A module is provided for processing geophysical data coming from at least one geophysical sensor. Streamwise arranged aerodynamic fluid re-directing and drag-reducing features on a surface of the actuator arm modify frictional forces acting on the arm from a fluid flow created by moving the medium. The actuator adapted to actuate the carrier at the spaced actuation points and including a plurality of actuation members movably actuated via pressure supplied to the actuation members. A single element can be used as the conductor. A solid light guide path serves as an optical path of the excitation light as well as the fluorescent light.