A kind of miniature Rogowski coil which measures high frequency and heavy current is introduced,and the principle of work of Rogowski coil is analyzed.The influence of non-uniform laying of the miniature Rogowski coil,including the biased laying and the inclined laying on the electric current survey performance is discussed.In order to reduce the influence of the coil laying on the capriciousness,the coil may be wound thread or increased evenly from the integral coefficient.The Rogowski coil of the hollow multi-layer circles reduces the coil stray capacity in the manufacture process.The design project of coil is proposed,the current waveform is tested by using many kinds of structures of the coil,and the massive test data are obtained.Through comparing the overseas standard electric current test and head test data of the probe,the current coil design is improved unceasingly.The test using magnetic material can enhance the coil actually from the integral criterion function,but the used magnetic material should have saturation induction density and consider its working band.
In this paper,the vital technology of burst-mode optical transmission in the Optical Burst Switching(OBS) is analysed and the design scheme of burst-mode optical transmitter using external modulation is put forward.Its core component is MQW-EAM(Multiple-Quantum Well-Electro-Absorption Modulation),and the simulation to the driver circuit and whole circuit are performed.The method of the modulation actualizing the burst-mode optical transmitter is demonstrated and the technological indicator of burst-mode optical transmitter is summarized.
In order to improve transmission capacity of TDRSS,microwave link is used to Ka band,and laser link is used among TDRSS,according to ITU proposal.The modulation technology of transparence transmitting microwave signal over laser link is designed in the paper,including direct modulation and microwave frequency conversion modulation.Through analysis and computing,primary parameters of Ka band microwave optical modulator can be got.The feasibility of this scheme using travelling wave LiNbO3 modulator of broad band is demonstrated.Besides,advantages and disadvantages of the two schemes are discussed respectively.
Self-integral Rogowski current coil is used parallel sampling resistance in the out-port, and is selected the small magnetic conductivity copper or aluminum as the generatrix to be measured. Sampling resistance is both the signal to noise ratio to be good and avoiding to produce the oversized survey signal. The magnetic core Rogowski Current Coil should reduce inner resistance as far as possible. It is suitably selected the small temperature expansion coefficient material to take the skeleton. According to the temperature to the coil output voltage influence, the revision is carried on under the different temperature. Its shielded box should be used the main air gap and prevent the primary current to produce the magnetic field concentrating in the shield shell metal plate.
For travelling wave LiNbO3 modulator of broad band for space optical communication,signal frequency in Ka band was converted into low frequency range by using converter technique,and then,light-wave was modulated directly.The primary parameters of microwave optical modulator in Ka band were gotten through theoretical analysis,computing distributed capacitance and optimizing CPW structure.The laser link was used between tracking and data relay satellite system,and feasibility of this scheme used travelling wave LiNbO3 modulator of broad band is demonstrated.
