Flexible sensor systems and sensor mounting devices and methods are disclosed. A sensor-mounting device includes an elongate tubular body made of foam so as to be flexibly manipulatable. The body has a bore extending between front and rear ends in a longitudinal direction. A sensor is located within the bore of the tubular body. Situated within the bore of the body is an inner tube having a central bore. The sensor is protected by and located within the central bore of the inner tube. The inner tube is more rigid than the body and allows the sensor system to be poseable and fixable into many non-permanent positions.