Abstract: A stretchable optical sensor that can detect multiple modes of deformation and contact, including pressure, strain, and bending. The method of operation involves a waveguide and a flexible housing, in one embodiment made of silicone rubber. The interface between the two is a reflective layer that encapsulates light propagating through the channel. As the sensor is stretched, compressed, or bent, cracks within the reflective layer form and allow light to escape, resulting in a linear changes to the signal response.

Abstract: An annular seal may include a seal body configured for disposing around a rotor, a plurality of grooves and a plurality of projections formed on an inner circumferential surface of the seal body, and a plurality of dams circumferentially disposed on a first surface of the seal body. The first surface may extend radially from the inner circumferential surface of the seal body. The plurality of dams may be configured to increase a pressure of a working fluid contacting the plurality of dams such that the increase in the pressure may center the annular seal about the rotor.

Abstract: An annular seal may include a seal body configured for disposing around a rotor, a plurality of grooves and a plurality of projections formed on an inner circumferential surface of the seal body, and a plurality of dams circumferentially disposed on a first surface of the seal body. The first surface may extend radially from the inner circumferential surface of the seal body. The plurality of dams may be configured to increase a pressure of a working fluid contacting the plurality of dams such that the increase in the pressure may center the annular seal about the rotor.