmin) such that the current speed (V) exceeds the downhill start speed (Vmin) by a predetermined difference (VS), then controlling the transmission to trigger downshifting.

Abstract: A system and method is disclosed for calibrating a semiconductor wafer handling robot and a semiconductor wafer cassette. A robot blade boot is attached to a robot blade of the semiconductor handling robot. The robot blade boot decreases a value of tolerance for the robot blade to move between two semiconductor wafers in the semiconductor wafer cassette. In one embodiment the vertical tolerance is decreased to approximately twenty thousandths of an inch (0.020?) on a top and a bottom of the robot blade boot. The use of the robot blade boot makes the calibration steps more critical and precise. The robot blade boot is removed from the robot blade after the calibration process has been completed.

Abstract: A system includes a rotary device, a rotary absolute position (RAP) sensor generating encoded pairs of voltage signals describing positional data of the rotary device, a host machine, and an algorithm. The algorithm calculates calibration parameters usable to determine an absolute position of the rotary device using the encoded pairs, and is adapted for linearly-mapping an ellipse defined by the encoded pairs to thereby calculate the calibration parameters. A method of calibrating the RAP sensor includes measuring the rotary position as encoded pairs of voltage signals, linearly-mapping an ellipse defined by the encoded pairs to thereby calculate the calibration parameters, and calculating an absolute position of the rotary device using the calibration parameters. The calibration parameters include a positive definite matrix (A) and a center point (q) of the ellipse. The voltage signals may include an encoded sine and cosine of a rotary angle of the rotary device.

Abstract: Provided is an apparatus for precisely correcting position and attitude information of a camera by analyzing image information received through a three line scanner in operation of the camera obtaining the position and attitude information from a Global Navigation Satellite System (GNSS) and an Inertial Navigation System (INS), and a method thereof. The method for correcting position and attitude information of a camera includes the steps of: a) calculating the position of the camera by using the GNSS; b) calculating the attitude of the camera by using the INS; c) generating the position and attitude correction information of the camera by analyzing an image received through a three line scanner mounted in the camera; and d) receiving a feedback of the position and attitude correction information in the GNSS and the INS.

Abstract: According to one embodiment of the present invention, a method for adjusting a position of an object to compensate for tilt includes providing a rotatable base supporting an object and directing the object relative to the base such that the position of the object is controlled relative to a first axis. The object is stabilized along a second axis. The object is positioned relative to the base using at least one bearing arm. The at least one bearing arm movably couples the object to the base at a first position relative to a third axis and a fourth axis. The at least one bearing arm includes a first portion and a second portion, which are coincident with the third axis and fourth axis, respectively. The object is adjusted to a second position using the at least one bearing arms to maintain the first axis when a tilt angle of the base is detected.

Abstract: An electric mirror control device provided with a proportionality constant conversion means for converting the proportionality constant of a detection output voltage to the angle of a mirror surface to be positive or negative. When an up-down sensor and a right-left sensor for detecting the angle of the mirror surface have a plurality of specifications, each of which has a different proportionality constant of the detection output voltage to the angle of the mirror surface, controller determines the specification of the angle sensors based on whether the proportionality constant of the detection output voltage output via the proportionality constant conversion means is positive or negative, and controls an up-down motor or a right-left motor in accordance with the determined specification stored in advance.

Abstract: The present invention provides a method for calibrating a geodetic instrument, an instrument and a computer program product thereof. In the method and geodetic instrument of the present invention, a value of at least one parameter affecting the measurements made by the instrument is detected and compared with a predetermined threshold. On the basis of the comparison between the detected value and the predetermined threshold, the instrument aims at a reference target and a calibration is performed using the reference target. The present invention is advantageous in that the accuracy and reliability of the measurements performed by the instrument are increased. Further, the present invention is advantageous in that the requirements on mechanical stability are reduced.

Abstract: Disclosed is a system and method for intra-operatively spatially calibrating an ultrasound probe. The method includes determining the relative changes in ultrasound images of a phantom, or high-contrast feature points within a target volume, for three different ultrasound positions. Spatially calibrating the ultrasound probe includes measuring the change in position and orientation of the probe and computing a calibration matrix based on the measured changes in probe position and orientation and the estimated changes in position and orientation of the phantom.

Abstract: An electronic device is provided with an inclination sensor for computing inclination, a control unit which conducts predetermined control based on a value computed by the inclination sensor, a case which has the inclination sensor and the control unit therein, and a suspension portion for suspending the case, and the control unit controls correction of the reference value of the inclination sensor based on a state where the case is suspended by the suspension portion and still.

Abstract: The present technical solution provided allows it to determine true meridian of any movable object. This solution is based on determining true meridian by zero value of linear acceleration induced created by changing the projection of the vector of linear velocity, caused by rotating any heavenly body, in particular, the terrestrial globe. The determination is implemented in compact variant only by the devices located on the movable object without any necessity of using induced radiations, quickly and accurately without any necessity of knowing the coordinates of location and the speed of movement irrespective of weather conditions, transverse accelerations, temperature changes and external magnetic fields influence.

Abstract: According to a method for initializing an indicating instrument for a vehicle, zero-reset processing is performed. In the zero-reset processing, a control device is made to control a drive signal to rotate a pointer in a zero-reset direction in order to force a step motor to lose synchronization. Furthermore, synchronization loss detection processing is performed. In the detection processing, a physical phenomenon generated in a rotary drive system due to forcible synchronization loss of the motor during the zero-reset processing, is detected. Then, an electrical angle of the drive signal at a time of detection of the phenomenon is selected as a synchronization loss electrical angle. Finally, zero point setting processing is performed. In the setting processing, the electrical angle phase-shifted from the synchronization loss electrical angle in an indication value increasing direction by 180 degrees or less, is set as a zero point stored in the control device.

Abstract: Some embodiments of the present invention provide a system that generates a simulated vibration pattern in a computer subsystem. During operation, a vibration pattern is monitored at a location in the computer subsystem, wherein the vibration pattern is monitored while the computer subsystem is incorporated into the computer system and the computer system is operating. Then, the vibrations of the computer subsystem are mimicked by generating the simulated vibration pattern at the same location in the computer subsystem based on the monitored vibration pattern.

Abstract: An embodiment of the invention includes using a set of telescopes to calibrate a three dimensional optical scanner. Three separate calibrations are disclosed for a survey grade calibration: (1) angular calibration, implemented using at least one anti-podal pair of telescopes, (2) range calibration, implemented using at least one telescope mounted fiber recirculator, and (3) tilt calibration, implemented using at least one pair of telescopes not mounted in anti-podal configuration and an integral tilt table. Methods for aligning or measuring the mis-alignment between anti-podal telescope pairs are also described.

Abstract: A system and method for calibrating an absolute angular position sensor and/or for providing pre-calibrated absolute angular position sensors comprises comparing, at a pre-elected number of angular positions, the angular position derived from the output of the sensor to the angular position reported by a reference sensor. The difference between the two outputs is used as an error correcting factor for the respective position. In addition to calibrating the sensor to reduce sensor errors, the calibration can also be used to determine the sensor output corresponding to an index position of interest.

Abstract: A system for aligning a vehicle to an object and a method for calibrating same is disclosed. The system comprises three light sources which are calibrated when the vehicle and object are in desired alignment. After initial calibration, the light sources project images which converge in a predetermined configuration on a reflecting surface. The reflecting surface is positioned in a fixed location relative to the object to which the vehicle is being aligned. The convergence of the projected images indicates to the operator of the vehicle that the vehicle and the object are in desired alignment. The light sources may be rotatably attached to the vehicle such that the roll, pitch, and yaw of each light source may be adjusted during calibration.

Abstract: A traveling apparatus is provided with two wheels parallel each of which is driven independently, being controlled to be stable in an anteroposterior direction between the two wheels and traveling. The traveling apparatus includes a mechanism estimating an inclination of a plane where a pitch angular velocity sensor is horizontally installed with respect to a horizontal plane by using a sensor measuring a tilt of a vehicle body in a roll axis direction and a mechanism calculating a correct pitch angle by obtaining a yaw rate mixed in the pitch angular velocity sensor based on the estimated inclination and a turn velocity of the vehicle body and by canceling the yaw rate mixed.

Abstract: An estimated gradient value of a road is calculated based on a vehicle acceleration “A” and a time varying portion “A?” of a wheel speed. In a case that an acceleration corresponding value “Ggrad0” for the estimated gradient value is not regarded as indicating an exact figure, due to influences of disturbances, the acceleration corresponding value “Ggrad0” is corrected by a limiting value for rate-of-change with regard to the road gradient depending on respective vehicle speed, and by a limiting value for the road gradient. As a result, the acceleration corresponding value “Ggrad” for the estimated gradient value can be more exactly obtained.

Abstract: A method of operating a coordinate positioning apparatus having a surface sensor that is rotatable about at least a first axis. The method comprises obtaining a first measurement with the surface sensor at a first angular orientation and obtaining a at least a second measurement with the surface sensor at a second angular orientation. The first and second angular orientations are different to each other such that any offset of the surface sensor from an expected position will have at least a partially opposing affect on the first and second measurements. The method then compensates and/or establishes for the offset using the first and second measurements.

Abstract: A method for detecting the angular position of a gas knob of a motorcycle; the method presents the steps of: detecting simultaneously four mutually redundant measurements of the angular position of the gas knob by means of two mutually independent angular-position sensors forming part of an acquisition system; making a cross comparison two by two between the four measurements for diagnosing any possible malfunctioning of the angular-position sensors; and determining the angular position of the gas knob, using at least one measurement supplied by an angular-position sensor operating properly.

Abstract: A Centralizer based Survey and Navigation (CSN) device designed to provide borehole or passageway position information. The CSN device can include one or more displacement sensors, centralizers, an odometry sensor, a borehole initialization system, and navigation algorithm implementing processor(s). Also, methods of using the CSN device for in-hole survey and navigation.

Abstract: A failure detection device for detecting a failure of a rotation angle detection sensor, which sensor detects a rotational angle through which a rotary member has rotated, the failure detection device including a first detection element which has an output which increases as the rotational angle of the rotary member increases, a second detection element which has an output that decreases as the rotational angle of the rotary member increases, and a detecting unit that detects the failure of either the first detection element or the second detection element by comparing a calculated value, based on the outputs of both of the first and second detection elements, with at least one predetermined value.

Abstract: A motion estimation method and system for a mobile body are provided. The method includes: obtaining magnetic field information from compass information of the mobile body; comparing the magnetic field of the mobile body with a predetermined value and determining whether a position of the mobile body belongs to a specific region according to the comparison result; and estimating a direction of the mobile body by determining whether a compass azimuth angle is used for direction estimation of the mobile body according to the determination result.

Abstract: The present disclosure includes an extendable plumb and level measuring device and associated usage method. The device can utilize interconnected members including a first, a second, and a third member. For example, the third member can be slidingly disposed within the first and second members to extend the device to a set and arbitrary length. The measuring device utilizes a spirit level or digital reader to determine when the device itself is level responsive to positioning a extendable stopper against a construction, such as a wall, door, panel, and the like. Once level, a measuring device, such as a ruler, disposed within the device can be utilized to measure the plumb of the construction. Additionally, the device can function as an extendable level to measure an arbitrary length.

Abstract: A method and apparatus for calibrating a gyro-sensor, by which a gyro-sensor can be calibrated using data which is obtained by measuring an angular velocity and a gyro output value of a moving body equipped with the gyro-sensor. The method includes measuring an angular velocity of a moving body and an average output value of the gyro-sensor when the moving body, equipped with the gyro-sensor, rotates, obtaining data about a characteristic equation of the gyro sensor using the measured angular velocity and the average output value and storing the data, and calibrating the gyro-sensor using the stored data about the characteristic equation.

Abstract: This invention relates to an apparatus for boresighting a device with respect to a fixed position and/or a boresight of another device. Typical devices include various types of cameras, firearms and/or antennas. The apparatus includes a first plate and a second plate movable with respect to each other and a fixed location by a pivot rod. The first plate and the second plate are locked with respect to each other by at least one fastener. The apparatus includes adjustment of the pitch angle and the yaw angle of the device. This invention also relates to a method of boresighting a device with respect to the boresight of a second device.