8results about How to "Short measuring cycle" patented technology

The utility model relates to the technical field of atmospheric science detection equipment, in particular to a CCN counter airflow control system with a high-precision flow regulation function, which comprises a high-precision flow regulation valve, a cloud condensation nucleus counter, an optical particle counter, an air storage bottle and an exhaust bottle. Compared with the prior art, the device has the advantages that the condensation nucleus counter, the optical particle counter and the high-precision flow regulating valve are arranged, so that the air inlet flow can be quickly changed, different supersaturation degrees can be generated, the measurement period is shortened, meanwhile, the advanced flow regulating technology and the flow stabilizing device are adopted, the stability and the uniformity of airflow are ensured, and the measurement accuracy is improved. The control device is electrically connected with the flow sensor and the temperature and pressure compensation module, so that the control system can quickly change the air inlet flow, the response time is shortened to the second level, and compared with a traditional method, the measurement speed is greatly increased, and the cloud condensation nucleus number concentration measurement is more accurate; and more reliable data support is provided for atmospheric scientific research.

The utility model relates to the technical field of measuring tools for civil engineering, and discloses a multifunctional measuring tool for civil engineering, which comprises two first measuring rulers, and a mounting mechanism and a moving mechanism are arranged at the tops of the two first measuring rulers. The measuring tool can synchronously measure instruments in a construction site up, down, left and right at the same time, so that a constructor can effectively obtain more information about a measured object, and the overall accuracy of measurement is remarkably improved; the measuring tool is installed by adopting a plurality of detachable measuring rulers and has certain portability, so that the measuring rulers can be easily carried, the measuring period is shortened, and the measuring efficiency is improved; meanwhile, the measuring tool can carry out multi-angle measurement, so that measurement results under different visual angles can be better verified, possible errors can be found and corrected in time, the overall measurement precision is improved, and the measuring tool is suitable for different site construction environments.

The invention discloses a threshold voltage drift and recovery monitoring circuit for a gallium nitride power device under various electric stresses, and relates to the technical field of gallium nitride power device testing. The circuit comprises a power supply module, a driving chip, a switch tube S1, a switch tube S2, a gallium nitride device to be measured, a load resistor R1, a discharge diode D1, an energy storage capacitor C2 and a voltage monitoring unit, and through on-off combination of the driving module and the MOS tube S2, measurement of device threshold voltage drift and recovery after three stresses (gate stress, off-state drain stress and switch stress) can be realized. A resistive load method is adopted, triangular wave grid voltage is generated by means of an energy storage capacitor, drain-source voltage and grid-source voltage are synchronously monitored to achieve threshold voltage extraction, and a precise source table is not needed; rapid discharging is achieved through the discharging diode, and the mode switching efficiency is improved. The circuit has the advantages that the threshold voltage drift test of a device under three typical stresses when the device works in an actual converter can be simulated, in addition, compared with the traditional threshold voltage drift test, the circuit can also realize the recovery test after the threshold voltage drift of the device, and the test efficiency is improved. The method has great value for fully researching the threshold voltage drift recovery characteristic of the device under the typical working condition.

The invention provides an intelligent steering wheel force characteristic measuring device, and belongs to the technical field of aviation assembly, and the device specifically comprises a support which is fixedly installed on a longitudinal shaft of a steering wheel; the driving motor is mounted on the bracket; the two fixing frames are both connected with the output end of the driving motor, and the two fixing frames are detachably connected with a grab handle of the steering wheel; the angular displacement sensor is installed on the support, a rotating shaft of the angular displacement sensor is coaxially connected with an output shaft of the driving motor, and the deflection angle of the steering wheel is detected; the torque sensor is mounted on the output shaft of the driving motor and used for detecting the torque of the output shaft of the driving motor; the output shaft of the driving motor and the rotating shaft of the steering wheel are coaxially arranged, the driving motor drives the two fixing frames to rotate and then drives the steering wheel, and through the processing scheme of the application, the measurement period is shortened, and the measurement accuracy and the repetition precision are improved.

The invention discloses an inner and outer contour measuring device, which relates to the technical field of measuring devices and comprises a cradle assembly, a Y-axis sliding table, an outer contour measuring assembly, a first Z-axis sliding table, an X-axis sliding table, an inner contour measuring assembly and a second Z-axis sliding table. The cradle assembly comprises a product clamping assembly, a cradle body, a cradle support and a cradle driving device. The Y-axis sliding table is used for driving the cradle base to slide in the Y-axis direction. The outer contour measuring assembly is used for measuring the outer contour of the product. The first Z-axis sliding table is used for driving the outer contour measuring assembly to slide in the Z-axis direction, and the X-axis sliding table is used for driving the first Z-axis sliding table to slide in the X-axis direction. The inner contour measuring assembly comprises a climbing needle sensor which is used for measuring the inner contour of the product. The second Z-axis sliding table is connected with the inner contour measuring assembly and used for driving the inner contour measuring assembly to slide in the Z-axis direction. According to the device, measurement of the inner contour and the outer contour is completed through one-time clamping, equipment replacement is avoided, and a structural basis is provided for subsequent data fusion.

This invention discloses a device and method for measuring the water content and wet / dry density of water-saturated sediments, comprising: a control console with two sets of columns symmetrically fixedly connected to the top of the console; two lifting mechanisms; a clamp seat positioned between the two sets of lifting mechanisms; a measuring assembly including a base, an inner cylinder, and an outer cylinder, with a balance hole at the top of the inner cylinder and a water storage tank between the inner and outer cylinders, and a weighing unit installed at the bottom of the water storage tank; a drying system installed on top of the two sets of columns; and a control system for controlling the operation of the entire device. This invention features a compact overall structure, with the columns and lifting mechanisms providing stable support, ensuring safe and reliable operation, and meeting the measurement needs of various laboratory scenarios.

The invention discloses a high-precision delay measurement system, and the system comprises a light source which is used for generating a light pulse signal with repetition frequency; the pulse width stretcher is used for stretching the optical pulse signal in a time domain so as to form a linear chirp signal; the beam splitter is used for splitting the linear chirp signal into a first optical signal and a second optical signal; the Mach-Zehnder interferometer comprises a first interference arm and a second interference arm connected to the delay line to be measured, the first interference arm is used for enabling the first optical signal to pass through, and the second interference arm is used for enabling the second optical signal to pass through; the beam combiner is used for enabling the first optical signal and the second optical signal to interfere so as to combine the first optical signal and the second optical signal into an interference optical signal; the photoelectric detector is used for converting the interference light signal into a corresponding electric signal; the oscilloscope is used for collecting the time shift of the interference waveform of the electric signal; and calculating the delay of the delay line to be measured according to the collected time shift. According to the method, a brand new measurement mechanism is established, so that the inherent measurement precision stably reaches the femtosecond magnitude.

This invention discloses a haze testing method for anti-glare films, relating to the field of film testing technology, for detecting the internal and external haze of anti-glare films. The method uses a film layer testing structure comprising an anti-glare film layer and an auxiliary testing layer that can be directly adhered to the anti-glare film layer. The anti-glare film layer has an uneven anti-glare surface formed by anti-glare particles; the auxiliary testing layer has a flexible adhesive surface that can be directly adhered to the anti-glare surface, and is light-transmitting. The testing method provided by this invention simplifies the measurement steps and saves measurement time by selecting an auxiliary testing layer that can be directly adhered to the anti-glare film layer and whose refractive index matches it, thus forming a film layer testing structure for testing. Simultaneously, by controlling parameters such as the adhesion angle between the auxiliary testing layer and the anti-glare film layer, the adhesion quality can be effectively controlled, avoiding defects such as air bubbles on the adhesion surface.