By inserting a quarter-wave plate. used as a light wave carrier, in front of or behind the photoelastic model in the plane polariscope. isochromatics of n +1/4 and n+3/4 order may be obtained, n being any integer.

The following units in the transmitting device have been developed: generation of pseudo random code, precise phase shift of carrier wave, carrier’s modulation by pseudo random code, amplification of amplitude and power of modulated signal and matched load.

The frequency modulation signal gotten by this arithmetic not only control the depth of frequency and modulation according to the three control word about modulation wave,carrier wave and frequency deviation but also has high distinguishing ratio which could reach 0.093Hz.

Parasitic transmission is derived from wave carrier, attenuation anddisturb are two major trouble in Parasitic transmission which are more extrudein low-Voltage power line.

Basing on the thought of one point initiating, beam splitting then converging and the cutting principle of shock wave, a model of 1 IN 2 OUT high precision explosive logic circuit was established, in which lead mild detonating fuse was used as detonation wave carrier, and function of the model was demonstrated experimentally.

This paper presents the development of technology of welding current remote control and concentrates on the principle of a stepless wave carrier welding current remote controller.

Each mm-wave fibre-wireless system demonstrated here incorporates a method for the generation and modulation of an optical mm-wave carrier, which enables the effect of fibre dispersion to be significantly reduced.

The proposed chopper modulators use a square wave carrier current for controlling the transfer of a sine wave baseband voltage from nodes Y to nodes X, and the baseband currents from nodes X to nodes Z, of the current conveyors.

When the downlink is active, the reader transmits a continues wave carrier with some small gaps for the tag to syncronise its response.

The resulting vibration signal is amplitude modulated on a 100-kHz square wave carrier.

Both evoked a pitch corresponding to the sine wave carrier, but the pitch was much stronger for ramped than for damped sine waves.

The article describes the performances of the wave-carrier transmitter for seismic exploration which is designed and manufactured by us.The wave-carrier transmitter has following technical characteristics:(1) Linear level range in channels>90 decibels.(2) The number of channels is 30.(3) The interference between channels<10~(-3).(4) It has high resistance to the interference of industrial electricity and the interference of other atmospherics.The article relates the technical approaches...

The article describes the performances of the wave-carrier transmitter for seismic exploration which is designed and manufactured by us.The wave-carrier transmitter has following technical characteristics:(1) Linear level range in channels>90 decibels.(2) The number of channels is 30.(3) The interference between channels<10~(-3).(4) It has high resistance to the interference of industrial electricity and the interference of other atmospherics.The article relates the technical approaches of realizing above mentioned aims and provides correlation records of lab analog experiments and field experiments.

By inserting a quarter-wave plate. used as a light wave carrier, in front of or behind the photoelastic model in the plane polariscope. isochromatics of n +1/4 and n+3/4 order may be obtained, n being any integer. The loci of these isochromatics, however, are disturbed by the isoclinics of 0 degree, rendering their determination to be difficult at the corresponding point in the model. By rotating synchronously the elements of the optical system the disturbance might be eliminated, but this operation is...

By inserting a quarter-wave plate. used as a light wave carrier, in front of or behind the photoelastic model in the plane polariscope. isochromatics of n +1/4 and n+3/4 order may be obtained, n being any integer. The loci of these isochromatics, however, are disturbed by the isoclinics of 0 degree, rendering their determination to be difficult at the corresponding point in the model. By rotating synchronously the elements of the optical system the disturbance might be eliminated, but this operation is rather troublesome and apt to cause error. It has been proved both theoretically and experimentally that the superimposition of an additional quarter-wave plate with the photoelastic model in the circular polariscope (either dark field or light field), with the axis of the interposed quarter-wave plate set at 0 or 45 degrees with the polarizing axis as well as the analysing axis, the disturbance due to the isoclinics can be got rid of,and sharp images of the isochromatic of n +1/4 and n+3/4 order can be obtained.

On the basis of electromagnetic transient analysis of the internal construction of electric network,using the EMTP program,this paper exactly calculates and fully analyzes the trait and reqular of voltages distribute on shield wires under the conditions ofnormal,short circuit breakdown,transmission power line switch operating,the channel strucked by linghting,etc,Mean while. It also calculates and discusses the wave carrier attenuation effected by the channel perameter vary which with the frequency in-crease,using...

On the basis of electromagnetic transient analysis of the internal construction of electric network,using the EMTP program,this paper exactly calculates and fully analyzes the trait and reqular of voltages distribute on shield wires under the conditions ofnormal,short circuit breakdown,transmission power line switch operating,the channel strucked by linghting,etc,Mean while. It also calculates and discusses the wave carrier attenuation effected by the channel perameter vary which with the frequency in-crease,using the MARTI-frequecy model of EMTP program. And obtains some profitable results.The computing method is ex-act, simple and convenient,and the discussing results have effeciently theoretical basis and reference using values for the engi-neering design and oporating discussion to the wave carrier on imulated shield wires.