Efficient wavelength assignment strategy for wavelength-division multiplexing optical networks

Paramjeet Singh; Shaveta Rani; Ajay K. Sharma

doi:10.1117/1.2771580

1 August 2007 Optical design and salient features of an objective for a firefighting camera

Paramjeet Singh, Shaveta Rani, Ajay K. Sharma

Author Affiliations +

Optical Engineering, Vol. 46, Issue 8, 085009 (August 2007). https://doi.org/10.1117/1.2771580

Abstract

Thermal imagers based on an uncooled microbolometer detector are finding many applications in short-range devices because of cost effectiveness. A typical application for such a system is firefighting, by providing visibility through smoke and absolute darkness. The design of an objective lens for an infrared (IR) camera to be utilized in firefighting is described. Because of the relatively poor responsivity of the thermal detector, the objective lens is to be operated at fast f-numbers (typically f/1 or faster). The proposed camera lens is simple and lightweight, able to operate under harsh ambient conditions, gives acceptable image quality for various object distances as well as operating temperatures without any focus adjustment, and has a wide field of view and an auto-iris facility. The design constraints of such lenses are also discussed. The performance evaluation curves of the lens of the camera and a few photographs taken with the camera in a fire situation are presented. Experimental results are in accordance with the predicted values.

©(2007) Society of Photo-Optical Instrumentation Engineers (SPIE)

Citation Download Citation

Paramjeet Singh, Shaveta Rani, and Ajay K. Sharma "Optical design and salient features of an objective for a firefighting camera," Optical Engineering 46(8), 085009 (1 August 2007). https://doi.org/10.1117/1.2771580

Published: 1 August 2007

ACCESS THE FULL ARTICLE

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