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Spectrophotometer Optical System for Liquid Samples

IP.com Disclosure Number: IPCOM000085088D
Original Publication Date: 1976-Feb-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 2 page(s) / 52K

Publishing Venue

IBM

Related People

Durham, OG: AUTHOR [+3]

Abstract

Spectrophotometers have been designed in which liquid samples contained in test tubes are sequentially moved through a test station, in which a beam of light is passed through each sample. The light is collected and analyzed to determine characteristics associated with the sample. Many systems require that the test tubes or other vessels for holding the liquid samples be of an optical quality having a minimum of irregularities that might adversely effect the measurements.

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Spectrophotometer Optical System for Liquid Samples

Spectrophotometers have been designed in which liquid samples contained in test tubes are sequentially moved through a test station, in which a beam of light is passed through each sample. The light is collected and analyzed to determine characteristics associated with the sample. Many systems require that the test tubes or other vessels for holding the liquid samples be of an optical quality having a minimum of irregularities that might adversely effect the measurements.

Shown in the drawing are two optical systems that can be used with lower quality vessels and wherein, in both instances, the vessel and liquid sample form part of the optical system.

In Fig. 1, liquid samples 10 in clear glass test tubes 11 are moved along the direction of arrow A through a test station, at which point each sample is stopped so that a measurement may be taken. To do this, a beam of collimated light 12 of circular cross section is directed onto a semicylindrical lens 13 that changes the beam to one of elliptical cross section 14. This beam is directed onto and through test tube 11 and sample 10 where these elements act as a lens themselves to further focus the beam, which is now of a slightly vertical, elliptical cross section 15, on the entrance of a fiber optic bundle 16 operative to direct the collected light to a monochromator. The distance between lens 13 and the test tube 11 may be varied, such as by moving lens 13, so tha...