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Immersible Fiber Optic Probe

IP.com Disclosure Number: IPCOM000084874D
Original Publication Date: 1976-Jan-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 3 page(s) / 45K

Publishing Venue

IBM

Related People

Durham, OG: AUTHOR [+3]

Abstract

A probe 1 is designed to be immersed in a liquid sample 2 for the purpose of transmitting light through the liquid. The probe is connectable to a spectrometer for analysis of the light thus transmitted. Probe 1 comprises a fiber optic bundle 3 and a mirror 4 mounted a fixed distance away. Bundle 3 includes two portions 5 and 6 of grouped randomly oriented fibers.

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Immersible Fiber Optic Probe

A probe 1 is designed to be immersed in a liquid sample 2 for the purpose of transmitting light through the liquid. The probe is connectable to a spectrometer for analysis of the light thus transmitted. Probe 1 comprises a fiber optic bundle 3 and a mirror 4 mounted a fixed distance away. Bundle 3 includes two portions 5 and 6 of grouped randomly oriented fibers.

At one end, portions 5 and 6 are split and, respectively, receive light from and transmit light to the spectrometer. At the other end, portions 5 and 6 are concentric. Mirror 4 includes a flat circular portion 7 having a central circular hole 8 and a conical ring 9. The specific geometry of the probe is important and will now be discussed.

In Fig. 2, the illustrated dimensions are:

r1 = radius of inner portion 5.

r2 = radius of outer portion 6.

b = 1/2 path length.

L = diameter of 8.

c = radial width of ring 9.

d = mirror angle.

There is a dependency in the order of determination of the various dimensions. Assume first that the system has a given F-number, such as F3.5. This means that the effective focal length of the system divided by the lens aperture (f/d) equals 3.5. With such an assumption, the half-angle, which is one half of the total angle of the light dispersion, is established. For F3.5, the half- angle is 8 degrees.

Next, dimensions r1, r2 and b are established. r1 and r2 are determined from the physical size of the fiber. They are not dependent upon the F#. r1 is...