Low-Level Photometric Standards

F. A. Garforth

doi:10.1117/12.956607

4 April 1979 Low-Level Photometric Standards

F. A. Garforth

Proceedings Volume 0146, Light Measurement in Industry; (1979) https://doi.org/10.1117/12.956607
Event: Light Measurement in Industry I, 1978, London, United Kingdom

Abstract

There is an extensive and increasing demand for photometric measurements on low level light sources. To make such measurements low intensity standards are required. The tungsten filament lamps which form the normal standards of luminous intensity have a minimum useable intensity of the order of one candela. For low level photometry a standard lower than this by several orders of magnitude is required. The normal methods of photometric attenuation are either insufficiently powerful or have other serious drawbacks. For these reasons a device using a neutral white diffusing surface and a small calibrated aperture is used. It will give an intensity attenuation of up to the order of 106 times.

Citation Download Citation

F. A. Garforth "Low-Level Photometric Standards", Proc. SPIE 0146, Light Measurement in Industry, (4 April 1979); https://doi.org/10.1117/12.956607

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