57 results about "Tiltmeter" patented technology

Method and apparatus for monitoring growth of fracture during hydraulic fracturing treatment of a ground formation. A series of tiltmeters are positioned at spaced apart tiltmeter stations at which tilt changes due to hydraulic fracturing treatment are measurable by those tiltmeters. Tilt measurements obtained from the tiltmeters at progressive times during the fracture treatment are compared with estimated tilt changes estimated from an assumed hydraulic fracturing propagation. Useful values for initially undetermined values of parameters of the model are derived using an inverse procedure. The data analysis may be performed in real time as the hydraulic treatment progresses using differing propagation models to determine a most probable model.

The treatment well tiltmeter system comprises one or more tiltmeter assemblies which are located within an active treatment well. The treatment well tiltmeter system provides data from the downhole tiltmeters, and can be used to map hydraulic fracture growth or other subsurface processes from the collected downhole tilt data versus time. The system provides tilt data inversion of data from each of the treatment well tiltmeter assemblies, and provides isolation of data signals from noise associated with the treatment well environment. As well, the treatment well tiltmeter system provides geomechanical modeling for treatment well processes.

The invention discloses a system and a method for the monitoring and early warning of volcanoes based on an inclinometer and the GPS. The system includes a tilt measurement subsystem, a GPS monitoring subsystem and a ground control early warning subsystem. The tilt measurement subsystem is configured to obtain the ground tilt degree according to deformation of the tilt measurement subsystem caused by the deformation of a ground structure due to the magmatic pressure or mass redistribution so as to determine the small deformation of the volcano ground movement and to make early warnings; the GPS monitoring subsystem is used for obtaining the original observation data to determine ground displacement amount caused by the volcano to administer corresponding volcano movement state monitoring; and the ground control early warning subsystem is used for receiving tilt measurement data and the GPS data of the tilt measurement subsystem and GPS monitoring subsystem, for processing the data and for analyzing and obtaining the early warning data and for making an early warning signal according to the set early warning value so as to realize the detection of volcano state. The system and the method of the invention make the monitoring of volcanoes more accurate and ensure the reliability of data.

The invention relates to the field of sinking pipe calibration measurement, in particular to a high-precision inclinometer calibration method, comprising the steps of charging a segment, to be mounted, of a sinking pipe to a shallow dock area, mounting a hydrostatic level and a first inclinometer in the segment to be mounted, and using the hydrostatic level and the first inclinometer to acquire initial inclinations of the segment to be mounted; charging the segment to be mounted to a deep dock area, mounting a second inclinometer, and using the initial inclination of the segment measured by the hydrostatic level to calibrate the second inclinometer; after the second inclinometer is calibrated, comparing with the initial inclination acquired by the first inclinometer; after qualification is verified, mounting the segment on a bed. The invention is intended to provide the high-precision inclinometer calibration method having low external environmental impact, good measurement synchronism and small calibration error.

The invention discloses a method for obtaining the deflection of a dam body on the basis of measurement values of measured points of a limited inclinometer. Correlation vector regression with high generalization capability for small samples is adopted, measurement values of existing limited inclination angles are used as output variables, influencing factors such as coordinates of the measured points, the water level, the temperature, the pore pressure and the time are adopted as input variables, a correlation vector machine model is established, the tangent value of the inclination angle of an arbitrary spatial point on a measurement line at specific time is predicted, space coordinates are adopted for performing explicit optimal polynomial fitting on the tangent values of the inclinationangles on the measurement line, integration is performed on an optimal polynomial, and a tilt meter or the displacement measurement value of the top (such as an opening of an inclination measurementtube) of the measurement line of the inclinometer or the displacement measurement value of the bottom (such as the bottom of the inclination measurement tube) of the measurement line of the inclinometer is utilized to determine an integration constant, so that the horizontal displacement distribution (deflection) along the axis of an entire vertical inclination measurement hole is obtained. The measurement values of different time and space are simultaneously utilized, the influence factors such as external loads and the time and space are taken into account, and the method can be popularizedto other situations such as a slope, other projects of the slope and the horizontal layout of the measurement line.

A tiltmeter to measure a variation in inclination of a structure from a given starting position. The tiltmeter has two pots, each pot contains an identical volume and identical height of an identical liquid. A communication device connects the two pots and allows the liquid to flow between the two pots by the principle of communicating vessels. Two optical measuring devices are provided, one optical measuring device per pot. Each optical measuring device measures a variation in height of the level of liquid in the associated pot. The optical measuring devices are fiber optic devices coupled to a common light source.

The invention discloses a crustal inclination measurement device and method adopting a force balance feedback quartz horizontal pendulum. The crustal inclination measurement device comprises a bottom plate, wherein a tower-shaped quartz rack is fixed on the bottom plate. A quartz pendulum rod is suspended on the rack through two quartz suspension springs, and is at an approximately horizontal state. A pendulum bob is inserted and mounted at one end of the pendulum rod, and first and second parallel metal plates are respectively arranged on the two sides of the vertically arranged pendulum bob. The pendulum bob is parallel with the first and second parallel metal plates, so as to form a differential plate capacitor, wherein the pendulum bob serves as a moving plate, and the first and second parallel metal plates serve as static plates. The first and second parallel metal plates are connected with output terminals of a fixed direct current voltage generation unit and a sine waveform generation unit; the pendulum bob is connected with the input terminal of a crustal inclination measurement circuit; the output terminal of the crustal inclination measurement circuit is connected with the pendulum bob through a feedback unit. The crustal inclination measurement device can realize accurate measurement of crustal inclination angle when small inclination of the ground occurs, and a closed-loop feedback structure is constructed to solves problems in the existing quartz horizontal pendulum clinometers.

A spherical movable contact is housed in housing portions of a first case and a second case so as to be able to roll, and is to come into or go out of contact with a first fixed contact and a second fixed contact. The first case and the second case are fixed to each other so as to form an integral body in such a manner that the first fixed contact and the second fixed contact are opposed to each other. At least one of the first fixed contact and the second fixed contact is divided. The movable contact is disposed so as to roll while bridging the first fixed contact and the second fixed contact. Contact portions where the movable contact is to contact the first fixed contact and the second fixed contact assume arc shapes, respectively.