Detector optical machine assembly integrated with photosensitive surface conjugate diaphragm

Abstract

The invention discloses a detector optical machine assembly integrated with a photosensitive surface conjugate diaphragm, which is structurally characterized in that a photosensitive surface (2) of a detector (1) and a diaphragm aperture (5) of a diaphragm (4) are respectively positioned on an object surface and an image surface of a projection optical system (3) and are in one-to-one correspondence according to an imaging relationship. The detector (1), the projection optical system (3) and the diaphragm (4) are assembled on the same mounting structure (6) to form an integral optical machine assembly; the device is simple in structure, easy to install and adjust, accurate in object-image relation and firm and reliable in whole, the small hole can filter out adverse effects generated by external stray light, and the size of a detection area can be adjusted and the receiving view field of the photosensitive unit can be changed by configuring the sizes of the projection optics (3) and the diaphragm small hole (5) and system parameters; and the light source can be used as a receiving optical axis basis for the optical axis adjustment of the active photoelectric system, so that the subsequent complete machine adjustment is facilitated.

Description

Technical field [0001] The present invention belongs to the field of active lidar technology, relates to a detector optical machine assembly integrating a photosensitive surface conjugated diaphragm. Background [0002] Active photoelectric detection radar systems are mostly weak light signal detection, which has strict requirements for various types of noise suppression. When strong background light or close-range backscattered light is incident on the structure in the receiving optical path, it will produce a complex diffuse reflection stray light in the direction of propagation, and the stray light that is incident to the photosensitive surface will significantly reduce the signal-to-noise ratio of the received signal, and even cause the detector to be in saturation work, seriously interfering with the normal work of the detector. At present, in the single-cell laser ranging radar system, it is often set in the first image position of the receiving optical path to limit the re...

AI Technical Summary

Problems solved by technology

When strong background light or short-distance backscattered light is incident on the structure in the receiving light path, it will produce stray light with complex diffuse reflection in the propagation direction, and the stray light incident on the photosensitive surface will significantly reduce the signal-to-noise ratio of the received signal, even Cause the detector to work in saturation, which seriously interferes with the normal operation of the detector

At present, in the single-pixel laser ranging radar system, a small aperture of the diaphragm is often set at the position of the first image plane in the receiving optical path to limit the receiving field of view of the system, reduce the influence of background light and shield all kinds of stray light, and then use A group of lenses corresponds the diaphragm to the photosensitive surface of the detector in space according to the relationship between the object and the image; while the multi-element array active photodetection system has many discrete receiving fields of view, the alignment of the multi-element laser emission and the optical axis of the corresponding receiving field of view is cumbersome and complicated. , generally only one field diaphragm that can include all detection units at the same time is set to simply eliminate the influence of stray light, or such as the common multi-line scanning imaging lidar with a working distance of less than 500m does not set a diaphragm at all

[0003] The prior art closest to the present invention is that in general long-distance laser distance measuring systems, a pinhole diaphragm is placed at the position of the first image plane in the receiving light path, and then the pinhole and the photosensitive surface of the detector are pressed together by a lens group. The relationship between objects and images corresponds in space, and the detector, optical system and diaphragm are installed separately, and the aperture diaphragm, projection optical system, and photosensitive surface of the detector are not integrated into an independent whole, so that the optical axis of the whole system is aligned The adjustment process is complicated and cumbersome, and it cannot be applied to multi-element array detection systems

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