The plasma produced by an electric discharge of helium with the pressure range 100~700 Pa in a closed cavity is diagnosed by this way at three frequencies of 6.2,6.8 and 7.4 GHz. As a comparison,the Langmuir double probe method is used at the same time.
Finally, the waveguide-microstrip double probe transition is used as the combination network, while HMC28 and TGA1141-EPU are used as amplifying units, for the actual Ka-band power combination amplifier.
In this paper,Ultrasonic testing methods are discusseed for high temperature alloy bars with diameter smaller that 16 mm,The testing results are compared which indicate that the axial line focussed double probe testing method is more effective for small bars.
The electronic temperature (T_c) and electronic density (n_c) for a Na-Ne discharged system were measured with Langmuir double probe. It was found that the n_c is proportional to laser intensity and the T_c rises as laser intensity increases.
In order to examine both magnetism and conductivity in a nanoscale area, we have developed a double probe piezodriving holder, by which microprobes can be brought in contact with the portion of interest.
In the lower polar E-region electric field and plasma density fluctuations were measured with rocket-borne instrumentation (a floating double probe system and a retarding potential analyzer) during the ROSE project.
Electron temperature and ion density are measured in an air microwave-induced plasma (2450 MHz) by means of a floating double probe.
Results obtained are discussed with plasma diagnostics such as emission spectroscopy and electrical double probe techniques.
The electron temperature Te and electron concentration ne in a cesium plasma in a low-voltage arc have been measured at an electrode temperature of 700°C using the double probe method.
The average electron temperature has been measured by using a double probe. The influence of the addition of N2, He, Xe, and that of dissharge current, gas pressure on the electron temperature were studied.
A preionzation simulation experiment has been carried out on the Belt-Pinch device, GBH-1. The electron temperature and ion density were measured by a floating double-probe. The electron temperature and ionization degree are about 4ev and 30% respectively, when the filling pressure of the working gas (H2) is below 10 mtorr.
Measurements of pksma parameters of helium and argon, e.g. the electron density, the electron temperature, relative permittvity, complex conductivity etc. using the microwave cavity perturbation method are presented in this paper. The results obtained have been compared with those of the classical Langmuir double probe method, being quite close to each other.