| 摘要 |
<p>Optoelectronic device for high dimensional and displacement measurements comprising a body (101), a mobile testing spike (105), whose displacements have to be measured, the said spike sliding inside the said body by means of two bearings carried by it, a contact key (106) at the end of the spike, a light source (112) and two photoreceptors (1, 2) adjacent and solidly locked to the body placed symmetrically on the one and on the other side of the spike, a mask (109) carried by the spike and situated between the source and the photoreceptors and showing opaque and transparent portions, the movement of the mask resulting in the increase or decrease, respectively, of the sensible surfaces of the two photoreceptors exposed to the light source. The device is caracterized in that the mask is substantially symmetrical with the contact key with regards to the centre point between the two bearings from which it results that the mechanical play of the spike in its bearing involves only a zero or negligible amount of variation of the difference in the lighting of the photoreceptors.</p> |
