Browse Prior Art Database

Double Beam Spectrophotometer With Light Deflectors

IP.com Disclosure Number: IPCOM000085309D
Original Publication Date: 1976-Mar-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 2 page(s) / 35K

Publishing Venue

IBM

Related People

Mathisen, ES: AUTHOR

Abstract

Fig. 1 shows the construction of a light deflector (LD) and Fig. 2 shows a double-beam spectrophotometer employing a series of such light deflectors, for measuring the absorbance and fluorescence of a sample.

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Double Beam Spectrophotometer With Light Deflectors

Fig. 1 shows the construction of a light deflector (LD) and Fig. 2 shows a double-beam spectrophotometer employing a series of such light deflectors, for measuring the absorbance and fluorescence of a sample.

With reference to Fig. 1, LD comprises two back-to-back prisms 1 and 2 separated by a small space into which a liquid 3 may be displaced. The liquid has an index of refraction matching the indices of refraction of the prisms 1 and
2. Liquid 3 is contained within a solenoid pump 5 so that when the solenoid is actuated, liquid 3 is displaced into the space between the prisms and LD is in an activated condition. An air reservoir 6 allows air that is displaced by the incoming liquid 3 to be displaced into the reservoir 6 and returned to the space between the prisms upon deactivation of the solenoid 5.

When the LD is deactivated, a light beam 8 directed normal to one of the faces of prism 1 is deflected at right angles by prism 1 in direction 9. When LD is activated, light beam 8 passes directly through the LD by passing first through prism 1, through the liquid 3 between the prisms, and through prism 2.

The system of Fig. 2 uses four light reflectors LD 1 - LD 4. LD 3 is comprised of two Dow prisms that are constructed in a similar manner to that shown in Fig. 1 and use a liquid to control deflecting the beam, either in one of the prisms or allowing the beam to pass through both prisms. With LD 3, when deactivated, light is deflected within the upper prism and, when activated, light passes through both prisms.

A collimated polychromatic light beam 10 is direct...