ODG is used for the investigation of viscoelastic properties (e.g.real and imaginary part of the interfacial dilatational modulus)of liquid/gas or liquid/liquid interfaces in three different excitation modes. independently controllable for drop volume or drop area:

• Constant volume (area) mode: max. 1...2 mm axis symmetric drop shapeoscillations (viscosity dependant)
• Harmonic volume (area) mode: typically 5...20 µL constant part,dV = 0...10 µL (for viscosities < 50 mPas)- Relaxational mode: instant increase/decrease in drop volume dV = 0...10 µLfor drop shape relaxation studies (for viscosities < 5 mPas)
• Frequency range: about 0.01...25 Hz (viscosity dependant) Consisting of:- Carrier for oscillation mechanics with fine adjustment screws for the axial and horizontal positioning- Oscillation mechanics- Control electronics with frequency generator
• Dynamic surface/interfacial tension measuring range: 0.05...2000 mN/m