The invention relates to a beam-target
coupling sensor belonging to the field of photoelectric sensors, which overcomes the problems with conventional monitoring systems including high difficulties in design, manufacture, and assembling, high cost, high liability to undesired phenomena such as
distortion and scattering, as well as low ensurance for targeting accuracy and reliability concerning special targets. The sensor includes three monitoring elements including an upper one, an intermediate one, and a lower one, each including a CCD, a micro object lens, a
laser reflector, and an annular LED
light source for monitoring the spatial position and posture of a target. The annular LED is used for illuminating the target. An incident
laser beam on a target point is reflected onto the image surface of the CCD via the
laser reflector. A vacuum motor and a
ball screw transmission pair are used to realize focusing of the upper and lower micro monitoring systems, and an electric micro displacement platform is used to realize focusing of the intermediate micro
monitoring system. In addition to accurate and fast guiding, the invention realizes zero
impact of the target on
light beam guiding because of indirect cast of
laser light thereon, thus achieves improved adaptability to different targets.