128 results about "Survey meter" patented technology

The invention discloses an oil-immersed transformer pressure-maintaining sealing detection device, and relates to the technical field of detection devices, the oil-immersed transformer pressure-maintaining sealing detection device comprises a transformer body, the outer surface of the transformer body is provided with an oil storage tank, and the outer surface of the transformer body is provided with a preliminary survey assembly used for preliminarily detecting whether the inner wall of the oil storage tank is slightly damaged. According to the pressure-maintaining sealing detection device for the oil-immersed transformer, when the infrared measuring instrument detects that a suspicious gap exists in the outer wall of the oil storage tank, the negative pressure bin can be inserted into the oil storage tank and rotated in all directions to directly face the suspicious small gap in the inner wall of the oil storage tank, and the negative pressure bin is moved to be tightly attached to the inner wall of the oil storage tank; the oil dirt at the position is cleaned up in a heating and negative pressure mode, then mixed gas of helium and fluorescent powder is conveyed into the sealed space, and the fluorescent powder can be driven by the helium to penetrate through the inner wall of the oil storage tank along the tiny gaps to be attached to the outer surface of the oil storage tank.

A gauge that is configured to detect a time at which radiation enters the gauge. The gauge may include a member that is configured to transition from a first state to a second state upon receipt of the incoming radiation, and may include a light probe that is configured to detect when the member transitions to the second state. The gauge may provide for determining a time of arrival of the radiation at another gauge. For example, the gauge may correlate the time of arrival at the gauge with the another gauge, thereby providing for correlating a response time of a test specimen with actual exposure time of the test specimen to radiation (e.g., an ion beam).

The invention relates to the technical field of soil physical parameter in-situ measurement, and discloses a soil layer natural water content portable intelligent measuring instrument based on multi-source sensing fusion, which comprises a composite probe assembly and an intelligent measurement and control host which are physically connected, the composite probe assembly is configured to be inserted into a soil layer to be tested to construct a multi-physical field test environment, and an electrical transceiving unit and an acoustic transceiving unit are integrated in the composite probe assembly. By constructing a cross physical field excitation and multiphase parameter collaborative decoupling mechanism, a multidimensional dynamic correlation model is established by using the thermosensitive drift characteristic of the sound velocity of a mixed medium during thermal disturbance and the transient step response of a dielectric constant under an acoustic radiation force field; the problems that the coupling influence of the water content and the volume weight cannot be distinguished and the conductivity of bound water and the conductivity of free water are difficult to separate in a traditional means are effectively solved, and four independent physical quantities including the volumetric water content, the in-situ dry volume weight, the bound water content and the actual conductivity of pore water are synchronously inverted through a single probe. And the decoupling precision of the equipment on complex multi-phase soil medium parameters is improved.

The invention relates to the field of textile and printing and dyeing production, and discloses a fabric liquid amount detection and analysis system based on an X-ray absorption spectrum, which comprises an image and data acquisition module, a data storage and analysis module, a ray source and execution module and a client, the image and data acquisition module, the data storage and analysis module, the radiation source and execution module and the client are in communication connection through a network; the image and data acquisition module acquires parameters such as material type, thickness, density, fiber arrangement direction, spectral reflectivity, X-ray attenuation coefficient and the like of the fabric through equipment including but not limited to an industrial camera, a multispectral imaging sensor, a light sensor, an X-ray receiver, a temperature and humidity sensor, a thickness measuring instrument and the like. According to the invention, through the wavelength-adjustable X-ray source and the high-sensitivity detector, by using the X-ray absorption spectrum characteristic, the liquid amount change in the fabric is captured under the nanoscale resolution, and the maximum extraction of the liquid characteristic absorption signal is realized.

The invention discloses an offshore salt mist aerosol monitoring system and method based on a drifting buoy, and relates to the technical field of marine atmospheric environment monitoring, and the method comprises the steps: transmitting the position and time information received by a GNSS receiver to a main control module, and carrying out the resolving of the main control module, and obtaining a preliminary direction; transmitting the data of the attitude measuring instrument to the main control module; the main control module corrects the initial azimuth angle and the elevation angle according to the attitude data, and adjusts the accurate direction of the sun photometer according to the correction result; calculating the optical thickness of the aerosol according to radiation data measured by the sun photometer; the aerosol particle spectrum distribution is inversed according to the aerosol optical thickness; and the main control module performs information interaction on the inverted aerosol particle spectrum distribution and the land through the wireless communication module. The defects of a traditional mode are effectively overcome, and the optical parameters and the dynamic change process of the salt mist aerosol are captured more accurately.

The present application relates to the technical field of silicon wafer production, and discloses a cleaning and drying method and system for silicon wafers, which comprises the following steps: pre-cleaning silicon wafers after being cut; loading the pre-cleaned silicon wafers into a silicon wafer basket; immersing the silicon wafer basket into a cleaning tank to perform main cleaning on the silicon wafers; sending the silicon wafer basket after the main cleaning into a closed drying cavity, measuring the in-situ wetting angle of the contact area between the edge of the silicon wafer and the clamping tooth of the silicon wafer basket by using an optical wetting angle measuring instrument in the closed drying cavity; matching the value of the in-situ wetting angle obtained by detection with a plurality of preset wetting angle intervals, and controlling the infrared radiation array to irradiate and dry the silicon wafer basket according to the drying strategy corresponding to the matched wetting angle interval; sampling the dried silicon wafers, performing the same texturing and thermal oxidation treatment on the sampled silicon wafers, and detecting whether the treated silicon wafers are abnormal; and grading the silicon wafer batches without abnormalities into the warehouse. The method can improve the production yield of silicon wafers.

The utility model discloses a spiral constant flow probe for radon survey meter soil survey belongs to nuclear radiation detection technical field, including intermediate connecting piece, and the bottom end detachable connection of intermediate connecting piece has the gas guide main pipe, and the upper surface of intermediate connecting piece is provided with the flowmeter connecting hole and short stick connecting hole, and the bottom end of intermediate connecting piece is the circular truncated cone structure and is provided with the outer thread, and the gas flowmeter is connected with radon survey meter still, and the bottom end of intermediate connecting piece is the circular truncated cone structure and is provided with the outer thread, and the utility model sets up and has the intermediate connecting piece of thread, and the leakproofness between intermediate connecting piece can pass through the thread promotion and the detection soil, to make the measurement result more accurate.

The utility model discloses a multi -angle adjustable base for full -spectrum ellipsometer, including base, the rear end of base is located with surveying appearance mount, the position of base upper end and located surveying appearance mount front end installs base main part, the base main part is located with base plate, the base plate surface is located with adsorption formula fixed support, surveying appearance mount front end is located with first full -spectrum surveying appearance, second full -spectrum surveying appearance and third full -spectrum surveying appearance in the position of outer ring, and the support frame is located between second full -spectrum surveying appearance and surveying appearance mount. The utility model discloses a multi -angle adjustable base for full -spectrum ellipsometer, adopt advanced rotary compensator measurement result, and there is no surveying dead angle problem, and the influence of the rough surface caused by the elimination polarized effect on the result can also be eliminated, and the multi -incident angle structure design has enhanced the flexibility of instrument measurement, and especially suitable for the measurement occasion of complex sample.

To provide a ground measurement system capable of precisely obtaining a ground state as moving an RI measuring instrument.SOLUTION: A ground measurement system 1 is provided with: a vibration roller 2 (traveling device); a scattering-type RI measuring instrument 10 mounted on the vibration roller 2; a location information receiver 3 receiving location information of the RI measuring instrument 10; a control device 20 producing measurement results of a compaction degree or water ratio of the ground on the basis of radiation data measured with the RI measuring instrument 10; and a display 4 displaying the location information and the measurement result of the RI measuring instrument 10. Every time traveled distance of the RI measuring instrument 10 reaches a specific distance, the control device 20 produces the measurement results and causes the display 4 to display the measurement results.SELECTED DRAWING: Figure 1

The present application discloses a method for source seeking and positioning of a pollution measuring instrument, which includes that a data acquisition and analysis system obtains the count data of each radiation detector in the pollution measuring instrument through the equipped communication module, and after obtaining each count data, matches each count data with the coordinates of each radiation detector to obtain a coordinate array. Among them, the pollution measuring instrument includes a plurality of radiation detectors arranged in an array, and the plurality of radiation detectors are arranged in an array. The data acquisition and analysis system performs Gaussian fitting on the coordinate values in the coordinate array to obtain a Gaussian surface, locates the radiation source according to the Gaussian surface, and stores the positioning information of the radiation source after obtaining it. So that the source seeking and positioning method of the pollution measuring instrument disclosed in the present disclosure can give the radiation distribution on the premise of ensuring the original performance, and facilitate the user to quickly locate the position of the radiation source.

The utility model belongs to the technical field of measurement, and discloses an auxiliary device for measuring equipment. When an obstacle exists near a to-be-measured point and elevation data of the to-be-measured point cannot be acquired, one end of the auxiliary bracket can be lapped to the to-be-observed point, so that the observation reference point is in contact with the to-be-observed point, and then the other end of the auxiliary bracket is connected with the adjusting piece; the inclination angle of the auxiliary support relative to the horizontal plane is adjusted by adjusting the height of the adjusting piece. After it is confirmed that the auxiliary support is parallel to the horizontal plane through the horizontal measuring instrument, the measuring equipment is placed on the installation datum point, the measuring datum plane of the measuring equipment makes contact with the installation datum point, the elevation data, obtained by the measuring equipment, of the installation datum point is the elevation data of the to-be-observed point, and the acquisition process of the elevation data is simplified. According to the utility model, the elevation data of the to-be-observed point can be obtained under the condition that the obstacle exists near the to-be-observed point and the measuring equipment cannot be erected, so that the data integrity of the building settlement observation operation is improved.

The application relates to an oil and water downhole discharging cable hand winch, which comprises a hand winch mechanism, the drum of the hand winch mechanism is wound with a cable, and the left and right ends of the drum are fixedly provided with winches, one end of the right winch is provided with a manual transmission rotating mechanism, a counter mechanism is provided with a hub, the upper end of the hub is overlapped with the cable, a depth measuring instrument is further arranged on the support of the counter mechanism, and a multifunctional cable joint is sealingly connected with the end of the cable. The device provided by the application utilizes the downhole device to replace the manual downhole mode, avoids the contact of personnel with a radiation source, ensures the accuracy of the downhole depth, automatically locks the cable during the test process, and does not cause displacement. The cable can be conveniently recovered after the test, a multi-specification joint is designed, the joint can be flexibly installed and replaced, a plurality of specification flowmeters can be connected to one cable, and the cable does not need to be replaced.

The utility model discloses a handheld course measuring instrument, which belongs to the technical field of surveying and mapping equipment and comprises a waistcoat and a course receiver, a controller is arranged on the front side of the waistcoat, a back plate is arranged on the back side of the waistcoat, a mounting plate is arranged on one side of the back plate, a radio station and a casing are arranged in the center of the mounting plate, and a socket and a mounting seat are arranged at two ends of the mounting plate. A supporting rod is inserted into the socket, an adjusting assembly is arranged in the mounting seat, a stabilizing assembly is arranged at the top of the adjusting assembly, and the course receiver is fixedly connected with the stabilizing assembly. Through the arrangement of the waistcoat, the socket, the mounting seat and the adjusting assembly, a tester can carry on the back for use, the burden of the tester is reduced, the portable function is realized, the lifting of the adjusting screw rod can be controlled through the controller, and the height adjusting function is realized when the tester is carried on the back for use; and centering and leveling are not needed during installation, and the supporting rod and the connecting rod can be held by hand for use after being taken out.

The invention discloses a rapid detection device for the straightness of a riser based on a laser measurement technology, and the device comprises a rack, the rack is rotatably provided with a rotating shaft with an annular groove rubber guide wheel, and is provided with a positioning mechanism and a driving mechanism; the middle of the rack is rotatably connected with an annular plate, the inner wall of the rack is provided with a laser measuring instrument, and the annular plate is meshed with a motor-driven gear through a gear ring; the rubber guide wheels are matched with cleaning, airflow assisting and wiping mechanisms. The device drives the rubber guide wheel to synchronously convey the guide pipe through double power sources, and the motor drives the laser measuring instrument to circumferentially rotate, so that continuous automatic measurement is realized, a measured piece does not need to be manually moved, and the efficiency is greatly improved; the positioning mechanism limits offset rotation of the guide pipe, the cleaning, airflow and wiping integrated mechanism removes pollutants of the guide pipe, sliding errors are avoided, and the measurement precision is guaranteed.

The invention discloses an overline measuring instrument and a line detection method using the overline measuring instrument, and relates to the technical field of cable detection equipment, the overline measuring instrument comprises a main walking assembly, an auxiliary walking assembly arranged on the main walking assembly, a main driving assembly, and a detection assembly arranged on the main walking assembly and / or the auxiliary walking assembly; an auxiliary driving assembly is arranged between the main walking assembly and the auxiliary walking assembly; the main walking assembly comprises main obstacle crossing units and a first supporting piece, and the main obstacle crossing units are arranged at the two ends of the first supporting piece; the auxiliary walking assembly comprises auxiliary obstacle crossing units and a second supporting piece, and the auxiliary obstacle crossing units are arranged at the two ends of the second supporting piece; when the cross-line measuring instrument crosses an obstacle on a line, the main obstacle crossing unit close to the obstacle, the auxiliary obstacle crossing units and the main obstacle crossing unit away from the obstacle sequentially cross the obstacle, and when the main obstacle crossing unit or the auxiliary obstacle crossing units cross the obstacle, the auxiliary obstacle crossing unit or the main obstacle crossing unit which does not cross the obstacle keeps clamping the line, so that the obstacle crossing stability of the cross-line measuring instrument is improved.

The present application relates to the technical field of product quality and safety, in particular to a high-throughput rapid screening method for radioactive substances in waste textile raw materials, comprising the following steps: step one, raw material preselection; step two, raw material pretreatment; step three, radioactive substance detection; step four, radioactive substance measurement and analysis; step five, detection of Sr-90 content in raw materials; and step six, reagent addition. The present application proposes a research on common gamma nuclides and Sr-90 content analysis in textile raw materials, ensures the radioactivity safety of textile raw materials, establishes a method for detecting radioactive substance Sr-90 in waste textile raw material solid waste by using a low-background alpha beta measuring instrument, the average recovery rate of the method is 80%, the average detection limit, and the radioactive detection of waste textile raw materials is studied. The research results show that the content of gamma radioactive nuclides in the selected waste textile raw material samples meets the national limit standard requirements, and reduces the pollution of common radioactive nuclides.

The utility model discloses a level gauge, which relates to the technical field of measuring instruments and comprises a scale, a first fixing plate, a first bubble tube and an adjusting component for adjusting the detection angle of the first bubble tube, the first fixing plate is mounted at the top of the scale, and the first bubble tube is arranged inside the first fixing plate. The adjusting assembly comprises a movable groove, the movable groove is formed in the first fixing plate, a first gear is rotationally connected into the movable groove, the first bubble pipe is installed in the first gear, and a fixing assembly used for fixing the rotating angle of the rotating disc is arranged at the top of the first fixing plate. According to the utility model, the position of the magnet is adjusted through the threaded rods on the two sides, so that the scale can be firmly adsorbed on detection surfaces, curved surfaces, inclined surfaces and the like with different shapes or angles, and different measurement requirements including calibration of inclined planes with specific angles and adjustment to 45 degrees or other gradients can be met by rotating the angle of the first bubble tube.

The utility model belongs to the technical field of under-forest surveying and mapping, and particularly relates to an under-forest surveying and mapping support which comprises a surveying and mapping instrument connecting seat and is characterized in that the bottom of the surveying and mapping instrument connecting seat is rotatably connected with three supporting rods, the supporting rods comprise a first connecting rod, a second connecting rod, an inner threaded pipe and a positioning rod, and the first connecting rod is a one-third cylinder; the surveying instrument connecting seat and the measuring instrument above can be supported through the three supporting rods so that the surveying instrument connecting seat and the measuring instrument can be kept stable in the measuring process, when the three supporting rods rotate to be parallel to one another, the three supporting rods can be in a folded state, and the three first connecting rods and the three second connecting rods are tightly attached to one another; the three supporting rods are arranged, so that the three supporting rods form a complete cylinder, the stress of the three supporting rods is more concentrated, the three folded supporting rods can be used as crutches, when a surveying and mapping person walks in a forest, the crutches can be used for supporting, and the stability and convenience of movement of the surveying and mapping person in the forest can be improved.

The utility model discloses a triangular circle measuring instrument, and belongs to the technical field of measuring instruments. Comprising a V-shaped support arranged on one side of a base; the measuring meter is arranged on the other side of the base; the workpiece supporting rod is located on the inner side of the V-shaped support, vertically penetrates through the base in a sliding mode and abuts against the outer surface of the to-be-detected workpiece; and two ends of the lever are respectively connected with the workpiece supporting rod and the measuring meter supporting rod. According to the utility model, measurement data is amplified through the lever and is reflected on the measurement meter, so that better feedback is obtained; and the rotating hand wheel is arranged, so that the pressing wheel linked with the rotating hand wheel drives the workpiece to rotate, and measurement errors can be better avoided.

The utility model relates to the technical field of radiation monitoring, in particular to a low-background alpha and beta measuring instrument which comprises a measuring machine body, four walking pulleys used for movably supporting the measuring machine body are symmetrically arranged at the bottom end of the measuring machine body, and a bottom cavity and a right-angle cavity channel which are communicated are formed in the lower end of the measuring machine body. The measuring machine body is provided with a loading mechanism used for fixing and supporting the measuring machine body through the bottom cavity and the right-angle cavity channel. The measuring machine body with the vertical cabinet structure is arranged, and the walking pulleys are symmetrically arranged at the bottom end of the measuring machine body, so that the measuring machine body can conveniently, stably and horizontally move through the walking pulleys; a bottom cavity and a right-angle cavity channel which are communicated with each other are formed in a measuring machine body to drive a lifting support to do reciprocating lifting movement, meanwhile, a driving wedge block and a driven wedge block which movably abut against each other are arranged in the right-angle cavity channel, so that the driven wedge block provided with a strong support stretches out and draws back repeatedly under the driving action of a driving motor, and therefore fixed supporting is provided for the measuring machine body.

The application discloses a multi-angle surveying auxiliary device, which comprises a base, wherein a balancing mechanism is installed on the base; the balancing mechanism comprises an arc-shaped rod, a circular frame capable of rotating along an X-axis is connected to the arc-shaped rod through two X-axis rotating members, a balancing shell capable of rotating along a Z-axis is connected to the circular frame through two Z-axis rotating members, a counterweight is fixedly installed at the bottom end of the balancing shell, and a measuring instrument assembly is installed at the center of the balancing shell; an X-axis support seat is arranged on the arc-shaped rod, an X-axis rotating driving device is installed on the X-axis support seat, the output end of the X-axis rotating driving device is connected with the X-axis rotating member through an X-axis electromagnetic clutch, a Z-axis telescopic driving device is further installed on the X-axis support seat, the output end of the Z-axis telescopic driving device is connected with a Z-axis support seat, a friction roller capable of frictionally matching with the outer surface of the balancing shell is rotatably installed on the Z-axis support seat, a Z-axis rotating driving device is further installed on the Z-axis support seat, and the output end of the Z-axis rotating driving device is connected with the friction roller through a Z-axis electromagnetic clutch.

The utility model belongs to house building auxiliary equipment technical field relates to a house construction surveying device, including the height adjusting device of accommodation box movable installation, the angle adjusting device is detachably arranged on the height adjusting device, and the support device is abutted on one side of height adjusting device, and the cover plate is hinged on the accommodation box, and the surveying appearance is detachably installed on the angle adjusting device. The utility model through the first motor drive base pole rotation, and the combination screw rod and the screw connection structure of base pole, realized the flexible adjustment of surveying appearance height, at the same time, the situation of avoiding setting up the vertical pole to be too long to satisfy the high measurement demand is avoided with angle adjusting device, guarantees the surveying height while, effectively controlled the space required when receiving, make the accommodation box volume more reasonable, convenient for construction personnel to carry and remove, improved work efficiency, support device can effectively prevent the base pole from shaking or tilting during the measurement process, thereby ensuring the perpendicularity of the surveying instrument, improving the measurement accuracy.

The utility model relates to a temporary protection device for a plug-in level gauge. At present, when a temporary protection device of a leveling instrument adopts a plastic film, the temporary protection device is easy to age and damage in a complex surveying and mapping environment, and loses a rainproof effect once being damaged. A temporary protection device of a plug-in level measuring instrument comprises a left protection cover and a right protection cover, the left protection cover and the right protection cover are connected in a plug-in mode, and an opening of the right protection cover is inserted into a socket of the left protection cover. Locking mechanisms are installed on the inserting plates on the two sides and the top of the left protective cover respectively, lock holes used in cooperation with the locking mechanisms are formed in the inserting plates on the two sides and the top of the left protective cover respectively, and the left protective cover and the right protective cover are fixedly connected through the locking mechanisms. The inserting plates on the two sides and the top of the right protective cover are inserted into the opening edge positions of the two sides and the top of the left protective cover correspondingly, and the inserting plate at the bottom of the right protective cover and the inserting plate at the bottom of the left protective cover are of an attached structure. The leveling instrument is applied to the field of leveling instruments.

The utility model discloses ionization chamber radiation dose measuring equipment, which comprises an electromagnetic radiation measuring instrument and a measuring support plate, the upper side of one end of the measuring support plate is rotatably provided with a measuring instrument bayonet socket through a vertical plate and a connecting shaft, and a handheld part at one end of the electromagnetic radiation measuring instrument is inserted into an inserting groove in the measuring instrument bayonet socket. The upper end of the measuring support plate is rotatably provided with a connecting shaft, one end of the connecting shaft is in transmission connection with a first motor through a first gear set, the lower end of the measuring support plate is rotatably provided with a lower support rod through a bearing seat and a bearing, and a second motor is in transmission connection between the bearing seat and the lower support rod through a second gear set. The handheld part at one end of the electromagnetic radiation measuring instrument is inserted into the insertion groove in the measuring instrument insertion seat and is used for performing insertion positioning on one end of the electromagnetic radiation measuring instrument, operation measurement can be performed without hand holding, and the convenience of measurement and use is improved.

This invention discloses a laser measuring instrument for detecting expansion joints in municipal bridges, relating to the field of bridge expansion joint detection. It includes a detection frame and a detection component. The detection component is positioned on one side of the detection frame. A guide rod is fixedly mounted at the bottom of the detection frame, and an adjusting plate is slidably connected to the guide rod. An oil chamber is fixedly mounted on the detection frame, and a drive motor is fixedly mounted at the end of the rollers of the roller frame. A level is fixedly mounted at the top of the detection frame. A horizontal moving component is connected to the output end of a second electric push rod, and this horizontal moving component is rotatably connected to the adjusting plate to drive the adjusting plate to move horizontally along the guide rod. This laser measuring instrument for detecting expansion joints in municipal bridges, through the integrated design of the detection frame, electric leveling component, and laser detection component, solves the problems of traditional bridge expansion joint detection, which requires manual handheld equipment for segmental inspection, is cumbersome and inefficient, and cannot adapt to deformation deviations of expansion joints caused by thermal expansion and contraction.

The present invention provides a method for dynamically predicting the thermal performance of a parabolic trough solar collector and a testing device thereof. The testing device comprises a mirror reflectance measuring instrument, an inlet temperature sensor, an outlet temperature sensor, a flow meter, an automatic tracking direct heat radiation meter, an ambient temperature sensor and an anemometer. The dynamic prediction method comprises the following steps: firstly, measuring the structure and performance parameters of the collector itself, then performing a dynamic test of the thermal performance of the collector, obtaining the inlet temperature, outlet temperature, volume flow data of the heat transfer medium in the collector and ambient meteorological data, and calculating the solar altitude angle and azimuth angle data, then generating a training sample data set from the obtained data, establishing a neural network model on a computer, and performing training and optimization using the established training sample data set, and finally predicting the outlet temperature of the collector under the specific working conditions to be analyzed, thereby obtaining the thermal performance of the collector.

The utility model relates to the field of measuring equipment, and discloses an elevation control measuring device which comprises a mounting rack, a telescopic rod which is telescopically arranged at the upper end of the mounting rack and is used for supporting a measuring instrument, and a fixing mechanism which is arranged at the lower end of the mounting rack and is used for fixing the mounting rack, the base is arranged at the lower end of the mounting frame in a turnover manner; according to the utility model, the fixing mode can be flexibly adjusted according to the ground condition, it is ensured that the mounting rack can be stably fixed on the ground under various topographic conditions, the error caused by the shaking of the device in the measurement process is effectively avoided, the measurement accuracy is improved, and the measurement accuracy is improved. And the measurement stability is improved.

The embodiment of the utility model relates to the field of radiation environment monitoring, in particular to a device suitable for measuring the background value of a radon concentration measuring instrument, which comprises a container, a vacuumizing interface, a nitrogen inlet interface, a nitrogen outlet interface and a nitrogen concentration measuring piece. The container forms an accommodating cavity for accommodating nitrogen; the vacuumizing interface is used for vacuumizing the accommodating cavity; the nitrogen inlet connector is in fluid communication with the containing cavity and used for allowing high-purity nitrogen to enter the containing cavity; the nitrogen outlet connector is in fluid communication with the containing cavity and used for discharging gas in the containing cavity outwards, and the nitrogen outlet connector is further connected with a gas inlet of the radon concentration measuring instrument; the nitrogen concentration measuring part is used for measuring the concentration of nitrogen in the containing cavity so as to determine that the gas in the containing cavity can be used for measuring the background value of the radon concentration measuring instrument. The device provided by the embodiment of the utility model is beneficial to improving the accuracy of the background value measured by the radon concentration measuring instrument.

The invention relates to the technical field of surveying and mapping devices, in particular to an interior design surveying and mapping device which comprises a fixing plate, sliding assemblies are arranged on the outer wall of the fixing plate, three supporting assemblies are fixedly connected to the top of the fixing plate, and placing assemblies are arranged on the outer walls of the three supporting assemblies. According to the surveying and mapping device for the interior design, the protective plate moves downwards along with the connecting plate, so that the protective plate which is originally protected on the measuring instrument moves downwards, mist or dust and the like which are left on a lens are scraped off, the precision of the device is ensured, and the surveying and mapping device is convenient to use. When indoor light is sufficient, sunlight and sunlight refraction are easily caused, due to the arrangement of the spherical joint, the protection plate is adjusted and rotated to a proper angle when light or an object prone to reflection is refracted, and the situation that the measurement precision is reduced and errors are increased due to the fact that the measurement instrument is interfered by the object prone to reflection or the light during surveying and mapping is reduced.