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Browse Prior Art Database

Spectrophotometer Head with Variable Spot Size

IP.com Disclosure Number: IPCOM000088927D
Original Publication Date: 1977-Aug-01
Included in the Prior Art Database: 2005-Mar-04
Document File: 2 page(s) / 64K

Publishing Venue

IBM

Related People

Conrad, FL: AUTHOR [+4]

Abstract

In some applications of spectrophotometers, it is desirable to analyze different size areas of a sample. For instance, in the textile industry, it is desirable to measure many textile samples using different areas of analysis. One way of doing this is to use different size apertures or masks within the system. Such devices have the disadvantage of varying the intensity of the radiant energy used for the analysis.

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Spectrophotometer Head with Variable Spot Size

In some applications of spectrophotometers, it is desirable to analyze different size areas of a sample. For instance, in the textile industry, it is desirable to measure many textile samples using different areas of analysis. One way of doing this is to use different size apertures or masks within the system. Such devices have the disadvantage of varying the intensity of the radiant energy used for the analysis.

Shown in the drawing is a head 1 for a spectrophotometer, which head allows the user to select or vary the spot size undergoing analysis and, whereby, the available radiant energy remains relatively constant. The head 1 receives light from a source 2 and transmits it through a fiber-optic bundle 3 towards a sample 4 disposed at the image plane of the head. The fiber-optic bundle 3 includes a cylindrical ferrule positioned in a tube 5. The vertical position of the bundle 3 is adjustable upon actuation of a set screw 6.

The lower end of the bundle 3 is spaced above an aspheric lens 7 which collects the radiant energy emerging from the lower end of the bundle 3 and focuses it onto the image plane so as to cover an area or size dependent upon the distance between the lower end of the bundle 3 and the lens . To achieve a specific spot size, predetermined index marks may be placed upon the bundle 3. A corrugated or threaded light baffle 8 suppresses any extraneous illumination from reaching the image plane. A plur...