31results about How to "Low measurement disturbance" patented technology

The invention relates to a test device and test method for measuring heat-state mechanical performance of a safety valve. A steam source is provided through a boiler, the pressure of an energy storage 3 is larger than that of an experimental container 4, rapid supplementing and cutting off of the steam of the experimental container of the safety valve can be achieved through a large-diameter adjusting valve, stable emission of the safety valve is kept, meanwhile, a rapid air release valve is controlled, and frequency hopping in the test process of the safety valve is avoided. According to a laser measuring device, the opening state test with the measuring precision of 10ms of the safety valve can be achieved, a non-contact type electromagnetic device measures the open high numerical value of the safety valve, and a high-pressure steam pressure measuring device measures pressure of the experimental container. Different scanning periods are set in the test state and the preparing state of the safety valve through the control system, mechanical performance relevant parameters of the safety valve are precisely measured, and the data handling capacity is also considered. The test device and test method of the heat state of the safety valve have the advantages of preventing frequency hopping of the safety valve, being high in measuring precision, high in safety, stable in system running and high in automation degree.

The invention provides a technical scheme of a vibration measurement device for a laser interference rotor and a measurement method thereof. The scheme can simultaneously detect bending vibration and torsional vibration of a high-speed rotor based on beat frequency generated by laser Doppler effect, realizes frequency modulation measurement of a vibration signal under the condition of not using an expensive frequency shift device, and precisely distinguishes the directions of bending vibration and torsional vibration, has very strong anti-environment disturbance capability, and is low in manufacturing cost. The scheme belongs to non-contact measurement, the motion state of the to-be-measured rotor is free from interference, the accuracy in measurement is high, the response speed is fast, the dynamic range is wide, and the measurement can be performed at a further distance. The processing error of the rotor and measurement interference of torsional vibration and bending vibration from other vibration states are small.

The invention discloses a carbon sink fishery monitoring device. The carbon sink fishery monitoring device comprises an inverted cover body with a downward opening, wherein a carbon dioxide detection and collection assembly which can be used for detecting the concentration of carbon dioxide inside and outside the cover body is arranged at the upper part of the side surface of the cover body in a penetrating manner; an air charging and discharging device which can be used for charging air into the inner side of the cover body and discharging the air from the cover body is arranged on the cover body. Air above a tested water surface is isolated from the outside through the inverted cover body. The internal air of the cover body is extracted by the carbon dioxide detection and collection assembly in different time periods according to test requirements for carbon dioxide concentration detection, and is sampled and stored for further analysis. Therefore, the carbon sink fishery monitoring device has the advantages of novel structure and small measurement interference, has a repeated sampling function, and can automatically reset a test environment.

The invention relates to the technical field of measuring the weight center of gravity of an unmanned aerial vehicle, and discloses a weight center of gravity measuring device which comprises a connecting piece used for being connected with the unmanned aerial vehicle; the roller mechanism is provided with a fixing part and a roller part, the fixing part is used for being connected with the connecting piece, and the fixing part and the roller part are connected through a rotating pair or a spherical pair or a rolling pair; the bearing piece is provided with a bearing part and a supporting part, and the bearing part is used for bearing the roller mechanism and is connected with a roller part of the roller mechanism through a rolling pair; the bottom of the bearing part is fixedly connected with the supporting part; the weighing sensor is used for being connected with the supporting part and measuring the unremembered weight; and the jacking mechanism is used for fixing the weighing sensor and adjusting the height of the weighing sensor. The interference of the lateral force generated by the stress shape edge of the unmanned aerial vehicle on the measurement accuracy of the weight center of gravity is avoided.

The invention discloses a soil multiparameter sensing measurement system which comprises a sensor, a data acquisition processing unit and a power supply part. The sensor comprises a probe circuit, middle stainless steel tubes and peripheral stainless steel tubes, wherein the middle stainless steel tubes and the peripheral stainless steel tubes are fixed through a printed circuit board (PCB). The power supply part is a power supply circuit and comprises a heat source constant flow source and a system voltage stabilization source which provides power for the whole system. The soil multiparameter sensing measurement system can acquire data of multiple parameters of soil simultaneously and effectively solves the problem that simultaneous measurement cannot be achieved in soil physics. Besides, by utilizing a frequency dispersion method to measure soil water content, interference to measurement of the soil water content caused by factors such as the soil temperature and salt content can be effectively reduced, the application range of the sensor is expanded, and measurement accuracy of the soil water content is improved. The head of the sensor adopts the specially-designed PCB, so that connection matching between the probe circuit and a probing needle is effectively achieved, the microwave reflected value is reduced, the measurement accuracy is improved, and maintenance of the sensor and replacement of the probing needle are facilitated.

The invention discloses a wireless sea-area carbon sequestration value monitoring buoy. The wireless sea-area carbon sequestration value monitoring buoy comprises a cover body arranged in an inverted mode, wherein the cover body is provided with an opening facing downwards. A carbon dioxide detection and collecting assembly capable of detecting the carbon dioxide concentration of the interior of the cover body and the carbon dioxide concentration of the exterior of the cover body penetrates through the upper portion of the lateral side of the cover body; the cover body is further provided with an air inflow and outflow device capable of conveying air into the inner side of the cover body and discharging the air out of the inner side of the cover body. Air above a water surface to be tested is isolated from the outside by the cover body arranged in the inverted mode. The air of the inner side of the cover body can be pumped at intervals by the carbon dioxide detection and collecting assembly according to testing requirements so that carbon dioxide concentration detection can be carried out, and the air is sampled and stored for further analysis. In this way, the wireless sea-area carbon sequestration value monitoring buoy has the advantages of being novel in structure, small in measurement interference and capable of sampling the air several times and automatically resetting the testing environment.

The invention provides an oil film drift simulation device, comprising: a central component, four side components arranged outside the central component, and four corner components arranged outside the central component; the central component, the side components and The corner components all include a main structure, the main structure includes a component chassis, a component panel and a component cover plate, and a "well"-shaped storage compartment is provided in the component inner cavity, and the "well"-shaped storage compartment divides the concave part Divided into nine compartments. The oil film drift simulation device of the present invention makes up for the limitation that the existing oil spill simulation can only rely on numerical simulation or water tank simulation, and provides analysis results more suitable for the actual environment for oil spill environmental impact assessment.

The invention belongs to the technical field of unmanned aerial vehicles, and discloses an inertial measurement device, which includes a casing, a sensing component and a shock absorbing component installed in the casing, and the sensing component includes an integrated circuit board and an inertial sensor connected to the integrated circuit board and The air pressure sensor; the shock absorbing assembly includes a first shock absorbing pad, a first weight increasing block, a second weight increasing block and a second shock absorbing pad which are connected in sequence; The accommodating cavity of the integrated circuit board, the accommodating cavity accommodating the inertial sensor and the air pressure chamber accommodating the air pressure sensor and communicating with the outside are arranged on the first weight block. By setting the accommodating cavity and the air pressure chamber on the first weight block, on the one hand, it can provide a space for placing the inertial sensor and the air pressure sensor, so that the whole inertial measurement device can be more integrated; on the other hand, it can reduce the impact of external factors on the inertial sensor and The measurement interference of the air pressure sensor improves the measurement accuracy of the inertial measurement device.