360 degree optical measuring device

A method for measuring a component of a drug delivery or storage device, the method comprising:

• (i) providing a light source in an opposing relationship with an optical imaging sensor, wherein a light path is defined between the light source and the optical imaging sensor such that light emitted from the light source impinges upon at least a portion of the optical imaging sensor;
• (ii) positioning a sample component on a sample positioning stage located in the light path extending between the at least one light source and at least one opposing optical imaging sensor;
• (iii) illuminating, with the at least one light source, the sample component;
• (iv) capturing, with the at least one optical imaging sensor, an image of the component;
• (v) determining the location of a first outer edge point P1 of the captured image;
• (vi) rotating the sample component relative to the optical image sensor and the light source through a predetermined rotational distance x;
• (vii) repeating step (v) and (vi) to collect a total of n images, separated from each other by x degrees of rotation of the sample component, wherein n*x>360 degrees;
• (viii) comparing a measured position of the at least one outer edge point P1 between the captured images.