88results about How to "Solve the measurement accuracy" patented technology

A sensor resistance measurer consists of a power module, a keyboard module, a display module, a testing voltage source, a to-be-measured sensor, an operational amplifier, a feedback network, a polarity processing module, an A / D (analog / digital) converter and a numerical value processor. At least two feedback units are connected in parallel to form the feedback network. A sensor resistance measuring method is realized by the aid of measurement initialization, A / D conversion, polarity processing, automatic gear control, automatic zero point calibration and sensor resistance calculating software. A method for obtaining high precise resistance values includes that an attenuation type feedback network of a conventional precise-resistance-value resistor is adopted in a measuring amplifier, so that precise equivalent feedback resistance with the quite high value is obtained. The sensor resistance measurer and the method have the advantages that a high-resistance-value nano sensor with the resistance value higher than 1 G ohm can be precisely measured, large-range dynamic high-precision measurement is realized, voltage added on a resistor of the sensor can be confirmed and can be set in an optional range, a user does not need to adjust the voltage, any special production process requirements are omitted, the sensor resistance measurer is suitable for batch production, and the like.

The invention discloses a self-adaptation compound feedback optical current transformer and a method for determining current and belongs to the field of electric system high-voltage circuit current measuring and controlling applications. The self-adaptation compound feedback optical current transformer comprises a magneto-optic sensing unit which is a double-ring compound magneto-optic sensing unit and N single-stage magneto-optic sensing units. The current transformer is formed by arranging an intelligent following-adjusting light source, optical splitters, front-mounted optical detectors, rear-mounted optical detectors, the magneto-optic sensing unit, collimators, polarizers and polarization analyzers according to an optical transmission optical path. Meanwhile, the invention provides a method for determining current. The compound sensing technology is adopted, and therefore the problem that because of time-varying parameters, the measurement precision of the optical current transformer is low is solved; the optical sensing loop close-loop negative feedback structure is adopted for eliminating random variations, caused by environment temperature, of light intensity on the background of the optical current transformer, and the measurement precision is further improved.

The invention relates to a device for measuring a return flow of L-shaped communicating pipe drilling liquid and a method for measuring a return flow of L-shaped communicating pipe drilling liquid. The device for measuring a return flow of L-shaped communicating pipe drilling liquid consists of an optical liquid level sensor, an L-shaped communicating pipe, a flare pipe, a communication pipe bracket, a signal conditioning and pre-processing device, a data acquiring unit, a client computer and a sound and light alarm device, wherein the pipeline of the flare pipe is provided with an L-shaped communicating pipe; the L-shaped communicating pipe and the flare pipe form a communicating vessel; the vertical position of the window of the L-shaped communicating pipe is positioned between a pipeline flange plate of the flare pipe and the lower edge of a return pipeline; the circumferential direction of the window of the L-shaped communicating pipe anticlockwise rotate between the extended lines of the return pipeline central line from the intersecting line of the return pipeline and the pipeline of the flare pipe; and the optical liquid level sensor is arranged on the L-shaped communicating pipe bracket. In the invention, the pre-warning time is early; the detection precision is high; workers at the drilling site have more sufficient time to close the well; and blowout accidents are effectively prevented.

The invention aims to provide a circuit and a method for measuring resistance of a variable resistor. The circuit comprises single-chip microcomputers, a capacitor, a to-be-tested variable resistor Rx and a standard resistor R1. One end of the capacitor C is connected with the single-chip microcomputer GP0, and the other end of the capacitor C is connected with the ground. One end of the standard resistor R1 is connected with one end of the capacitor C, and the other end of the standard resistor R1 is connected with the single-chip microcomputer GP1. One end of the to-be-tested variable resistor Rx is connected with the single-chip microcomputer GP2, and the other end of the to-be-tested variable resistor Rx is connected with the other end of the standard resistor R1. The other end of the to-be-tested variable resistor Rx is connected with the other end of the standard resistor R1. According to the invention, a charging time T1 of a charge and discharge loop of the standard resistor R1 and the capacitor C and a charging time T2 of a charge and discharge loop between the serially-connected to-be-tested variable resistor Rx and the standard resistor R1 and the capacitor C are measured, and the resistance of the to-be-tested variable resistor Rx is calculated through a mode of Rx=R1*(T2-T1) / T1. The method provided by the invention solves the contradiction between measurement precision and measurement time in the circuit for measuring the resistance of a variable resistor by measuring the charge and discharge time of a capacitor in the prior art, and can obtain a good measurement result for a small variable resistor.

The invention discloses a method for measuring a wire rope of a laying winch. The method comprises the following steps: discharging or retracting the wire rope by the winch, changing direction of the wire rope after the wire rope passes through a pulley of a measuring device, driving the pulley to rotate by the wire rope, and acquiring an output voltage signal of a tachogenerator through corresponding arrangement of a gear ring and the tachogenerator; enabling a linear transducer to generate periodic pulse current through corresponding arrangement of a spoke and the linear transducer; acquiring a tension output signal through a tension sensor on a mandrel; and calculating the speed, length and tension values for discharging and retracting the wire rope through the laying winch control device, and controlling the laying winch in real time to correct the discharging and retracting of the wire rope in time. The invention also discloses the measuring device used by the method, which guides the wire rope discharged by the laying winch according to a set direction so as to improve the measuring accuracy and response time of parameters of laying wire ropes; and the winch is not positioned on the central line of a laying operating line so as to effectively utilize space.

The invention belongs to the field of power equipment control technology, and relates to a measuring system and a measuring method for measuring the actuation time of a high-voltage breaker of a non-load transformer loop. The system comprises a high-voltage-side transformer, a low-voltage-side transformer and a single-chip microcomputer module. The control instruction output end of the single-chip microcomputer module is connected with a breaker drive circuit. The signal input end of the single-chip microcomputer module is connected with a disconnection detection circuit and a connection detection circuit. The disconnection detection circuit is connected with the high-voltage-side transformer via a high-voltage signal acquisition terminal. The connection detection circuit is connected with the high-voltage-side transformer and the low-voltage-side transformer respectively via the high-voltage signal acquisition terminal and a low-voltage signal acquisition terminal. According to the technical scheme of the invention, the connection time duration and the disconnection time duration of the high-voltage breaker in the non-load transformer loop in the high-voltage state can be accurately measured.

The invention discloses a zero-flux hall large-current sensor structure, which comprises an upper half part structure, a lower half part structure and a connecting part structure, wherein the connecting part structure comprises an upper installation plate and a lower installation plate, which are identical to each other, the upper half part structure comprises two superimposed aluminum plates, two ends of the aluminum plate on the upper part are respectively provided with a circular hole, the periphery of the aluminum plate on the lower part is provided with a plurality of tapping holes C corresponding to tapping holes A on an upper installation plate, the aluminum plate on the lower part and the two upper installation plates are fixed by adopting a screw to penetrate the tapping holes A and the tapping holes C, the lower half part structure comprises a U-shaped aluminum plate, the peripheries of two top ends of the U-shaped aluminum plate are respectively provided with tapping holes D, two top ends of the U-shaped aluminum plates and two lower installation plates are fixed by adopting a screw to penetrate tapping holes B and the tapping holes D, and the upper installation plates and lower installation plates are tightened through a bolt running through a hole on a suspension loop. Through the structural mode, by adjusting an intermediate connecting mechanism, the position of a magnetic core is very easy to adjust.

The invention discloses an array resistivity focusing system and method in a laboratory. The system involves a voltage-controlled current source, a focusing controller, a main transmitting electrode A<0>, shielding electrodes A<1>-A<n-1>, shielding electrodes A<1>'-A<n-1>' which are symmetrical to the shielding electrodes A<1>-A<n-1>, backflow electrodes A<n> and A<n>', two pairs of supervision electrodes M<1>, M<2> and M<1>', M<2>' arranged between A<0> and A<1> and between A<0> and A<1>'. According to the array resistivity focusing system and focusing method in the laboratory, a digital focusing synthesis method is adopted between the main transmitting electrode and the shielding electrodes, hardware focusing cascading is adopted between the shielding electrodes and the shielding electrodes, and the digital focusing and the hardware focusing are combined, so that the problem of inaccurate measurement precision caused by residual potential of pure hardware focusing is well solved. Meanwhile, the problem of small-signal measurement precision of a pure digital circuit is solved, and the complexity of pure digital focusing calculation is greatly simplified. The focusing controller can carry out corresponding addition or deletion according to the increase or decrease of the array electrodes so as to meet the requirements of the laboratory on detection depth and resolution, and isflexible and changeable; and the V-I design of the backflow electrodes can realize deeper-stratum detection according to experiment requirements.

The invention discloses a three-dimensional chemical industry park establishing method. According to the three-dimensional chemical industry park establishing method, three-dimensional information of a three-dimensional chemical industry park is obtained according to characteristics of a to-be-scanned target object by adopting different types of three-dimensional laser scanners, the contradiction between the scanning precision and the scanning speed is well solved, by utilizing the conversion relationship between the WGS-84 standard coordinate of the target and the coordinates measured by the three-dimensional laser scanners, three-dimensional data obtained by the three-dimensional laser scanners is conveniently converted into the WGS-84 standard coordinate system which is universal to the latest 2,000 coordinate system, so that the obtained data can be directly applied to engineering and management, and the three-dimensional chemical industry park establishing method conforms to the current GIS (geographic information system) technical standard, and has great application value.