33results about How to "Large measurable range" patented technology

The invention belongs to the fields of high-voltage live-line safe work construction safety monitoring and wireless communication, and discloses a distance measuring and alarming method for potential approaching work of a crane lifting car. The method is characterized in that based on distance measurement, information wireless transmission and data fusion, the real-time accurate measurement of the distance from construction personnel and equipment to a charged body and safety alarming are realized, accidents such as an electric shock caused by close contact with the charged body are prevented, serious safety accidents such as property loss and personnel casualties are prevented, the level of construction safety is simultaneously increased, the maintenance efficiency is substantially improved, and the construction safety is enhanced. The distance measuring and alarming method for the potential approaching work of the crane lifting car is used for high-voltage live-line safe work construction safety monitoring, and measurement without blind angles is realized by multi-angle ultrasonic sensors; a WiFi hot spot wireless network is flexibly installed; in addition, a control room can obtain construction on-site information at any time, a distance measuring and safety alarming system is formed, and the safety distance measuring problem of high-voltage live-line safe work construction is fundamentally solved.

The invention discloses a three-dimensional displacement measuring sensor based on a polymer optical fiber, and is used for measuring displacements in three directions. The three-dimensional displacement measuring sensor comprises an X-axis direction, a Y-axis direction and a Z-axis direction, and each direction corresponds to a passive optical fiber. The passive optical fibers in the three directions are both twisted with the active optical fibers to form twisted fibers, and respective one section of each of the twisted fibers in three directions are fixed to the X-axis direction moving plate, the Y-axis direction moving plate and the Z-axis direction moving plate respectively, and the remaining parts are bent into a circle to form three macrobend coupling structures respectively. The macrobend coupling structure can couple the light in the active fiber into each passive fiber, so that the optical power meter corresponding to the end of the passive fibers can detect the light intensity. The increase in displacement of the moving plates in three directions reduces the bend radius of each macrobend coupling structure, so that the active optical fibers can couple more light to the passive optical fibers, the three optical power meters can detect the changes of light intensity, and the changes of displacement in three directions can be measured by converting the light intensity into a displacement.

This invention relates to sugar content real time test method micro processor by impulse excitation signal by 50 to 10kH to test sugar liquid or sugar content with different of test object content with different resistance and voltages to get sugar content. This invention method is free from biological electrical field attuning change impact by use of random measurement method to exert different frequency impulse signals to improve test accuracy.

The invention discloses a test device for heat exchange tubes, comprising: a fixing mechanism, the fixing mechanism includes: a fixing frame, a first fixing seat and a second fixing seat, a first clamping component and a second clamping component; a balance component, It is used to connect two heat exchange tubes; the preload loading mechanism includes two preload loading units, each preload loading unit acts on a heat exchange tube respectively, and the two preload loading units are respectively arranged on the opposite side of the balance assembly. In the present invention, a rotating pair is formed between the slide rail and the first sliding block, which unloads the pre-tightening force generated when the heat exchange tube is tightened, so that the test experiment can be carried out smoothly; at the same time, the two heating tubes are fixedly clamped, and the The balance component is set between the heat exchange tubes, which avoids the interference of the force generated by the heat exchange tubes during the preloading of the test, and greatly reduces the error of the experiment.

The invention discloses a clamping device and a fixing mechanism of a heat exchange tube, comprising: a first clamping assembly, used to clamp one end of the heat exchange tube; a second clamping assembly, used to fix the other end of the heat exchange tube ; the fixed frame; the first fixed seat and the second fixed seat, the first fixed seat and the second fixed seat respectively fix a first clamping assembly; the sliding seat, which is arranged on the fixed frame; the balance assembly, Used to connect two heat exchange tubes. In the present invention, in the clamping device, a rotating pair is formed between the slide rail and the first sliding block, which unloads the pre-tightening force generated when the heat exchange tube is tightened, so that the test experiment can be carried out smoothly; in the fixing mechanism, at the same time The two heat exchange tubes are fixedly clamped, and a balance assembly is set between the two heat exchange tubes, which avoids the interference of the force generated by the heat exchange tubes when they are pre-tightened on the experiment, and greatly reduces the error of the experiment.

The invention relates to an automatic testing method and system for DNS monitoring service. The method comprises the steps of step 1 designating IP and ports of the to-be-tested services and to-be-tested DNS server, step 2, according to test use cases, differentiating different test scenarios and writing test use case files, step 3, according to use case files, writing configuration files of monitoring items to designate the monitoring scenarios to each use case, step 4, according to the configuration files of each use case, writing the corresponding anticipated result files, step 5, through an automatic test procedure, running the test use cases one by one, sending query packages to the to-be-tested DNS server, comparing feedback results with the anticipated results, step 6, after all the use cases are run, generating a test report based on the comparison results obtained in step 5. The automatic testing method and system for DNS monitoring service can save the cost of manual test, reduce the risks of manual mistakes, and achieve the fast, reliable and automatic tests of DNS monitoring service system.

The invention relates to a fiber Bragg grating force sense sensor, a robot and a sensing measurement method of the robot. The fiber Bragg grating force sense sensor comprises a body; at least one inscription groove and optical fibers arranged in the inscription grooves are arranged on the surface of the body; inscription is performed on the optical fibers according to preset fiber Bragg grating parameters, so that at least one fiber Bragg grating can be formed; when the body is deformed under the action of an external force, the change amount of the preset fiber Bragg grating parameters and the change of the center wavelength of the fiber Bragg gratings are obtained; and the change amount of a preset measurement coefficient can be obtained according to the obtained change amount of the preset fiber Bragg grating parameters and change of the center wavelength of the fiber Bragg gratings. Since the fiber Bragg grating force sense sensor of the invention is based on optical fiber sensing, the defect of high possibility of being subjected to electric interference and electromagnetic interference of a traditional sensor can be eliminated. The fiber Bragg grating force sense sensor has the advantages of heat resistance, corrosion resistance and radiation resistance of an optical fiber sensor, small size, high precision and wide measurement range, and can meet the requirements of the static and dynamic characteristics of the feet, fingers and the like of the robot and bear large enough impact load.

The invention discloses an underwater detection method for coordinated formation of unmanned ships. The method specifically includes the following main processes: establish a grid map based on environmental information, conduct area coverage data detection after the unmanned ships are formed, search for the nearest uncovered area and plan a path when they fall into a blind spot or the round of coverage ends Arrive in this area to continue the task; at the same time, each unmanned ship has an obstacle avoidance function and a solution when the unmanned ship encounters obstacles. The invention uses a small unmanned ship for detection, which can pass freely in shallow water areas; the invention uses the unmanned ship formation method for detection, which can detect from different angles and overcome the misjudgment caused by the single unmanned ship itself and the angle limitation of the ultrasonic probe ; The present invention uses surface and underwater ultrasonic probes, and the range of obstacle avoidance is not limited to obstacles on the water surface, but also can detect underwater obstacles to avoid collisions caused by underwater reefs; when an unmanned ship breaks down suddenly, other The unmanned ship can re-plan to continue the mission.

The invention discloses a coplanarity measuring system based on the projection Moire principle, which comprises a cold light source (1), a collimating lens (3), CCD (charge coupled device) cameras (2, 4), an LCD (liquid crystal display) panel (5), a projection lens (6), an optical platform (7), a high-precision mobile station (8) and a computer (9), wherein the LCD panel (5) displays a strip pattern generated by the computer (9); the light emitted by the cold light source (1) is irradiated on the LCD panel (5) after passing through the collimating lens (3); the strip pattern displayed on the LCD panel (5) is projected to the surface of a reference plane or an object loaded to be measured on the high-precision mobile station (8); and two CCD cameras are symmetrically arranged at two sides of the LCD panel (5). The measuring area and the measuring precision of the coplanarity measuring system are increased, which can meet the demand of large-area, high-precision, quick and real-time measurement in current encapsulation test.

The present application proposes a device and method for testing the refractive index of an optical waveguide group. The device includes: a plurality of microring test components, each of which includes a straight waveguide and a rounded rectangular waveguide, and the rounded rectangular waveguide Parallel to the straight waveguide and close to one side of the straight waveguide to form a directional coupler with the straight waveguide, the rounded rectangular waveguide is perpendicular to at least one side of the straight waveguide to set the waveguide to be tested, and the plurality of microrings The waveguides to be tested in the test components have different lengths, and the multiple microring test components are the same except for the waveguides to be tested in different lengths. The invention has the advantages of high testing precision, wide measurable range and the like.

The invention provides a thickness measurement device of a scrubbing machine; and the device is high in accuracy and working efficiency. The invention also provides the scrubbing machine provided with the thickness measurement device. The scrubbing machine comprises a programmable logic controller (PLC), a brush roll, a brush roll fixing seat, a brush roll motor, a pressure adjusting box, a servo motor, a pressure regulating screw rod and the thickness measurement device, wherein the brush roll is driven to rotate by the brush roll motor; the servo motor can be used for adjusting the position of the brush roll fixing seat by controlling the threaded connection height between the pressure regulating screw rod and the pressure adjusting box; the thickness measurement device mainly comprises a thickness measurement rotating shaft, a thickness measurement rubber roll, a rotary encoder, a big synchronizing wheel and a small synchronizing wheel; when a base plate enters the position between the thickness measurement rubber roll and a lower carrier roller, the big synchronizing wheel and the small synchronizing wheel are driven to rotate by the thickness measurement rotating shaft; the rotary encoder connected with the small synchronizing wheel is used for transmitting the spin data into the PLC; the PLC is used for controlling the rotating speed of the servo motor and the brush roll motor. The scrubbing machine and the thickness measurement device of the scrubbing machine are applied to the processing field of a circuit board.