New Method of Displaying Disturbance and Wave Propagation

Abstract

The measured phenomenon modulates in intensity a horizontal line on a CRO screen. The vertical position of this line is electrically linked with the position of the detector (e.g., photomultiplier). If the phenomenon is repeated many times while the detector slowly moves, the individual lines fuse into an intensity modulated space-time diagram, similar to a TV picture. The method quickly provides accurate and full information of even very complicated and fast wave phenomena, and increases the signal-to-noise ratio by summarizing many independent measurements into a single picture. Examples of the use of the method for measurements of ionization waves in a discharge plasma are given.

Ionization waves (striations) in a discharge plasma

“…185 , картина ионизационных волн в водороде наиболее разнообразна (но сравнению со всеми до сих пор исследованными газами). На рис.…”

Glow Discharges at DC and Low Frequencies

“…The mechanical rotating mirror is still very useful for single-shot records. However, if the transient responses of the discharge are reproducible or if statistical information is acceptable, an electronic equivalent, due to Stirand et al (1966), using a sampling technique is more convenient. The experimental requirements are illustrated in Fig.…”

“…At higher discharge currents, above the Pupp limit only one type of wave can be stimulated and Ελ is not a constant (Rayment, 1974). The occurrence of striations in the molecular gases is even more diversified and as illustration we show the existence regions for hydrogen (Stirand and Laska, 1967) (Fig. 6) and for nitrogen (Venzke, 1971 ;Laska and Exner, 1971) (Fig.…”

“…The latter is a very convenient, and economical discharge for demonstrating the properties of these waves (Lee et al, 1966). A simple arrangement using a pulse disturbance and a real or electronic equivalent rotating mirror gives an easy measure of the wave velocity and dispersion (Stirand et al, 1966).…”

Untersuchungen zum Verhalten von Ionenschallwellen in Edelgas‐Niederdruckentladungen

“…Ausbreitung einer Grundwelle und der 1. Oberwelle, I n dieseiii Zusanimenhang sind die Untenuchungen von ORNUMA und HATTA[14] interessant, die ebenfalls in einem Gasentladungsplasnla gleichartige Ergebnisse erhielten. Ihre Ylasnlaparanieter sind denen dieser Untersuchungen vergleichbar.…”