A device and method for sensing linear displacements between a first member (101) and a second member (102) on a same axis (108). The second member (102) substantially encompasses the first member (101). To sense the linear displacements, an optical code pattern (103) is placed on the first member (101)...http://www.google.de/patents/US5371598?utm_source=gb-gplus-sharePatent US5371598 - Optical displacement sensor and method for sensing linear displacements in a shock absorber
