Device for administering a fluid product comprising optical scanning

A device for administering a fluid product, comprising a measuring means for measuring, without contact, a position between at least two elements of the administering device which can be moved relative to each other, wherein:

• the measuring means comprises an optical sensor on a first element, said optical sensor the first element and the second element can be moved in the radial direction with respect to the longitudinal axis of the administering device, such that the distance between the first element and the second element changes when the elements are moved relative to each other.

A device for delivering a substance comprising:

• a first element moveable during operation of the device and a second element;
• and
• an optical sensor for sensing a relative movement between the elements, the relative movement providing a profile trajectory indicative of a condition associated with the device.

A device for administering a fluid product, comprising at least two elements at least one of which is moveable with respect to the other and a measuring means for measuring, without contact, a relative position of the at least two elements, the measuring means comprising:

• at least two optical sensors which are arranged with respect to each other and a first element and a second element which can be moved relative to the first element;
• and
• a different surface profile associated with each of said at least two elements, which, when at least one of the elements is moved relative to the other, provides a different predetermined profile trajectory, which can be sensed by the optical sensors.