Large field of view fast two-dimensional scanning mirror installation structure

Abstract

The invention provides a large-view-field rapid two-dimensional scanning mirror mounting structure. The large-view-field rapid two-dimensional scanning mirror mounting structure comprises upper and lower pitching driving motors which are symmetrical relative to a long axis of a scanning mirror at a zero position, wherein the two pitching driving motors drive the scanning mirror to scan in a pitching direction by the movement with the same speed and opposite directions; the large-view-field rapid two-dimensional scanning mirror mounting structure further comprises an azimuth driving motor, an angle sensor and two linear displacement sensors; the azimuth driving motor is used for driving a crank connection rod mechanism so as to drive the scanning mirror to scan in an azimuth direction; the angle sensor is used for realizing the measurement of a pitching angle of the scanning mirror; the two linear displacement sensors are used for differentially measuring linear displacement when a pitching shaft supporting frame rotates and indirectly measuring an azimuth rotary angle of the scanning mirror. Compared with an existing two-dimensional scanning machine structure, large-view-field scanning can be realized while high-speed scanning is realized, so that a terahertz imaging detection system is practical to the application to public place safety inspection.

Description

technical field [0001] The invention belongs to the technical field of terahertz detection and imaging, and relates to the problem of increasing the scanning speed under the condition of a large detection field of view in detection and imaging, in particular to a fast two-dimensional scanning mirror installation structure with a large field of view. Background technique [0002] In the field of terahertz imaging detection, due to the limitation of the field of view of the optical system itself and the key technology of the large area array terahertz detector has not yet broken through at this stage, it is necessary to use a mechanically driven two-dimensional scanning mechanism to expand the field of view of the system. In order to complete the rapid scanning imaging of the target. The existing frame-type scanning structures directly driven by motors are mostly used in large field of view and low-speed situations. Direct drive has high requirements on motors, making it diffi...

AI Technical Summary

Problems solved by technology

The existing frame-type scanning structure directly driven by the motor is mostly used in large field of view and low-speed occasions. Direct drive has high requirements on the motor, and it is difficult to achieve high-speed scanning. The imaging time is long, and it is difficult to realize the imaging detection of moving targets.

However, although the existing fast scanning mirrors driven by piezoelectric ceramics or voice coil motors have a relatively high scanning speed, their field of view is relatively small (usually only a few minutes), which is far from meeting the needs of terahertz imaging detection technology under large field of view. needs

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