46results about How to "Flexible measurement methods" patented technology

This invention disclosed a three-dimension measurement method which consists of preparation, picture intussusception, coding spot identification, camera location confirmation, target curve pick-up, homonymic curve matching and target curve reconstruction. It has the following characteristics: mark on the target curve before measuring to make the picture identification much more easy; place a guage and a set of coding spots around the target object; screen randomly to obtain a set of image by the camera; calculate automatically the position and gesture of the camera according to the images; pick up the marked curve and match the homonymic curve in different images so that the information of three-dimensional spot line was automatically calculated.

The invention provides a variable-focus monocular and binocular vision sensing device comprising a mirror image type optical system, a high-precision bearing holder, an image acquisition system, a digital information processing device and other parts. The variable-focus monocular and binocular vision sensing device can guarantee that a variable-focus image sensor (a CCD (Charge Coupled Device) or an analog video camera) mounted on the high-precision bearing holder can be accurately located at a certain required monocular vision preset station, and can automatically regulate the focus to the required value so as to perform monocular vision measurement or guidance work; the variable-focus monocular and binocular vision sensing device also can accurately locate the image sensor at the unique determined binocular vision preset station, and can automatically regulate focus to the required value, and thus, the image sensor and the mirror image type optical system jointly form a binocular vision sensing system, and sequentially, the function of binocular vision guidance or measurement is realized; and moreover, the variable-focus monocular and binocular vision sensing device can realize automatic switching between a monocular vision station and a binocular vision station through programming of the digital information processing device according to the task requirements, so as to realize the functions such as monocular and binocular vision measurement, guidance or obstacle avoidance.

The invention discloses a multiple stumpage breast height diameter passive measurement method based on a depth extraction model. The multiple stumpage breast height diameter passive measurement methodbased on the depth extraction model comprises the following steps: step 1, calibrating a mobile phone camera, and obtaining camera internal parameters and an image resolution; step 2, establishing adepth extraction model (which is as shown in the specification); step 3, collecting and processing an image of a stumpage to be measured, and calculating a stumpage depth value in a photogrammetric coordinate system; and step 4, measuring multiple stumpage breast height diameter values in a single image (the formula is shown in the specification). The multiple stumpage breast height diameter passive measurement method based on the monocular vision and the depth extraction model disclosed by the invention can be applied to cameras with different parameters such as field of view, focal length, image resolution and the like, which improves range accuracy and measurement efficiency, and provides a support to forestry resource surveys and forestry resource management.

Disclosed are a method and a device for measuring contact heat transfer coefficient on the solid interface. The method comprises connecting heating bar 12, the first sample 13, thin slice 14, the second sample 15, cold-trim bar 9, centring steel ball 16, pressure device 3 in sequence; adding corresponding thin slice 14 between the contacting surface of the two samples; increasing the number of contacting surface and enlarging temperature difference of the contacting surface; connecting the input terminals of thermal couple 4 and temperature control meter 5, and parallel the output terminal of the temperature control meter 5 with the industrial control machine 7 via the RS232 converter; heating the heating bar 12 with the heating stove 11, adding an asbestos heat insulating layer 10 around the sample to insulate heat; the industrial control machine 7 collecting temperature signal via the temperature control meter 5, displaying and analyzing.

The invention provides an automatic detecting and positioning device of a laser spot focus. A photoelectric detector (4) of the device detects a laser spot focused by a focusing lens (13) from a spotincidence hole of a spot detecting face (5) to obtain signals, the signals are sent by a signal sending line (3) to a central processing unit (1) connected with the signal sending line, and the central processing unit (1) sends a movement instruction to an X-directional, Y-directional and Z-directional stepping motor connected with the central processing unit (1) through a signal receiving line (3) according to spot signal data changes until the spot detecting face (5) moves to the laser focus. By means of the automatic detecting and positioning device, feedback adjustment is conducted on theposition of the spot detecting face through a horizontal movement table control module, the automatic search of the position of the laser focus is realized, the precise setting of a to-be-detected sample can be realized, and the scanning and imaging of a tiny spot can be realized through a filtering image reconstruction module. The automatic detecting and positioning device is suitable for a supervacuum closed space and has the remarkable advantages of being easy to operate, flexible in measurement method, simple in system framework, low in construction cost and the like.

A micro-nano scale coupling vibration high-resolution measurement method is provided. The method based on an atomic force microscope (AFM) imaging technology is characterized by, to begin with, enabling a passivated AFM probe to contact with the smooth surface of a sample on a scanner, driving the scanner to drive the sample to perform X-axis-direction reciprocating scanning movement through a high-voltage driver, and utilizing a photoelectric detector to synchronously detect a Z-axis-direction deflection process of the AFM probe, so that micro-nano scale high-resolution measurement of Z-axis-direction coupling vibration of the scanner due to the X-axis-direction movement of the scanner is realized.

The invention belongs to the technical field of sensors, and provides a joint angle measuring method and a joint angle measuring system. For the joint angle measuring device and the joint angle measuring method, micro attitude sensors are adopted. The attitude sensors are fixed to the limb at two ends of a movable joint in a pasting manner or in a manner adopting a bandage, and the limb movement attitude result measured by the attitude sensors is converted into the movement angle of the joint through a specific mathematical relation. The invention aims at providing the measuring mode which islow in cost, is flexible, and is free of the limitation of site requirements, with the measuring mode, the measurement precision in the prior art is improved, the user experience is promoted, and theproblems that the precision is poor and the device is expensive in the prior art are solved.

The invention relates to a power transmission and distribution measuring system based on an unmanned plane technology and a measuring method thereof. The system comprises a high-voltage circuit timely collection assembly, a monitoring assembly and an electric power company electricity consumption information collection system, wherein the high-voltage circuit timely collection assembly comprises an unmanned plane, and a current sensor and a network transmission module which are hung by the unmanned plane, the current sensor is used for collecting current data of a high-voltage circuit, and the network transmission module is used for being remotely connected with the monitoring assembly; and the monitoring assembly is used for being connected with the network transmission module of the high-voltage circuit timely collection assembly, being remotely connected with the electric power company electricity consumption information collection system and carrying out data processing and comparison on the received data information after the connection with the high-voltage circuit timely collection assembly and the electric power company electricity consumption information collection system. According to the invention, the data measured on the line is synchronized, converted and returned to an earth station for comparison, processing and analysis, whether the high-voltage current and a current practically used by a user end are abnormal is discovered, and alarming is carried out if an abnormity is discovered.

A micro-nano scale dynamic coupling vibration single-point tracking measurement method is provided. To begin with, under the condition that an AFM probe does not contact with the surface of a flat scanner, a piezoelectric scanner is driven to drive the probe to perform X-direction reciprocating scanning motion with a certain frequency and amplitude, and Z-direction deflection of the probe is recorded in real time so as to obtain a Z-direction vibration mode of the piezoelectric scanner; then, the probe is enabled to contact with the surface of the flat scanner through automatic probe entering process and scanner fine tuning, the flat scanner is controlled to be in synchronous movement with the probe in X direction and the Z-direction deflection of the probe is recorded so as to obtain a synchronous movement vibration mode of the piezoelectric scanner and the flat scanner; and at last, the recorded synchronous movement vibration mode and the vibration mode of the piezoelectric scanner are subtracted so that a Z-direction coupling vibration mode of the flat scanner at a certain position due to X-direction movement can be obtained.

The invention discloses an aviation structural member digitization grinding method based on a joint arm measuring apparatus. The aviation structural member digitization grinding method comprises the following steps: Step 1, a measuring scheme is planned, the appearance features of a semifinished product piece are analyzed, a scanning scheme is drawn, and the relative position of the joint arm measuring apparatus and a to-be-measured semifinished product piece is determined; Step 2, initialization operation before data acquisition is carried out; Step 3, according to the measuring scheme planned in the Step 1, the actual appearance point cloud of the to-be-measured semifinished product piece is obtained; the joint arm is utilized to scan the outer surface of the to-be-measured semifinished product piece in a combustion box through the point cloud data acquisition software so as to obtain the actual appearance point cloud of the to-be-measured semifinished product piece; Step 4, models are compared to conclude evaluation results of grinding allowances; Step 5, the processing path of a robot is planned; according to the grinding allowances of all parts of the to-be-measured semifinished product piece obtained in the Step 4, the grinding feed amount of each feed for grinding the robot is controlled, the processing path is planned, and the actual grinding process is guided. According to the invention, the aviation structural member digitization grinding method has the following characteristics: the grinding efficiency is improved, the measurement error is small, the measurement way is flexible, the scanning accuracy is high, the size is small, the weight is light, and the usage mode is flexible.

The invention discloses a grinding amount analysis method based on a grinding wheel end face grinding steel rail. The grinding amount analysis method comprises the steps that firstly, measuring pointsare arranged in the longitudinal direction of the steel rail before grinding, and the profile of the steel rail at each measuring point is measured; the profile of the steel rail before polishing isreconstructed, and further the profile of the steel rail at each measurement point after reconstruction is obtained; and then the steel rail is ground for multiple times, and the grinding amount of the steel rail under the corresponding working condition can be conveniently and accurately calculated by measuring the profile of the steel rail before grinding and the grinding marks after grinding for each time and combining a certain data processing algorithm. Grinding amount parameters of the polishing equipment under different working conditions can be accurately mastered, effective guidance is formed for on-site polishing operation, and the polishing quality is guaranteed.

The invention discloses a digital camera-based three-dimensional measurement method of a shoe tree. The three-dimensional measurement method comprises the following steps: step 1, shoe tree wiring, namely wiring is performed as per the characteristics determining the geometry of the shoe tree, and a target curve needing to be rebuilt is marked to serve as a mark curve; step 2, image taking, namely, the shoe tree marked by the digital camera is taken from different angles to obtain a plurality of images; step 3, image characteristic curve obtaining, namely the lines of mark curves of the shoe tree in various images are subjected to image processing to extract the frameworks of the mark curves, and the frameworks are fit by utilizing an improved snake model so as to obtain the image characteristic curves; and step 4, three-dimensional rebuilding of the image characteristic curves namely, a three-dimensional characteristic curve is obtained and is fit into a three-dimensional shoe tree model. Compared with a conventional method, the digital camera-based three-dimensional measurement method has the advantages of simple measurement hardware, low price, flexible measurement method, and can perform three-dimensional rebuilding of the characteristic curves under the condition that part of image curves is lost or blocked.

The invention relates to a thickness gauge with replaceable probes and a test method. The thickness gauge comprises a mechanical scale, a digital display gaugehead, a scale slide block, a movable U-shaped probe, a fixed U-shaped probe, a needle-shaped probe, a measuring pedestal and a positioning device. The scale slide block is arranged on the mechanical scale. The measuring pedestal and the positioning device are fixed to the two ends of the mechanical scale respectively. The digital display gaugehead is fixed to the scale slide block. In this way, the thickness gauge is formed. The thickness gauge matches the movable U-shaped probe, the fixed U-shaped probe and the needle-shaped probe to meet requirements in different measuring environments. Measuring modes are flexible and changeable. The thickness gauge can measure thickness or depth in different conditions and different positions, such as the thickness of window glass with a window frame, the thickness of a door leaf with a door frame, the thickness of glass on a door leaf, the thickness of a girder web, the thickness of a sheet material with the coarsely cut edge, the thickness of a surface coating, the depth of a slit or a hole. The thickness gauge is simple in structure and low in cost, people can easily learn to use the thickness gauge, and flexible and changeable application methods are provided.

The invention discloses a film material thermophysical property measurement system and method based on fluorescent lifetime. The film material thermophysical property measurement system comprises a detection light source, a heating light source, a photon detector, a time-correlated single photon counter and a calculation unit; the detection light source is used for irradiating a film sample so asto fluorescently excite the film sample; the heating light source is used for irradiating the film sample so as to instantaneously heat the film sample; the photo detector is used for detecting a fluorescent signal of fluorescence excitation; the time-correlated single photon counter is connected with the photo detector by virtue of the signal and used for recording a single photon signal of the fluorescence excitation; and the calculation unit is connected with the time-correlated single photon counter by virtue of the signal and used for calculating thermophysical properties of the film sample according to the single photon signal recorded by the time-correlated single photon counter. The film material thermophysical property measurement system is simple and easy in operation, flexible in measurement way, higher in sensitivity, applicable to the fields such as biology and medicine, capable of ensuring the biological activity, and capable of measuring the thermophysical properties under the small temperature disturbance.

The invention discloses a dimension measurement tool for structure in a joint and with a virtual rotation center. The dimension measurement tool for the structure in the joint and with the virtual rotation center comprises a right component, a left component, an arc rail, a right handle and a left handle, wherein the right component and the left component are connected into a scissor structure through the arc rail, the right handle is connected with the right component, and the left handle is connected with the left component. Tow patulous measurement tips are used to perform cross obstacle measurement on the dimension of the structure in the joint. The virtual rotation center of the dimension measurement tool can guarantee that the diameter of the measurement tips at an incision position of the joint is the minimum, and thereby reduces pain of patients, and improves operation measuring safety. According to the dimension measurement tool for the structure in the joint and with the virtual rotation center, a measurement range is enlarged through a measurement mode of crossing a left slide rod and a right slide rod, the distance between the tips of the left slide rod and the right slide rod can be accurately figured out by using the arc rail and readings of a left slide rail and a right slide rail, and the distance figured out is the structure dimension of a measured object in the joint.

The invention discloses a device for measuring the displacement of an object in a paramagnetic box based on a magnetic mark, and the device comprises a magnetic shielding room, a gantry type measurement rack, the magnetic mark, a first measurement system, and a second measurement system. The gantry type measurement rack is disposed in the magnetic shielding room, and the interior of the gantry type measurement rack is provided with the paramagnetic box containing the measured object. The magnetic mark is fixed at a part, nearest to the internal surface of the paramagnetic box, of the measured object, and is magnetized in a possible displacement direction of the measurement object. The first measurement system is used for recording the magnetic field changes before and after the placement of the measured object and the magnetic field change after the measured object moves. The second measurement system is used for carrying out corresponding one-dimensional coordinate calibration when the first measurement system records the magnetic field changes. The device achieves the no-damage detection of the displacement of the object in a paramagnetic metal or nonmetal box, is higher in detection depth, is lower in error, causes no damage to materials and human bodies, and is suitable for popularization and application.

The invention discloses a rapid measurement device and method for spurious suppression of communication comprehensive test equipment, and belongs to the technical field of testing. The rapid measurement method for spurious suppression of the communication comprehensive test equipment provided by the invention has a function of selecting two measurement modes of measurement speed priority and measurement quality priority, and a more flexible measurement method is provided for different test scenes; secondly, the measurement process is dynamically adjusted and automatically memorized, the optimal test parameters of the current measurement equipment can be obtained and stored in a local database for direct use next time, the automation degree is higher, and the measurement efficiency is higher.

The invention discloses a full-polarization radar-based ice cover internal fabric and ice flow field distribution feature identification method; a second order fabric orientation tensor and a dielectric constant tensor in an ice cover inner ice crystal have a correlation relation; the method uses a layer-by-layer recurrence method to solve the dielectric constant tensor and a corresponding rotating angle of each reflection layer in the ice cover according to full-polarization radar echo signals, thus further calculating an ice fabric second order orientation tensor feature value and identifying the fabric type, and extracting the ice flow direction and spatial distribution feature information thereof according to the fabric, stress deform and ice flow correlation relations. The identification method is fast, effective, lossless and low in invest cost, and the radar detection measuring mode is flexible and large in a measuring scope; the full-polarization radar measurement can be used to fast obtain the large scale ice cover internal fabric and the ice flow field spatial distribution information.

The present invention provides a movable threshing cleaning test stand. The test stand comprises a rack, a front-end cutting table, a walking chassis positioned below the rack, as well as a threshing cylinder, a grass stirring wheel, a grass comminuting device, a cleaning mechanism, a control cabinet, a monitoring system and wireless communication device equipment which are arranged above the rack; wherein the threshing cylinder is arranged at an output end of the front-end cutting table; a cleaning chamber is arranged below the threshing cylinder; the cleaning mechanism comprises a vibrating screen and a blower which are positioned below the threshing cylinder; the grass stirring wheel is arranged between the threshing cylinder and the grass comminuting device, and is used for sending straw output by the threshing cylinder to the grass comminuting device; the control cabinet is connected with a computer terminal through the wireless communication equipment; the monitoring system is connected with the control cabinet; and the monitoring system comprises a torque measuring mechanism for the threshing cylinder and the grass comminuting device, and a wind field measuring system disposed in the cleaning chamber. The test stand provided by the present invention is novel in structure design, and compared with a conventional test device, the test stand has better test operability.

The invention discloses an indoor space surveying and mapping system and method. The system comprises a surveying and mapping instrument and an intelligent terminal. The surveying and mapping instrument is of a stereochemical structure. An electronic compass, a laser distance measuring sensor, a gravity sensor, a corner distance sensor and a wireless emitter are arranged in the surveying and mapping instrument. The surveying and mapping instrument is adopted for surveying and mapping indoor space anticlockwise or clockwise, the wall direction can be automatically recognize, wall length distance data and wall height distance date can be automatically measured, the wall corner type can be determined, and the areas such as a door, a window and a corridor which does not need to be measured can be automatically recognized. The intelligent terminal automatically draws a three-dimensional space model of the indoor space according to the data obtained through measurement of the surveying and mapping instrument, operation is convenient, intelligent and rapid, time is saved, manpower and material resources are saved, all operations are automatically completed through the instrument, and practicability is high.

The neutron energy spectrum measuring device comprises a neutron moderation cavity, a tubular shell is arranged in the neutron moderation cavity, an opening is formed in the upper end of the shell, the upper end of the shell extends out of the top of the neutron moderation cavity, the bottom of the shell is sealed, and a cylindrical thermal neutron detector is arranged in the shell; a pressure sensor is arranged at the bottom of the neutron moderation cavity; a moderating liquid storage cavity is arranged below the neutron moderating cavity, the moderating liquid storage cavity is communicatedwith the neutron moderating cavity through a pipeline, and a two-way water pump is arranged on the pipeline. The neutron energy spectrum measurement method comprises the steps of device parallelism adjustment, moderating liquid injection, neutron measurement, neutron energy spectrum unfolding and the like. Via the neutron energy spectrum measuring device, the manufacturing difficulty and the manufacturing cost of a neutron energy spectrometer based on the same physical principle are reduced; the device is flexible in measurement mode, convenient to use, small in occupied space and high in measurement result accuracy.

The invention discloses a dimension measurement tool for structure in a joint and with a virtual rotation center. The dimension measurement tool for the structure in the joint and with the virtual rotation center comprises a right component, a left component, an arc rail, a right handle and a left handle, wherein the right component and the left component are connected into a scissor structure through the arc rail, the right handle is connected with the right component, and the left handle is connected with the left component. Tow patulous measurement tips are used to perform cross obstacle measurement on the dimension of the structure in the joint. The virtual rotation center of the dimension measurement tool can guarantee that the diameter of the measurement tips at an incision position of the joint is the minimum, and thereby reduces pain of patients, and improves operation measuring safety. According to the dimension measurement tool for the structure in the joint and with the virtual rotation center, a measurement range is enlarged through a measurement mode of crossing a left slide rod and a right slide rod, the distance between the tips of the left slide rod and the right slide rod can be accurately figured out by using the arc rail and readings of a left slide rail and a right slide rail, and the distance figured out is the structure dimension of a measured object in the joint.

The invention relates to a method for measuring the deflection of a transmission line, comprising: 1) selecting a station and an orientation point; 2) measuring the coordinates of several spatial points on the transmission line, and the coordinates of the spatial points of the two ends of the line; 3) in AutoCAD On the platform, the spatial point coordinates are drawn into a graph; connect the two ends of the drawn graph, and rotate the drawn line segment into a horizontal line segment; 4) Set the rotated view as the current view, and use the PLINE command to connect each measurement in sequence 5) Turn back to the world coordinate system to find the lowest point of the transmission line; 6) Measure the vertical distance between the lowest point of the transmission line and the lowest hanging point, which is the vertical distance of the transmission line deflection. Compared with the prior art, the beneficial effect of the present invention is: use the laser total station to measure the coordinates of multiple spatial points on the transmission line, draw them on the CAD platform, and analyze the deflection and the lowest point of the transmission line Elevation, accurate calculation results, can provide reliable data for transmission line operation and maintenance.

The invention provides an object measurement method and system and a computer readable storage medium, which are used for realizing a multi-degree-of-freedom flexible measurement mode in a measurement process on the basis of keeping high-precision three-dimensional measurement quality, so that the advantages of high efficiency, high precision, high robustness and the like can be shown. The method comprises the steps that a handheld sensing device collects images of an object to be measured at different visual angles under handheld operation of a user, the handheld sensing device is provided with a sensor needed for collecting the images, and the handheld sensing device is obtained by combining handheld operation configuration under the human engineering mechanics requirement; a user terminal acquires an image from the handheld sensing device according to local area network communication connection between the user terminal and the handheld sensing device, and converts the image into point cloud data through data processing; and the server acquires the point cloud data from the user terminal according to the UDP communication connection between the server and the user terminal, performs feature analysis and extraction on the point cloud data, and displays the point cloud data through a three-dimensional visualization engine.

The invention provides a multipoint real-time parallel voltage measurement system based on wireless networking. The problem that an existing wireless voltage measuring device of a low-voltage transformer area cannot achieve multi-point real-time parallel measurement and mobile measurement of voltage is solved. The system comprises N mobile wiring clamps, N voltage measurement terminal modules anda voltage data collection coordinator. The measurement system is connected with a to-be-measured line through a mobile jointing clamp. Voltage is measured in a non-fixed wiring terminal access mode, the measurement mode is more flexible, the purpose of simultaneously and parallelly measuring the voltage of different to-be-measured line nodes in a low-voltage transformer area can be achieved, comparison between the voltage of the different to-be-measured line nodes in the same transformer area by workers is facilitated, and important reference suggestions are provided for transformation of a low-voltage rural power grid. In addition, the transmission of voltage data between the voltage measurement terminal module and the voltage data collection coordinator adopts a wireless communication mode, does not depend on the limitation of network bandwidth, and improves the precision and real-time performance of voltage measurement.

The invention discloses a device for measuring the displacement of an object in a paramagnetic box based on a magnetic mark, and the device comprises a magnetic shielding room, a gantry type measurement rack, the magnetic mark, a first measurement system, and a second measurement system. The gantry type measurement rack is disposed in the magnetic shielding room, and the interior of the gantry type measurement rack is provided with the paramagnetic box containing the measured object. The magnetic mark is fixed at a part, nearest to the internal surface of the paramagnetic box, of the measured object, and is magnetized in a possible displacement direction of the measurement object. The first measurement system is used for recording the magnetic field changes before and after the placement of the measured object and the magnetic field change after the measured object moves. The second measurement system is used for carrying out corresponding one-dimensional coordinate calibration when the first measurement system records the magnetic field changes. The device achieves the no-damage detection of the displacement of the object in a paramagnetic metal or nonmetal box, is higher in detection depth, is lower in error, causes no damage to materials and human bodies, and is suitable for popularization and application.

The invention discloses a digital camera-based three-dimensional measurement method of a shoe tree. The three-dimensional measurement method comprises the following steps: step 1, shoe tree wiring, namely wiring is performed as per the characteristics determining the geometry of the shoe tree, and a target curve needing to be rebuilt is marked to serve as a mark curve; step 2, image taking, namely, the shoe tree marked by the digital camera is taken from different angles to obtain a plurality of images; step 3, image characteristic curve obtaining, namely the lines of mark curves of the shoe tree in various images are subjected to image processing to extract the frameworks of the mark curves, and the frameworks are fit by utilizing an improved snake model so as to obtain the image characteristic curves; and step 4, three-dimensional rebuilding of the image characteristic curves namely, a three-dimensional characteristic curve is obtained and is fit into a three-dimensional shoe tree model. Compared with a conventional method, the digital camera-based three-dimensional measurement method has the advantages of simple measurement hardware, low price, flexible measurement method, and can perform three-dimensional rebuilding of the characteristic curves under the condition that part of image curves is lost or blocked.

The invention discloses a measuring method for microscopic height of a thread of an end seal of a workpiece; measurement is finished by the measuring method by adopting a market-available universal feeler gauge and a market-available universal knife straight edge. The measuring method for the microscopic height of the thread of the end seal of the workpiece comprises the following steps: firstly enabling the measuring end of the knife straight edge, i.e. the blade part, to ride on any chord length of concentric circles of the thread of the end seal of the workpiece, wherein a gap is formed between the extension part of the knife straight edge and the sealing face of the workpiece; then, filling the gap with one or more than one feeler gauge with known thickness, and computing a nominal value of known thickness, i.e. the actual measurement dimension of the microscopic height of the concentric circle thread. According to the measuring method disclosed by the invention, by adopting the principles that the gap is formed between the extension part of the knife straight edge and the sealing face of the workpiece, and then, the gap is measured with the feeler gauge, the dimension of the gap is directly measured, and therefore the height of the concentric circle thread is obtained; the knife straight edge and the feeler gauge are both measuring tools; the measuring method is low in cost and flexible.

The invention discloses test equipment for partial discharge of a cable based on a voltage phase synchronization technology of an optical electric field transducer. The test equipment comprises a handhold insulated tool and instrument, a high voltage BGO optical crystal, a high voltage optical fiber, a photoelectric conversion and output unit, a partial discharge test instrument and a synchronous signal transmission wire. The test equipment disclosed by the invention has the advantages that: the test equipment emphatically solves the difficulty in acquirement and synchronization of a voltage signal in a major network during live line test works of field high voltage equipment, is also applicable to any work that needs acquirement of the voltage signal during electrical test; the test equipment is simple and firm in structure, light in weight (less than 1kg), small in volume and convenient in operation on a basis that functional requirements are met, and is applicable to the requirements on live tests of equipment on a pole and a tower as well as ground equipment.