Page 6 - Shimadzu IRAffinity-1S

Easier Maintenance

Ease of Maintenance Ensured by Built-in Auto Dryer
(JPN registration of utility model No. 3116465)

Beam splitters in the interferometers of FTIR instruments are susceptible to humidity. In order to
maintain the long-term stability of the interferometer, the beam splitter must be protected.
In the IRAf nity-1S, the interferometer is airtight and incorporates a unique internal auto dryer.

Measures Taken to Protect the Optical
Element in the Interferometer

• The interferometer has an airtight structure.
• Moisture inside the interferometer is continuously removed by an
auto dryer.
• The beam splitter is coated with a moisture-resistant protective lm.

H H
Principle of the Auto Dryer H H
O O
H H H H H H
The IRAf nity-1S incorporates an auto dryer that electrolytically O O
removes the moisture inside the interferometer using a solid polymer H H H H
electrolyte membrane. O O
H H

• When porous electrodes are attached to a solid polymer electrolyte dehumidifying Moisture decomposed
membrane and direct current is applied, moisture on the anode side
(i.e., the desiccation side) dissociates into hydrogen ions and oxygen.
H H
• The hydrogen ions travel through the solid polymer electrolyte O O
membrane and reach the cathode side (i.e., the moisture discharge H H
side).
H H
• At the cathode, the hydrogen ions react with oxygen in the air to O O
form (gaseous) water vapor, which is released outside the inside of H H
interferometer. interferometer

Anode (desiccation side)

+ 2 + + + 2 + H −

Cathode (moisture discharge side)

+ + 2 + H − + 2
+

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