145results about How to "Realize on-site inspection" patented technology

The invention relates to the technical field of biology, and specifically provides a detection kit for a detection kit for antigens of a novel coronavirus (SARS-CoV-2). According to the detection kitprovided by the invention, the antigens of the SARS-CoV-2 are detected by virtue of a colloidal gold double antibody sandwich method, and two monoclonal antibodies and colloidal gold are mixed for labeling, so that a detection result of the antigens of the SARS-CoV-2 is accurate and high in sensitivity, and meanwhile, the detection rate can be remarkably increased. According to the detection kit,a blank in immunological detection of the SARS-CoV-2 is filled up, and field detection can be realized without a detection instrument, so that the time and the labor are saved, and operation is flexible.

The invention discloses a classification test method and a classification test system for edible oil and swill-cooked dirty oil. The classification test method comprises the following steps that: Raman fingerprint databases for edible oil and swill-cooked dirty oil are first created, and the notable difference between the maximum Raman intensity values of the characteristic peaks of edible oil and swill-cooked dirty oil within a five-band wave number range and the threshold of the difference are then obtained by way of comparison; and in a practical test, the variety of a tested samples obtained by extracting the maximum Raman intensity value of the characteristic peak of the tested sample within the five-band wave number range and comparing the maximum Raman intensity value with the difference threshold. The classification test system comprises a light source system, an optical splitter, a sample box and a measurement control unit. The invention has the advantages of flexibility and high specificity, and can effectively test whether a tested sample is pure swill-cooked dirty oil, pure edible oil meeting the active national standard or edible oil mixed with swill-cooked dirty oil or not; and meanwhile, the operation is simple and convenient, the testing time is short, and swill-cooked dirty oil can be tested on the spot.

A detection method includes preparing single cloning antibody by steps of antigen synthesis, mouse immune, cell fusion, hybrid tumor selection and its cell line collection, extracting ZEN in corn sample by methanol / aqueous solution; filtering and deluting it; flowing liquid sample through affinity column and it by methanol; and using fluoresclence spectrophotometer to measure out content of zearlenone in set sample solution.

The invention discloses a test strip for fluorescence immunochromatography of myeloperoxidase. The test strip comprises a base plate, a sample pad, a binding pad, a nitrocellulose membrane and an absorbent pad, and the sample pad, the binding pad, the nitrocellulose membrane and the absorbent pad are assembled on the base plate in a sequential overlapping manner, wherein the absorbent pad and thebinding pad are respectively pressed on two ends of the nitrocellulose membrane in an overlapping manner, and a detection area is formed on the surface of the nitrocellulose membrane; the sample pad is pressed on the binding pad in an overlapping manner, and a myeloperoxidase antibody-fluorescent microsphere compound is immobilized on the binding pad; and the nitrocellulose membrane in the detection area is coated with a detection line formed by a monoclonal antibody for recognizing another epitope of myeloperoxidase and a control line formed by a goat anti-mouse IgG polyclonal antibody. The test strip has the advantages of high sensitivity, high stability, realization of the detection linearity being 3.125-600 ng / ml, no non-specificity, short detection time of 5 min, realization of bedside quick test, and great improvement of the clinical diagnosis efficiency.

The invention discloses a probe, a primer, a kit, and a detection method for detecting novel coronavirus SARS-CoV-2, and application, belongs to the technical field of molecular biology nucleic acid detection technology, and aims to solve problems in field detection, reduce pollution caused in detection process, increase virus RNA detection sensitivity and specificity. The invention provides the probe and the primer for detecting novel coronavirus SARS-CoV-2, and the kit containing the probe and the primer. The invention further provides a whole-course encapsulated procedure for exponential amplification from RNA (WEPEAR method). According to the invention, the detection sensitivity on N gene as low as 1ag (about 4 copies) is realized; the detection sensitivity on S gene as low as 1 copy is achieved, meanwhile, double genes of virus nucleic acid RNA based on RT-RPA (or RT-ERA) are detected at the same time so as to further improve the reliability of the detection result, and the kit can be used for field detection or household detection.

The invention proposes a direct-current watt-hour meter calibrating device which comprises a standard direct-current ammeter module, a direct-current programmable controlled voltage source module, a direct-current programmable controlled current source module and a system control module, wherein the system control module respectively inputs detected voltage and current signals into the direct-current programmable controlled voltage source module and the direct-current programmable controlled current source module, the direct-current programmable controlled voltage source module and the direct-current programmable controlled current source module carry out measuring and metering according to the input voltage and current signals, and output a direct-current standard voltage source and a direct-current standard current source, a voltage output end measuring circuit is arranged between the standard direct-current ammeter module and the output end of the direct-current standard voltage source, and a current output end measuring circuit is arranged between the standard direct-current ammeter module and the output end of the direct-current standard current source. The direct-current watt-hour meter calibrating device can carry out field detection on direct-current watt-hour meters, thereby improving the efficiency and safety of detection.

The invention relates to a differential ion mobility spectrometry and high field asymmetric waveform ion mobility spectrometry combination device, which comprises a differential ion mobility spectrometry, a high field asymmetric waveform ion mobility spectrometry and an interface device connecting the differential ion mobility spectrometry and the high field asymmetric waveform ion mobility spectrometry, and is characterized in that the differential ion mobility spectrometry comprises a first substrate, a first gas inlet port, an ion source, an ion source substrate, a second gas inlet port, afirst tail gas port, a first ion selective electrode and a second ion selective electrode, the high field asymmetric waveform ion mobility spectrometry comprises a second substrate, a third gas inletport, a second tail gas port, a first ion separation electrode, a second ion separation electrode, a weak current detection electrode, a weak current detector and a bias electrode, and the interface device is composed of a first traction electrode and a second traction electrode. According to the technical scheme, the device realizes twice separation for differences in spatial position and migration speed of ions of a substance under test, and can realize field detection of the ion mobility spectrometry for pollutants in a complex environment.

The invention discloses a CyHV-2 (Cyprinid Herpesvirus 2) monoclonal antibody, a hybridoma cell and an application of the CyHV-2 monoclonal antibody. The CyHV-2 monoclonal antibody disclosed by the invention is secreted from a hybridoma cell GFHNV-6G7 with the collection number of CCTCC No. C2013114 or hybridoma cell GFHNV-3B5 with the collection number of CCTCC No. C2013115. The CyHV-2 monoclonal antibody disclosed by the invention has good specificity and potency; by producing rapid immunodetection test paper from the CyHV-2 monoclonal antibody, the speed and efficiency of detection can be increased, and field detection on CyHV-2 can be realized. The CyHV-2 monoclonal antibody disclosed by the invention makes up the blank in immunodetection on the CyHV-2 and lays a foundation for immunological research on the CyHV-2.

The invention provides a device and a method for determining dissolved methane in seawater. The device for determining dissolved methane in seawater includes: a pump, a gas cylinder, continuous flow balance extractors, a sample injection ring and a gas analyzer. Each continuous flow balance extractor comprises a spiral coil and a bubble separation chamber. The lower part of the bubble separation chamber is provided with an inlet, the upper part of the bubble separation chamber is provided with an air outlet, and the side wall is connected to a liquid outlet pipe. The upper port of the spiral coil is in connection with the inlet of the bubble separation chamber, and the lower port of the spiral coil is in connection with a liquid inlet pipe and an air inlet pipe. The pump is connected to the liquid inlet pipes, the air inlet pipes are connected to first mass flow controllers, and the gas cylinders are connected to the first mass flow controllers through a valve. The air outlet of the bubble separation chamber is in connection with the sample injection ring, which is connected to an injection port of the gas analyzer. The measurement accuracy of the device for determining dissolved methane in seawater is improved, and the analysis efficiency is enhanced.

The invention discloses a method for detecting the content of benzoyl peroxide in flour. The method comprises the following steps of adding an organic solvent into flour, fully stirring, carrying out immersion to obtain benzoyl peroxide extract, carrying out centrifugation of the benzoyl peroxide extract to obtain supernatant liquid, putting the supernatant liquid into a colorimetric pipe, addinga potassium iodide solution into the colorimetric pipe, adjusting a pH value of the mixed solution in the colorimetric pipe to a pH value of 2 by strong acid, placing the colorimetric pipe in the shadow until a reaction is balanced; adding a starch indicator into the colorimetric pipe, adding water into the colorimetric pipe for dilution of the mixed solution in the colorimetric pipe, and comparing a color of the diluted solution in the colorimetric pipe with colors of a standard colourimetric card to determine the content of benzoyl peroxide. The method is easy for operation, does not need ahigh-priced apparatus, reduces a detection cost and detection time, has low requirements for detection persons and a detection environment, can realize on-site detection, and is suitable for on-site analysis and large-area screening work.

This invention discloses one spring steel carbon layer removing depth test method, which belongs to thermal process carbon layer depth lossless test technique field, wherein it uses spring steel part for quenching and annealing organization change to rouse size change to test parts diameter before and after thermal process; its processes the test in the thermal process according to its diameter difference values.

The invention discloses a portable cholesterol molecular imprinting silk-screen printing electrochemical tester and belongs to the technical field of rapid detection. A silk-screen printing electrode is polymerized with template molecule cholesterol by electroplating and a mixed solution of a purified sample and conductive liquid is dropwise added on the surface of a working electrode of the silk-screen printing electrode; current of cholesterol can be directly read by the portable cholesterol molecular imprinting silk-screen printing electrochemical tester; a standard curve is corrected according to a silk-screen printing electrode piece with the cholesterol with the standard concentration; and the concentration of the cholesterol in the detected sample is calculated by a built-in program. The tester disclosed by the invention has a simple structure, is portable, sensitive, rapid and accurate, has high specificity and is economical. The tester can be used for directly detecting the cholesterol, has the advantages of portability, sensitivity, rapidness, high specificity and the like, has low price and is suitable for detecting the cholesterol on a base layer or in the field.

The invention discloses a method and a device for detecting the corrosion of a grounding grid of an electric transmission line iron tower. The device comprises a polarization resistance detection unit, a dielectric resistance detection unit, a Tafel constant detection unit, a detection result generating unit and a detection result output unit, wherein the polarization resistance detection unit is used for applying a linear polarization direct current signal to detected grounding grid metal and soil medium for measuring the polarization resistance of a corrosion system; the dielectric resistance detection unit is used for applying a high-frequency alternating current signal to the detected grounding grid metal and soil medium for measuring the dielectric resistance of the corrosion system; the Tafel constant detection unit is used for applying a weak polarization direct current signal to the detected grounding grid metal and soil medium for measuring the Tafel constant of the corrosion system; the detection result generating unit is used for calculating and generating the actual polarization resistance of the corrosion system according to the polarization resistance and the dielectric resistance and calculating and generating corrosion current detection data of the detected grounding grid metal according to the actual polarization resistance and the Tafel constant; and the detection result output unit is used for outputting detection result data including the corrosion current density data. The device is used for solving the problem of corrosion detection of the grounding grid of the electric transmission line iron tower.

The invention discloses a DNA methylation real-time detection method and an application thereof. Based on DNA double-stranded long-range electron transfer characteristic, a specific chemical derivative reaction is combined, a rapid and simple DNA methylation dynamic process real-time electrochemical detection method and an electrochemical biological sensor are established, which can be used for real-time detection of a DNA methylation process, enzyme inhibitor screening and enzyme sequence preference research.

Present invention refers to jewelry internal structure detection method. It contains dividing the light emitted from low time coherence light source into first light beam and second light beam by spectroscope, first light beam and second light beam respectively radiation to a sample arm with fixed jewelry and reference arm generating optical path variation and reflexible light, adjusting optical path to make reference arm reflected light and sample arm reflected light generating interference signal, jewelry converting interference signal to correspondent electrical signal, transmitting electrical signal to signal processing analyzer, changing reference arm optical path to obtain jewelry layer depth directional one dimension reflected light strong signal and scanning tested jewelry to obtain two-dimension internal structure optical slicing image. Said invention utilizes optical interference principle to make poor jewelry inner back scattering light and rather strong reference light generating interference, through detection interference optical signal to detect jewelry inner structure, greatly raises detecting SNR and sensitivity.

The invention relates to a method for detecting ractopamine content in food. The method is characterized by comprising the following steps: preparing a capture probe; preparing a signal probe, treating a sample to be detected, and detecting by using a glucometer. Compared with the prior art, the method has the advantages that the signal is converted into a glucose signal which can be detected by the glucometer through an enzymatic effect, field detection of a nonsugar glucometer is realized, the stability is high, the detection limit is low, the detection range is wide. Moreover, the detection cost is low, the detection program is simple, the detection effect is good, particularly general staff can perform field detection, and the strict requirement that the professional staff need to operate in a lab in the prior art is avoided.

The invention discloses an onsite detection device for a pressure sensor of a valve cooling system. The onsite detection device comprises a pressure controller and a pressure checking platform. The pressure controller comprises an electric pneumatic pump, an air storage tank, an expansion tank and a water box, wherein the output end of the electric pneumatic pump is connected to the air inlet of the expansion tank via the air storage tank, the water outlet of the water box is connected to the water inlet of the expansion tank, and the water outlet of the expansion tank is connected to the pressure checking platform. The pressure checking platform comprises a conveying pipeline, a control valve, the pressure sensor and a draining valve, wherein the water outlet of the expansion tank is connected to one end of the conveying pipeline, the draining valve is arranged at the other end of the conveying pipeline, the pressure sensor is mounted on the conveying pipeline, the control valve is mounted on the conveying pipeline between the pressure sensor and the expansion tank, and the pressure sensor comprises a pressure etalon and a meter to be detected. The invention also discloses an onsite detection method for the pressure sensor of the valve cooling system. Thus, full-automatic highly-reliable onsite pressure sensor detection with hydraulic pressure control is realized.

The invention relates to a wiping extraction-surface-enhanced Raman scattering film for on-site fast detection of an explosive and its preparation method and use. The surface of a silver nanowire film is modified to form a modified silver nanowire film. The silver nanowire film and a detection method using the same utilize electrostatic interaction of the modified material and explosive characteristic ions to realize inorganic explosive characteristic ion detection and simulative inorganic explosive detection. The modified silver nanowire film can realize on-site rapid detection of nitro-containing organic explosives.

The invention discloses the production method of immune sensing electrode for detecting chloramphenicol residue, involving detection technology field; its characteristic is that the said immune sensing electrode is the nano-modified printing electrode affixed with chloramphenicol antibody fixed sensing membrane, and the production method of the said immune sensing electrode as follows: 1) chloramphenicol monoclonal antibody preparation; 2) chloramphenicol antibody fixed membrane preparation; 3) drug enzyme label preparation; 4) screen printing electrode production; 5) nano-modified electrode production; 6) immune sensing electrode production; 7) finally, connecting electric signal output, display and data processing, transformation electronic components system, and when measuring, it can directly display the content or concentration value of measured remnants; using the immune sensing electrode biosensor, the detection is accurate, sensitive, inexpensive, rapid response and detection, good selectivity, simple operation, easy to carry, repeatedly used, and capable of in field detection and on-line detection of chloramphenicol residues.

The invention discloses a haemonchus contortus nucleic acid detecting primer pair and probe. Nucleotide sequences of upstream and downstream primers of the primer pair are shown as a sequence 1 and asequence 2 in a sequence table, and a nucleotide sequence of the probe is shown as a sequence 3 in the sequence table. The invention further discloses a rapid detection kit and a detection method. Thehaemonchus contortus nucleic acid detecting primer pair and probe and the rapid detection kit are established on the basis of molecular biology, the primer pair and the probe are capable of realizingspecific amplification of haemonchus contortus, the rapid detection kit for rapid haemonchus contortus nucleic acid detection is higher in sensitivity than PCR (polymerase chain reaction) and is highin specificity and detection speed, and high simplicity and convenience in result determination operation are achieved. By combination of the detection method, the detection kit and an existing nucleic acid rapid extraction method, farm onsite detection in a non-lab environment can be realized, and accordingly measures can be taken timely to clear haemonchus contortus.

The invention discloses a primer set, probe kit and detection method for quickly detecting an African swine fever virus based on a RPA method. The primer set and the probe comprise a primer set and aprobe, wherein the primer set comprises a forward primer RPA-F and a reverse primer RPA-R; the total amplification product size of the primer set and the probe is 267bp; and the kit comprises the primer set and the probe. The detection method comprises the following steps of synthesizing the primer set and the probe; and establishing an RPA-LFD detection method. According to the primer set, the probe, the kit and the detection method disclosed by the invention, complex and refined instruments and equipment are not needed, so that the fund investment is reduced; the implement process is simpleand easy to operate, and on-site detection can be performed without specialized detection staff; and the detection is quick and accurate, so that on-site visualized detection of African swine fever can be realized, and the primer set, the probe, the kit and the detection method have important significance to prevention and control of the African swine fever virus.

The invention discloses a fluorescence immunochromatographic assay detection test paper for kanamycin residues and a preparation method of the fluorescence immunochromatographic assay detection test paper. The fluorescence immunochromatographic assay detection test paper comprises a sample cushion, an antibody binding cushion, an NC cellulose membrane and a bibulous paper, wherein the sample cushion, the antibody binding cushion, the NC cellulose membrane and the bibulous paper are sequentially and mutually overlapped through a bottom plate with adhesives from bottom to top; a coating detection line, namely a T line and a quality control line, namely a C line are sequentially arranged at one end close to the antibody fixation cushion, of the NC cellulose membrane; the antibody fixation cushion is used for bearing conjugates of fluorescence labeling antibodies; the T line which is sprayed and drawn by a coupling coating antigen Kana-BSA and a C line which is sprayed and drawn by a goat anti-rat secondary antibody IgG are separately arranged on the NC cellulose membrane from top to bottom; a fluorescence labelling probe is made from rare earth fluorescence silicon dioxide nanometer particles, and the fluorescence labeling probe is bound to the antibodies by using aldehyde group glucan as a cross-linking reagent; the preparation conditions of the fluorescence immunochromatographic assay test paper strip are inspected by a gel imaging system and a fluorescence chart reader; and the fluorescence intensity of the T line is detected by the fluorescence chart reader, and the quantitative detection is completed through a standard curve of the kanamycin antigen concentration.

A verticality symmetry inspection tool of a differential shell belongs to the technical field of automobile machining. The verticality symmetry inspection tool comprises a mandrel and a positioning mandrel, wherein the center of the positioning mandrel is provided with a positioning hole, and the mandrel is plugged into the positioning hole and connected with the positioning mandrel. Compared with the prior art, the verticality symmetry inspection tool has the beneficial effects that in-situ inspection can be realized, the inspection process is simple, the inspection precision is high, the inspection cost is low, and convenience in inspection is realized.

The invention relates to an intermediate shaft spiral gear meshing position degree gauge. The intermediate shaft spiral gear meshing position degree gauge includes an auxiliary measurement device anda base; two support blocks for supporting an intermediate shaft are fixed to the base and are located at the two shaft ends of the intermediate shaft respectively to locate the shaft end excircles andend faces of the intermediate shaft, a support is fixed to the portion, located at the side of the intermediate shaft, of the base, and a first bolt for locating a first gear on the intermediate shaft and a second bolt for locating a second gear on the intermediate shaft are mounted on the support; the auxiliary measurement device is fixed to the intermediate shaft, rotates along with rotation ofthe intermediate shaft and is provided with a scale line marking face extending in the radial direction of the intermediate shaft. The intermediate shaft spiral gear meshing position degree gauge candirectly detect the position degree at a production site during machining, the procedure and quality are convenient to control, and unnecessary carrying links can also be omitted.

The invention provides a fluorescent paper based sensor for visually detecting Fe<3+> and a preparation method thereof. First, a nitrogen-doped graphene quantum dots (N-GQDs) fluorescent probe solution is prepared, and then the N-GQDs fluorescent probe is fixed on a paper medium to obtain a fluorescent paper based sensor. After Fe<3+> with different concentration is added in drops, the fluorescentpaper based sensor can produce the change of fluorescence intensity, so as to achieve visual detection. The fluorescent probe solution can be immobilized by two methods which are a soaking method andan ink jet method. The soaking method comprises the following steps of: soaking filter paper in the N-GQDs probe solution for incubation to obtain a solid fluorescent probe; the ink jet method uses the N-GQDs probe solution as ink to print the fluorescent probe on security paper by spraying the ink. The two fluorescent paper based sensors are convenient in detection and fast in response speed, can achieve naked eye detection of Fe<3+> under ultraviolet light, are suitable for on-site real-time visual detection, and provide an effective way for detecting Fe<3+> in a water phase.

The invention discloses a homogeneous analysis method based on micro-channel resistance change caused by state change of insulating microspheres, which comprises the steps of respectively modifying biological recognition molecules on the surfaces of the insulating microspheres, adding a target object to be detected for biological reaction, and applying constant voltage or current to the two ends of the micro-channel to form a closed-loop circuit, wherein the mixed solution flows through the micro-channel under the driving of electroosmotic flow, the resistance of the closed-loop circuit is increased when the insulating microspheres pass through the micro-channel, the rising amplitude is related to the aggregation state of the insulating microspheres, and the content of the target object tobe detected can be indirectly obtained by detecting the change value of the current or voltage of the closed-loop circuit. The method does not need any washing and separation steps, only relates to one-step biochemical reaction, greatly shortens the analysis time on the premise of ensuring the accuracy, has the advantages of accuracy, rapidness, low cost and the like, and has a good application prospect in the fields of food safety, in-vitro diagnosis, environmental monitoring and the like needing on-site rapid detection.

The invention provides a malachite green selective electrode and a manufacturing method thereof. The electrode is formed by combining a sensitive membrane, internal filling liquid, an internal ratiometric electrode, an electrode pole and an epoxy resin, wherein the sensitive membrane contains an electric active substance and a restricted-access media-molecularly imprinted polymer two-dimension functional material (RAM-MIPs). The RAM-MIPs two-dimension functional material introduced in the invention has the advantages of reducing diffusion coefficient of ions in the membrane and improving electrode selectivity and the like; simultaneously the internal filling liquid is optimized; the transmembrane ion flux can be inhibited effectively; and the detecting limit of the electrode is reduced tothe magnitude of 10 to 9mol / L. By taking the malachite green selective electrode as an indicator electrode and by adopting a potential analysis method, the malachite green can be detected with high sensitivity and high selectivity; and the detecting speed is quicker, the required equipment is simple, the analysis cost is low, and the field detection on malachite green can be realized.

The invention discloses a melamine selective electrode and a preparation method thereof, and the electrode comprises a substrate electrode which is coated with a poly-o-toluidine (POT) membrane on the surface, a polymethyl methacrylate-dimethylaminoetyl methacrylate (PMMA-PDMA) sensitive membrane with an electroactive substance, a glass cannula, epoxy resin, and a wire. The melamine selective electrode provided by the invention has an all-solid-state form, uses a PMMA-PDMA copolymer membrane without any plasticizer to overcome the disadvantages of a traditional PVC membrane of difficult adhesion, easy leakage, poor thermal stability, and the like, uses a POT membrane to inhibit the water layer formation between the sensitive membrane and the substrate electrode, and has the advantages of being stable in measuring voltage, low in detection limit, simple in structure, convenient to use, capable for miniaturization, etc. The detection of melamine in milk and dairy products by using the melamine selective electrode provided by the invention as an indicator electrode and adopting a potential analysis method has high sensitivity, good selectivity, quick detection speed, simple equipmentrequired, low analysis cost, and can realize on-site detection.

The present invention relates to chemical analysis of soil, especially relates to a method for measuring quick-acting phosphorus in soil based on image analysis. The phosphorus -containing liquid to be measured is reacted with a color reagent and the blue color is displayed. The darkness of blue can be characterized by the blue degree which is highly dependent linearly with the phosphorus content. The image averaging blue degrees of the soil liquid to be measured and the sample are obtained with the image analysis software. A linear equation between the concentration of sample and the average blue degree value of the sample is established Y=a-bX (wherein Y is the concentration of sample, X is the average blue degree value of sample, a and b are constant quantities). The average blue degree value of the liquid to be measured is substituted into the equation to obtain the phosphor concentration of the phosphorus-containing liquid to be measured. Then the content of quick-acting phosphorus in soil is calculated. The precision of the invention is higher than that of the test paper method. The operation of the invention is simpler than that of the colorimetry. Furthermore the method of the invention is suitable for the high-concentration quick-acting phosphorus in soil.

The invention discloses a device for detecting an anchoring length of a reinforcing steel of a semi-grout sleeve. The device is is characterized in that the device comprises a slurry outlet, a grouting opening, an upper member reinforcing steel, a lower member reinforcing steel, a threaded connection end, a semi-grout sleeve, a grout material, a DC dual-arm bridge, and a test contact connecting piece; the test contact connecting piece is arranged in the semi-grout sleeve and connected with the lower member reinforcing steel; a first connection point is arranged at a portion of the upper memberreinforcing steel extending out of the semi-grout sleeve; a second connection point is arranged at a portion of the lower member reinforcing steel extending out of the semi-grout sleeve; the DC dual-arm bridge is connected with the first connection point and the second connection point through wires. The test contact connecting piece does not affect the grouting quality, the external DC dual-armbridge can display the resistance reading when the circuit is switched on so long as the anchoring length of the reinforcing steel is sufficient, so that on-site detection for the anchoring length ofthe reinforcing steel of the semi-grout sleeve is realized.