Method and device for checking resolution of holographic diffraction low-light night vision device

Abstract

The invention relates to a holographic diffraction type method and device for detecting low-light level night vision device resolving power. The device comprises a target board image generating system and a power source and control system. The method comprises the working procedures that a man-machine interaction unit sends an order to a single chip microcomputer, the single chip microcomputer outputs a PWM pulse according to the order, a semiconductor laser is controlled by a power stabilizing unit to output luminous power of the predetermined calibration value, and the luminous power is kept stable. After a laser beam passes by a plane reflecting mirror and a collimation reflecting mirror, the parallelism of the laser beam is rectified, the laser beam is emitted to a reflection diffraction grating, parallax elimination is carried out on the laser beam, the laser beam is irradiated to a holographic photographic plate with an incident angle equal to a reference light angle when the holographic photographic plate is recorded, and a resolving power target board virtual image reappears at the infinity position in front of the holographic photographic plate so that a user can detect the low-light level night vision device resolving power. The laser holographic reappearance principle is applied, the folding optical path design is adopted, the method is unique, practical and effective, and the device is small in size, convenient to carry and suitable for fast detecting and identifying the low-light level night vision device resolving power under the field condition.

Description

Technical field [0001] The invention belongs to the field of performance detection of low-light night vision devices, and specifically relates to a method and device for qualitatively checking the resolution of low-light night vision devices by using laser holographic diffraction technology. Background technique [0002] The resolution of the low-light-level night vision device is the ability of the instrument to distinguish the details of the target, and it is one of the important indicators for evaluating the imaging quality of the low-light-level night vision device. At present, there are two main methods for checking the resolution of low-light night vision devices: one method is the actual target method, that is, in a dark room with set conditions, the low-light night vision device is directly used to observe the standard reflective resolution target board. The other method is the collimator method, which is to place a resolution target plate with the contrast, illuminance a...

AI Technical Summary

Problems solved by technology

Due to the harsh conditions in the darkroom and the large volume of the collimator, which is inconvenient to carry, the above two methods are not suitable for the needs of field work.

At present, there are no mature methods and devices for rapid detection and identification of the resolution of low-light night vision devices under field conditions.

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