Liquid measurement cell having a pressurized air cavity therein

Details Liquid measurement cell having a pressurized air cavity therein Liquid measurement cell having a pressurized air cavity therein

2006-12-05

2009-06-02

Chowdhury, Tarifur (Department: 2886)

Optics: measuring and testing

For light transmission or absorption

Of fluent material

C356S246000

Reexamination Certificate

active

07542143

ABSTRACT:
A flow cell for measuring the color properties of a liquid flowing therethrough using interrogating radiation at a predetermined wavelength has a thin partition mounted in spaced relationship between both a window and a base of the cell. The partition and the window define an air cavity therebetween. The spacing between the partition and the window is such that evanescent coupling of radiation reflected from the liquid into the material of the window is prevented.The cell has a pressurized fluid inflow channel and a pressurized fluid outflow channel formed therein. Each of the inflow and outflow channels communicates with the air cavity. The inflow and outflow channels are sized to pass a pressurized fluid, such as pressurized air, through the air cavity such that, in use, the spaced relationship between the partition and the window is maintained by pressurized fluid in the air cavity. The pressure of the pressurized fluid in the air cavity is determined in accordance with the pressure of the liquid flowing through the cell.

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