Mr. Lei Xiao Profile

Lei Xiao

at Beijing Institute of Technology

SPIE Involvement:

Author

Publications (3)

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 | 27 March 2022 Paper

An optical system design of aircraft landing signal lamp

Lei Xiao, Hang Qu, Jun Zhang, Zhidong Zhao

Proceedings Volume 12169, 121693M (2022) https://doi.org/10.1117/12.2623792

KEYWORDS: Lamps, Optical design, Glasses, Microlens array, Light sources, Light, Light emitting diodes, Waveguides, Visible radiation, Visual optics

Read Abstract +

The aircraft landing signal lamp is a kind of optical equipment which provides the pilot with visual landing optical indication. It is installed on the apron of the airport. The aircraft landing signal lamp is usually installed on the aircraft landing sign line. To ensure the safety of aircraft taking off and landing, the height of the lamp after installation should not exceed 30mm. Aircraft landing lights need to provide 360 degrees of horizontal direction, 7 degrees to 90 degrees of vertical direction, and the power should not be too large, therefore, the optical system is required to have a reasonable light distribution curve, high light utilization rate. Because pilots are equipped with night vision equipment at night, landing lights need to provide a near-infrared light signal as well as visible light. To make aircraft take off and land safer, this paper designs an optical system of aircraft landing signal light based on the principle of light guiding optics, which makes the upper surface of the lamp flush with the mounting surface. The height of the lamp after installation is 0mm. The optical system consists of LED integrated surface light source and light guiding glass column. Integrated surface light source integrates visible light LED chip and near infrared LED chip together. To make the light Angle larger and the light distribution curve more reasonable, the upper surface of the light guide glass column is in the form of microlens array. At the end of this paper, a photo of the optical indication effect of aircraft landing signal light is given.

Proceedings Article | 19 November 2019 Paper

Design of the illumination optical systems of the washing floodlight

Lei Xiao, Jun Zhang, Xiaojie Zhu, Hang Qu, Bin Gao, Yongli Zhu

Proceedings Volume 11185, 111851A (2019) https://doi.org/10.1117/12.2538405

KEYWORDS: Refraction, Reflection, Optoelectronics, Visualization, Energy efficiency, Visible radiation, Infrared radiation, Night vision goggles, Reflectivity, Mirrors

Read Abstract +

The washing floodlight is a sort of optoelectronic equipment for the use on vessels which contain helipad, designed as a visual landing aid for the helicopter. Usually the washing floodlight is installed directly on the edge of deck, while the installation site should not be too high, normally lower than 350mm is recommended. In addition, since floodlight generally provides high and relative uniform illumination for a larger deck surface, it is necessary to have a reasonable light intensity distribution, high light intensity and high light energy efficiency. Meanwhile, the floodlight need to provide not only visible light but also infrared illumination to coordinate with night vision goggle. This paper provides a washing floodlight design with high light intensity and high average illumination. The illumination optical system consists of two separate portions, namely refraction and reflective illumination optical system. The refraction illumination optical system is a cylindrical lens with free-form surface, the upper part of lens is responsible for small angle illumination (about 0° to -5 ° in the vertical direction), while the nether part is responsible for large angle illumination (about -5 ° to -30 °in the vertical direction). Besides, the reflection illumination optical system is a cylindrical mirror with scaly conicoid reflection surfaces rather than traditional smooth quadric surface, which can improve the ability to control light, providing a larger angle of uniform illumination. In the later part of this paper, the illumination performance with 8 washing floodlight is simulated, and the illumination performance picture of a real washing floodlight is given.

Proceedings Article | 21 November 2014 Paper

Design of chirped fly’s eye uniformizer for ArF lithography illumination system

Lei Xiao, Yanqiu Li, Lidong Wei

Proceedings Volume 9296, 92960P (2014) https://doi.org/10.1117/12.2072433

KEYWORDS: Eye, Lithographic illumination, Reticles, Lithography, Speckle, Speckle pattern, Cylindrical lenses, Optical components, Geometrical optics, Diffusers

Read Abstract +

Fly’s eye uniformizer is the key part of ArF lithography illumination system, whose main function is to illuminate the reticle uniformly. Due to the periodic structure of regular fly’s eye uniformizer and the high coherence of the ArF laser, the output intensity distribution is modulated with equidistant sharp intensity peaks (interference speckle pattern) which disturbed the uniformity on the reticle. In this paper, we design a chirped fly’s eye uniformizer which consists of chirped fly’s eye and a condenser for illumination system in ArF lithography system. The chirped fly’s eye consists of individually shaped micro-lenses defined by a parametric description which can be derived completely from analytical functions. The micro-lenses with different thicknesses in the chirped fly’s eye have a function of delaying the optical path which reducing the laser coherence and speckle pattern on the reticle. Detailed design process of the chirped fly’s eye uniformizer for numerical aperture (NA) 0.75 lithography illumination system is presented. Light intensity distribution on reticle produced by regular and chirped fly’s eye uniformizer are analyzed and compared by the method of wave optics, and the results show that chirped can restrain sharp intensity peaks efficiently. Furthermore, the chirped fly’s eye uniformizer has been traced in LightTools software under conventional and annual illumination modes, and the non-uniformity of the non-scan and scan direction on the reticle reached 0.75% and 1.24% respectively. The simulation results show that the chirped fly’s eye uniformizer can provide high illumination uniformity and reduce the speckle pattern efficiently without additional elements.

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