This disclosure provides systems, methods, and apparatus related to infrared spectroscopy.
In one aspect, a device includes a first assembly, a porous membrane, and a second
assembly. The first assembly defines a fluid distributor. The porous membrane overlies the
fluid distributor and forms a surface of the fluid distributor. The second assembly is disposed
on the first assembly. The second assembly defines a plurality of capillary arrays
surrounding a window in the second assembly that exposes the porous membrane …