40results about How to "Reduce measurement blind spots" patented technology

The invention relates to a cable fault simulating and positioning system. The cable fault simulating and positioning system comprises a cable fault simulation box, an electrode installing plate, three wire inlet electrodes and three wire outlet electrodes, wherein the electrode installing plate is installed in the cable fault simulation box. The three wire inlet electrodes are connected with three-phase cable cores in a wire inlet cable respectively, and the three wire outlet electrodes are connected with three-phase cable cores in a first wire outlet cable respectively. The cable fault simulation box is internally provided with a resistance box for simulating the break line, low resistance, high resistance and flashover fault between the wire inlet electrodes and the wire outlet electrodes, and the tail end of a second wire outlet cable connected with the wire outlet electrodes is provided with a high-voltage cable terminal. The high-voltage cable terminal is used for connecting a cable fault positioning detecting instrument. The cable fault positioning detecting instrument comprises a central control unit, an impulse transmission circuit, a reflecting receiving circuit and a high speed data collecting circuit, wherein the impulse transmission circuit is used for sending a pulse signal to a tested cable, the reflecting receiving circuit is used for receiving a reflecting signal of the tested signal, and the output end of the reflecting receiving circuit is connected with the input end of the high speed data collecting circuit.

The invention belongs to the technical field of electronic measurement and discloses a method for ultrasonic ranging and a system thereof. The ultrasonic ranging method comprises the following steps: a first threshold value is set; when the distance of the measured object is larger than the threshold value, a resonance operation mode is adopted to drive an ultrasonic probe; when the distance of the measured object is smaller than the threshold value, the driving signal frequency which is applied on the ultrasonic probe deviate from the resonance frequency of the signal. The invention also discloses an ultrasonic ranging system which adopts the method, comprising an ultrasonic probe, a microprocessor, a driver module, a signal acquisition module and a signal display module. Compared with the prior art, the invention can greatly reduce a measurement blind area from the known 40cm to below 10cm.

The invention relates to the field of level measurement and provides a system for processing an echo signal of a guided wave type radar level meter taking a single chip as the core. The system is composed of the single chip for controlling the sending and receiving of a pulse signal, a pulse emission circuit, a guided wave rod, an echo signal receiving circuit, an equivalent time sampling circuit, a signal adjusting circuit, a MSP430F5418 single chip system, a liquid crystal display and software. Specific to the material with big relative dielectric constant and the material with small relative dielectric constant, different methods for processing the echo signal are respectively adopted for restraining false echo interference, confirming and correcting a peak value of a real echo, and then fitting or interpolating nominal data, thereby realizing the level measurement.

Disclosed is a channel depth measuring method based on a chaotic laser device and a correlative method thereof. The depth of a channel in a shoal water area can be measured on the basis of the chaotic laser device. The method includes on a channel water surface carrier, allowing the chaotic laser device to emit probing light and reference light, allowing the probing light to emit to the water bottom of the channel perpendicularly, collecting reflected probing light signals through a telescope, and converting the probing light signals into electrical signals; converting the reference light into electrical signals through a photoelectric detector, after storing two paths of electrical signals, performing correlation calculation, acquiring the time for light signals flying for a round trip in the channel water, and acquiring the channel depth accordingly. By the aid of the method, the conflict between the distance resolution and measuring depth according to the existing laser radar technology for measuring the channel depth is solved, the distance resolution unit can be centimeter, and the advantage of interference resistance is provided.

The invention discloses a temperature field real-time monitoring device of an air-cooled condenser. The device comprises the following components: a collection device for collecting the temperature of the heat exchange tube wall at the air outlet position of each tube bundle; a controller connected to the signal of the collection device The output port is used to obtain the steam temperature in the corresponding tube bundle according to the temperature signal of the wall surface of the air outlet, and display the steam temperature in each tube on the interface of the display device; the display device displays the steam temperature in the tube of each tube bundle on the interface; Compared with the condensed water temperature at the outlet of the air-cooled condenser, this paper directly collects the wall temperature of the air outlet of each tube bundle of the air-cooled condenser, which greatly improves the accuracy of judging the temperature inside the tube bundle and reduces the temperature blind area. The monitoring of the internal temperature of the tube bundles and even the flat tubes is helpful for the staff to keep abreast of the working conditions of each tube bundle or flat tubes, avoid local overcooling of the air-cooled condenser, and further improve the reliability of the air-cooled condenser and improve the power generation efficiency of the power plant.

The invention discloses an electromagnetic ultrasonic transducer for measuring wall thickness of a test piece and a method for measuring the wall thickness of the test piece. The transducer comprises an upper shell, a lower shell which is abutted with the upper shell and comprises a secondary stepped hole at the bottom, an exciting plane coil which is arranged inside the deepest stepped hole at the bottom of the lower shell, a receiving plane coil which is arranged inside the deeper stepped hole at the bottom of the lower shell and coaxially laminated with the exciting plane coil, a shielding layer and a magnet element, which are sequentially arranged on the receiving plane coil, and a joint, which is arranged on the upper shell, respectively connected with the two plane coils through an insulated wire and used for being connected with a thickness meter so as to measure the wall thickness of the test piece. The two plane coils do not interfere with each other in a space so that the transducer has high exciting efficiency, high receiving sensitivity and high signal-to-noise ratio, and simultaneously, reduces a measuring blind zone by arrangement of the designed dual coils and other elements.

The invention relates to a method for measuring a water holding rate of a near-horizontal oil-water two-phase flow. A measuring device used by the method comprises a test pipe, an upstream fast-closing valve, a downstream fast-closing valve and an array of double-parallel line conductivity sensors. The two fast-closing valves are respectively arranged at two ends of the test pipe. The double-parallel line conductivity sensors are distributedly inserted into different cross sections of the test pipe. The test pipe is fixed in an experimental pipe. When a flow can stably flow, the upstream and downstream fast-closing valves are fast closed, after the oil-water two-phase flow in the pipe to be detected is layered through standing, the double-parallel line conductivity sensors in the oil-waterinterface carry out acquisition and processing of signals so that height hw of water layers at the double-parallel line conductivity sensor positions and sensor position parameters n are obtained, and a water holding rate is calculated through the hw and n.

The invention provides an electromagnetic ultrasonic thickness gauge for measuring the thickness of a specimen in a variety of abominable environments and a measurement method thereof. The electromagnetic ultrasonic thickness gauge is composed of a microcontroller, a transmitting circuit, an electromagnetic ultrasonic probe, a receiving switch, a conditioning circuit, an echo processing system, adisplay system and a keyboard, wherein the microcontroller is connected with the transmitting circuit which is connected with the electromagnetic ultrasonic probe, the electromagnetic ultrasonic probe is connected with the receiving switch which is connected with the microcontroller and the conditioning circuit, the conditioning circuit is connected with the echo processing system, and the display system is connected with the microcontroller which is connected with the keyboard. The electromagnetic ultrasonic thickness gauge uses a normal-incidence body wave to measure the thickness and achieves the measurement accuracy which is twice as high as that of piezoelectric ultrasonic thickness gauge at the same frequency. The electromagnetic ultrasonic probe which adopts a pulse electromagnet to offer magnetic field can effectively detect various metallic specimens; as a transceiving separated coil is used for exciting and detecting ultrasonic waves, the blind area for the measurement is small and the measurement thickness can be in a range from 3mm to 200mm.

The invention discloses an integrated electric contact liquid level and liquid temperature measurement sensor. An electric contact and phi2 armored thermocouple electrodes are adopted in the sensor. A plurality of armored thermocouple electrodes are longitudinally arranged on a metal framework and are arranged in a stainless steel protection sleeve integrally; and an electrode lead is led out from a bundle in an upper sealed end plug of the protection sleeve and connected with secondary meters such as a millivolt thermometer and an electric contact water level meter. The integrated electric contact liquid level and liquid temperature measurement sensor is inserted into a high-temperature and high-pressure container to directly measure a real liquid level and a real liquid temperature, so that the sensor is small in measurement error, high in resolution and assembled and used easily and has a compact structure. The sensor is used for measuring the liquid level and the liquid temperature of relevant high-temperature and high-pressure containers of a nuclear reactor, such as a reactor core, a spent fuel battery, a pressure stabilizer and a steam generator, and also can be used for measuring the liquid level and the liquid temperature of the conventional high-temperature and high-pressure containers.