| 摘要 |
<p>It comprises a tube (2) having an open end and a closed end (4), a piston (6) mounted slidably in the tube (2) in order to delimit with the closed end of this tube a chamber (8) of variable volume, a means (9, 50, 50a, 50b) for ensuring sealing between the tube (2) and the piston (6), a compressible oil contained in said chamber (8) of variable volume, and a means (10, 12, 18) for measuring the displacement of the piston in relation to the tube. The means for measuring the displacement of the piston in relation to the tube comprise a linear potentiometer having a track (12) connected to the piston (6) and a slide (18) connected to the tube (2), electrical connecting wires connecting the slide and the ends of the track to means for measuring the electrical resistance between the slide (18) and each of the ends of the track (12). <IMAGE></p> |
