Research On Parallelism Detection Technology Of Laser Infrared Dual-Band System

With the development of modern optical technology,optoelectronic systems have been widely used in the military field.Then,the research on multi-band photoelectric tracking and measuring equipment,airborne aiming pods,airborne photoelectric radars and other photoelectric military weapons has gradually become an important trend in the development of optoelectronic devices today.Multi-optical axis systems are often used in military optoelectronic systems to detect platforms for improved detection capabilities.The consistency of the visible light axis,the infrared optical axis and the laser optical axis in the photoelectric system directly determines the accuracy of detecting and acquiring the target information,and puts high requirements on the parallelism of multiple optical axes.Therefore,the detection of optical axis parallelism has become one of the important directions of research.The multi-optical coaxial detection method is roughly divided into a projection target method,a split aperture detection method,and a large aperture parallel light pipe method.In addition to being affected by the environment,the projection target method can only perform optical axis adjustment under night or cloudy conditions.The structure of the detection system of the aperture diameter detection method is complicated,and the installation and debugging process will generate a lot of unnecessary errors;the large-diameter parallel light pipe method detection system has a large body,is not suitable for fabrication and is cumbersome,and is not suitable for field measurement.To solve the above problem,for optical axis parallelism adjustment technology,In this paper,a wedge-shaped prism optical axis fine-tuning method and a wide-band achromatic structure combined by a four-wedge prism are proposed.While achieving optical axis adjustment,minimize system dispersion introduced by wedge prisms.Designed infrared emission and laser receiving system,that proposed prism detection method was used to verify the coaxiality of multiple optical axes.To realized the adjustment of the parallelism of the optical axis of the infrared laser.In this paper,the optical axis consistency error is 24.39μrad,which is within the allowable range of accuracy.This solution simplifies the design of the optical system,compact structure,reduces the size and weight of the device,and can complete a wide range of optical axis adjustment work in a small space.