In situ analysis apparatus

摘要

A gas analysis apparatus includes an optical source for providing an optical signal, an interferometer for modifying the optical signal, and an optical signal detector. A first housing having folded path optical elements positioned therein; the elements defining a sample path through which the optical signal passes from the interferometer to the optical signal detector. The first housing has a sample introduction opening. A second housing defines a sample holding volume. The second housing is sealingly positioned with respect to the first housing for fluidly connecting the sample path of the first housing with the sample holding volume of the second housing through the sample introduction opening. A recirculating flow may be provided between the sample path and the sample holding volume. The second housing may include an access port with a detachable access closure through which a material may be placed in the sample holding volume. A method for using the apparatus is also described.