Dr. Kaiyu Yang Profile

Dr. Kaiyu Yang

at Kunming Institute of Physics

SPIE Involvement:

Author

Publications (2)

This will count as one of your downloads.

You will have access to both the presentation and article (if available).

DOWNLOAD NOW

This content is available for download via your institution's subscription. To access this item, please sign in to your personal account.

Email or Username Forgot your username?

Password Forgot your password?

Show

Keep me signed in

No SPIE account? Create an account

Proceedings Article | 29 December 2022 Poster + Paper

Simulation of external stray light in airborne off-axis four mirrors telescope system

Kaiyu Yang, Ning Jin, Dan Yang, Long Pu, Man Xu, Shulin Dong

Proceedings Volume 12315, 123151E (2022) https://doi.org/10.1117/12.2642646

KEYWORDS: Stray light, Telescopes, Off axis mirrors, Device simulation, Baffles, Imaging systems, Sun, Mirrors, Reflection, Mirror surfaces

Read Abstract +

The off-axis four mirrors telescope has the advantages of high image quality, high resolution and high integration, which makes it a core opti-mechanical component to adapt to the future development of multiband co-aperture airborne observation and aiming systems. The simulation and suppression of external stray light in the telescope is imperative for the airborne application since this type of systems is easily affected by strong light outside the field of view. For the asymmetry of the telescope, point source transmittance (PST) as a two-dimensional function varying with the horizontal and vertical angle of stray light was set up to evaluate the influence of external stray light. Besides, the conversion relationship between the horizontal and vertical angle and the process quantity of rotations about local coordinate axis required for opto-mechanical modeling was established. Based on that, stray light simulation model of an off-axis four mirrors telescope was constructed, then PST distribution of stray lights with different spatial angles in the whole incident hemisphere space was calculated. Furthermore, the imaging effect of long-distance scene under the influence of several stray lights with large PST peak was simulated, showing that the stray lights had great interference to airborne observation. According to the found transmission paths, the internal baffles were designed to significantly reduce the peak value of PST to reach the application indices. From the re-simulation results of the imaging effect of scene, the interference of residual stray lights was finally not obvious, which could meet the use requirements of airborne photoelectric observation and aiming system.

Proceedings Article | 5 November 2018 Paper

Monte Carlo calculation on stray radiation scattered by the baffle with a heterotypic surface for uncooled infrared system

Kaiyu Yang, Ning Jin, Dan Yang, Ling Cao, Jinjin Chen

Proceedings Volume 10815, 108150R (2018) https://doi.org/10.1117/12.2500784

KEYWORDS: Infrared imaging, Infrared radiation, Ray tracing, Monte Carlo methods, Imaging systems, Stray light, Infrared detectors

Read Abstract +

For most uncooled infrared imager, there locates a baffle between the window of detector and the last lens of the optical system to block the internal stray radiation produced by lens cone and other structural parts. On the other hand, the baffle itself also brings another infrared radiation, and it has long been identified as a serious issue. Optimizing the surface shape of the baffle by modeling and calculating the distribution of stray energy on image plane is necessary to minimize the effects of the scattered radiation on the focal plane array (FPA). The Monte Carlo (MC) method has been verified to be an effective ray tracing technology in the computation of stray light, but for the baffle with complex heterotypic surface, the calculation by this way is very complicated and costs much time. Based on previous studies, this paper will present a MC method to trace the amount of rays radiated from the outer surface of detector, scattered by baffle and directly transmitted back to the FPA. Compared with the conventional MC rays tracing method, the way of spatial mesh discretization and gradual mesh reduction is proposed to replace the way of solving equations to search the intersection point between rays and complex surface on the baffle. As a result, it has higher computational efficiency and applicability to different shape of surfaces. Accordingly, it can be applied to the optimization calculation of baffle’s surface structure.

My Library

You currently do not have any folders to save your paper to! Create a new folder below.

Folder Name

Folder Description

View contact details

UPDATE YOUR PROFILE

Is this your profile? Update it now.

Sign into your SPIE.org account

Don’t have a profile and want one?

Create an account on SPIE.org

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.

ORGANIZATIONAL
Sign in with credentials provided by your organization.

Organizational Username

Organizational Password

Show/Hide Password

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

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.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members:

Non-members: ADD TO CART

Keywords/Phrases

Search In:

Publication Years