216results about How to "Guaranteed measurement" patented technology

The invention discloses a river channel two-dimensional flow velocity and flow measuring system. The system comprises an acoustic Doppler current profiler, a mechanical rotation driving device, an embedded control and data acquisition device and a host computer, the host computer is connected with the embedded control and data acquisition device, the embedded control and data acquisition device isconnected with the mechanical rotation driving device, and the mechanical rotation driving device is connected with the acoustic Doppler current profiler. A river channel two-dimensional flow velocity and flow measuring method includes following steps: (a) flow velocity scanning; (b) flow velocity calculation; and (c) flow calculation. According to the system, the design of the combination of theunderwater mechanical rotation device and the acoustic Doppler current profiler is employed, conventional one-dimensional flow velocity profile data is extended to two-dimensional scanning flow velocity data, and the calculation fitting of the river channel flow is performed by employing a calculation model of fluid dynamics so that more accurate flow data is obtained, and the problem that the conventional measuring system cannot guarantee timeliness, accuracy and validity of measured flow data is solved.

The invention discloses a double-threshold CRAR and trace point condensation method suitable for a continuous wave radar, belongs to a signal processing technology, and specifically relates to a continuous wave radar target constant false alarm detection and distance-speed two-dimensional trace point condensation method. Aiming at the characteristics of a relatively small wave beam grazing angle and relatively high resolution ratio of a continuous wave perimeter monitoring radar, a false alarm probability formula for ordered statistics of CRAR after Weibull clutter is subjected to linear detection and a corresponding clutter parameter estimation method are given; aiming at the problem that traditional OS-CRAR needs ranking operation and is relatively large in time consumption, a method fordouble-threshold CFAR is proposed, the number of times of statistical ranking is greatly reduced, and through addition of GO logic, running time is further reduced, and performance in clutter edges is improved; and joint realization of CRAR detection and trace point condensation is proposed, correct pairing of upper and lower frequency sweeping in subsequent processing of the continuous wave radar is guaranteed, and compared with traditional serial operation, computational complexity is greatly reduced.

The invention discloses a measurement method and a measurement instrument of a revolution body part, wherein the measurement instrument comprises a base, a vertical post and an optical measurement head, wherein the vertical post is fixed on the base; the optical measurement head is movably assembled on the vertical post through a vertical orientation mode; a working platform which is used for placing and revolving a part is correspondingly arranged on the base below the optical measurement head; the working platform comprises a revolution platform and an angle displacement regulating platform which are arranged from bottom to top; the angle displacement regulating platform comprises a first angle displacement platform and a second angle displacement platform which respectively comprise a first deflection platform and a second deflection platform; and the deflection axes surrounded by the first deflection platform and the second deflection platform in rotation are vertical mutually and are both parallel to a plane of a light curtain of the optical measurement head. For the angle displacement regulating platform in the measurement instrument provided by the invention, by adopting the deflection surrounding the deflection axes parallel to the plane of the light curtain of a parallel light source through driving the two angle displacement platforms respectively by the revolution driving mechanism, the cross coupling regulation of the deflection angles of the working platform is realized, the space posture of a workpiece can be captured accurately, and the accurate positioning and measurement to the part are ensured.

The invention relates to the rib-expansible density logging while drilling apparatus for use in the petroleum drilling industry. A density detector pup joint and a gamma radioactive source are sealed and arranged on a drill collar. An expandable rib is arranged on the surface of the drill collar at position of a groove, and the groove and the density detector pup joint are arranged at an interval of about 120 degrees in a circumferential direction. The expandable rib relies on a piston assembly to extend outward under the action of pressure drop (difference between inner pressure and outer pressure) generated due to instruments such as a drill bit (and a motor) arranged at the lower part of the apparatus and presses the detector pup joint against a well wall on a corresponding side by using counterforce of the well wall to realize density measurement by the well wall. And when a pump stops, the expandable rib retracts under the action of a return spring. The rib-expansible density logging while drilling apparatus is applicable to various wells, ensures measurement by the well wall, overcomes influence of slurry, mud cake or complex well structure on measurement precision, improves underground safety and is applicable to logging while drilling and geosteering drilling.

The invention discloses a magnetic measurement positioning device, which comprises a packaging shell, wherein side guide wheels are respectively arranged on the upper portion and the lower portion of the packaging shell along the axial direction, a first three-dimensional fluxgate sensor is arranged on the upper portion of the packaging shell, a second three-dimensional fluxgate sensor is arranged on the lower portion of the packaging shell, the first and the second three-dimensional fluxgate sensors are respectively connected with signal collecting modules through wires, the signal collecting modules are connected with power supply and signal transmission cables which extend outside the packaging shell, and the distance between the first and the second three-dimensional fluxgate sensors is kept in constant. The invention provides the magnetic measurement positioning device and a method for monitoring slope deep displacement by utilizing the magnetic measurement positioning device can solve the problems that displacement values which meet monitoring accuracy requirement can not be calculated and more sensors are used, guarantee measurement accuracy of deep displacement, greatly reduce system cost, and is convenient in popularization and application.

The invention discloses a system and a method for the high-precision measurement direction sensing and rotary positioning of relative micro-rotation between two planes. Two gratings are arranged on the two planes to form two groups of measurement grating pairs. When the amount of relative rotation between the two planes is zero, grid lines of all gratings are in the same direction. Two groups of measurement grating pairs are opposite in the size relation of grating size but identical in period ratio. The number of fringes acquired by a measurement system is not less than 40. The method for measurement direction sensing and rotary positioning comprises the following steps of adopting the dimensions of fringe inclination angles obtained in the horizontal-vertical direction and two diagonal directions to obtain the directions of the fringe inclination angles. When two groups of interference fringes are identical in direction, rotary zero-point positioning is realized between the two planes, and when two groups of interference fringes are different in direction, relative rotation amount exists between the two planes.

A method is disclosed for the temperature stabilization of a direct-converting X-ray detector, including a detector surface having a semiconductor and being divided into a plurality of partial detector surfaces. During the irradiation of the detector surface, heat is generated in the semiconductor by electric power. Electric power generated in the semiconductor is kept constant for each partial detector surface at least during a heterogeneous and/or temporally variable irradiation of the detector surface by feeding-in power-adjusted additional radiation for each partial detector surface. A direct-converting X-ray detector is disclosed for the detection of X-rays. At least one control loop with at least one reference variable is embodied for the energy regulation of the additional radiation, which keeps the temperature in the semiconductor constant for each partial detector surface by keeping the electric power in the semiconductor constant by changing the energy of the additional radiation. A CT system is disclosed.

The invention relates to a sodium-void reactivity measurement method for a sodium-cooled fast reactor. The method comprises the following steps: (I), a measurement position is selected in a reactor core; (II) a sodium coolant for fuel components of the reactor core exists in the measurement position in the step (I) in a normal operation state, the reactor is adjusted to a tiny super-critical state, the state parameter of the reactor core, the rod positions of all control rods and counting and reactivity data of a neutron detector are recorded, and the super-critical reactivity Rho1 of a reference point is calculated in a fitting manner; (III) shutdown is performed, the sodium-void experimental assembly without the sodium coolant replaces fuel components in the step (II) when the counting drops to the background, and the super-critical reactivity Rho2 of a measurement point is obtained by adopting the method of the step (II); (IV) the measured value of the sodium-void reactivity is equal to (Rho1-Rho2); and (V) the measured value is subject to various modifications. The invention also provides a sodium-void experimental assembly used in the method. By adopting the method and the assembly which are provided by the invention, more accurate sodium-void reactivity value can be obtained.

The invention relates to a conjunction box without power loss during replacement, and belongs to high-supply high-metering and high-supply low-metering electric energy metering devices. Electricity is metered normally when the metering device as a collection terminal and an electric energy meter is replaced, and the conjunction box is prevented from power loss when a secondary loop is powered off transiently. The conjunction box is characterized in that a voltage loop connecting part is provided, four holes are formed in a T-shaped copper tube at the voltage wire inlet end at the bottom of the conjunction box, each of two linear copper tubes is provided with three holes at the wire outlet end in the upper portion of the conjunction box, the wire outlet end is connected with the T-shaped copper tube at the wire inlet end by cooperating two separate loops with two connection sheets respectively, and power supply of one voltage loop is not influenced when the connection sheet, cooperating with the other voltage loop, is disconnected. The conjunction box provided by the invention can be used to ensure that the electricity is metered normally in the wiring process of instruments during onsite examination.

The invention discloses a method for detecting and solving anomaly of metering chips. The method includes steps of (1), powering up the metering chips and writing standard parameters into the metering chips; (2), keeping time periods N; (3), carrying out detection, to be more specific, a, detecting the frequencies of power grids, b, detecting voltages of the power grids, and c, detecting power; (4), enabling a chip managing MCU (micro-control unit) to read parameters of the metering chips when the time periods N are up, returning to the step (2) if the parameters are consistent with the standard parameters, enabling the chip managing MCU to initialize the metering chips if the parameters are not consistent with the standard parameters and returning to the step (2). The method has the advantages that the anomaly of the metering chips can be detected by the aid of the method, the metering chips can be recovered by the aid of the method, and accordingly the reliability and the stability of meters can be effectively improved.

The invention discloses an optical vector analysis method based on chirping intensity modulation. The method comprises the following steps: using a chirping intensity modulation light double-sidebandsignal as detection light to irradiate a to-be-detected optical device, and converting an optical signal into an electric signal by photoelectric detection; changing the phase difference between the double-sideband signal and the optical carriers to obtain detection optical signals of different chirping intensity modulation states, then establishing an equation set by using the relationship between the amplitude information of the electric signals obtained by the detection optical signals of different chirping intensity modulation states and the detection optical signals, and solving to obtainamplitude response of the to-be-detected optical device. The invention further discloses an optical vector analysis apparatus based on chirping intensity modulation. By adoption of the optical vectoranalysis method and apparatus, complex and relatively narrowband single side band modulation or carrier frequency shift is avoided while realizing high precision measurement of the amplitude responseof the optical device, the measurement range is doubled, the measurement errors caused by vestigial sideband are eliminated, the filtering mechanism in the system is eliminated, and the cost and thecomplexity of the system are greatly reduced.

The invention belongs to the field of machinery technology, and relates to an eight-axis turntable for electromagnetic window testing. The turntable comprises a rolling ring assembly, a pitching assembly, an upward-and-downward linear assembly, a forward-and-backward linear assembly and a direction assembly. The turntable realizes transverse rolling rotary movement, pitching rotary movement, upward-and-downward elevating movement, frontward-and-backward translational movement and rotation movement of an electromagnetic window product, and realizes transverse rolling rotary movement, pitching rotary movement and rotation movement of a signal source. According to the eight-axis turntable, always perpendicularity between a tangential plane of a random point arm surface of the tested electromagnetic window product and the axis of the emitting surface of the signal source is ensured through eight-axis combined movement; and furthermore a fact that the emitting position of the signal source is always at the circle center of a fixed area arc surface on the tested electromagnetic window product is realized. The eight-axis turntable has advantages of performing real-time compensation on the angle and position error in measurement through eight-axis linkage, realizing accurate measurement and automatic measurement, and more accurately realizing electric performance testing on the electromagnetic window product with large eccentric moment and large dimension.

The invention relates to a capacitive radio-frequency admittance level transmitter and an operating method thereof. A high-frequency sinusoidal excitation signal output by a high-frequency driver is loaded into a capacitance sensor; through analyzing the sizes of an AC (alternating current) component and a DC (direct current) component of a response signal of the capacitance sensor, the impedance and condensance of the capacitance sensor are calculated through the operation of an MCU (micro-programmed control unit); and the condensance of an attachment is obtained through backstepping according to a conclusion that in a radio-frequency admittance theory, a real part and an imaginary part which are subjected to equivalent admittance by the attachment are numerically equal, so that the real capacitance is equal to a value obtained by subtracting the attachment capacitance from the measured capacitance, thereby eliminating the measurement errors of the attachment caused by that a measured medium is adhered to an electrode, solving the difficult problem that the measurement errors of viscous measured materials or solid powdered measured materials are large, improving the measurement precision, and guaranteeing the measurement stability.

The invention discloses a time delay detection system for a signal circuit. According to the time delay detection system, a first microprogrammed control unit controls a signal generator to generate two paths of signals; one path of signal is inputted to a second comparator directly, and the other path of signal passes through a measured signal circuit and is inputted to a first comparator; the two paths of signals which are outputted by the two comparators are inputted to a complex programmable logic device (CPLD); the output of the CPLD is connected to a second microprogrammed control unit; and the second microprogrammed control unit (MCU) 2 is connected with a thin film transistor (TFT) touch screen and a secure digital (SD) card for storing information. In a CPLD time delay detection unit, a dual-input time difference measuring method is adopted in the measured signal circuit, so that the measurement of a broadband signal can be ensured; the frequencies and amplitudes of the signals generated by the signal generator can be adjusted; and the signals with different frequencies can meet different measuring requirements, and the signal time delay characteristics of different signal unit circuits can be measured. According to the time delay detection system, time delay characteristic curves of different signal circuits within a certain frequency range can be measured, and can be stored to the SD card to be inquired historically and conveniently.

The invention provides a signal channel sending method, a base station, a storage medium and an electronic device, and the method comprises the steps: configuring a signal channel which is used for cell searching, synchronization and measurement; and sending the signal channel to a terminal. According to the invention, the technical problem that the discovery signal cannot be fairly sent in the prior art is solved.

The invention discloses a novel multi-platform-surface dynamic weighing system. The novel multi-platform-surface dynamic weighing system comprises a vehicle separator, a tire identifier, a scale body, signal acquisition equipment, signal processing equipment, a first scale platform, a second scale platform and a third scale platform, wherein the first scale platform, the second scale platform and the third scale platform are sequentially arranged abreast along the driving direction; the vehicle separator is used for separating vehicles; the tire identifier is arranged in front of the first scale platform or behind the third scale platform, and the vehicles pass through the tire identifier and the vehicle separator. Due to the adoption of the structure in which the three scale platforms are arranged abreast, the length of the three-scale-platform weighing system is increased compared with a single-scale-platform weighing system and a double-scale-platform weighing system, the staying time of the vehicles on the scale platforms is prolonged, and the influence on weighing errors caused by non-standard vehicle passing behaviors such as S-type passing of the vehicles, jumping of the vehicles over the scale platforms and high-speed passing of the vehicles through the scale platforms can be eliminated.

The invention discloses a method for measuring a soil soluble organic carbon isotope. In the method, an EA-IRMS method is adopted. The method comprises the following steps: firstly, extracting soil water-soluble organic carbon through a multi-water to soil mass ratio method to obtain a solution containing the soil water-soluble organic carbon; then, concentrating the obtained solution through freeze drying; adding purified water into concentrated substances for re-dissolving, drying and measuring delta<13>C through EA-IRMS. The novel method for measuring the soil soluble organic carbon isotope provided by the invention is rapid and efficient, is easy and convenient to operate, and has high measuring accuracy.

The invention discloses an installation structure of a radar level meter on a sewage tank of an alumina plant, which comprises the radar level meter (1), wherein the radar level meter (1) is installed on a tank cover (3) of the sewage tank (4) through an installation joint pipe (2), a connecting joint pipe (5) is additionally arranged between the installation joint pipe (2) and the tank cover (3), and a ring-shaped steel plate (6) is arranged between the installation joint pipe (2) and the connecting joint pipe (5). The installation structure avoids that the radar level meter is immersed in rainwater, prevents the sewage in the sewage tank from splashing owing to stirring to corrode a bell mouth of the radar level meter, and simultaneously guarantees the effective measurement for the liquid level of the sewage tank by the radar level meter. The installation structure is outstanding in effect, simple in structure, convenient in installation, easy in implementation and worthy of popularization and application.

Provided are a channel measurement method for large-scale antennas, and a user terminal. The method comprises: pre-dividing antennas at a base station side into more than two groups, and a user terminal receiving pilot signals which are sent by different antennas in the same group at the base station side by adopting a frequency division manner and antennas in different groups by adopting a time division manner; and using the received pilot signals of some groups of antennas to conduct airspace channel estimation, so as to obtain channel measurement results of all the antennas. The present invention can ensure the integrity of channel measurement while reducing the pilot overhead. In addition, the user terminal has no need to conduct airspace channel estimation after waiting to receive the pilot signals of all groups of antennas, thereby reducing the time delay of channel parameter feedback.