38results about How to "Correct drift" patented technology

A device and method that uses terrain features having one or more predetermined characteristics or weights in an electronic image date frame or set of frames such as a LIDAR voxel set of image data frames for use as system reference points which are, in turn, used in one or more trilateration calculations performed in electronic circuitry to determine a position or ego-motion of the device.

A control device includes a two-dimensional inertial system configured to measure an acceleration of the control device. A control circuit is coupled to the two-dimensional inertial system where the control circuit is configured to receive acceleration information for the acceleration measured by the two-dimensional inertial system. The control circuit is further configured to integrate the acceleration information to calculate the velocity of the control device and determine if the velocity of the control device becomes zero along one or both of the two dimensions for which the two-dimensional inertial system is configured to measure acceleration. The control circuit is further configured to correct a drift in the velocity if the control circuit determines that the velocity is zero along one or both of the two dimensions.

The present solution provides autonomous robotic technologies for industrial inspection that can flexibly scale to meet many different types of industrial inspection. By utilizing the autonomous robotic technologies disclosed herein, increasingly large and complex industrial inspections may be completed in a fraction of the time previously required for inspections of smaller scales.

A free piston engine is configured with a pair of opposed engine cylinders located on opposite sides of a fluid pumping assembly. An inner piston assembly includes a pair of inner pistons, one each operatively located in a respective one of the engine cylinders, with a push rod connected between the inner pistons. The push rod extends through an inner pumping chamber in the fluid pumping assembly and forms a fluid plunger within this chamber. An outer piston assembly includes a pair of outer pistons, one each operatively located in a respective one of the engine cylinders, with at least one pull rod connected between the outer pistons. The pull rod extends through an outer pumping chamber in the fluid pumping assembly and forms a fluid plunger within this chamber. The movement of the inner and outer piston assemblies during engine operation will cause the fluid plungers to pump fluid from a low pressure container into a high pressure chamber as a means of storing the energy output from the engine. A hydraulic coupler in communication with the pumping chambers will synchronize the motion of the inner and outer piston assemblies to assure that the pistons in the opposed cylinders are operating in opposition to one another.

A fire detection system for monitoring a volume containing fluid, typically air, for the presence of smoke particles is disclosed. A conduit for receiving the fluid, and any smoke particles therein, and directing the fluid to a smoke detector has a plurality of inlets formed therein. A respective temperature sensor is associated with each of the inlets which generate a signal indicative of a change in temperature in the region of the inlet. In the embodiments, the temperature sensor comprises one or more fibre Bragg gratings. The fibre Bragg gratings preferably have different grating periods. The reflected light from each fibre Bragg grating is returned back down the fibre optic cable and redirected via a 2×1 coupler to a wavelength detection system and a personal computer. The combination of wavelength detection system and personal computer allow analysis of the reflected light patterns, as well as providing a user interface which enables detection of the occurrence of a spatial and/or a temperature variation. The location of the said variation along the fibre optic cable is advantageously detectable. The system described is highly sensitive to smoke, but can advantageously also provide an indication of the location of the smoke source, because any variation in temperature at any one of the smoke inlets is also detected, the location of the sensor being known.

Drift generated at the time of photographing a TEM image is corrected simultaneously with photographing, so that a TEM image free form influence of drift is photographed. While the TEM image is recorded, drift in the place out of the view field subjected to recording is measured from moment to moment by another TV camera or a position sensitive detector. Drift is corrected by the movement of the specimen due to a specimen holder or by the movement of the image due to an image shift coil.

A microscopic projection or a characteristic pattern are formed in the vicinity of a region to be processed before processing using electron beam CVD, during processing an image of a region containing the projection or pattern formed by electron beam CVD is captured to obtain a current position of the projection or pattern, a difference between the position before staring and the current position is treated as a drift amount and processing is restarted at a region that has been subjected to microscopic adjustment of the electron irradiation region.

The invention relates to a top drive type drilling machine system based on dynamic control of a tool surface of an underground drilling tool and a well drilling method. The drilling machine system comprises a dynamic control system and a well drilling system, wherein the dynamic control system comprises a dynamic measuring subsystem, a feedback control subsystem, a user interaction subsystem and an execution subsystem; a user inputs drilling tool information, well drilling fluid information, stratum information and a control strategy through the user interaction subsystem; a many-body dynamics model of a well drilling system is established by the feedback control subsystem according to the received drilling tool information, well drilling fluid information and stratum information; various information of the well drilling system in a well drilling process is measured by the dynamic measuring subsystem and is transferred to the feedback control subsystem; and the feedback control subsystem judges whether the tool surface of the underground drilling tool exceeds a set threshold value or not, calculates the required rotating angle of a top drive, the position of a traveling block and the pumping speed of a slurry pump in a many-body dynamics simulating manner, and drives the top drive, the traveling block and the slurry pump to run. The top drive type drilling machine system continues drilling until the tool surface of the underground drilling tool returns to a design position, and dynamic adjustment control on the tool surface of the underground drilling tool is finished.

The invention provides a multi-sensor integrated navigation method for a downhole vehicle, which comprises the following steps: acquiring first Bluetooth tag information, MEMS inertial navigation information, PAD map information and mileage information in a first area; determining whether the first Bluetooth tag information is valid; if not, fusing the MEMS inertial navigation information and themileage information to generate first position information; and interacting the first position information with the PAD map information to generate navigation prompt information. The Bluetooth/MEMS inertial navigation system/odometer integrated navigation is used to provide position and velocity information for the vehicle, through information fusion of the Bluetooth tag information, the MEMS inertial navigation information and the mileage information, navigation information is provided for the vehicle, which can obtain positioning and navigation accuracy far superior to that of a single sensor. The multi-sensor integrated navigation method for the downhole vehicle solves the problem that the distance in the signal area is indistinguishable, and when the distance between the two stations is too long and there is no signal in the middle, the positioning can not be carried out.

Positive charges of a sensor element are stored in a capacitor for converting a voltage, are converted into a positive voltage by an amplifier, and then are outputted. When the polarity of the charges of the sensor element are inverted to the negative, the charges inversely flow from the capacitor for converting the voltage and feed back to an equivalent capacitor of the sensor element, and an output of the amplifier reduces and returns to a zero-point, an automatic correcting circuit makes an FET conductive and the charges are discharged in order to prevent the fluctuation of the zero-point level due to the negative drift.

A reference surface is used to develop an empirical plot between a parameter of interest, such as roughness or modulation, and the position of the reference mirror in an interferometer by repeating measurements of the reference surface at different positions of the reference mirror so as to identify the in-focus position of the reference mirror. Serial quality-control measurements of samples of interest are carried out with the reference mirror in such in-focus position until a predetermined quality-control event triggers an automated system re-calibration by re-measuring the reference surface and, if the result does not correspond to the in-focus position of the reference mirror according to the plot, by finding a new in-focus position for the reference mirror using the same plot or, alternatively, a new similarly produced plot. Sample measurements are then resumed with the mirror placed at that new position.

The invention discloses a drift correction device for a datum line and a method thereof, which are used for correcting the drift of the datum line. The correction device comprises a differentiator for differencing a data signal to generate a differential signal, a computation module coupled with the differentiator for calculating the data signal on the basis of the differential signal to generate a computation signal, a capture module coupled with the computation module for determining the first critical value and the second critical value according to the computation module, a comparison module coupled with the capture module for comparing the computation signal respectively based on the first critical value and the second critical value so as to generate the first processing signal and the second processing signal, and a latch module coupled with the comparison module for latching the first processing signal and the second processing signal to generate an output signal. The device and the method of the invention can be used for correcting the datum line drift which is caused by a transmitter/a receiver in a wireless delivery system.

A scanning probe microscope has a cantilever having: a probe that is to be contacted or approached on a surface of a sample; and a processor that operates to perform a process including: calculating a measurement width MW and an offset value OV from a minimum value S_min and a maximum value S_max of a signal indicating a displacement of the cantilever with the following Equations (1) and (2) when a prescanning operation is performed before the measurement data is acquired by the probe microscope controller; and adjusting at least one of the offset value OV and the measurement width MW based on a temporal variation of the signal at the same position on the surface of the sample when the prescanning operation is performed.

MW=(S_max−S_min)  Equation (1)

OV=(MW/2)+S_min  Equation (2)

The invention discloses a tunnel-crossing rapid satellite alignment method and system for vehicle-mounted communication in motion. The method comprises the following steps of: detecting the number ofGPS effective satellites, when it is detected that the number of the GPS effective satellites is suddenly reduced, sending a 'kick reduction' signal, switching an antenna control mode from AGC beaconlevel tracking to inertial navigation locking, controlling the orientation of the antenna to be aligned with the direction of the satellite before the number of GPS effective satellites is suddenly reduced, and locking the pitch angle and the polarization angle of the antenna to be angles before the number of the GPS effective satellites is suddenly reduced; when it is detected that the number ofthe effective GPS satellites is increased suddenly, sending a 'kick increasing' signal, and switching the antenna control mode from inertial navigation locking to AGC beacon level tracking. Accordingto the method, the blank that the vehicle-mounted 'communication in motion' system does not have a rapid satellite alignment strategy when passing through a tunnel is filled, and the sensitivity andpracticability of the vehicle-mounted 'communication in motion' system in a multi-tunnel mountain area section are improved.

The present invention relates to a photon counting detector comprising a first direct conversion layer (10) comprising a low-absorption direct conversion material (11) for converting impinging high-energy electromagnetic radiation (100) into a first count signal and first electrical contacts (12), a second direct conversion layer (20) comprising a high-absorption direct conversion material (21) for converting impinging high-energy electromagnetic radiation (100) into a second count signal and second electrical contacts (22), said high-absorption direct conversion material having a higher absorption than said low-absorption direct conversion material, and a carrier layer (30, 30a, 30b) comprising first and second terminals (31, 32) in contact with the first and second electrical contacts and processing circuitry (35) configured to correct, based on the first count signal, the second count signal for errors, wherein said first direct conversion layer and the second direct conversion layer are arranged such that the high-energy electromagnetic radiation transmits the first direct conversion layer before it hits the second direct conversion layer.