38 results about "Sensitivity limit" patented technology

The invention relates to a method of preparing perfluoroelastomers. Perfluoroelastomers curable by peroxidic way having glass transition temperature lower than -10 DEG C. and an amount of -COF end groups in the polymer lower than the sensitivity limit of the method using the IR spectroscopy in Fourier transform described in the present application.

The invention discloses a testing device and method for basic structural parameters of an optical waveguide ring resonant cavity. Three reference straight waveguides with the same structure are designed on the optical waveguide ring resonator chip, and after being coupled by a fiber coupler, by testing the resonance curve of the ring cavity and the average output amplitude of the reference straight waveguide, all the structural parameters of the optical waveguide ring resonator are obtained. Specific values, including coupler coupling coefficient and additional loss, and waveguide transmission loss. The device for obtaining the structural parameters of the optical waveguide ring resonant cavity: the sawtooth wave signal generator is sequentially connected with the laser, the optical waveguide ring resonant cavity chip, the PD detector, the oscilloscope, and the computer. The invention can obtain the three basic structural parameters of the optical waveguide ring resonant cavity in a non-destructive, simple and direct manner, and provide guidance for further optimizing the design of the high-performance optical waveguide ring cavity, and at the same time, it can improve the limit sensitivity and performance of the resonant micro-optical gyroscope It has important scientific significance and application value.

The invention discloses a design method for improving the limit sensitivity of eddy current detection by changing the resonance frequency. The frequency generated by the resonance circuit is used to replace the quartz crystal oscillator in the eddy current detection instrument. The eddy current detection coil is used as the inductance part of the resonance circuit. Through this method design The eddy current detection instrument can obtain the impedance signal diagram of the resonant eddy current detection including amplitude, phase and frequency information. In addition to the working characteristics of the first generation resonant eddy current instrument, it also has the advantages of the second generation impedance plane analysis eddy current instrument. The superposition of mechanisms further improves the limit sensitivity of eddy current detection.

The invention discloses a monitoring method, device and system for an unmanned aerial vehicle. Wherein, the monitoring method includes: obtaining status information of the UAV; judging whether the UAV enters a preset sensitive airspace based on the status information, wherein the preset sensitive airspace is a pre-delineated area where the flight of the UAV is restricted; if it is judged If the UAV enters the preset sensitive airspace, the early warning information will be output. The invention solves the technical problem that the unmanned aerial vehicle flying in the sensitive airspace cannot be monitored in the prior art.

The invention discloses an access overload control method of an RAN layer in a clustered M2M network. The method comprises the following steps: (1) dividing MTC equipment in a base station into time delay sensitive equipment and time delay insensitive equipment according to a preset time delay sensitivity limit; (2) acquiring the quantity of users requesting to access in a current time slot by the base station, obtaining a corresponding pilot frequency partition ratio beta * when the total quantity of successfully accessed MTC equipment is maximum, and then acquiring the quantity of pilot-frequency resources allocated to the time delay sensitive equipment and the quantity of pilot-frequency resources allocated to the time delay insensitive equipment according to the corresponding pilot frequency partition ratio beta * when the total quantity of successfully accessed MTC equipment is maximum; (3) realizing user access by adopting an ACB mechanism according to the quantity of the allocated pilot-frequency resources by the time delay sensitive equipment, and realizing user access by adopting the ACB mechanism according to the allocated pilot-frequency resources by the time delay insensitive equipment. The method disclosed by the invention can be used for effectively increasing the access rate of the MTC equipment.

The invention relates to a measuring method and a system of electronic tag matching impedance. The measuring method of the electronic tag matching impedance comprises the steps of connecting a reader-writer, a coaxial wire, a test probe and an electric tag chip in sequence, finding out the minimum output power P0 that the reader-writer can support the electric tag chip to work, connecting a vector network analyzer, the calibrated coaxial wire, the corrected test probe and the electric tag chip in sequence, setting output power of the vector network analyzer to be the P0, obtaining a fourth echo reflected value through measurement, processing the fourth echo reflected value, and obtaining the matching impedance of the electric tag chip. According to the measuring method and the system of the electronic tag matching impedance, a resistance value of the electric tag chip in a sensitivity limit can be obtained, and therefore the antenna design of an electric tag is simplified, design time and cost are saved, and design precision is improved.