Patent ID: 8559023

Claim:
A micro-cavity measuring method based on micro focal-length collimation comprising: providing a micro-cavity detector comprising: a fiber probe comprising a probe ball, a fiber stem cantilevered at one end and with the probe ball mounted on the other end, and a collimation lens that is cylindrical or spherical and fixed to the middle of the fiber stem, the collimation lens having a micro focal length; a point source; and an optoelectronic detector that acquires images of the point source; wherein the positions of the point source, the fiber probe and the optoelectronic detector are located relatively to define a collimating and imaging optical system that transforms movements of the fiber stem into changes in the images acquired by the optoelectronic detector; using the optoelectronic detector to acquire images of the point source; introducing the probe ball into a micro-cavity work piece and moving the micro-cavity detector using a coordinate measuring machine (CMM) until the probe ball touches the micro-cavity work piece; acquiring coordinates of the points touched by the probe ball; and generating measuring results using the coordinates; wherein the images of the point source and the coordinates are acquired in real time and are processed by a computer program.