The Pearl, Liquid Transmission Accessory

Infrared spectroscopy of some liquids is best accomplished in transmission mode, where the whole sample is exposed to the path of the infrared beam. The advantages over ATR include higher sensitivity and accurate determination of pathlength – essential for accurate quantitation. 

Traditional liquid transmission cells are simple in construction, consisting of no more than two IR transmitting windows and a thin spacer clamped together with backing plates. Although simple by design, their use can be complicated by viscous samples which may stick or apply unevenly to the windows.

These same samples are also difficult to introduce and clean from a cell, requiring careful reassembly after each sample. This makes accurate and repeatable control of the pathlength near impossible.

The Pearl™ liquid transmission accessory holds the innovative horizontally mounted Oyster™ cell, consisting of two precision machined window holders which match to provide a highly repeatable pathlength without the use of spacers.