Abb Atom Ab

Petroleum Geo-services Asa-norway

Ab Asea-atom

Pgs Seres As

Rune Tenghamn

Gunnar Molund

Magnus Zetterlund

Goran Engdahl

Dag Wikstrom

Jan Hidman

Erik Janzen

Drive assembly for acoustic sources

Acoustic transmitter

Flextensional acoustic source for offshore seismic exploration

Drive system for acoustic devices

A driving member for a diaphragm in acoustic devices includes a body with opposite recesses into which driving rods are inserted. One end of the driving rods is attached to pressure rods which directly influence the diaphragm and the other end of the driving rods makes contact with the bottom of the recesses.

Acoustic devices

Data logging at temperatures up to 200.degree. C. by optical signals sent via a 'wet' optical fiber is achieved by using as a light source device an LED having a peak amplitude wavelength at ambient temperature which is sufficiently removed from 1390 .ANG. so that acceptable transmission levels can pass through the fiber when the wavelength/temperature shift of the LED is allowed for.

System and method for self-compensating fiber-optic data transmission at

Growing community of inventors

Vasteras, Sweden

Rune Tenghamn