148results about How to "Eliminate the effects of measurement accuracy" patented technology

The invention discloses a dual-wavelength binocular vision seam tracking method. The method comprises the steps including image acquisition, data processing, seam tracking and the like. The invention further discloses a tracking system for implementing the method. The system adopts a near-infrared and structured light dual-wavelength binocular vision sensing system, images of a molten pool and different wavelengths of seam area images with of seams are measured simultaneously and transmitted to a miniature industrial control computer, and the seam positions are measured accurately with a multi-information fusion algorithm and a seam image three-dimensional reconstruction algorithm; the miniature industrial control computer adopts the Kalman filter algorithm to perform optimal estimation on the seam tracking deviation state according to a seam position detection result, a servo driver drives a servo motor to move so as to control a 3-axis motion workbench to generate corresponding motion, a welding torch or a laser head is controlled for deviation correction, and the seams are tracked accurately. The system can eliminate hard light, splashing and electromagnetic interference on a welding site and improve the seam tracking accuracy and reliability.

The invention discloses a screw rotor type surface profile error measurement instrument. The screw rotor type surface profile error measurement instrument is characterized in that: a measured rotor is supported between a headstock center and a tailstock center, and the measured screw rotor is driven by rotary working platforms to rotate; and a movable working platform is arranged, a measurement unit is arranged on the movable working platform, a long grating sensor for detecting the position of the movable working platform is arranged in the measurement unit, and a laser displacement sensor is fixedly arranged on an electric rotary disk. According to the screw rotor type surface profile error measurement instrument disclosed by the invention, the original measurement data on the screw rotor type surface feature is acquired under the motion coordination of two rotary working platforms and a one-dimensional translation platform by using the laser displacement sensor, and the corresponding data treatment and coordinate conversion are performed, so that the screw rotor type surface profile error data can be obtained and the error assessment result is given; and the screw rotor type surface profile error measurement instrument is simple in structure and good in processing and assembling performance, and is capable of realizing the surface profile error measurement on various screw surfaces and compatibly equipping sensors of other types for precise measurement of other parameters.

The invention discloses a soil heavy metal pollution quantification testing system and the testing method, which is used to conduct quantification monitoring to medium and light heavy metal polluted soil. The quantification testing system of the invention comprises a laser, a beam splitter, a collecting optics lens, an optical fiber detector, optical fiber, a spectrograph, a laser dynamometer instrument and a computer. The quantification testing system of the invention normalizes the laser induction and plasma spectrum strength value of the trace element in soil standard sample into the strength value of injecting laser, and then utilized the linear relation between the normalized value and the element content to build calibrating plot, and finally utilizes the calibrating plot and the same normalization method to conduct quantitative detecting to the heavy metal element in the unknown soil sample.

The invention belongs to the technical field of optical precision measurement, and relates to a method for measuring super long focal length of a confocal combination lens and a device thereof. The method is as follows: firstly determining the focal position of a reference lens and the focal position of the combination of the measured lens and the reference lens according to the confocal focusing principle, measuring the distance delta between the two focal points and the distance d0 between the two lenses, and substituting the delta and the d0 into a formula to calculate the focal length value of the measured lens, a pupil filtering technique can also be used in the measurement to enhance the sensitivity of focal length measurement. The invention proposes that accurate focusing is realized by the characteristics that an object corresponds to the microscope objective focus when the confocal point responds to the maximum curve value, and extends the confocal microscopy principle to the super long focal length measurement field, and proposes the confocal focusing principle. The method combines the confocal focusing principle with the combination lens method, has the advantages of high measurement precision and strong anti-environment interference ability, and can be used for high-precision focal length measurement during the detection and assembly of the super-long focal length lens.

The invention discloses an essence explosion proof type liquid level height detecting device and aw method. The essence explosion proof type liquid level detecting device comprises a wavelength analyzer, an optical cable, and a fiber grating buoyancy drawing device, wherein the fiber grating buoyancy drawing device comprises a buoyancy pontoon, a fiber grating and a fixing end, the wavelength analyzer emits light wave with certain frequency range to the fiber grating through the optical cable and receives the light wave reflected back by the fiber grating, the reflected light is analyzed, and the liquid level height of the liquid to be detected is calculated. Compared with the prior art, the device and the method have the advantages that the detected point can have no power supply, the device can be widely applied to explosive and flammable environment or highfield powerful electromagnetic environment such as petrochemical industry, and the like, the detection in a long distance can be realized; meanwhile, the detection accuracy is high, the millimetre-sized accurate measurement can be realized; moreover, the device and the method can realize network interconnection to intensively monitor the liquid level height of a plurality of places.

The invention discloses an FBG (Fiber Bragg Grating) liquid level sensor and a preparation method thereof. The sensor comprises a metal base, pressure sensing membranes, two metal capillary tubes, optical fibers carved with two FBGs having different wavelengths, pins and a tail fiber sleeve, wherein the optical fibers penetrate into the two metal capillary tubes; an FBG is located in the first metal capillary tube; a sensing FBG is located between the two metal capillary tubes to form a structural unit; the pressure sensing membranes are fixed on the metal base, and an air cavity is formed between the pressure sensing membranes; the structural unit is located in the air cavity; the first metal capillary tube is located at the center of each pressure sensing membrane; the optical fibers are vertical to the plane where the pressure sensing membranes locate; the second tube capillary tube stretches out of the metal base and is positioned by the pins; and the tail fiber sleeve is fixed at the lower end of the metal base to be communicated with atmosphere. The metal capillary tubes are titanium tubes; and the metal base is made of stainless steel. The sensor can be applied to inflammable, explosive and strongly-corrosive liquid, and has the advantages of wide dynamic range, an FS with the precision of 0.5%, a linearity of 99.7%, electromagnetic interference resistance, easy reusability and the like.

The invention provides a method for measuring the scattering coefficient of a three-dimensional target, which is based on the multiple-input and multiple-output array technology, and the method synthesizes a large two-dimensional antenna array by controlling the antenna of the multiple-input and multiple-output array to accurately move on a one-dimensional platform, and then obtaining three-dimensional high resolution distribution of the scattering coefficient of the target by being combined with the pulse compressing technology in signal processing, thus realizing three-dimensional high resolution measurement to the scattering coefficient of the target. The method overcomes the defects of large calculation amount, approximate error, difficult application and complicated target and broadband signal of the method for calculating the scattering coefficient of the target on the basis of computational electromagnetics and the defects of low resolution and being incapable of measuring large targets in the method for measuring the scattering coefficient of the target in a microwave dark room. The method is applicable to the fields of target scattering property research, stealth material/aircraft design, and the like.

The invention relates to an NDIR gas sensor system. The NDIR gas sensor system comprises an infrared sensor unit, a microprocessor and a concentration display unit, wherein the microprocessor system is connected with the infrared sensor unit and the concentration display unit; a sampling air chamber can effectively prolong an optical path and can control the volume of the air chamber to facilitatethe miniaturization of the sensor. The potassium bromide (KBr) window piece is arranged to avoid corrosion of a pyroelectric detector, the service life of the sensor is prolonged, and the optical paths of the measuring channel and the reference channel are completely symmetrical, so that the structural design of the single light source dual-optical path can eliminate the influence of external factors such as light source shake, optical device pollution and the like on the measuring precision to a certain extent. The NDIR gas sensor system and the temperature and humidity compensation method thereof employ a GSO-BP neural network to perform temperature and humidity compensation to overcome the defects of the empirical formula compensation method and the circuit compensation method in the prior art and lead the compensation process to be simpler and more accurate, and therefore, the precision is high, the cost is low and the structure is small compared to the prior art.

The invention, which belongs to the technical field of electric field measurement, discloses a rotary optical electric field sensor and a method for measuring an electric field by the same. The sensoris composed of a laser diode driver, a laser diode, an optical electric field sensing head, a photoelectric detector, a signal processing system and a photoelectric rotational speed sensor. A metal sensing polar plate senses a to-be-measured electric field strength; an optical signal arrives at the photoelectric detector through the rotating optical electric field sensing head; the photoelectricrotational speed sensor measures the rotation speed of the sensing head; and an electrical signal outputted by the photoelectric detector and a rotating speed of the photoelectric rotational speed sensor are sent to the signal processing system respectively. In addition, according to the method for measuring an electric field, noises in a signal are filtered based on a Kalman filter algorithm; theprocessed signal is transmitted to the voltage signal processing unit to obtain an alternating-current component and a direct-current component by separation; and then a regulation amount and a to-be-measured electric field strength are obtained. According to the invention, influences on the sensor stability by factors like the light intensity and temperature as well as the influence on the sensor measurement precision by the charge drift can be eliminated; and the measurement precision is improved.

The invention discloses a double-shaft transmission lien tower inclination sensor, which comprises a housing and is characterized in that one end of the housing is connected with an installation base; a transmission circuit board and a sensor circuit board are disposed inside the space formed by the housing and the installation base; one end of a cable conductor passes through the other end of the housing and is connected to the transmission circuit board; and the other end of the cable conductor is connected with a data collector. The sensor provided by the invention is compact in structure and small in size, and has strong anti-electromagnetic interference capability; while working on site, solar sheets are used to supply power for the data collector; the sensor needs no power supply atordinary times, but when in need of a measurement, the data collector firstly supplies powder for the sensor and then a measurement command is issued for measuring, thus effectively reducing the power consumption. By the adoption of an MEMS device, two orthographic direction inclination angles can be simultaneously tested; in addition, the temperature compensation design of the transmission circuit board is carried out so as to eliminate the influence of temperature on measurement precision and enable the sensor to adapt to the influence of complex climatic conditions. Therefore, the sensor provided by the invention can be used to accomplish the automatic acquisition of tower inclination data.

The invention provides an integrated measurement system for indirectly measuring the oil consumption of vehicular fuel oil and aims at providing the integrated measurement system with the advantages of capabilities of continuously detecting and displaying remaining oil mass, a real-time oil consumption valve, total oil consumption and hundred-kilometer oil consumption rate of the vehicle and accuracy and reliability in measurement. The integrated measurement system disclosed by the invention is realized by the following technical scheme that an exciting source circuit of a signal conversion assembly (2) is used for preprocessing a current oil mass data signal acquired by a signal receiving assembly (3) through a computing center (4) and an oil mass sensor assembly (1) and then converting the received capacitance signal into a standard voltage signal or a current valve signal; the standard voltage signal or the current valve signal enters the computing center (4) through an input/output interface (5) and is sampled by an A/D (Analogue/Digital) converter in the computing center (4); meanwhile, an ECU (Electronic Control Unit) oil injection pulse signal is directly transmitted to a single chip microcomputer in the computing center; and the processed data are outputted to a display unit or uploaded to an upper computer by resolving program software.

The invention provides a device for measuring the output displacement of a magnetostrictive actuator. The device comprises a laser position adjusting device, a high-speed laser displacement sensor, a power supply, a digital display and the magnetostrictive actuator. The device for measuring the output displacement of the magnetostrictive actuator has the outstanding characteristics as follows: non-contact high-precision measurement of the output displacement of the magnetostrictive actuator can be realized; longitudinal positions of laser points emitted by the high-speed laser displacement sensor are adjusted precisely through adjustment of the longitudinal position of a longitudinal slider in the laser position adjusting device; horizontal positions of laser points emitted by the high-speed laser displacement sensor are adjusted precisely through adjustment of the horizontal position of a horizontal slider in the laser position adjusting device; influence of vibration generated in a displacement outputting process of the magnetostrictive actuator and vibration generated in the external environment on the measurement precision is eliminated effectively.

The invention provides a comprehensive measuring system for directly measuring the fuel oil quantity and oil consumption of vehicle fuel, and aims at providing the comprehensive measuring system with the advantages that the rest oil quantity, the real-time oil consumption value, the total oil consumption and the oil consumption rate per 100km of vehicles can be continuously detected and displayed, and the measurement of the fuel oil quantity and the oil consumption is precise and accurate. The comprehensive measuring system is realized through the technical scheme that an excitation source circuit of a signal conversion assembly (2) preprocesses the current oil quantity and consumption data signals collected by an oil quantity sensor assembly (1) and a consumption sensor assembly (11) through a calculation center (4) and a signal receiving assembly (3), received flow rate signals and capacitance signals are converted into standard voltage value signals or current value signals, then, the signals enter the calculation center (4) through an input and output interface (5), and the preprocessed signals are processed again, are sampled by an A/D (analog to digital) converter in the calculation center (4) and are then transmitted to a display unit or are uploaded to a host computer after being transmitted to a single chip microcomputer in the calculation center to be treated by calculation program software.

The invention discloses a self-evaporator liquid level measuring device based on a dual-pipe air blowing method. In the device, a first air blowing pipe (1), a second air blowing pipe (2) and a self-evaporator (9) are connected; the first air blowing pipe (1) and the second air blowing pipe (2) extend into the bottom of the self-evaporator (9); the height difference of the bottom ends of the first air blowing pipe (1) and the second air blowing pipe (2) is h2; a pipeline which is connected with the first air blowing pipe (1) is internally provided with a first air blower (3), a first separation tank (7) and a first differential pressure transmitter (5); a pipeline which is connected with the second air blowing pipe (2) is internally provided with a second air blower (4), a second separation tank (8) and a second differential pressure transmitter (6); and the first air blower (3), the second air blower (4) and an air source are connected. The self-evaporator liquid level measuring device provided by the invention is widely applied to an aluminum oxide plant, thus pollution is reduced effectively, the plant environment is protected, and better working environment is created for workers.

The invention discloses a novel dynamometer. The novel dynamometer comprises a front vertical plate, the rear side of which is provided with a rear vertical plate matched with the front vertical plate. The front vertical plate and the rear vertical plate are localized by positioning pins, and are connected together. An opening is formed between the front vertical plate and the rear vertical plate, and a brake is erected on the opening. The brake is erected between the front vertical plate and the rear vertical plate by a rotating shaft. The brake comprises a rotor disposed on the outer part of the rotating shaft in a sleeved way, and a stator matched with the rotor is disposed on the outer part of the rotor in a sleeved way. The front end of the rotor is fixedly provided with a rotor end cover. The rotor end cover is connected with a rotor cup, and the rotor cup is disposed on the outer part of the rotor. One end of the rotating shaft is extended out of the front vertical plate in a penetrating way, and the other end is disposed in the rear vertical plate. The end of the rotating shaft disposed in the rear vertical plate is connected with a code disc. The novel dynamometer is advantageous in that heat dissipation performance is better, and operation is more stable; during the operation of the dynamometer, hot air is led to the outside the first time, and a rapid cooling effect is achieved, and therefore the stable and normal operation of the dynamometer is guaranteed.

The invention discloses a system for monitoring suspended solids in water in real time. The system comprises a multi-beam suspended solid concentration monitor and terminal monitoring equipment used for receiving data, wherein the multi-beam suspended solid concentration monitor projects measured light to a water sample to be detected, detects the intensity of light transmitting the water sample to be detected and measures the concentration of the suspended solids in the detected water sample according to the intensity; the multi-beam suspended solid concentration monitor comprises a first light transmitter, a second light transmitter, a first photoelectric detector and a second photoelectric detector; the two light transmitter alternately transmit the measured light; when each light transmitter transmits the measured light, the two photoelectric detectors simultaneously detect the intensity of the light transmitting from the detected water sample and form a digital signal to enter a data processing center according to the intensity of the light detected by the photoelectric detectors; and the data processing center calculates the concentration of the suspended solids in the detected water sample according to the digital signal and transmits the concentration of the suspended solids to the terminal monitoring equipment through a third-generation (3G) communication module.

The invention discloses a method for calibrating and compensating the fine code error of an encoding type sun sensor. The method comprises the following steps: calculating optical diffraction error of the fine code of the encoding type sun sensor and building a uniform mathematical model of fine code compensation for the encoding type sun sensor; building an error calibrating system and obtaining data of calibrating points under all angles of the encoding type sun sensor; then respectively substituting the data of the calibrating points into the mathematical model to obtain a parameter value of the mathematical model, and encapsulating the mathematical model after the parameter is determined into an inner processor of the encoding type sun sensor; and outputting measuring angles after compensating the fine code error in time under any measuring angle by the encoding type sun sensor. By virtue of the method, the problem that the measurement error of the encoding type sun sensor regularly changes in a sine mode along with the angles can be solved; the constant error of the encoding type sun sensor system can be effectively improved; the encoding type sun sensor can be simply mounted; and the calibrating efficiency of the system is improved.

The invention relates to a shift measuring device of the concrete temperature-stress tester, which comprises two suits of same measuring sub system distributed on the two sides of the central axis of the concrete test unit (1), each sub system is formed by a laser shift sensor (5) and a carbon fiber rod (3) parallels to the central axis; one end of the carbon fiber rod is fixed on the main rim of the tester by fixed seat (2) and the other end fixes a laser shift sensor; the rod is supported by a plurality of guiding seats (4) of the main rim; the laser (7) sent by the laser shift sensor is parallel to the test central axis; the laser returns to when it sends to the measuring point (8) of the active end; the digital quantity is transmitted to the upper machine or the display unit to process by the digital interface (6).

Based on printed circuit board (PCB), coil with air core of forcipated duplex winding is composed of cascaded PCBs end to end. Length of each PCB is designed based on shape of conducting wire to be measured. Each PCB possesses same thickness and width. There are two parallel sets of electric distribution formed own loop symmetrical to up and down along midline on each PCB so as to structure two pieces of winding. Directions of two electric loops in up and down windings are opposite. Symmetric distribution of windings can reduce interference from external electromagnetic field effectively. Advantages are: flexible changeable form, small size, not necessary to disconnect conducting wire to be measured when installation, and suitable to conducting wire to be measured in irregular figure. Comparing with structure of current coil with air core. The invented coil possesses more even magnetic field, higher accuracy measured, and higher capability of anti electromagnetic interference.