Browse Prior Art Database

Lamp Irradiance Tester

IP.com Disclosure Number: IPCOM000090364D
Original Publication Date: 1969-Apr-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Hatsios, JG: AUTHOR [+4]

Abstract

The apparatus performs spatial irradiance tests of electric lamps. Lamp 1 is mounted in front of the integrating sphere and shines into sphere 2 through an aperture, not shown, in aperture plate 3. The light entering through the aperture is diffused about the interior in sphere 2 and is sensed by photocell 4 positioned at some point on its periphery. Sphere 2 is coated white to enhance the internal reflectance. Photocell 4 detects the average intensity of the light entering through the aperture.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 100% of the total text.

Page 1 of 2

Lamp Irradiance Tester

The apparatus performs spatial irradiance tests of electric lamps. Lamp 1 is mounted in front of the integrating sphere and shines into sphere 2 through an aperture, not shown, in aperture plate 3. The light entering through the aperture is diffused about the interior in sphere 2 and is sensed by photocell 4 positioned at some point on its periphery. Sphere 2 is coated white to enhance the internal reflectance. Photocell 4 detects the average intensity of the light entering through the aperture.

In operation, lamp 1 is rotated 360 degrees about its optical axis 0-0' by rotating knob 5 and rotatably attached housing 6. Suitable electrical connections are made at base 7 of lamp 1. The size of the aperture through which the light passes is much smaller than the size of the light pattern striking it. The geometry and position of the aperture with respect to the optical axis can be chosen to match the mechanical and filament features of the lamp. By monitoring the output of photocell 4 as the lamp is rotated, an indication of the uniformity of the light pattern is obtained.

The test apparatus is useful for testing lamps which are to be employed in environments having critical light alignment requirements.

1

Page 2 of 2

2

[This page contains 2 pictures or other non-text objects]