152results about How to "Avoid temperature effects" patented technology

The invention belongs to the detection field, and relates to an ultrasonic wave flow rate detecting system and a detecting method, in particular to a high-precision fluid flow rate ultrasonic wave detecting system and a detecting method. The ultrasonic wave flow rate detecting system includes a system control part, a circuit part and an auxiliary device. The ultrasonic wave flow rate detecting method is characterized in that an improved time difference method is adopted for calculating the speed of a fluid; the delay window reception technique is adopted, and the influence of noise on the detection precision during detection is reduced through pulse width detection; and as the resolution of measuring time for the system is further improved through the adoption of the interpolation correlation method and the correlation coefficient judgment method, and reaches 1.25ns, the accuracy and the precision of the ultrasonic flow-meter are remarkably improved. The detecting system provided by the invention has the characteristics of small size, low power consumption, stable and reliable measurement and the like; the precision reaches 0.5; the sensitivity attains 0.3mm/s; and the system is suitable for measuring the flow rates and the flow velocities of various liquids in plastic or metal pipes with diameters being 25mm-8m.

This invention relates to a new fiber position monitoring method and its system. The system is characterized by the following: it uses single light fiber as large arrange distribution sensor fiber and gets the disturbing source physical characteristics according to the phase inversion of the interference signals and determines the detail positions of disturbing source according to the frequency spectrum of the interference signals. It uses the sensor fiber end and reflecting lens method to improves the system accuracy.

The invention relates to the building field. The invention relates to a construction method for a concrete filled steel tubular column, comprising the following steps that: a tube is filled with water at first, and then a tremie is put down to the bottom of a pile; concrete is poured into the steel tube by a hopper through the tremie, and a vibrating tamper which is attached to the outerwall of the tube performs concrete vibrating when placing is performed simultaneously; primary concrete placing is performed until the height is 3 to 5 meters on the upper side of a nozzle of the tremie, and the tremie is lifted and guaranteed that the embedding depth of the tremie in concrete is not less than 2 meters; secondary concrete placing is performed, and the vibrating tamper which is attached to the outside of the tube on the bottom layer is started; lifting and placing are repeated, and the concrete is placed to the top of the column; and laitance is removed. The construction method solves the problem of the separation phenomenon caused by overhigh concrete placing height, increases the compactness of the concrete, reduces the number of air bubbles, has small shrinkage clearance between the concrete and the steel tube, can well give play to the function of stress, is convenient in construction, is mechanized, and is simple and convenient in operation. Moreover, the quality can be guaranteed; the equipment is saved by 30 percent; the stability is strong; and 50 percent of raw steel materials and 35 percent of the concrete are saved when the steel tube and the concrete are under same stress, thereby the production cost is effectively reduced.

The invention discloses a full-automatic frost heaving meter which comprises a host loading frame (1), a freezing pressure chamber (2) and a high-low temperature cycle control system (3), a water level control system (4) and a computer (5). The freezing pressure chamber (2) is positioned on the host loading frame (1), the high-low temperature cycle control system (3) is connected with the freezing pressure chamber (2), the water level control system (4) is connected to the top of the freezing pressure chamber (2), and the computer (5) is connected with the water level control system (4), the host loading frame (1) and the high-low temperature cycle control system (3) and can be used for test control and acquisition. The full-automatic frost heaving meter can realize automatic control and acquisition of the test process, the requirement of high precision of test control in test can be effectively met by servo closed loop control, and the full-automatic frost heaving meter is high in stability and long in service life.

The present invention relates to a high-speed wax coating apparatus, which comprises a base paper pre-heating assembly for carrying out a pre-heating treatment on base paper before wax coating, a wax melting chamber assembly arranged on the rear portion of the base paper pre-heating assembly and holding a wax liquid for wax coating of the pre-heated base paper conducted to the chamber, a wax feeding assembly having a disk type structure, a wax rubbing roller arranged on the rear portion of the wax melting chamber assembly and used for avoiding wax liquid temperature reduction when contacting the paper surface wax liquid, and a cooling roller arranged on the rear portion of the wax rubbing roller, wherein the lower half portion of the wax feeding assembly is soaked into the wax melting chamber assembly and coats the wax liquid onto the base paper in a rotating manner, and the wax liquid coated on the base paper is cooled in a rapid cooling manner through the cooling roller. Compared with the apparatus in the prior art, the apparatus of the present invention can ensure the stability and the uniformity of the wide-width high-speed wax coating.

The invention discloses a tire tread mixture, a tire tread made from the tire tread mixture and a tire. The tire tread mixture is prepared from the following raw materials in parts by mass: 30 to 45 parts of natural rubber, 30 to 45 parts of emulsion polymerized butadiene styrene rubber, 10 to 30 parts of cis-butadiene rubber, 45 to 75 parts of carbon black, 15 to 30 parts of white carbon black, 1.2 to 3.6 parts of silane coupling agent, 3 to 5 parts of zinc oxide, 1 to 2 parts of stearic acid, 2 to 4 parts of anti-aging agent, 1 to 2 parts of protective wax, 1 to 2 parts of sulphur, 10 to 20 parts of aromatic hydrocarbon oil, 1 to 2 parts of accelerant, 1 to 3 parts of tackifier, 1 to 3 parts of dispersing agent and 2 to 10 parts of non-slip material. According to the product provided by the invention, the trafficability characteristic and safety on a wet road surface and a smooth ice surface are improved, a proper amount of white carbon black is used and the friction between the product and the ground is larger, so that the controllability and the safety of a vehicle on the wet road surface and the smooth ice surface are greatly improved, and meanwhile, the tire rolling resistance and heat generation in a common environment cannot be affected.

The invention provides a titration method and a titration apparatus applied to an analysis meter. The titration method is characterized in that the titration apparatus automatically selects and adjusts the concentration of a titration solution and/or the titration speed according to the real-time concentration of a to-be-measured solution until the titration end point is reached, and the to-be-measured index is calculated, wherein the titration apparatus comprises two or more mutually independent titration agent channels, and the agents at different concentrations are conveyed through different channels. According to the titration method and the titration apparatus provided by the invention, the titration scheme is adjusted according to the to-be-measured solutions at different concentrations, so that the effect of rapidly accurately titrating is achieved.

The present invention provides an optical sensor unit (10) for measuring gas concentration, comprising: sensor means (12, 13) and first thermal insulation means (14, 16) at least partially surrounding said sensor means (12, 13). The sensor means (12,13) includes at least one sensing layer (12) adapted to be irradiated with a predetermined radiation (100), and at least one gas-permeable layer (13) adjacent to one side of the at least one sensing layer (12) and adapted to pass gas, which concentration is to measured, through the gas-permeable layer (13) towards the at least one sensing layer (12). The optical sensor unit (10) is adapted to measure an optical response of the at least one sensing layer (12), which optical response depends on the gas concentration.

The invention belongs to the field of laser preheating auxiliary processing and particularly relates to a method for calibration of laser absorptivity of a metal material. The method comprises a step S1 of utilizing a thermocouple to measure a temperature value of a test point of a workpiece varying with time under laser radiation; a step S2 of establishing a heat source model of the workpiece, adopting the heat source model to perform a simulated test, and obtaining a temperature value of a corresponding point of the test point varying with time on the heat source model; a step S3 of adjusting a parameter of the laser absorptivity input into the heat source model; and a step S4 of causing simulated test results to undergo a non-linear error analysis with an actual measurement result respectively, wherein a laser absorptivity parameter corresponding to an obtained optimal result is the laser absorptivity of the metal material. According to the method, a high-precision calibration result can be obtained, the process is simple, a test device is easy to obtain, small in calculated amount and is not easily disturbed by external factors, and thus the method is particularly suitable for testing the laser absorptivity of the metal material.

A first arm member and a second arm member are provided. The first arm member is positioned between a cam and a valve body to oscillate in synchronism with the rotation of the cam. The second arm member changes the angle of the first arm member in accordance with the rotation angle of a control shaft. The temperature prevailing in the neighborhood of the control shaft and cam is detected. The rotation angle of the control shaft is corrected so as to avoid the influence of the detected temperature.

The invention relates to a using method of a pellet cooling exhaust gas recycling and utilizing system. A chain grate, a chain grate upper cover, an air bellow of the chain grate upper cover, a rotarykiln, a ring cooler, a ring cooler upper cover, an air bellow of the ring cooler upper cover, a cooling fan, a dry air blowing machine, a pipeline and a valve are included. The using method is characterized in that a third cold section upper cover and a fourth cold section upper cover of the ring cooler communicate with each other to form a cooling rear section upper cover, and the cooling rear section upper cover is connected with a cooling exhaust gas temperature adjustment system. The cooling exhaust gas temperature adjustment system includes an exhaust pipe I, an exhaust pipe II, an exhaust pipe III, a regulating valve I, a regulating valve II, a cooling exhaust gas returning main pipe, three cooling exhaust gas returning branch pipes and a regulating valve III. The using method has the advantages that exhaust gas of pellet cooling links is totally recycled and used, the heat loss is reduced, the energy consumption of the system is reduced, the temperature adjustment means of theexhaust gas is provided, and hot airflow at the appropriate temperature is provided to the chain grate and the rotary kiln to serve as a heat source.

Disclosed is a micro-displacement sensor based on spherical optical fiber and Bragg grating cascade. An incident end single-mode optical fiber, the spherical optical fiber and a Bragg grating are serially connected to form the micro-displacement sensor, the diameter of the spherical optical fiber ranges from 160 micrometers to 180 micrometers, and the distance between the spherical optical fiber and the Bragg grating is shorter than 2cm. The micro-displacement sensor has the advantages that micro-displacement is measured by the aid of the micro-displacement sensor based on spherical structure and Bragg grating cascade, treatment such as corrosion and grinding needed by a traditional grating sensor is avoided, manufacturing difficulty and cost are reduced, micro-displacement measuring sensitivity is effectively improved by measuring the power of a reflection peak of a grating backward cladding mode, the sensor cannot be affected by temperature, stability is improved, and the micro-displacement sensor is compact in design, convenient to use and low in cost.

The invention provides a chip of a Z-direction sensitive quartz vibration beam accelerometer based on a quartz on silicon (QoS) technology, a processing technology and an accelerometer. The chip comprises a first quartz structure and a second quartz structure, wherein the first quartz structure and the second quartz structure are bonded on two sides of a silicon substrate structure; the quartz structures comprise quartz frames, two-end fixed quartz tuning forks, quartz supporting beams and quartz mas blocks; the silicon substrate structure comprises a silicon substrate frame and a silicon massblock; a sandwich form of the first quartz structure, the silicon substrate structure and the second quartz structure is formed and completely bonded at the quartz frame and the silicon substrate frame and the quartz mass block and the silicon mass block; and the processing technology comprises the steps that firstly, initial processing of the silicon substrate is carried out, then double-surfacebonding of the silicon substrate and two quartz pieces is carried out, the two quartz pieces are subjected to thinning and polishing, then quartz vibration beam electrodes and the quartz structures are manufactured, and finally the silicon substrate structure is released. The chip of the Z-direction sensitive quartz vibration beam accelerometer has the characteristics that the sensitivity is high, the cost is low and the like.

The invention relates to an environment temperature compensation heavy current measurement system based on fiber polarization detection. Through carrying out real-time measurement on environment temperature, setting a polarization controller, and inputting an optical signal and a temperature signal in the polarization controller simultaneously, a temperature change signal is compensated in the polarization controller, thus the optical signal always maintains linear polarization at a controller output terminal (a fiber which detects current), influence of temperature change on polarization change of light is avoided, influence of the temperature change on a current detection result is avoided, and measurement accuracy of the system is raised. According to the invention, a structure is simple, a requirement of an insulation device is not high, compared with a traditional test system, a dimension becomes smaller, and cost is low. A magneto-optical effect principle is employed, thus a dynamic scope is very large, reaction rate is high, and a non-saturation test of heavy current can be realized. By employing the fiber as a sensor, long distance transmission of data can be realized, and security is raised greatly.

A sensor device including a source for electromagnetic radiation, a receiver and a control device, the control device being designed for emitting electromagnetic radiation by means of the source and for determining a distance that is covered by the electromagnetic radiation emitted by the source from a reflection surface of an object to the receiver, doing so by evaluating a propagation time of the radiation or a phase of an oscillation modulated onto the radiation. According to the invention, the control device provides an economy mode in which the power of the source is lower in a prescribed time interval by comparison with a normal object detection mode, means being provided to ensure switching back into the normal object detection mode in the event of a predefined object situation.

The invention relates to a preparation method of activated carbon with low ash content and high specific surface area. The preparation method comprises the following steps of: S1, selecting coal withash content lower than 8%, and grinding the coal to 200 meshes or below; S2, selecting shell carbonized materials, and crushing and grinding the shell carbonized materials into powder of 200 meshes orbelow; S3, premixing the coal and the shell carbonized materials in the steps S1 and S2 with an adhesive according to a mass ratio of 100: (10-100): (20-60) to form a premix; S4, uniformly mixing andkneading the premix under the condition of 45-120 DEG C, carrying out extrusion molding under the condition of 10-20MPa to form strips with the diameter of 4-12 mm, and airing the material strips; S5, carbonizing the aired material in a carbonizing furnace at the carbonizing temperature of 250-500 DEG C for 0.5-5 hours; and S6, activating the strongly carbonized material for 0.5-5 hours by utilizing water vapor at 800-1100 DEG C to obtain the activated carbon with low ash content and high specific surface area. The activated carbon prepared by the preparation method of activated carbon with low ash content and high specific surface area has the characteristics of low cost, high strength, low gray scale and high specific surface area.