Miniature Sensors for Biological Warfare Agents using Fatty Acid ...

was as follows: t=0 scan start, t= 1 min. flow on, t= 1min 10 sec. fire
micropyrolyzer, and t= 1 min. 15 sec. micropyrolyzer off. For the C16 FAME tests
presented, the micropyrolyzer test fixture temperature was 90°C.
3.4. Colorado School of Mines (CSM)
The schematic below illustrates the instrumental setup for micropyrolyzer testing at
CSM. The micropyrolyzer housing was supplied by Sandia. Note that the 1.4
meter capillary transfer line goes directly from the test fixture to the inside of the
ion trap mass spectrometer.
micropyrolyzer housing
(chip inside, ~135 oC, ~ 5 psi)
signal out
quadrupole ion trap
detector
vacuum
sample inlet
V rf
e -
V 1/3 rf
Heated coiled
capillary interface
(100 µm id x 1.4m
@ 225 o C)
Figure 19: Schematic of instrumental setup for CSM tests.
44
Compressed
Air
A photo of the instrumentation shows the relative sizes of the components. The
mass spectrometer is a modified Bruker (Billerica, MA) instrument. Not shown are
the vacuum pumps and electronics that operate the mass spectrometer.
Quadrupole
ion trap MS
Figure 20: Photo of CSM instrumentation.
Heated direct capillary interface
(100 mm id x 1.4 m, 225 o C)
micropyrolyzer
fixture