Page 197 - Chalcogenide Glasses for Infrared Optics

Glass Pr ocesses for Other Applications 173

Isobutylene Polymerization
Peak area vs time for 1590 wn peak
0.6

0.5

Peak area 0.4
0.3

0.2
0.1

0
0 10 20 30 40 50 60 70 80
Time (min)
FIGURE 7.15 Remspec multi-FTIR probe results of the study of the
polymerization of isobutylene.

Their efforts were concentrated mostly on chemical analysis of haz-
ardous waste in containers. As their work progressed, the group was
taken over by the MIDAC Corporation and renamed Sensiv. They
developed a barrel “dip probe” for direct sampling of 55-gal drums.
Also a portable fiber-optic automated measurement system for field
use was developed. Measurements identified benzene, methylene
chloride, methyl ethyl ketone, TCE, and toluene in field tests. A por-
table surface reflectance probe was developed for field use.
Infrared energy from a glow bar is collected with optics and
directed to a surface. The reflected light is collected and directed
into an IR fiber connected to a FTIR for analysis. Figure 7.16 shows
the curing of a urethane paint measured by the Sensiv reflectance
probe.

7.3.1 Fiber Summary
The sealed chamber extrusion-pull method developed at AMI for
producing optical fibers from chalcogenide glasses has proved to be
very reproducible. Continuous draws of 100 m or more are easily
achieved depending on the fiber core diameter. The split-die methods
developed for glass cladding and plastic coating during the draw
process have been very successful. C1 fiber will transmit small
amounts (< 5 W) of CO and CO CW laser light.
2
The broadband As-Se-Te glass C1 fibers are flexible and have low
attenuation of 2 to 11 µm. The C2 fibers based on As S glass cover the
2 3
range from the visible to 8 µm and offer the potential of delivering