Sapphire single crystal is widely used in weapons, aerospace and other fields because of its high hardness, high temperature resistance and excellent optical properties. The surface topography of sapphire grinding has an important influence on its subsequent processing and service performance. Aiming at giving consideration to machining efficiency and surface quality, this paper puts forward a high-efficiency ultra precision machining scheme of sapphire by using ultra precision five axis machining center machine tool and diamond grinding wheels with different particle sizes to realize efficient removal of crystal materials and obtain high machining surface quality. Through experiments, the effects of different grinding process parameters on machined surface roughness and material removal rate are studied. The surface roughness and surface morphology of sapphire ground by diamond grinding wheel are detected by metallographic microscope and touched optical measuring instrument. The test results show that the feed speed of grinding wheel has the greatest influence on the surface quality and roughness and material remove rate, the rotation speed of grinding wheel takes the second place, and the rotation speed of substrate has little influence; Reducing the grinding particle diameter of grinding wheel is helpful to improve the machined surface quality.
With the science technology development, Electro-optical devices requires higher demands for optical lens. Less than 10mm small-sized cylindrical lens were fabricated and inspected. With conventional methods, custom designed fixture, cylindrical lens satisfies the designed demands were fabricated on classical polishing machine. A reliable processing procedure was acquired, which can guide the operator successfully fabricate the lens, and also be reference to the fabrication of similar optical lens.
According to the requirements of the military optoelectronic system for the application of the reflector, optical processing experiments were carried out on the SiCp/Al coating nickel phosphorus alloy plane mirror; The optical properties of the SiCp/Al and several commonly used optical materials were compared; The turning test and polishing test of uncoated nickel-phosphorus and nickel-phosphorus-coated aluminum-based silicon carbide were carried out, the optical processing of φ150mm SiCp/Al coating nickel-phosphorus alloy plane mirror was realized, and the high quality and high precision optical surface was obtained. The RMS value of surface accuracy was 1/27λ(λ=632.8nm), The surface roughness Ra was better than 3.3nm, which confirmed the feasibility of using SiCp/Al composites in military optoelectronic systems and met the requirements of precision of the reflector.
Aiming at the processing of infrared optical parts and the adjustment of infrared optical system, key links, such as surface shape change, optical axis deviation, etc and influencing factors were analyzed in detail caused by internal defects and stress of Infrared optical parts, differences in material properties and adjusting tightening force from the aspects of optical processing and opto-mechanical adjustment, whose influence on the final performance and quality of the infrared system was pointed out. On this basis, the problems existing in the current manufacturing process of the infrared optical system were sorted out, and the related technology which was needed to be carried out and the content of continuous attention were put forward to realize the refinement and parameterization of infrared system process control, and improve the manufacturing performance and quality of infrared optical system.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.