Dual-field-of-view infrared thermal imager

Abstract

The invention discloses a dual-field-of-view infrared thermal imager comprising a front lens assembly, a movable lens assembly, a rear lens assembly and an infrared detector. Optical axes of the front lens assembly, the movable lens assembly, the rear lens assembly and the infrared detector coincide with one another, the movable lens assembly is fixedly arranged on a motorized translation stage and capable of moving along the optical axis direction, an infrared detector is fixedly arranged on a precise mechanical sliding table and capable of moving along the optical axis direction, and movement precision of the precise mechanical sliding table is higher than that of the motorized translation stage. When the movable lens assembly is driven by the motorized translation stage to switch fields of view, the infrared detector can be fixedly arranged on the precise mechanical sliding table with movement precision higher than that of the motorized translation stage as being smaller and lighter than the movable lens assembly, so that the infrared detector can perform precise focusing, and imaging of the dual-field-of-view infrared thermal imager is clearer.

Description

technical field [0001] The invention relates to an infrared thermal imager. More specifically, it relates to a dual-field infrared thermal imager. Background technique [0002] Infrared thermal imaging cameras are more and more widely used in military, paramilitary, and civilian fields. Applications in many fields require infrared optical systems to work in multiple focal length modes to complete the thermal imager's search, aiming, and tracking functions for targets. The fixed-focus system is difficult to meet the needs. The continuous zoom system is the best choice, but it is more difficult to design. The dual-field infrared optical system is a simple and practical way to achieve the above requirements. Among them, the large field of view or low The magnification mode can be used to observe a large scene area and search for suspected targets, and the small field of view or high magnification mode can be used to carefully observe or zoom in on the target, and identify, tra...

AI Technical Summary

Problems solved by technology

The characteristics of this type of optical system are that there are no moving optical elements in the narrow field of view optical path, the optical axis of the optical system has good stability, the system switching time is short, and the transmittance is high; the problem is that a group of lenses is in an idle state outside the optical path , the use efficiency of the lens is not high, and a large space is required when the lens is switched, so the lateral size of the optical system is large

The current dual-field-of-view thermal imaging cameras obtain clear imaging by adjusting the axial position of the zoom group again, which requires a fine-tuning mechanism superimposed on the double-fold focusing mechanism, so that the mechanical structure of the focusing Very complicated, low precision focusing

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